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Effects of broken bars/end-ring connectors and airgap eccentricities on ohmic and core losses of induction motors in ASDs using a coupled finite element-state space method

机译:棒-端环连接器的断裂和气隙偏心率对ASD中感应电动机的欧姆和铁损的影响

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In this paper, effects of rotor abnormalities such as broken squirrel-cage bars, broken cage connectors and airgap eccentricity on ohmic and core losses of induction motors are presented. In this investigation, a comprehensive time-stepping coupled finite element-state space (TSCFE-SS) model was fully utilized to compute the time-domain elemental flux density waveforms and various time-domain waveforms of motor winding currents useful for core loss and ohmic loss computations. Such investigation is feasible by use of the TSCFE-SS model due to its intrinsic nature and characteristics. The results obtained from the simulations of an example 1.2-HP induction motor clearly indicate that faults due to broken squirrel-cage bars/end-connectors can increase motor core losses in comparison to the normal case. The results also give the effect of saturation on the core loss distributions within the cross-section of the motor, and indicate the potential for possible excessive loss concentrations and consequent hot spots near zones of bar and connector breakages in the rotor. Effects of PWM inverter operation on motor losses are also studied.
机译:在本文中,提出了转子异常,如松鼠笼棒断裂,笼式连接器断裂以及气隙偏心率对感应电动机的欧姆和铁心损耗的影响。在这项研究中,充分利用了一个全面的时步耦合有限元状态空间(TSCFE-SS)模型来计算时域元素通量密度波形以及对铁心损耗和欧姆性有用的电机绕组电流的各种时域波形损失计算。由于其固有的性质和特性,使用TSCFE-SS模型是可行的。从示例1.2-HP感应电动机的仿真中获得的结果清楚地表明,与正常情况相比,由松鼠笼杆/端部连接器损坏引起的故障会增加电动机的铁芯损耗。结果还给出了饱和度对电动机横截面内的铁损分布的影响,并指出了可能的过度损耗集中以及由此导致的靠近棒的区域以及转子中连接器损坏的热点的可能性。还研究了PWM逆变器操作对电机损耗的影响。

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