Electric machine drive having sensorless control
US6603226B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 13, 2000 |
| Grant date | Aug 5, 2003 |
| Priority date | — |
| Expiry date | Oct 14, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K11/21
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A rotor position dependent saliency in a sensorless control electric drive machine (9) introduces a plurality of sensing slots (16) to the outer periphery of a rotor (10). The number, depth, width and location of the sensing slots (16) is chosen to, either directly or through combination with the stator slots (20), create a desired saliency. The use of separate sensing slots (16) results in an effective decoupling between the sensing and torque producing functions in an electric drive motor (9), thereby significantly reducing the potential for ripple torque, clogging torque, or saturation effects. These sensing slots (16) do not have to be skewed if the rotor bars (14) contained within the rotor (10) are skewed; instead they remain parallel to the stator slots (20), resulting in a much larger saliency magnitude.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.