Inspecting magnetic force necessary to activate a reed switch
Inspecting magnetic force necessary to activate a reed switch
(OP)
hi,
I am working on a project where i have to activate a 6AT reed switch from a distance of about 10 mm or a little more, I am going to use 10 mm X13 mm X 140 mm magnet will it have enough force to activate this switch I need to know before I try to get this large magnet volume because it will cost me as it is in customized shape and have relatively high volum as you can see from the size?
I am working on a project where i have to activate a 6AT reed switch from a distance of about 10 mm or a little more, I am going to use 10 mm X13 mm X 140 mm magnet will it have enough force to activate this switch I need to know before I try to get this large magnet volume because it will cost me as it is in customized shape and have relatively high volum as you can see from the size?





RE: Inspecting magnetic force necessary to activate a reed switch
RE: Inspecting magnetic force necessary to activate a reed switch
RE: Inspecting magnetic force necessary to activate a reed switch
Modeling is important.
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RE: Inspecting magnetic force necessary to activate a reed switch
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RE: Inspecting magnetic force necessary to activate a reed switch
RE: Inspecting magnetic force necessary to activate a reed switch
RE: Inspecting magnetic force necessary to activate a reed switch
I would ask the manufacturer, since they already know all these details.
RE: Inspecting magnetic force necessary to activate a reed switch
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RE: Inspecting magnetic force necessary to activate a reed switch
In order to activate the reed switch, one will have to know how much flux density is needed from the magnet. there is no simple relationship betrween AT (amp turn) and flux density (Guass). a rule-of-thumb may be used: 1 Gs per 1AT will activate teh switch when both magnet poles are near the two ends of the switch. so about 12 Gs is needed to activate a 12 AT reed switch. i feel, if the magnet is AlNiCo5 with the given size (magnetized along the length), at a distance of 13mm, you should have plenty of margin to make the switch close. if it is a RE magnet, you will get much more than enough field.
curious why you use 140 mm that long magnet? is your reed swtith super long?
RE: Inspecting magnetic force necessary to activate a reed switch
IRstuff, thank you very much & I would like to tell you information that I am sure of which is the pick of my reed switch it is this model
http://www.digikey.com/product-detail/en/MITI-3V1%... and i need to activate two ate the same time with a 130 mm separation space between each other this is why i need the magnet that long, I am afraid I am restricted in the mechanical feature of the magnet because it is going to slide into 12*12 mm plastic trunk,
everyone, I think I have made a huge step through solving the issue permanently- if you agree with me-, i have redesigned my application so that the space between the switch and the magnet is only few millimeters of plastic trunk material,l will use two plastic trunks, inside the first is the Reed switch and inside the other is the sliding magnet and the two is stuck to each other back how does this sound everyone? I believe this would allow me to use even N35 magnet to activate the switch with this kind of magnet size do you think this will work?
RE: Inspecting magnetic force necessary to activate a reed switch
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RE: Inspecting magnetic force necessary to activate a reed switch
RE: Inspecting magnetic force necessary to activate a reed switch
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RE: Inspecting magnetic force necessary to activate a reed switch
RE: Inspecting magnetic force necessary to activate a reed switch
RE: Inspecting magnetic force necessary to activate a reed switch
RE: Inspecting magnetic force necessary to activate a reed switch
I also don't know about manufacturing feasibility--3mm is pretty thin, and sintered magnets are pretty brittle.
If space isn't an issue than go with the ferrite over the neo.
I would go ahead and just buy the parts and test them.
RE: Inspecting magnetic force necessary to activate a reed switch
it seems that going for 3-4 mm is unpractical because of weakness I am forced to go for the y-30 i found because i received a .38 USD price for this size without any holes or tooling , and this is certainly a good price for me, it goes up to 0.8 USD with express which is also an acceptable cost and i will stick to 10 mm thickness i will only have to stick a longer iron thin plate with a hole to do the hang the lift thread in this is the only solution i may stick it with double face in addition to the magnetic force, i hope this would prevent it from going right or left , what do you think ? if that wont work i would use a thin plate with three leads one vertical and two horizontal to be bent around magnetic but not from reed switch side but the other side so the magnet will still face reed switches do you think this will work because 9-14 USD is a very huge cost for my aim , if that works the only problem would be if that magnet vendor is nothing but a scam !