| 摘要 |
A marine propulsor for submersible vessels or surface vessels powered by underwater propulsion units. A shaftless motor with disk-shaped rotor and stator(s) is mounted in the vessel structure with a blade hub mounted on the rotor, the hub including propeller blades extending beyond the circumference of the vessel housing. The motor is substantially iron-free with much of the rotor/stator volume being occupied by windings, thus providing sufficient power without taking up substantial space or adding burdensome weight. The rotor is journal mounted in the vessel and circumferential thrust bearing assemblies are provided around the rotor/blade hub assembly. A water cooling/lubricating system is provided for the bearings and rotor/stator(s). Power is supplied individually to two stators mounted on either side of the rotor to control electromagnetic forces on the rotor to offset thrust forces and to reduce the magnitude of propulsor induced structural vibration. Rotor excitation current may be inductively supplied, or permanent magnets or low reluctance magnetic material may be mounted in the rotor. Sound insulation is interposed between stators and the vessel structure to dampen ac noise/vibrations. In a dual counter-rotating propulsor embodiment, a thrust transference member is interposed between propulsor assemblies.
|
