特点  
    SIRIUS 3RW40采用拥有权的全新控制技术－“相位平衡”。该控制技术能够防止两项控制软起动器中的直流成分。对于两相控制软起动器 ，来自两个控制相位的电流会流经未受控制的相位。因此，从纯粹的物理角度来看，在电机起动时，三相电流会不对称。这虽然不受影响，但 在大多数应用中仍不可忽视。除了这种不对称性之外，如果在两个控制相位中控制功率半导体器件，则会产生直流成份。在起动电压低于50%时，则会造成电机中出现噪音。“相位平衡”技术则能够可靠避免电机起动时的这些直流成份。它可就转速、转矩和电流增量方面生成统一的电机起动特性。并且起动噪声质量和控制三个相位的起动设备一样。这可通过连续动态调整和均衡电机加速时不同相位的半波电流实现。  ：  /

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