A hybrid VR stepping motor has 8 main poles, which have been castellated to have 5 teeth each. If the rotor has 50 teeth, calculate the stepping angle.

The correct answer is  option 1):(1.8⁰)

Concept:

•  A hybrid stepper motor is a combination of variable reluctance and permanent magnet-type motors. The rotor of a hybrid stepper motor is axially magnetized like a permanent magnet stepper motor, and the stator is electromagnetically energized like a variable reluctance stepper motor
• The step angle of the stepper motor is defined as the angle traversed by the motor in one step.
• Step angle of the hybrid stepper motor is given by

\(β =\frac{{N_r -N_s}}{{N_s\times N_r}}\times 360^\circ\)

Where

N_s = Number of stator teeth

N_r = Number of rotor teeth

Calculation:

Given that,

N_r = 50

N_s = 8 x 5 = 40

∴ stepping angle can be calculated as

\(β =\frac{{50 -40}}{{50\times 40}}\times 360^\circ\)

β  = 1.8⁰