Abstract
In this paper, a wide temperature range permanent magnet synchronous motor (PMSM) is designed, which can be used as the servo mechanism of an electric actuator in a missile. Considering the operating characteristics of the actuator with large environmental temperature change and large temperature rise, the magnetic material characteristics at different temperatures are analyzed, and the influence of eccentric magnetic poles on the cogging torque is deduced. In order to reduce cogging torque in a wide temperature range, the poles of the motor are optimized based on the response surface method. By utilizing temperature rise calculations, the scheme that may exceed the maximum working temperature of the material is eliminated. Then, the response surfaces of the cogging torque with pole arc coefficient, thickness and asymmetry at different temperatures are established, and the optimal value ranges of the three parameters are determined. The minimum upper limits of cogging torque and meeting the specified output torque at different temperatures are used as the judging criteria, and the optimal schemes for different working environments are determined. Finally, a prototype is developed, and the output torque is more than 10 N·m, and the cogging torque is less than 0.2 N·m in a wide temperature range.
Highlights
As the executive body of the missile guidance and control system, the actuator directly determines the dynamic quality of the missile flight process and the final strike effect of the missile
The results indicated that permanent magnet synchronous motor (PMSM) has superiority in wastage compared with induction motors in this environment
When the PMSM works in a wide temperature range environment, it is necessary to consider the effect of temperature changes on the performance of each component material
Summary
As the executive body of the missile guidance and control system, the actuator directly determines the dynamic quality of the missile flight process and the final strike effect of the missile. The model has high accuracy within 25–120 ◦C and can be used for permanent magnets, electromagnetic and thermal analysis of motors These existing studies have obtained some design criteria to ensure that PMSM can work normally and output enough torque in a wide temperature range, but there is still a lack of research on the change of PMSM cogging torque in a wide temperature range. As the main factor of PMSM torque fluctuation, the analysis and reduction in cogging torque in wide temperature range are necessary for improving the accuracy of missile guidance and control. Under the condition that the output torque meets the requirements and the temperature of the motor does not exceed the maximum working temperature of materials, the response surface method is used to obtain the optimal solution of the magnetic pole structure parameters in order to reduce cogging torque.
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