Need temperature controlled DC motor speed

Discussion in 'The Projects Forum' started by Jack_K, Oct 1, 2011.

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  1. Jack_K

    Thread Starter Active Member

    May 13, 2009
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    I have a 12 VDC fan motor that draws over 40 amps. I need to control its speed from zero to full speed based on the resistance of a temperature sensor. Any ideas?

    Jack
     
  2. oldtech33709

    New Member

    Sep 24, 2011
    26
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    Do you have a data sheet or make/model number for the fan?
     
  3. Jack_K

    Thread Starter Active Member

    May 13, 2009
    115
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    It has DEPO 330-55001-000.
     
  4. Bernard

    AAC Fanatic!

    Aug 7, 2008
    4,176
    397
    A few thinking points:
    A Use neg. lead from power supply to motor as currens sense.
    B Use one or two Si diodes as temperature sensors.[ give reasonable linear output ].
    C Operational Amplifier to adjust offset, inversion & supply gain.
    D Use Sgt. Wookie's voltage controlled PWM ckt.
    E FET driver.
    F Several low RDS, high current FETs in parallel.
    G 40As of back EMF supression for motor.
     
  5. Jack_K

    Thread Starter Active Member

    May 13, 2009
    115
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    Thanks, but I can't find Sgt. Wookie's voltage controlled PWM ckt.

    Jack
     
  6. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Hello again Jack,
    You've been away for awhile. Nice to see that you're still alive 'n' kicking. :)

    Unfortunately for your topic, the Terms of Service has been amended during the time you have been away. If I may call your attention to the following paragraph:

    In light of (to you) the new policy on this type of topic, I'm afraid that this Forum will no longer support these discussions, so this thread cannot continue.

    There were a number of reasons for the new policy, but mostly it was due to the number of neophytes engaged in functions that really required automotive engineering expertise; the failure of their intended projects could have resulted in dire consequences. While I know that you don't exactly fall into that category, the rule is global for these Forums, and exceptions to the policy are not made.

    However, this topic: http://forum.allaboutcircuits.com/showthread.php?t=54400
    contains links to various other websites where such discussions might be entertained.
     
    Last edited: Oct 1, 2011
    Jack_K likes this.
  7. Wendy

    Moderator

    Mar 24, 2008
    20,766
    2,536
    Sorry guy, but Wookie speaks true. I hope you will not take it personal in any way.
     
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