Electricity: single generator systems – Generator control – Combined permanent magnet and wound field structure
Reexamination Certificate
2008-04-02
2010-12-28
Ponomarenko, Nicholas (Department: 2839)
Electricity: single generator systems
Generator control
Combined permanent magnet and wound field structure
C310S180000
Reexamination Certificate
active
07859231
ABSTRACT:
A permanent magnet (PM) electric generator with directly controllable field excitation control comprises: a drive shaft; a PM rotor assembly with multiple PMs arranged around an outer axial periphery of the rotor assembly; a stator assembly comprising a ferromagnetic stator yoke, multiple ferromagnetic stator teeth mounted to the stator yoke with distal ends proximate the outer axial periphery of the rotor assembly separated by an air gap and multiple stator coils mounted between the stator teeth; multiple saturable ferromagnetic shunts, each shunt coupling adjacent distal ends of the stator teeth to shunt air gap magnetic flux Φggenerated by the PMs across the air gap through the distal ends of the stator teeth; and multiple saturation control coils, each saturation control coil wrapped about a saturable region of an associated one of the shunts; wherein application of a control current Icto the control coils at least partially magnetically saturates the shunts to reduce shunting of air gap magnetic flux Φg, thereby increasing magnetic flux linkage ΨMbetween the PMs and the stator coils and increasing generated electromagnetic force (EMF) at lower levels of rotor assembly angular velocity.
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Gieras Jacek F.
Rozman Gregory I.
Hamilton Sundstrand Corporation
Mican Stephen G.
Ponomarenko Nicholas
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