Can the voltage regulating module be used as AC motor speed regulation?
Want to control motor speed, only changing voltage frequency on the stator can (with more of a V/F control, change the frequency corresponding to the change of voltage amplitude), change the voltage regulator will not only change the frequency, voltage, it will only change the motor torque (the size of the voltage will not change, otherwise it will cause the stator coil current is too large; for example, if you burn the motor) with voltage regulator voltage applied to the motor will change the speed two times, will have little change but far less than the two times. When using the voltage regulator experiment, do pay attention to the rated voltage of the motor, otherwise it may cause permanent damage to the motor!
In fact the motor rotor is able to rotate, in addition to the three-phase alternating current frequency, and the stator winding pole outside, also with the rotating magnetic field intensity, rotating magnetic field intensity and current of the stator winding about. Because the voltage of the input stator winding is reduced, the current input to the stator winding is reduced, and the rotating magnetic field strength is reduced. It also reduces the torque of the rotor, and thus reduces the speed of the motor.
Ordinary three-phase AC motor (commonly used three-phase AC asynchronous motor) is the stator winding into three-phase alternating current, resulting in a rotating magnetic field (the rotation of the magnetic field speed n=60f/p, also known as synchronous speed). The rotating magnetic field is relative to the rotor winding (usually the squirrel cage winding), and the rotor winding induces the rotor induced current due to the electromagnetic induction principle. The rotor current produces a tangential torque under the influence of the magnetic field, so the rotor spins.
