« | 23 grams of thrust, baby! »

haven’t written in a while

because we’ve been busy winding brushless motors and designing motor controllers. 

We have tried about 30 different motor / prop configurations and we still haven’t gotten better than about 15 grams of thrust.   Ever hear that expression, “you just can’t buy that”?  Well when it comes to GPS guided, autonomous, solar powered boats, you just can’t buy that.  You also can’t buy the parts that go in them.  Try it.  Go down to a hobby place, or Ebay or whatever and try to purchase a motor that will push a prop under water at over 15 grams of thrust with 200 mA.  You won’t find it.

 We figure our best option is to wind our own brushless motors with a very low KV value (thin wire, lots of turns).  We thought we could use off-the-shelf brushless motor controllers, but no, they are built to control RC airplanes, not low current water props.  So, we need to design our own brushless motor controllers to drive these low current brushless motors efficiently.

I never thought we’d get this deep.  Also, I burned my thumb today really badly on a mosfet that got super hot trying one of the configurations.  Try winding a 500 turn brushless motor with a blister on your thumb.

This entry was posted on 3. September 2009 at 21:00 and is filed under Electronics. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response or trackback from your own site.

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