GATE EE 2014 Set 3 — Question 23
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Electrical Machines → DC Machines → Generator & Motor Characteristics
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Question
The no-load speed of a V separately excited dc motor is rpm. The armature resistance drop and the brush drop are neglected. The field current is kept constant at rated value. The torque of the motor in Nm for an armature current of A is ____________.
Correct answer
12.45 to 12.65
Solution
Given:
Supply voltage V
No-load speed rpm
Armature current ASince armature resistance and brush drop are neglected, the back EMF is equal to the supply voltage :The relationship between back EMF and angular speed is:No-load angular speed is:The motor constant is:The electromagnetic torque is given by:The official answer range is to .
Supply voltage V
No-load speed rpm
Armature current ASince armature resistance and brush drop are neglected, the back EMF is equal to the supply voltage :The relationship between back EMF and angular speed is:No-load angular speed is:The motor constant is:The electromagnetic torque is given by:The official answer range is to .
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