On-line detection method for non-uniform demagnetization fault of permanent magnet motor

• Main Authors: YANG GENG, YU YELONG, WANG YUNCHONG, SHEN JIANXIN, HUANG XIAOYAN, LIU ANG
• Format: Patent
• Language: Chinese; English
• Published: 24.10.2023
• Subjects: MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

The invention discloses an online detection method for a non-uniform demagnetization fault of a permanent magnet motor. Performing vector control FOC on the surface-mounted permanent magnet synchronous motor SPMSM to enable the SPMSM to operate stably and normally; reading a Rogowski coil of a current differential sensor to respectively obtain current differential under the action of the effective vector and the zero vector; obtaining stator inductance according to the current differential under the action of the effective vector and the zero vector; and fault characteristic harmonic analysis is carried out according to the current differential and the stator inductance under the action of the zero vector, so that the non-uniform demagnetization fault on-line detection of the permanent magnet motor is realized. According to the method, the anti-interference capability of load fluctuation is higher, the misdiagnosis probability is lower, and the non-uniform demagnetization fault degree can be better and quanti