Accession Number:

ADA238613

Title:

Integral Electric Motor/Waterjets for High-Speed Amphibians

Descriptive Note:

Final rept. Sep 90-May 91,

Corporate Author:

UNIQUE MOBILITY INC ENGLEWOOD CO

Report Date:

1991-05-06

Pagination or Media Count:

32.0

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 Engineerings pump impeller design concepts in concert with Unique Mobilitys high efficiencyhigh 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.

Subject Categories:

  • Electrical and Electronic Equipment
  • Marine Engineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE