关键词: 内置式永磁同步电机, 振动噪声, 田口法, 不对称转子

Abstract: Aiming at the problem of excessive vibration noise caused by the rich content of load air gap magnetic field harmonics in permanent magnet synchronous motors, a new rotor structure was proposed, in which a sinusoidal function with adjustable amplitude and phase was superimposed on the basis of inverted cosine chipping to weaken the load air gap magnetic density harmonics by adjusting the amplitude and phase to suppress the vibration noise of the motor. Using Taguchi's method, the load air-gap magnetic density THD and electromagnetic torque were selected as the optimization objectives, and the amplitude, phase and rotor q-axis length of the superimposed sinusoidal function were selected as the optimization parameters, and orthogonal experiments were carried out to get the best combination of the optimization parameter. Prototypes and experimental tests were carried out, and the results showed that the new rotor structure could reduce the maximum value of the A-weighted SPL by 5. 9 dB( A) compared with that of the original structure, and it was verified that the new asymmetrical rotor structure can effectively reduce the vibration noise of the motor.

Key words: interior permanent magnet synchronous motor, vibration and noise, Taguchi method, asymmetric rotor