Patent ID: 8148860
Filing Date: 2012-04-03
Classification: H02K

Abstract:
1. A PMDC motor comprising a stator and a rotor rotatably mounted to the stator, the stator comprising a housing and an end cap mounted to one end of the housing, the end cap supporting, on an inner surface thereof, a first brush, a second brush, a first terminal, a second terminal, a first choke connected in series with the first brush and the first terminal, a second choke connected in series with the second brush and the second terminal, a set of capacitors electrically connected with the two terminals, and a PTC thermistor connected in series with the second terminal, wherein each of the two chokes comprise an inductor core extending axially and a winding wound about the inductor core; the rotor comprising a shaft having a first end supported by a bearing held by the end cap; and a ring magnet mounted onto the first end of the shaft; wherein a PCB is mounted adjacent to the end cap and at least one Hall sensor is mounted on the PCB and arranged to detect rotation of the ring magnet; the motor further comprising an end cap cover which forms a chamber with the end cap, a first leg and a second leg, wherein first and second legs are formed on the end cap and extend axially outwards to engage the end cap cover and the PCB is disposed within the chamber.