Average Torque Improvement of Interior Permanent-Magnet Machine Using Third Harmonic in Rotor Shape

Autor:	Wojciech Chlebosz, Grzegorz Ombach, Kai Wang, Zi-Qiang Zhu
Rok vydání:	2014
Předmět:	Stall torque Engineering business.industry Rotor (electric) Cogging torque law.invention Torque limiter Direct torque control Control and Systems Engineering law Control theory Torque sensor Torque ripple Electrical and Electronic Engineering Damping torque business
Zdroj:	IEEE Transactions on Industrial Electronics. 61:5047-5057
ISSN:	1557-9948 0278-0046
DOI:	10.1109/tie.2013.2286085
Popis:	A rotor shaping technique with optimal third harmonic is presented to enhance the average torque of interior permanent-magnet (IPM) machines in this paper. The optimal value of third harmonic injected into the rotor outer surface shape has been derived and further confirmed by both finite-element analyses and experiments. The impact of the optimal third harmonic to the rotor shape on the electromagnetic performance, including harmonics in the back electromotive forces, cogging torque, average torque, and torque ripple, is investigated. It is demonstrated that without any modification of the costly rare earth permanent magnet employed for the inverse-cosine-shaped rotor, the average torque of the machine of an inverse cosine injected with an optimal third-harmonic-shaped rotor can be improved by 6%. Simultaneously, the torque ripple remains almost unchanged, and the saliency ratio is also improved, further boosting the average torque. Finally, the machines with both conventional and optimal third harmonic rotors are prototyped and tested to validate the analysis.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::070bc8d2b8760434b0d2dec19f24c0f3 https://doi.org/10.1109/tie.2013.2286085 Zobrazit plný text záznamu