Reluctance Torque Utility for Line-Starting Permanent Magnet Motors

This paper presents two types of prototype line-starting permanent magnet motors for compressor drives; one is a nonsalient-pole machine, and the other is a salient-pole machine. It is proved through both the analyses and experiments that the utility of reluctance torque not only boosts steady-state...

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Bibliographic Details
Published in:IEEE transactions on energy conversion 2013-12, Vol.28 (4), p.805-814
Main Authors: Takahashi, Akeshi, Kikuchi, Satoshi, Mikami, Hiroyuki, Ide, Kazumasa, Binder, Andreas
Format: Article
Language:English
Subjects:
Line-starting
permanent magnet (PM)
Permanent magnet motors
Prototypes
Reactive power
reluctance torque
Rotors
salient-pole
Steady-state
Torque
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Summary:This paper presents two types of prototype line-starting permanent magnet motors for compressor drives; one is a nonsalient-pole machine, and the other is a salient-pole machine. It is proved through both the analyses and experiments that the utility of reluctance torque not only boosts steady-state characteristics but also line-starting capabilities. It was also noteworthy that the salient-pole machine in the steady-state operation could achieve not only better efficiency but also a higher power factor. Finally, the designed motors achieved a 4% to 5% increase in efficiency over all operational points, which prevented a rise in temperature by 30 K, compared with a conventional two-pole induction motor. The results are given for a two-pole prototype motor with P N = 5 kW, n N = 3000 min -1 , V N = 200 V, and Y-connection.
ISSN:0885-8969
1558-0059
DOI:10.1109/TEC.2013.2281064