异步电机转子感应非正弦电流时的导条损耗  

LOSS CALCULATION FOR INDUCTION MACHINE ROTOR BAR WITH NON-SINUSOIDAL CURRENT

作　　者：吴新振[1] 王祥珩[1] 罗成[1] 

机构地区：[1]清华大学电力系统及发电设备控制和仿真国家重点实验室,北京市海淀区100084

出　　处：《中国电机工程学报》2005年第17期131-135,共5页Proceedings of the CSEE

摘　　要：为计算异步电机转子导条流过非正弦电流时的损耗,采用了先分别计算不同频率电流对应损耗再进行叠加的分析方法。该方法基于电路原理而非通过电磁场分析来计及集肤效应对损耗的影响,在对转子导条分层处理并求出相应参数的前提下,推导说明导条流过非正弦电流时的损耗等于分别流过不同频率正弦交流电流时的损耗之和。文中给出算例并计算了不同频率转子电流在该导条中产生的损耗,同时用有限元法直接计算流过实际非正弦电流时的转子导条损耗,比较计算结果验证了损耗所满足的叠加关系。采用叠加方法求取损耗不仅减小了计算工作量,而且能定量计算某一特定频率电流产生损耗大小。To evaluate the rotor bar loss of an induction machine with non-sinusoidal currents, a new analysis approach is proposed. The approach calculates the losses of the currents with different frequencies respectively and, then, adds them together. The method uses the circuit analysis theory instead of electromagnetic field theory to count the skin effect on the bar loss. In the method, a rotor bar is divided into many layers with their own parameters derived. Based on the above theory, it is illustrated why the total bar loss due to the non-sinusoidal current equals the sum of the losses produced by the currents with different frequencies. For a given example, the bar loss produced by each rotor current at different frequencies is calculated. The finite element analysis is also performed to total bar loss calculation with non-sinusoidal current. The analysis verifies the superposition relationship between the respective losses and the total one. By applying superposition principle in rotor bar loss calculation, it not only lowers the computation burden, but also quantitatively determines the loss at a specified frequency.

关 键 词：异步电机 导条损耗 叠加原理 集肤效应 

分 类 号：TM341[电气工程—电机]