Integral Electric Motor/Waterjets for High-Speed Amphibians
Abstract
The result of this Phase I effort is the preliminary design of a waterjet propulsor with its electric drive motor integrated into pump hub. The system shows good motor performance -- high efficiency and more than adequate cooling capability; and good waterjet performance -- high propulsive efficiency, high pump efficiency good cavitation performance, and good nozzle and inlet performance. By using NKF Engineering's pump impeller design concepts in concert with Unique Mobility's high efficiency/high power density electric motor technology, all system requirements were able to met. Gear boxes were to be eliminated in favor of direct-drive motors. The nature of the Unique motor design is such that the rotor could be configured as a large hollow ring, permitting the placement of the impeller internal to the shell of the motor rotor. Final configuration development resulted in a package with the following characteristics: Two stage waterjet; total length of not greater than 57 inches; total diameter not greater than 16 inches; total dry weight of 479 pounds; system voltage of 360 volts; the electrical efficiency of 95 %. A phase II program would focus upon the detailed design and development of full scale prototype test hardware. Particular emphasis would be placed upon measurement of thermal losses and verification of our motor cooling model.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 06, 1991
- Accession Number
- ADA238613
Entities
People
- Joseph M. Olbermann
- William M. Anderson