Magnetorheological Fluid Controlled Differential Planetary Transmission Mechanism And Design Studies

The magnetorheological fluid (MRF) controlled planetary gear transmission device the paper deals with is mainly used to transfer torque and regulate speed steplessly by changing the viscosity of the MRF. The device can achieve soft start, regulate speed and torque smartly and have a function of overload protection.According the character of the MRF transmission device and the planetary gear transmission device, an overall design of the magnetorheological fluid (MRF) controlled planetary gear transmission device is carried out. Based on the overall design and the experience of the predecessors, the design of the planetary gear transmission device and the initial design of the MRF transmission device is proposed.Theoretical models are built to explain the relationship between the main parameter of the device and the transmitting torque, which can analyze the performance of the device. The implementation of the model is based on finite element method, and the results include magnetic flux density produced by electric field and the shear stress of MRF which is caused by magnetic field to provide the transmitting torque. After obtaining one set of initial analytic results, an optimization which uses the subproblem approximation method is carried out to obtain an optimum design, one with high transmitting torque, low weight and small size. Based on the optimization of the MRF transmission device and the design of the planetary gear transmission device, a final design of the magnetorheological fluid (MRF) controlled planetary gear transmission device is proposed.Finally, the research of controlling method which can regulate speed steplessly of the magnetorheological fluid (MRF) controlled planetary gear transmission device is given.