Author Topic: DIY DC motor Controller  (Read 5109 times)

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Offline owkTopic starter

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DIY DC motor Controller
« on: May 25, 2011, 01:51:45 PM »
I was wondering if anyone has eagle cad schematics for a  DIY dc motor controler for high voltage high amp motors? I found a link http://reprap.org/wiki/DC_Motor_Driver_1_1 showing a simple dc motor controller , can this be modified for the heavier loads?
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Offline owkTopic starter

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Re: DIY DC motor Controller
« Reply #1 on: May 25, 2011, 01:53:42 PM »
I should have mentioned that i would like to provide a pwm signal to the motor controller from a RC rx, so how can this be done , or do you know of anything out there that can handle this?
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Offline Razor Concepts

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Re: DIY DC motor Controller
« Reply #2 on: May 25, 2011, 01:59:36 PM »
Could you specify voltage and amps?
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Offline owkTopic starter

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Re: DIY DC motor Controller
« Reply #3 on: May 26, 2011, 08:31:01 AM »
12v and lets say something around 40A
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Offline rbtying

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Re: DIY DC motor Controller
« Reply #4 on: May 26, 2011, 09:25:12 AM »
Use an RC ESC - they're best suited to what you're trying to do, I would think.  That kind of current isn't something you want to mess around on.

If you really want to DIY it, you'll need power MOSFETs in a full H-bridge configuration, instead of the dedicated ICs on the schematic you posted.  They can only handle .75A, after all.
« Last Edit: May 26, 2011, 09:26:34 AM by rbtying »
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Offline owkTopic starter

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Re: DIY DC motor Controller
« Reply #5 on: May 26, 2011, 09:29:59 AM »
I need to get bidirectional control is there a way to mod an ESC so that i can get that control?
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Offline garrettg84

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Re: DIY DC motor Controller
« Reply #6 on: May 26, 2011, 10:00:18 AM »
Quote from: owk on May 26, 2011, 09:29:59 AM
I need to get bidirectional control is there a way to mod an ESC so that i can get that control?

Most RC ESCs today are actually for brushless motors (essentially they are AC motors...). A straight DC motor controller could be made out of the RC ESC if you could hack the firmware and it would definitely have the capability of running bidirectional. They typically power brushless motors with 3 leads and the ESCs contain 3 half h-bridges. So you would actually have a spare half-h per ESC you modded. Most of the hobbyking ESCs also have AVR controllers on them, so if you are familiar with Atmel ICs then this should be simple.


There are a few pages I'd found in the past about hacking some of the hobbyking brand ESCs and turning them into DC controllers.
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Offline owkTopic starter

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Re: DIY DC motor Controller
« Reply #7 on: May 26, 2011, 10:43:15 AM »
i would really appreciate if you have nay links to open source code of a hacked esc , im still a beginner at all of this, much appreciated
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Offline garrettg84

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Re: DIY DC motor Controller
« Reply #8 on: May 26, 2011, 11:13:20 AM »
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Offline cyberfish

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Re: DIY DC motor Controller
« Reply #9 on: May 27, 2011, 09:30:13 PM »
At 40A, IGBTs may be more efficient than MOSFETs.
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