Question

Why armature resistance control method is also called as constant torque control?

Answer 1

Answer:

Armature resistance control method is also called as-----------? Armature resistance control is constant torque drive. The motor shaft torque become constant given over a speed range. If voltage is reduced to half then flux will also be reduced to half because the current flowing through the shunt field is also halved.

Answer 2

Armature resistance control method is also called as constant torque control because this type of resistance control has a constant torque and variable power drive.

• An armature has resistance built in, which limits the surplus current.
• In addition to the built-in winding resistance, a regulating resistance needs be added to regulate the motor's speed.
• The following equation describes the relationship between a motor's back emf and speed:

N ∝ Eb/Ф

N ∝ [V- Iα (Rα+R)] / Ф

• By increasing armature resistance, we can regulate the speed.
• Only below base speeds are produced by this method.
• This approach uses a drive with constant torque and variable power.

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