Jeri shows the basic construction of solenoid actuators and demonstrates the relationship between strenght and hold power relative to current flow in the coil. This video was sponsored by www.intersil.co...
Thanks for taking the time to do this. People who follow your work know how busy you are and how many projects you are doing ---all at the same time. I am working on a crystalline semiconductor voltaic cell right now and your videos on making a transistor at home have really helped. Thanks.
You madam just got a new sub .. because you answered a bunch of fundamental questions ie strength , construction etc. Plus your voice and presentation is bar none! Compared to the other videos ive watched. Thank you so much
hahaha, me too! I watched one of her vids 2 years ago on how she got started in electronics. I recognized her voice. I am a little bit further in my own education on electronics now myself.
Great video! Thank you for making/posting it! I am working on a project that requires a custom solenoid and having a company make one for me is way too expensive, so my only option is to make one myself. Your videos are a great help. Thanks again!!!
I LOVE YOU JERI - please keep up the good work you are doing by demistifying electricity and its applications - quite opposite to my university professor of electrotechics whose only purpose was to beat us down so he and his 40 years old knowledge coudl appear bigger. LOVE YOU! :)
@Insignificantful With enough voltage to overcome the inductance of the coil, which would tend to prevent any change in the current through it, if you had a sensor to determine the armature position, you should be able use PWM to put it where you want. But it would be like regulating air to a pneumatic cylinder: it's going to want to slam to one end or the other and you would have to really keep close control to balance the forces of the spring pulling one way and the load the other.
@frac A magnet should work if the coil produced a field of opposite polarity. Of course it would have to be made of a material whose magnetic domains would not flip from the mechanical hammering that a solenoid would take. Magnets are used in some relays (like reed relays) to work with the coil. Magnets are sometimes used to hold relay armatures in whichever position the relay was last put in. Or to prevent contact bounce.
@jeriellsworth The Classic Eveready 9V batteries had the cat with the lightning bolt tail jumping through the number 9. They still have a smaller logo of the cat on the Everready 9V.
@dealio82 Yes, but the hard part is not the coil, but the iron magnetic path around it that focuses the flux to get maximum force on the armature, without which if would be much weaker. But why start from scratch when there are so many available as surplus? If you want one to play with, find a dead auto starter solenoid. Remove screws or grind/file off rivets to open and repair the wire break or whatever; the fault should be easy to see. AC solenoids can be had from scrapped clothes washers.
@droidclone When the magnetic path is through a closed iron circuit (as in this case), the flux is in a circular shape. Where is the start or end of a circle? There is none. So there is no pole per se. A pole is just a place where you can shove in something to sense/measure the flux, but if it is inside where you can't get at it, one place is just as "poley" as another. If you removed the armature, the poles would be where the metal ends and the hole in the coil starts. It's just a concept.
It puzzles me as to why that no person seems to mention this useful fact. See for yourself here, www.daycounter.com/Calculators/Magnets/Solenoid-Force-Calculator.phtml
If it is a single coil solenoid and no complications in the drive circuitry(fixed voltage), the dissipation will stay the same. The temperature rise will be about the same. There will be less heat transfer to the plunger so the coil is likely to reach its final temperature a little sooner. If the solenoid has a low resistance pull in winding which stays energized for too long, it will quickly go over temperature and be damaged. The lid latch solenoid(single coil) in my f&P washer is momentarily pulsed with a higher voltage from a capacitor to increase pull in force.
Thanks Xavier. I have an appliance which has a solenoid operated valve passing water. It is 12 volts. The valve is kept shut by the water pressure and is powered open. Which should not exceed 5 bar whilst open. It sometimes experiences water pressures around 9 bar for about 20 minutes at a time. I thought this might have a negative affect on the coils or windings. Thank you for your comments. Really appreciated.
Don't forget about driving the coil from a higher than rated voltage through a dropping resister to counteract the inductance's tendency to extend the pull-in time, that is to say, to make it quicker.
Oh wow, this reminds me of when I used to service the machines at Sol's Pinball Arcade, on Brighton Pier. The place was powered off of a 220v 3-phase board, with a real 'Soggy' (high resistance) Neutral One night when the illuminations and floodlights were turned on, the power rocketed up to 300V, there was smoke, bulbs popping, the place was in chaos! It sure got Sol annoyed
@CampKohler The insulation on the solenoid coils are particularly susceptible to electromagnetic pulses. The insulation melts and makes all the elcetrons go cuckoo-bananas.
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I have a q. At some point i had to take apart 4 big old style photocopiers. Obviously i managed to get a ton of "free" parts. Among them a lot of solenoid actuators for the trays rollers pins etc. I've always wondered why the tip of the armature in those types of solenoids are conic and not flat like in the ones in the video. Thanks in advance.
When alien tripods raise out of the ground and you find your car is no longer starting, replace the solenoid. I picked up that tidbit of advice from Tom Cruise when he wasn't busy crawling across the ceiling and shooting sparks out of his ears.
?Question: When a coil begins to freak (high frequency chatter) first could you elaborate why it begins to fail in this manner, second? Is there something that can be added to eliminate the freaking. I will eventually absorb all of your lectures, this means the world to me. Your method teaching is superb, exactly what I need. It must be that those of us that circumvented the education system
@jacgoudsmit In North America, it's from Eveready "Nine Lives" batteries. There was a cat jumping through a nine on the case. Betterijen is way cooler than battery. I think I might start using that in English.
I’m building a possum trap. Cage type. As a kid I made traps where a possums weight on a ramp tripped a guillotine type trap door that shut behind animal. Now I want a electric trip where I still use a ramp which taps a micro switch that sparks the coil/solenoid pulls the pin that drops the door. But how do I stop power after trap has tripped? Power would have to be switched off to avoid burning out coil.
Jeri ! where are the other parts of the series "solenoid basics" ??? do they still exist ? I hope you talked in them about the voltages that they can receive,what would happen if you apply lower or higher voltages to the valves..how can you adjust the voltage to a certain valve..and so on..that is very nice of you if you can talk about this issue" sol. valves and voltage"
When you tried to see how much the solenoid could lift I thought about car door locks. I've seen kits that you can buy to retrofit older cars for keyless entry and wondered - what if it won't unlock the door?
2:25 OK, late to the game here but... a comment related to coil resistance: heat. Depending on the application and the environment, this might be a problem. If the coil gets to hot, it is my limited understanding that it will negatively affect the magnetic field strength. Of course, if hot enough, it could also damage the coils' insulation as well. It would be interesting to here if you've experienced any heating problems yet and how you've tried to address them. Anyway, great video.
I'm fairly new to electronics, I've made a solenoid with a straw and a lot of wire, and it is still weak. Say you run the coil one way up the length of the straw, when doing a second layer, would it work better to run it the opposite direction, would the opposite spinning magnetic fields complement eachother better, if I could use an analogy, it would be like gears, where two gears spin the opposite direction. Of course then I suppose you'd have to do every other wire opposite if it works...?
I want to make A mini jackhammer out of a push pull solenoid. I don't know how to make it work like a jackhammer?? like 'Push and pull' is one cycle like a jackhammer. I have been trying to find out how for like 4 days now. is there a little pcb board that can do this or control it?
Wow. I always thought solenoids had a magnet in the middle. I thought you could choose to move them in or out based on the direction of the current flow. I guess that'd be a voice coil...
@jeriellsworth It would be one heck of a coincidence if they were the witte-kats jacgoudsmit mentions. They were probabably the black cats of the Eveready trademark (USPTO registration no. 3384908), which was first used in commerce in 1959.
i was looking to make solenoid engine so i ad a electric bell which was not in use so i took the solenoid off. then i passed current (12 v ) but it wont attract anything..(not even small screws-the one in toys). it was coiled on plastic so i passed the iron in the middle gap so it now attracts screws but to make an engine it had to attract the iron but it isn't.. pls help
Hello, please what is the amount of Maximum Voltage my 3.5kg Air Core Electromagnet can bear. The Core of the Solenoid is 120mm in height and 13inches in Diameter. It core is 47mm wide and 130mm long. I used 0.31mm thick enameled copper wire to make it and after winding it reads 1.4KOhms Please may I know the maximum Voltage to apply to it in other not to get it burnt? How do I calculate that?
I'm trying to figure out what solenoid ratings mean. If a solenoid says "20N" I am guessing that means it can exert that amount of force. But does it mean 20N will be exerted in the final millimeter before stop? This is kind of annoying because there are many more applications for something that can exert 20N over 10mm rather than 20N over 1mm.
I built one of those floating ball machines using a coil and IR led/phototransistor. I tried short, fat coils and long skinny coils (using the same magnet wire length) and the short fat coils worked much better. This seemed wrong since the long skinny one has more turns. Any idea why? I was using carriage bolts for a core.
@jimbobg65 Every turn costs money; every turn of SC wire costs big money. So they want to limit turns. To increase strength then, increase current, but if you go too high, the SC disappears, so that is self-limiting. So how many volts do you put across a 0-ohm coil to get X amps of current? Something to think about. For a non-SC coil, you need enough DC resistance to limit current to keep temp below damage point, but still have enough flow to get the max field strength (trade off).
@illustriouschin Sorry, but no sale on that explanation. The cars always start up after the aliens leave, so nothing was really damaged. Cuckoo-bananas, however, is a perfectly acceptible explanation.
Yay fun video! wondering can you operate one solenoid at different amounts of current in one circuit? I'm guessing this would be done by some parrell circuit of some sort, or a diff. load voltage?
So the music blows out your eardrums, then the volume is so low you can't hear what she is saying (through the left headset speaker only) that is until the ball bearings drop as that sound is loud and through the right (through the right headset speaker only).
