Chopper based dc motor speed control
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This document discusses using a chopper circuit to control the speed of a DC motor. A chopper circuit uses MOSFETs to vary the voltage applied to the motor, allowing for remote speed control. This method is more efficient and compact than previous variable resistor and transformer-based controls. Pressing buttons on the chopper circuit varies the MOSFET firing angle, decreasing motor speed as the firing angle increases. The chopper control reduces motor current, losses, temperature, noise, and increases lifetime compared to DC operation.
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Chopper based dc motor speed control
- 1. CHOPPER BASED DC MOTOR SPEED CONTROL ABSTRACT Speed control of dc motor is based on adjusting the voltage which gets to the motor. Speed control has been possible for many decades by using adjustable power resistors and adjustable transformers. Those methods have been used in sewing shops, drilling machines and other so many applications. The problem of those speed controlling methods have been that they are big, expensive, have poor efficiency and they are hard to control from remote location. In particular the high peak to peak current gives poor motor efficiency and the consequential high brush temperature leads to limited motor lifetime. When operating in DC mode, significant improvements are obtained. The RMS and peak to peak current of the motor are smaller, reducing Iron losses and brush temperature. Operating in DC mode enables shrinking of the motor size, and increasing the motor lifetime. Furthermore, magnetic constriction of motor core and torque ripple decrease; the 100Hz noise is further reduced. In this project we are going to operate our DC motor. In this project we can vary the speed of motor by pressing the buttons. That means motor will rotate with more speed when the firing angle of MOSFET is less and speed will decreases as the firing angle increases.