Application of Magnetic Bearing on High Speed ​​Spindle of Machine Tool

Magnetic bearings used in high-speed spindle can get 100000rpm speed, on the one hand can improve the surface processing effect, on the other hand, its service life is much larger than the traditional bearings. Although this technology is still in the prototype test phase, many advantages have been fully demonstrated. Its performance is not affected by thermal effects, there is no wear and tear, in the case of overload can be automatically shut down. Conventional bearings provide radial or axial support for the spindle, allowing relative movement between the inner and outer rings. The inner ring and the outer ring are connected by balls or rollers, and the supporting force is also transmitted between the three. Film bearings without balls or rollers, it uses pressure oil for lubrication or heat dissipation. These two bearings have been hundreds of years of history. Magnetic bearings on the rotating parts of the support is different from the above two products. Magnetic bearing is a non-contact bearing, which through the electromagnetic force so that the rotating parts suspended between the fixed parts. This means that there is no friction, no wear, and higher stability, and can achieve higher speeds. The electromagnetic force is mainly related to the current and the size of the gas gap. The sensor collects the data of the gap size. The control system adjusts the current output according to the input signal. Magnetic bearings are mainly composed of three parts: Bearings and sensors: Bearings to provide support for the spindle, the sensor is responsible for collecting the position signal. Control system: responsible for providing electricity, and based on the feedback signal to calculate the correct corrective force to drive different directions of the controller. System: Responsible for calculating and outputting the feedback signal. The main disadvantage of magnetic bearings is: bulky, requires power, as well as complex structures and algorithms.

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