Integrated DC link choke and method for suppressing common-mode voltage in a motor drive
US7132812B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 7, 2005 |
| Grant date | Nov 7, 2006 |
| Priority date | — |
| Expiry date | Oct 7, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M1/123
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A motor drive and a choke therefor are disclosed, wherein the choke comprises a magnetic core with an inner leg and two outer legs, and four coils, which may be connected in DC current paths in the motor drive. First and second differential coils are wound around first and second outer legs, respectively; and first and second common-mode coils are wound around the inner leg of the choke. The first and second differential coils smooth the DC current on a DC bus in the motor drive, and the first and second common-mode coils suppress common-mode voltages in the motor drive. Also disclosed is a method for suppressing common-mode voltages in a motor drive.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.