A 400 volts DC shunt motor draws 30 amperes while supplying the rated load at a speed of 120 rad/sec. The armature resistance is 1.0 ohm and the field winding resistance is 250 ohms. Determine the external resistance that must be inserted in series with armature circuit so that, the armature current should not exceed 150% of its rated value, when the motor is plugged. Find the braking torque, at the instant of plugging.

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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.