Title:
A METHOD OF LINEARIZING THE PERFORMANCE OF SWITCHED RELUCTANCE GENERATORS
Document Type and Number:
WIPO Patent Application WO1999013563
Kind Code:
A3
Abstract:
A method of linearizing the output performance of a switched reluctance generator comprises the steps of exciting the switched reluctance generator during a first phase of operation at a turn-on angle which needs not be accurately calculated to produce the desired excitation current. Next, during a second phase of commutation, the switched reluctance generator is freewheeled when a phase current of the switched reluctance generator exceeds a first calculated current level. This freewheeling continues until the phase current of the switched reluctance generator exceeds a second calculated current level, at which point the switched reluctance generator enters the generation phase of its commutation cycle. The linearization of the performance occurs because the first and second calculated current levels are calculated as a function of energy converted per electrical cycle. This function of energy converted per electrical cycle is calculated using an inductance of the switched reluctance generator in an aligned position and an inductance of the switched reluctance generator in an unaligned position. The shape of a graph of the flux linkage versus the phase current is controlled through the selection of the first and second calculated current levels which increases efficiency while linearizing the performance of the switched reluctance generator. The area enclosed by this graph is equal to the energy converted per electrical cycle.
Inventors:
HEGLUND WILLIAM S
Application Number:
PCT/US1998/018835
Publication Date:
May 06, 1999
Filing Date:
September 09, 1998
Export Citation:
Assignee:
SUNDSTRAND CORP (US)
International Classes:
H02P9/40; H02P25/08; (IPC1-7): H02P7/05
Foreign References:
| US5204604A | 1993-04-20 | |||
| EP0736962A2 | 1996-10-09 |
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