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unipolar everything is shorted?

Discussion in 'Electronic Design' started by Phil, Jun 7, 2007.

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  1. Phil

    Phil Guest

    Hi, I am connecting a unipolar stepper motor. to check my
    connections, I used a continuity tester. I found out that all the
    wires were shorted!. On further inspection, I found out hte
    centertaps are connected together by my controller board - hence
    shorting all the windings. Is this supposed to happen?
  2. Probably...
    You don't give enough of a description to really be sure. However unipolar
    steppers, in most cases, will have four windings, which all have to be
    connected to the 'common' rail at one end. The commonest configuration
    (actually designed so the motor can also be used in bipola mode), is two
    'pairs' of windings, each with a centre tap, and these taps are connected
    together. The other end of each winding, then goes to the four driver
    sources. The resistance of each winding may be quite low (anything from
    perhaps 200R, on a 'small' motor, down to possiblty 1.5R, on larger
    motors. Most normal 'continuity testers', will see resistances at the
    lower end of this, as a 'short'.
    You need to identify the type of motor, and then get the data sheet, to
    see how the connections are done.

    Best Wishes
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