| 摘要 |
PROBLEM TO BE SOLVED: To provide a braking system, facilitating control for prosthetic knee joint. SOLUTION: This invention relates to a variable-torque magnetorheologically actuated prosthetic knee 210 which utilizes a plurality of interspersed and alternating rotors 220 and stators 230 to shear magnetorheological fluid in gaps formed therebetween. Advantageously, by operating in the "shear mode", there is substantially no or negligible fluid pressure buildup or change. Moreover, the multiple MR fluid gaps or flux interfaces desirably allow for the production of a large torque at low speed without the use of a transmission and also for a wide dynamic torque range to be achieved. One embodiment of the invention allows the rotors 220 and/or stators 230 to close the gaps therebetween to create a frictional torque component, thereby forming a "hybrid" braking system which provides a total torque or damping which is a combination of viscous torque and frictional torque. COPYRIGHT: (C)2010,JPO&INPIT
|
