【摘要】 转速是评价电机运行状态与控制性能的指标之一，也是阶次跟踪、时变滤波分析等变工况故障诊断的重要参数。提出了一种基于电流信号的PMSM转速估计方法，首先推导PWM调制下永磁同步电机的电流谐波；然后令其与高频信号相乘，通过积化和差的方式解调出与转角误差成正比的零频电流分量，通过PI调节使该电流值为零；最终得到估计转速。实验结果表明：所提方法对于永磁同步电机具有通用性；无须带通滤波器和注入额外电压，电机的振动噪声较小；在稳速和加速工况下能够快速准确地跟踪实际转速，转速误差维持在10 r/min以内；在转速快速突变工况下，相比于阶次跟踪，该方法能够始终跟踪实际转速，实时性和动态性更好。更多还原

【Abstract】 Speed is one of the indexes to evaluate the running state and control performance of the motor, it is also an important parameter for fault diagnosis under variable conditions such as order tracking and time-varying filter analysis. Therefore, a permanent magnet synchronous motor(PMSM) speed estimation method based on current signal is proposed. The current harmonics of permanent magnet synchronous motor with PWM modulation are deduced. Then taking the current harmonics to multiply with the high frequency signal, it demodulates the zero frequency current component which is proportional to the Angle error by the way of integration and difference, and makes the current value zero by PI adjustment and realizes the accurate estimation of speed of permanent magnet synchronous motor. This method doesn’t require band-pass filters and injection of additional voltages, and the noise and current harmonics are small; at the same time, because it is a time-domain method, compared to the order tracking method, it can perform better under conditions where the speed changes rapidly. Finally, the results of simulation and experiment verify the correctness and effectiveness of the method.更多还原