电工技术学报2025，Vol.40Issue(18)：5776-5785,10.DOI:10.19595/j.cnki.1000-6753.tces.241394
面向超低温工况需求的铁磁材料铁心损耗计算模型与电导率计算方法
Calculation Model and Conductivity Calculation Method for Iron Core Loss of Ferromagnetic Materials for Ultra-Low Temperature Working Conditions
杨志飞 1戈宝军 1董传友 1王立坤 1李广林2
作者信息
- 1. 大型电机与电气传热技术国家地方联合工程研究中心(哈尔滨理工大学) 哈尔滨 150080
- 2. 首钢智新电磁材料研发(北京)有限公司 迁安 064404
- 折叠
摘要
Abstract
The High-speed permanent magnet motors used for transporting liquefied natural gas(LNG)operate in ultra-low temperature environments below-161℃.If the temperature rise of the motor is too high,it can easily cause LNG to vaporize,and the iron loss of the motor is the main factor affecting its temperature rise.Accurately calculating the loss characteristics of iron core materials in ultra-low temperature environments can help analyze the iron loss of the motor.
Electric motors usually use silicon steel sheets as the iron core material.Their iron core losses will inevitably differ between ultra-low and normal temperatures,and their conductivity is challenging to measure in ultra-low temperatures.This paper studies the influence of ultra-low temperatures on the loss characteristics of silicon steel sheets,establishes a calculation model for iron core loss of ferromagnetic materials,and proposes a calculation method for the equivalent conductivity of ferromagnetic materials.Firstly,the SY-8258 magnetic property measurement system is used to measure the losses of silicon steel sheets at room and ultra-low temperatures.Then,a calculation model for iron core loss of ferromagnetic materials is established,and the shortcomings of the traditional model are explained.Furthermore,an improvement is made by introducing the relative loss coefficient and temperature coefficient correction factors.The loss values calculated by this model are compared with the measured values.Secondly,a method for calculating the equivalent conductivity of silicon steel sheets is proposed,and its effectiveness is verified by comparing the calculated and actual conductivity values of silicon steel sheets.This method is applicable to ultra-low temperature conditions and can also calculate the equivalent conductivity of silicon steel sheets at any ambient temperature.It should be noted that the following conditions are to be met:(1)the temperature inside and outside the silicon steel sheet has been kept constant;(2)obtain accurate iron consumption measurement results of silicon steel sheets at the ambient temperature.
The following conclusions are drawn from the results.(1)Under ultra-low temperature conditions,the loss value of silicon steel sheets increases compared to room temperature.(2)The proposed loss calculation model has higher accuracy than traditional loss calculation models,which can calculate the loss of ferromagnetic materials in ultra-low temperature environments.(3)The proposed equivalent conductivity method calculates the equivalent conductivity of silicon steel sheets at room temperature.The results show that the percentage errors between the calculated and actual values are 4.4%and 6.6%,respectively.关键词
液化天然气泵用电机/超低温环境/铁磁材料/铁心损耗计算模型/电导率Key words
Motors for liquefied natural gas pumps/ultra low temperature environment/ferromagnetic material/calculation model for iron core loss/conductivity分类
信息技术与安全科学引用本文复制引用
杨志飞,戈宝军,董传友,王立坤,李广林..面向超低温工况需求的铁磁材料铁心损耗计算模型与电导率计算方法[J].电工技术学报,2025,40(18):5776-5785,10.
