A novel topology to the design of electric motors is presented in which the desired performance characteristics of the motor are introduced as parameters at the beginning of the design process. Electric motors are often designed so that some set of parameters can be controlled during the operation of the motor by a control system e.g. voltage/current, phase delays, variable air gap etc. One of the most important issues in design is the number of parameters that can be independently varied during the operation of the motor. For example, a conventional brushed DC motor has only one parameter, voltage (or current) that can be varied. Three-phase AC motors have three parameters - voltage and two phase delays - so their speed-torque profiles can be modified to an extent during the motor operations. Attempts to create motors with 7, 11 or even a larger number of phases have delivered only marginal improvements in motor performance. The main problem is that these parameters are not truly independent for the conventional geometries of the motors. First, the geometry of the magnetic path of the motor is discussed. A new approach to segmented magnetic path design is introduced which permits a large number of independent parameters to be created and controlled. These parameters can be actively controlled during motor operations, enabling optimization of a large number of performance goal functions. Second, the design of a unique control system is discussed which optimizes the advantages of magnetic path design. Due to the design topology, specific electromagnet pole shaping was introduced in order to optimize the torque signature and reduce the unwanted cogging torque profile of the motor. This was achieved using materials, which were specifically shaped to provide the required magnetic flux path in segmented electromagnet sections. Based on this technology, two example machines are presented in this paper.


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    Titel :

    Low-speed high-torque brush less PM motor for propulsion applications with an advanced magnetic path design


    Weitere Titelangaben:

    Bürstenloser Permanentmagnet-Antriebsmotor mit hohem Drehmoment bei geringen Geschwindigkeiten mit neuartiger Magnetfeldführung


    Beteiligte:
    Harrington, R.J. (Autor:in) / Maslov, B.A. (Autor:in) / Pyntikov, A.V. (Autor:in) / Soghomonian, Z. (Autor:in)


    Erscheinungsdatum :

    2002


    Format / Umfang :

    17 Seiten, 9 Bilder, 1 Tabelle, 5 Quellen


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Datenträger


    Sprache :

    Englisch