If a stepper motor has a step-angle of 7.5 ? , what digital input rate is requir

Question

1. If a stepper motor has a step-angle of 7.5? , what digital input rate is required to produce a rotation of 10 rev/sec?
2. What will be the step-angle for a hybrid stepper motor with eight stator windings and ten rotor teeth?
3. How many steps/pulses per second will a microprocessor need to output per second to a stepper motor if the motor is to give an output of 0.25 rev/sec and has a step-angle of 7.5? ?
4. Compare and contrast brush type D.C. motor and brushless D.C. motor. What advantages does brushless motor have over brush type motors?
5. Explain how a thyristor can be used to control the level of a D.C. voltage by chopping the output from a constant voltage supply.

Explanation / Answer

1. 360 degrees / 7.5 degrees = 48 steps/pulses

10 rev/sec * 48 steps/pulse = 480 pulses/ second

2. steps per rev = 8 * 10 = 80 steps/rev

step angle = 360 degrees/80 steps/rev = 4.5 degrees

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