Appeal No. 1999-0893
Application No. 08/683,236
stator yoke teeth are mounted side by side in the direction of
the fixed shaft with each of the first and second inner and
outer stator yokes having a magnet set between them. A barrel
shaped rotor is rotatably supported on the bearing and a
plurality of rotor teeth of the same shape and pitch are
provided on the outer and inner circumference of the rotor.
Claim 1 is reproduced as follows:
1. A hybrid-type stepping motor comprising a bearing mounted
on a fixed shaft, a barrel rotor rotatably supported by the
bearing, a plurality of rotor teeth provided on the outer
circumference and inner circumference of the barrel rotor,
first and second inner stator yokes arranged side by side in
the direction of the fixed shaft with a magnet set
therebetween and first and second outer stator yokes arranged
side by side in the direction of the fixed shaft with the
magnet set therebetween, a plurality of stator yoke teeth,
first through fourth axially centered circular coils slots
facing the barrel rotor and formed around the outer
circumference of the first and second inner stator yokes and
the inner circumference of the first and second outer stator
yokes, and first through fourth coils wound in a solenoid
fashion and seated in the respective coil slots, whereby the
stator yokes alternate in polarity and the barrel rotor is
interposed between the coils;
wherein said magnet set comprises a first magnet
interposed between the fixed shaft and the inner stator yokes
and a second magnet interposed between the outer stator yokes
and the outer wall of the fixed shaft, whereby the magnets
face towards each other via the barrel rotor; and
wherein the plurality of rotor teeth provided on the
outer and inner circumference of the barrel rotor are of the
2
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