Detailed answer to the basic structure of permanent magnet brushless DC motor:
1. Permanent magnet: Permanent magnet brushless DC motor uses permanent magnet to generate a magnetic field, and its magnetic field line direction interacts with the salient pole and soft magnetic material on the rotor, thereby generating torque.
2. Rotor: The rotor is an important part of the permanent magnet brushless DC motor, which is usually made of silicon steel sheet and aluminum casting. A salient pole is machined on the silicon steel sheet to generate torque by interacting with the permanent magnet; Rotor grooves are machined on aluminum castings for embedding three-phase armature windings.
3. Stator: The stator is composed of an iron core and a three-phase armature winding. The iron core consists of silicon steel sheets, which are used to generate magnetic flux; The three-phase armature winding consists of copper wires that are used to interact with the rotor to generate torque.
4. Drive circuit: The drive circuit is used to control the power-on sequence and power-on time of the commutator, thereby controlling the rotation of the motor.
These parts together form the basic structure of permanent magnet brushless DC motor.
Therefore, according to this question, the correct answer is the rotor position sensor, the motor body, and the electronic switch circuit; The options are A, B, and C.