Stepper motor using monoshot
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The document summarizes the working principle of a stepper motor. It describes how a stepper motor converts electrical pulses into discrete mechanical movements by using electromagnetic fields generated by stator electromagnets to rotate the permanent magnet rotor in discrete step increments. It also provides a diagram showing the internal structure of a stepper motor and explains how varying the pulse width controls the rotation speed by changing the resistor values in the circuit that generates the pulses.
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Okay, here are the steps to calculate the transfer function:
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Okay, here are the steps to calculate the transfer function:
1) Write the armature current equation:
Ia(s) = Va(s) / (Ra + sLa)
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Tm(s) = KtIa(s)
3) Write the angular displacement equation:
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Rotating magnetic fields are produced by supplying a three-phase winding with alternating current such that the current in each phase is 120 degrees out of phase. This produces three magnetic fluxes that are 120 degrees out of phase. The vector sum of these three fluxes results in a single magnetic flux vector that rotates in space. This rotating magnetic field can be used to drive an electric motor or generator. The speed of rotation is proportional to the supply frequency and number of poles, such that for a 2-pole winding, the magnetic field rotates at half the frequency of the alternating current supply.
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This document provides an overview of single-phase induction motors. It discusses the construction of single-phase induction motors, which have a two-winding stator arranged perpendicularly and a squirrel cage rotor. It explains that these motors operate based on a double revolving field theory, where the pulsating magnetic field from the main winding can be divided into two fields rotating in opposite directions. A starting winding is used to generate a small positive slip and produce starting torque to initially rotate the motor in the forward direction of one of the fields. An equivalent circuit model is presented to analyze the motor performance based on the two rotating fields.
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3) Early alternators used brushes that caused disadvantages, while later models replaced the permanent magnet with an electromagnet that allows adjustable output voltage.
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Stepper motors
This document provides an overview of stepper motors, including:
- Their working principle is that they rotate through discrete angular steps in response to input current pulses. They come in different types like permanent magnet, variable reluctance, and hybrid.
- Applications include computer peripherals, textile machines, robotics, printers, drives, machine tools, and process controls where incremental motion is required.
- Advantages are low cost, high reliability, and high torque at low speeds. Disadvantages include resonance effects at low speeds and decreasing torque with increasing speed.
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1. A DC motor converts direct current into mechanical energy using the Lorentz force principle. It has an armature and stator. A DC generator converts mechanical energy into direct current using electromagnetic induction.
2. The key differences between AC and DC machines are that AC motors have rotating magnetic fields and multiple phases while DC motors have a rotating armature. AC generators have fixed coils and rotating magnets, making construction simpler, while DC generators have commutators.
3. The document provides definitions, construction details, working principles, and comparison of the different motor and generator types.
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The document discusses the asynchronous or induction motor, specifically focusing on its construction and working principles. It describes the main components of an asynchronous motor including the stator and rotor, and explains how different types of rotors like squirrel cage and slip ring function through electromagnetic induction to generate torque without a direct electrical connection. The working principle is demonstrated through diagrams showing how a rotating magnetic field is produced in the stator to induce currents in the rotor and make it rotate at a slightly lower synchronous speed.
Armlab
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This document describes direct torque control of a brushless DC motor fed by a matrix converter. It begins with background on brushless DC motors and matrix converters. It then discusses an indirect modulation strategy that decouples control of the input current and output voltage. Direct torque control is implemented for the inverter stage alone using a two-phase conduction scheme. Simulation results show the motor achieving the reference speed while maintaining torque within a narrow band despite load variations. The matrix converter provides sinusoidal source currents with lower total harmonic distortion than a conventional AC-DC-AC converter.
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This document discusses DC motors, including their basic parts and working principles. A DC motor converts electrical energy to mechanical energy using electromagnetic principles. It consists of a rotor and stator, with the rotor containing windings that spin when current is passed through in the presence of a magnetic field. The document compares DC motors to generators and lists different types of motors, explaining the basic operation of a simple DC motor.
Stepper motor site
Stepper motors are capable of precise motion in increments and convert electronic pulses into proportional mechanical movement. They have a rotor inside a stator with electromagnets that pull the rotor teeth into alignment as different coils are energized, resulting in rotation. There are several types including permanent magnet, variable reluctance, and hybrid. Stepper motors can operate in full or half step modes, rotating the shaft by 90 or 45 degrees respectively with each pulse. They are used in applications like printers, CNC machines, and disk drives where precise positioning is needed.
DC Machines with explanation in detail of everything
A DC motor chapter is summarized in 3 sentences:
DC machines can operate as motors or generators and include DC motors which use a DC power source and have a stationary field coil and rotating armature. The speed of a DC motor is proportional to its back EMF and inversely proportional to the armature current. Examples show how to calculate the speed of DC motors under different load conditions by determining the back EMF using the motor's equivalent circuit.
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Stepper motor using monoshot
- 2. A stepper motor is an electromechanical device which converts electrical pulses into discrete mechanical movements. The shaft or spindle of a stepper motor rotates in discrete step increments when electrical command pulses are applied to it in the proper sequence.
- 3. INTERNAL STRUCTURE OF STEPPER MOTOR ROTOR (permanent magnet) TEETH (to define precise rotation STATOR (carry coil for current Flow)
- 4. The principle of Working of stepper motor is Electro- Magnetism. It constructs of a rotor that is of permanent magnet and a stator that is of electromagnets. Now when we gives supply to stator's winding. There will be a magnetic field developed in the stator. Now rotor of motor that is made up of permanent magnet, will try to move with the revolving magnetic field of stator. Working Principle
- 5. Monoshot 2 bit counter Gray code generator motor Power booster Astable
- 10. Q1 Q0 0 0 0 1 1 0 1 1 Clk
- 11. Q1 Q0 A B C D 0 0 ON ON OFF OFF 1100 0 1 OFF ON ON OFF 0110 1 0 OFF OFF ON ON 0011 1 1 ON OFF OFF ON 1001
- 15. 555 IC (2) 1KΩ (6),2.2KΩ,10KΩ resistors 1MΩ,220K pot or variable resistor 100µF capacitor,1µF, 0.01µF capacitor SL100 Transistor (4) 1N4007 (4) 7404 IC 7486 IC 7476 IC 7408 IC
- 16. To find Pulse Width, T = 1.1 x RC.
- 17. Theoretical time period Practical ON time of motor in sec. 1. For R=250kΩ T=28 2. For R=500kΩ T=56 3.For R=750kΩ T=82 3.For R=1000kΩ T=110 Taking C=100uF