Method for determining the instantaneous winding temperature of the stator winding of a three-phase AC motor, in particular a pole-changeable asynchronous motor
US6434505B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 16, 2000 |
| Grant date | Aug 13, 2002 |
| Priority date | — |
| Expiry date | Jan 6, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H7/0852
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The invention relates to a method for determining the winding temperature (TW) of the stator winding of a three-phase AC motor, in particular a pole-changeable asynchronous motor. For determining the winding temperature (TW) of the stator winding of three-phase AC motors that have an unfavorable ratio of the active power to the dissipation power and react sensitively to temperature changes and changes in a main voltage, and for readily determining the heat dissipation power (PV) from the winding temperature (TW) of the stator winding, it is proposed to determine the reference temperature (TG) and the motor current (IM) simultaneously at consecutive points in time, and to determine the winding temperature (TW) by calculating step-by-step sequentially the change in the winding temperature (TW) at a point in time (tn) and adding this change to the winding temperature (TW) of the immediately preceding point in time (tn−1). The change of the winding temperature (TW) associated with a point in time (tn) is proportional to the electrical heat dissipation power (PV) that is converted into heat in the stator winding at the point in time (tn) and to the temperature difference between t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.