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US 4,584,495 AGranted
Performance step motor
AssigneeApplied Motion Products, Inc.
InventorKenneth S. Kordik
Life of this patent
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AssigneeApplied Motion Products, Inc.
InventorKenneth S. Kordik
Estimating the term…
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.
An electromagnetic step motor having improved damping capabilities, comprising:
In an electromagnetic step motor including a stator having a plurality of stator pole teeth and radially surrounding a rotor including at least one radially symmetrical permanent magnet axially surrounded by an opposing pair of field enhancing pole pieces, the pole pieces having a plurality of rotor pole teeth arrayed opposite the stator pole teeth, wherein a ring shaped zone of the permanent magnet is exposed axially intermediate each pair of stator pole pieces and radially opposite the stator, the improvement comprising:
Dependencies are inferred from the claim text.