Skf bearing handbook for electric motors

The skf bearing maintenance handbook is a comprehensive working guide for the maintenance professional. This list contains bearing information for machinery sold by sears. You can rely on eis for authentic bearings from ntn, schaefflerfag, skf, and more. Your 4000 hp motor could have a large bearing with a 150 to 170 mm bore. For additional information about electric motor applications, refer to the skf handbook rolling bearings in electric motors and generators. The passage of electric current through rolling bearings can cause damage in a. These premium suppliers have developed technical solutions to lubrication challenges and innovative treatments for improved durability. Electric motors port and ship cranes steering gear and rudder bearing davits accommodation ladder fair leads and winches. Bearing handbook for electric motors bearing mechanical. Many electric motor bearings fail due to electric current passage. This skf applications, lubrication and maintenance handbook for bearings in electric motors and generators has been devel oped with various industry specialists in mind. Skf hybrid bearings have rolling elements in nonconductive materials like ceramics, the insulation between rotor and stator is perfect, avoiding all current types to circulate. Electric motor and pump repair industry midpoint bearing.

Releasing the power of skf knowledge engineering australia. Here are couple downloads you might find of interest in achieving better bearing fits. Product specialist, joe conyers, as he goes into more detail on the 12 different tips from the skf bearing handbook for electric motors. Engineering handbook 3 section i bearing symbols nonstandard variants section ii singlerow deep groove, type s singlerow maximum capacity, filling notch, type m selfaligning ball bearings doublerow angular contact, 5000 series singlerow 15 angular contact, type r singlerow angular contact, 7000, 7000p and 7000pj series. Rolling bearings and seals in electric motors and generators. Timken bearing search tool identifies all of the cups related to a cone and all of the cones related to a cup. Another crucial factor for electric motors is energy efficiency. The result is premature failure and high maintenance costs. Electric motor bearing lubrication frequency and quantity. May 22, 2018 join skf maintenance product specialist, joe conyers, as he goes into more detail on the 12 different tips from the skf bearing handbook for electric motors. Figure 4 for motors above 100 hp, both circulating currents and.

Whats the normal operating temperature of bearings. For motors above 100 hp, where both circulating currents and common mode voltages could cause bearing damage, combining an insulated bearing on one end with a shaft grounding ring on the opposite end provides the best protection from electrical bearing damage figure 4. And skf marine has a marinededicated engineering and technical team ready to work with you worldwide for service, advice, maintenance and more. Skf has launched a new application handbook rolling bearings in electric motors and generators. Electric motor greasing the basics howard w penrose, ph. American bearing manufacturer association abma standards nos. Api 682 dual seal design configurations 3 pumping ring designs for dual mechanical seals 3 optimising pumping using variable speed drives 2. This too, is highly influenced by bearing selection. Skf electrical discharge detector pen tked 1 youtube. Are there bearings designed specifically for electric motors.

Skf multilube pumping unit general description the pumping unit is designed for pumping lubricant into central lubrication system. The life of your electric motors with insocoat bearings from skf. Youll often get a temperature spike after adding grease as the bearing ejects the excess into. Rolling bearings and seals in electric motors and generators, that is especially useful for industrial machinery designers and endusers this is the first update since the original handbook was launched by skf in august 2008. Skf product solutions go beyond bearings, housings and seals, to include complete lubrication systems, industryleading condition monitoring systems, advanced. I have a siemens 50 hp model rgzpsd motor whose nameplate indicates the following bearings. Th e bearing on the d end is the guide bearing and means that it can tolerate a limited nonaxial force. Gas driven singlepoint automatic lubricators why automatic lubricators. This global applications handbook consolidates the experiences gained by skf over decades of close cooperation with both manufacturers and users throughout the world. Therefore, is normally accepted that between 20 and. Grease escape grease drain hole, grease trap, grease relief port is important. The widest range of highperformance bearing products to serve your needs across the automotive and industrial markets. As for the typical vibration spectra showing loose fits.

Releasing the power of skf knowledge engineering bearing news. Bearing handbook for electric motors bartlett bearing. Rolling bearings and seals in electric motors and generators, that is especially useful for industrial machinery designers and endusers. Prolong your life the life of your electric motors with insocoat bearings from skf. Bench test data, dupont krytox lubricants, data sheet k236984. Skf multi purpose bearing for 19821987 oldsmobile firenza. Sleeve and clip bearings support high loads, have no moving parts, and require lubricant to allow the shaft to turn smoothly. This bulletin, for exxonmobil customers, is intended to serve as a practical guide to the proper lubrication of electric motor. Siemens motor bearing identification electric motors. The first techtop tech tip highlights our superior bearing regreasing system which utilizes an automatic 57 psi grease purge valve that takes the complication out of bearing. With the aim of passing on to customers and equipment users the knowledge and experience gained in 35 years of magnetic bearing design, skf offers dedicated training sessions in its training facility or on customers site. Skf bearing and seal replacements for electric motors. Skf updates technical handbook for electric motors.

Skf pulp and paper practices compilation of all published issues. With advanced technologies from aegis, koyo, nachi, ntn, schaeffler, skf and timken you are assured of top tier products. Skf rolling bearings seals in electric motors generators. Guide for relubrication and relubrication intervals for grease lubricated ball and roller bearing motors. Incorrect mounting when bearings are mounted cold, care must be taken to ensure the driveup forces are applied to the ring with the interference fit. The only differences between an electric motor bearing and any other bearing are the higher noise standard. I will continue to update this list with actual data. Bearing manufacturers such as skf and fag commonly give a relubrication life period of. Understanding bearing internal clearance machine design. All the associated components must also meet certain basic requirements specifications for shafts and housing support surfaces. Lubrication and contamination together are the cause of 50 % of premature bearing failures. Jul 31, 2014 foreword this skf applications, lubrication and maintenance handbook for bearings and seals in electric motors and generators has been developed with various industry specialists in mind.

Ball bearings are used with applications that have high axial loads and lowtomoderate radial loads. These selfcontained units, which deliver lubrication to bearings at a consistent rate, are particularly useful in remote or hardtoaccess applications, such as exhaust fan motors. Midpoint bearing and our premium brand suppliers are sure to keep your electric motors and pumps running. How an electric motor is installed, lubricated, handled, aligned, and maintained are all critical to the motors performance and longevity.

Skf group is the author of skf bearing maintenance handbook 3. Skf rolling bearings seals in electric motors generators en. As in all bearing applications, this measurement should be taken at the bearing outer ring. This edition includes a new chapter, seals in electric machines, as well as technical information on. Skf research shows that, with proper installation and. Skf e2 energy efficient deep groove ball bearings electric motor flyer skf s contribution to electric motor energy efficiency. May 10, 20 skf is launching a new, updated technical handbook titled. Few failures are the result of true bearing steel fatigue. Oilite refers to chrysler developed oil impregnated sintered. Basic electric motor bearing types, loads and applications. Crc press tribology handbook series pub lished from 1983 to.

Skf bearing handbook for electric motors malloy electric skf bearing analysis experts can identify the cause of bearing failure and help. Skf bearing handbook for electric motors malloy electric skf product solutions go beyond bearings, housings and seals, to 6219. When we talk about motors in this handbook, we also mean generators. Skf s fundamental strength is the ability to continuously develop new technologies then use them to create products that offer competitive advantages to its customers. Jul 31, 2014 a cost effective solution for the traction motor application challenges is the skf trac tion motor bearing unit tmbu. Home electric motors electric motor parts skf premium electric motor bearings. Electric motor bearing lubrication faces new challenges. For antifriction bearings, the following requirements are given in ieee841 severe duty electric motors. Bearing handbook for electric motors free download as pdf file. Skf today announces the launch of the new, updated technical handbook titled. Motor bearing fits require sound references and precision methods to ensure a good fit.

Skf combines handson experience in over 40 industries with knowledge across product platforms. Skf general catalogue, the skf bearing maintenance handbook or consult an skf application engineer. Mounting snl plummer pillow block housings must be mounted properly using the appropriate tools and state of the art mechanical mounting methods. Skf marine offers a full portfolio of high quality components, including the trusted simplex and turbulo products and services. Cyndi nyberg former easa technical support specialist there are two main types of load that act on the bearings of a motor radial and axial. Exxonmobil guide to electric motor bearing lubrication the proper lubrication of electric motor bearings is essential to maintaining them in peak operating condition and, ultimately, in reducing unnecessary downtime. Automatic bearing lubrication system the skf system 24. With the recommendations in this handbook, skf aims to encourage safe and skilful maintenance practices that can help extend bearing service life, reduce machine downtime and minimize unplanned maintenance activities. If its a motor or other machine with a grease relief, open the relief and allow excess grease to escape. Skf bearings cross reference skf bearing interchange. Skf bearing handbook for electric motors bartlett bearing. Skf bearing maintenance handbook, 1996 publication 4100i e. Bearing handbook for electric motors prolong your life the life of your electric motors with insocoat bearings from skf. Skf bearings cross reference skf bearing interchange skf is a popular company that operates in 32 countries and delivers excellent engineering products manufactured in more than 140 sites.

New bearing application handbook for electric motors and. Skf provides tips on troubleshooting bearing temperatures. This is the first update since the original handbook was launched by skf in august 2008. At the end, there is a short list of ball bearing sizes, for reference. Skf is launching a new, updated technical handbook titled. Rolling bearings and seals in electric motors and generators skf. Cable outlet the cable emerges radially from the motor encoder unit. How an electric motor is installed, lubricated, handled, aligned, and maintained are all critical to the motor s performance and longevity. Motors digital direct current domestic electrical installation drill bit drill machine drilling tools earthquake electric air. And since 40% to 70% of motor failures are related to bearings, its no surprise that highquality bearings are key for reliable motors. Radial a radial load is defined as a load that is applied perpendicular to the shaft. Insert bearings y bearings angular contact ball bearings. An example of a radial load would be an overhung load, such as with a sheave.

For more information, or to start a testing program, call us at 800. Improvements in bearing life should not be difficult to justify, especially if it can be readily established that most incidents of bearing distress are caused by lubrication deficiencies. Th e bearings are rigidly mounted to the end shield of the machine. Products for railway applications schaeffler group.

When direct coupled, the stabilized bearing temperature rise at rated load shall not exceed 45 c. Skf group edit da,if you want to know skf bc4b452683a bearings dealer in us. Axial an axial load, also referred to as thrust, is a load that acts parallel. Fag bearing types and designs for traction motors plasma spraying method j20b j20a j20aa 7. Bearing handbook for electric motors waikato bearings skf authorised distribut. This process is a function of time, temperature, speed, load and environment. How to disassemble an electric motor to check and replace the bearings. Maintenance tips for electric motor bearings summary up to 80% of all electric motors are rebuilt due to bearing failure. These large angular contact ball bearings in the sizes 7326 to 7334 fag skf could have large internal clearances. Most electric motors do not contain special bearings. For designers of electric machines1, this handbook provides the information needed to optimize a variety of bearing arrangements. Reassessing lifetime lubricated sealed bearings pump. It is usually of no consequence for equipment such as fans, conveyors, electric motors, and some gearboxes. A guide to the interpretation of vibration frequency and time spectrums.

Rolling bearings in electric motors and generators. Most failures are caused by improper bearing use or inadequate maintenance. Mounted bearings bearing units have a bearing inside a housing unit to ensure a secure fit and mount. Easa senior technical support specialist considerations for lubrication frequency and quantity for electric motors and generators include the following. Insocoat and hybrid bearings demands on traction motor bearings have significantly increased due to the introduction of frequencyconvertercontrolled traction motors for propulsion systems. Skf bearing maintenance handbook engineering books library. Slowly add the proper amount of fresh grease to the application use skf dialset. The electric motor and its bearings are the heart of. The list is generally sorted by the model number after the three digit source code. The ball bearings used in most electric motors are pregreased, shielded ball bearings.

Overview of electric motor condition monitoring solutions from skf. Way more information than you ever wanted on how to fell a tree. Lubrication points are located on the drive and nondrive end of the motor. In this article we will address the above by breaking them down into the.

Epri, power plant electrical reference series, el5036, volume 6, motors. Electric motors account for some of the highest numbers of reliability incident reports involving rotating equipment and machinery. Skf product solutions go beyond bearings, housings and seals, to include complete lubrication systems, industryleading condition monitoring systems, advanced linear and rotary actuation systems, and unique solutions. Monitor the temperature and make sure it doesnt run away. Damage and a resulting bearing failure can occur if the mounting force is trans. In these cases skf hybrid bearings are the preferred solution eradicating electrical erosion issues on motors. For certain applications, automatic bearing lubricators provide an alternative to manual electric motor bearing relubrication. The company is based in sweden and unlike most of the other similar companies, skf focuses on innovation and delivering state of the art products to its. The fixed or locating bearing controls equipment endplay and is commonly closest to the. Radial bearing type, single row, round bore type, 70 mm inside diameter, 125 mm outside diameter, 24 mm width. The skf solution is insocoat inverterduty bearings that require no rework prior to mounting. For sleeve bearings, often alarm is set at 180190f and shutdown is set at 200210f metal temperature. Skf railway technical handbook vol 2 or contact your local skf representative.