How to control the speed of the three-phase induction motor? The speed control method includes: changing the number of poles, stator voltage control, stator frequency conversion, cascade speed control, double-feed speed regulation, hydraulic coupler, electromagnetic slip clutch, etc.
The actual speed of the three-phase asynchronous motor is given by n=ns (1 - s) =120f /p (1-s). It can be seen from the formula that you can change the speed of 3 phase induction motor using changing the number of induction motor’s poles "p," the slip "s," and the frequency of power supply"f."
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