Rotor Dynamics Characteristic Analysis of Multi-Degrees-of-Freedom Permanent Magnet Synchronous Motor
Li Zheng1, Chen Qiushuo1, Wang Qunjing2
1. School of Electrical Engineering Hebei University of Science and Technology Shijiazhuang 050018 China; 2. National Engineering Laboratory of Energy-Saving Motor & Control Technique Anhui University Hefei 230601 China
Abstract：the spherical shell rotor is contained in the multi-degrees-of-freedom permanent magnet synchronous motor. When the rated speed of motor is close to the critical speed, the motor will generate multiple resonances, which will affect the normal operation of the motor. The rotor must pass through the first-order critical speed and work at the safety range between 1-order and 2-order critical speed. According to the dynamic characteristics of rotor system, a mathematical model of rotor under free state is established, and the results of the finite element method and the analytic method are compared and analyzed. The influence of rotor gyroscope effect on critical speed is analyzed, and the finite element verification of whether the rigidity of rotor material affects the critical speed, which is also carried out. The relationship between bending modal and deformation displacement is tested under different rigidity conditions. The relationship between the rotational speed and the vibration amplitude of the spherical rotor is verified by experiments, and the corresponding rules are summarized, which provides the theoretical reference and data for the optimal design and control of this kind of motors.
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2019, Vol. 34 
