Optimization Design of High-frequency Fluctuations of Permanent Magnet DC Torque Motor for Missiles

doi:10.12382/bgxb.2022.0065

Abstract

Abstract:

The permanent magnet DC torque motor is widely used in weapons and equipment field. In order to solve the high-frequency fluctuations of the induced voltage and current of the permanent magnet DC torque motor for missiles, based on the mechanism of high-frequency fluctuations, an optimization design method combining virtual-slot design and optimized brush assembly was proposed for the motor to meet the requirements of high-frequency fluctuation performance index. The virtual-slot can increase the number of reversing elements and decrease the number of turns of elements, thus reducing the reversing current. V-shaped grooves were added to the inner wall of the commutator and the rotor forming process was optimized to facilitate rotor production. The brush assembly optimization includes: brush frame structure optimization, spring leaf optimization, brush head material optimization and optimization of brush breaking-in technique to ensure the coplanarity, pressure consistency and wear reduction of the brush. The optimized motor was simulated and tested experimentally. The results showed that: the proposed optimization design method can effectively suppress the high-frequency fluctuations; the peak-to-peak value of the induced voltage fluctuation of the motor after optimization was reduced by 75.23%, and the peak-to-peak value of the current fluctuation was reduced by 76.77%, allowing the motor to meet the design requirements.

Key words: permanent magnet DC torque motor, high-frequency fluctuation, virtual-slot, brush, induced voltage

WANG Yongjia, GUO Jianning, ZHANG Taopeng, YANG Xiaoqing. Optimization Design of High-frequency Fluctuations of Permanent Magnet DC Torque Motor for Missiles[J]. Acta Armamentarii, 2023, 44(5): 1365-1373.

Figures/Tables 13

References 21

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材料	电阻率/ (μΩ·m)	密度/ (g·mm^-3)	压降/ V	摩擦系数	磨损/ mm
J325	4~10	2.58~2.62	1.5~2.5	≤0.20	≤0.5(25h)
J350	1.5~5.0	3.0~3.5	1.0~1.5	≤0.25	≤0.7(50h)
J360	0.7~1.0	3.0~4.0	0.8~1.2	≤0.25	≤1.4(50h)

材料	电阻率/ (μΩ·m)	密度/ (g·mm^-3)	压降/ V	摩擦系数	磨损/ mm
J325	4~10	2.58~2.62	1.5~2.5	≤0.20	≤0.5(25h)
J350	1.5~5.0	3.0~3.5	1.0~1.5	≤0.25	≤0.7(50h)
J360	0.7~1.0	3.0~4.0	0.8~1.2	≤0.25	≤1.4(50h)

测试项目	电机	实验序号
测试项目	电机	1	2	3	4	5
高频电压/V	实槽电机	5.87	4.55	5.81	3.44	5.08
	虚槽电机	2.08	1.92	1.84	2.28	2.0
高频电流/mA	实槽电机	480	434	512	300	560
	虚槽电机	198	168	156	212	220

测试项目	电机	实验序号
测试项目	电机	1	2	3	4	5
高频电压/V	实槽电机	5.87	4.55	5.81	3.44	5.08
	虚槽电机	2.08	1.92	1.84	2.28	2.0
高频电流/mA	实槽电机	480	434	512	300	560
	虚槽电机	198	168	156	212	220

电机序号	高频电压/V		高频电流/mA
电机序号	优化前	优化后	优化前	优化后
1	2.08	1.30	198	100
2	1.92	1.17	168	101
3	1.84	1.26	156	108
4	2.28	1.28	212	102
5	2.00	1.12	220	120