Patent ID: 11888357
Assignee: NIDEC MOTOR CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 3:
4. An electric motor assembly comprising:
a motor including—
a stator assembly,
a rotor assembly comprising a rotor shaft rotatable about a rotor axis,
a housing defining a motor chamber receiving at least a portion of the rotor assembly and the stator assembly, the housing including an endshield rotatably supporting the shaft, and
a sensor target fixed relative to the rotor shaft and thereby oriented in a known position relative to a back electromotive force (BEMF) waveform of the motor;

a rotary position sensor configured to sense the sensor target; and
an alignment plate;
said rotary position sensor being fixed relative to the alignment plate,
said alignment plate being adjustably coupled to the endshield for rotational adjustment that is substantially concentric with the rotor axis, such that the rotary position sensor is adjustable to align a signal waveform produced by the rotary position sensor with the BEMF waveform within a predetermined measurement range,
said endshield including a counterbore defined therein, the counterbore being substantially concentric with the rotor axis,
said counterbore defining an annular wall and an adjacent planar base wall, the planar base wall being substantially perpendicular to the annular wall and the rotor axis,
said alignment plate presenting an outer diameter,
said annular wall presenting an inner diameter sized to define a slip fit between the annular wall and the alignment plate,
said outer diameter of the alignment plate being in a range between and including about one hundred and fifteen (115) millimeters and about one hundred and twenty-five (125) millimeters.