Project Title:

Three-Phase Invertor for Ultra-High-Speed Motor Drive

09.05-3800
Three-Phase Invertor for Ultra-High-Speed Motor
	Drive
Creare Incorporated
PO Box 71
Etna Road
Hanover, NH 03755
Javier A. Valenzuela  (603-643-3800)
GSFC -- NAS5-30272

Abstract:

	 A novel, rotating-field invertor for converting dc power to high frequency, three-phase
alternating current was investigated in this project. In addition to the commercial
applications listed below, this invertor is ideally suited for driving the ultra-high-speed,
miniature turbocompressors presently under development for use in cryocoolers needed
for space-borne sensors.
	Scoping analyses and proof-of-concept experiments performed during Phase I demonstrated
the feasibility and potential of this invertor concept. A breadboard invertor was
built and tested over a frequency range from 1 to 16 kHz. Throughout the entire frequency
range the three-phase output was close to sinusoidal. The low harmonic content of
the ac output will result in significantly higher motor efficiencies when compared
to efficiencies obtained using existing rectangular wave invertors. Preliminary design
of the invertor indicates that invertor efficiencies of 90 percent or higher can
be achieved.

Potential Commercial Application:

Potential Commercial Application: Variable-frequency motor drive systems conserve
energy in applications such as process control, pumping, high speed grinding spindles,
and high performance machine tool drives.