PERMANENT MAGNET MOTOR, REFRIGERATION COMPRESSOR, AND AIR CONDITIONING UNIT

摘要

Disclosed are a permanent magnet motor, a refrigeration compressor, and an air conditioning unit. A stator (20) and a rotor (30) are mounted inside a case (10) of the permanent magnet motor, and separate the inner cavity of the case (10) into a first inner cavity (10a) and a second inner cavity (10b). An air gap (10c) is formed between an inner circle surface of the stator (20) and an outer circle surface of the rotor (30). Axial ventilation holes (213) in communication with the first inner cavity (10a) and with the second inner cavity (10b) are disposed in teeth (212) of a stator core (21). The rotor (30) comprises a rotor core (31) and rotor pressing rings (32) disposed in an axial direction at both sides of the rotor core (31). A partition (33) is disposed between the rotor core (31) and at least one of the rotor pressing rings (32). An outer edge of the partition (33) extends into the air gap (10c), which enhances the air blocking effect and prevents more heat-exchange fluid from entering the air gap (10c), so that the axial ventilation holes (213) form a unique channel of the whole loop, thereby reducing the amount of the heat-exchange fluid required and realizing a higher cooling efficiency.