It has been decided to establish a new electrical machines laboratory. This project includes a new floor model, and the power cables need to be tied with the existing network. The load is estimated to be 5 electrical motors (3 induction motors & 2 synchronous motors) with a demand of 125kW. A three-phase induction motor is installed at first which consumes 22.38 kW and it has 6 poles. The losses measured when the motor runs on 950 rpm is 1.492kW across the load. The motor needs 550VV, 50 Hz supply with a phase displacement of 28.3 °. You are required to calculate and prepare a datasheet for the following parameters. (i) Slip (ii) Rotor Copper Loss (iii) Total input of the stator losses is 2000 w (iv) Efficiency (v) Starting current (vi) The No. of complete cycles of the rotor electro motive force per minute

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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.