DIAGNOSTIC PROCEDURE AND DIAGNOSTIC DEVICE FOR A THREE-PHASE AC MOTOR

DE602021031248T2Active Publication Date: 2025-05-21NISSAN MOTOR CO LTD
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Patent Information

Application Number
DE602021031248
Authority / Receiving Office
DE · DE
Patent Type
Patents
Current Assignee / Owner
Filing Date
2021-01-14
Publication Date
2025-05-21
Estimated Expiration
2041-01-14

AI Technical Summary

Technical Problem

When current is applied to only two phase windings of a three-phase alternating current motor for resistance detection, the motor may rotate significantly due to the inability to perform vector control, causing user discomfort during diagnosis.

Method used

A diagnostic method that applies predetermined voltage in specific current paths, including a current path with the highest rate of change of generated torque with respect to rotation angle, to minimize motor rotation during diagnosis by controlling the order of current application between the first, second, and third phase windings.

Benefits of technology

This approach effectively suppresses motor rotation during diagnosis, reducing user discomfort and efficiently detecting abnormalities in the motor windings by minimizing the integral value of generated torque.

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Abstract

A diagnostic method of a three-phase alternating current motor having a first phase winding, a second phase winding, and a third phase winding, including: applying predetermined voltage for a predetermined period of time in an order of a first current path, a second current path, and a third current path among three current paths of a current path in which current flows from the first phase winding to the second phase winding via a neutral point, a current path in which current flows from the second phase winding to the third phase winding via a neutral point, and a current path in which current flows from the third phase winding to the first phase winding via a neutral point; and detecting an abnormality in the first phase winding, the second phase winding, and the third phase winding based on current values flowing in the first current path, the second current path, and the third current path when the predetermined voltage is applied, wherein the second current path is a current path in which a rate of change of generated torque with respect to change of the rotation angle at a current rotation angle of the three-phase alternating current motor is greatest among the three current paths, and a rotation direction of the three-phase alternating current motor when the first current path is energized is a direction in which an absolute value of generated torque generated when starting energization of the second current path decreases.
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