About the ac laminated solenoid(snubber choice)

Discussion in 'General Electronics Chat' started by Zara Engineer, Feb 9, 2015.

  1. Zara Engineer

    Thread Starter Member

    Feb 6, 2015
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    Hi

    I have bought an AC laminated solenoid of 7 kg for traction

    [​IMG]

    can anyone help to find like this solenoid of 20 kg or more ?

    thanx in advance
     
  2. Dodgydave

    Distinguished Member

    Jun 22, 2012
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    What voltage,and do you mean 20Kg pulling power?
     
  3. Zara Engineer

    Thread Starter Member

    Feb 6, 2015
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    yes exactly
     
  4. MaxHeadRoom

    Expert

    Jul 18, 2013
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    That is a very high power required, most certainly you would need a DC version.
    A small linear actuator may be more practical?
    Max.
     
    Last edited: Feb 9, 2015
  5. Zara Engineer

    Thread Starter Member

    Feb 6, 2015
    53
    0
    Hi

    It's good idea , but my problem with dc supply

    I found on alibaba.com a solenoid of 250 N and I wanna try it.

    thanx you very much
     
  6. MaxHeadRoom

    Expert

    Jul 18, 2013
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    A simple bridge rectifier is all you need for the DC variety.
    Max.
     
  7. Zara Engineer

    Thread Starter Member

    Feb 6, 2015
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    Hi Max ,
    I will see the difference between the 2 components and choose the best.

    thanx in advance
     
  8. MaxHeadRoom

    Expert

    Jul 18, 2013
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    The DC version is more efficient and less liable to over-current (burn out) in the case of a overload etc.
    Max.
     
  9. Zara Engineer

    Thread Starter Member

    Feb 6, 2015
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    0
    Hi everyone

    Sorry for my new question!

    there're an RC snubber network that should be connected to solenoid to protect switch or relay, that connects the solenoid to the electricity source ,from the effects of spark.

    The specialist or engineers gives 2 types of RC snubber connection

    1- the first in parallel to switch like this photo :
    [​IMG]

    2- the other is parallel to the load ( and optionaly parallel to the source )

    [​IMG]

    so what's the solution ??

    Please let me know !

    zara
     
  10. MikeML

    AAC Fanatic!

    Oct 2, 2009
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    Come on, Mr Engineer. Either will work. It is a simple series circuit: Line voltage, voltage across the inductive load, voltage across the open switch.

    The line voltage (or DC supply) is a very low impedance source, so it is what it is. As the switch breaks the circuit, the current keeps flowing in the inductor, causing a large instantaneous voltage across the inductance. The voltage across the open switch is equal but opposite in sign to the voltage across the inductance. Putting a snubber in either place will limit the magnitude of the other.

    150.gif
     
    Last edited: Feb 16, 2015
  11. Zara Engineer

    Thread Starter Member

    Feb 6, 2015
    53
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    Hi cool Mike
    thank you very much.

    Is this applicable for DC or AC source?

    And how to know the value in Kv of the voltage accros the switch?

    Please let me know!

    thanx in advance
    Zara
     
  12. MikeML

    AAC Fanatic!

    Oct 2, 2009
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    AC is a bit more complicated, because the switch can open at any point in the AC Sine wave.

    The maximum allowed voltage is determined by the switch. Design a snubber to limit the peak voltage across the switch...
     
  13. MaxHeadRoom

    Expert

    Jul 18, 2013
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    You show a symbol for a DC motor but it is a AC source?
    Here is something on snubbers.
    Max.
     
  14. Zara Engineer

    Thread Starter Member

    Feb 6, 2015
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    0
    Hi Mr MaxHead

    thank you very much for the pdf !

    you help me a lot in this thread .
     
  15. MaxHeadRoom

    Expert

    Jul 18, 2013
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    I forgot this one also.
    Max.
     
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