Method for controlling an asynchronous machine
US6111386A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 1, 1999 |
| Grant date | Aug 29, 2000 |
| Priority date | — |
| Expiry date | Dec 1, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/72
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method for controlling an asynchronous machine which is operated below a cutoff frequency in the base speed region with variable magnetization current and above a cutoff frequency in a field control speed region is provided. The maximum possible fundamental oscillation of a stator voltage is determined from a existing intermediate circuit voltage or battery voltage and a stator current is defined as a setpoint and impressed onto the asynchronous machine. A calculation is made of a rotor frequency needed, with that definition of the stator voltage to impress the current setpoint. A rotor frequency which corresponds to the current setpoint is compared via a control characteristic curve to the calculated rotor frequency and that rotor frequency value which is the greater of the two is used to determine the current setpoint. The method is advantageously performed with a microprocessor, with which the calculation algorithm may be executed rapidly, effectively, and contemporaneously. Optimum utilization of available energy is thus made possible, in particular for applications in electric vehicles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.