Magnetic suspension bearing stator, magnetic suspension bearing, motor, compressor and air conditioner

Abstract

The invention discloses a magnetic suspension bearing stator, a magnetic suspension bearing, a motor, a compressor and an air conditioner, and relate to the field of air conditioners. The magnetic suspension bearing stator comprises a shell and a stator assembly, wherein the shell is provided with a mounting cavity, the stator assembly comprises a connecting ring, the outer circumferential wall ofthe connecting ring is in interference fit with the circumferential wall of the mounting cavity, a first positioning bulge and a first positioning groove are arranged between the connecting ring andthe shell, the first positioning bulge is embedded in the first positioning groove, in the circumferential direction of the connecting ring, the first positioning bulge is abutted against the groove wall of the first positioning groove, the first positioning bulge is arranged on the outer circumferential wall of the connecting ring, and the first positioning groove is formed in the circumferentialwall of the mounting cavity. The assembling difficulty of the stator assembly and the shell is low, and the mounting precision is high; the matching reliability between the connecting ring and the shell is high, even if the magnetic suspension bearing stator operates under a high-temperature working condition, the stator assembly can not shake relative to the shell in the circumferential direction, so that looseness of the stator assembly relative to the shell is avoided, and the system rigidity of the magnetic suspension bearing stator is improved.

Description

technical field [0001] The invention relates to the field of air conditioning, in particular to a magnetic suspension bearing stator, a magnetic suspension bearing, a motor, a compressor and an air conditioner. Background technique [0002] Magnetic suspension bearings use magnetic force to suspend the rotor in the air, so that there is no mechanical contact between the rotor and the stator. A conventional magnetic suspension bearing stator includes: a stator winding, a stator core, a connecting ring and a casing. [0003] Among them, the stator winding is enameled wire, which mainly provides electromagnetic force for the magnetic suspension bearing. The stator core is made of magnetic silicon steel sheet material, which is mainly used for the placement of the stator winding and the conduction of the magnetic circuit. Together with the magnetic suspension bearing rotor and air gap, it forms a complete electromagnetic circuit. The connecting ring is a magnetically conductiv...

AI Technical Summary

Problems solved by technology

[0005] 1. Since the shell is made of aluminum alloy and the connecting ring is made of steel, the hardness of the shell material is lower than that of the connecting ring, which will cause irreversible plastic deformation of the shell during shrink-fit assembly, resulting in an interference fit that cannot meet the requirements

In particular, the shell and the connecting ring may not meet the requirements after installation, and a second disassembly and assembly is required. After the shell and the connecting ring are disassembled and assembled many times, the shell is seriously deformed, which affects the coaxial accuracy of the magnetic levitation assembly and is not conducive to the suspension of the rotor. control, and may even cause the entire magnetic bearing assembly to be scrapped and unusable, which will bring great loss and inconvenience to product maintenance

[0006] 2. After the plastic deformation of the shell, the actual interference cannot meet the requirements. During the operation, the magnetic suspension bearing needs to adjust the electromagnetic force of the stator winding in real time according to the feedback of the rotor position signal, so as to realize the rotor in the Fixed position frictionless high speed rotation

Due to the constant change of the electromagnetic force, the stator core and the connecting ring are subjected to the reaction force of the electromagnetic force, and small displacement vibrations of different frequencies will be made in the housing. At the resonant frequency and critical speed, the vibration displacement shows an exponential growth. After running for a long time, the connecting ring, stator core and shell will be loose, the magnetic suspension bearing cannot be used, and the reliability is not high

[0007] 3. During the operation of the magnetic suspension bearing, it is necessary to continuously adjust the magnitude of the electromagnetic force to form an alternating magnetic field, which will cause the stator winding, stator core and connecting ring to generate heat, which will increase the temperature of the entire magnetic suspension bearing.

As a result, the interference between the connecting ring and the housing becomes smaller, and under the joint action of plastic deformation and small displacement high-frequency vibration, the magnetic suspension radially causes the connecting ring, stator core and housing to loosen, and the magnetic suspension bearing cannot be used. , the reliability is not high

[0008] In order to improve the reliability of the connection between the connecting ring and the housing, the usual practice in the prior art is to increase the interference between the housing and the connecting ring. For example, the patent application with the publication number CN109058295A sets protrusions on the inner peripheral wall of the housing. part, in order to increase the interference between the connecting ring and the shell, but this will increase the difficulty of installing the shell and the connecting ring on the one hand, and on the other hand, it will also increase the difficulty of disassembling the shell and the connecting ring. Large, if there is a quality problem in the fit between the shell and the connecting ring (for example, the coaxial precision cannot meet the requirements), it is difficult to disassemble the fit between the shell and the connecting ring, which will easily lead to the scrapping of the fit between the shell and the connecting ring

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