Posted by crystal garris on September 12, 2011 at 7:27pm
so the big boys use it. diydrones uses them . I am going to need one soon. and I've been thinking about how to build one on the cheap.a few thoughts1 cordless drill with an rpm meter (probably not very accurate but cheap)2 stepper motor (rpm accurate but motion not constant ie stepping)3 cnc type servo ( more expensive but might do the job)4 ask chris what he is using (unknown )anyone else have any thoughts ? I'm going to test drill and servo this week sometimeregards
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I have an idea. Get an old LP record turntable and replace the motor with a small 3 phase motor(low kv) with a controller that can be set to RPM mode. Turn table has rotational inertia due to its mass, their job is to run steady. You also have a big platter to attach test subject and equipment to, just keep it balanced. Control the PWM to the motor contoller using an Arduino controller and calibrate it. I wrote a motor controller for testing motor thrust and it works very well. I used a serial display from Sparkfun and a few switches for setting output. I can give you the code after I add the calibration setting you will probably want.
Now where to find a small 3 ph motor and RPM contoller with PWM inputs?????
Or were to get a good turn table cheap that you can hack.
Replies
Pat from Invensense was using a turntable and a USB slip ring.
I have an idea. Get an old LP record turntable and replace the motor with a small 3 phase motor(low kv) with a controller that can be set to RPM mode. Turn table has rotational inertia due to its mass, their job is to run steady. You also have a big platter to attach test subject and equipment to, just keep it balanced. Control the PWM to the motor contoller using an Arduino controller and calibrate it. I wrote a motor controller for testing motor thrust and it works very well. I used a serial display from Sparkfun and a few switches for setting output. I can give you the code after I add the calibration setting you will probably want.
Now where to find a small 3 ph motor and RPM contoller with PWM inputs?????
Or were to get a good turn table cheap that you can hack.