DC Motor Overload Protection

Discussion in 'The Projects Forum' started by panic_on, Feb 11, 2014.

  1. panic_on

    Thread Starter New Member

    Feb 10, 2014
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  2. R!f@@

    AAC Fanatic!

    Apr 2, 2009
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    U need to post your diagram.
     
  3. panic_on

    Thread Starter New Member

    Feb 10, 2014
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    Thats is the problem, I need help for this diagram.
    Any body now about this, please help
     
  4. R!f@@

    AAC Fanatic!

    Apr 2, 2009
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    That is the main problem. We cannot help you if you do not have anything.

    So you saw a youtube and you want to make it. Fine, but you have to ask the guy who posted the video. Not us.

    Cause we do not have diagrams laying around. We help not make.

    But I will tell u this.
    A motor overload protection can be made if we know the motor type ( it's data or specification )
    It's load. What is it driving etc.

    You don't just build and overload and expect it to work for ya.
    Overload protector are build for THAT motor.

    In addition the above does not make any sense to me. :confused:
     
  5. R!f@@

    AAC Fanatic!

    Apr 2, 2009
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    Do you have a motor to begin with?
    If so tell us.
     
    Last edited: Feb 11, 2014
  6. MaxHeadRoom

    Expert

    Jul 18, 2013
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    It is usually preferable and more practical to build in current limit rather than motor cut off.
    This is how it is done in electronically controlled motor drives.
    Max.
     
  7. THE_RB

    AAC Fanatic!

    Feb 11, 2008
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    A good option these days is to use a SMPS PSU. They are common and cheap, and have voltage regulation which is good for motor performance and safety. They also have current limiting, which is excellent for motor protection and limiting startup current etc.

    Just buying a modern SMPS PSU instead of a traditional transformer/bridge/cap PSU will solve most of your problems. It is also smaller, lighter and cheaper! :)
     
  8. inwo

    Well-Known Member

    Nov 7, 2013
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    It looks like it's just a relay across a series resistor that latches or unlatches.

    Not a standard circuit that someone will engineer for you.
    Something to experiment with if you understand the principle.
     
  9. panic_on

    Thread Starter New Member

    Feb 10, 2014
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    Thanks all for the reply,

    Thats the point, I must detect jammed dc motor,
    actualy in dc motor has already apply thermal protection.
    but I have circuit to control DC motor, this circuit must detect when rotate dc motor.

    For the limit switch is greath idea, but its not recomended for my design.

    regards
     
  10. R!f@@

    AAC Fanatic!

    Apr 2, 2009
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    Then we need to see the diagram to put the so called overload protector.

    If you do not tell us what we need to know, it's just useless to go on.

    You haven't told us any thing about the drive circuit and motor spec
     
  11. inwo

    Well-Known Member

    Nov 7, 2013
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    Give me the must hold and must trip current and I'll see if one of these would work.

    http://forum.allaboutcircuits.com/showthread.php?t=93967

    It's just a reed switch in series with the stop circuit latched relay.

    If you have access to ac side of circuit and current rises proportionately, one of these might work. (picture)


    Dc versions are not as available.
     
  12. inwo

    Well-Known Member

    Nov 7, 2013
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    Here is a way that might work.

    Select series load resistor R2 and CR1/R1 combination, so that CR1/R1 drops out with voltage drop under overload.
     
  13. panic_on

    Thread Starter New Member

    Feb 10, 2014
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    I have DC motor 12V, 10A.
    I need help build circuit for detection jammed motor to cut off the power.
    To all Senior, please help me.

    Regards
     
  14. inwo

    Well-Known Member

    Nov 7, 2013
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    What, no good?

    This it what was suggested by the video.

    If my simple examples won't work for you, someone on here can design a solid state circuit to your specs.

    Or are you looking for something to buy off the shelf?
     
  15. panic_on

    Thread Starter New Member

    Feb 10, 2014
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    Oke, I will try this circuit,
    I hope this work, many thanks all.
     
  16. panic_on

    Thread Starter New Member

    Feb 10, 2014
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    I am very confuse about this,
    I have motor power windows 12V 20Amp,
    and I have circuit to operate this motor with time delay relay 5s.
    If the motor has stall (full close window), I must cutt off the power.
    Because I use remote to operate Auto Up from auto lock door.
    My circuit has run as well, but if lock door operate many time in shot duration,
    the power has run to the motor for along time,
    Because motor has stall, my circuit has been hot.
    So I need build Overload Protection for safety my circuit,
    In my country hasn't shel circuit breaker.
    Any body now about this? please help me:confused::confused::confused:
     
  17. panic_on

    Thread Starter New Member

    Feb 10, 2014
    7
    0
    Dear all,

    Finaly its done, many thanks for support.
     
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