What are the common types of AC motors?

What are the common types of AC motors?

• A. DC motors and servo motors
• B. Induction motors and synchronous motors
• C. Universal motors and stepper motors
• D. Reluctance motors and hysteresis motors

Answer: (B)

AC motors are best understood as belonging to two main categories: induction motors and synchronous motors. Induction motors get their torque from a rotating magnetic field produced by the stator; the rotor spins a little slower than the field, so current is induced in the rotor and torque results. They are simple, rugged, inexpensive, and highly effective for a wide range of applications, which is why they make up the bulk of AC motor use. Synchronous motors, on the other hand, run at the exact speed of the rotating magnetic field because the rotor locks in step with it, typically using DC excitation or permanent magnets. This precise speed and good efficiency make them ideal when exact speed or timing is important. Other motor types mentioned are not the standard broad categories of AC motors. DC motors and servo motors are typically powered or used in DC or specially controlled systems. Universal motors and stepper motors are specialized designs that aren’t considered the typical broad classes of AC motors. Reluctance and hysteresis motors exist but are more niche and far less common in everyday AC motor applications.

AC motors are best understood as belonging to two main categories: induction motors and synchronous motors. Induction motors get their torque from a rotating magnetic field produced by the stator; the rotor spins a little slower than the field, so current is induced in the rotor and torque results. They are simple, rugged, inexpensive, and highly effective for a wide range of applications, which is why they make up the bulk of AC motor use. Synchronous motors, on the other hand, run at the exact speed of the rotating magnetic field because the rotor locks in step with it, typically using DC excitation or permanent magnets. This precise speed and good efficiency make them ideal when exact speed or timing is important.

Other motor types mentioned are not the standard broad categories of AC motors. DC motors and servo motors are typically powered or used in DC or specially controlled systems. Universal motors and stepper motors are specialized designs that aren’t considered the typical broad classes of AC motors. Reluctance and hysteresis motors exist but are more niche and far less common in everyday AC motor applications.