Which type of motor requires a starting mechanism to initiate motion?

Which type of motor requires a starting mechanism to initiate motion?

• A. Induction motor
• B. Permanent magnet motor
• C. Brushless DC motor
• D. Asynchronous motor

Answer: (A)

Induction motors require a starting mechanism to initiate motion primarily because they rely on electromagnetic induction to create rotation. When power is first applied to an induction motor, the rotor is stationary, and therefore, no magnetic field is induced in the rotor to create torque. Since these motors can't produce starting torque on their own while at rest, a starting mechanism, such as a direct-on-line starter, soft starter, or autotransformer starter, is necessary to help gradually bring the motor up to speed. The other types of motors listed operate differently. Permanent magnet motors utilize permanent magnets to create a steady magnetic field, allowing them to start without additional mechanisms. Brushless DC motors, which are similar in operation to permanent magnet motors, also do not typically require a starting mechanism due to their design. Asynchronous motors, while they can refer to induction motors, do not specifically require a starting mechanism in the context mentioned above. Instead, they can sometimes start on their own depending on the specific design and application.

Induction motors require a starting mechanism to initiate motion primarily because they rely on electromagnetic induction to create rotation. When power is first applied to an induction motor, the rotor is stationary, and therefore, no magnetic field is induced in the rotor to create torque. Since these motors can't produce starting torque on their own while at rest, a starting mechanism, such as a direct-on-line starter, soft starter, or autotransformer starter, is necessary to help gradually bring the motor up to speed.

The other types of motors listed operate differently. Permanent magnet motors utilize permanent magnets to create a steady magnetic field, allowing them to start without additional mechanisms. Brushless DC motors, which are similar in operation to permanent magnet motors, also do not typically require a starting mechanism due to their design. Asynchronous motors, while they can refer to induction motors, do not specifically require a starting mechanism in the context mentioned above. Instead, they can sometimes start on their own depending on the specific design and application.