Rotor supporting structure of high speed electric rotary machine and rotary machine

Abstract

The invention discloses a rotor supporting structure of a high speed electric rotary machine. Two end parts of radical sliding bearings at journals of two ends of a rotor are sheathed with a pair of angular contact ball bearings, constant-pressure prestressing is adopted between the two ball bearings, the two balling bearings are embedded in a floating bush, and the outer side end of the floating bush is provided with a check ring and a stop dog to limit the floating bush from moving and rotating along the axial direction and enable the floating bush to be loaded in a bearing seat hole with a certain fit clearance to be in a semi-floating state, thus forming a semi-floating rolling-sliding double bearing. When the high power high speed electric rotary machine adopting the rotor supporting structure of the invention is arranged in a vehicle which runs high speed of above 60000r / min, due to the action of the semi-floating rolling-sliding double bearing, the system can be stably and reliably operated.

Description

technical field [0001] The present invention relates to a rotor support structure for high-speed electric rotating machines, in particular to rotor supports for air refrigerators, air compressors, etc. driven by large-capacity high-speed electric motors installed on vehicles, etc. Wherein the rotor rotates at a high speed of, for example, not less than tens of thousands of revolutions per minute. Background technique [0002] One of the main technical issues in the design of high-power, high-speed high-speed motors (20kw, above 60000 / min) is bearing design. At present, for the bearing design of this kind of high-power, high-speed motor, it is generally considered to adopt the active magnetic bearing support method of the mixed support of electromagnetic bearing and rolling bearing, but the electronic control and manufacture of this magnetic bearing are complicated, expensive and reliable. low, and cannot be commercialized at present; the use of liquid sliding bearings is li...

AI Technical Summary

Problems solved by technology

At present, for the bearing design of this kind of high-power, high-speed motor, it is generally considered to adopt the active magnetic bearing support method of the mixed support of electromagnetic bearing and rolling bearing, but the electronic control and manufacture of this magnetic bearing are complicated, expensive and reliable. low, and cannot be commercialized at present; the use of liquid sliding bearings is limited to a certain extent due to the large friction loss when the motor rotates at high speed and the small bearing capacity of air sliding bearings; composite ceramic ball angular contact ball bearings are used as this large Power and high speed motor bearings have not been reported in China at present

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