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Synchronous Motors Question

  1. Nov 13, 2011 #1
    Hi all, first post on here.

    I'm an ex-heating engineer studying marine engineering at the moment and are currently covering 3 phase synchronous motors in class. I know from my past experiences that in single phase synchronous motor ( most oftern 3 way valves in domestic heating systems) they use a DC signal to stall the ball in a mid position, using microswitches to alternate between AC and DC using two resistors and a diode.

    My question is, does anyone know of an application of this DC stalling within a larger 3 phase motor? For my own curiosity more than anything else!
     
  2. jcsd
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