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Multi-star PM brushless DC motor for traction applications
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| Author(s) |
J. Cros; C. Paynot; J. Figueroa; P. Viarouge |
| Abstract |
A specific drive structure using a brushless PM motor with constant power operation on a wide speed
range is presented. The proposed solution can be applied to specific motor structures which can be
wound with a multi-star winding. Each star winding is using a specific number of turns and is
supplied by a 3-phase inverter. All star-windings are supplied to deliver the highest output torque in
the low speed range but only the star winding with the lowest number of turns is supplied to deliver
the torque in the high speed range. The current can be always maintained in phase with the no-load
emf to maximize the torque to Amp ratio and a simple current control system can be used. The
method is compared to other conventional methods as flux weakening control and maximal torque
control using a single star winding motor. Some design rules of multi-star motors with concentrated or
centralized windings are described. A prototype of fractional power brushless motor with a doublestar
winding and a surface mounted permanent magnet rotor is also presented. It is used to validate the
proposed method with a conventional rectangular current control system. The experimental torquespeed
characteristic confirms the performance of this drive method. |
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| Filename: | EPE2003-PP1080 - Cros |
| Filesize: | 452.3 KB |
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| Type |
Members Only |
| Date |
Last modified 2003-10-30 by Unknown |
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