Allowed sloppy magnet placement due to learning control

Bas J. de Kruif, Theo J.A. de Vries

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    Linear motors are typically used in applications that require high speed, high force and high precision actuation. A linear synchronous motor consists of two parts, the moving part and the stationary part. The motor we investigated had permanent magnets fixed on the stationary part. To generate a force, a three phase current has to be applied with a certain phase depending on the position. To increase this force, iron-core coils are used that bundle the flux. The permanent magnets in the stationary part attract these iron which results in cogging forces. The motor has preference positions due to this attraction. By skewing the permanent magnets this effect can be minimized [1], however, at the cost of a smaller peak force. If the magnets are placed with small tolerance and the generated magnetic field would be equal, the cogging force would be periodic. This would mean that the cogging force is known before-hand and can be compensated for. However this would require a set of tightly toleranced magnets that are placed accurately.
    Original languageEnglish
    Title of host publication21st Benelux Meeting on Systems and Control, March 19 – 21, 2002, Veldhoven, The Netherlands
    Subtitle of host publicationBook of Abstracts
    EditorsBram de Jager, Hans Zwart
    Place of PublicationEindhoven
    PublisherTechnische Universiteit Eindhoven
    Number of pages1
    ISBN (Print)90-386-2893-5
    Publication statusPublished - 19 Feb 2002
    Event21st Benelux Meeting on Systems and Control 2002 - Veldhoven, Netherlands
    Duration: 19 Mar 200221 Mar 2002
    Conference number: 21


    Conference21st Benelux Meeting on Systems and Control 2002


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