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The speed of a separately excited dc motor is given by

  • A.\( (V + I_aR_a)/k\phi \)
  • B.\( k\phi/(V - I_aR_a) \)
  • C.\( V/k\phi I_a \)
  • D.\( (V - I_aR_a)/k\phi \)

Answer: D

Rearranging the circuit equation isolates the speed, and the expression shows the three handles available: the applied voltage, the armature resistance and the flux. Each gives its own method of control with its own drawbacks.

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