Invention Grant
- Patent Title: System and method for addressing failure-to-start condition in electric motor with internal magnets
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Application No.: US17107479Application Date: 2020-11-30
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Publication No.: US11569763B2Publication Date: 2023-01-31
- Inventor: Bret S. Clark , Christopher D. Schock , Prakash B. Shahi
- Applicant: Nidec Motor Corporation
- Applicant Address: US MO St. Louis
- Assignee: Nidec Motor Corporation
- Current Assignee: Nidec Motor Corporation
- Current Assignee Address: US MO St. Louis
- Agency: Hovey Williams LLP
- Main IPC: H02P1/46
- IPC: H02P1/46 ; H02P21/18 ; H02K1/27 ; H02P1/02 ; G01R31/34 ; H02K1/2706

Abstract:
A system and method for identifying and responding to a condition in which an electric motor fails to start. A rotor core includes slots in which magnets are received to produce an electrical reluctance. A motor controller determines a position of the rotor, uses the determined position to convert a torque demand to a demanded D-axis current value, and compares the demanded value to a supplied D-axis current value. If the demanded value differs from the supplied value by at least a pre-established threshold amount, then the motor is restarted. Otherwise, the difference between the torque demand and an actual current is used to drive a voltage applied to the motor. The controller may also implement a sensorless technology, and may restart the motor if the demanded value differs from the supplied value by at least the threshold amount even if the sensorless technology determines that the motor started.
Public/Granted literature
- US20220173672A1 SYSTEM AND METHOD FOR ADDRESSING FAILURE-TO-START CONDITION IN ELECTRIC MOTOR WITH INTERNAL MAGNETS Public/Granted day:2022-06-02
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