Title:
減磁判定方法
Document Type and Number:
Japanese Patent JP7278691
Kind Code:
B2
Abstract:
To provide a demagnetization determination method capable of accurately determining the demagnetization of a permanent magnet of a permanent synchronous motor.SOLUTION: When a vehicle is idling (S1: YES), a command value of a current supplied to a motor is set to zero (S4), and a counter electromotive voltage generated in the motor in that state is detected (S5). Based on the counter electromotive voltage, it is determined whether a permanent magnet used in a rotor of a motor 2 is demagnetized. Specifically, the rotation speed of the motor 2 is detected, and a counter electromotive voltage constant is obtained by dividing the counter electromotive voltage by the rotation speed (S6). When the counter electromotive voltage constant is less than a threshold, it is determined that the permanent magnet is demagnetized (S7: YES, S8).SELECTED DRAWING: Figure 2
Inventors:
Mitsuo Ueda
Application Number:
JP2019141828A
Publication Date:
May 22, 2023
Filing Date:
July 31, 2019
Export Citation:
Assignee:
Daihatsu Motor Co., Ltd.
International Classes:
H02P29/00
Domestic Patent References:
| JP2012191677A | ||||
| JP201411867A | ||||
| JP2016178735A | ||||
| JP201870033A |
Attorney, Agent or Firm:
Yuichi Minagawa