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

doi:10.19595/j.cnki.1000-6753.tces.171559

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摘要

受供电电源谐波和电机内部谐波磁场的影响,变频电机的损耗机理和分布特性较普通感应电机更加复杂。在高效变频感应电机设计的初始阶段,铁耗的准确预测和特性分析非常重要。由于电机转子侧磁通密度基波频率非常低,因此若直接利用离散傅里叶变换（DFT）分离转子谐波磁通密度成分需要几十个供电电源周期的仿真数据。为了解决这一难点问题,该文首先提出一种仅需要单个供电周期仿真数据的转子侧磁通密度谐波分量的分离方法;然后,利用分段变系数铁耗模型获得了变频供电的感应电机在多种运行条件下转子铁耗变化特性以及变频感应电机转子铁心磁滞和涡流损耗的空间分布规律。该文所得结论可以为高效变频感应电机设计提供一定的理论支撑。

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关键词 ：感应电机, 离散傅里叶变换, 铁耗, 谐波, 转子磁通密度

Abstract：

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.

Key words： Induction motors discrete fourier transforming iron losses harmonic fields rotor flux density

收稿日期: 2017-11-16 出版日期: 2019-01-10

PACS:

TM358

基金资助:

国家自然科学基金（51307050）和中央高校基本科研业务费专项资金（2015ZD03）资助项目

通讯作者: 张冬冬男,1990年生,博士研究生,研究方向为交流电机及其系统能耗分析。E-mail: dongdongzhang@yeah.net

作者简介: 作者简介 : 郭新志男,1989年生,硕士,工程师,研究方向为电网规划、能源互联网规划。E-mail: guoxinzhi@ha.sgcc.com.cn

引用本文:

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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https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.171559 https://dgjsxb.ces-transaction.com/CN/Y2019/V34/I1/75

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