Self-generating Magnetic Bearings

Abstract

The invention discloses a self-powered type magnetic bearing and relates to a bearing. The self-powered type magnetic bearing comprises a bearing body, wherein a plurality of iron cores are arranged inside the bearing body; the iron cores are wound with electromagnetic coils; a power generation device is arranged outside the bearing body and connected with the electromagnetic coils; the power generation device comprises a stator which is required to be arranged on a main shaft in a sleeving mode; stator windings are arranged on the stator uniformly; permanent magnets matched with the stator windings are arranged on the main shaft; electromagnetic coils arranged on the same iron core are divided into a coil of group A and a coil of group B; the coil of group A and the coil of group B are connected with the power generation device respectively; and the turns as well as the current directions of the coil of group A and the coil of group B are the same. Compared with the prior art, the magnetic bearing gains power through the rotation of the shaft to supply power for the coils, as a result, a magnetic levitation effect of the magnetic bearing and the shaft is achieved. When the shaft works, the magnetic bearing also works all the time, so that the problems that a previous magnetic bearing and the shaft belong to two power supply systems respectively, and once electricity of the magnetic bearing is cut off, the shaft rotating at a high speed is damaged and the fracture also cause damage to a motor are avoided.

Description

technical field [0001] The invention relates to a bearing, especially a magnetic bearing. Background technique [0002] Magnetic bearing is a new type of high performance bearing. Compared with traditional ball bearings, sliding bearings and oil film bearings, magnetic bearings have no mechanical contact, and the rotor can reach high operating speeds. It has small mechanical wear, low energy consumption, low noise, long life, no lubrication, and no oil pollution. And other advantages, especially suitable for high-speed, vacuum, ultra-clean and other special environments. It can be widely used in machining, turbomachinery, aerospace, vacuum technology, identification and testing of rotor dynamic characteristics, etc., and is recognized as a promising new type of bearing. Magnetic bearings can be divided into the following three categories according to the way the magnetic force is provided: active magnetic bearings, also known as active magnetic bearings, the magnetic field...

AI Technical Summary

Problems solved by technology

However, self-generating magnetic bearings need to be powered. Once the power supply is interrupted, the magnetism will disappear. At this time, the high-speed rotating shaft cannot be suspended in the magnetic bearing, and the friction will increase instantly. This is very easy to cause damage to the shaft, and even worse. Let the shaft break or let the motor be scrapped directly

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