Electric motor and compressor with same

摘要

An electric motor according to the present invention includes stator (10) which has ring-shaped yoke (11) and a plurality of teeth (12) disposed at the inner peripheral part of yoke (11). Yoke (11) and teeth (12) configure slots (13) in which windings (15) are wound via electric insulator (14). Moreover, the motor includes rotor (20) that is rotatably held and faces the inner periphery of stator (10) via a slight gap. The rotor includes rotor iron core (21) having permanent magnets (22) that are disposed in the inside or on the surface of the core. Furthermore, a plurality of yoke recesses (16) is disposed only in the yoke (11) parts of slots (13).

主权项

1. An electric motor comprising:
a stator including:
a ring-shaped yoke; anda plurality of teeth disposed at an inner peripheral part of the yoke, the yoke and the teeth configuring slots in which windings are disposed via electric insulator; and a rotor being rotatably held, facing an inner periphery of the stator via a gap, and including a rotor iron core having a permanent magnet disposed at one of an inside and a surface of the core, wherein a plurality of yoke recesses are disposed only in yoke parts of the slots, each of the teeth has a narrow part, and a shortest distance between an adjacent two of the yoke recesses across each of the teeth is larger than a tooth width of the each of the teeth exclusive of the narrow part to reduce a harmonic iron loss and a leakage current.