Patent ID: 8004135

Claim:
An electric motor and controller assembly, comprising: an electric motor comprising rotor shaft extending along a longitudinal axis from a rear end to an output end; the electric motor further comprising an end housing surrounding the rear end of the rotor shaft, the end housing rotatably supporting the rear end of the rotor shaft; a magnet mounted at the rear end of the rotor shaft; a controller removably mounted at a rearward side of the end housing outside of the electric motor and parallel to the longitudinal axis, such that the controller can be disassembled from the end housing without disassembling the end housing from the electric motor; the controller comprising a sensor and a controller housing, the controller housing including an alignment structure provided at an interface between the controller and the end housing for positioning the sensor relative to the magnet when the controller housing is mounted to the end housing; and wherein the controller housing does not support the rotor shaft; wherein the alignment structure includes a first positioning member for positioning the sensor in a radial direction of the longitudinal axis and a second positioning member for positioning the sensor in a circumferential direction of the longitudinal axis; wherein the second positioning member includes a protrusion adapted to be inserted into a cutout portion of the end housing; and wherein the protrusion defines a recess and the sensor is received in the recess.