Abstract
Direct current motor of permanent magnet (PMDCM) is widely used at present. To optimize its operating performance and vibration characteristics, a new PMDCM of rectangular magnetic steel was developed. The co-simulation was conducted based on RMxprt and MAXWELL. The simulation results verify that the output power and torque meet the design requirements. Then the cogging torque of the designed motor was analyzed and optimized by using response surface method. The influence degree of each factor on cogging torque was analyzed. When factor A, the factor B, and factor C are 33.51mm, 2.42mm, and 1.50mm, the root-mean-square (RMS) value and the maximum value of the cogging torque are smallest. The fitting accuracy of the two regression equations of RMS and maximum cogging torque is 94.30% and 97.26%. To further verify the correctness of analysis results, the optimized motor and reference motor were manufactured and the vibration velocity data at different positions were measured. The measured data shows that the maximum and average data of vibration velocity at measuring point 1 are decreased by 18.99% and 19.03% and the maximum and average vibration velocity at measuring point 2 are decreased by 9.73% and 4.70%. The method of vibration reduction is effective. The proposed optimization scheme and method may be extended to other motor for reducing vibration.
Highlights
If the PMDCM is equipped with a speed stabilizer, it can be applied to the occasions where the rotation speed needs to be stable even if the voltage fluctuates
The literature studies show that a large number of researches have been carried out on the cogging torque in previous studies, but the influence degree of magnetic steel parameters of PMDCM on the cogging torque and vibration characteristics has not been clarified
These results suggest that the cogging torque mainly affects the radial force and has little effect on the axial force
Summary
Due to the large centrifugal force of high-speed motor and the low structural strength of the pasted magnetic steel, it is necessary to install permanent magnet sheaths on the medium and high-speed motors [9]–[12]. Zhang: Design and Vibration Optimization of PMDCM of Rectangular Magnetic Steel electromagnetic vibration [13]–[16]. Electromagnetic vibration is primarily caused by the electromagnetic force operating on the stator It affects the accuracy of torque control, and aggravates the vibration and noise of the motor [17], [18]. The literature studies show that a large number of researches have been carried out on the cogging torque in previous studies, but the influence degree of magnetic steel parameters of PMDCM on the cogging torque and vibration characteristics has not been clarified. Previous studies have failed to consider the influence of cogging torque on vibration characteristics of motor at different positions
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