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

Claim 8:
9. 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 electric motor assembly further comprising two or more spaced apart alignment pins,
said rotary position sensor including a sensor housing defining two or more pin holes,
said alignment plate defining two or more pin openings, each of which is aligned with a respective one of the pin holes,
each of said alignment pins being received in aligned ones of the pin holes and pin openings, such that the pins secure the rotary position sensor in a rotatably fixed position relatively to the alignment plate.