Electric Motor Lubrication
The major problems are the type of grease, the proper application of the grease, and the frequency of application. Probably the least understood part of the problem is the grease itself. Grease is approximately ninety percent oil and ten percent thickener.
The oil does the lubricating and the thickener keeps the oil in place, picture a sponge holding oil. The problem arises when you mix greases which have different thickeners. Also whenever you purchase shielded or sealed bearings from bearing manufacturers they almost always come with Polyrex EM in them unless you specify something special.
The most common grease used by maintenance departments has a lithium base. This explains why we sometimes see motors which are full of oil, the bearings have failed and the user says there is no oil anywhere near that motor.
Pillow block bearings, DC motors, couplings, and some crane motor manufacturers may use a different grease usually a Lithium baseso be careful not to mix them. Also identical motors running in an Arizona copper mine may require different lube than in the artic circle. As mentioned above, over greasing is a bigger problem than under greasing. Too much grease can act as insulation and overheat the bearing causing premature failure. It can also can move into the motor and contaminate the windings causing expensive repairs.
Attached is a compatibility and frequency guideline to help you in your lubrication needs. Priest Electric offers a bearing maintenance workshop at your plant or at our shop that goes into much more detail on bearing maintenance, contact your salesman or call our shop.
Greasing Procedure Following is the standard procedure for greasing ball bearings:. Bearings should be lubricated at an average frequency as found in Table 3.
Operational environment and type of grease may require more frequent lubrication.Instagram python script
It is recommended that the type of grease used on each motor is recorded in order to avoid premature bearing failure. In many cases, you may be able to standardize the type of grease used in the majority of your motors. It is also good practice to let your motor repair center know the type of grease used in a majority of your motors. It is also good practice to let your motor repair center know the type of grease in case the standard grease used by the repair center conflicts with your standard grease.
This site uses Akismet to reduce spam. Learn how your comment data is processed. Previous Next. Attached is a compatibility and frequency guideline to help you in your lubrication needs, Priest Electric offers a bearing maintenance workshop at your plant or at our shop that goes into much more detail on bearing maintenance, contact your salesman or call our shop.The proper lubrication of electric motor bearings is essential to maintaining them in peak operating condition and, ultimately, in reducing unnecessary downtime.
This bulletin, for Applied thermal fluids customers, is intended to serve as a practical guide to the proper lubrication of electric motor bearings utilizing grease as a lubricant. Grease is frequently used as an electric motor bearing lubricant because of its simplicity of application and unique characteristics.
The primary functions of an electric motor bearing grease are to:. Grease is a semi-solid lubricant composed of a base oil, a thickener and additives. These components are combined in complex chemical reactions under controlled temperatures and pressures. The base oil used in greases may be mineral or synthetic. Mineral oils are adequate for most electric motor bearing applications. However, synthetic base oils may be required for extreme temperature applications or where longer re-greasing intervals are desired.
The thickener primarily serves as a carrier for the oil and prevents it from leaking out of the application. Some common thickeners include metallic soaps that can be composed of calcium, lithium, sodium, aluminum or barium and complex metallic soaps such as lithium-complex. A thickener increasingly employed in electric motor bearing lubrication is polyurea. Polyrex EM utilizes a polyurea thickener. As with many lubricating oils, additives are frequently used to impart special properties to the grease.
Commonly used additives include, corrosion inhibitors, antiwear or extreme pressure agents, oxidation and corrosion inhibitors, pour point depressants, lubricity agents, and dyes or pigments. Your electric motor builder may provide a specific recommendation.
The consistency of a grease should be appropriate to the application, as it affects pumpability and ability to reach the areas to be lubricated.Heathers bootleg ryan mccartan
A NLGI 2 grade grease is the most commonly used in electric motor applications. This extends the life of bearings running at high speeds and high temperatures. EP additives can shorten the life of the grease and should not be recommended where they are not needed. On the other hand, bearings designed to handle heavy thrust loads may require a grease with an EP additive.
Due to the high temperatures that can be reached in an electric motor bearing, a grease with a high dropping point is frequently desirable. An electric motor bearing grease should soften no more than 1 to 1.
An electric motor bearing grease that softens more than that may leak out of the bearing with age. With some exceptions, greases with different types of thickeners should be considered incompatible with each other. We recommend running grease compatibility tests if mixing different greases is unavoidable. Generally, incompatible greases will soften or become fluid.
See information about Cookies. The basic grease selection chart provides you with quick suggestions on the most commonly used greases in typical applications. The chart includes the main selection parameters, such as temperature, speed and load, as well as additional performance information.
Location Login. Back to top. Home Products Lubrication management Lubricants Lubricant selection. Lubricant selection. Selecting a grease can be a delicate process. SKF has developed several tools in order to facilitate the selection of the most suitable lubricant. The wide range of tools available includes those from easy-to-use application driven tables to advanced software allowing for grease selection based upon detailed working conditions.
Basic grease selection The basic grease selection chart provides you with quick suggestions on the most commonly used greases in typical applications. LubeSelect for SKF Greases LubeSelect for SKF Greases provides you a user friendly online tool to select the right grease and suggest lubrication frequency and quantity, while taking the particular conditions of your application into account.
Related links. Grease selection chart Many electric motor failures are bearing related, with the bearings never reaching their intended life. According to the U.
Electric Motor Bearing Greasing and Lubrication
Department of Energy, more than 70 percent of electricity consumed in industry comes from the use of electric motors, which make up 25 percent of all rotating equipment in a plant. This means that electric motors account for nearly 25 percent of the national consumption of electricity.
What all of this means to you is that maximizing your lubrication reliability efforts with electric motors can have a dramatic impact on your uptime and costs, including repairs and replacements, labor, and energy use. Lubrication Engineers has the lubricants, reliability products and expertise to help you put together a complete program to help maximize electric motor bearing life, minimize lubrication problems, and increase safety levels.
Incorrect Grease Selection. Selecting the right grease for electric motor applications can make all the difference in the protection and performance of bearings.
Electric motors require lubricants with specific characteristics. Use of the wrong grease often leads to early electric motor failures.
LE Solution. Other characteristics to look for include good channeling characteristics, low oil bleed, oxidation resistance, anti-wear additives, and mechanical stability. A polyurea thickener system is preferred for most electric motor applications, but grease with an aluminum complex, lithium complex or calcium sulfonate thickener are also good options. Incorrect Grease Application. Common problems include overgreasing, undergreasing, and not greasing at all — all of which can lead to premature electric motor failures.
What You Need To Know About Grease
Additionally, operators often have to manually grease in hard-to-reach or unsafe areas. Your LE consultant can help determine correct lubrication amounts and intervals, and then help you choose which single-point lubricator will work best in your application.
Suitable for indoor and outdoor applications, SPLs decrease motor failures, reduce labor time and improve safety. Grease Cross-Contamination. It is fairly common for a busy operator to pick up a grease gun and apply the wrong grease to the electric motor.
When incompatible greases are mixed, the results can be catastrophic with severe loss of grease performance leading to bearing failure. If manual lubrication is preferred, Clear Grease Guns are the solution for enabling the operator to see the grease before putting it in the application. When combined with a color identification and tagging system, Clear Grease Guns are part of a visual chain of custody for the maintenance operator — significantly reducing human error.
Lubrication Engineers can help put together a lubrication reliability program for your electric motors to help them last longer, eliminating downtime and reducing maintenance costs. Our certified lubrication experts can be onsite to help put together a program that will bring lubrication excellence to your operation. Get started by finding your local LE consultan t or registering to purchase online.The advanced thickener formulation and proprietary manufacturing techniques provide improved bearing performance and protection for long electric motor life.
Outstanding long-life, high-temperature lubrication of ball and roller bearings, particularly in sealed-for-life applications. Increased durability versus conventional polyurea greases when subjected to mechanical shear forces.
Mobil Polyrex EM is suitable for lubrication of ball bearings in many noise-sensitive applications. Mobil Polyrex EM greases are recommended by many major bearing and electric motor manufacturers for long-life lubrication of electric motor ball and roller bearings. Mobil Polyrex EM is more specifically recommended for applications such as vertically mounted bearings, or very large motors where a stiffer grease consistency may be required by the OEM.
Mobil Polyrex EM greases have been shown to be compatible with a number of ExxonMobil lithium complex greases, as well as competitive electric motor mineral polyurea products, as determined by the methodology of ASTM D For specific questions about grease compatibility, contact your Mobil representative. All trademarks used herein are trademarks or registered trademarks of Exxon Mobil Corporation or one of its subsidiaries unless indicated otherwise.How to oil/lubricant a fan motor/ fixing seized fan motor
Typical Properties are typical of those obtained with normal production tolerance and do not constitute a specification. Variations that do not affect product performance are to be expected during normal manufacture and at different blending locations. The information contained herein is subject to change without notice. All products may not be available locally.
For more information, contact your local ExxonMobil contact or visit www. Nothing in this document is intended to override or supersede the corporate separateness of local entities.Admob tips bangla
Responsibility for local action and accountability remains with the local ExxonMobil-affiliate entities. Electric Motor Bearing Grease. Features and Benefits Mobil Polyrex EM and Mobil Polyrex EM offer the following features and benefits: Features Advantages and Potential Benefits Outstanding grease life Outstanding long-life, high-temperature lubrication of ball and roller bearings, particularly in sealed-for-life applications Advanced polyurea thickener Increased durability versus conventional polyurea greases when subjected to mechanical shear forces Excellent corrosion resistance Mobil Polyrex EM and Mobil Polyrex EM provide protection against rust and corrosion.
Mobil Polyrex EM provides additional protection under mild salt-water wash conditions versus Polyrex EM Low-noise properties Mobil Polyrex EM is suitable for lubrication of ball bearings in many noise-sensitive applications.
All Rights Reserved.MM Metalworker Mike Messenger. I'm trying to streamline our greasing at the plant I work at. Right now we have motors with all manner of odd grease in them, and over time I want to re-pack everything so that I know what's out there. Step one is to decide upon some greasing standards. Is there any real drawback to using EP grease in bearings that don't 'need' it?
I just want to come up with two or three greases that I can standardize on, so that I don't have to worry about incompatibility and whatnot. Actually, I should probably make sure the greases are all compatible just in case one of the foremen decide to grab a grease gun when I'm not looking.
They could pump DC motor grease into a pillow block.
Original Post. EH Ed Hudson Advocate. When you buy shielded or sealed bearings now days from any of the major bearing manufactures they pretty much always come with Polyrex EM in them unless you specify something special. The only exception on motors that I know of is crane manufacturers like Eaton-Yale and Harnischfeger put a lithium grease in their custom motors. A lithium grease like this should also work in your grinder bearings.
Big ball bearings on your DC motors should also do well on a polyurea NLGI 2 grease, but the Lithium grease would also work well, just don't mix them. If your big DC motors are vertical type, you might want to use something like Mobilith AW-3 in the bearings. Thanks for the in-depth reply! My lube supplier is trying to convince me that their full-synthetic grease will do everything. I'm not convinced. I'll follow your advice and go with the polyurea for the electric motors.
Lithium certainly seems sensible for the rest of it. I found some information from the Timken company that seems to indicate that some most?
I have to do more investigation on this That would be unfortunate.Q: I shot a bunch of expensive marine-style grease into the bearing buddies on my bass-boat trailer last fall.
It was recommended to me by a marine mechanic as the best product for my trailer, because the wheels get dunked regularly, and this particular type of grease is supposed to be more water-resistant. I finally got a chance to go fishing last weekend and noticed that the grease cups had all leaked oily snot all over my brakes.Mms candida protocol
So instead, I spent the afternoon cleaning and repacking all six wheel bearings and replacing all of the greasy, oily brake shoes. Can you suggest a brand of grease that won't do this?
A: You mentioned the brand of grease in your letter, which I removed, because it's a perfectly good product, and the correct one for your application. Specifically, i t ' s an aluminum-complex grease, and this type of grease has excellent performance when there's a chance of water contamination, like on your trailer.
A primer about grease: It's basically nothing more than a heavy oil mixed with enough soap to make it stringy and clingy enough to remain in place as the bearing spins. This will ensure the bearing's rollers or balls are constantly covered in the oil. The soap is based on a variety of compounds, notably lithium or aluminum complexes for most of the greases used in cars, trucks and boats.
Problem: Not all the soaps are compatible with each other.
How to Determine Grease Compatibility and Why It's Important
This causes the soap and the oil to separate, letting the latter settle to the bottom of the cavity the bearing is in.
No surprise—a lot of grease caps have a poor metal-to-metal seal and will let the oil leak out after some weeks. Like yours did. Your wheel bearings were probably originally lubed with a lithiumcomplex grease, a perfectly good grease for wheel-bearing use, even on a boat trailer if it's maintained. Shooting some more grease into the bearing cap with a grease gun isn't a bad idea.
Shooting an incompatible grease in is. This counterpoints the need to completely remove the last vestiges of old grease from a bearing whenever it's repacked.
Yes, you want to remove the dirt and wear particles, but odds are you won't know what kind of grease the last mechanic used. I'm not going to print a huge grease compatibility chart here, although that kind of information is available on the Internet. If you always clean the bearings properly before repacking, it will never be a problem.
Don't have a nice parts-washing sink with recirculating solvent handy to your driveway? It's still easy to clean the bearings properly. Remove the bearings, inner and outer, and any shims, lockwashers and clamp nuts.
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