A 4-pole, 3-phase , 50 Hz induction motor has a rotor resistance of 0.022 per phase and standsti leakage reactance is 0.12 per phase. Determine the speed to give maximum torque. What externa resistance per phase is necessary in the rotor circuit to give half maximum torque at starting?

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Single Phase Induction Motor

The single-phase induction motor or engine consists of a single rotating phase in the stator and a rotating cage in the rotor. When phase one supply is connected to the stator winding, a magnetic field is generated. In the pulsating field, the rotor does not rotate due to inertia. So, a single-phase import motor does not start and requires some initial methods.