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PROTECTION OF MOTOR DRIVE SYSTEMS FROM CURRENT SENSOR FAULTS

机译:通过电流传感器故障保护电机驱动系统

摘要

Methods and apparatus are provided for detecting a phase current sensor fault in a multi-phase electrical motor. The method comprises, receiving an input torque command T* and measuring a set of feedback signals of the motor including a phase current Ix for each of the phases of the motor, generating direct and quadrature command phase currents Id*, Iq* for the motor corresponding to a value of the input torque command T*, determining a total command current Is=[(Iq*)2+(Id*)2]½, generating a negative sequence current Ineg, where for three phases Ineg=(⅓)[Ia+(α2)Ib+(α)Ic], where α=ej2π/3, combining Ineg and Is to provide a normalized negative sequence current Inn=Ineg/Is, comparing the normalized negative sequence current Inn to a predetermined threshold value INN* to determine the presence of a phase current sensor fault, and executing a control action when InnINN*.
机译:提供了用于检测多相电动机中的相电流传感器故障的方法和装置。该方法包括:接收输入转矩命令T *,并测量电动机的一组反馈信号,包括用于电动机的每个相的相电流Ix,为电动机生成直流和正交命令相电流Id *,Iq *对应于输入转矩指令T *的值,确定总指令电流Is = [(Iq *)2+(Id *)2] 1/2,生成负序电流Ineg,其中三相Ineg =(⅓) [Ia +(α2)Ib +(α)Ic],其中α=ej2π/ 3,结合Ineg和Is以提供归一化的负序电流Inn = Ineg / Is,将归一化的负序电流Inn与预设阈值INN *进行比较确定是否存在相电流传感器故障,并在Inn> INN *时执行控制操作。

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