What is a Compound motor

This topic contains 5 replies, has 2 voices, and was last updated by John C John C 3 months, 3 weeks ago.

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  • #9895

    Vernon Williams
    Participant

    What is a Compound motor please


  • #9896
    John C
    John C
    Galco Representative

    Hello Vernon thanks for asking.
    A Compound motor is a DC electric motor around here, that has both series and shunt winding’s in it. The series winding is always connected in series with the Armature of a DC motor. The Shunt winding is the same as a standard Shunt wound motor has, stationary winding’s in the Frame of the motor.
    Compound motors are built for added torque under heavy loads, and provide good breakaway torque characteristics for high inertia loads like the Steel Industry has.


  • #9897

    Vernon Williams
    Participant

    Ok so how do you connect 1 of these then?


  • #9898
    John C
    John C
    Galco Representative

    Ahh ok,
    You should have at least 3 pairs of wires unless the Shunt Field is dual voltage rated, then 4 pairs of leads, 2 of which will be for the Shunt Field.
    A1 & A2, S1 & S2, F1, F2, F3, and F4. If the Field is connecting high voltage (usually 300Vdc) then tie F2 and F3 together and connect the Field supply to F1 + and F4 -. Then connect A2 and S1 together, and the A+ from drive to A1, and A- to S2 of the motor, test run for direction of rotation.


  • #9899

    Vernon Williams
    Participant

    Hey John we connected the motor the way you said but it is turning the wrong way how do we correct that?


  • #9900
    John C
    John C
    Galco Representative

    No problem Vernon, you have 2 choices here,
    swap the Armature leads or the Field leads. If you swap the Armature leads it’s heavier wire but there is only 2 of them. If you swap the Field leads you must keep the series field and the shunt field in phase so they don’t buck each other. Swap F1 to – and F4 to +, then S1 and S2 must be swapped also, so connect A2 and S2 together and S1 goes to the A- output terminal of the drive. OK?


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