Abstract: Aiming at the electromagnetic noise problem of the permanent magnet synchronous motor for electric vehicle，the causes of noise were analyzed from the perspective of current harmonic and electromagnetic force. It has shown that current harmonics control is an effective method for motor electromagnetic noise optimization. A current harmonic injection method aiming at reducing the noise sound pressure level was proposed. The corresponding harmonic current amplitude and phase parameters under the optimal noise state were determined by calibration，so as to achieve the noise control goal. Compared with other existing harmonic suppression methods，the control method is simpler and easier to implement，and effectively improves the electromagnetic noise of electric vehicles without additional cost and weight increase.

      Key words: permanent magnet synchronous motor（PMSM）；electromagnetic noise；harmonic injection；

control