F&P as a motor

Author	Message
MrBungle Newbie Joined: 07/10/2005 Location: Australia Posts: 34	Posted: 11:59am 20 Oct 2005         Chris said   <snip>...a external H bridge circuit powerful enough for the motor. The H-bridge circuit is controlled by the BLDC controller[/quote] Opps, sorry, missed the external part! [quote]<snip>...i can get around that too, just build a square wave generator. Wont be too hard.[/quote] Yep, too easy, the framerate is 50hz BTW. [quote]I bet the schulze controller rated at 5kw would die if you connected it up to the F&P...<snip>[/quote] I dunno, the photo I saw was of a very impressive bit of kit. There were many many decent sized fets on that large board! The tracks were beefed up with copper bars too. I wish I could find the magazine, but from memory there were no wires to the motor, it had four paralleled bannana style sockets per phase, leaving wire selection to the customer. The battery wires(which are always short due to inductive problems at the high switching rates) I think were paralleled and looked bigger than 14guage, probably commonly available 12 or 10 guage. Maybe the production version(I've not seen it) has been derated, which would be strange because they only decided to do it after customers asked for a many kW controller. 12guage wire will handle surprising currents in short lengths. A single 4" length will only drop 0.6v at that current but generate almost 7W of heat, not sure if thats enough to fuse or not. Simo