Electrical machine drive method and system
US6683435B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 21, 2002 |
| Grant date | Jan 27, 2004 |
| Priority date | — |
| Expiry date | Jun 21, 2022 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60L3/0023
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
An electrical machine drive system (100) includes a DC power source (102), an inverter (104) and a three-phase electrical machine (106). In response to a fault condition, power switches (122, 124) in the inverter are opened. Any short circuits are then determined by examining the phase currents of the three-phase electrical machine. If short circuits are found in the inverter, then the inverter is made balanced by shorting all upper braches (122, 126) or all lower branches (124, 128), depending on the location of the short circuit. Torque ripples are avoided by balancing the circuit during the fault mode, thereby providing comfort to a user of an electric or hybrid electric vehicle employing the electrical machine drive system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.