Question

In a three stack 12/8 pole variable reluctance motor, rotor pole pitch is
1. 15°
2. 30°
3. 45°
4. 60°

Answer 1

Correct Answer - Option 3 : 45°

Concept:

Let N be the number of rotor poles (or teeth) and m is the number of stacks or phases. Then

Pole pitch = 360° / N

Step angle = 360° / (m × N)

Calculation:

In a three-stack 12/8 pole variable reluctance motor,

Number of rotor poles = 8

Pole pitch = 360/8 = 45°