Energy losses reductuion in high speed hybrid spindle bearings

Comparison of Bearings --- For the Bearing Choosing of High-speed Spindle Design

There are many types of bearings available, each used for different purposes and different conditions. Two major types of bearings are contact bearings and noncontact bearings. By considering the ball material, I separate the contact bearings to steel bearings and ceramic ball bearings. On the other hand, there are bearings that can run without any contact between the sliding surfaces in the be...

Study of Micro-High Speed Bearings and

Micromachine gas turbines require extremely high rotor speed to realize the same impeller tip speed to the large gas turbines, by very small diameter of the impellers. Hence, the rotordynamics is one of the critical issues. Especially, the bearing speed will exceed the range of experience in any existing turbomachines, and hence the method to achieve the stable operation at the required design ...

Thermal Model of High-Speed Spindle Units

For the purpose to facilitate development of high-speed Spindle Units (SUs) running on rolling bearings, we have developed a beam element model, algorithms, and software for computer analysis of thermal characteristics of SUs. The thermal model incorporates a model of heat generation in rolling bearings, a model of heat transfer from bearings, and models for estimation of temperature and temper...

High Speed Rotors on Gas Bearings: Design and Experimental Characterization

High-speed Electrical Motor/generator Supported by Air Bearings

This paper reports on the development of a high-speed electrical machine which can be used as motor or generator for application in micro heat engines. The machine has a rated power of 200 W at a rotational speed of 600 000 rpm and is supported by self-acting air bearings. The design process outlined in the paper focuses on aspects such as electromagnetic design, bearing design, rotordynamic be...