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| Vibration Reduction Method of Switched Reluctance Motor with Amorphous Alloy Cores Based on Inverse-Magnetostriction Effect |
| Ben Tong1, Wang Jin1, Chen Long1, Jing Libing2, Yan Rongge3 |
1. College of Electrical Engineering and New Energy China Three Gorges University Yichang 443002 China;
2. Hubei Provincial Engineering Technology Research Center for Microgrid China Three Gorges University Yichang 443002 China;
3. State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of Technology Tianjin 300130 China |
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Abstract Switched reluctance motors are applied in electric vehicles due to their simple structure and low cost. The amorphous alloy used in the switched reluctance motor core can greatly improve the efficiency of the motor. However, its large magnetostrictive coefficient and strong stress sensitivity (i.e. inverse-magnetostriction effect) will increase the core vibration and limit the precise control ability of electrical signals. Therefore, a new approach is proposed to use the inverse-magnetostriction effect to control the electromagnetic vibration of switched reluctance motors with amorphous alloy cores (SRMA). Then, the compressive stress applied structure of the SRMA stator teeth is proposed. The simulation and experimental results show that the vibration reduction method is feasible.
Firstly, a nonlinear magnetostriction and inverse-magnetostriction effect force-magnetic coupling con- stitutive relation of the amorphous alloy is proposed based on the macroscopic thermodynamics to analyze the vibration of a SRMA. The parameters are measured by magnetic properties measurement system. Thus, the magnetostrictive strain and relative permeability of amorphous alloys with a magnetic field and compressive stress applied can be calculated. Secondly, the compressive stress applied structure of the SRMA is proposed according to the inverse-magnetostriction effect, and a finite element model of the structure is established to verify its stability. Then, according to the extended solution of the electromagnetic stress and magnetostrictive stress, a two-way dynamic electromagnetic-force coupling model of the SRMA considering the magnetostriction and inverse-magnetostriction effects is established. Finally, experiments and finite element calculations are carried out on the vibration characteristics of SRMA. The magnetic flux density in the stator yoke area remained at about 0.3 T before and after the improvement, which shows that the SRMA can still maintain the original running state after the improvement. Furthermore, the finite element calculation results before and after considering the magnetostriction of the SRMA stator are compared. It is shown that the main sources of vibration are magnetostrictive stress and electromagnetic stress. Among them, the proportion of magnetostrictive stress in dynamic stress can reach up to 42.4 %. Besides, after the stator teeth are applied to 24 MPa compressive stress, the radial magnetic flux density near the bolt is significantly reduced due to the force-magnetic coupling, and the radial magnetic flux density and electromagnetic stress in the air gap are reduced by 26.3 % and 44.5 %, respectively. By comparing the experimental and simulation results of the vibration displacement, the spectral distribution is consistent, which verifies the accuracy of the proposed SRMA model.
The following conclusions can be drawn from the simulation and experiment analysis: (1) The proposed force-magnetic coupling constitutive relation of the amorphous alloy can simulate the magnetostriction and the inverse-magnetostriction effect, and the nonlinear effect of stress on the relative permeability of amorphous alloys can be described more accurately. (2) By solving the two-way dynamic electromagnetic-force coupling model of the SRMA, the magnetostriction effect cannot be ignored in the vibration analysis of SRMA. (3) The compressive stress applied structure of the stator teeth can reduce vibrations while maintaining the original operation of the SRMA. It provides a new idea for research on the vibration reduction of SRMAs.
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Received: 02 April 2022
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2023, Vol. 38 
