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Consequent-pole permanent-magnet machine with extended field-weakening capability

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3 Author(s)
Tapia, J.A. ; Dept. of Electr. Eng., Univ. of Concepcion, Chile ; Leonardi, F. ; Lipo, T.A.

In this paper a description and operating principles of a consequent-pole permanent-magnet machine are presented. In addition, a sizing analysis, finite-element analysis, and experimental results for a prototype machine are addressed. Due to its particular configuration, this machine allows for a wide range of control of the air-gap flux with minimum field ampere-turn requirements and without brushes or slip rings. Two components of the field flux are produced. One, which is almost constant, is produced by the permanent magnet located on the rotor surface. The other, which is variable, is produced by a field winding positioned circumferentially in the center of the stator. These two flux components converge in the air gap. The excitation level of the machine is manipulated by controlling the DC field current. Three-dimensional finite-element analysis and experimental results demonstrate that it is possible to vary the flux over a wide range to keep the terminal voltage constant as the speed increases. A 3 kW 1000-3000 r/min eight-pole and 32 VAC generator using this configuration is tested to verify the flux control capability of this structure.

Published in:

Industry Applications, IEEE Transactions on  (Volume:39 ,  Issue: 6 )

Date of Publication:

Nov.-Dec. 2003

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