Patent ID: 9124166
Filing Date: 2015-09-01
Classification: H02K

Abstract:
1. A brush direct motor, comprising: a stator comprising a plurality of coils that correspond to N phases; a rotor comprising a shaft and 2P radially polarized permanent magnetic poles; a commutator fixed to the shaft, comprising: a first conductive ring; a second conductive ring spaced from the first conductive ring; a plurality of first bars extending from the first conductive ring; a plurality of second bars extending from the second conductive ring; a plurality of transiting plates; a body supporting the first conductive ring, second conductive ring, first bars, second bars and the transiting plates; and a plurality of resistors, wherein the first and second bars are alternately arranged along a brush path, at least one of the transiting plates is disposed between each of the first bars and the second bars, and one of the resistors is respectively connected between each of the transiting plates and one of the adjacent first and second bars; two first brushes respectively arranged to make sliding electrical connected to the first and second conductive rings; and a plurality of second brushes arranged to make sliding electrical contact with the first bars, second bars and transiting plates and electrically connected to the N phases, wherein when one of the second brushes leaves one of the first and second bars to contact with a corresponding transiting plate, a corresponding phase of coils is connected to said one of the first and second bars via said one of the second brushes, the corresponding transiting plate and a corresponding resistor which is connected between said one of the first and second bars and the corresponding transiting plate, and power is transmitted to the corresponding phase of coils via a corresponding first brush, said one of the first and second bars, the corresponding resistor, the corresponding transiting plate and said one of the second brushes in series from a direct power source.