Elevator position compensation system
First Claim
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1. An elevator car position compensation arrangement comprising:
- a car coupled to a motor by means of ropes;
means for driving the motor;
uncompensated signal generating means for generating an uncompensated car position signal; and
compensated signal generating means for generating a compensated car position signal, said compensated signal generating means including instructions and data for generating a car position signal according to the following relationship;
space="preserve" listing-type="equation">Position.sub.n =(True Encoder Position).sub.n -(Commanded Acceleration).sub.n-1 ((K.sub.1 -K.sub.b)/Rise)(Position.sub.n-1)+K.sub.b !Where;
True Encoder Positionn =Current uncompensated/true position from driving machine shaft encoder (e.g., mm)Positionn =Current position reference value based on driving machine encoder feedback used for position control (e.g., mm)Positionn-1 =Previous position reference value based on driving machine encoder feedback (e.g., mm).Rise=Maximum value of Position (where minimum value of Position is zero) (e.g., mm).Commanded Accelerationn-1 =Acceleration most recently commanded by the motion controller to the drive system (meters per second)K1 =Slip and Stretch per unit acceleration expected at the top of the hoistwayKb =Slip and Stretch per unit acceleration expected at the bottom of the hoistway.
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Abstract
An elevator car position compensator includes a compensated position signal generator which, via a closed-loop feed-back arrangement, adjusts a true position signal by using a signal related to dynamic slip and stretch of the hoist ropes.
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Citations
2 Claims
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1. An elevator car position compensation arrangement comprising:
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a car coupled to a motor by means of ropes; means for driving the motor; uncompensated signal generating means for generating an uncompensated car position signal; and compensated signal generating means for generating a compensated car position signal, said compensated signal generating means including instructions and data for generating a car position signal according to the following relationship;
space="preserve" listing-type="equation">Position.sub.n =(True Encoder Position).sub.n -(Commanded Acceleration).sub.n-1 ((K.sub.1 -K.sub.b)/Rise)(Position.sub.n-1)+K.sub.b !Where; True Encoder Positionn =Current uncompensated/true position from driving machine shaft encoder (e.g., mm) Positionn =Current position reference value based on driving machine encoder feedback used for position control (e.g., mm) Positionn-1 =Previous position reference value based on driving machine encoder feedback (e.g., mm). Rise=Maximum value of Position (where minimum value of Position is zero) (e.g., mm). Commanded Accelerationn-1 =Acceleration most recently commanded by the motion controller to the drive system (meters per second) K1 =Slip and Stretch per unit acceleration expected at the top of the hoistway Kb =Slip and Stretch per unit acceleration expected at the bottom of the hoistway. - View Dependent Claims (2)
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Specification
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Current AssigneeOtis Elevator Company (Otis Worldwide Corp.)
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Original AssigneeOtis Elevator Company (Otis Worldwide Corp.)
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InventorsIzard, Jeff, Coste, Steven D.
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Primary Examiner(s)NAPPI, ROBERT E
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Application NumberUS08/575,797Time in Patent Office865 DaysField of Search187/394, 187/393, 187/390, 187/291, 187/293US Class Current187/394CPC Class CodesB66B 1/3492 Position or motion detector...G05B 19/19 characterised by positionin...G05B 2219/41136 Compensation of position fo...
