Electricity: motive power systems – Positional servo systems – With particular motor control system responsive to the...
Patent
1995-09-29
1998-06-09
Masih, Karen
Electricity: motive power systems
Positional servo systems
With particular motor control system responsive to the...
318696, 318 15, 318560, 318611, 318629, 318129, 318120, G05B 1940
Patent
active
057640181
ABSTRACT:
A system and method for reducing non-repeatable positioning errors. Non-repeatable positioning errors caused by the effects stiction and backlash in the mechanical system are reduced by "shaking" or vibrating the positioning system in a controlled manner. After the system input is set to the desired value, the positioning system is "shaken" by inputting a series of offsets that oscillate around the desired location and gradually decrease in amplitude, eventually reaching zero. In a specific embodiment, a lead screw is threaded through a follower nut which is connected to a magnetic tape read/write head. The lead screw is rotated by a mechanical transmission which provides gear reduction from a computer controlled stepper motor. The tape head's non-repeatable positioning error is reduced by alternately stepping the stepper motor in opposite directions a specified number of steps and periodically reducing the specified number of steps until zero is eventually reached.
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European Search Report for EPO Case 96114735.2 (Hewlett-Packard Company), dated Jan. 27, 1997.
Liepe Steven F.
Richardson Kenneth G.
Hewlett-Packard Co.
Masih Karen
Neudeck Alexander J.
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