| With the prosperity of EV industry, some key technologies, including clutch, need to be developed desperately. So this thesis tries to design and analyse the clutchs used in a direct-drive in-wheel Transverse Flux Permanent Magnet (TFPM) motor developed by our research group.First, this thesis reviewed the history of in-wheel EV and its representative products or prototypes. The current technologies of clutchs used in in-wheel motors had also been reviewed. On the basis above, the thesis analysed the importance of in-wheel motor clutch, and pointed out some specific problems after introduced clutch. To solve the problems, this thesis proposed some feasible clutch topologies, built virtual prototypes on SolidWorks platform, and compaired the topologies above.Secondly, the design concepts of the actuator used in in-wheel motor clutch had been introduced. A bi-stable permanent magnet actuator with in-series magnetic circuit had been proposed based on these concepts. Magnetic circuit model and finite element model had been built and simulated in order to find out the appropriate parameters. And a prototype was made to verify the design. Meanwhile, a movement-direction-changing component was designed to change the horizontal movement into vertical.Thirdly, magnet flux tube method was used to build a 3D magnetic circuit analysis model of a novel type of TFPM in-wheel motor proposed by our research group. The model was compared with 3D FEA in calculating core flux using multiple sets of parameters, and a prototype was tested for validation. All the results show that the models are reliable.Finally, a simulation model of TFPM in-wheel motor direct-drive system was built on Simulink. The model of friction clutch was also built and applied in the system. The relations between motor intial speed, given force of the clutch and the clutch action time were found by plentiful simulations on Simulink. At the end, an experiment platform was built to verify the relations above. |
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