Permanent magnet and rolling-sliding bearing type motor rotor bearing and rotary machine with same

Abstract

The invention relates to a rotor bearing used in a high-speed electric rotary machine. In the rotor bearing, a pair of angular contact ball bearings is nested at the two ends of a radial sliding bearing on the shaft neck of the two ends of a rotor, constant pressure pre-compression is adopted between the two ball bearings, the whole is embedded in a floating bushing; the outside end of the floating bushing is provided with a check ring and a check block for limiting the axial movement and rotation of the floating bushing, ensuring that the whole is in a semifloating state when installed in a bearing seat hole with a certain fit clearance and constructing a semifloating type rolling-sliding bearing. The two ends of the rotor are separately provided with a permanent magnet unloading bearing. When a high-power high-speed electric rotary machine using the rotor bearing of the invention is installed on a vehicle and operates in the rotate speed of more than 60000r / min, the operation of the system can be stable and reliable owning to the combined action of the semifloating rolling-sliding bearing and the permanent magnet unloading bearings.

Description

technical field [0001] The present invention relates to a rotor support for high-speed electric rotating machinery, in particular to a rotor support 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 limited t...

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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