Broad-pole type square-wave three-phase brushless permanent magnet direct current motor and assembling method thereof

摘要

A broad-pole type square-wave three-phase brushless permanent magnet direct current motor and an assembling method thereof are disclosed. The number of magnetic poles on a rotor core is: 2P=4. The number of slots in a stator core is: Z=6. Six teeth on the stator are composed of three large teeth and three small teeth. The sum of mechanical angels of one large tooth and one small tooth is 120 degree. Electrical angles corresponding to the mechanical angles are: P* 120=240° . Three-phase concentrated windings are wound on three large teeth separately, and only one winding is arranged at each phase. The advantages of the motor are low positioning torque, simple structure, effective production cost, convenient to wind the windings, and low copper loss, etc.

主权项

1. A broad-pole type square-wave three-phase brushless permanent magnet direct current motor, the motor comprising a rotor core provided with a plurality of pairs of permanent magnets thereon, and a stator slot provided with three phases of windings therein, wherein:
the rotor core has a number 2P of magnetic poles, wherein 2P=4; the motor's stator core has a number Z of slots wherein Z=6, and accordingly six teeth including three large teeth and three small teeth; the three phases of windings are concentrated windings which are respectively wound around the three large teeth, one phase including one winding only; the windings and the teeth are arranged in the following order: the large tooth wound with phase-A winding →a small tooth →the large tooth wound with phase-B winding →a small tooth →the large tooth wound with phase-C winding →a small tooth, wherein A denotes phase-A concentrated winding; B denotes phase-B concentrated winding; and C denotes phase-C concentrated winding; the stator core comprises a large tooth core and three small tooth cores, the large tooth core having three large teeth and three insertion slots, each of which is arranged in a yoke between every two adjacent large teeth; and the small tooth cores are inserted into respective insertion slots via an end part thereof.