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To reverse the direction of rotation of a shunt-wound DC electric motor, it is necessary to..
  • A
    connect a phase-shift capacitor to the field circuit.
  • B
    reverse the polarity of either the stator or the rotor.
  • C
    do nothing because a DC motor cannot be reversed.
  • D
    reverse the polarity of the motor connections.
A shunt-wound (parallel) DC motor allows a constant low-current flow enabling a constant speed. The main disadvantage of this winding’s configuration is that they produce low torque and cannot be used when high mechanical loads are needed, thus requiring to be started on low loads. In order to change the direction of rotation of a DC motor, the polarity of the voltage needs to be changed. You can simply reverse the polarity of either the stator or the rotor.
 

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