The
motor controller first turns that
AC to DC, then turns the DC back into
AC at the right frequency. It uses a device called a rectifier to make DC current. ... All the negative current is shunted into one wire and all the positive current is shunted into another one, making DC power.
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The speed controls of three phase induction motor from rotor side are further classified as: Adding external resistance on rotor side. Cascade control method.
...
Synchronous Speed
- V / f control or frequency control.
- Changing the number of stator poles.
- Controlling supply voltage.
- Adding rheostat in the stator circuit.
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There are four basic motor controller and drive types: AC, DC, servo, and stepper, each having an input power type modified to the desired output function to match with an application.