Linear motors ..permanent magnet synchronous linear motors

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hi folks,
i have some interesting work coming up on linear motors. was just wondering if anyone has any extensive knowledge on permanent magnet synchronous motors. i have reviewed alot of work on linear induction motors, but finding it very diffucult to find any work/studies on permanent magnet synchronous linear motors. we are researching their value in linear motion control.
any help greatly appreciated.
Flash.

 

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anybody any ideas of where i can get info of Synchronous permanent magnet LINEAR motors