An electric motor is a device that converts electrical energy into mechanical energy. It plays a crucial role in modern industries, transportation, and home appliances.
Electric motors operate on the principle of electromagnetic induction: When a current-carrying conductor is placed in a magnetic field, it experiences a force that causes motion.
DC Motors: Used in robotics, toys, and automation. AC Motors: Found in industrial machinery, fans, and household appliances. Synchronous & Induction Motors: Essential in power plants and large-scale applications.
A) Synchronous motors do not require slip rings. B) Induction motors operate without external excitation. C) Both A & B. D) None of the above.
What is the primary difference between a synchronous and an induction motor?
B) Induction motors operate without external excitation. Explanation: – Synchronous motors require an external DC excitation for their rotor to maintain synchronization with the stator's rotating magnetic field. – Induction motors, on the other hand, generate their own rotor current through electromagnetic induction, eliminating the need for external excitation. – Slip rings are required in wound rotor induction motors, but not in all synchronous motors. Hence, option A is incorrect.