Demagnetization Analysis of Interior Permanent Magnet Machines Under Integrated Charging Operation

Integrated charging, multiplexing the motor windings for battery charging in electric vehicles, can improve the onboard fast charging capability without increasing the weight and cost. However, during the charging operation, the magnets in the traction motor have a risk of irreversible demagnetization caused by the charging currents. This paper investigates the demagnetization effects of charging current on magnets in interior permanent magnet machines. By using numerical analysis and circuit-coupled simulation, the demagnetization effects during integrated charging are evaluated.

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