Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1984-12-17
1986-04-22
Skudy, R.
Electrical generator or motor structure
Dynamoelectric
Rotary
310156, H02K 3700
Patent
active
045844950
ABSTRACT:
The invention is an improved performance step motor (10) including a shorted turn mechanism in the nature of a conducting ring (32) or one or more closed loop conductive strands (50) circumferentially disposed about a ring-shaped exposed magnet zone (48) in the rotor assembly (18) of a conventional hybrid synchronous inductor type step motor. The shorted turn device operates to interact with the magnetic fields created in a rotor magnet (40), a first rotor yoke (42) and a second rotor yoke (44) with the induced magnetic field generated in a stator assembly (24) including a plurality of stator pole pieces (62). The insertion of the shorted turn device results in a balancing of the magnetic fields in such a manner that the oscillation time required to bring the motor to stop at a desired position with standard back phase damping techniques or with no additional damping techniques is substantially reduced. The predominant usage of the present invention is in step motors utilized in data processing applications such as daisy wheel printers and disk drive head positioning devices.
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Warner Electric's Guide to Selecting and Controlling Step Motors; 1979; Warner Elect. Brake & Clutch Co.; Beloit, Wisc.
Applied Motion Products, Inc.
Hughes Michael J.
Skudy R.
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