**Development of Magnetic Suspension NSK Bearings**
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*Created on 2018/5/16*
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With China's participation in the WTO and the advancement of scientific technology, economic globalization has accelerated. As a result, China has become a major international production center. However, there is still a significant gap between China and global leaders in advanced manufacturing. High-tech products from China remain relatively limited, and the arrival of the knowledge economy has further emphasized the need for innovation.
In this context, high-speed and high-precision rotor technologies are rapidly evolving across industries such as aviation, automotive, and oil. These rotors are moving toward higher speeds, greater precision, automation, and intelligence. Magnetic suspension bearings, as high-value-added mechatronic products, have been successfully applied abroad in areas like high-speed machine tool spindles and vacuum pumps, bringing substantial economic benefits.
Despite this, the use of magnetic suspension NSK bearings in industrial applications within China is still in its early stages. The theoretical foundation and practical methods for their application are still under development. With broad application potential and commercial value, magnetic suspension bearings represent a promising field for future technological growth.
Based on the working principle, magnetic suspension bearing systems can be classified into three main types:
1. **Active Magnetic Suspension Bearings**: Also known as automatic magnetic suspension bearings, these systems use electromagnetic force that can be controlled. A sensor detects the position of the rotor, and the control system adjusts it to maintain suspension.
2. **Passive Magnetic Suspension Bearings**: Also called forced magnetic suspension bearings, these rely on permanent magnets or superconductors to support the rotor with certain degrees of freedom.
3. **Hybrid Magnetic Suspension Bearings**: These combine electromagnets with permanent magnets or superconductors, allowing both components to work together in supporting the rotor.
Currently, research is more focused on active magnetic suspension NSK bearings, which are the primary subject of this paper. These bearings utilize the magnetic force between an electromagnet and ferromagnetic materials to achieve non-contact suspension of the rotor.
Magnetic suspension bearings offer numerous advantages, including reduced friction, lower wear, and improved efficiency. They are particularly suitable for high-speed and high-precision applications where traditional bearings may not perform well. As technology continues to advance, the adoption of magnetic suspension NSK bearings is expected to grow significantly in various industrial sectors.
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Development of Magnetic Suspension NSK Bearings
Source: Bearing Network | Time: 2013-03-04
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Manufacturing method
Using methyl naphthalene and sulfur trioxide as raw materials, the product was synthesized by sulfonation, condensation, neutralization and drying.
The degree of polymerization of water reducing agent is generally about 6-12, that is: n= 6-12, if the degree of polymerization is 1-3, it is used as a dispersant.
Concrete admixtures can be divided into four categories according to their main functions:
1. Admixtures to improve the variable performance of concrete mixing: including various water reducing agents, air entrainment agents and pumping agents.
2. Adjusting concrete setting time, hardening performance of admixtures: including retarding agent, early strength agent, accelerator and so on.
3. The admixtures to improve the durability of concrete include air entraining agent, water repellent agent, and rust inhibitor.
4. Other additives to improve the performance of concrete: including air entrainment agent, expansion agent, antifreeze agent, colorant, waterproofing agent and pumping agent.
According to the naming and definition of (GB8075-87) admixtures, admixtures can be divided into 16 names, which are respectively defined as follows:
1. Ordinary water reducing agent: an admixture that can reduce the amount of water used in mixing under the condition of the same slump of concrete;
2. Early strength agent: the admixture that accelerates the early strength development of concrete;
3. Retarding agent: admixture for extending the setting time of concrete;
4. Air entraining agent: an admixture which can introduce a large number of uniformly distributed, stable and closed micro bubbles in the mixing process of concrete;
5. High efficiency water reducing agent: admixture which can greatly reduce the water consumption of the mixture under the same conditions of concrete collapse;
6. Early strength water reducing agent: both early strength and water reducing function of water reducing agent;
7. Retarding and water reducing agent: a water reducing agent with both retarding and water reducing functions;
8. Air-entraining and water-reducing agent: admixture with air-entraining and water-reducing functions;
9. Waterproofing agent: can reduce the water permeability of co
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