基于电流斜率的开关磁阻电机转矩脉动研究
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摘 要：针对开关磁阻电机中低速运行时存在转矩脉动较大的问题，提出了一种固定开关频率的电流预测控制策略，以提高电流动态跟踪能力，实现电机恒转速控制.根据电磁关系估算当前控制周期内绕组施加正压、负压和零压时电流斜率，预测当前周期电压占空比，实现对绕组电流的精确控制.仿真与实验结果验证该电流预测控制策略的可行性，表明该方法具有较快的动态响应性能，在低速情况下能很好跟踪参考电流，较好地抑制了电机的转矩脉动和电磁噪声.
关键词：开关磁阻电机;电流预测控制;电流斜率法;转矩脉动
中图分类号：TM352 文献标志码：A
Research on Torque Ripple of Switched Reluctance
Motor Based on Current Slope
LI Mengqiu ，WANG Wenbing，LI Bo，CAI Hui，SHEN Shiqi
（College of Electrical and Information Engineering，Hunan University，Changsha 410082，China）
Abstract：Aiming at the problem of large torque ripple in low speed operation of switched reluctance motor， this paper presented a current predictive control strategy of fixed switching frequency to improve the current dynamic tracking ability and to realize the constant speed control of the motor. According to the electromagnetic relationship， the current slope of positive current， negative voltage and zero voltage in the current control cycle is estimated， and the duty cycle of the current cycle is predicted， so that the winding current can be precisely controlled. The simulation and experimental results verify the feasibility of the current predictive control strategy. It shows that the proposed method has a fast dynamic response and can track the reference current very well at low speed， which can restrain the torque...
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