Method for determining the rotational position of the drive...

Details Method for determining the rotational position of the drive... Method for determining the rotational position of the drive...

2005-02-22

2005-02-22

Nguyen, Vincent Q. (Department: 2858)

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

C324S167000, C318S286000, C318S430000

Reexamination Certificate

active

06859030

ABSTRACT:
A method for determining the position of an element driven along a travel segment by a shaft of a motor includes counting current ripples detected in an armature current signal of the motor as the motor shaft rotates to drive the element. A first time interval between when the motor is turned on with power being supplied to the motor and when the first current ripple is detected is determined. A second time interval between when the last current ripple is detected after the motor has been turned off with the power supplied to the motor being interrupted and when the motor shaft stops rotating is determined. First and second current ripple components corresponding to the first and time intervals, respectively, are estimated. The position of the element along the travel segment is determined based on the counted current ripples and the estimated first and second current ripple components.

REFERENCES:
patent: 4924166 (1990-05-01), Roussel
patent: 5223775 (1993-06-01), Mongeau
patent: 5432421 (1995-07-01), Kessler et al.
patent: 197 29 238 (1997-07-01), None
patent: 197 33 581 (1997-08-01), None
patent: 198 55 996 (1998-12-01), None
patent: 0 603 506 (1993-11-01), None

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