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Solutions To Improve The Performance And Reliability Of Global Branded Electric Motor Bearings
Introduction
electric motor bearings are a type of rolling bearing mounted on the rotor shaft of an electric motor, and are also a type of bearing specifically designed for use in electric motors, where their main function is to support and locate the rotor, keep the air gap small and consistent, and transfer the load from the shaft to the motor. electric motor bearings are able to operate at both low and high speeds while minimizing friction losses to ensure smooth, accurate operation of the shaft.
For buyers of global brand electric motor bearings, high-performance bearings can not only ensure stable and efficient operation of motors, but also effectively extend the maintenance cycle and reduce life cycle costs. At the same time, customized bearing design solutions will better meet the special needs of different application scenarios, which will help improve product competitiveness.
Main bearing types and characteristics used in electric motor
- Deep groove ball bearing
Deep groove ball bearings are the most widely used bearings in electric motors.
It has the advantages of compact structure, strong load-bearing capacity and good high-speed performance.
Deep groove ball bearings are suitable for bearing the radial load of the motor and can also bear a certain axial load.
- Tapered Roller Bearings
Tapered roller bearings are widely used in large and medium-sized electric motors.
The main feature of this kind of bearing is that it can bear large radial load and axial load at the same time, and has good load-bearing rigidity and thermal stability.
Usually used in combination with deep groove ball bearings to improve the load-bearing capacity of the motor.
- Angular contact ball bearings
The main function of angular contact ball bearings is to bear the axial load of the motor, and is usually used in combination with deep groove ball bearings.
This kind of bearing has high axial rigidity and can improve the bearing carrying capacity of the motor.
- Needle roller bearings
Needle roller bearings are widely used in high-speed precision motors and have excellent high-speed performance and wear resistance.
Since the rolling elements are slender needle rollers with a small contact area, they can adapt well to high-speed rotation, with low vibration and low noise. Due to its compact structure, it takes up little installation space, is easy to assemble and has relatively low cost, but its carrying capacity is relatively average.
Factors To Be Considered For Bearings In Electric Motor Design
At the stage of designing a motor, choosing the right bearings is one of the key factors in ensuring its performance and reliability. The selection of electric motor bearings not only affects the operating efficiency of the motor, but is also directly related to the service life and maintenance costs of the motor.
First of all, it is necessary to evaluate the load condition of the motor under working condition, including radial load, axial load and dynamic load, etc. Different types of bearings have different load carrying capacity and characteristics, which should be matched with the actual load. Different types of bearings have different load carrying capacity and characteristics, and should be selected to match the actual load.
For example, tapered roller bearings are suitable for large combined loads, while angular contact ball bearings are mainly used for axial loads.
The operating speed of the motor is another important consideration. Higher speeds place higher demands on the thermal stability and lubrication properties of the bearings.
Needle roller bearings and angular contact ball bearings usually have good high-speed performance and are suitable for high-speed motors. For low-speed large motors, more attention should be paid to the bearing capacity.
Motor in the actual application of the working environment environment on the bearing selection also has a significant impact.
If it is high temperature, dustproof, anti-corrosion and other harsh environments, it is necessary to use special materials or special design of bearings to ensure good adaptability. Sealed bearings provide protection against contaminants, while ceramic bearings offer excellent resistance to high temperatures.
The dimensions and internal layout of the motor must also be taken into account to avoid interference and constraints between the bearing selection and the motor.
Compact needle roller bearings and deep groove ball bearings offer certain advantages in this respect. At the same time, the assembly tolerances of the bearings have to be met to ensure that they can be fitted accurately.
Noise and vibration are important factors affecting motor performance and operating experience.
The design should fully consider the impact of bearings on motor vibration and operating noise, and targeted optimization. Generally, ball bearings are less noisy than roller bearings.
Finally, the ease of maintenance and replacement of bearings should also be taken into account. Removable outer or inner rings are designed to facilitate maintenance, and lubrication of the bearings should be taken into account to ensure the overall maintainability of the motor.
Application Of Electric Motor Bearings
a. Mechanical equipment: machine tool equipment, conveying equipment, fan equipment, etc.,
b. Automotive electronics: powertrain systems, braking systems, window lifting systems, etc.
c. Household appliances: washing machines, range hoods, refrigerators, etc.
d. Aerospace equipment
e. Transportation equipment: modern rail transportation, port cranes, logistics conveyor systems, etc.
f. Power equipment: wind power generation system, hydroelectric generator sets, etc.
g. Factory automation production lines and robotic systems;
Why Electric Motor Bearings Fail
- When bearings are operated under repeated load cycles, the material becomes progressively damaged and eventually leads to cracking. This damage usually occurs on the rolling elements or inner and outer rings of the bearing. The rate of fatigue damage depends on the magnitude of the load, the material properties of the bearing, and whether there is adequate lubrication. Over time, these small cracks can expand and eventually lead to bearing failure.
- Insufficient lubrication will aggravate the wear of the bearing, reduce its load carrying capacity; and excessive lubrication may cause leakage, heat and other problems. In addition, grease aging, pollution will also affect the lubrication effect, the lack of effective lubrication, bearings will soon lose the ability to work.
- Improper mounting of bearings will also have an impact on performance. If there is an error or deviation, it will cause the shaft bearing force is not uniform, too much preload and other problems, accelerate wear and tear or even damage.
- If there is serious vibration or shock load when the motor is running, it will also pose a great threat to the service life of the bearings. Vibration can lead to increased sliding wear inside the bearing, while shock loads can directly damage the rolling elements and inner and outer ring tracks.
- Motor working environment if there is dust, moisture, chemical media and other pollutants, once inside the bearing will cause erosion and pollution, quickly reduce its performance and promote failure.
- In addition, for some special-purpose motors, if the bearing temperature exceeds the design temperature range, will also cause various problems. High temperatures can cause oxidization and aging of the grease, softening and deformation of the metal material, etc., which can reduce the performance of the bearing until it fails completely.
How Bearing Size Affects Electric Motor Performance
Bearing size not only determines its load carrying capacity, but is also closely related to the maximum permissible speed of the motor. Choosing the right size of bearings is essential to maximize the performance of the motor.
First of all, bearing size determines its load capacity. Generally speaking, the larger the diameter and wider the width of the bearing, the stronger its load carrying capacity. Because the larger size can provide a larger radius of curvature of the rolling element raceway and more rolling element action area.
For example, a deep groove ball bearing with a diameter of 55mm has a basic static load rating of 13.9kN, while a diameter of 100mm is 44.3kN. Sufficient load capacity ensures that the bearing will not be overloaded when the motor is running, and avoids premature wear.
Secondly, for the same type of bearing, the larger the size, the lower the maximum permissible speed. This is because an increase in size leads to an increase in centrifugal force and non-linear vibration of the rolling elements, thus limiting the maximum speed. Take 623 type deep groove ball bearing as an example, when the size is 17×40×12mm, the limiting speed is 33000rpm, while the limiting speed decreases to 18000rpm when the size is increased to 40×90×23mm. moderate size is favorable for the bearing to meet the demand of high speed motor.
Therefore, in the motor design stage, it is especially important to choose a reasonable bearing size. On the one hand, it is necessary to provide sufficient load capacity for the bearings according to the actual load condition of the motor; on the other hand, it is also necessary to consider the working speed of the motor, and the size should not be too large to avoid affecting the high-speed performance.
Why Choose FHD's Electric Motor Bearings
As a fhd bearing company, we know that the performance and quality of the electric motor are very useful, and choosing us allows customers to enjoy the high quality and technical advantages of our products.
Our bearings are made of high-quality materials to ensure that they perform well under various working conditions; we use advanced manufacturing technology and strict quality control, as well as continuous R&D and innovation, customized production to meet the changing needs of the market and customers. At the same time, the use of high-performance materials and lubrication technology to reduce friction and wear, improve operational efficiency, but also to ensure the high reliability of the bearing.
FHD bearings is a trusted partner in the industrial industry, providing high quality bearings for all types of electric motors. If you need electric motor bearings, contact the experts at FHD bearings. Contact us today to learn more about our products and services.
References
- 1.View more detailed information about ”electric motor bearings“ from NTN
- 2. About “electric motor bearing “types and functions from ISK ;
