Figure shows a two-phase hybrid stepping motor with castleated poles on the stator. The rotor is shown in the position it occupies when current is flowing into the positive lead of phase 1.

a. If phase one is turned off and phase 2 is excited with current flowing into its positive lead, calculate the corresponding angular rotation of the rotor. Is it in the clockwise or counterclockwise direction?

b. Describe an excitation sequence for the phase windings which will result in a steady rotation of the rotor in the clockwise direction.

c. Determine the frequency of the phase currents required to achieve a rotor speed of8r/min.

Transcribed Image Text:

10 Stator South poles at far end of the rotor North poles at near end of Phase I9 the rotor Phase 2 Rotor Stator