| 摘要 |
An implantable blood pump actuator (1) uses an efficient direct drive voice coil linear motor (2) to power an hydraulic piston (7). The motor is immersed in oil (12) and has but one moving part, a magnet (3) which is attached to the piston. The piston is supported using a linear double acting hydrodynamic oil bearing (8) that eliminates all wear and will potentially give an infinitely long life. There are no flexing leads, or springs to break or parts to fatigue. A total artificial heart embodiment is very light, small, and as efficient as present prosthesis. The motor uses two commutated coils (13, 13a; 4, 5; 4a, 5a) for high efficiency and has inherently low side forces due to the use of coils on both the inside and outside diameters of the magnet. The motor is cooled by forced convection of oil from the piston motion and by direct immersion of the coils in the oil. This highly effective cooling results in a smaller, lighter weight motor. |
