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The static torque of a drive is the torque required

  • A.to keep the load moving at constant speed
  • B.to accelerate the rotating parts of the drive from rest up to speed
  • C.at the instant of switching on, before the drive has begun to move
  • D.to hold the drive at rest against an active load torque

Answer: A

Correct answer: to keep the load moving at constant speed

The static or steady-state torque is what the load demands once the drive is running at constant speed, with nothing left over for acceleration. It is what determines the continuous rating of the motor. The additional torque needed to accelerate the inertia is the dynamic torque, and the two together make up the motor torque during a start.

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