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chunkulator
Joined: 27 Jul 2016
Posts: 219
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Can anyone suggest a flat, high power motor with high kV?
I've been making OK progress with this design based on Nick's roller suggestion. However, I'm having trouble fitting in the weapon drive motor without making the robot very tall or unusually shaped. Ideally the robot would be no taller than about 90mm so that a pair of 4" Colsons stick out the bottom and the top (so it can drive upside-down). Assuming I want about 5mm of metal over the drive mechanism the motor including shaft plus any sprockets/pulleys/gears it can be no longer than 80mm. I've been struggling to fit my existing weapon drive motor (see previous post) in vertically.
I might be able to find a way, but the alternatives I can think of are:
1) Make it taller and use, say, 5" Colsons. There will be a lot of empty space inside.
2) Make it funny shaped so it's taller at one end to make room for the drive mechanism.
3) Use bevel gears so I can mount the motor horizontally. How to fit the bevel gearing in is non-trivial.
4) Drive the ring on the upper or lower edge, rather than the inside edge. This exposes the drive wheel too much I think.
5) Use a different motor in a flatter can.
I've been looking for powerful weapon drive motors in a nice flat can and have found various helicopter motors, Neu 20xx motors and other such things, but all have kV way too low. In order to run the 280mm ID ring at around 5000 RPM with a 50-75mm drive wheel (bigger than that is hard to fit) on about 6S I want kV at least 800. Otherwise I'll need to gear the motor up before the drive wheel, which sounds inefficient and complicated. I'm not sure I'm at the stage in my robot-building career where I want to go rewinding motors to custom kV (although I suppose I'd need relatively few turns), which brings me to my question:
Can anybody recommend a powerful brushless motor (say >2000W) in a flat form factor (say < 70mm including shaft but having enough shaft to attach a drive sprocket) with kV > 800 RPM/V?
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Tue Jan 17, 2017 8:48 pm |
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