Comparisons of Rare-Earth and Rare-Earth-Free External Rotor Permanent Magnet Assisted Synchronous Reluctance Motors
| Autor: | Sai Sudheer Reddy Bonthu, Akm Arafat, Seungdeog Choi |
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| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Electric motor Engineering Stall torque business.industry 020208 electrical & electronic engineering Torque density Mechanical engineering 02 engineering and technology 01 natural sciences 7. Clean energy Wound rotor motor law.invention Direct torque control Control and Systems Engineering Control theory law Harmonics 0103 physical sciences 0202 electrical engineering electronic engineering information engineering Torque sensor Torque Electrical and Electronic Engineering business |
| Zdroj: | IEEE Transactions on Industrial Electronics. 64:9729-9738 |
| ISSN: | 1557-9948 0278-0046 |
| Popis: | This paper presents the comparisons of five-phase external rotor permanent magnet assisted synchronous reluctance motors (PMa-SynRMs) with neodymium (Nd) and ferrite (Fe) based PMs. Five-phase PMa-SynRMs, in general, have been proposed as an alternative to conventional three-phase motors utilized in automobile applications. However, with increased attention towards higher torque density and lower torque pulsations in electric motor designs, five-phase external rotor PMa-SynRMs can be highly attractive. In addition to increased fault tolerance and reliability of five-phase PMa-SynRMs, an adaptation of external rotor design can significantly increase the average torque developed with reduced torque pulsations and back-electromotive force (EMF) harmonics. However, with the design complexity involved in such high performance five-phase PMa-SynRM designs, the shape of flux barrier and choice of PMs have been one of the main challenges. In this study, novel five-phase external rotor PMa-SynRM designs with optimal flux barrier number and shape with Nd and Fe PMs are presented. Finite element simulations are conducted on the 2-D designs to compare their performance characteristics such as torque developed, torque pulsations, structural stability, thermal heat flow, demagnetization effects, and back-EMF harmonics. Optimal 3.8 kW Nd-based and 3.7 kW Fe-based five-phase external rotor PMa-SynRM designs are fabricated, and experimental tests are conducted on the prototypes to compare the results with a benchmark internal rotor PMa-SynRM. |
| Databáze: | OpenAIRE |
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