Research On Low-vibration And Lownoise Permanent-magnet Synchronous Motor With Sinusoidal Winding

The development of mechanization and automation has brought convenience to many fields,however,it also brings noise pollution inevitably.As a power source for a variety of equipment,motor is widely used in various fields such as the industry,agriculture,daily life,and etc.In order to relieve the noise pollution caused by motors,many scholars have proposed a variety of motor vibration and noise reduction techniques.In the noise suppression with permanent magnet synchronous motor(PMSM),there are three main kind of techniques: modal research,structure optimization,and optimal control scheme.Even though these methods are able to reduce the motor noise to some extent,a motor running with low vibration and noise had not been developed.In this paper,a low vibration and noise motor with sinusoidal winding is proposed as a new structure of PMSM.Sinusoidal winding and double-layer rotor scheme which can significantly reduce the motor electromagnetic noise are introduced into the proposed motor.A fundamental investigation of the motor structure is carried out in this paper.And the main research works are summarized as followings:Firstly,the structure model of the motor magnetic circuit is established by calculation.To achieve low vibration and low noise,a basic principle of low vibration noise PMSM with sinusoidal winding and double-layer rotor scheme is introduced.A two-dimensional finite element simulation model of motor is established.Secondly,under the conditions of no load and load,the finite element simulation of the proposed PMSM is carried out.Meanwhile,the sinusoidal property of the air gap magnetic field is verified.The radial electromagnetic force waves on the inner surface of the outer rotor are calculated by finite element method,and the spectrum analysis is implemented.The distribution law of the radial electromagnetic force wave of the motor is summarized.Thirdly,a three dimensional finite element simulation of the motor structure modal including the double-layer rotor system,the winding with the double-layer rotor system and the whole motor system is carried out.The modal modes and the corresponding modal frequencies are extracted.The influence of stiffness and mass on the modal frequency is investigated by comparing the modal frequencies of the windings and the double rotor system with the whole motor system.The possibility of resonance is also discussed.Finally,the transient dynamic analysis of the motor is carried out in ANSYS.The radial electromagnetic force calculated by Maxwell finite element simulation software is used as the vibration excitation source to obtain the motor surface radial and tangential vibration displacement.Meanwhile,the spectrum analysis of radial vibration displacement is carried out.Moreover,according to the formula of the radiated sound power,the sound pressure level of the motor is calculated,which verifies the capacity of the new PMSM in reducing the vibration and noise.