Hello! The comment about "specifically the US" is about single phase power... Some countries (like Germany) have three phase power and don't require a start winding. We have both 120 and 240 volts in every house in the US. In fact the motor in this video is 240 volts. So what is single phase? I explain that in this video. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-2XYdTogWcIA.html
Just saw this, and subbed. My father is a retired R&D electrical engineer, all self taught. Yes he's that old, which makes me kind of old too now lols. You have a great way of explaining things, and excellent knowledge and presentation. I love the included bloopers (shows you are human too ROFL), and I hope to see more great and cool content!
@thx1138 ib3 but to answer your original question, 3 phase power is inherently "rotating - the AC in the legs is 120 degrees off. But when you have single phase power - whether it 120 volts or 480, there is no rotation, single phase power just goes up and down, up and down. And lets say you take two of the three legs of a 380Y220 volt, 50 hertz supply in Germany, it is still only back-and forth without rotation. So there is an additional, partial winding, slightly out of phase with the main winding which provides the initial "kick" to get it turning. Sometimes this winding is helped with a capacitor (capacitor start) or not using a capacitor at all (split phase). But... three phase is inherently rotating and a LOT simpler, regardless of voltage or frequency.
Being a 71yo woman, I confess that I have always been interested in tools and how things work. I lost 2 washing machines and one dryer because that little thingy broke. If I had known about that, and had some sandpaper, I could have probably fixed them. Now I know what to listen for, and can't be fooled by repairmen saying I need a new whatever. Thank you for the info.
I can't believe that you kind folks have been so kind to me with 96 likes because I like tools and actually learned the repairmans "dirty little secret"!!! JFYI, I have been hearing that strange noise coming from my washer so I called a repair man and diagnosed the problem to him. He showed up yesterday with the part, put it in, and whatdoyaknow, no more noise, and a compliment from him, and a back sided remark about me knowing what the problem was!!! He said he hoped I would keep that knowledge to myself and not tell anyone how to diagnose their own problems as thats how he makes his money! I said I would not make that promise.
You are awesome! Keep working on stuff. I’m 13 and am getting into tools. Anybody can start working on electronics and building things no matter their age!
@First Last No we do care. She had something to say and many of us found it intersting enough to give a thumbs up. Her being an elderly woman helps her story
_If I had known about that, and had some sandpaper, I could have probably fixed them._ There's a million simple little things that can break in any complicated machine. The trick is figuring out *_which_* simple little thing. It helps to have an honest mechanic, too.
You probably could use brass cleaner or rust eater (phosphoric acid) to clean the contacts so the minimum possible metal from the contact is lost or other than that maybe some metal polish like brasso or preferably autosol.
@@thetessellater9163 I’d imagine I am a prime candidate as I’ve been paying for RU-vid for years now. The second they said I’d not have to watch ads and suddenly videos had 3-8 ads in them it seemed and still seems like a good purchase every month.
Fun Anecdote about this, because I do this too: during a class in college, my instructor asked us how many GPS/GNSS satellites it takes to get a position. Anyone that had an answer said 3, and were baffled to find they were wrong. Lucky for me, I had watched a video explaining how GPS/GNSS works just a few months before. I was able to explain how 4 were required to compensate for time deviation, because the satellites are travelling fast enough that there is a significant error in the equations if time deviation is not accounted for. "Gobsmacked" is exactly the word to describe the class, and the teacher was quite impressed. So preload on! It's actually saving me in my college studies.
I'm a "Show Me" guy, not a "Instructions guy", and you did an Excellent job of showing me how this motor switch works. The Video was clear and detailed. Thanks for a Great Video that went into detail. Super Job. Thanks again. Keep up the good work.
@onelove I Love RU-vid, Mr/Mrs Google and Wikipedia, I've never asked them a Question that they couldn't Answer or show me how something works. With all the problems we have in our World, these technological Giants are our Savior.
Thanks for being human. Most RU-vidrs would edit out the part about forgetting to shut off the power. It's nice to know we're watching someone just like ourselves.
Personally like the fact that he didnt delete the mistakes. This is important to trouble shooting to allow the trainees / followers what not to do along side with what to do. He also is informative and precise. Subbed and Appreciated.
As a technician that's worked on cars, appliances, computers, and printers, mistakes eventually happen to all techs, so I agree. It's valuable for a beginner to see it so they won't lose confidence if/when it happens. Just learn from it.
@Chi Sam For you to feel the need to criticize something so trivial and irrelevant, is a clear reflection of your lack of character. Your life must be very sad for you to even feel the need to post such a comment let alone actually post it. Good job at embarrassing yourself you sad individual.
@Chi Sam Aw, come on, man. I too appreciate showing the mistakes, as it is one way to help a novice not make them. So I like his comment. I am an exellent speller but I don't care if a nice compliment has spelling errors. For me, a kind heart and compliment will always override (oh, is that one word or two?) poor spelling and grammar. Also, Chi Sam, he does NOT need to make the last piece a complete sentence. Everyone will not only understand it (maybe not you), but it carries a certain conversational punch, just like the best of the best writers practice.
Touche! I can't believe I wrote "I am an exellent speller..." - can't stop laughing at the irony of that faux pas. You caught a good one. (I did say I appreciate showing the mistakes, didn't I? So I'm leaving it in.) Thanks for the heads-up.
It's also used as a clutch in chainsaws. When the engine rotates fast enough, the centrifugal force presses the weights against the inside of the chain drive drum and turns the attached sprocket which drives the chain.
I taught physics and math for 12 years. You're far better at explaining things than I am, and I think I'm pretty decent at it. I greatly enjoyed this, Jeremy! So did my brother, a union electrician.
The centrifugal switch is derived from the original centrifugal governor used to regulate windmills in the 1600s. James Watt applied it as the steam governor for engines in 1788. So it actually is near 400 years old! I only know because I think they are super-cool too! Your videos are always nice to watch!👍🏼
You know Watt did not totally invent the steam engine, I think he bought the original design, and then reversed the process from evaporation/vacuum to a power stroke. With that done it was used to run a more precise boring machine to make much better pistons and cylinders, to improve the steam engine, and on and on.
The switch resembles a centrifugal governor, also known as a Watt or fly-ball governor on a reciprocating steam engine. They pre-date the electrical era and are most likely the predecessor. Thanks for the video, I like your style, easy to follow along.
This was my thought too, but I'm not sure if it's the case. There are a lot of centrifugal switches out there from this electrical switch, to the fly-ball governor, to the centrifugal clutch used on a lot of small internal combustion engines.
Mechanical engineers gave us the world we have today. Sad thing is that you're under 40, chances are you have absolutely no idea how the machines you use every single day operate. Fixing your own stuff is almost a lost art.
@@roberthill5549 people are always amazed when I fix something on my own, or fix something like a dishwasher for them. It's a lost art for a couple of reasons; one, the throw-away culture, two, the increase in use of cheap plastic parts, and third, the advent of computer-centered controls, things that you can't figure out just by pushing them around manually or even doing simple electronics diagnostics. Poverty has taught me that if it's broken, even if I might destroy it completely, I'd might as well try to fix it, because I certainly can't afford a new one. Amazing how many times the broken part is a stupid little plastic piece, which can sometimes be glued back together or even replaced with something I carve myself out of another piece of plastic. Other times, it's just a loose wire, or a tiny piece that I can replace from the hardware store. My "destroy" versus "repair" rate has gone up and down over the decades, and the downs are mainly on the device makers, creating no-repair appliances that have every intention of forcing you to buy a new one. The better luck seems to come with fewer computerized bells and whistles.
@@roberthill5549 Unfortunately those of us that know how to fix things are meeting with so much resistance from manufacturers on access to parts and even facing copyright infringement for importing the base parts for things. We really need a Right to Repair bill.
Robert Hill Yes indeed. Besides Mr. Fielding’s channel, I also enjoy Mustie1. Similar verbal delivery tone, excellent teacher and both of them teach how to build, repair, repurpose items that most people would dispose of. I thoroughly enjoy this channel for that reason. I’ve rebuilt a lot of electric fans that I use to cool my garage while I putter around in it. Lots of free stuff is out there because people don’t have the basic knowledge needed to fix it. Mr. Fielding teaches the basics (and more) for free, and does a fine job of it.
This is the first video of Jeremy's that I have seen. I think he had a very strong set of mentors to guide his thinking process. His approach is very much like what I had in my early mechanical development. I had 3 gentlemen that guided me to a strong mechanical field in the military, thermonuclear missiles. I taught repair and assembly for over 6 years and managed the extension course while teaching for another 6 years. I miss the teaching. My mentors were diverse. One owned a repair garage and yes, he taught me a lot of thinking processes. I had the chance to learn tune ups from him. Did my first one on my 10th birthday. Second was a watch repairman. Same skills, but on a much smaller scale. Plus, anything we couldn't fix that the owner didn't want, I hung up in a tree and we would shoot a 22 at it until it fell apart. Last was an engineer. I never did find out what type, but his analytical mind was used to refine my thinking in an awful lot of applications. Jeremy, thanks for bringing back many memories and some of the best explanations of different motors for the novice to learn from. Keep on teaching. MSgt David R. Smyth, USAF, Ret.
@@SAJe_53 HE'S WAY BETTER THAN NDT..............NDT DOESN'T KNOW WHAT HE'S TALKING ABOUT,,,,,,,,,,THIS GUY DOES AND HE SHOWS YOU WHAT HE TALKS ABOUT.............
Thank you for watching! The oldest patent I could find was from 1926. But it seems to have been in regular use by then... fans from the 1920's already had them. Thus variations are likely much older than that.The comment about "specifically the US" is about single phase power... Countries that have three phase power use 3 phase motors which don't need a kick start. We have both 120 and 240 in the US. The motor in this video is 240.
James Watt used something like this on his first steam engine however it actually predates that with Huygens using them on Windmills somewhat earlier. The idea of spinning weights to manage actions at speed has been around for centuries.
When I stared working as a mechanic back in the 90s I blew all the other mechanics away when i started started fixing all the old shop equip. Most of them referred to the motors that clicked as two speed motors and when they quit working they'd shove it onto the corner and forget it I blew there minds when I fixed these types of motors with nothing but sand paper. Did i mention that I was only 17. Thanks to my grandpa an old a.c repair man he showed me enough stuff I was well beyond my years at 17 in maintenance.
My kind of guy, there Sparky. At 12 years old I repaired a half dozen A.M. tube radios and an antique RCA record player (talking 1940's) in my grandparents attic because "they're broken" didn't satisfy my curiosity. Don't change - don't ever let anyone tell you "you can't do that"!
I learn the coolest things from these videos. I’m a 59 year old physicist (retired) running a homestead raising sheep and electric motors are an important part of our wood shop, machine shop and many powered vehicles and physical plants around the farm. This particular video just saved me about $600.00 on an industrial suction system for picking up cut grass-hay and bundling it in 64 cubic foot cubes to feed through a crusher and pellet maker for animal feed. You’re my new professor!
Just lick your fingers and push then on the contacts. After that they should be discharged and you can safely handle them without worrying about arching them on metal objects.
I promise you will only have to do it once. Much like being told not to touch something hot as a kid. No one ever believes it is that big of a deal until it happens to them. I got lucky mine was ~25 years ago installing a car stereo; I shorted a 0.5 Farad cap and it scared the shit out of me. Few years ago I saw a maintenance guy in a factory crawl inside a huge industrial milling machine to do an electrical repair. He locked-out and all the routine safety stuff, but didn't have on his ESD gear and didn't think twice about the multiple 5 Farad caps used for starting the huge motors. Apparently it got him good cause he went to the hospital on a gurney.
@@gizmogremlin1872 While you are just having a joke a stupid person might do it and that would be a good way to get someone killed over a bit of lame humor.
These also serve double duty as a safety device on namely electric clothes dryers (double pole), if for any reason the motor for blower and drum stops it also kills heat.
@@dundalkmacgyver800 Unless the convection oven has manual fan control. Those can be used as either conventional or convection, and thus do not shut down heat when the fan is not running (present on some Vulcan ovens).
@@nuclearusa16120 Being more specific, that's correct. That type of convection oven (with manual fan control option) is less common, and are found in commercial gas ranges with oven (Vulcan is one make). Still, most commercial gas ranges with convection ovens use a normally open centrifugal switch in the fan motor. Almost all stand-alone commercial gas convection ovens use a normally open centrifugal switch in the fan motor. The one exception that I know of is a Montague model that has manual fan control.
There are some old mechanisms that are just really interesting. A hundred years ago, people were designing fascinating mechanical devices. Take a look inside a sewing machine to see clever ways engineers transformed rotary motion into lots of kinds of linear motions. Very well explained. Great video, Jeremy!
You, my friend, are a wonderful teacher. This is the first video I've seen of yours, and I'm subscribing even though I don't know what else you've posted. I'm also a teacher. I'm typically very critical whenever I listen to other teachers who can not get right down to the point, and who can not answer all the questions BEFORE a student has a chance to ask, and you've done both extremely well. You have a wonderful gift...I trust you continue to use it well.
I'm actually really proud of myself for knowing about this! I started an apprenticeship at an AC motor repair shop and I've really gotten to know Single phase motors. They're super simple but they are the neatest thing!
The Centrifugal switch was a reinterpretation of an older invention. "Centrifugal governors were invented by Christiaan Huygens and used to regulate the distance and pressure between millstones in windmills in the 17th century.[1][2] In 1788, James Watt adapted one to control his steam engine where it regulates the admission of steam into the cylinder(s)[3], a development that proved so important he is sometimes called the inventor." - Wikipedia
Thanks, I was going to ask how this device is different to a governor on static engines I’ve seen (diesel wool clipper engines, fruit packing engines etc) which I was told were the same as used on James Watts’ steam engines. Apparently no different - in concept as least.
Julian Morrisco does a governor control speed in an analogue way, but this is a speed dependent switch in a binary way? (That made more sense in my head!)
Yeah, I was thinking that spark was the capacitor discharging so (as you mentioned) unplugging wouldn't have helped prevent it. Next video: Repairs a CRT.
Just so you know, whenever there's a capacitor involved make sure it's discharged before you go poking in there. Capacitors can kill. Normally you just wait several minutes after unplugging the device, and/or turn it on unplugged (some devices have been known to run for a fraction of a second when powered on unplugged, that means something is storing juice). Then using a screwdriver touch both contacts to make sure there's no spark flying.
Royal Lee An 1920s patent for a centrifugal switch (US Patent #1,630,394) was granted to Royal Lee on May 31, 1927. It was the basis for the formation of the Lee Engineering Company.
I have been repairing appliances for 40 years.. I have seen and repaired this type centrifugal switch and relay combination many times.. You did a good job explaining the mechanism.. Thank you for your service to the field..
You always come up with something fascinating. Well done Jeremy! And the title and image are Just Fine! Do what you feel and don't listen to anybody detracting from that.
think I just discovered the problem with a large extractor fan that one day just refused to run up to speed. Had another one nearly as good so just biffed it into the barn somewhere, years ago. Might now go and look for it again. Thank you.
This was like a more practical "Technology Connections."i love learning about clever mechanisms. Could you manage to get some high speed video of this?
@@taxicamel "or more correctly CENTRIPETAL force" let me guess, you think there's some kind of conspiracy to keep the power of the CENTRIPETAL force from the people, and that's why people always correct you and tell you it's centrifugal? it's centrifugal. as in, the force that shares its name with a Centrifuge. There is no such thing as a Centripet. I would think this was a troll post if you didn't actually know how these switches are integrated. Seems like you're actually just some old dumb coot.
Thank you for being such an honest young scientist! People like you give me hope for a brighter future. There are too many people in this world that are willing to lie for money. You are a great teacher! Thank you!!
Very nice video! One minor point - very often contact points like those you cleaned with sandpaper here are plated with coatings that make them more resistant to damage by arcing. Once those coatings are gone, the contacts need to be replaced. You can get some more life out of it by cleaning off the burnt material with sandpaper, but it will very quickly build up more insulating burnt material because the base metal (which is now exposed without a coating) oxidizes very quickly compared to the coating material (which is usually something very expensive and with a very high melting point, like platinum or rhodium).
Is there a paste or other coating that you know of that could coat the plates to protect them and allow for conductivity, when doing a repair like this?
For things like this, I usually steal an emery board from my wife. It got to the point a couple of years ago that she just bought me a small package of cheap ones for me to use on this kind of stuff.
To slow the corrosion and/or carbon buildup again, after using anything like sandpaper or emery board, burnish the contacts. At least polish them as much as you can with progressively finer emery cloth or boards.
The magic red Scotchbrite pads do this beautifully without removing more than the oxidation. I've used them for many years with electrical contacts, just be sure to blow off the debris when you're finished polishing.
Yes, Adam Savage has a video on his Tested series that talks about how he used to glue strips of sandpaper to Popsicle sticks until he discovered you can buy nail files in an assortment of different grits.
YOU ARE EXCEPTIONAL I've seen a lot of videos in my 52 years and you have a special gift to be able to teach in a very insightful and concise but fun way. Your video breaks and clips are excellent and your timing plus speech pattern is engaging and very clear. Thank you so much for sharing this with me and so many others that truly appreciate it. Bless you and yours in 2022
Interestingly, I knew how it worked and why, have a couple motors where it's failed and they need kick-starting... but I've never actually _seen_ the centrifugal clutch! Just never gotten around to fixing one. Neat to see.
The centrifugal switch, and start capacitor, create a second magnetic field sets up a rotating magnetic field. It is the rotating magnetic field that creates the starting torque. 3 phase motors naturally have a rotating field.
I repaired my 2hp table noize motor and that was my introduction to that little doojabbely action mess! I didn’t even watch this video! I saw your videos toenail image and knew exactly what it was! When I first saw it in my motor and how it works my mind blew. Someone thought that little theengee up and then made it!.....work! People are neet 🙂
Thanks for a neat video! Also, be sure the multi-meter is set to the correct measuring scale. I tried to check voltage on a 240 volt circuit with the multi-meter set to Ohms. The new multi-meter wasn't really That expensive...
Jeremy Fielding, I wish you had been my neighbor about 8 years ago when I was working on my washing machine. I replaced the capacitor but the problem was the centrifugal switch in my motor. The "repairman" that Sears sent out didn't help at all (He was no "Jeremy Fielding"). I bit the bullet and bought a new motor but not from Sears. Hey, I had clothes to wash. I kept the old motor and now I'm going to try to fix the centrifugal switch.
@@280zone No, he said he kept the motor. So just like the rest of us he'll go out to where he thinks it is, then call off the search after about 10 minutes. The good news is he will find something else he remembers looking for recently but can't seem to remember what he needed it for (again, just like the rest of us).
@@Milkmans_Son he will then put the thing he was previously looking for in an obvious spot. Years later, when he remembers what he was gonna do, he won't be able to find it, but he will find the motor, and put that in an obvious spot. Years later, ...
yep he shorted it and i guess there is enough juice in the condensor to beam across the tabs. thats why you should always be careful around condensors. they can shock you even when there is no power going to the thing youre working on.
@@taxicamel Thank you brother. would you believe he posted a video on induction motors 2017 I just found ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-2XYdTogWcIA.html
You have great style, communicate clearly, very knowledgeable… somebody in television needs to make you the Bob Villa of home and machine repairs! Awesome.
Good, informative video. I went through this issue on my (relatively new) milling machine. One thing you can add to list of diagnostics is if the motor suddenly starts sounding 'mechanical' like a loud BrrRRT noise or humming sound. I can't say whats going on electrically to explain that, maybe you can. The caps were new & checked out fine. But the CS points looked a bit smokey & very mildly pitted. So I dressed them & put CS back in service like you did. That worked for quite a while then the same problem arose. Turns out these devices are kind of sensitive to how they are positioned on the shaft before the set screw locks them down. Or maybe a better way of saying is how much tension is holding the points via the spring plate. If its too soft for whatever you may develop partial contact & maybe why it develops the same problem over time. I had to play around with this a bit & that seems to have fixed the issue. Another potential problem source is if the motor has a fan blade over the CS area. If the fan is improperly positioned along the shaft or is a bit loose & migrates over time to the extent the CS counterweights are impeded, that will also cause start problems.
At last, to find someone who understands how things work and how to fix them including with sandpaper, doesn't just swap random parts until eventually half the parts are replaced and it starts working by luck (I get so irritated by supposedly skilled engineers who do that). You are an endangered species, respect to you!
😎 Hey, Jeremy: Ask your wife for a couple of "emery boards," for filing and smoothing her fingernails! 💅Very good for cleaning contacts! Really enjoy your work! 👍
This is the best tutorial/how to video I've seen in s long time. Informative, interesting, clear, and entertaining. I'll be making this channel a regular in my routine.
Back in the 70's I was a car mechanic specializing in tune-ups and ignition systems. I always marveled at the innards of the distributor. (Points/Condenser) This is different... but the same. :)
usmcbrat2 That is exactly what I was thinking when he was sanding the contacts. I remember using an ignition file to gently file a set of points that had become burned in the days before electronic ignition.
@@Freespirit5371 The transition to electronic ignition systems made the tune-up business boring to me. With older cars there was something to fix/work on/understand. With new cars the ignition system became a "magic box" and when it broke you made the customer buy a new one.
I always wondered what that clicking sound was. I'll be looking out for this switch next time I take something apart. Great video, subbed, keep it up..
5:09 you should not get one with higher capacitance. the capacitance value was chosen for a specific reason to give the correct phase delay on the start winding which has a fixed inductance so choose something close to what was already there +- 10% or even 20% is probably fine but you should not deviate more then that. remember the purpose of the capacitor is to create a rotating magnetic field in the winding from a single phase source so the capacitor chosen needs to be a specific value to accomplish this. the voltage rating is just that, the maximum rated voltage for the capacitor so as long as it is greater then or equal to the current working voltage then you are good.
@@darth1000blue starting uses higher loads than running. While generally a circuit won't pull more load than available, some big capacitors will still discharge more load than the circuit pulls. If you aren't properly accounting for this you get a nice big bang.
Also, just want to say, I've been watching and subscribed since you were building the tiny workshop, and its been so cool to watch your channel and content grow. I love how approachable you make your content. Happy to follow :D
Really good info! It helped getting the long-dormant attic exhaust fan in my house going again. The switch was stuck in the closed position from being off so long and the motor sounded extremely unhappy. I just had to clean and lube the switch a bit to get it moving again, the hardest part was getting the motor off the fan. The start cap was also replaced just as a preventative measure, it was only about $10 in my case. Really is amazing that it still works fine after all this time with a little care (installed in 1962). Thanks!
I don't know the exact technological lineage, but you could imagine this being a further development from the ideas that led to the centrifugal governor for mills and later on steam engines. It was invented by genius polymath Christiaan Huygens in the 1600's!
Hello neighbor, when replacing a capacitor you can in deed use a higher voltage rated capacitor, but you can only go 20% above the the original capacitance (uf), otherwise you'll cause windings overheating, damaging the motor in the long term
I remember when affordable electrolytic capacitors routinely had a tolerance of -20% to +100%. So a capacitor rated at 100 mfd could still be in spec as long as its true capacitance was between 80 and 200 mfd. Were motor start capacitors more precise than that 30 or more years ago?
@@leehaelters6182 Any resistor above 1kΩ should work, anything less might dissipate too much power too quickly. The higher the resistor, the longer it will take to discharge the capacitor. Some capacitors like this have a permanently installed high-value resistor across them (about 100kΩ) called a "bleeder resistor", which is too high a value to affect the operating circuit, but will discharge the capacitor to a safe level after only a few seconds.
I had an old Sharp portable "boombox" that had that exact mechanism on the motor. I loved it and miss it still the battery life on that thing was awesome. Come to think of it i will scour ebay for a well preserved one.
Was learning about these in HVAC school today and remembered I had seen this video a year or so ago. So I looked it up again in order to fully understand the concept for class! Thanks!
@@SH-pc4xt ,...some find the news energizing - they really get amped up, others probably meditate on how much resistance they should give to that claim: "ohm" 😉
Those "tabs" are CONTACTS. Going straight to sandpaper will indeed scratch off the carbon deposits, but will also scrape off the PLATING from the contacts leaving them highly susceptible to future failure. If contact cleaner and a piece of cloth do not work, then first resort to emery cloth with super fine grit. I hope this info helps you and others to avoid having to do this same repair again very soon. Also, leaving the power on while testing made this a more costly repair (Didn't you destroy your meter's continuity setting? DOH!).
Starter capacitor and running capacitor. Haven't seen one in any motors I've came across. We have 230vac single phase and 400vac tri phase tho. Lower currens and bigger motors are tri phase, and those don't need a start capacitor. A replacement, more cost effective current shunt and a triac: once current on shunt rises above triac gate trigger voltage triac opens up and runs capacitor/starting coil. Shunt needs to be power rated and calculated resistance for the specific motor, just like the springs, and its a solid state thingamabob.
... or an automotive point file - assuming you still can get them at an auto parts store. My time as a mechanic was in the early '80s, though, so I guess this really dates me.
Never seen before this device. Well, I’m in Europe. When you clean connects, NEVER use a sandpaper of that coarseness. If you want to use emery paper it should be very fine like 600. It takes time but is much better as the contacts have very delicate surface. The better the surface the better it conducts current. I have used a glass fiber scraper pen which has very thin threads or rough cardboard. Usual old style postcard without any gloss is good. It doesn’t harm the surface.
After commenting on another of your videos on this subject this one here is exactly what i needed to see the part in cleaning the contacts of the clutch! Also, the symptoms that are associated with a bad contact! Thanks!!
I am going into my senior and final year as an Aerospace Engineering student and it's unfortunate we don't learn about cool mechanical devices like these in our day-to-day. Our curriculum includes control engineering courses, aero-thermo-fluid dynamics courses, systems, ethical engineering courses, but I wish there is a required course where we get to marvel at and break down devices that efficiently utilize engineering principles and that compose universal engineering feats like motors, engines, transmissions, heaters, air conditioning, you name it. I also think the lack of writing in the engineering department is abysmal and this is one way that we could incorporate and hone our technical communication skills, because if we are to articulate how these devices operate and are graded accordingly, then that is true understanding and learning. That was a bit of rant, maybe I'll write to our Head of Department ;). Thanks for the awesome video. I found your channel today!
at least you realize your education is full of holes and bullshit, and they didnt really teach you the basics required to be a good engineer. hopefully you will educate yourself over your life and become something truly rare. a good humble engineer. There arent many. and even less in aerospace.
Very good video and very informative. I would caution against sanding the contacts on the stationary switch though. Very often the contacts are silver played with a coasting on top to prevent welding and pitting. If the contacts are pitted I would recommend replacing the stationary switch as well as the centrifugal switch. If the contacts weld it can cause the start circuit to stay in even if the centrifugal switch functions. Also, when replacing capacitors, if there is a resistor between the terminals make sure the replacement has that as well. The resistor is used in motors that have more on/off cycling to remove residual charge from the capacitor and help eliminate contract welding.
Sir, I’m going to share this with a friend of mine who is teaching his grandchildren to repair cars and such. Thank you for sharing your knowledge with others. and your enthusiasm. Just imagine if we all knew more about how things work, how to get them to last longer and we all demanded as consumers that products be made to last instead of made to fail a few days after the warranty period is over.
You did not mention that 3 phase motors neither need the capacitor or the "centrifugal" switch. Single phase motors need to be "tricked" into starting, the need for a phase change to make the motor "think" there are 3 phases. The capacitor synthesizes the 3rd phase temporarily to get the motor started. Once the motor is turning, only single phase power is required .
That is exactly the reason of The capacitor. It changes the phase of the incoming line and create a second phase and though a starting wind causes the motor to start sniping and also on the right direction, after that the clutch disconnect the starting circuit and continues to run in a single phase.
It synthesize a 2nd phase, not a 3rd. Even a Y wound 3 phase motor will start and run (poorly) on 2 phases. There used to be 2 phases motors that used 2 phases with 90° between them.
Love your channel!!! I worked in hydro power for a while back in school. Those little cylinders you see on top of big hydro generators are centrifugal speed governors. Little balls on arms that swing up or down due to speed, controlling a hydraulic valve which controls bigger hydraulic valves which open or close wicket gates allowing more or less water through the turbine. Absolutely fascinating design!! I recently toured the Ford Museum and almost every old machine had the set of two balls on rods on top which were all speed governors. Woodward has historically been a maker of such devices.
