A Separation Method of Rotor Flux Density Harmonics Based on DFT and Fine Analysis Rotor Iron Losses in Inverter-Fed Induction Motors
Zhang Dongdong1, Guo Xinzhi2, An Ruichi1, Bu Lixiao1, Li Haifeng3
1.School of Electrical Engineering Xi’an Jiaotong University Xi’an 710049 China;
2.Electric Power Economic Research Institute of State Grid Henan Electric Power Company Zhengzhou 450052 China;
3.Shandong Electric Power T&T Engineering Company Ji’nan 250000 China;
Effected by the harmonics from supply and induction motors, the distribution characteristics of iron losses, especially rotor iron losses, become more complicated in converter-fed induction motors. Accurate prediction and fine analysis of iron loss are very important at the design stage of high-efficiency inverter-fed induction motor. However, identification of rotor flux density harmonics is very difficult. This low-frequency signal contains dozens of power supply cycles simulation data, which causes discrete fourier transforming (DFT) cannot be directly used to computed the rotor flux density harmonics. In order to solve those problems, this paper first proposes a new method to identify rotor flux density harmonics using data from a single supply cycle; by using piecewise parameter iron loss model, the variation characteristics of rotor iron loss and the spatial distribution of hysteresis and eddy current losses in variable frequency induction motor are obtained under various operating conditions. The achievements provide important theoretical support for the design of high-efficiency inverter-fed induction motors.
张冬冬, 郭新志, 安睿驰, 卜立萧, 李海峰. 基于DFT的感应电机转子谐波磁通密度高效分离方法及负载条件下变频电机转子铁耗特性[J]. 电工技术学报, 2019, 34(1): 75-83.
Zhang Dongdong, Guo Xinzhi, An Ruichi, Bu Lixiao, Li Haifeng. A Separation Method of Rotor Flux Density Harmonics Based on DFT and Fine Analysis Rotor Iron Losses in Inverter-Fed Induction Motors. Transactions of China Electrotechnical Society, 2019, 34(1): 75-83.
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2019, Vol. 34 
