DS200TCQAG1BHF数字量扩展模块

产品标题:DS200TCQAG1BHF数字量扩展模块

型号： DS200TCQAG1BHF

品牌：GE

                                                                产品详情资料：

当电机运行时，转子以接近同步的速度沿正序电流的方向旋转。负序电流的相位旋转与正序电流相反（因此，与转子旋转相反），产生转子电压，产生大量转子电流。该感应电流的频率约为线路频率的2倍：50Hz系统为100Hz，60Hz系统为120Hz。在该频率下，转子棒中的趋肤效应导致转子电阻***增加，因此转子加热***增加。电机制造商提供的热极限曲线中未考虑这种额外的加热，因为这些曲线仅假设电源和电机设计完全平衡的正序电流。

                         产品英文详情资料：

When the motor is running, the rotor rotates in the direction of the positive-sequence current at near synchronous speed. Negative-sequence current, with a phase rotation opposite to positive-sequence current (and hence, opposite to the rotor rotation), generates a rotor voltage that produces a substantial rotor current. This induced current has a frequency approximately 2 times the line frequency: 100 Hz for a 50 Hz system or 120 Hz for a 60 Hz system. The skin effect in the rotor bars at this frequency causes a significant increase in rotor resistance and therefore a significant increase in rotor heating. This extra heating is not accounted for in the thermal limit curves supplied by the motor manufacturer, as these curves assume only positive-sequence currents from a perfectly balanced supply and motor design.

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