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Discussion in 'Electronic Basics' started by Simon Griffiths, Jan 29, 2005.

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  1. Dear All,
    I am currently completing some electronics to go into a
    project and would like to know whether it is possible to control a motor
    (reverse/ forward only) with a Single Pole Double Toggle/Throw (SPDT) relay.
    Thanks for any advice.

    Simon Griffiths.
  2. Andrew Holme

    Andrew Holme Guest

    Only by splitting the power supply.

    You could make a DPDT with 2 SPDT relays.

    Do you want 'stop' as well as 'forward' and 'reverse'? If so, you must use
    2 * SPDT.
  3. If you have a positive and a negative voltage source and a DC motor,
    yes. One side of motor to common, other side to relay common
    contact. One relay contact to positive supply and one to negative

    There are also AC capacitor run motors that can be reversed by
    connecting the capacitor to one winding and the line directly to the
    other that can be configured to reverse with a SPDT contact. You
    connect each end of the cap to each winding, and connect the common
    contact to the line. Then connect each of the other contacts to one
    side of the capacitor. The motor common winding terminal goes to the
    other line.
  4. Si Ballenger

    Si Ballenger Guest

    I've got a diagram of a simple DC motor setup at the below link.
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