A signal injection method without torque ripple is presented to estimate the stator winding temperature of a surface-mounted permanent magnet synchronous machine (PMSM), where the temperature is estimated based on the stator resistance. First, the current signal (Δid*) is injected into the current control loop to produce DC current offsets used to calculate the stator resistance, where the injected signal cannot lead to extra torque ripple. Then the temperature can be obtained based on the relationship between the stator winding temperature and the stator resistance. Finally, the proposed method is validated by simulation and experimental results. In addition, no extra equipment is needed for the proposed method.

中文翻译：

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表面贴装永磁同步电机驱动系统定子绕组温度估计的无转矩脉动信号注入方法

提出了一种没有转矩脉动的信号注入方法来估计表面安装永磁同步电机 (PMSM) 的定子绕组温度，其中温度是基于定子电阻来估计的。首先，电流信号 (Δid*) 被注入电流控制回路以产生用于计算定子电阻的直流电流偏移，其中注入的信号不会导致额外的扭矩纹波。然后根据定子绕组温度和定子电阻之间的关系就可以得到温度。最后，通过仿真和实验结果验证了所提出的方法。此外，所提出的方法不需要额外的设备。