The software outputs to a 5V stepper motor the sequence 5,6,10,9,5,6,10,9… such

Question

The software outputs to a 5V stepper motor the sequence 5,6,10,9,5,6,10,9… such that one new output occurs every 1 ms. With this pattern, the stepper motor spins clockwise at 100 RPM. What will be the consequence of increasing the stepper motor voltage from +5V to +6V?
A) The motor will spin counterclockwise at the same speed and torque.
B) The motor will spin faster.
C) The motor will spin slower.
D) The motor will spin at the same speed, but with increased torque.
E) There will be no change in speed or torque.

Explain your choice.

Explanation / Answer

Answer is d) The motor will spin at the same speed, but with increased torque.

Torque is related to the electrical power applied. Since R is fixed, the power is related to voltage squared. Increasing from 5 to 6 volts increases power by a factor of 36/25, which is 1.44.So, the torque will increase by about 44%.

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