AC drive, importance of AC drive, different methods of control speed of induction motor and synchonous motor, variable frequency converter, speed control by varying frequency and voltage of stator.
An AC drive is a device used to control the speed of an electrical motor. The speed is controlled by changing the frequency of the electrical supply to the motor.
An AC drive is a device used to control the speed of an electrical motor. The speed is controlled by changing the frequency of the electrical supply to the motor.
Everywhere DC motors are used in large applications, the use of drives are very necessary for the smooth running and operating of these motors. The DC motor drives are used mainly for good speed regulation, frequent starting, braking and reversing.
Content:
Introduction to Stepper Motors
Types of Stepper Motors
Main components of a stepper motor
How do these components work together
Control sequence to turn a stepper motor
Advantages and disadvantages of stepper motors
Practical Applications of stepper motor
Step Angle
Summary
For more information Email us:
Engineeringgaragevir@gmail.com
Regards;
xubair khan
Electrical AC & DC Drives in Control of Electrical DrivesHardik Ranipa
content
Introduction:
ELECTRIC DRIVES - A DEFINITION
Block diagram of Electrical drive:
Components in electric drives
DC drives classification in various types
Single-Phase Half-Wave-Converter Drives:
Three-phase drives
Ac motor drives
Introduction: AC Motor Drives
Stator Voltage Control:
Rotor Voltage Control:
Frequency Control:
DC DRIVES Vs AC DRIVES
Conclusion:
Thank u......
Everywhere DC motors are used in large applications, the use of drives are very necessary for the smooth running and operating of these motors. The DC motor drives are used mainly for good speed regulation, frequent starting, braking and reversing.
Content:
Introduction to Stepper Motors
Types of Stepper Motors
Main components of a stepper motor
How do these components work together
Control sequence to turn a stepper motor
Advantages and disadvantages of stepper motors
Practical Applications of stepper motor
Step Angle
Summary
For more information Email us:
Engineeringgaragevir@gmail.com
Regards;
xubair khan
Electrical AC & DC Drives in Control of Electrical DrivesHardik Ranipa
content
Introduction:
ELECTRIC DRIVES - A DEFINITION
Block diagram of Electrical drive:
Components in electric drives
DC drives classification in various types
Single-Phase Half-Wave-Converter Drives:
Three-phase drives
Ac motor drives
Introduction: AC Motor Drives
Stator Voltage Control:
Rotor Voltage Control:
Frequency Control:
DC DRIVES Vs AC DRIVES
Conclusion:
Thank u......
It contains overview of thermal power plant with single line diagram.
Next motors used in power plants and starters of various types.
After, All the necessary information about Variable Frequency Drive with Diagrams which will assist in understanding easily and more convenient way.
A variable-frequency drive (VFD) or adjustable-frequency drive (AFD), variable-voltage/variable-frequency (VVVF) drive, variable speed drive (VSD), AC drive, micro drive or inverter drive is a type of adjustable-speed drive used in electro-mechanical drive systems to control AC motor speed and torque by varying motor input frequency and voltage.
Speed Control of Induction Motor using Variable Frequency DriveSandeep Kaushal
Induction motor is constant speed motor at a particular frequency and consumes almost same power irrespective of load demand. Let's talk about two different load one is high load and other low load. AT low load motor is delivering the load with some current and thereby torque is maintained. If load goes high, to maintain the same speed and developed torqued, motor will draw extra current and will corresponds to more losses. If speed of motor is reduced corresponding too low load and is increased corresponding to high load, then substantial amount of power can be saved. And speed can be changed by changing the frequency of input supply.
Electrical drives are integral part of industrial and automation processes, particularly where precise control of speed of the motor is the prime requirement. In addition, all modern electric trains or locomotive systems have been powered by electrical drives. Robotics is another major area where adjustable speed drives offer precise speed and position control.
Robotics deals with the design, construction, operation, and use of robots, as well as computer systems for their control, sensory feedback, and information processing. These technologies are used to develop machines that can substitute for humans and replicate human actions
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Instructions for Submissions thorugh G- Classroom.pptxJheel Barad
This presentation provides a briefing on how to upload submissions and documents in Google Classroom. It was prepared as part of an orientation for new Sainik School in-service teacher trainees. As a training officer, my goal is to ensure that you are comfortable and proficient with this essential tool for managing assignments and fostering student engagement.
Ethnobotany and Ethnopharmacology:
Ethnobotany in herbal drug evaluation,
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2. Content
• Induction
• Induction Motor Drive and its Classification
• Pump Application with adjustable flow
rate.
• Per phase representation of IM
• Torque speed characteristic of IM
• PWM VSI
2
3. 3
AC Drive
An AC Drive is a device used to control the speed of an
electrical Motor in Order to:
• Enhance Process Control
• Reduce energy usage and generate energy efficiently.
• Decrease Mechanical Stress on Motor Control
Application.
• Optimize the operation of various application relaying
on electric motors.
5. 5
Induction Motor Drive Classification based on Application
• Adjustable – Speed Drive – One important
application of these devices is in process control
by controlling the speed of fans, compressors,
Pumps,blowers etc
• Servo Drives- By Means of sophisticated
control, induction motors can be used as servo
drives in Computer peripherals, machine tools,
and robotics.
7. 14-7
Per-Phase Representation
(assuming sinusoidal steady state)
Because of the shunt inductance term, we must reduce the
applied voltage magnitude in proportion to applied frequency
to avoid serious saturation of the iron near the air gap
This is what is called “Constant Volts per Hertz Operation,” which is
the standard operating mode for ASDs
13. 14-13
Disadvantage of Stator Voltage
Control
• Disadvantage of this Method is that the smooth
speed control is not possible.
• This Method is more costly and less efficient
as two different stator.
14. 14-14
Variable-Frequency converter
/Drive
• Ability to adjust the Frequency according to the
desired output speed.
• Ability to adjust the output voltage so as to maintain
a constant air gap flux in the constant- torque
region.
• Ability to supply a rated current on a continuous
basis at any frequency.
19. 16-19
Improving Energy Efficiency of Heat Pumps
• Used in one out of three new homes in the U.S.
How does inserting an ASD save energy in single-phase applications?
Some losses
But a three-phase motor is 95%
efficient, compared to 80%
efficiency for a single-phase motor
20. 16-20
Loss Associated with ON/OFF Cycling
• The system efficiency is improved by ~30 percent
The big efficiency gain is here
• with conventional air conditioners, the first few minutes
after start-up are very inefficient as the mechanical
system reaches steady-state
• with ASDs, the air conditioner speed is lowered with
demand, so that there are fewer start-ups each day
22. 18-22
Power-Factor-Correction (PFC) Circuit
The boost converter is operated to
make the DBR current look
sinusoidal on the AC side
To be sold in Europe, this is a
necessary feature in high-current
single-phase power electronic loads
It also permits more power to be
drawn from conventional wall
outlets because the harmonic
currents are minimal
23. 18-23
Power-Factor-Correction (PFC) Circuit
• Operation during each half-cycle
The boost converter is instructed to
“close” when the current is below the
sinewave envelope, and
“open” with the current is above the
sinewave envelope
close
open
24. 18-24
Power Electronics Has Made Wind Farms
Possible
The choices used to be
• Use an efficient induction generator, which has very poor
power factor, or
• Use a synchronous generator, but constantly fight to
synchronize the turbine speed with the grid.
Now,
• Either use a DC bus and inverter to decouple the generator and
grid AC busses, or
• Use a doubly-fed induction motor, operate the wind turbine at
the max power speed, and use power electronics to “trick” the
wind generator into producing grid-frequency output. This is
what you see in West Texas.
25. 18-25
TYPE OF SYNCHRONOUS MOTOR
DRIVE
Based on Nature of voltage induced in the stator
classified as
Sinusoidally excited Synchronous Motor
• Stator has distributed winding.
• Stator induced voltage has sinusoidal waveform.
Trapezoidally excited Synchronous Motor
• Stator has Concentrated Winding.
• Stator induced voltage has trapezoidal waveform.
27. 18-27
Speed Control by Trapezoidal Waveform
• According to the torque equation torque is
proportional to Id.
• Regenerative braking mode operation is
obtained by reversing phase currents.
• This will also reverse the source current
Id.
• Now power flow from the Machine to
inverter and from inverter to dc source.
28. 18-28
References
• Power Electronics Converter,
Applications,and Design by Ned Mohan
• Electrical Acedimia
• Power Electronics Devices, Circuit, and
Industrial Applications. By V.R MOORTHI