The Research Of Noise Of Control Strategy And Design Parameters Of Permanent Magnet Synchronous Electrical Spindle

Noise and vibration of Permanent magnet Synchronous Motorized Spindle(PMSMS)are very important index used to measure the performance of the PMSMS. The problem of noise and vibration has also been a difficult dilemma. In this paper, the noise and vibration characteristics of the PMSMS are researched by Finite Element Method(FEM). The main content includes that the calculation of the electromagnetic field of the PMSMS, the effect of mechanical structure on the cogging torque, the electromagnetic field calculation of the sinusoidal and frequency converter power supply, the modal experiment of PMSMS unit, experimental comparison of no load and rated load of PMSMS and the relationship between the noise value and the switching frequency and the speed of the spindle. Three parts are included as follows:First of all, the air gap magnetic field of the PMSMS are calculated, which extract the radial electromagnetic force and tangential electromagnetic force varied with time and with the position. The instantaneous torque is obtained by the integral of the tangential electromagnetic force with numerical integration. The spectrum analysis of radial electromagnetic force is conducted, which lays the foundation for the analysis of cogging torque and vibration and noise of the PMSMS.Secondly, three methods to weaken cogging torque are promoted. The first one is to research the surface magnet PMSMS with 4 pole 48 slot by the FEM. The optimal distribution and angle of the permanent magnet is obtained. The second one is to research effect of rotor structure of the interior PMSMS with 4 pole 6 slots on the cogging torque. The result that optimal shape parameter of the rotor structure is obtained. The three one is to research the effect of air gap shape of surface magnet PMSMS with 4 pole 6 slot on the cogging torque. The main research parameter is the longest gap length and offset position angle. The research shows that the parameter has no effect on the rated torque of the PMSM. However, it has a very important on weaken cogging torque. Therefore, the optimum design parameters are obtained by the research. In conclusion, through the research of PMSMS by these three methods, theoretical basis is provided for design of PMSMS with lower cogging torque.The third part is the analysis of the air gap magnetic field of a 68 k W PMSMS in the sinusoidal power supply and frequency converter power supply. It shows that the electromagnetic force by the inverter power supply increases some harmonic current components. Meanwhile, the experimental analysis of the modal and noise and vibration is carried out. The reliability of the simulation is verified by comparing the simulation data with the experimental data. The noise and vibration signals of the no load and rated load are compared with that of the radial electromagnetic force. The radial electromagnetic force is the main cause reducing the vibration and noise. At the same time, the relationship between the noise value and the switching frequency and the speed of the motorized spindle is studied.