CN101303261A - Method for measuring non-contact type bearing startup friction torque and measuring instrument thereof - Google Patents

Method for measuring non-contact type bearing startup friction torque and measuring instrument thereof Download PDF

Info

Publication number
CN101303261A
CN101303261A CNA2007100543864A CN200710054386A CN101303261A CN 101303261 A CN101303261 A CN 101303261A CN A2007100543864 A CNA2007100543864 A CN A2007100543864A CN 200710054386 A CN200710054386 A CN 200710054386A CN 101303261 A CN101303261 A CN 101303261A
Authority
CN
China
Prior art keywords
bearing
torquer
control
driving
disc
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CNA2007100543864A
Other languages
Chinese (zh)
Other versions
CN101303261B (en
Inventor
高奋武
李国斌
王宗克
刘金秀
廖家祥
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Luoyang Bearing Science and Technology Co Ltd
Original Assignee
Luoyang Bearing Science and Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Luoyang Bearing Science and Technology Co Ltd filed Critical Luoyang Bearing Science and Technology Co Ltd
Priority to CN2007100543864A priority Critical patent/CN101303261B/en
Publication of CN101303261A publication Critical patent/CN101303261A/en
Application granted granted Critical
Publication of CN101303261B publication Critical patent/CN101303261B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Abstract

An apparatus for measuring non contact type bearing start friction torque, is composed mainly of a loading cylinder (1), a force transducer (2), a loading housing (3), an air main shaft (5), an air bearing (6), a torque generator (7), a disk drive (8), an optoelectric transducer (9), an electrical system. The torque generator generates induction electromagnetic torque as drive torque, the optoelectric transducer monitors bearing start running state automatically; when being measured, the measured bearing is installed on the air main shaft, the disk drive is linked with the air main shaft and placed in the torque generator, the electrical system applies input power to the torque generator step by step after throwing axial load, when the induction electromagnetism drives the air main shaft to rotate through the disk drive, the optoelectric transducer matching-installed by the disk drive monitors the measured bearing from static state to start running state, and outputs signal to stop applying input power, and records current power value which is the start friction torque value of the measured bearing.

Description

A kind of non-contact type bearing starting friction torgue measurement method and measuring instrument
Technical field
The invention belongs to the bearing frictional torque field of measuring technique, specially refer to a kind of non-contact type bearing starting friction torgue measurement method and measuring instrument.
Background technology
Bearing starting friction performance is one of important technology index of bearing dynamic property quality, it is the key factor that influences bearing life and influence host computer system reliability and accuracy, especially the bearing that uses in the contour sophisticated technology of space flight, aviation, navigation, be operated under the normal entry condition, its moment of friction size and undulating quantity directly have influence on life-span, stability and the reliability of system works, therefore starting friction moment are had extremely strict requirement.Abroad research is relatively paid attention to the bearing starting friction, and domestic bearing starting friction moment is not had technical requirement, also exists no small gap in this respect.Along with the broad co-operation of home market and international market, some were used for the bearing of motor, Automobile turntable, household electrical appliance, medical instruments in recent years, and starting friction moment technical indicator has been proposed strict demand.
At present, domestic Production of bearing producer is to the torgue measurement of bearing starting friction, major part is according to Theoretical Calculation or adopts the simple measurement method that hangs counterweight, the error amount that causes estimation and measure is bigger, especially some main frame producers require to provide the accurate technical parameter of bearing starting friction, existing equipment can't satisfy the check and analysis of centering small size bearing starting friction moment and the requirement of performance test, can't detection by quantitative and the frictional behaviour of control bearing, so domestic urgent need will solve the instrument of measuring bearing starting friction moment.
Summary of the invention
For solving the deficiencies in the prior art part, the invention provides a kind of non-contact type bearing starting friction torgue measurement method and measuring instrument, utilize this measuring method and measuring instrument, solved a non-contact type bearing starting friction torgue measurement difficult problem, for providing reliable detection, the influence factor of analyzing the bearing frictional behaviour analyzes data, improve design bearing parameter, improvement processing technology according to this and lubricating etc. strengthened the influence factor of bearing frictional torque, thereby improves the bearing inherent quality.
In order to realize the foregoing invention purpose, the present invention has adopted following technical scheme:
Described non-contact type bearing starting friction torgue measurement method, this measuring method is according to energy conversion method measuring principle, produce inductive electromagnetic moment as driving moment by special torquer, form closed-loop system with photoelectric sensor and come automatic monitor shaft to hold the startup operating condition; Secondly application of air bearing supporting realizes contactless automatic measurement bearing starting friction moment values; At last when measuring, measured bearing is installed on the air spindle, driving-disc connects with air spindle, and place torquer, after applying axial load to measured bearing, progressively apply power input in torquer with the computing machine Automatically Controlled Electrical System, when the size of inductive electromagnetic moment drives the air spindle rotation by driving-disc, by photoelectric sensor that driving-disc was equipped with monitoring measured bearing from static state to starting operating condition, and providing signal, computer controlled automatic stops to apply power input, and record current power value, form the measuring system of a closed loop successively, and the performance number of being noted down is the starting friction moment values of measured bearing.
Described non-contact type bearing starting friction torgue measurement instrument, its measuring instrument mainly is made up of loading cylinder, force transducer, loading cover, air spindle, air bearing, torquer, driving-disc, photoelectric sensor, electrical system, wherein measured bearing is installed on the air spindle, load and overlap the outer ring that the lower surface is pressed in measured bearing, the upper end connects with force transducer, force transducer is socketed on the cylinder head that loads cylinder, and the size that applies axial load is controlled by force transducer; Air spindle is installed in the air bearing, forms bolster system, the below of the air spindle driving-disc that is connected and fixed, and the two ends of driving-disc are mounting torque generator and photoelectric sensor separately.
Described non-contact type bearing starting friction torgue measurement instrument, its electrical system comprise the instruction control that loads cylinder, the control of torquer, the signal Processing and the control of photoelectric sensor, this wherein:
1) instruction control of loading cylinder is provided by computing machine, and through I/O output, the control loaded cylinder is finished and loaded action; After measurement is finished, provide unloading command, through I/O output, the control loaded cylinder is finished the unloading action;
2) control of torquer is to the two-way coil input voltage of torquer and the control of size of current, setting input voltage is definite value, then inductive electromagnetic moment size in torquer only with the size of current of input with strict funtcional relationship is arranged, change by D/A again, the accurate Control current input precision of front end circuit, apply electric current step by step in torquer, drive driving-disc, air spindle, measured bearing rotation until the inductive electromagnetic moment that produces;
3) photo-sensor signal will is handled and control is measured bearing from static state after start operating condition, photoelectric sensor output photosignal, amplify, signal Processing such as filtering, I/O imports computing machine, control and stop to apply power input and record, form closed loop with torquer successively.
Owing to adopted technical scheme as mentioned above, the present invention has following superiority:
1), solved the difficult problem of non-contact measurement bearing starting friction moment;
2), realize that the monitoring bearing starts operating condition automatically, finish automatic measurement function, effectively solved the difficult point of instantaneous measurement;
3), by quantitative measurment bearing starting friction moment values, satisfy demand to analysis of bearing starting friction Performance Detection and performance test, also can be antifriction research foundation is provided, improve the frictional behaviour of bearing successively, improve the reliability and the accuracy of host computer system, this will play positive facilitation to the development of domestic bearing industry.
Description of drawings
Fig. 1 is contactless bearing starting friction torgue measurement instrument structural representation;
Fig. 2 is contactless bearing starting friction torgue measurement instrument electric control theory figure.
In Fig. 1: 1-loads cylinder; The 2-force transducer; 3-loads cover; The 4-measured bearing; The 5-air spindle; The 6-air bearing; The 7-torquer; The 8-driving-disc; The 9-photoelectric sensor.
Embodiment
As shown in Figure 1: measuring method of the present invention is at first according to energy conversion method measuring principle, produce inductive electromagnetic moment as driving moment with special torquer (7), form closed-loop system with photoelectric sensor (9) and come automatic monitor shaft to hold the startup operating condition; Secondly application of air bearing (6) supporting realizes contactless automatic measurement bearing starting friction moment values; At last when measuring, measured bearing (4) is installed on the air spindle (6), driving-disc connects with air spindle, and place torquer (7), after applying axial load for measured bearing (4), progressively apply power input in torquer (7) by the computer controlled automatic electrical system, when the size of inductive electromagnetic moment drives air spindle (6) rotation by driving-disc (8), photoelectric sensor (9) the monitoring measured bearing (4) that is equipped with by driving-disc (8) from static state to starting operating condition, and provide signal, computer controlled automatic stops to apply power input, and record current power value, form the measuring system of a closed loop successively, and the performance number of being noted down is the starting friction moment values of measured bearing.
Wherein measured bearing (4) is installed on the air spindle (6), load and overlap the outer ring that (3) lower surface is pressed in measured bearing (4), the upper end connects with force transducer (2), and force transducer (2) is socketed on the cylinder head that loads cylinder (1), and the size that applies axial load is controlled by force transducer (2); Air spindle (6) is installed in the air bearing (6), form bolster system, the below of air spindle (6) driving-disc (8) that is connected and fixed, the two ends of driving-disc (8) are mounting torque generator (7) and photoelectric sensor (9) separately, and the mutual control between them is finished by electrical system.
For clearly demonstrating each parts of the present invention relation each other, division is as follows:
Drive system is to realize the device of energy conversion, mainly is made up of torquer (7) and driving-disc (8).Torquer (7) is made of two electromagnets, driving-disc (8) places the gap of two electromagnets, when current element and voltage component work, the work magnetic flux of electromagnet passes driving-disc (8) and produces eddy current, owing to the eddy current on the driving-disc (8) and the interaction of alternating flux produce driving moment.Special torquer (7) is as another patent application patent.
Photoelectric sensor (9) is used to monitor the starting state of measured bearing (4), also is the ingredient of forming closed-loop measuring system feedback loop, is made up of photoelectric sensor (9) and driving-disc (8).Photoelectric sensor (9) has light source and light activated element, driving-disc (8) has the coding tooth, therefore be called code-wheel again, when torquer (7) drives the state variation of driving-disc (8) from static to motion, light source sends certain luminous flux, be mapped on the light activated element and change photoelectric sensor (9) output status signal, completion status monitoring function.
Bolster system not only requires the axial load of supporting measured bearing (4) and little frictional dissipation, and the starting friction moment that will guarantee to drive measured bearing (4) is unique loading moment, adopt aerostatic bearing as supporting, use 1/4 position slit radial air inlet structure, effectively reduce eddy current moment, the characteristics that its friction force is little realize providing condition precedent for energy conversion, guarantee the precision of measuring.
As shown in Figure 2: its electrical system of measuring instrument of the present invention comprises the instruction control that loads cylinder (1), the control of torquer (7), the signal Processing and the control of photoelectric sensor (9), this wherein:
1) instruction control of loading cylinder (1) is provided by computing machine, and through I/O output, control loaded cylinder (1) is finished and loaded action; After measurement is finished, provide unloading command, through I/O output, control loaded cylinder (1) is finished the unloading action;
2) control of torquer (7) is to the two-way coil input voltage of torquer (7) and the control of size of current, setting input voltage is definite value, then inductive electromagnetic moment size in torquer only with the size of current of input with strict funtcional relationship is arranged, change by D/A again, the accurate Control current input precision of front end circuit, apply electric current step by step in torquer, drive driving-disc (8), air spindle (5), measured bearing (4) rotation until the inductive electromagnetic moment that produces;
3) photoelectric sensor (9) signal Processing and control are measured bearings from static state after start operating condition, photoelectric sensor (9) output photosignal, amplify, signal Processing such as filtering, I/O imports computing machine, control and stop to apply power input and record, form closed loop with torquer (7) successively.
The concrete operations step is as follows: at first computing machine provides load instructions, and through I/O output, control loaded cylinder (1) is finished and loaded action, applies axial load in measured bearing (4); Carry out then and measure instruction, export through I/O, the D/A conversion, the computer controlled automatic front end circuit progressively applies power input in torquer (7), the inductive electromagnetic moment that torquer (7) produces just has the trend that driving-disc (8) rotates that drives, when the size of inductive electromagnetic moment can overcome loading moment, driving-disc (8) drives measured bearing (4) startup through the air spindle (5) of bolster system, this moment by photoelectric sensor (9) monitor driving-disc (8) from static state to starting operating condition, photoelectric sensor (9) provides signal, signal after treatment, through I/O input computing machine, computer controlled automatic stops to apply power input and notes down current power input value size, and the size of current power input value is exactly measured bearing (a 4) starting friction moment values.

Claims (3)

1, a kind of non-contact type bearing starting friction torgue measurement method, it is characterized in that: this torgue measurement method is according to energy conversion method measuring principle, produce inductive electromagnetic moment as driving moment with special torquer (7), form closed-loop system with photoelectric sensor (9) and come automatic monitor shaft to hold the startup operating condition; Secondly application of air bearing (6) supporting realizes contactless automatic measurement bearing starting friction moment values; At last when measuring, measured bearing (4) is installed on the air spindle (6), driving-disc connects with air spindle, and place torquer (7), after applying axial load for measured bearing (4), progressively apply power input in torquer (7) by the computer controlled automatic electrical system, when the size of inductive electromagnetic moment drives air spindle (6) rotation by driving-disc (8), photoelectric sensor (9) the monitoring measured bearing (4) that is equipped with by driving-disc (8) from static state to starting operating condition, and provide signal, computer controlled automatic stops to apply power input, and record current power value, form the measuring system of a closed loop successively, and the performance number of being noted down is the starting friction moment values of measured bearing.
2, a kind of non-contact type bearing starting friction torgue measurement instrument, it is characterized in that: its measuring instrument is mainly by loading cylinder (1), force transducer (2), load cover (3), air spindle (5), air bearing (6), torquer (7), driving-disc (8), photoelectric sensor (9), electrical system is formed, wherein measured bearing (4) is installed on the air spindle (6), load and overlap the outer ring that (3) lower surface is pressed in measured bearing (4), the upper end connects with force transducer (2), force transducer (2) is socketed on the cylinder head that loads cylinder (1), and the size that applies axial load is controlled by force transducer (2); Air spindle (6) is installed in the air bearing (6), form bolster system, the below of air spindle (6) driving-disc (8) that is connected and fixed, the two ends of driving-disc (8) are mounting torque generator (7) and photoelectric sensor (9) separately, and the mutual control between them is finished by electrical system.
3, a kind of non-contact type bearing starting friction torgue measurement instrument is characterized in that: its electrical system comprises the instruction control that loads cylinder (1), the control of torquer (7), the signal Processing and the control of photoelectric sensor (9), this wherein:
1) instruction control of loading cylinder (1) is provided by computing machine, and through I/O output, control loaded cylinder (1) is finished and loaded action; After measurement is finished, provide unloading command, through I/O output, control loaded cylinder (1) is finished the unloading action;
2) control of torquer (7) is to the two-way coil input voltage of torquer (7) and the control of size of current, setting input voltage is definite value, then inductive electromagnetic moment size in torquer only with the size of current of input with strict funtcional relationship is arranged, change by D/A again, the accurate Control current input precision of front end circuit, apply electric current step by step in torquer, drive driving-disc (8), air spindle (5), measured bearing (4) rotation until the inductive electromagnetic moment that produces;
3) photoelectric sensor (9) signal Processing and control are measured bearings from static state after start operating condition, photoelectric sensor (9) output photosignal, amplify, signal Processing such as filtering, I/O imports computing machine, control and stop to apply power input and record, form closed loop with torquer (7) successively.
CN2007100543864A 2007-05-11 2007-05-11 Method for measuring non-contact type bearing startup friction torque and measuring instrument thereof Expired - Fee Related CN101303261B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2007100543864A CN101303261B (en) 2007-05-11 2007-05-11 Method for measuring non-contact type bearing startup friction torque and measuring instrument thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2007100543864A CN101303261B (en) 2007-05-11 2007-05-11 Method for measuring non-contact type bearing startup friction torque and measuring instrument thereof

Publications (2)

Publication Number Publication Date
CN101303261A true CN101303261A (en) 2008-11-12
CN101303261B CN101303261B (en) 2011-02-09

Family

ID=40113272

Family Applications (1)

Application Number Title Priority Date Filing Date
CN2007100543864A Expired - Fee Related CN101303261B (en) 2007-05-11 2007-05-11 Method for measuring non-contact type bearing startup friction torque and measuring instrument thereof

Country Status (1)

Country Link
CN (1) CN101303261B (en)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102410898A (en) * 2011-08-12 2012-04-11 洛阳轴研科技股份有限公司 Test method for friction torque of back-to-back pairing minitature ball bearing under application of axial loads
CN102419229A (en) * 2011-12-09 2012-04-18 安徽巨一自动化装备有限公司 Bearing pedestal starting moment measuring apparatus
CN102472685A (en) * 2009-07-22 2012-05-23 江森自控科技公司 Apparatus and method for determining clearance of mechanical back-up bearings of turbomachinery utilizing electromagnetic bearings
CN102778313A (en) * 2012-06-02 2012-11-14 上海大学 Device for testing dynamic friction torque of precise micro rolling bearing
CN102818666A (en) * 2012-07-27 2012-12-12 北京航天控制仪器研究所 Grounding friction moment measuring method used for service life evaluation of hydrodynamic gas-lubricated bearing
CN102829905A (en) * 2012-07-27 2012-12-19 北京航天控制仪器研究所 Friction moment measurement method for life evaluation of motor ball bearing
CN103323240A (en) * 2013-04-10 2013-09-25 浙江工业大学 Device for testing axial bearing capacity of tapered air bearing
CN103743507A (en) * 2013-12-28 2014-04-23 瓦房店轴承集团有限责任公司 Torque-controlled apparatus for measuring starting torque of rotating disc bearing
CN104374511A (en) * 2014-12-09 2015-02-25 株洲联诚集团有限责任公司 Device and method for measuring radial force of rotor bearing of three-phase induction motor
CN104728498A (en) * 2015-01-12 2015-06-24 江苏金陵自控技术有限公司 Electromechanical valve electric device motor moment protection device and control circuit thereof
CN105277364A (en) * 2015-11-02 2016-01-27 常熟长城轴承有限公司 Bearing friction torque measuring instrument
CN106525425A (en) * 2016-12-05 2017-03-22 江苏大学 Bearing test device and method for static-pressure radial air bearing
CN109186856A (en) * 2018-10-30 2019-01-11 中国航发哈尔滨轴承有限公司 Start the scaling method and measurement method of measurement of friction torque instrument pressure value
CN109781320A (en) * 2018-12-25 2019-05-21 北京青云航空仪表有限公司 A kind of no inner-ring bearing friction torque testing instrument and test method
CN110095218A (en) * 2019-04-26 2019-08-06 杭州电子科技大学 Measure the electromagnetic actuator device and its measurement method of Frictional Moment for Rolling Bearings
CN111721567A (en) * 2020-06-24 2020-09-29 贵州凯敏博机电科技有限公司 Method and system for testing dynamic torque fluctuation of motor

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4235093A (en) * 1979-06-08 1980-11-25 Burroughs Corporation Low friction bearing starting torque apparatus
US4235092A (en) * 1979-06-08 1980-11-25 Burroughs Corporation Low friction bearing running torque measuring apparatus
DE3503358A1 (en) * 1985-02-01 1986-08-07 Manfred Dipl.-Ing. 7000 Stuttgart Plank Method and device for measuring frictional forces on the paths of revolution of rolling elements
CN2604674Y (en) * 2003-03-27 2004-02-25 洛阳轴研科技股份有限公司 Bearing friction force torque measuring instrument
CN2742416Y (en) * 2004-10-22 2005-11-23 中国航空工业第一集团公司第三○四研究所 Rotary inertia measuring device
CN2876755Y (en) * 2006-03-10 2007-03-07 王滢 Bearing dynamic performance tester

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102472685A (en) * 2009-07-22 2012-05-23 江森自控科技公司 Apparatus and method for determining clearance of mechanical back-up bearings of turbomachinery utilizing electromagnetic bearings
CN102410898A (en) * 2011-08-12 2012-04-11 洛阳轴研科技股份有限公司 Test method for friction torque of back-to-back pairing minitature ball bearing under application of axial loads
CN102419229B (en) * 2011-12-09 2013-07-10 安徽巨一自动化装备有限公司 Bearing pedestal starting moment measuring apparatus
CN102419229A (en) * 2011-12-09 2012-04-18 安徽巨一自动化装备有限公司 Bearing pedestal starting moment measuring apparatus
CN102778313A (en) * 2012-06-02 2012-11-14 上海大学 Device for testing dynamic friction torque of precise micro rolling bearing
CN102829905B (en) * 2012-07-27 2015-02-11 北京航天控制仪器研究所 Friction moment measurement method for life evaluation of motor ball bearing
CN102818666B (en) * 2012-07-27 2014-12-17 北京航天控制仪器研究所 Grounding friction moment measuring method used for service life evaluation of hydrodynamic gas-lubricated bearing
CN102818666A (en) * 2012-07-27 2012-12-12 北京航天控制仪器研究所 Grounding friction moment measuring method used for service life evaluation of hydrodynamic gas-lubricated bearing
CN102829905A (en) * 2012-07-27 2012-12-19 北京航天控制仪器研究所 Friction moment measurement method for life evaluation of motor ball bearing
CN103323240A (en) * 2013-04-10 2013-09-25 浙江工业大学 Device for testing axial bearing capacity of tapered air bearing
CN103743507A (en) * 2013-12-28 2014-04-23 瓦房店轴承集团有限责任公司 Torque-controlled apparatus for measuring starting torque of rotating disc bearing
CN104374511A (en) * 2014-12-09 2015-02-25 株洲联诚集团有限责任公司 Device and method for measuring radial force of rotor bearing of three-phase induction motor
CN104728498B (en) * 2015-01-12 2018-08-03 江苏金陵自控技术有限公司 The motor torque protective device and its control circuit of Electromechanical valve electric device
CN104728498A (en) * 2015-01-12 2015-06-24 江苏金陵自控技术有限公司 Electromechanical valve electric device motor moment protection device and control circuit thereof
CN105277364A (en) * 2015-11-02 2016-01-27 常熟长城轴承有限公司 Bearing friction torque measuring instrument
CN106525425A (en) * 2016-12-05 2017-03-22 江苏大学 Bearing test device and method for static-pressure radial air bearing
CN109186856A (en) * 2018-10-30 2019-01-11 中国航发哈尔滨轴承有限公司 Start the scaling method and measurement method of measurement of friction torque instrument pressure value
CN109186856B (en) * 2018-10-30 2020-10-13 中国航发哈尔滨轴承有限公司 Calibration method and measurement method for pressure value of starting friction torque measuring instrument
CN109781320A (en) * 2018-12-25 2019-05-21 北京青云航空仪表有限公司 A kind of no inner-ring bearing friction torque testing instrument and test method
CN109781320B (en) * 2018-12-25 2021-01-05 北京青云航空仪表有限公司 Friction moment tester and testing method for bearing without inner ring
CN110095218A (en) * 2019-04-26 2019-08-06 杭州电子科技大学 Measure the electromagnetic actuator device and its measurement method of Frictional Moment for Rolling Bearings
CN111721567A (en) * 2020-06-24 2020-09-29 贵州凯敏博机电科技有限公司 Method and system for testing dynamic torque fluctuation of motor

Also Published As

Publication number Publication date
CN101303261B (en) 2011-02-09

Similar Documents

Publication Publication Date Title
CN101303261B (en) Method for measuring non-contact type bearing startup friction torque and measuring instrument thereof
CN102435944B (en) Method for testing force characteristic of linear electric motor
CN103822837B (en) A kind of frictional testing machine
CN101487751B (en) Measuring apparatus for frictional moment of bearing under different axial loads and rotation speeds
CN201364215Y (en) Friction moment measuring device of bearing under different axial loads and rotating speed
CN103411715B (en) A kind of torque motor resistance moment test macro
CN101034025A (en) Automobile hub bearing friction torque tester and testing method thereof
CN205120329U (en) Novel electronic servo -type unipolar exciter test platform
CN103175568A (en) Testing device for high-speed encoder
CN108444711A (en) A kind of vibration test system of the adjustable magnetic fluid bearing of viscosity
CN106885746A (en) A kind of wideband response, large stroke experimental provision for rubber fatigue performance test
CN202092808U (en) Hysteresis torque and ripple torque tester of motor
CN108692961A (en) The chassis dynamometer of permanent magnet synchronous motor driving
CN203203812U (en) Test device for providing AC permanent magnet synchronous gearless elevator traction machine
CN110095218A (en) Measure the electromagnetic actuator device and its measurement method of Frictional Moment for Rolling Bearings
CN105262317B (en) Cam mechanism
CN201285334Y (en) Measurement instrument for detecting dynamic friction torque of bearing
CN106092424A (en) Electromagnetic brake electromagnetism force checking device
CN203376091U (en) Moment motor resistance moment test system
CN104020716B (en) Detection device for keeping precision of numerically controlled rotary table
CN105987815A (en) Universal motorcycle clutch test stand device
CN205744910U (en) A kind of magnetic suspension spring bearing for large size bearing life test rack
CN201662453U (en) Tester for starting friction torque of miniature bearing
CN106892312A (en) The Detector for elevator balance coefficient tested the speed using magnetic rollers
CN202110019U (en) Linear motor electromagnetic thrust and thrust fluctuation testing apparatus

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20110209

Termination date: 20170511

CF01 Termination of patent right due to non-payment of annual fee