FDX: a fast discharge homopolar generator
Conference
·
OSTI ID:5182446
A study was undertaken to determine the fundamental limitations to the discharge times of homopolar generators. As a result of the study, a Fast Discharge Experiment (FDX) was proposed. FDX is a small (365 kJ), counterrotating disk type homopolar generator designed to explore the limits to homopolar generator discharge times. The FDX rotors are forged aluminum alloy with flame sprayed copper slip rings. Solid copper graphite brushes are used with a 95% packing factor on the slip rings. The high magnetic field required for fast discharge (3.6 T average) is provided by discharging the CEM 5.0 MJ homopolar generator into a four-turn, graphite-reinforced, room temperature copper coil. Since the field is pulsed and FDX rotors cannot be self motored, they are brought up to speed with two 37 kW air turbines. The two aluminum rotors are 30 cm in diameter and of a rimmed, modified constant stress configuration. They are designed for a maximum operating speed of 28,000 r/min at which point they each store 182.5 kJ and develop 104 V. The aluminum discharge coax is approximately 38 cm in diameter and is designed to carry the 1.88 MA anticipated from a half speed (14,000 r/min) short circuit discharge which would stop the rotors in 1.0 ms. It is predicted that the machine will ring on its own internal impedance for approximately five cycles in this mode. The discharge coax is shorted by four very fast making switches. Additional impedance can be introduced into the discharge circuit by extending the switch coaxes to allow full speed 1.4 MA discharges in approximately 3.5 ms.
- Research Organization:
- Texas Univ., Austin (USA). Center for Electromechanics
- OSTI ID:
- 5182446
- Report Number(s):
- ORO-5594-8; CONF-771132-4
- Country of Publication:
- United States
- Language:
- English
Similar Records
Design, fabrication, and testing of a fast discharge homopolar machine (FDX)
Test data on electrical contacts at high surface velocities and high current densities for homopolar generators
A study pertaining to inertial energy storage machine designs for space applications. Final report
Conference
·
Fri Dec 31 23:00:00 EST 1976
·
OSTI ID:5154042
Test data on electrical contacts at high surface velocities and high current densities for homopolar generators
Conference
·
Fri Dec 31 23:00:00 EST 1976
·
OSTI ID:5153980
A study pertaining to inertial energy storage machine designs for space applications. Final report
Technical Report
·
Sat Aug 01 00:00:00 EDT 1981
·
OSTI ID:7099496