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motor driver circuit

 
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asunca



Joined: 09 Sep 2005
Posts: 36

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motor driver circuit
PostPosted: Fri Nov 18, 2005 8:22 am     Reply with quote
i got to drive a huge current consuming (25A) dc motor with pic. and i got a few IRF250s. how can the motor drive circuit can be constucted because i tried some methods with protective diodes but still it is dangerous for mosfets to be on. a fwe links maybe..
treitmey



Joined: 23 Jan 2004
Posts: 1094
Location: Appleton,WI USA

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PostPosted: Fri Nov 18, 2005 9:01 am     Reply with quote
Do you just need to turn it on and off?

Last edited by treitmey on Fri Nov 18, 2005 1:39 pm; edited 1 time in total
MikeValencia



Joined: 04 Aug 2004
Posts: 238
Location: Chicago

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PostPosted: Fri Nov 18, 2005 12:18 pm     Reply with quote
How much current does the motor really consume during "normal" operation? You can use:

IRAMX20UP60A
IRAMX16UP60A/B

(where the '20' and '16' means the current rating). These are pretty pricey 3-phase modules, so it is only economically sound if you use them in at least an H-bridge configuration (2 phases). Do you have to be able to turn in both directions? These have the IGBTs built-in; you just need to screw them into a heatsink, or even your chassis.
SherpaDoug



Joined: 07 Sep 2003
Posts: 1640
Location: Cape Cod Mass USA

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PostPosted: Fri Nov 18, 2005 2:10 pm     Reply with quote
I generally use the MAX627 family. Read the MAX627 data sheet for details.
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kender



Joined: 09 Aug 2004
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Location: Silicon Valley

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PostPosted: Sat Nov 19, 2005 3:24 pm     Reply with quote
Christian wrote:
I use the ST VNH2SP30-E, it has the mosfet drivers build in.

http://www.st.com/stonline/products/literature/ds/10832/vnh2.htm


I have come across this chip some time ago, and I was planning to use it, but the whole project got canceled. I wonder, can this chip run 30A continuously for hours (in an application such as windshield wiper motor)?
trento



Joined: 14 Oct 2005
Posts: 26

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PostPosted: Sun Nov 20, 2005 12:08 am     Reply with quote
I suggest you IRF150 or there is module of H-bridge can handel high power which is availble in IRF
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