Circuit arrangement for operating an electrical machine
US7027315B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 28, 2002 |
| Grant date | Apr 11, 2006 |
| Priority date | — |
| Expiry date | Feb 3, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P6/28
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A circuit arrangement for operating an electrical machine having an inductive component. The circuit arrangement includes an electrical switch (TR1 through TR6) that applies a pulse-shaped signal (S1 through S4) to the electrical machine. The free-running circuit also includes an electrical switch (TR1 through TR6). A comparator (15) is provided which compares the free-running current flowing in the free-running circuit with a predefined threshold value and, if the current drops below the threshold value, provides a switching signal (S3A) that is used to deactivate the switch (TR1 through TR6) in the free-running circuit. The circuit arrangement reduces both the electrical power loss in the circuit arrangement and the mechanical power loss in the electrical machine.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.