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Just got everything I needed for my $50 robot build, except the servos..I have a bunch of PC case fans sitting around, any way I could swap these into the build without much fuss?
corrado33 <- Brushless control won't do with an H-bridge. If you reverse the power to the in-built controller you probably blow it.If you remove the controller, you have (at least) 3 coils in star or delta formation that needs their power 120° apart - i.e. a rotating field. Some have more coils.
[...]corrado33 <- Brushless control won't do with an H-bridge. If you reverse the power to the in-built controller you probably blow it.If you remove the controller, you have (at least) 3 coils in star or delta formation that needs their power 120° apart - i.e. a rotating field. Some have more coils.
Quote from: Soeren on August 05, 2011, 11:15:32 PM[...]corrado33 <- Brushless control won't do with an H-bridge. If you reverse the power to the in-built controller you probably blow it.If you remove the controller, you have (at least) 3 coils in star or delta formation that needs their power 120° apart - i.e. a rotating field. Some have more coils.You could get away with having n half bridges, where n is the number of coils - a number of commercial RC brushless controllers use a triple-half-H-bridge for controlling the motor.
You could get away with having n half bridges, where n is the number of coils - a number of commercial RC brushless controllers use a triple-half-H-bridge for controlling the motor.
Hi,Quote from: rbtying on August 07, 2011, 09:51:10 AMQuote from: Soeren on August 05, 2011, 11:15:32 PM[...]corrado33 <- Brushless control won't do with an H-bridge. If you reverse the power to the in-built controller you probably blow it.If you remove the controller, you have (at least) 3 coils in star or delta formation that needs their power 120° apart - i.e. a rotating field. Some have more coils.You could get away with having n half bridges, where n is the number of coils - a number of commercial RC brushless controllers use a triple-half-H-bridge for controlling the motor."Half an H-bridge" is correctly named "a half bridge", not "a half H-bridge". The name "H-bridge" is only used about an... H-bridge and it's due to the imaginary "H" the setup is usually drawn like of course.[...]
pc fan does have 3 wires like a servo