Which statement is true about the rotor of a permanent magnet motor compared to the stator's field?

Which statement is true about the rotor of a permanent magnet motor compared to the stator's field?

• A. Induction motor
• B. Permanent magnet motor
• C. Synchronous motor
• D. Universal motor

Answer: (B)

In a permanent magnet motor, the rotor is made of permanent magnets, while the stator’s field is created by current in the stator windings to produce a rotating magnetic field. The rotor magnets stay magnetized without any electrical current, and torque results from the interaction between those permanent magnets and the rotating stator field as they align with it. This is what sets permanent magnet motors apart from other types: the rotor isn’t powered or induced; it’s just magnetized material responding to the stator’s rotating field. The other motor types involve windings or current in the rotor (induction, universal) or are defined by how the rotor and stator fields interact in a synchronous setup, but the defining feature here is the permanent-magnet rotor interacting with the stator’s rotating field.

In a permanent magnet motor, the rotor is made of permanent magnets, while the stator’s field is created by current in the stator windings to produce a rotating magnetic field. The rotor magnets stay magnetized without any electrical current, and torque results from the interaction between those permanent magnets and the rotating stator field as they align with it. This is what sets permanent magnet motors apart from other types: the rotor isn’t powered or induced; it’s just magnetized material responding to the stator’s rotating field. The other motor types involve windings or current in the rotor (induction, universal) or are defined by how the rotor and stator fields interact in a synchronous setup, but the defining feature here is the permanent-magnet rotor interacting with the stator’s rotating field.