Industrial Maintenance 101: Electric Motor Disassembly/Reassembly

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Laney Machine Tech - Classroom Content

2 жыл бұрын

Let's tear down an electric motor!
This video is a walkthrough of a hands-on lab activity for a summer skilled trades exploration course at Laney College in Oakland, CA. It is intended to demonstrate some of the day-to-day job tasks which would be performed by an Industrial Maintenance Mechanic. Students with no prior knowledge should be able to disassemble and reassemble an identical electric motor as shown in the video during a three hour session. I hope this video will be useful for students and apprentices, as well as for training coordinators and instructors looking for curriculum. Grab a motor and some hand tools and follow along!
The demonstration covers the construction of electric motors, names of various components, some common hand tools used in assembly work, procedures for disassembling and reassembling a typical industrial electric motor, removing and installing ball bearings (with a hydraulic press), tips for successful disassembly and reassembly.
You can find the written instructions here: laney.edu/machine_technology/w...
Timestamps:
0:09 Introduction and “What is an electric motor?”
0:49 Tools we’ll be using: 1/4” and 5/16” sockets and driver (or similar), soft-faced mallet or “dead blow” hammer, 4 pieces of wood (2x2). In addition to those mentioned during this section, we’ll need drive pin punches or another similar device.
2:49 Electric motor construction and strategy for disassembly
3:33 Removing the electrical wiring cover
4:22 Three tips for successful disassembly and reassembly: 1) organize components as you remove them, 2) take lots of pictures, and 3) match mark all components which can be installed in multiple orientations.
6:29 Removing the long screws which clamp the end bells together - these are sometimes called “tie rods”
7:57 Backing off the bearing clips in the front end bell
8:32 Removing the rotor shaft and rear end bell
8:56 Removing the rear end bell from the shaft
9:17 Removing plastic electrical enclosure
10:37 Removing wavy washer/disc spring for rear bearing
11:35 Removing the front end bell from the stator frame
13:19 Summary of components
14:23 Removing the rear bearing from the shaft with a hydraulic press
16:59 Removing the front bearing
18:32 Reinstalling the bearings *NOTE: I forgot to turn on the camera when reinstalling the rear bearing. So only the front bearing is shown being reinstalled. The methods are substantially the same. Just make sure to use the short section of pipe to push on the inner ring of the bearing.
20:11 Strategy for reassembly
20:28 Assembling shaft in front end bell
20:59 Assembling stator frame
21:28 Assembling rear end bell with plastic electrical enclosure and wavy washer/disc spring
22:56 Assembling the long screws/tie rods which clamp the end bells together
24:40 Assembling the electrical wiring cover
25:08 Tightening the bearing clips in the front end bell
25:34 Marveling at our accomplishments
For more about Laney College, check out the website: laney.edu/machine_technology/
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Пікірлер: 69

@saintlunaticv3602 Ай бұрын

I used to diagnose and repair electric motors. For very small shops with limited space, inductive bearing heaters are a great option for removing bearings. Great video as alwaysvmy friend.

@logicaljuan 6 ай бұрын

Good video and strong jumping off /intro to motor repair. In the field (as opposed to a shop), we typically use pullers to remove the bearings and heaters (induction commonly) to replace the bearings.

@kevinrblodgett 2 жыл бұрын

Simple but I appreciate seeing it all broken down. Thanks!

@syedsayeedurrahmanzaini4221 Ай бұрын

Well explained video showing the proper way of dismantling and reassembling the electrical motors. Thank you very much.

@viniciusspaceandlife7388 Жыл бұрын

Thanks a lot from Brazil, mate! It was of great help.

@TernElectricMotorDistribution 3 ай бұрын

Great video and easy to follow for anyone starting out in the electric motor repair business.

@Drum93bum 2 ай бұрын

I actually learned a lot in this video thanks!

@c182SkylaneRG 5 ай бұрын

So what would the differences be if this motor was explosion proof? I've recently been schooled on the method of piping the wires where they come out of the motor, and filling that pipe with cement, but we weren't able to get the motor housing apart to see how that was assembled. Doesn't seem like you'd be able to fill the motor housing with cement, though, or else it would lock the rotor in place, so now you've got me curious. Thanks!

@dumpsterdave3710 2 жыл бұрын

The real question is how Robin Renzetti would skin a cat... Another great video, Adam. Thanks for always presenting things in a clear, easy-to-follow manner.

@laneymachinetechclassroom 2 жыл бұрын

Robin doesn’t skin cats. He performs feline epidermectomy.

@merchantoftruth6637 11 ай бұрын

I’ve been having trouble with my electric motors on my floor machine that I need for my cleaning business. I’ve had quite the challenge, finding somebody who can work on these motors. Finally, I found a company who may have time in the next couple weeks. While I was there. I learned that they are thinking about closing their business this winter, and then came up with the thought that maybe perhaps I could buy it, that’s what I found your video. I thought I should learn how to work on electric motors before I get into a business like this. Is there a place that teaches you how to work on electric motors?? Your video was very good and thorough. Thank you for posting.

@THIRTYSIXRED 2 ай бұрын

@merchantoftruth6637. I worked for an electric motor repair shop. Most of the building employees were former US Navy. One of the only places you will learn the skills needed

@markcagle2158 Жыл бұрын

Very good video sir . And the “ oddly blue colored grease “ is very typical for electric motors .

@THIRTYSIXRED 2 ай бұрын

Agreed. Mobil Polyrex EM

@harmonysalem9377 4 ай бұрын

Merci from Montreal Canada

@johnvandewege7607 2 жыл бұрын

Thank you, always clear and well presented.

@mojokahma6931 7 ай бұрын

My trade was rewind electric motors, In Australia we have 240v 1 phase and 440 v 3 phase and 480 2 phase, I could still pull 1 apart without any problem. use a center punch to mark the end housing locating.

@garbo8962 6 ай бұрын

Wow two phase. Have not came across a two phase motor in over 20 years here in USA. I have a few if them up and installed 3 to 2 & 2 to 3 phase changers. Recently attempted to locate one thru the internet rated 30 & 60 amps 250 volt four fuse safety switches with no luck. Back in the 1970's a two phase safety switch cost twice as much as a three phase switch. Philadelphia & Detroit still has some old two phase services from the local electrical provider.

@Lucas-Nasci.Pra.Adorar 3 ай бұрын

Hello my friend! I’m from Brazil! This video is helping me to improve my English. Thanks!

@_P0tat07_ 2 жыл бұрын

You never told people to disconnect the motor from power first!🤣 These motors are often compatible across different brands. I had 2 motors, one a non working motor with the right length shaft and a working motor with a shaft that was too short. Different brand motors, but I swapped the rotor out and it worked great. I do remember the back bell cap not seeing all the way because the back bearing was out just a bit further on the replacement rotor, so naturally, I just used the bell cap from the other motor and it fit together perfect. Just make sure the motors are for example both 120v single phase or both 240v etc, etc. Also, when I install the back cap, I don’t tap it in until I get all 4 screws started in their threaded holes. That way I can twist the cap slightly if I need to. Then tap it down and tighten the screws.

@ginawhite1503 2 жыл бұрын

Now I just need to come up with a motor to take apart!

@raynemitchell2910 Жыл бұрын

Thanks for the video!! I’ve been a commercial construction worker for ten years (never done many thing else) New industrial maintenance trying to get ahead of the curve. Im more lacking the electrical are of things. Any videos or advice you can point me toward to help me learn this stuff outside of work?

@Avery_F Жыл бұрын

Jim Pytel

@paulcolgan9316 3 ай бұрын

My cement mixer Motero starts good however when running for 3 minutes the mixer stops running can you advise please.

@PerilNotion 5 ай бұрын

Ive never had such an in depth description given to me on what 1/4" drive socket consists of being or had the functionality of a nut driver broken down to me in slow motion.

@mikedezotell5730 3 ай бұрын

Great video to let me know what I’m getting myself into. The only question that I have is the two clips that held the one bearing under the main cap. Those clips seem to be free spinning. So should you have not put them in place first and at least snugged them down before you put that cover onto the stater? Otherwise they may have never properly engaged the bearing?

@haroldabbott2200 Ай бұрын

Yes, my observation as well. Should have been snugged as you suggested and now "it's too late". Also, given the somewhat condescending nature of this tutorial, there really should be some caution on the proper torque for all those fine-threaded bolts. Still, a good little video IF you have a clean, brand-new motor.

@cowthedestroyer 8 ай бұрын

You can always pop the seals off the bearings with a pick. I like using a starrett scribe and then you clean out the bearings and back them in place without removing it from the shaft

@logicaljuan 6 ай бұрын

These bearings are sealed and this motor is clearly designed only for sealed bearing. There are no grease ports. So pulling the seals off the bearings would be a less than optimal choice for bearing life as the seals/shields help keep the grease in and contamination out.

@cowthedestroyer 6 ай бұрын

@@logicaljuan you can put the shield back when you are done it doesn't damage them

@logicaljuan 6 ай бұрын

@@cowthedestroyerThat’s possible. But typically, most would actually just replace small inexpensive bearings like these in the video. In fact… if it were a little motor like this in the field most would just replace the whole motor and not bother with opening it (unless it was highly specialized-expensive and/or had a long lead time).

@geerap8746 2 ай бұрын

Awesome just subscribed 👍

@goblinslayer77 Жыл бұрын

awesome educational video sir, thank you.

@mcstrangelove Жыл бұрын

How did you pull the shaft/rotor/bearing assembly out so easily from the stator/motor casing? My rotor is magnetically stuck to the inside of the stator. When I try to pull the assembly out of the motor housing, the magnetic force is so powerful it yanks the rotor back inside. I could probably force it out but don't want to damage it. There's no power going to the motor so I'm not sure how the electromagnet is holding the rotor in so tightly.

@garbo8962 6 ай бұрын

Only time that I had what you called magnetically held was a PM DC ( permanent magnet ) motor. Might take two.people. One pulling shaft & the second person pushing on opposite end. They expect these strong magnets only an aluminum frame. Maybe one out of every 3 or 4 burnt bout PM could I remove these magnets in one piece. Never came across one over 1 or 2 HP.

@garbo8962 6 ай бұрын

@Not-C-418 2 жыл бұрын

Yooo, where have you been man missed you and your videos

@ricetogo 2 ай бұрын

What causes the motor to have drag and hard to turn?

@patbobsquidpants3159 Жыл бұрын

Very very very simple machine.... if that was the case nobody wouldnbe watching this lol but im learning so thanks for vid

@AdanechWordofa 10 ай бұрын

I am from Ethiopia nice class am industry student in collage can I get better knowledge from you

@behelpful1435 Жыл бұрын

What kind of motor is this? 3 phase? Synchronous?

@logicaljuan 6 ай бұрын

In the video at only 26 seconds you can see the name plate. It tells you it’s a 3 phase motor.

@behelpful1435 6 ай бұрын

@@logicaljuan thank you.

@jimgourgoutis 2 жыл бұрын

Is that a brushless motor?

@laneymachinetechclassroom 2 жыл бұрын

Three Phase AC Electric Motor - the workhorse of industry. I would have loved to go more into the theory and discuss various types of motors. But folks can sign up for our MACH 207 - Mechanical Drives class for that 😉

@carltauber2939 2 жыл бұрын

It's called an AC induction motor because there is no electrical connection to the rotor. Technically it has no brushes, but the term "brushless" is reserved for other types of motors.

@jimgourgoutis 2 жыл бұрын

@@laneymachinetechclassroom That's what I thought -- but I also thought I saw brush caps on the sides of the motor housing (black round thingies). Thanks!

@kng9934 10 ай бұрын

Size bearing ? Where can I to buy it?

@erikspraggins1185 4 күн бұрын

lol I have that exact same Crescent set,

@owencooper2756 7 ай бұрын

Hello fellow tech priest!

@beornjohnson2025 2 жыл бұрын

For a more thorough, if not more, umm... pragmatic, electric motor repair overview, I've enjoyed watching e.g. kzfaq.info/get/bejne/ntN1ZtWp1tSzkYk.html ... (many similar videos available on her channel).

@electriciants7927 5 ай бұрын

Run it..

@EricBrummer 2 жыл бұрын

Woo youtube video!

@laneymachinetechclassroom 2 жыл бұрын

Don’t get too excited 😆

@JemicoTX 8 ай бұрын

Bearing clips should have been tightened WAY before the end (as soon as you put the bearing in front end bell 20:53). The clips needed to be turned 90 degrees to hold the bearing.

@biomed2560 11 ай бұрын

A beautifully clean modern motor. No rust, no oxidation, no seized bolts, no seized and grinding bearings which allow the shaft to slop about. Easy peasy but no relation to the real world.

@FIGGY65 10 ай бұрын

Did you not read the video description, it’s for green students at the Laney College lab. It has nothing to do with the dirty, hamburgered up factors of the real world that you mentioned 😂😎.

@421sap 9 ай бұрын

Praise the Lord! By G-d's help In Father and King Jesus' Name, Amen ✝️✨

@rubenpatton4771 2 жыл бұрын

Pᵣₒmₒˢᵐ

@ImmortalMonk490 2 ай бұрын

My mans had no idea what he was doing the entire video lolol

@victorreppeto7050 11 ай бұрын

And now I'm going to pick my nose off camera, a little too much detail man.

@cmdrriotz5283 Жыл бұрын

Because everybody has a hydraulic press...

@Airtight215 3 ай бұрын

I mean, you can use an arbor press but who doesn’t have a hydraulic press?

@alexcabose723 3 ай бұрын

Don't think too hard about the fancy equipment. Bottle jack or scissors jack, some sturdy wood, a couple metal plates and some sockets and you can get this done. It won't be pretty, but it does work. Replaced plenty of bearings in the middle of nowhere without the "proper" tools.

@Anotherclevername20 3 ай бұрын

My brother in christ I don't even have a motor. Enjoy the video