Automatic fine-tuning of rotor time constant and magnetizing current in field-oriented elevator motor drive
US5909018A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 22, 1997 |
| Grant date | Jun 1, 1999 |
| Priority date | — |
| Expiry date | Dec 22, 2017 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66B19/007
- WIPO fieldHandling
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.