I don't know if this might help you but thought I'd let you know this. I've been trained and have been in the hvac/r and electrical fields since 1987 and the way we find the common, run and start are by checking ohms. The highest ohm reading is always between the start and run windings, the lowest ohms is between common and run windings . If you want to check what kind of shape the windings are in then After getting all these ohms readings if you add the 2 lowest ohms together they should equal the highest ohms reading. If they don't equal out then there's a problem in the motor windings that may cause a failure very soon. This way is used in checking a compressor on a heating/cooling unit but should also work on motors since the compressor is just a motor also. Take care
You are the best motor engineering and physics teacher I've ever encountered.I have worked in theater and film/tv as an electrician for 40 years. I've tried to learn theory of electricity and motor control as part of my professional development. You are the BEST resource on the internet for straightforward, concise, and lucid explanations of theoretical and practical information!
I find myself coming back to your videos over and over for two reasons when I need practical implementation information 1. You address the needs of someone teaching themselves and 2. Your explanations are very well articulated. I think the fact that you taught yourself keeps you focused on the real world which is very valuable. People who are formally educated are often good at delivering theory but fall short in practical application. I highly recommend your videos to anyone who needs to actually get things done.
Getting back to basics- I love it. About 10 years ago, Bill Mayo, a Shopsmith rebuilder in Florida, showed me how to take a Shopsmith headstock motor apart & connect a DPDT switch to have both forward & reverse motor rotation. Kinda like surgery. Like you mention, simply looking for the thinner wires made it easy to locate the starting winding. After the first one, only took 15-20 minutes to do. Bill had spent some time in a motor rebuilding shop. Not sure if they even exist anymore. Thanks for sharing.
Jeremy You do amazing work. You make really complicated things very simple. You truly understand what you are teaching as Albert Einstein said "If you can't explain it simply, you don't understand it well enough." Thanks!
Fascinating. Very well made, and a lot more logically explained than most videos I see. Having basically no prior knowledge about motors, I'm finding your tutorials very helpful. Thanks.
I found a compressor - 21 Gallon 3/4 HP - Craftsman...After watching your video I replaced the capacitor. dressed up the motor switch. And I saved it from the dump and its inow in service in my rear pole barn. Thanks for the videos!
I bought a bunch of motors at an estate auction. Three washing machine motors, a couple beefy old induction motors with capacitor on top, a big 220v motor, one with a gear reduction, and a big variac that they thought was a motor. All that went as one lot that no one else bid on, so I got it for $1.
Thank you for this explanation of how to reverse the direction of motors. I didn't even know for sure if it was possible without rewiring the motor. I made a mount for a motor onto a meat grinder. Once it was all hooked up, the grinder spun the wrong way. 😢 I didn't want to re-mount the motor to where it would be hanging off the back. My motor says on the tag to switch the red and black wires to change CW/CCW. Easy! Thanks
Sir let me tel you a short story, you are exactly like me, i work on 2 motor shops on my life,for about 20 years ,i love motors and generators ,but a"m retiring know but i have so many motors in my house ,,,(all kind motors ,DC ,AC SINGLE PHASE, 3 PHASE, all sizes etc,etc and i can not resist play whit motors, even before i start watch this video i play whit a setup G M (MOTOR GENERATOR ) i have in my basement just to see this babies runing on the bench , let me say that,,,,, you are very smart person and a good teacher ,you know what you are doing,tanks for teaching this stuff the right way , i can see you love motors like me ,good bless you end enjoy teaching ,TANKS
I just started watching ur videos and i find them very interesting. Im not into this kind of stuff but i must be honest and admit that u have helped me in so many ways and in helping me use this type of application in motor vehicles. Im a gear head and u would be surprised on how i used ur ideas and methods in cars. So i want to thank u and say keep up the good work and keep enlightening us with ur intelligence. 👍✌️
Looks like you watch about the same stuff that I do ! Also seems like you're doing a lot of the same things that I've done, twenty years ago ! I've always hated wasting anything so would salvage most if not all of parts for my project. I didn't have the Internet for information at the time so you are lucky to have that now. You have good content and are growing your channel so keep it up, like it's said " If you build it, they will come " Thanks for sharing and take care.
You make very good videos. They are clear, concise, and well presented. You often recommend that viewers research subjects on their own to wake up that creativeness inside them. Your videos are useful and just fun to watch. Keep going!
I think this video might have answered my question about reversing rotation on my drill. Now I have to figure how to wire the DPDT switch to do it manually. Thanks Jeremy
where is the capacitor in the first induction motor in this video? is it built into the motor? I have a DPH224L01 I pulled out of an electric dryer, but I'm having a hard time figuring out how to reverse its direction. Does the capacitor have anything to do with changing the direction? I feel like I have tried to switch all of the leads, but its spins the same way.
I have been subscribed to TPAI before finding your channel. Funny part is I found your channel as a recomendation after watching one of his videos. Have an awesone day! :)
Jeremy, Love your channel and I greatly admire your work. I have a situation which I suspect a significant portion of your subscribers may find themselves in. Long story short, I bought a lathe to use in my garage. I converted the 3-phase motor to run on single phase 220 volt power using a Static Phase Controller. It works great but only in one direction. However, the 3-position drum switch no longer works. When I start it, the motor (and chuck) only rotates in one direction. The drum switch doesn't change anything. I have found online wiring diagrams on converting 3-phase motors to single phase 220 volts. I have found wiring diagrams for drum reversing switch's on single and 3-phase motors. But I have not come across the wiring diagram for my particular situation. Other details that may help you. 1. SPC: Phase-A-Matic PAM-300HD static phase converter. 2. Motor: Century brand Squirrel-Cage Induction Polyphase Motor (1.5 HP, model number SC-184-FC4-7). 3. Drum switch: 3-position, Cutler-Hammer Forward-Off-Reverse lever-operated switch. 4. Startup switch: A circuit box equipped with a green start button and a red emergency shutoff switch. 5. Magnetic Starter: GE CR306 Magnetic Starter (NEMA size 00) Let me know if this is something you would like to address. Sincerely, Bill
Jeremy- I knew you would save me. I bent the shaft of a Harbor Freight band saw and put on a craftsman motor I had only to find it went the wrong way. I went right to you for this video and presto! You're like some motor savant or something. You know your shit. Thanks so much for sharing your knowledge. Ron
Thanks, Jeremy, for answering my question of 2 days ago and going to the trouble of adding the link. Sadly it is of no help, it being a much larger capacitor start motor, (mine has no capacitor) and also it has the wires all accessible externally. 220 or 110v - the procedure would be exactly the same, I imagine. Thanks again for trying, but I'm now resigned to further searching to try to find the way to get this motor reversed. Maybe I'll dismantle the motor and mess about with the field coil wires inside......
Thanks for putting in the work to make these videos. The extra effort like mounting the exposed universal motor to better show its construction definitely helps. I look forward to both more of this series and more of the ways you deal with writing in a small space.
You're awesome, Jeremy. This was very helpful. I need to reverse the rotation on an attic exhaust fan and for some reason can't find documentation or a diagram online. Thank you!
Excellence is a pleasure to behold and gains indescribable qualities when said excellence imparts current and enduring value to the witness of said excellence. 'Nuff Said.
This makes perfect sense. Thanks. I have the diagram for my lathe motor, but I cant read it for the life of me. My head don't work that way.. But Thanks to you I can figure it all out with a multi meter. :D
Ha, got the same tach yesterday - thanks for the info, this will be useful in my wiring troubles to bring it back into use. I haven't been able to solve the runaway velocity problem yet - still busy restoring me old lathe
That was a light bulb moment (!) for me: spinning that motor up by hand instead of the start winding and then changing its direction. I'm a pretty experienced workshop guy, I guess - but electrical gear always seemed a bit impenetrable and frightening. Not anymore. Thank you so much.
One thing to note on reversing dc motors.. DC motors have brushes and commuters that the brushed ride on. When it gets used to being run in one direction the brushed get worn a certain way. Reversing that DC motor is rough on the brushes and the commutator. It would be a good idea if you need to reverse a DC motor, to start with fresh brushes. Also note that new brushes usually need to be "worked in" without a load on the motor, for a certain amount of hours - Run the new brushes without a load so you can see that they have worn down to form the curve of the commutator. This enables the brushes to take the full current of the motor.
Please keep them coming. Very excited for a whole series on your new, industrial robot. Reverse engineering, episodes on individual smart design/engineering elements, maybe a while Jarvis 2.0 where you simply reproduce the giant with considerations/adaptions for its smaller stature.
Thank you for your instruction. I know nothing about A/C motors, but I've come across a large industrial fan. Some DYI person added a one phase motor to it. Looks like an old dryer motor (like the gray one on your left). The motor runs in the wrong direction and blows air out the back. I tried reversing the fan, but it worked the same. I'll take the motor off and try your suggestions. Thanks again.
Great Videos! You really should make one showing how to build an electric motor, where the theory applies to any size build/application. Show things like where to get bearings that the shaft spins on, what type of wire to use, what type of shaft is used to make it and where to find it.. etc..I like your videos. keep up the good work!
I am needing to do exactly what you did on the first motor. I replaced the washer motor and it was spinning counterclockwise instead of clockwise. I will try this in the morning.
First off, very good video. I've watched several and you are very good at explaining complex concepts clearly. I would like to add some input to this video. Motor direction, unfortunately, is not standard across all manufactures. NEMA, National Electrical Manufacturers Association, states that motor direction is determined from the non-shaft end, but many manufacturers state rotation from the shaft end (like you are doing in this video). In an effort to clear up any confusion, some manufacturers are now stating CCWSE meaning counter-clockwise from the shaft end or CCWLE meaning counter-clockwise from the lead (non-shaft) end. I truly only point this out to hopefully help those who may get confused by motor direction as stated by the manufacturer. Again, you do a very good job with your videos. I look forward to more in the future.
My source for maintaining this view support.industry.siemens.com/cs/document/60605536/defining-the-direction-of-motor-rotation?dti=0&lc=en-US. I am not aware of NEMA having a different reference
Jeremy, NEMA MG-1-2016 Rev 2 Para 14.6 - Direction of Rotation - ...the standard direction for dc motors and single phase ac motors is counterclockwise, when viewed from the lead end of the motor. (the lead end is defined as opposite the shaft end of a motor)
Thanks for the great video and the very generous links to other great motor video. I keep adding your motor videos to my reference playlist. Love your channel.
Great videos. I would warn people about using vacuum cleaner motors though; they overheat in just a couple of minutes at full speed unless you've got a heck of a lot of air flowing through it.
Maybe unrelated, or maybe subject for a different video, but why are vacuum videos so noisy. It is like universal. Call it a vacuum motor and it will be noisy. Is there anything a body can do to make them run quieter? Thank you Jeremy for all your excellent YTs. You are an amazing teacher.
I find most of the motors, that I have, from dishwashers and washing machines. I schlep the appliance home, scavenge clamps, metal, wire and motor, then set it to the curb again. Usually it's gone in a day or two as metal Scrappers routinely patrol my hood for scrap. I am in Mississauga, Canada.
Do you have any videos on how to test AC & DC motor winding ??? also how would you put together a resistivity meter for underground surveys ???. really enjoy watching your videos . Thanks.
I came into two Bodine gearmotors (NSI-54RL and NSI-33R). My main question, how do I wire the 54RL so I can utilize the F&R function via toggle switch like you have on your lathe. It has two Blue wires and two black wires. Thank you
I noticed with a vacuum cleaner motor that I could run it on 12 volts rather than 120 just by connecting the brushes in parellel with the field windings
And here it is... :) Thank you! Love the switch-a-roo trick for the starter winding and direction of rotation. I wonder if maybe you could speak at some point on protection (Thermal and Shorting), or point me to a link of something you have already done in video or that you know of somewhere else? For example I have repaired a couple of brushed AC motors for my wife's hand held mixers, because nested down between the tape and the windings was a thermal fuse. They work again, but I don't want to give them back to her until I have some sort of fusing system external to the tape on the windings. I'd love to add a fuse port on the back to make it easy, but I don't think that would address the temperature issue of the windings, only current draw. I know someone will say they are so cheap that you might as well get a new one, and we did go out and bought here a heavier duty mixer (Black and Decker of all things! :D ) But these are her favorites, because one was from her mother, and the other also from her mother is her favorite color and goes along with other kitchen items. She went and used these weaker ones meant for frosting on mashed potatoes. ;) As for sources of motors, I see the same basic sources you just mentioned in this video. It's amazing how much people throw away, and it could so easily be fixed or adapted to some other use. I have this one shop vac that only needs new brushes, but they seem to be proprietary and unavailable. Which also leads me to a question... Who's a good company or source for brushes for electric motors? :) I might be able to find something that will work... Thanks again for your videos! Cheers!
I am not sure what to do about the fuse, and I can't think of a good source for what you want, as you are modifying the original design. Brushes are usually very similar in size and shape. You may have to purchase some made for a different machine and shave them to the right shape if needed. At least that is what I would do if I needed custom brushes.
Part one of this video was redone and I deleted the original. You are looking for "how to wire most motors" ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-ZKodxGcRSnw.html
Thank you so much for this for this video! I've been a subscriber for awhile and have watched all of your motor posts. Today I finally fitted an old Leland motor to a very old grinder. After being really proud of myself I turn it on and saw that it was rotating the wrong way. My first thought was to Jeremy. I re-watched this video, found how to get into the motor and then changed the polarity on the start windings. It works like a charm. Thanks again.
oh its amazing the amount of information you provide in your videos. couldyou provide information on how to change a pool pump motor to work like a regular motor. thanks zetuskid
I found two huge motors the other day. When I got them home and had a good look at the labels they read Boeing! Probably something belong to the airport nearby 😬
this is absolutely brilliant mate, how can I SUBSCRIBE 1,000 times, ha ha, question for you during the BONUS TEACHING MOMENT how are you recreating the hum, you taught us that it's due to a faulty capacitor, so are you just omitting one? in other words the momentary switch is keeping it off until you press it?
