Patent ID: 6788029
Filing Date: 2004-09-07
Classification: H02J,H02K,H02P

Abstract:
A flywheel energy storage system, comprising:an energy storage flywheel supported for rotation on a bearing system; a brushless motor and a brushless permanent magnet generator connected to said flywheel for accelerating and decelerating said flywheel for storing and retrieving energy; a multiplicity of windings magnetically coupled in a plurality of combinations of various numbers of windings for outputting power produced by rotation of said flywheel; an output regulator circuit for providing a variable DC voltage that is maintained within an allowable range for connected loads as the flywheel slows during discharging; said output regulator circuit includes switches for switching connections of said windings to change the number of said windings coupled to said output to maintain said output power DC voltage within said allowable range; said switching occurs less than once per every 10 revolutions of said flywheel.