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| Analysis of Radial Electromagnetic Force Characteristics of Inverter Drive Double Skewed Rotor Induction Motor |
| Bao Xiaohua1,2, Ming Shuai1, Chen Guowei1, Liu Jiwei1 |
1. School of Electrical Engineering and Automation Hefei University of Technology Hefei 230009 China;
2. Intelligent Manufacturing Institute of Hefei University of Technology Hefei 230009 China |
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Abstract Inverter power supply is a common method for new energy drive motors, greatly broadening the operating range of induction motors. However, the output voltage of the inverter contains a large number of harmonic components, which will deteriorate the vibration and noise performance of the motor. There have been many related types of research on the vibration and noise of permanent magnet motors and traditional induction motors under the inverter power supply. However, more research must be done on the vibration and noise of double-skewed rotor induction motors (DSRIM) under the inverter power supply. Therefore, this paper has carried out a detailed study on the radial electromagnetic force of the DSRIM driven by an inverter.
Firstly, based on the output harmonic characteristics of the inverter, the air-gap flux density component of the induction motor is analyzed by analytical method, and the expressions of the amplitude, order, and frequency of the radial electromagnetic force are obtained by analyzing the interaction of each flux density harmonic. Then the time-space distribution spectrum of the average radial electromagnetic force is obtained using the multi-slice finite element method and 2-D fast Fourier decomposition. Compared with air gap radial electromagnetic force under different power supply modes and rotor structures, the DSRIM can effectively weaken some of the additional high-frequency radial electromagnetic force introduced by the inverter power supply. Finally, the correctness of the analysis is verified by the vibration experiment of the prototype.
The simulation results of the radial electromagnetic force of the motor under the inverter power supply show that the inverter power supply will not change the spatial order of the radial electromagnetic force. However, it will introduce new frequency force waves mainly concentrated in 3 000~7 000 Hz. The additional radial electromagnetic force wave introduced by the interaction with the additional rotor permeance harmonic and the radial electromagnetic force wave generated by the interaction between the rotor harmonic and the additional stator harmonic can be significantly weakened. The weakening of the radial electromagnetic force wave with the largest amplitude is also the most obvious, decreasing from 1 156 Pa to 60 Pa, decreasing by 1 096 Pa. The experimental results of the prototype show that the motor has significant vibration acceleration at the frequencies of 4 300 Hz, 4 500 Hz, 4 700 Hz, 4 900 Hz, 5 100 Hz, 5 300 Hz, and 5 500 Hz under the inverter power supply, but when the frequency is lower than 4 300 Hz, due to the harmonic weakening effect of the DSRIM, the vibration acceleration spectrum of the DSRIM under different power supply modes is the same.
The following conclusions can be drawn: (1) Inverter power supply will not change the spatial order of radial electromagnetic force but will introduce new high-frequency radial electromagnetic force. (2) The structure of DSRIM does not weaken the radial electromagnetic force generated by the interaction of the main and additional main wave magnetic fields. Moreover, the radial electromagnetic force generated by the interaction of the additional main wave and the saturated harmonic magnetic field will not be weakened. Therefore, there is a large radial electromagnetic force near the switching frequency, which increases the vibration amplitude of the motor at this frequency point. (3) The DSRIM can effectively weaken the radial electromagnetic force generated by the interaction with the additional rotor permeance harmonics introduced by the inverter and the radial electromagnetic force generated by the interaction between the rotor slot harmonics and the additional stator harmonics. Therefore, the vibration characteristics of the motor casing at a place far away from the switching frequency are the same as those of the casing under a sinusoidal power supply.
This paper lays a foundation for further research on noise and fault diagnosis technology of DSRIM driven by an inverter.
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Received: 25 April 2022
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2023, Vol. 38 
