Permanent magnet brushless motor drive systems are potential candidates for application in both electric and hybrid-electric vehicles. The base speed of a brushless drive system is governed by the converter VA rating, whilst higher speed operation may be achieved by implementation of field-weakening control techniques, ie by controlling the phase of the stator currents in order to produce the highest torque at each speed within both the dc link voltage and stator current limits. Various approaches to field-weakening have been proposed. However, while these have invariably been applied to brushless ac (ie sinusoidal emf) machines having an interior magnetic topology, the brushless dc (ie trapezoidal emf) format may provide a better techno-economic solution, for at least some automotive applications. Both machine formats may be designed around surface mounted, inset or interior magnet rotors. The paper summarises two analysis techniques which can be applied to aid the design of brushless permanent magnet drive systems, in particular to determine whether a machine can match the power-speed requirement of the load within the converter VA rating constraint.


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    Title :

    Flux weakening of brushless permanent magnet motors


    Additional title:

    Magnetflußschwächung eines bürstenlosen Elektromotors mit Permanentmagneten


    Contributors:
    Schofield, N. (author) / Mellor, P.H. (author) / Howe, D. (author)


    Publication date :

    1992


    Size :

    8 Seiten, 6 Bilder, 3 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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