Electrical Machines 面试题与答案
问题 6. Explain the concept of power factor in electrical machines.
Power factor is the ratio of real power to apparent power in an electrical system. It indicates the efficiency of power utilization and is crucial for electrical machines.
问题 7. What is the role of a commutator in a DC motor?
The commutator in a DC motor reverses the direction of current in the coil windings, ensuring a continuous unidirectional torque and preventing the motor from stalling.
问题 8. Define torque in the context of electrical machines.
Torque is the measure of the rotational force exerted by a motor. In electrical machines, it is the product of the force applied and the distance from the axis of rotation.
问题 9. What is the function of the stator in an electric motor?
The stator provides a stationary magnetic field in electric motors, inducing a magnetic field in the rotor and causing it to rotate.
问题 10. Explain the concept of slip rings in electrical machines.
Slip rings are conductive rings used in certain rotating electrical machines to maintain electrical connections with the stationary part, allowing for continuous rotation without tangling wires.
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