Speed control of dc motors
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The document discusses several methods for controlling the speed of DC motors, including: 1) Armature resistance control, where increasing armature resistance decreases current and speed. 2) Field flux control, where decreasing flux through the field coils increases speed. 3) Field and armature divertor controls, where diverting current away decreases flux and increases speed. 4) Tapped field and paralleling field controls change the motor's flux through different field coil configurations to vary speed. 5) The Ward Leonard control system uses an AC or DC motor to drive a generator coupled to the motor being controlled, allowing very smooth speed variation.
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Speed control of dc motor
This document discusses various speed control methods for DC motors. It summarizes that the speed of a DC motor is directly proportional to the back EMF and inversely proportional to flux. For shunt motors, speed can be controlled through flux control by adding resistance to the field winding, armature control by adding resistance in series to the armature, and voltage control by varying the supply voltage. For series motors, speed is controlled through flux control methods like field and armature diversion, tapped fields, and paralleled fields as well as adding resistance in series with the armature. Series-parallel control is also described for variable speed applications.
Speed control of dc motors
This document discusses speed control methods for DC motors. It begins by explaining that DC motors can achieve fine speed control through simple methods, which is their main advantage over AC motors. It then describes the three main speed control methods for DC motors as varying the flux, armature resistance, or applied voltage. Subsequent sections provide more details on speed control for shunt motors and series motors, including flux control, armature control, voltage control, and numerical examples. The document is intended to teach speed control of DC motors through lecture notes.
Speed Control Of DC Motor
DC machines can achieve wide range speed control through three main methods - armature resistance control to vary speed below base speed, field flux control to vary speed above base speed, and armature voltage control using systems like Ward-Leonard which combine armature and field control to achieve the widest speed range from below to above base speed. Controlled rectifiers and series-parallel configurations are also used to vary armature voltage for smooth speed regulation.
Speed controlling method of dc motor
This document discusses three main methods of controlling the speed of a DC motor: flux control, armature control, and voltage control.
Flux control varies the motor's flux by adjusting the field current, allowing speeds above rated speed. However, it only works above rated speed and has a maximum speed limit. Armature control varies the motor's speed by adjusting the armature circuit resistance, permitting speeds below rated only. It wastes a large amount of power and has poor regulation. Voltage control involves adjusting the applied voltage using various methods like Ward-Leonard drives when the power source is AC or chopper control when it is DC.
Speed control of dc motors
The document discusses speed control methods for DC motors. It describes various types of speed control for DC series and shunt motors, including flux control, armature voltage control, potential divider control, and applied voltage control. It also discusses the Ward-Leonard system of speed control, which uses a motor-generator set to provide smooth and rapid variable speed control and is commonly used for elevators and industrial machinery. The document outlines advantages like smooth wide range speed variation but also disadvantages like low efficiency and high initial cost.
Ward leonard method of speed control
Ward Leonard Control, also known as the Ward Leonard Drive System, was a widely used DC motor speed control system introduced by Harry Ward Leonard in 1891. In early 1900s, the control system of Ward Leonard was adopted by the U.S. Navy and also used in passenger lift of large mines.
methods to control speed of dc motors
this ppt is made by me (harshid panchal),
guided by prof : Hitesh Manani,
we are from electrical engineering at gandhinagar institute of technology
https://harshidpanchalhp.wordpress.com/
harshidpanchalhp@gmail.com
Speed control Of DC Machines
The document discusses three methods for controlling the speed of a DC motor: 1) varying the armature circuit resistance, 2) varying the field flux, and 3) varying the terminal voltage using the Ward-Leonard method. It provides details on how each method works, including equations showing how speed is affected. The Ward-Leonard method uses a motor-generator set to convert AC power to DC power at a controlled voltage to regulate motor speed. Advantages and disadvantages of each method are also summarized.
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Speed control of dc motor
This document discusses various speed control methods for DC motors. It summarizes that the speed of a DC motor is directly proportional to the back EMF and inversely proportional to flux. For shunt motors, speed can be controlled through flux control by adding resistance to the field winding, armature control by adding resistance in series to the armature, and voltage control by varying the supply voltage. For series motors, speed is controlled through flux control methods like field and armature diversion, tapped fields, and paralleled fields as well as adding resistance in series with the armature. Series-parallel control is also described for variable speed applications.
Speed control of dc motors
This document discusses speed control methods for DC motors. It begins by explaining that DC motors can achieve fine speed control through simple methods, which is their main advantage over AC motors. It then describes the three main speed control methods for DC motors as varying the flux, armature resistance, or applied voltage. Subsequent sections provide more details on speed control for shunt motors and series motors, including flux control, armature control, voltage control, and numerical examples. The document is intended to teach speed control of DC motors through lecture notes.
Speed Control Of DC Motor
DC machines can achieve wide range speed control through three main methods - armature resistance control to vary speed below base speed, field flux control to vary speed above base speed, and armature voltage control using systems like Ward-Leonard which combine armature and field control to achieve the widest speed range from below to above base speed. Controlled rectifiers and series-parallel configurations are also used to vary armature voltage for smooth speed regulation.
Speed controlling method of dc motor
This document discusses three main methods of controlling the speed of a DC motor: flux control, armature control, and voltage control.
Flux control varies the motor's flux by adjusting the field current, allowing speeds above rated speed. However, it only works above rated speed and has a maximum speed limit. Armature control varies the motor's speed by adjusting the armature circuit resistance, permitting speeds below rated only. It wastes a large amount of power and has poor regulation. Voltage control involves adjusting the applied voltage using various methods like Ward-Leonard drives when the power source is AC or chopper control when it is DC.
Speed control of dc motors
The document discusses speed control methods for DC motors. It describes various types of speed control for DC series and shunt motors, including flux control, armature voltage control, potential divider control, and applied voltage control. It also discusses the Ward-Leonard system of speed control, which uses a motor-generator set to provide smooth and rapid variable speed control and is commonly used for elevators and industrial machinery. The document outlines advantages like smooth wide range speed variation but also disadvantages like low efficiency and high initial cost.
Ward leonard method of speed control
Ward Leonard Control, also known as the Ward Leonard Drive System, was a widely used DC motor speed control system introduced by Harry Ward Leonard in 1891. In early 1900s, the control system of Ward Leonard was adopted by the U.S. Navy and also used in passenger lift of large mines.
methods to control speed of dc motors
this ppt is made by me (harshid panchal),
guided by prof : Hitesh Manani,
we are from electrical engineering at gandhinagar institute of technology
https://harshidpanchalhp.wordpress.com/
harshidpanchalhp@gmail.com
Speed control Of DC Machines
The document discusses three methods for controlling the speed of a DC motor: 1) varying the armature circuit resistance, 2) varying the field flux, and 3) varying the terminal voltage using the Ward-Leonard method. It provides details on how each method works, including equations showing how speed is affected. The Ward-Leonard method uses a motor-generator set to convert AC power to DC power at a controlled voltage to regulate motor speed. Advantages and disadvantages of each method are also summarized.
Speed control of DC motor
This document discusses various methods for controlling the speed of DC motors, including shunt motors and series motors. It provides the governing equations for DC motor speed in terms of flux and back EMF. For shunt motors, it describes flux control, armature control, and voltage control methods. Flux control varies field current, armature control adds resistance in the armature circuit, and voltage control varies the applied voltage. For series motors, it discusses flux control using field and armature divertors, tapped fields, parallel fields, and adding variable resistance in the armature circuit. The document also briefly describes Ward-Leonard speed control systems.
Ward leonard method & Characteristics of series motor
The Ward Leonard system is a method of speed control for DC motors that uses a motor-generator set. It provides combined armature and field control. The speed of the first DC motor is controlled by varying the output voltage of the generator it drives. The generator voltage is controlled using a field regulator. This system allows for smooth starting and reversal of the first motor. While costly, it provides efficient speed control without needing external resistors. Common applications include cranes, elevators, and mills. The characteristics of series motors are also discussed, noting their torque and speed variations with armature current.
Automatic speed control of DC motor
In this presentation, basic study of Control of DC motor , study of MATLAB/Simulink, Simulation of entitled project and problem associate with dc motor.
This presentation has been submitted to Mr.Anurag Agrawal and submitted by Munesh Singh, Anitya Shukla, Devendra Kumar and Aditya Vikram Singh in May 2012 to Kanpur institute of Technology,Kanpur India.
Unit iv conventional and solid state speed control of dc motors
This document discusses speed control methods for DC motors, including conventional and solid state control. It describes various speed control techniques for shunt motors and series motors such as flux control, armature voltage control, and the Ward-Leonard system. For solid state control, it covers phase-controlled rectifier drives and chopper drives. Phase-controlled rectifier drives can use single-phase or three-phase configurations while providing benefits like faster response and higher efficiency over conventional methods.
Unit iii ROTOR CONTROLLED AC DRIVES,ME PED,
This document discusses various rotor control techniques for induction motors, including:
1) Static rotor resistance control, which is simple but inefficient as slip power is wasted in rotor resistance.
2) Slip power recovery schemes like static Kramer and Scherbius drives that convert slip power to AC line power to improve efficiency.
3) Injection of voltage in the rotor circuit using a Schrage motor to produce an EMF that is injected at slip frequency to control speed.
The document provides details on operating principles, equivalent circuits, torque expressions, and power factor considerations for different rotor control induction motor drives.
Variabe voltage and variable frequency drives
This document discusses variable voltage and variable frequency drives (VVVFD). It begins with an introduction that defines a VVVFD as a system that controls the rotational speed of an AC motor by controlling the frequency of the electrical power supplied. It then discusses operating principles such as how motor speed is determined by supply frequency. The document also describes the components of a VVVFD system including the controller and operation, noting it initially applies low frequency and voltage to avoid high inrush current. In conclusion, it states AC drives like VVVFDs are replacing DC motors in some applications due to advantages like automatic control.
Control of dc drives
This document summarizes control of DC drives. It discusses types of DC motor configurations including series and separately excited motors. It describes single phase and three phase DC drives that use converters depending on the supply available. Chopper drives are discussed as a way to control DC motor speed by adjusting the duty cycle and switching frequency of the chopper output voltage. Phase locked loop control of DC drives is also mentioned as a way to precisely control motor speed by synchronizing the motor speed pulses to a reference frequency pulse train. Applications of DC drives include rolling mills, paper mills, printing presses, mine winders and machine tools.
Slip power recovery schemes EDC
PRESENTATION BY Mr.S.DAISON STALLON AP/EEE NEHRU INSTITUTE OF ENGINEERING AND TECHNOLOGY COIMBATORE.9489745477
Speed control of dc motor
The document discusses speed control methods for DC motors. It explains that the speed of a DC motor is directly proportional to the back EMF and inversely proportional to flux. For shunt motors, speed can be controlled through flux control by adding resistance in the field winding, or through armature control by adding resistance in series with the armature. For series motors, speed is controlled through flux control using field or armature diverters or tapped field control, or through armature resistance control. Ward-Leonard control provides sensitive speed control for applications like elevators.
Vector control of induction motor
This document provides an overview of vector control of AC induction motors compared to scalar control. Vector control decouples the torque and flux produced by the motor, allowing for more precise independent control. It does this by controlling the direct current (Id) that produces flux and quadrature current (Iq) that produces torque. There are two approaches to vector control - direct field oriented control that directly measures the rotor angle and indirect field oriented control that indirectly measures it using slip speed. Key benefits of vector control are fast transient response since torque can be controlled without affecting flux, and ability to control speed in all four quadrants.
Vector Control of AC Induction Motors
Vector control is a more advanced and precise method of controlling AC induction motors compared to scalar control. It involves transforming the motor currents and voltages into a rotating reference frame to obtain decoupled control similar to a DC motor. This allows for independent control of flux and torque for faster dynamic response and better performance than scalar control. The basic implementation of vector control uses Clarke and Park transformations to convert between stationary and rotating reference frames in the controller. It provides DC motor-like precision in speed and torque control of induction motors.
Rotor Resistance Control and Slip Power Control using Chopper
Rotor Resistance Control and Slip Power Control using Chopper
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KAUSHAL BOGHNAI
This document discusses slip power recovery in induction motors using static Kramer and Scherbius drives. It provides details on:
1. The conventional Kramer system controls motor speed by injecting a voltage into the rotor circuit at the slip frequency. This allows increasing or decreasing the rotor resistance to control speed.
2. Static Kramer drives only allow sub-synchronous operation while Static Scherbius drives allow both above and below synchronous speeds.
3. Scherbius drives enable bi-directional power flow using positive and negative injected voltages phase with or opposing the rotor current, allowing a wider range of operating conditions than Kramer drives.
1.general block diagram
This course covers electric drive systems controlled by power electronic converters. It discusses DC drives, induction motor drives controlled from the stator side and rotor side, and synchronous motor drives. Students will learn about drive characteristics and modeling, DC drive configurations, closed-loop control of induction motors, efficient speed control methods for induction motors, and control techniques for synchronous motors. The course aims to provide an understanding of electric drive performance and applications in various industries.
Vector control of induction motor
Vector control of AC induction motors provides superior dynamic performance compared to scalar control by decoupling torque and flux control. Vector control represents the stator currents as direct and quadrature components (Ids and Iqs) that independently control flux and torque. This allows precise and independent control of torque and flux to eliminate oscillations for applications requiring high performance like robotics. Vector control implementations determine the orientation of Ids and Iqs either directly by measuring airgap flux or indirectly by measuring slip speed to achieve independent control of the current components.
Unit v conventional and solid state speed control of ac drives
This document discusses various methods for controlling the speed of AC induction motors, including stator-side control by varying voltage or frequency, and rotor-side control using cascade control, adding rotor resistance, or slip power recovery schemes. Stator-side control involves changing the stator voltage using autotransformers or resistors, or changing the frequency which varies the synchronous speed. Rotor-side control techniques include cascade control using two motors, adding external resistance in the rotor circuit, or recovering slip power using Kramer or Scherbius systems.
Static ward leonard drive
The document discusses different methods of speed control for DC motors using static ward Leonard drive systems. It describes single phase and three phase fully or half controlled rectifier configurations that provide variable DC voltage to the motor, allowing control in one or two quadrants. Low power applications typically use a single phase fully controlled rectifier while high power uses three phase. The systems can operate in continuous or discontinuous conduction modes to control motor speed and torque characteristics.
Ac drive basics
This document discusses AC drive basics, including why AC drives are used, common terminology, main components like the rectifier and inverter, control methods like V/F and vector control, power wiring considerations, and filters that can be used. It also briefly mentions programming AC drives and provides tips and tricks.
Closed loop speed control
DC motor and open loop speed control.
Closed loop speed control of DC drives.
Closed loop speed control with inner loop current control
Closed loop field control
Closed loop armature control.
Speed control methods of motor
This document discusses various speed control methods for DC shunt motors and series motors. For shunt motors, it describes flux control, armature control, and voltage control methods. For series motors, it discusses flux control using a field diverter or armature diverter, and armature resistance control. It also explains regenerative, rheostatic, plugging, and stator voltage control methods for braking DC motors. Stator voltage control is described as a method for controlling the speed of induction motors by varying the thyristor firing angle.
braking.ppt
The document discusses DC motor starters, breaking methods, and speed control. It describes how starting resistors are used to limit excess starting currents in DC motors. Ward-Leonard and solid-state speed control systems are introduced that vary the motor's armature voltage to control speed. Three methods of electric braking for DC motors are covered: rheostatic, plugging, and regenerative braking.
Mech EE6365 EE lab_manual
This document provides information about different types of DC motor starters and AC motor starters. It discusses two point, three point, and four point starters for DC motors. It explains how each type protects the motor from high starting currents and overloads. It also covers various AC motor starting methods like auto transformer starting, star-delta starting, and direct online starting. Star-delta and auto transformer starting reduce the starting current by initially applying a lower voltage to the motor. Direct online starting applies full voltage but is only suitable for small motors due to the large starting currents involved.
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What's hot
Speed control of DC motor
This document discusses various methods for controlling the speed of DC motors, including shunt motors and series motors. It provides the governing equations for DC motor speed in terms of flux and back EMF. For shunt motors, it describes flux control, armature control, and voltage control methods. Flux control varies field current, armature control adds resistance in the armature circuit, and voltage control varies the applied voltage. For series motors, it discusses flux control using field and armature divertors, tapped fields, parallel fields, and adding variable resistance in the armature circuit. The document also briefly describes Ward-Leonard speed control systems.
Ward leonard method & Characteristics of series motor
The Ward Leonard system is a method of speed control for DC motors that uses a motor-generator set. It provides combined armature and field control. The speed of the first DC motor is controlled by varying the output voltage of the generator it drives. The generator voltage is controlled using a field regulator. This system allows for smooth starting and reversal of the first motor. While costly, it provides efficient speed control without needing external resistors. Common applications include cranes, elevators, and mills. The characteristics of series motors are also discussed, noting their torque and speed variations with armature current.
Automatic speed control of DC motor
In this presentation, basic study of Control of DC motor , study of MATLAB/Simulink, Simulation of entitled project and problem associate with dc motor.
This presentation has been submitted to Mr.Anurag Agrawal and submitted by Munesh Singh, Anitya Shukla, Devendra Kumar and Aditya Vikram Singh in May 2012 to Kanpur institute of Technology,Kanpur India.
Unit iv conventional and solid state speed control of dc motors
This document discusses speed control methods for DC motors, including conventional and solid state control. It describes various speed control techniques for shunt motors and series motors such as flux control, armature voltage control, and the Ward-Leonard system. For solid state control, it covers phase-controlled rectifier drives and chopper drives. Phase-controlled rectifier drives can use single-phase or three-phase configurations while providing benefits like faster response and higher efficiency over conventional methods.
Unit iii ROTOR CONTROLLED AC DRIVES,ME PED,
This document discusses various rotor control techniques for induction motors, including:
1) Static rotor resistance control, which is simple but inefficient as slip power is wasted in rotor resistance.
2) Slip power recovery schemes like static Kramer and Scherbius drives that convert slip power to AC line power to improve efficiency.
3) Injection of voltage in the rotor circuit using a Schrage motor to produce an EMF that is injected at slip frequency to control speed.
The document provides details on operating principles, equivalent circuits, torque expressions, and power factor considerations for different rotor control induction motor drives.
Variabe voltage and variable frequency drives
This document discusses variable voltage and variable frequency drives (VVVFD). It begins with an introduction that defines a VVVFD as a system that controls the rotational speed of an AC motor by controlling the frequency of the electrical power supplied. It then discusses operating principles such as how motor speed is determined by supply frequency. The document also describes the components of a VVVFD system including the controller and operation, noting it initially applies low frequency and voltage to avoid high inrush current. In conclusion, it states AC drives like VVVFDs are replacing DC motors in some applications due to advantages like automatic control.
Control of dc drives
This document summarizes control of DC drives. It discusses types of DC motor configurations including series and separately excited motors. It describes single phase and three phase DC drives that use converters depending on the supply available. Chopper drives are discussed as a way to control DC motor speed by adjusting the duty cycle and switching frequency of the chopper output voltage. Phase locked loop control of DC drives is also mentioned as a way to precisely control motor speed by synchronizing the motor speed pulses to a reference frequency pulse train. Applications of DC drives include rolling mills, paper mills, printing presses, mine winders and machine tools.
Slip power recovery schemes EDC
PRESENTATION BY Mr.S.DAISON STALLON AP/EEE NEHRU INSTITUTE OF ENGINEERING AND TECHNOLOGY COIMBATORE.9489745477
Speed control of dc motor
The document discusses speed control methods for DC motors. It explains that the speed of a DC motor is directly proportional to the back EMF and inversely proportional to flux. For shunt motors, speed can be controlled through flux control by adding resistance in the field winding, or through armature control by adding resistance in series with the armature. For series motors, speed is controlled through flux control using field or armature diverters or tapped field control, or through armature resistance control. Ward-Leonard control provides sensitive speed control for applications like elevators.
Vector control of induction motor
This document provides an overview of vector control of AC induction motors compared to scalar control. Vector control decouples the torque and flux produced by the motor, allowing for more precise independent control. It does this by controlling the direct current (Id) that produces flux and quadrature current (Iq) that produces torque. There are two approaches to vector control - direct field oriented control that directly measures the rotor angle and indirect field oriented control that indirectly measures it using slip speed. Key benefits of vector control are fast transient response since torque can be controlled without affecting flux, and ability to control speed in all four quadrants.
Vector Control of AC Induction Motors
Vector control is a more advanced and precise method of controlling AC induction motors compared to scalar control. It involves transforming the motor currents and voltages into a rotating reference frame to obtain decoupled control similar to a DC motor. This allows for independent control of flux and torque for faster dynamic response and better performance than scalar control. The basic implementation of vector control uses Clarke and Park transformations to convert between stationary and rotating reference frames in the controller. It provides DC motor-like precision in speed and torque control of induction motors.
Rotor Resistance Control and Slip Power Control using Chopper
Rotor Resistance Control and Slip Power Control using Chopper
Closed Loop Control of Induction Motor
KAUSHAL BOGHNAI
This document discusses slip power recovery in induction motors using static Kramer and Scherbius drives. It provides details on:
1. The conventional Kramer system controls motor speed by injecting a voltage into the rotor circuit at the slip frequency. This allows increasing or decreasing the rotor resistance to control speed.
2. Static Kramer drives only allow sub-synchronous operation while Static Scherbius drives allow both above and below synchronous speeds.
3. Scherbius drives enable bi-directional power flow using positive and negative injected voltages phase with or opposing the rotor current, allowing a wider range of operating conditions than Kramer drives.
1.general block diagram
This course covers electric drive systems controlled by power electronic converters. It discusses DC drives, induction motor drives controlled from the stator side and rotor side, and synchronous motor drives. Students will learn about drive characteristics and modeling, DC drive configurations, closed-loop control of induction motors, efficient speed control methods for induction motors, and control techniques for synchronous motors. The course aims to provide an understanding of electric drive performance and applications in various industries.
Vector control of induction motor
Vector control of AC induction motors provides superior dynamic performance compared to scalar control by decoupling torque and flux control. Vector control represents the stator currents as direct and quadrature components (Ids and Iqs) that independently control flux and torque. This allows precise and independent control of torque and flux to eliminate oscillations for applications requiring high performance like robotics. Vector control implementations determine the orientation of Ids and Iqs either directly by measuring airgap flux or indirectly by measuring slip speed to achieve independent control of the current components.
Unit v conventional and solid state speed control of ac drives
This document discusses various methods for controlling the speed of AC induction motors, including stator-side control by varying voltage or frequency, and rotor-side control using cascade control, adding rotor resistance, or slip power recovery schemes. Stator-side control involves changing the stator voltage using autotransformers or resistors, or changing the frequency which varies the synchronous speed. Rotor-side control techniques include cascade control using two motors, adding external resistance in the rotor circuit, or recovering slip power using Kramer or Scherbius systems.
Static ward leonard drive
The document discusses different methods of speed control for DC motors using static ward Leonard drive systems. It describes single phase and three phase fully or half controlled rectifier configurations that provide variable DC voltage to the motor, allowing control in one or two quadrants. Low power applications typically use a single phase fully controlled rectifier while high power uses three phase. The systems can operate in continuous or discontinuous conduction modes to control motor speed and torque characteristics.
Ac drive basics
This document discusses AC drive basics, including why AC drives are used, common terminology, main components like the rectifier and inverter, control methods like V/F and vector control, power wiring considerations, and filters that can be used. It also briefly mentions programming AC drives and provides tips and tricks.
Closed loop speed control
DC motor and open loop speed control.
Closed loop speed control of DC drives.
Closed loop speed control with inner loop current control
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Closed loop armature control.
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Similar to Speed control of dc motors
Speed control methods of motor
This document discusses various speed control methods for DC shunt motors and series motors. For shunt motors, it describes flux control, armature control, and voltage control methods. For series motors, it discusses flux control using a field diverter or armature diverter, and armature resistance control. It also explains regenerative, rheostatic, plugging, and stator voltage control methods for braking DC motors. Stator voltage control is described as a method for controlling the speed of induction motors by varying the thyristor firing angle.
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This document provides information about different types of DC motor starters and AC motor starters. It discusses two point, three point, and four point starters for DC motors. It explains how each type protects the motor from high starting currents and overloads. It also covers various AC motor starting methods like auto transformer starting, star-delta starting, and direct online starting. Star-delta and auto transformer starting reduce the starting current by initially applying a lower voltage to the motor. Direct online starting applies full voltage but is only suitable for small motors due to the large starting currents involved.
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International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Solid State Drives
This document discusses speed control methods for induction motor drives. It covers stator voltage control, V/F control, rotor resistance control, and vector control. Stator voltage control maintains torque by varying slip and voltage to keep their ratio constant. However, it only allows speed control below the rated speed and higher voltages are inadmissible. V/F control also maintains the torque-slip ratio by varying voltage and frequency proportionally. Rotor resistance control involves adding external resistance to the rotor circuit to control slip and speed. Vector control provides precise speed regulation using sensor feedback. The document provides examples of applications and includes links to learning resources on induction motor principles and different speed control techniques.
Speed Control of DC Motor.pdf
1) There are three main methods for controlling the speed of a DC motor: varying the armature resistance, varying the field flux, or varying the applied voltage.
2) For a shunt motor, speed can be controlled through flux control by adjusting the field current, armature resistance control using a rheostat, or voltage control using multiple voltages or a Ward-Leonard system.
3) For a series motor, speed is controlled through flux control using field divertors, armature divertors, or tapped field control, or by adding a variable resistance in the motor series circuit.
Speed control of Three phase Induction motor using AC voltage regulator
The role of AC Voltage Regulator in speed control of three phase Induction Motor is to vary the supply voltage which in turn, changes the speed of motor .
Simulation of 3-phase matrix converter using space vector modulation
This paper illustrates the simulation of 3-phase matrix converter using Space Vector Modulation (SVM). Variable AC output voltage engendered using matrix converter with bidirectional power switches controlled by appropriate switching pulse. The conventional PWM converter engenders switching common mode voltage across the load system terminals, which cause to common mode current and its leads to bearing failure in load drive. These problems can be rectified using SVM and which minimize the effect on the harmonic fluctuation in AC output voltage and stress on the power switch is reduced using bidirectional switch for proposed 3-phase matrix converter. The simulation results have been presented to validate the proposed system using matlab / simulink.
ELEKTRA_new
The document discusses upgrading an Elektra-Faurandau motor control system by implementing variable frequency drive (VFD) technology. It describes the working principles of the existing Elektra-Faurandau motor and identifies issues with it like commutator sparking and overheating. It proposes replacing the motor with an induction motor for improved efficiency and reliability. Implementing VFD controllers would allow variable speed control of the induction motors while reducing starting current and mitigating issues on the electrical supply network. The document provides details on selecting VFD parameters for different applications like pumps and extruders to optimize performance and protection.
Ijeet 06 08_010
This document discusses vector control of an 8/6 switched reluctance motor (SRM) using a fuzzy logic controller (FLC). It begins with an introduction to SRM and discusses its construction, operating principle, and mathematical model. It then describes the use of direct torque control (DTC) to regulate the motor's torque output within a hysteresis band by controlling stator flux linkage and speed. The document outlines the development of an FLC for SRM speed control, including defining membership functions and fuzzy rules. Simulation results show waveforms for motor torque, speed, and current outputs indicating speed regulation and low torque ripple. The summary concludes the FLC provides accurate SRM control with fast torque/flux response and lower sampling time
Implementation of ac induction motor control using constant vhz principle and...
Abstract
This paper presents the hardware implementation of V/f control of induction motor using sine wave PWM method. Because of its
simplicity, the V/F control also called as the scalar control, is the most widely used speed control method in the industrial
applications. In this method the ratio between stator voltage to frequency is maintained constant so that the stator flux is
maintained constant. As the stator flux is maintained constant, the torque developed by the motor depends only on the slip speed
and is independent of the supply frequency. Thus we can control the speed and torque of induction motor by simply controlling the
slip speed of induction motor. The complete control is achieved with the help of TMS320F28027 Development Board. One of the
basic requirements of this scheme is the PWM inverter. The gating signals are generated using sine wave PWM technique.
Implementation issues such as PWM signal generation, ramp control, v/f control, inverter design are discussed. The results are
discussed based on the various waveforms.
KeyWords: v/f control, Induction motor, PWM, and Scalar control
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Speed control of dc motors
- 1. SPEED CONTROL AND STARTING UNIT 3/ EMD/R SATHEESH KUMAR AP/EEE 1 SNS COLLEGE OF TECHNOLOGY AUTONOMOUS DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING
- 2. ARMATURE RESISTANCE CONTROL UNIT 3/ EMD/R SATHEESH KUMAR AP/EEE 2 Speed of a dc motor is directly proportional to the back emf Eb and Eb = V - IaRa. That means, when supply voltage V and the armature resistance Ra are kept constant, then the speed is directly proportional to armature current Ia.
- 3. FIELD FLUX CONTROL UNIT 3/ EMD/R SATHEESH KUMAR AP/EEE 3 speed of a dc motor is inversely proportional to the flux per pole. Thus by decreasing the flux, speed can be increased and vice versa.
- 4. FIELD DIVERTOR CONTROL UNIT 3/ EMD/R SATHEESH KUMAR AP/EEE 4 This variable resistor is called as a diverter, as the desired amount of current can be diverted through this resistor and, hence, current through field coil can be decreased. Thus, flux can be decreased to the desired amount and speed can be increased.
- 5. ARMATURE DIVERTOR CONTROL UNIT 3/ EMD/R SATHEESH KUMAR AP/EEE 5 For a given constant load torque, if armature current is reduced then the flux must increase, as Ta∝Øia This will result in an increase in current taken from the supply and hence flux Ø will increase and subsequently speed of the motor will decrease.
- 6. TAPPED FIELD CONTROL UNIT 3/ EMD/R SATHEESH KUMAR AP/EEE 6 Field coil is tapped dividing number of turns. Thus we can select different value of Ø by selecting different number of turns.
- 7. PARALLELING FIELD CONTROL UNIT 3/ EMD/R SATHEESH KUMAR AP/EEE 7 In this method, several speeds can be obtained by regrouping coils as shown in fig
- 8. WARD LEONARD CONTROL SYSTEM UNIT 3/ EMD/R SATHEESH KUMAR AP/EEE 8 M2 is the motor to which speed control is required. M1 may be any AC motor or DC motor with constant speed. G is a generator directly coupled to M1. In this method, the output from generator G is fed to the armature of the motor M2 whose speed is to be controlled. The output voltage of generator G can be varied from zero to its maximum value by means of its field regulator and, hence, the armature voltage of the motor M2 is varied very smoothly. Hence, very smooth speed control of the dc motor can be obtained by this method.
- 9. UNIT 3/ EMD/R SATHEESH KUMAR AP/EEE 9