Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1998-02-17
2000-12-26
Ramirez, Nestor
Electrical generator or motor structure
Dynamoelectric
Rotary
310198, 310178, 310 74, H02K 304, H02K 300, H02K 347
Patent
active
061664723
ABSTRACT:
A flywheel energy conversion device provides highly efficient conversion between kinetic and electrical energy. The flywheel produces increased output by providing armature coils in an air gap formed about the flywheel (both radial and axial embodiments are described). In preferred embodiments, field coils of a magnetic circuit are energized with DC drive current that creates homopolar flux within a rotating solid rotor having teeth cut from a flat disk. The total reluctance of the magnetic circuit and total flux remain substantially constant as the rotor rotates. The flux may travel radially outward and exit the flat disk through the teeth passing across an armature air gap. Airgap armature coils are preferably utilized in which the changing flux density (due to the rotating teeth) induces an output voltage in the coils. The flux is diffused before returning to the rotor in one of several ways such that core losses are effectively reduced, thereby enabling the flywheel to operate efficiently at high frequencies.
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Rinehart, R.E., "A Flywheel Energy Storage Propulsion System for Intra Urban Buses," 1980 Flywheel Technology Symposium, Oct., 1980, Scottsdale, Arizona, pp. 145 to 149.
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Little Scott R.
Pinkerton Joseph F.
Active Power Inc.
Morris Robert W.
Ramirez Nestor
Straub Stephen T.
Tamai Karl
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