Page 292 - Solutions Manual to accompany Electric Machinery Fundamentals

SOLUTION For 3-phase stepper motors,  e  60  , and for 4-phase stepper motors,  e  45  . Therefore,

Number of poles Mechanical Step Size
3-phase (  60 ) 4-phase (  45 )
e
e
2 60  45
4 30 22.5
6 20 15
8 15 11.25
10 12 9
12 10 7.5

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