Question

A single-stack, 8-phase multipolar, stepper motor has 6 rotor teeth. The phases are excited one at a time. Find the step size.
1. 25°
2. 5°
3. 15°
4. 10°

Answer 1

Correct Answer - Option 3 : 15°

Concept:

Step angle of a stepper motor can be given as

θs = 360 / S

S = m Nr

m = number of phases

Nr = number of rotor teeth or poles

Calculations:

Given

m = 8, Nr = 3 (multiploar)

θs = 360 / (8 × 3)

θs = 15°