Automatic fine-tuning of rotor time constant and magnetizing current in field-oriented elevator motor drive

摘要

An elevator controller 7 is provided with logic 48 which automatically calculates a motor time constant ( tau 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 R and determining the value of tau 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 R by performing the up/down elevator run until Vm is within a predetermined tolerance of a target voltage VT.