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5.6 Stepping Motors for Position Control Applications 99
motors. Therefore, the stability of stepping motors must carefully investigated. The
torque equation similar to DC servo motors becomes
T : = K I⋅ (5.15)
t
m
The equation of motions for rotor and load are similar to that described for DC
servo motors. The reader is encouraged to obtain a catalogue from stepping motor’s
manufacturer and study the dynamic behavior of stepping motors in closed position
control applications at various complexities. The effect of velocity feedback which
is easily available must be studied. For more complex applications, the state vari-
ables feedback as described in DC servo motors should also be investigated.
