Electric propulsion motor for marine vehicles
US5229677A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 18, 1991 |
| Grant date | Jul 20, 1993 |
| Priority date | — |
| Expiry date | Sep 18, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K2201/06
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An improved electric propulsion motor for marine vehicles. The motor has an axial gap design with a disk-shaped rotor and two disk-shaped stators. Within the large, open diameter of the motor a sound isolation coupling is disposed between two annular plates that connect the rotor to the propeller shaft. Circumferential thrust bearings counter and distribute electrical and mechanical forces in the motor to maintain the position of the rotor relative to the stators. A journal bearing supports the rotor. Noise reduction is greatly enhanced by the implementation of staggered stators, skewed stator slots, skewed field poles and a current control system that compensates for torque pertubations that are a repeatable function of shaft angle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.