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[DPRG] Re: Motor Control and parts shopping

Subject: [DPRG] Re: Motor Control and parts shopping
From: Rud Merriam k5rud at arrl.net
Date: Fri Aug 28 14:12:14 CDT 2009

Sounds like it operates similar to a servo controller.
 
 - 73 - 
Rud Merriam K5RUD
ARES AEC Montgomery County, TX 
http://mysticlakesoftware.blogspot.com/ 

-----Original Message-----
From: Jose I Quinones [mailto:jiq at avayan.com] 
Sent: Friday, August 28, 2009 1:27 PM
To: dprglist at dprg.org
Subject: [DPRG] Re: Motor Control and parts shopping



Hi guys!

 

Allow me to recommend something totally different and to my understanding
considerably easier to use, better deal, and better performance. Maybe it is
"less fun" but I believe it can still be an enjoyable experience.

 

TI has a new device called the DRV8800PWP. It is a 2.8A H Bridge. The cool
thing about is that all you need to supply is ENABLE and PHASE. So you do
not have to worry about all the IN1/IN2 combinations, decay modes and stuff.
Just to add to the coolness, it is protected against output shorts, thermal
overrun and demonic possessions. This thing is practically immortal! The
only thing that it will not survive is voltage inversion or over voltage but
I have hardly heard of an H Bridge that contains those features. I believe
we are supposed to be minded enough to not let something as simple to
happen.

 

That being said, you can PWM either the ENABLE or the PHASE and you get
speed control on both situations. You may be saying "WHAT THE HECK??? PWM
THE PHASE?" If you have never heard of this, it allows you to control both
direction and speed with a single PWM timer. Per example, if PWM duty cycle
(DC%) is less than 50%, then the motor moves Counterclockwise (CCW). The
closer the DC% is to 0%, the faster the motor moves. But if DC% is above 50%
then the motor moves clockwise (CW). In this case, the closer the DC% is to
100%, the faster the motor moves. This is of course only possible when
ENABLE is asserted.

 

I have a design on my Open Source Design web page around this chip and am
working some new versions. Feel free to take a look and copy whatever you
want. It is as free as free gets. I also have some bare boards to sell in
case you want to build your own. They are sold at whatever cost me, so in
other words as cheap as I can afford.
http://www.avayanelectronics.com/Products/AE-DC1/ae-dc1.html

 

BTW if you need superbly high currents (which does not seem to be the case
for those considering to use a 600 mA device), then there is another larger
design here:
http://www.avayanelectronics.com/Products/MDL-7960/mdl-7960.html

 

Thanks and best regards,

 

JIQ

 

Feel free to visit some of my pages at:

http://www.avayan.com <http://www.avayan.com/> 

http://avayanings.blogspot.com <http://avayanings.blogspot.com/> 

http://www.comicups.com <http://www.comicups.com/> 

 

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