New Ceramic Ball Bearing for Motors (EXSEV)
EXSEV / JTEKT Corporation (Official website) / Listed on page 1 of the document
An insulating ceramic ball bearing for preventing electrical erosion in electric motors. Its coefficient of linear expansion is close to that of bearing steel, allowing use across a wide range of temperature environments.
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Specifications
| Density | 6 g/cm3 |
|---|---|
| Coefficient of linear expansion | 10.5×10-6 1/℃ |
| Vickers hardness | 1280 HV |
| Modulus of elasticity | 210 GPa |
| Poisson's ratio | 0.31 |
| 3-Point Bending Strength | 1200 MPa |
| Fracture toughness | 5～6 MPa·m1/2 |
| Conductivity | Insulator |
| Contact stress (test conditions) | 4.2 GPa |
| Crushing load (3/8 inch ball) | 29.9 kN |
How to choose Rolling Bearings
Points to check when selecting, with the values for this product (New Ceramic Ball Bearing for Motors (EXSEV)).
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1. Main dimensions matching shaft diameter and housing
The bore diameter d is determined by the shaft diameter, while the outside diameter D and width B are determined by the housing bore diameter and mounting space. Main dimensions are standardized under JIS/ISO series, which makes replacement with interchangeable products easier. For tapered roller bearings, also check the assembled width T and outer ring width C; for thrust bearings, also check the height H.
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2. Check dynamic load rating against required life
The basic dynamic load rating Cr is the reference value for calculating rolling fatigue life during rotation. Calculate the rated life from the actual applied load and rotational speed, and confirm that the required life is met. Roller bearings have a larger Cr than ball bearings of the same dimensions and are suited to heavy loads.
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3. Check static load rating for stationary or shock loads
In applications involving low-speed rotation, oscillation, or shock loads while stopped, permanent deformation (indentations) may remain on the raceway surfaces. Therefore, check the safety factor using the ratio of the basic static load rating C0r to the maximum load.
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4. Combination of rotational speed and lubrication method
The limiting speed differs between grease lubrication and oil lubrication. Confirm that the operating speed has sufficient margin using the value for the lubrication method adopted. At higher speeds, the cage material, guide method, and accuracy grade also affect rotational performance.
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5. Handling load direction and shaft misalignment
If axial loads (loads in the shaft direction) are also applied, check the contact angle of angular contact ball bearings or tapered roller bearings. The larger the contact angle, the greater the capacity to accept axial loads. If the shaft deflects or there are mounting errors, check the permissible misalignment angle of self-aligning types.
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6. Materials for high-temperature, vacuum, and corrosive environments
In high-temperature, vacuum, or chemical-exposed environments, common combinations of steel and grease may not be usable. Therefore, confirm the operating temperature range and atmospheric pressure, then select the rolling element material and cage material accordingly. Options include ceramics, stainless steel, solid lubricants, and fluorine grease.
This guide was written by AI based on the listed products' documents and specification items.
Description
A ball bearing using a new ceramic material for the rolling elements. It offers insulation and strength equivalent to conventional ceramics (silicon nitride), and its coefficient of linear expansion is closer to that of bearing steel than conventional ceramics, so changes in internal clearance due to temperature variation are small. After a 3600-hour high-temperature test, there is no significant deterioration in acoustic values, and rolling fatigue life evaluation results show a calculated life of more than three times the design life.
Features
- Insulation effective for preventing electrical erosion
- Coefficient of linear expansion close to that of bearing steel
- Strength equivalent to conventional ceramics
- No significant deterioration in acoustic values after 3600 hours
Applications
- Inverter motors
- Fan motors
FAQ
- Q. Can the New Ceramic Ball Bearing for Motors (EXSEV) be used to prevent electrical erosion?
- A. It is a ball bearing using a new ceramic material for the rolling elements and has insulating properties. Its insulation is effective for preventing electrical erosion.
- Q. How does the coefficient of linear expansion of the EXSEV series compare with that of bearing steel?
- A. Its coefficient of linear expansion is close to that of bearing steel, so changes in internal clearance due to temperature variation are small. The coefficient of linear expansion is 10.5×10-6 1/°C.
- Q. What are the strength and material properties of the EXSEV series?
- A. It offers insulation and strength equivalent to conventional ceramics (silicon nitride). Density is 6 g/cm3, Vickers hardness is 1280 HV, Young's modulus is 210 GPa, Poisson's ratio is 0.31, three-point bending strength is 1200 MPa, fracture toughness is 5 to 6 MPa·m1/2, and electrical conductivity is insulating.
- Q. Does the EXSEV series maintain its performance during long-term use at high temperatures?
- A. No significant deterioration in acoustic values occurs after a 3600-hour high-temperature test. Rolling fatigue life evaluation results also show a calculated life of more than three times the design life.
- Q. What applications is the New Ceramic Ball Bearing for Motors (EXSEV) suited for?
- A. It is used in inverter motors and fan motors.
Written by AI based on the content of the source documents.
Source documents
- Catalog モータ用 新セラミック玉軸受 Open page 1
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