ELECTRIC MOTOR

摘要

An electric motor includes a stator having an outer peripheral surface including a plurality of projections and a housing having an inner peripheral surface including a plurality of recesses and holding the stator in a state of respective fits of the projections with the recesses. The housing is internally formed with a cooling channel, which includes a plurality of main channels each formed in an inter-recess region defined between circumferentially adjacent recesses and a connection channel axially shifted from a recess and extending across the recess to connect main channels adjacent across the recess. The electric motor is capable of effectively cooling a stator without upsizing.

主权项

1. An electric motor, comprising:
a rotatable motor shaft; a rotor rotatable integrally with the motor shaft about an axis of the motor shaft; a stator arranged around the rotor to rotate the rotor; and a housing that accommodates the rotor and the stator and is internally formed with a cooling channel which allows refrigerant to flow therein, wherein: the stator has an outer peripheral surface including a plurality of projections projecting radially outward at respective positions arranged circumferentially; the housing has an inner peripheral surface including a plurality of recesses fitted with the projections, respectively, and holds the stator in a state of respective fits of the projections with the recesses; and the cooling channel includes a plurality of main channels that are formed in respective inter-recess regions defined between circumferentially adjacent recesses, and a connection channel located at a position axially shifted from a recess and crossing the recess to interconnect main channels adjacent across the recess.