Given the following information: (Note: Values were determined for operations at 60 Hz.) Three-Phase Induction Motor A Stator resistance: 0.24 ohms per phase Stator reactance: 0.30 ohms per phase Rotor resistance referred to the stator: 0.15 ohms per phase Rotor reactance referred to the stator: 0.27 ohms per phase Magnetizing reactance: 30 ohms per phase Determine the following: 1. Determine the power developed in Induction Motor A given that the supply is providing power at 440 volts 60 Hz and the slip is 30%. 2. 3. Determine the magnitude of the rotor current referred to the stator for Induction Motor A given that the supply is providing power at 440 volts, 60 Hz and the slip is 30%. Determine the slip at which the maximum torque occurs for Induction Motor A operating with an input line voltage of 440 volts at 60 Hz.

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Synchronous Motor

The synchronous motor is an AC electric type motor where at a steady-state the shaft rotation is synchronized with the supply current variable-frequency. To an integral number of AC cycles, the rotation period is exactly equal. The stator of the motor in the synchronous motor contains multi-phase AC electromagnets due to which a magnetic field is created that rotates in time with the oscillation of the line current. The rotor contains a permanent magnet and the rotor rotates in synchronization with the stator field at the same rate and provides the second synchronized magnetic field which is rotating in nature as a result. When the synchronous motor is supplied with independently excited multi-phase AC electromagnets on both the rotor and the stator, it is termed as a doubly-fed machine. The most widely used AC-type motors are the synchronous AC motor and the induction AC motors.