What is the difference between armature torque (Ta) and shaft torque (Ts) called?
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A.
Loss torque
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B.
Rotor resistance torque
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C.
Electrical torque
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D.
Eddy current torque
Correct Answer:
A. Loss torque
Explanation:
In a DC motor, the gross electromagnetic torque generated within the armature is not entirely available at the output shaft because a portion is consumed to overcome internal mechanical and magnetic resistances. The discrepancy between this total armature torque (Ta) and the useful shaft torque (Ts) is known as lost torque. This reduction is primarily caused by iron losses (hysteresis and eddy currents) and mechanical friction (bearings, brushes, and windage). Consequently, shaft torque represents the actual torque available for performing mechanical work and is always slightly less than the torque developed in the armature.
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