Testing method for elastic modulus of air-conditioned compressor electric machine rotor

An air-conditioning compressor, elastic modulus technology, applied in the direction of measuring device, strength characteristics, material analysis by electromagnetic means, etc., can solve the problems of small overall deformation, sensor measurement of overall deformation, etc., to achieve the effect of solving test problems

Inactive Publication Date: 2004-08-18
SHANGHAI HITACHI ELECTRICAL APPLIANCES CO LTD
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the relatively high rigidity of the motor rotor, the effect of applying concentrated force is only to produce pits on the surface of the rotor, and its overall deformation is very small; and because the motor rotor is made of steel sheets, it is difficult to use strain gauges or pressure-sensitive Sensors such as resistance measure its overall deformation

Method used

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  • Testing method for elastic modulus of air-conditioned compressor electric machine rotor
  • Testing method for elastic modulus of air-conditioned compressor electric machine rotor
  • Testing method for elastic modulus of air-conditioned compressor electric machine rotor

Examples

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Embodiment Construction

[0029] Now, the present invention will be further described in conjunction with an embodiment and accompanying drawings.

[0030] ●Firstly, connect the B&K4374 acceleration sensor with the B&K2635 charge amplifier as required by wires, and connect the charge amplifier with the CF-350 spectrum analyzer; install the B&K8200 force sensor on the hammer, and use the wires to connect the force sensor with another B&K2635 The charge amplifier is connected, and then the charge amplifier is connected with the CF-350 spectrum analyzer, such as figure 1 shown.

[0031] The force sensor (B&K8200) and the acceleration sensor (B&K4374) are sensors made of the piezoelectric effect of the crystal, and the output charge is proportional to the force or acceleration on the test piece; the output voltage of the charge amplifier (B&K2635) It is proportional to the amount of input charge; the spectrum analyzer (CF-350) is a dual-channel spectrum analyzer, which performs signal processing such as t...

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Abstract

The invention relates to a testing method for air-conditioner compressor motor rotor elastic modulus comprising the steps of, first, obtaining a voltage signal in direct proportion with acceleration by hammering test, computing vibration inherent frequency of each level of the system, later computing vibration inherent frequency of each level of the test piece by finite element computation analysis software, comparing with the result of the hammering test, converting the modulus of elasticity estimated value of the test piece model, recalculating the modulus of elasticity estimated value of the test piece model, which as the modulus of elasticity of the tested parts. The invention can be applied to solve the problem of measuring the motor rotor elastic modulus.

Description

Technical field [0001] The invention relates to a method for testing the elastic modulus of an object, in particular to a method that combines testing and calculation to solve the problem of testing the elastic modulus parameters of an air-conditioning compressor motor rotor. Background technique [0002] The motor rotor is one of the main parts of the air-conditioning compressor. When designing the structure of the compressor, it is necessary to know the elastic modulus of the motor rotor and other parts. The elastic modulus of a material can generally be obtained by looking up a table. However, since the motor rotor is a composite part of steel sheet and aluminum, it needs to be obtained through experimental measurement. The traditional method of measuring the elastic modulus of a mechanical part is to first apply a concentrated force on the part, measure its deformation, and then calculate its elastic modulus. However, due to the relatively high rigidity of the motor ro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/00G01N27/00
Inventor 苏志军江陵宋国航贺懿
Owner SHANGHAI HITACHI ELECTRICAL APPLIANCES CO LTD
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