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The torque equation of a dc motor may be written as

  • A.\( T = P\Phi ZI_a/2\pi A \)
  • B.\( T = 2\pi A/P\Phi ZI_a \)
  • C.\( T = P\Phi ZN/60A \)
  • D.\( T = \Phi I_a/2\pi \)

Answer: A

Both the flux and the armature current appear to the first power, and everything else is fixed by the machine's construction. In practice the relation is used in the shortened form that torque is proportional to the product of flux and current.

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