Three phase induction motor bearing selection and use

With the progress and development of society, mechanization in the production and life has been widely used. Bearings as an indispensable part of the machine, the use of the range will be more and more widely, because as long as there are rotating places to use the bearings. Bearings in the machinery is mainly from the support and reduce the role of friction, so the bearing accuracy, noise and so directly related to the use of three phase induction motor and life. But the business staff will often encounter some customers that use the best bearings or imported bearings is not high efficiency, which is related to the use of bearings and selection issues. 

But as a qualified sales staff in addition to proficient in their own product knowledge but also proficient in the use of the product, that is, the doctor-type sales, according to the user's supporting product performance, the use of conditions to choose the best supporting bearings. This is the specialized manufacture and sale of electric motor manufacturers.

Because of the wide range of bearings, Maple Motor suppliers will mainly use the most widely used deep groove ball bearings use and selection for some analysis.
一，Three phase induction motor bearing selection
1, the choice of bearing clearance: the user in the purchase of bearings generally only tell in what model, grade, rarely on the bearing clearance requirements, business personnel must ask the use of bearing conditions, including bearing speed, temperature, With the tolerance are directly related to the choice of bearing clearance.
2, the choice of bearing models: bearing model is generally by the user's technical staff according to the supporting conditions of use of products and bear the load to choose the bearing. Business personnel mainly understand the actual load of the user is consistent with the selected bearings, if the bearings can not meet the requirements, as soon as possible to recommend customers to choose the model, but unless the special product in the choice of models generally do not have any problems.
3, the choice of grease: the choice of grease is generally based on bearing speed, temperature conditions, noise requirements and starting torque and other aspects of choice, requiring business personnel to understand the performance of various oils and fats.
4, bearing seal type selection: bearing lubrication can be divided into oil lubrication and grease lubrication.
二, Three phase induction motor bearings should pay attention to the use
1, the bearing assembly: because the bearing is a high-precision products, such as improper assembly is easy to cause damage to the bearing channel, resulting in bearing damage. Bearings in the assembly should have a dedicated mold, can not be tapping, in the press into the shaft when only a small circle of force, pressure circle can only large circle force. Assembly requirements of the use of air pressure or hydraulic pressure in the press up and down when the mold to the outside state, if the tilt will lead to bearing damage due to force, leaving the bearing guide.
2, shaft and bearing room tolerance selection and control: bearing into the bearing should be flexible after the rotation without blocking sense. If there is a clear rotation is not flexible, it means that the size of the shaft is too large, the tolerance to be reduced. If the bearing press into the shaft after the hand rotation has a clear "rust" feeling, it may be too much tolerance of the shaft or shaft roundness is not good. So in the control of shaft and bearing room tolerance should also control the roundness, many electric motor manufacturers only to control the tolerance, there is no control of the roundness.
3, the prevention of paint rust: paint rust is characterized by multiple in the sealed motor, the motor sound in the assembly is very good, but put some time in the warehouse, the motor varies greatly, remove the bearing Serious rust phenomenon. Before many of the three-phase induction motor manufacturers will think that is the bearing of the problem, after our continuous publicity, and now the electric motor suppliers have been aware of the problem is mainly insulating paint. The problem is mainly because the insulating material volatilized out of the acidic substances in a certain temperature, humidity, the formation of corrosive substances, the bearing channel corrosion caused by bearing damage. The problem is currently only a good choice of insulating paint, and after the ventilation in a period of time after the assembly.
4, the installation of foreign body to prevent: the bearing in the load on the rotor to do when the dynamic balance is easy to produce when the iron into the bearing within the balance, it is best to do before the bearing balance. There are some electric motor manufacturers in order to facilitate the assembly, the assembly room in the bearing room coated with some oil or grease from the lubrication effect, but often the operator is difficult to control the amount of good, if the oil or grease in the bearing room accumulated more in the bearing rotation It is easy to enter the bearing inside the shaft. Bearing room is best not to oil or grease, such as non-coated can not be controlled in the bearing room can not stay.

Bearing life is closely related with the manufacture, assembly, use, must be done in every aspect, in order to make the bearing in the best running state, thereby extending the bearing life.

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