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    Sinusoidal Friction Drive

    yeah I considered 2186s, expensive but I like that I could lower my gate resistor (15ohms now) and speed up switching. My FETS run cool though so Im not too concerned.
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    Sinusoidal Friction Drive

    Neptronix, The mount is temporary, Im going to build an aluminum case soon. The whole thing is narrow enough to fit in the triangle of my fat tube MTB ie I can just use flat, unformed aluminum side plates. Lebowski, I'd need to add some components but would your code work on my dsPIC33?
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    Sinusoidal Friction Drive

    It’s about time I started a build log for a project that I’ve been working on for a while. I’ve read a number of the threads on this forum; it’s an amazing resource, thanks to everyone for sharing their knowledge. This is a sinusoidal ESC driving an RC friction drive. The friction drive part...
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    Doing the Math

    KF, Thanks for the Shane Colton link, that's some really relevant stuff. I was a bit disappointed when I saw the table on pg 45 which compares Kt for the 3 motors. It shows the axial coming in a distant 3rd, but I punched the tabulated numbers into the equation and got a much more impressive...
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    Doing the Math

    Thanks for the explanation KF, I like the gearing analogy. I'm still confused though. I've been approaching the problem from a Lorentz equation point of view ie for a given amperage the torque achievable by a motor at low rpms is proportional to the length of wire and the density of the flux...
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    Doing the Math

    Hey KF, I was wondering about your choice of bar magnets. It seems like there would be a lot of flux leakage from magnet to magnet near the ID where the magnets are almost touching. Nearer the OD you have large gaps between the magnets - torque and efficiency will be negatively impacted. I know...
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    Doing the Math

    KF, you asked: 1.Axial DD motor, built on a customized hub. I’ve built an experimental version of the hub. It comprises of two 1/3 length hubs which are separated on the axle so as to expose the center section of the axle (total of 4 bearings) . A stator could be attached to this...
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    Doing the Math

    Rhitee, I'm fairly sure that the geometry will work. If you start with a ring of wedge magnets: ...and then push them out along radial lines that bisect each magnet, you end up with rectangular gaps: In the gaps you could place horizontally magnetized block magnets. Im glad you questioned my...
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    Doing the Math

    Hey KF, Greetings from across the lake. I’ve read most of this discussion - good work so far. Ive been working on a similar motor (axial flux DD). From all of my calculations, Femm analyses and spreadsheets I’ve concluded that its feasible....just, but weight is a major...
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    Motor Noise

    Olaf, something like this - right? but configured as an outrunner (coils and magnets reversed).
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    Motor Noise

    Thanks AJ. I watched your vid, cool bike-those belt drives certainly run quiet. Im still in the design stage. Once I have a plan Ill post some drawings.
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    Motor Noise

    Hi Excellent forum. Ive followed many of the discussions and Ive learnt a lot. Im getting ready to build a friction drive system for my road bike. Initial specs: Low end torque for hill assist Light and as quiet as possible. I live at the top of a 400ft hill and commute to an office which is at...
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