Different Types of AC Motor Control Systems (part 2)
Continued from the article: Different Types of AC Motor Control Systems (part 1)
Sensorless Control System
AC motors that don't run at constant speed have speed sensors. That sensor enable the motors to operate accurately at a slower pace. Without these speed sensors, AC motors can't run at constant speed. Instead, it weakens.
The sensorless control system allows AC motors to operate accurately without the need to use speed sensors. It provides control of the speed and direction of the motor at low, even zero speed. To do this, it matches (synchronizes) the rate at which the current flows with the direction of the motor. Thus it runs at constant speed.
AC Drives (variable speed drives)
AC Drives (variable speed drives) are AC motor control systems used to control the speed of induction motors. They increase the speed of the motor, either by increasing the resistance of the windings in the motor, or by reducing the speed of the motor, depending on the voltage or signal input.
These control systems alter the rate at which electric energy is supplied to the AC motors. Thus the frequency (V/Hz) of the voltage is maintained at minimum and maximum operating values.
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You will be interested in reading the articles: AC drives (variable speed drives, VSDs).
