Magnetic bearing high speed motor with air bearing assist

Abstract

The invention discloses an air bearing-assisted magnetic suspension bearing high speed motor. A shaft cover, a first air bearing, a motor housing, a second air bearing, and a rear end cover are sequentially fixedly arranged to form a stator. A rotor and an air bearing shaft hole are in a clearance fit. The inner side wall of the shaft cover is provided with a first conical surface annular-shaped magnet. Two ends of the motor shaft are respectively fixedly provided with a second conical surface annular-shaped magnet and a third conical surface annular-shaped magnet. The inner side wall of the rear end cover is fixedly provided with a fourth conical surface annular-shaped magnet. The first conical surface annular-shaped magnet and the second conical surface annular-shaped magnet are paired, and like poles repel. The other two magnets are also paired, and like poles repel. The air bearing-assisted magnetic suspension bearing high speed motor is advantageous in that by combining the advantages of the air bearing and the advantages of the permanent magnet suspension bearing, a great amount of compressed air can be saved, and the motor operation efficiency can be improved by half.

Description

technical field [0001] The invention relates to a motor, in particular to a high-speed motor with an air bearing auxiliary magnetic suspension bearing. Background technique [0002] The high-speed spindles currently used in machine tools (mainly in light-load and high-speed occasions, with a working speed of 100,000-350,000 rpm, such as PCB drilling machines, etc.) use high-speed motors supported by compressed air bearings. Motors are now widely used and the technology is mature, but this kind of motor needs to consume a lot of compressed air (generally a 1KW motor needs to be equipped with a power of about 1KW air compressor), the work efficiency is not high and the maintenance is cumbersome, and some small mechanical bearings are used, but The speed is generally below 80,000 rpm, and the power of the motor needs to be increased, so the efficiency is not high. Contents of the invention [0003] In order to overcome the energy consumption and maintenance problems caused b...

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Problems solved by technology

[0003] In order to overcome the energy consumption and maintenance problems caused by the need for a large amount of compressed air in the current spindle motor supported by compressed air bearings, the present invention combines the advantages of air bearings and permanent magnetic suspension bearings, and only needs to be turned on a few seconds before the motor starts. After the motor reaches the rated speed, the compressed air can be cut off, and only rely on the permanent magnetic suspension bearing to support the operation, so that more than 95% of the compressed air can be saved, and the overall energy saving is about 45%.

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