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基于三座标测量机的串激电机机壳精度的检测

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Jun.2013机 床 与 液 压Hydromechatronics Engineering Vo1. 41 No.12DOI:10.3969/j.issn.1001-3881.2013.12.023Precision M easurement of Series Motor HousingBased on CM MJIN Chuan ,LI YingNanjing Institute ofIndustry Technology,Nanjing 210023,China1.IntroductionAbstract:The smal series motor is generaly used in power tools as power source,and the coax。

iaI时 of stator and the rotor is the most important index of the assembly qualit,/and working life ofmotor-However this index is directly based on the motor housing assembly datum accuracy Inorder tomprove the accuracy,appropriate measurement is very improtant. This paper developedthree diferent measurement methods for motor housing assembly datum coaxiality based onCMM made by German Zeiss company which is equipped with Calypso software, then finalized amOre eficient and accurate measurement method. which wil improve motor housing precisionand working life of motor。

Key words:CMM,Motor Housing,Precision MeasurementW ith the developmentand electrical products tendportable and low cost at themotor。

of society, mechanicalto be smaller size,moresame time.So does theCurrently for small size motor. the motor hous。

ing is injected directly with plastic,especialy for DCseries motor.The material of injection is usually thenylon in which some glass fiber is added. Therefore,the cost of manufacturing will be comparatively de。

creased and manufacturing efficiency will be greatlyimproved.Another benefit of this is that the Dortabili。

ty will be enhanced due to the using of less weightplastic materia1。

However,the disadvantages are quiet obvious:Due to the deformation.the distance between locati0nof stator and rotor on motor housing and the Iocationof assembling with other part of motor housing will in-evitably deviate from the original design.However,Received:2013-03-01JIN Chuan.E·mail:jincl###nit.edu.cnthe parts inside motor have high precision require-ments from the design point of view.Any interferencebetween parts wil lcad to anomalous temperature riseeven burn up for the range of rotation speed from10,000 r/min to 20,000 r/min。

Therefore,it is very important to control the pre-cision of motor housing。

In order to control the precision of motor housing,the key part is how to measure and assess it. Curently,CMM is widely used as measurement too1. The process of measurement is that detector gets somepoints data on workpiece,and then inputs to softwareto simulate the expected results。

The advantage for this measurement is no needto rotate workpiece,no need to prepare a dedicatedshaft or support,no need to do mechanical align。

ment,and the eficiency is very high with good re。

peatability[1].However,the disadvantages for thismethod are the measurement datum selection, it isthe one of most important factors which will affect themeasurement precision[2]。

This paper tries to take one power tool motorhousing as example to analyze and find out how tochoose an appropriate and reliable datum system forbetter precision measurement of motor housing。

Hydromechatronics Engineeringconnecting point O1 and point 02,and same way tocreate line O2O3。

Same as method 1,we could evaluate the coaxi-ality of line O1 O2 and line O3 O4 to reflect the coaxial-ity of stator and rotor。

Fig.4 Take measurement datum from assembledfix plate and stator3.3.M ethod 3,Taking measurement datum withBest Fit”functionSame as method 2,tor housing to get pointssame process as before。

assemble stator into the no-O1,O3and O4 following theNext we will use the Best Fit” function ofCMM to create 02.Firstly,we need take points fromthe whole four assembly holes,and then the programwil apply these hole position data with the method ofleast squares to get the closest center point 02 asshown in Fig.5。

So we can get line O1O2 and line O3O4 to meas-ure the coxaility。

r l1Fig.5 Measure with best fit function4.Measurement results comparison andanalysisTab.1 Measurement results of coaxiality mm123450.659 991 9 0.662 514 5 0.423 575 90.834 l06 9 0.486 235 6 0.456 258 90.393 049 9 0.542 658 9 0.44125840.452 631 5 0.425 962 3 0.492 562 l0.885 610 4 0.632 156 4 0.425 469 8The above difference could be explained as fo1。

1OWS:For the Method 1.we take points directly on thesurfaces of motor housing ribs,but motor housing isinjected out of mold,the ribs has draft angle for easi-er release from mold,that means the detector will getdifferent data with different section:On the otherhand,since the ribs are very thin,they are easy tobe deformed during the process out of mold.So it ishard to get the reliable and repeatable results by suchkind of point data.The similar situation for the as-sembly surfaces as the area is too smal1。

vantages of Methodl,but assembly process will leadto the deformation of the motor housing,especiallyfor the fix plate.Because the open end of the motorhousing normally has more deformation after it comesout of the mold,and the flatness of the open end sur。

face becomes worse,if the fix plate is assembled onin this situation.the deviation occurs。

ges for the both methods as mentioned above,so itcould get better results。

5.ConclusionsTh e precision of motor housing will directly af-feet the motor precision and life.It needs to be meas-ured with reliable and repeatable method to controlthe precision.According to the measurement results,the control of manufacturing process will help to im-prove the motor precision and lifespan。

Following the 3 methods,the measurement re- [1]suhs are shown in Tab.1。

From the measurement results,we can see thatMethod 1 has the greatest measurement deviation andpoor repeatability,Method 2 is beter and Method 3is the best one。

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LIUZhaoping.App lication of CoaxiMity Measurement onCMM lJ].PRECISE MANUFACTURING&AUT0MA-TION,2010(3):61-63.(Continued from 134 page)134 Hydromechatronics Engineering[3][4]ELECTRIC MACHINES AND CONTROL,2010,14(7):66-74。

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基于智能融合策略的双轴交叉耦合同步运动伺服控制熊宪生重庆腾升建筑工程有限公司 智能化部,重庆 404000摘要:为提高工业 CT射线源-探测器双轴位置伺服同步运动的定位精度、跟踪精度与同步精度等性能,提出了-种基于智能融合的交叉耦合同步运动控制策略。分析了控制品质的影响因素,建立了运动控制的数学模型,研究了相关控制策略 ,针对不确定性难题提 出了基于智能融合的同步运动策略。以双轴系统结构同步控制为例,基于 Matlab/Simulink环境进行 了仿真的对比实验研究。系统响应曲线表明:提出的控制策略具有较强的位置指令跟踪、同步与抗干扰性能。实验结果证实所提出的智能融合控制策略是合理、可行的,控制跟踪精度较高。

关键词:工业CT;同步运动;交叉耦合;位置伺服;智能融合控制中图分类号:TP273(Continued on 112 page)基于三座标测量机的串激电机机壳精度的检测金 川 ,李 颖南京工业职业技术学院,南京 210023摘要:普通电动工具-般采用小型 串激电机作为动力源,其定、转子轴心线的同轴度是考量电机装配质量和电机寿命的最重要的指标,而这个指标直接撒于电机机壳的装配定位精度。为了控制电机机壳的精度,需要合适的测量手段来对电机机壳内部的定位基准进行检测。应用配备 Calypso软件的德国蔡司(Zeiss)公司的三坐标测量机 ,制定了3种基于不同基准的测量方案对电机机壳 内部的装配定位基准进行同轴度测量。通过对测量结果的比较,确定了-种较为高效、准确的测量方法,为控制电机机壳的精度、提高电机使用寿命提供了有效的手段。

关键词:三坐标测量机;电动机机壳;精度检测中图分类号:TH161

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