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标题：基于端电压对称的高速磁悬浮无刷直流电机换相延时误差补偿方法 |
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作者：郭金超，孙津济，陈少华 |
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| 2017年第4期 访问次数：274次 |
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摘要：针对压缩机用高速磁悬浮无传感器无刷直流电机换相误差问题，分析了低通滤波器延时、器件延时、软件延时等对换相的影响，得出了由各种延时导致的换相延时角度的精确表达式，结合换相前后端电压信号变化以及“60°-α”及“120°-α”延时补偿方法，提出了一种基于端电压对称的无刷直流电机换相延时误差补偿方法，该方法以换相表切换为基础，以换相前后端电压对称为目标，将换相前后相电压差值作为反馈量，通过PI调解来减小换相信号的相位误差。仿真及实验表明，所提出的补偿方法在20000 r/min范围内能够有效对换相信号的延时误差进行实时补偿，提高了电机性能。
关键词：磁悬浮；无刷直流电机；无传感器；换相延时；端电压对称
Abstract: This paper analyzed the commutation error of highspeed magnetically suspended brushless DC motor, and analysis of the lowpass filter delay, delay devices, software delay commutation effects showed the delay will cause the exact expressions for the delay angle. Then this paper proposed a new closed loop control method to correct the commutation error based on phase voltage changes before and after commutation and “60°-α”,“120°-α” commutation methods. This method was based on the voltage symmetry of the front end of the commutation, and took the phase voltage integration difference of noncommutation phase as the feedback amount, and corrects the commutation error automatically through the PI regulator. Simulation and experimental results show that the proposed compensation method in 20000 r/min range can effectively swapping believe, compensating the error in real time, improve the performance of the motor.
Key words: magnetically suspended;brushless DC motor; sensorless; commutation delay; voltage of symmetry |
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