Q. The detent torque in a stepper motor is the :

A
Minimum of static torque with phase winding excited
B
Maximum of static torque with phase winding over excited
C
Minimum of static torque with phase winding under excited
D
Maximum of static torque with phase winding unexcited
Solution:

When stepper motor is at standstill (unexcited ), the amount of torque required to overcome its static equilibrium (motor shaft is moved by hand) is called detent torque. Detent torque is only seen when permanent magnets are used in motor construction.

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