Dana Corporation, Warner Electric Brake & Clutch Division

John Frus

John S Baer

William R Coon

An axial pole stepping motor having a stator assembly on one or both sides of a disc-shaped rotor and including a plurality of teeth extending parallel to the rotational axis of the motor's drive shaft with the teeth arranged into at least two groups and evenly spaced within each of the two groups such that the teeth of each group may be axially aligned with the north-south poles of the permanent magnets evenly spaced about the circumference of the rotor. The two groups of teeth are circumferentially offset from each other such that the teeth of both groups cannot be simultaneously aligned with the north-south poles of the rotor. The circumferential offsetting of the two groups defines a stepping angle for the rotation of the motor shaft. A continuous skein winding woven in a labyrinth pattern between and among the teeth of each group transforms the teeth into salient poles. The windings may be energized in several modes. In order to provide stability in all modes of energization, at least one extra tooth not associated with the windings can be provided in the circumferential intergroup gap separating adjacent groups of teeth in the single stator assembly.

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Jacksonville, FL, United States of America

John Frus