Automatic fine-tuning of rotor time constant and magnetizing cur

Details Automatic fine-tuning of rotor time constant and magnetizing cur Automatic fine-tuning of rotor time constant and magnetizing cur

1997-12-22

1999-06-01

Nappi, Robert E.

Elevator, industrial lift truck, or stationary lift for vehicle

With monitoring, signalling, and indicating means

Monitors operational parameter

187296, 364150, 318807, B66B 128, G05B 1304, H02P 528

Patent

active

059090189

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 a loss component VDX and while varying .tau..sub.R and determining the value of .tau..sub.R at which VDX for the up and down elevator runs are the same within a predetermined tolerance and which automatically calculates a magnetizing current (Id) by running the elevator in a predetermined direction while calculating a motor voltage Vm and varying Id and determining a new value of .tau..sub.R by performing the up/down elevator run until Vm is within a predetermined tolerance of a target voltage V.sub.T.

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