In induction motor no-load test, the no-load losses usually include the stator copper loss, iron loss, the friction, and the windage losse, and the stray loss, and the rotor aluminum loss often is ignored. In this paper, a new method that separates the rotor aluminum loss from the no-load losses is mentioned. Although, in IEEE Standard 112 and IEC34-2, the rotor aluminum loss is neglected in no-load test. However, in proposed method, the rotor aluminum loss is considered as an important part of the no-load loss. Therefore, this paper intends to develop a new testing method to obtain the rotor aluminum loss under no-load condition. In this case, six induction motors of the same kind (3 kW, four-poles) are chosen to carry out no-load and ideal no-load tests. Through the comparative analysis of experimental data, the no-load rotor aluminum loss accounts for about 13.4% of the no-load loss, and the test approach can also explain that this part loss is not generated by higher harmonics. Based on these results, this paper demonstrates that the rotor contact resistance has great influence for the no-load rotor aluminum loss, and a rotor resistance analysis model with rotor contact resistance is proposed. Final, the proposed method offers the possibility of taking measures on rotor resistance to improve motor efficiency. © 2021 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC.

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异步电动机空载损耗及转子接触电阻的研究

在异步电动机空载试验中，空载损耗通常包括定子铜损、铁损、摩擦、风阻损耗和杂散损耗，而转子铝损常被忽略。在本文中，提到了一种将转子铝损耗与空载损耗分开的新方法。尽管在 IEEE 标准 112 和 IEC34-2 中，转子铝损在空载测试中被忽略了。然而，在所提出的方法中，转子铝损耗被认为是空载损耗的重要组成部分。因此，本文拟开发一种新的测试方法来获取空载条件下的转子铝损。在这种情况下，选择了六台同类（3 kW，四极）感应电机进行空载和理想空载测试。通过对实验数据的对比分析，空载转子铝损约占空载损耗的13.4%，测试方法也可以说明这部分损耗不是由高次谐波产生的。基于这些结果，本文论证了转子接触电阻对空载转子铝损耗的影响很大，并提出了一种带转子接触电阻的转子电阻分析模型。最后，所提出的方法提供了对转子电阻采取措施以提高电机效率的可能性。© 2021 日本电气工程师学会。由 Wiley Periodicals LLC 出版。本文论证了转子接触电阻对空载转子铝损的影响很大，提出了一种带转子接触电阻的转子电阻分析模型。最后，所提出的方法提供了对转子电阻采取措施以提高电机效率的可能性。© 2021 日本电气工程师学会。由 Wiley Periodicals LLC 出版。本文论证了转子接触电阻对空载转子铝损的影响很大，提出了一种带转子接触电阻的转子电阻分析模型。最后，所提出的方法提供了对转子电阻采取措施以提高电机效率的可能性。© 2021 日本电气工程师学会。由 Wiley Periodicals LLC 出版。