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1. 发明公开

EP1780884A2 Audible noise reduction for single current shunt platform 审中-公开
标题翻译： einem系统中的VerringerunghörbarerGeräusche系统信号传感器
公开(公告)号：EP1780884A2
公开(公告)日：2007-05-02
申请号：EP06022413.6
申请日：2006-10-26
申请人： INTERNATIONAL RECTIFIER CORPORATION
发明人： Ho, Eddy Ying Yin
IPC分类号： H02P21/00
CPC分类号： H02P23/14 , H02M7/53875 , H02M2001/0009 , H02P21/00 , H02P29/50
摘要： A method and system for reducing audible motor noise in a system for reconstructing motor phase current from a DC bus current comprising current pulses on a DC bus in a PWM inverter motor drive system having a PWM cycle, and for controlling the motor, which forms a command voltage vector according to a space vector modulation arrangement for controlling the motor; measures the DC bus current on the DC bus supplying power to the inverter to reconstruct said motor phase current; and determines when the command voltage vector results in an inverter switching state that prevents the measuring of the DC bus current from accurately indicating motor phase current. During said inverter switching state, a current sampling scheduler applies a minimum pulse width constraint to said current pulses in said DC bus current to improve reconstruction of said motor phase current based on said DC bus current; and reduces the application of said minimum pulse width constraint to less than once per PWM cycle imposed by the PWM inverter motor drive system, thereby allowing motor phase current reconstruction with reduced audible motor noise. The current sampling scheduler synchronously samples said measured motor phase current to reduce errors in said measured motor phase current caused by said reduction of said minimum pulse constraint; reduces a bandwidth of said motor controller during said inverter switching state; and is adjustable in response to motor speed for setting the number of said minimum pulse width constraints per PWM cycle.
摘要翻译：一种用于从用于从DC总线电流重建电动机相电流的系统中减少可听见的电动机噪声的方法和系统，其包括具有PWM周期的PWM逆变器电动机驱动系统中的DC总线上的电流脉冲，并且用于控制电动机，根据用于控制电动机的空间矢量调制装置的指令电压矢量; 测量DC总线上的直流母线电流，为逆变器供电，以重构所述电动机相电流; 并且确定命令电压矢量何时导致逆变器切换状态，其防止直流总线电流的测量精确地指示电动机相电流。在所述逆变器切换状态期间，电流采样调度器对所述DC总线电流中的所述电流脉冲施加最小脉冲宽度约束，以改善基于所述DC总线电流的所述电动机相电流的重建; 并且将所述最小脉冲宽度约束的应用减少到由PWM逆变器电动机驱动系统施加的每个PWM周期少于一次，从而允许以较低的可听见的电机噪声来进行电机相电流重建。当前采样调度器同步采样所测量的电动机相电流，以减少由所述最小脉冲约束的所述减小引起的所测量的电动机相电流中的误差; 在所述逆变器切换状态期间减小所述电动机控制器的带宽; 并且可以根据电机速度进行调节，以便设置每个PWM周期的所述最小脉冲宽度限制的数量。

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