Method for operating a switched reluctance electrical generator

• US 20030011347A1
• Filed: 08/07/2002
• Published: 01/16/2003
• Est. Priority Date: 02/09/2000
• Status: Active Grant

• Current Assignee: Dana Automotive Systems Group, LLC (Dana, Inc.)
• Original Assignee: Dana Corporation (Dana, Inc.)
• Inventors: Kokermak, James M., Kaplan, Martin, Torrey, David A., Sozer, Yilmaz, Meese, Erkan
• Granted Patent: US 6,819,008 B2
• Time in Patent Office: Days
• US Class Current: 322/24
• CPC Class Codes: H02P 9/40 by variation of reluctance of magnetic circuit of generator

Abstract

A method for operating a switched reluctance electrical generator in a manner that is highly efficient involves initially performing a mapping technique to obtain data relating to all of the possible operating conditions of the generator system that generate the desired output power. This mapping technique can be performed empirically or by computer simulation. Then, the effective phase currents supplied to the windings on the stator are measured or calculated. Next, the optimum conduction angles can be selected as those turn-on angles and turn-off angles that occur using the smallest effective phase currents supplied to the windings on the stator. Lastly, the generator system is operated using the selected optimum turn-on and turn-off angles. If desired, a feedback loop can be provided for comparing the actual output power that is generated by the generator system with a desired reference output power level to insure that such actual output power is maintained at or near the desired output power. To accomplish this, the conduction angles can be adjusted in response to such comparison to increase or decrease the actual output power as necessary.

Claims

1. A method for operating a switched reluctance electrical generator system comprising the steps of:

(a) performing a mapping technique to obtain data relating to a plurality of possible operating conditions of the switched reluctance electrical generator system that generate a desired output power;

(b) determining the effective phase currents supplied to the switched reluctance electrical generator system for each of those possible operating conditions of the generator;

(c) selecting the optimum conduction angles as those conduction angles that occur using the smallest effective phase currents supplied to the switched reluctance electrical generator system; and

(d) operating the switched reluctance electrical generator system using the selected optimum conduction angles.

2. The method defined in claim 1 wherein said step (a) is performed by empirical determination.

3. The method defined in claim 1 wherein said step (a) is performed by computer simulation.

4. The method defined in claim 1 including the further step (e) of comparing the actual output power that is generated by the switched reluctance electrical generator system with a desired reference output power level to insure that such actual output power is maintained at or near the desired output power.

5. The method defined in claim 4 including the further step (f) of adjusting the selected optimum conduction angles in response to said step (e).

6. The method defined in claim 5 wherein said step (f) is performed by adjusting turn-on angles for the selected optimum conduction angles.

7. The method defined in claim 5 wherein said step (f) is performed by adjusting turn-off angles for the selected optimum conduction angles.