Standard magnetic suspension hybrid bearing-supported rotor and high-speed induction electrical rotating machine

Abstract

The invention discloses a standard magnetic suspension hybrid bearing-supported rotor for a high-speed induction electrical rotating machine, which comprises a standard magnetic suspension supportingsystem with permanent magnetic suspension and a rolling bearing for auxiliary support, a rotor core winding and a rotating shaft, wherein in the standard magnetic suspension supporting system, a permanent magnetic radial bearing adopts a plurality of parallel groups of axially magnetized inner and outer magnetic rings and an angular contact ball bearing is used for providing radial auxiliary support and withstands an axial push thrust with a thrust bearing; a rotor core lamination adopts a circular closed slot and a core winding adopts cold riveting joint; the inner magnetic rings are providedwith magnetic insulation inner sleeves and outer layer protective sleeves and cooling air ducts are preserved between the outer magnetic rings. The standard magnetic suspension hybrid bearing-supported rotor and the high-speed induction electrical rotating machine of the invention ensure that the peripheral velocity of the rotor is stably up to over 200m / s and the effect is remarkable.

Description

technical field [0001] The present invention relates to a quasi-magnetic suspension hybrid bearing-supported rotor for high-speed induction electric rotating machines, in particular to rotors for large-capacity air refrigerators, air compressors, etc. driven by high-speed induction motors, wherein the rotor is for example not High-speed rotation of less than tens of thousands of revolutions per minute. The invention also relates to other high speed induction electric rotating machines including the rotor. Background technique [0002] There are two main technical problems to be solved in the design of high-power, high-speed high-speed induction motors (20kw, above 60000 / min): one is the bearing design; the other is to prevent the rotor from being deformed and damaged when the motor rotates at high speed. At present, the bearing design of this kind of high-power, high-speed motor generally considers the active magnetic bearing support method of hybrid support of electromagne...

AI Technical Summary

Problems solved by technology

It is understood that the foreign copper cage manufacturing process uses vacuum melting and welding copper powder to form copper strips, which is similar to the powder metallurgy high-temperature sintering process, which can ensure the fit between the copper strips and the iron core channel, but the process is complicated and the cost is too high And the technology is not mature

[0005] Another process is that the end ring and the guide bar of the copper cage rotor core winding are connected by welding, but this leads to the softening of the material at the end ring and the end of the guide bar after welding, which cannot resist the ultra-high-speed rotation of the material Generally, a protective sleeve should be added to the end ring, but this will cause the heat dissipation condition of the end ring to deteriorate.

Images