Electricity: motive power systems – Synchronous motor systems – Hysteresis or reluctance motor systems
Patent
1996-11-15
1998-07-28
Masih, Karen
Electricity: motive power systems
Synchronous motor systems
Hysteresis or reluctance motor systems
318254, 318138, 318439, 318798815, 318599, H02P 146
Patent
active
057866813
ABSTRACT:
A method and circuit are disclosed for commutating a conduction cycle of a motor phase of a switched reluctance motor having a rotor portion thereof. The circuit includes a first switching device and a second switching device connected in series with a phase coil. A microcontroller closes both switching devices to connect the coil across a power supply to thereby initiate a conduction cycle. When a current level in the phase coil reaches a threshold level, only one switching device is modulated to control the current level between a local minimum level and a local maximum level. Rise and fall times of the current level between the local minimum and maximum levels are measured and an active phase time ratio is calculated using the rise and fall times. When the ratio, which is indicative of an angular position of the rotor in the switched reluctance motor, reaches a predetermined threshold value, the conduction cycle is commutated.
REFERENCES:
patent: Re35124 (1995-12-01), Erdman et al.
patent: 4611157 (1986-09-01), Miller et al.
patent: 4707650 (1987-11-01), Bose
patent: 4739240 (1988-04-01), MacMinn et al.
patent: 4777419 (1988-10-01), Obradovic
patent: 4928049 (1990-05-01), Pietrobon et al.
patent: 5006772 (1991-04-01), Danby
patent: 5012171 (1991-04-01), Sember
patent: 5012172 (1991-04-01), Sember
patent: 5072166 (1991-12-01), Ehsani
patent: 5084663 (1992-01-01), Olsson
patent: 5097190 (1992-03-01), Lyons et al.
patent: 5116591 (1992-05-01), Stephens et al.
patent: 5247235 (1993-09-01), Tu et al.
"New Commutation Methods in Switched Reluctance Motors Based on Active Phase Vectors," K.R. Ramani and M. Ehsani, 25th Annual IEEE Power Electronics Specialists Conference, vol. 1, 1994, pp. 493-499 (20-25 Jun. 1994).
Dana Corporation
Masih Karen
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