![]() These can use scalar algorithms that vary the voltage to determine the frequency of the phases, or volts/hertz. This uses power MOSFETs or IGBTs with high-voltage gate drivers, or power modules that combine the three half-bridges and related gate drives. The typical drive has three half-bridges, each delivering a sine-wave voltage to the stator. But higher pole counts are only possible with more sophisticated control schemes. A four-pole motor is regarded as optimum for the torque and responsiveness needed to for the motor drives of electric cars, for example. More winding can create more poles in the motor, with more complex control required but more accuracy in positioning the rotor. Applying a phase to each of the electromagnets in turn creates the rotating magnetic field that is strong enough to start moving the rotor. As the current passes through the coils on opposite sides of the stator, a two-pole electromagnet is established, creating a two-pole motor. In a 3-phase AC induction motor, there are three stator windings, each usually in two halves, with the rotor winding short-circuited by end rings. ![]() ![]() Working principles of a 3-phase induction motor
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