Browsing by Subject "harmonic"
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Item Reducing Losses in a 150 kW Vehicular Flywheel Battery(0000-00-00) Flynn, M.M.; Hayes, R.J.Over the past several years a number of technological advancements have been made to improve flywheel energy storage designs. These include the use of high-strength composites, magnetic bearings, and rare earth magnets. Combined, these advances have made possible the consideration of flywheel systems for load leveling and power management on all-electric and hybrid electric vehicles. However, issues remain with heat generation and losses – particularly on the rotor where cooling is available only in the form of radiation – of the high power flywheel systems required for these vehicles. This paper describes how experimental demonstrations have shown that moderate improvements in hardware, software, and control algorithms can dramatically reduce heat generation. This paper (1) identifies and discusses the impact of specific types of losses on overall flywheel performance; (2) provides a discussion of the losses and analysis on the baseline flywheel design; (3) discusses the steps taken to reduce losses in the baseline design; and (4) presents test data taken from the 150 kW vehicular flywheel system. While the flywheel battery system was designed for and demonstrated on a transit bus, the technology described herein is applicable to a wide variety of applications including additional mobile and marine power and propulsion systems.Item Transient performance and loss analysis in solid wound rotor pulsed power generators(IEEE, 2006-02) Davey, K.R.;For magnetic bearing supported flywheels, synchronous power losses can be reduced by proper use of well-established control approaches. Analysis and test results of amplifier and actuator power consumption are presented for several different control schemes: 1) a baseline gain scheduled compensator, 2) an improved compensator with reduced stiffness in the operating range, and 3) the baseline compensator with adaptive open loop control set up to minimize the synchronous currents. To compare the impact of the control changes, power usage and rotor displacement measurements were made on an operating 2.0 kWh flywheel in 2,000 rpm increments from rest to 40,000 rpm. Power consumption was derived from direct measurement of coil currents, coil voltages, and amplifier supply currents using a high-speed digitizer (2 MHz sample rate).