Generator Bearing
JTEKT Corporation (Official website) / Listed on page 3 of the document
Insulated ceramic bearing that prevents electrical erosion inside the generator of wind turbines. Also contributes to longer service life.
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Specifications
| Heat resistance | 800 ℃ |
|---|---|
| Density | 3.2 g/cm3 |
| Vickers hardness | 1300 to 2000 Hv |
| Modulus of elasticity | 310 GPa |
| Magnetism | Non-magnetic material |
| Electrical conductivity | Insulator |
How to choose Rolling Bearings
Points to check when selecting, with the values for this product (Generator Bearing).
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1. Bore and housing bore dimensions
Select the bore diameter d to match the shaft seat, the outside diameter D to match the housing bore, and the width B to suit the installation space. Main dimensions are standardized in ISO and JIS dimension series, so interchangeable products can be found by boundary dimension designation. For tapered roller bearings, also check the assembled width T; for thrust bearings, also check the height H.
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2. Dynamic load rating based on life calculation
The basic dynamic load rating Cr is the reference value for calculating rated life. Verify that the required life is met using the equivalent load during operation and the rotational speed. For ball bearings, life is proportional to the cube of the load ratio, so providing load margin greatly extends life.
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3. Margin for static and shock loads
The basic static load rating C0r is the allowable standard for permanent deformation generated at the rolling elements and raceways under stationary or low-speed conditions. For applications with oscillating motion or shock loads, confirm that a static safety factor against the maximum load is secured using C0r.
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4. Operating speed and lubrication method
The limiting speed differs by lubrication method, and separate values are given for grease lubrication and oil lubrication. Confirm that the normal operating speed does not exceed the limiting value, and in high-speed ranges also consider cage material and precision grade. The reference speed can also be consulted as a thermal guideline.
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5. Precision grade and internal clearance
Precision grades (P0, P6, P5, etc.) indicate rotational accuracy and dimensional accuracy; for high-precision applications such as machine tool spindles, select higher grades. Internal clearance (C2, CN, C3, etc.) is selected to allow for changes caused by interference fit and temperature differences during operation.
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6. Materials and lubrication suited to the environment
For corrosive, high-temperature, vacuum, or clean environments, select specifications such as rings and rolling elements made of stainless steel or ceramics, or solid lubricants and fluorine grease for vacuum use. Check the operating temperature range, low dust generation, and whether food-grade grease registration applies against the application conditions.
This guide was written by AI based on the listed products' documents and specification items.
Description
An insulated ceramic bearing using silicon nitride-based ceramic rolling elements to prevent localized melting (electrical erosion) caused by current passing through the bearing interior. Compared with insulation coatings on the outer ring outer diameter or insulated bearing housings, it offers easier handling during installation and long-term insulation performance. The ceramic balls also lower bearing operating temperature and extend grease life.
Features
- Silicon nitride-based ceramic used for rolling elements
- Longer service life through prevention of electrical erosion
- Reduced maintenance costs
Applications
- Generators for wind turbines
FAQ
- Q. What material is used for the rolling elements of the generator bearing?
- A. Silicon nitride-based ceramic is used for the rolling elements.
- Q. What failure does the generator bearing prevent?
- A. It is an insulated ceramic bearing that prevents localized melting (electrical erosion) caused by current passing through the bearing interior. By preventing electrical erosion, it contributes to longer service life and also helps reduce maintenance costs.
- Q. Where can the generator bearing be used in wind turbines?
- A. It is used in the generator of wind turbines.
- Q. What are the electrical and magnetic characteristics of the generator bearing?
- A. It is electrically insulating and non-magnetic.
- Q. What are the heat resistance and mechanical properties of the generator bearing?
- A. Heat resistance is 800 ℃, density is 3.2 g/cm3, Vickers hardness is 1300 to 2000 Hv, and Young's modulus is 310 GPa.
Written by AI based on the content of the source documents.
Source documents
- Catalog 風力発電装置用製品 Open page 3
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