Permanent magnet motor

摘要

An electric motor includes a stator and a rotor rotatably installed in the stator. The stator has a housing and a plurality of permanent magnets. The outer diameter of the housing is less than 40 mm and the ratio of the maximum thickness of the magnets in the radial direction of the rotor to the diameter of the rotor is in the range of 1:7 to 1:50.

主权项

1. A permanent magnet motor comprising:
a stator having a housing with a cylindrical configuration and a plurality of magnets installed at an inner surface of the housing; and a rotor installed in the stator and having a rotor core, wherein the housing defines an outer diameter at a location corresponding to a location of the rotor core, the outer diameter of the housing is less than 40 mm and a ratio of maximum thickness of the magnets in radial direction of the rotor to a diameter of the rotor is in the range of 1:7 to 1:50 and wherein the stator further comprises a brush card installed inside the housing, brushes and an EMI (electromagnetic interference) suppression component mounted on the brush card, and a pair of lead wires connected to the brushes and configured for connecting to a power source to thereby feed power to the brushes, said pair of lead wires extending through the EMI suppression component, wherein the housing of the stator defines a cutout at an end thereof, the EMI suppression component has a through hole facing the cutout of the housing, said pair of lead wires extending to outside of the housing after passing through the hole and the cutout successively.