Encoder eccentricity correction for motion control systems

Details Encoder eccentricity correction for motion control systems Encoder eccentricity correction for motion control systems

2005-05-04

2009-12-15

Ro, Bentsu (Department: 2837)

Electricity: motive power systems

Positional servo systems

Digital or numerical systems

C318S638000, C318S651000

Reexamination Certificate

active

07633256

ABSTRACT:
Correction of rotary encoder eccentricity in an image forming device having a motor controller using period and position pulse train feedback signals. A motor includes an encoder disc rotating with the motor and at least two encoder sensors disposed at different circumferential positions about the encoder disc. A controller may use a high speed clock to calculate a corrected speed count based on speed counts determined from the number of clock cycles that elapse per cycle of pulse trains from the encoders. The controller may also calculate a corrected position count based at least partly on one or more position counts determined from the number of clock cycles that elapse between periodic sampling points and transitions of encoder pulse trains. The corrected position count may also be calculated based on a position count and one or more speed counts.

REFERENCES:
patent: 6304825 (2001-10-01), Nowak et al.
patent: 7245103 (2007-07-01), Chapman et al.

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