Automatic fine tuning of rotor time constant in field-oriented e

Elevator – industrial lift truck – or stationary lift for vehicle – With monitoring – signalling – and indicating means

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187296, 318807, B66B 128, H02P 528

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active

058969543

ABSTRACT:
An elevator controller 7 is provided with logic 48 which automatically calculates a motor time constant (.tau..sub.R) for a field-oriented current regulator/motor drive 20 by running the elevator up and down while computing an average of a sign-adjusted error signal DXD.sub.ERR for the up/down run and while varying .tau..sub.R and determining the value of .tau..sub.R at which the average of DXD.sub.ERR for the up and down runs equals zero within a predetermined tolerance. Alternatively, instead of computing the average of DXD.sub.ERR, a single elevator run may be used to determine the value of .tau..sub.R at which DXD.sub.ERR equals zero within a predetermined tolerance.

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