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Reluctance Torque Utility for Line-Starting Permanent Magnet Motors

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5 Author(s)
Takahashi, A. ; Hitachi Res. Lab., Hitachi, Ltd., Hitachi, Japan ; Kikuchi, S. ; Mikami, H. ; Ide, K.
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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 PN = 5 kW, nN = 3000 min -1, VN = 200 V, and Y-connection.

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Energy Conversion, IEEE Transactions on  (Volume:28 ,  Issue: 4 )