Fault isolation in an induction motor control system
US5469351A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 5, 1994 |
| Grant date | Nov 21, 1995 |
| Priority date | — |
| Expiry date | Jul 5, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H7/1227
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A fault isolation system for a three-phase induction motor drive system includes an inverter to convert direct-current power from a battery into alternating current for the three phases of the motor. The inverter contains six semiconductor switches, two for each phase of the motor, as is conventional in the art of induction motor control. Further, the inverter contains two additional semiconductor switches. These switches form an output connected, via a dummy load in parallel with a third additional semiconductor switch, to the neutral connection of the motor. In the event that any of the six conventional switches in the inverter become short-circuited, the four switches in the other two phases of the inverter as well as the two additional switches are actuated to generate current sufficient to blow a fuse connected in series with the output of the inverter coupled to the short-circuited switch. The motor is thus isolated from the short-circuited switch, preventing the short-circuited switch from totally disabling the motor. An alternative motor drive strategy, such as a two-phase drive strategy, can then be employed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.