Electricity: motive power systems – Synchronous motor systems – Hysteresis or reluctance motor systems
Reexamination Certificate
2007-12-05
2010-12-14
Benson, Walter (Department: 2837)
Electricity: motive power systems
Synchronous motor systems
Hysteresis or reluctance motor systems
C318S716000, C318S400410
Reexamination Certificate
active
07852038
ABSTRACT:
An improved single-switch control circuit for use in a multi-phase switched reluctance machine is provided. The control circuit includes at least first and second phase windings, a switch, a capacitor, and a diode. The capacitor may have a polarity opposite that of a power source in the control circuit. The first winding may be connected in series with the switch and connected in parallel with a circuit block comprising the second winding. The second winding may be connected in parallel with the capacitor and in series with the diode. In operation, the switch may be used to redirect current from the first winding to the second winding. The capacitor can become charged by the redirected current until it eventually stores enough energy to essentially discontinue current flow in the first winding. Then, the capacitor can discharge its stored energy as a current through the second winding. In this manner, substantially all of the energy from the first winding can be transferred to the second winding.
REFERENCES:
patent: 6140729 (2000-10-01), Pollock et al.
patent: 6166500 (2000-12-01), Makaran
patent: 6781332 (2004-08-01), Kusase
patent: 7015615 (2006-03-01), Ramu et al.
patent: 7271564 (2007-09-01), Ramu
R. Krishnan et al., “Theory and Operation of a Four Quadrant Switched Reluctance Motor Drive with a Single Controllable Switch—The Lowest Cost Four Quadrant Brushless Motor Drive,” 39thIAS Annual Meeting, Conference Record of the 2004 IEEE Industry Applications Conference, vol. 3, Issue 3-7, pp. 1610-1617 (Oct. 2004).
R. Krishnan et al., “Theory and Operation of a Four-Quadrant Switched Reluctance Motor Drive with a Single Controllable Switch—The Lowest Cost Four-Quadrant Brushless Motor Drive,” IEEE Transactions on Industry Applications, vol. 41, No. 4, pp. 1047-1055 (Jul.-Aug. 2005).
PCT Search Report and Written Opinion for International Application. No. PCT/US2008/0009631, mailed Oct. 8, 2008 (5 pages).
Benson Walter
Dickinson Wright PLLC
Glass Erick
Ramu Inc.
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