What Are Motors?
1-2 Components Of A Motor
Motor components are classified into five main portions (1) to (5) as Fig. 1.2 shows.
- (1) Rotor
- Rotating part
- (2) Bearing
- Supporting part of the rotating shaft of the rotor
- (3) Stator
- Part generating force used to rotate the rotor
- (4) Bracket or end plate
- Bearing supporting part integral for the stator
- (5) Lead wire
- Wire connected to the drive circuit supplying power to the motor or wire connected to the power supply
Of these components, the parts most closely related to the basic classification method for motors are the stator and the rotor. The following four types are listed as the typical stator structure:
- A: Stator of distributed winding
- B: Stator of concentrated winding
- C: Inductor stator
- D: Permanent magnet stator
Rotors can be classified into 10 different types.
- (1) Squirrel-cage rotor
- (2) Salient-poled squirrel-cage rotor
- (3) Semi-hard steel rotor
- (4) Soft-steel rotor
- (5) Salient-poled lamination rotor
- (6) Soft-steel rotor with fine teeth
- (7) Permanent-magnet rotor
- (8) Inductor rotor
- (9) Winding rotor
- (10) Commutator rotor
In the following Section 1.3, we will discuss how various types of motor are classified by combining the stator and the rotor from among the above-listed stator A to D and rotor (1) to (10).