Fast current discharging switch for a variable reluctance motor drive
US4983902A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 1, 1989 |
| Grant date | Jan 8, 1991 |
| Priority date | — |
| Expiry date | Nov 1, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P25/092
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A circuit (40) for controlling a variable reluctance motor in accordance with the invention includes a first switch (Q1) having first and second electrodes, the first electrode being connectable to a first potential (14) of a DC power supply (12) and the second electrode being connected to a first terminal of each phase winding of the motor, and at least one additional switch (Q2-Q4), the first electrode of each additional switch being connected to a second terminal of an associated phase winding and the second electrode of each additional switch being connectable to a second potential (16) of the DC power supply; a number of freewheel diodes (20), a first electrode of each freewheel diode being connected to the second terminal of an associated phase winding and a second electrode of each freewheel diode being connectable to the first potential of the DC power supply; a first diode (24) coupled to the firt terminal of each phase winding; a controller (18) for generating control signals of each of the switches; and a circuit (42) coupled to the first electrode of the first diode, for stopping the current flow in a phase winding connected to the switches being turned off, for generat…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.