The phase windings of the castleated machine of Figure are to be excited by turning the phases on and off individually (i.e., only one phase can be on at any given time).

a. Describe the sequence of phase excitations required to move the rotor to the fight (clockwise) by an angle of approximately 21.4?.

b. The stator phases are to be excited as a regular sequence of pulses. Calculate the phase order and the time between pulses required to produce a steady-state rotor rotation of 125r/min in the counterclockwise direction.

Transcribed Image Text:

60 60 Stator B.B ntynrnnhir 28/3 - 48/3 - Rotor