Abstract This paper presents a novel method for elimination of transient torque pulsations of three phase induction motors which arises on direct-on-line (DOL) starting. When started DOL, during run-up period, induction motors produce large transient torque pulsations well in excess of full-load torque. These torque pulsations can be detrimental as it may cause shock-loading on the driven equipment and damage to the mechanical system components such as shaft, gear and couplings. Also, high inrush current is drawn by the motor and this, due to extra temperature rise, may cause winding insulation failure and extra stress on power utilities. With this method faster starting is achieved, which result in faster decaying of inrush currents, and hence reduced stress on both the winding insulation and supply utilities. The method is composed of inserting an optimized and series connected capacitor-resistor pair between the motor and the supply in order to eliminate the low frequency transient components available in the stator and rotor currents, which are the root cause of transient torque pulsations. The proposed method is simulated with full details on two different motors and the results obtained are very satisfactory and promising.

中文翻译：

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一种消除三相异步电动机DOL起动瞬态转矩脉动的新方法

摘要 本文提出了一种消除直接在线（DOL）启动时出现的三相感应电动机瞬态转矩脉动的新方法。启动 DOL 时，在启动期间，感应电机会产生远远超过满载转矩的大瞬态转矩脉动。这些扭矩脉动可能是有害的，因为它可能会对被驱动设备造成冲击载荷，并损坏机械系统组件，例如轴、齿轮和联轴器。此外，电机会吸收高浪涌电流，由于额外的温升，这可能会导致绕组绝缘故障和电力设施的额外压力。使用这种方法可以实现更快的启动，这会导致浪涌电流衰减更快，从而降低绕组绝缘和供电设施的压力。该方法包括在电机和电源之间插入一个优化的串联电容-电阻对，以消除定子和转子电流中可用的低频瞬态分量，这是瞬态转矩脉动的根本原因。所提出的方法在两个不同的电机上进行了完整的模拟，所获得的结果非常令人满意和有希望。