Comments on: Speedy2 R/C speed controller

By: jonored

jonored — Thu, 28 Dec 2006 23:21:15 +0000

You can certainly just reverse the current to reverse the direction of turn; most motors are absolutely fine with it. They do generally have a preferred direction, and won’t run quite as powerfully backwards, but that’s not a big deal.

The trick is, that means that rather than connecting and disconnecting one end of the motor from power with the other connected to ground, now you need to be able to connect and disconnect both ends of the motor to both power and ground. It takes four times as many switching devices to do it. So the cost isn’t in getting the motor to be happy with running backwards, it’s the actual effort required to change the direction of the current through it. This design is of the simpler, unidirectional variety.

By: srilyk

srilyk — Thu, 28 Dec 2006 20:56:50 +0000

Shouldn’t it be possible to just… reverse the current to reverse the speed? I don’t claim to know everything, pretty new at this, but I would think that it should – all the electric motors I’ve used if you just reverse the current the motor spins the other direction. Or is that not a healthy practice for your motor?

By: RusH

RusH — Thu, 28 Dec 2006 02:28:01 +0000

i looked at the diagram and Yes, forward only

By: mrdelayer

mrdelayer — Wed, 27 Dec 2006 18:39:04 +0000

San Antonio, of all places? :O I live there. Needless to say it’s not the hottest of vacation spots. What brings you down here?

By: mahder pwned inc.

mahder pwned inc. — Wed, 27 Dec 2006 15:30:11 +0000

damn, those looked really cool, i wish i was nifty with a screwdriver so i could make one.

By: Michael Vroegop

Michael Vroegop — Wed, 27 Dec 2006 08:40:11 +0000

neat... is it forward-only?

I'd assume so if it references operating in an R/C plane..

Still quite useful to me.

By: Binome

Binome — Wed, 27 Dec 2006 08:10:35 +0000

nice. gotta remember it for robotics season