Single- and three-phase alternating current (AC) motor speed can be controlled by controlling the frequency of the voltage coming to it. Motor speed has a lot to do with the capacity of refrigeration ...

Figure 1. AC inverters, also called AC drives or variable frequency drives, provide the frequency and voltage needed to drive an AC motor. AC drive application basics. Pumps, fans, and conveyor ...

When this output from the frequency converter is connected to an AC motor, it's possible to adjust the motor speed. When using an AC drive for adjusting the motor speed, there are many applications ...

Turndown ratio in AC motor speed control July 31, 2019 by William V. Schrottky, Technical Writer ... which controls the speed by modifying the frequency fed to the motor.

The three-phase AC motor is designed to be operated from an AC supply, which has a fixed voltage and frequency. The supply frequency and the number of poles in the motor set the synchronous speed ...

The topic of motors and motor control techniques is wide and varied. Part one of this two-part article will cover the principles of alternating-current (AC) motor operation and control. Part two will ...

Don't forget to measure the coil voltages at the motor control circuit. Motor tripping problems for AC induction motors are commonly associated with sags and low voltages at the control relay and ...

When energy-efficiency costs come into play, more designers are opting for the electronically commutated motor rather than familiar AC and DC versions. For motor applications, engineers have ...