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b
Explanation: The repulsion motor starting method is one of the starting methods of
single phase induction motor. The commutator windings are dominant and hence gives
good starting torque
The repulsion motor starting method involves a unique approach to start a single-phase motor which is specially designed with a repulsion mechanism. This type of motor uses brushes and a commutator similar to those found in a DC motor, but it operates on AC power. Here is what happens during the starting process:
1. Brush Contact: Initially, the brushed are short-circuited and in direct contact with the commutator segments. Unlike in operation, where they may be lifted or in specific positions for optimal performance, at startup, their full engagement is crucial.
2. Application of AC Voltage: When AC voltage is applied to the stator of the motor, a magnetic field is generated. This magnetic field induces a current in the rotor through the commutator and brush assembly.
3. Magnetic Repulsion: As the currents flow through the rotor’s windings, they interact with the stator’s magnetic field. This interaction is governed by the law of electromagnetic induction and leads to a repulsion that causes the rotor to turn. The specific direction of rotation is determined by the brush positioning relative to the stator field.
4. Rotor Movement: The initial movement of the rotor is due to the repulsion between the magnetic fields of the stator and those induced in the rotor windings. This repulsion force is strongest at the start, providing the necessary torque to overcome inertia and start the motor.
5. Speed Regulation & Transition to Operation: As the