CN105319464A - Measuring method of optimal wearing quantity of brush used for motor - Google Patents
Measuring method of optimal wearing quantity of brush used for motor Download PDFInfo
- Publication number
- CN105319464A CN105319464A CN201510683270.1A CN201510683270A CN105319464A CN 105319464 A CN105319464 A CN 105319464A CN 201510683270 A CN201510683270 A CN 201510683270A CN 105319464 A CN105319464 A CN 105319464A
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- China
- Prior art keywords
- brush
- electromachine
- motor
- collector ring
- brush used
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Motor Or Generator Current Collectors (AREA)
Abstract
The invention belongs to the field of important assemblies of electrical equipment and provides a measuring method of an optimal wearing quantity of a brush used for a motor. The method comprises the steps of: by adjusting a force applied by a pressure device and a contact area between the brush used for the motor and a collector ring, changing the pressure intensity applied to the brush used for the motor, and adjusting the pressure intensity applied to the brush used for the motor to be in the range of 4-8*10<4> Pa; secondly, adjusting a constant current source current and the contact area between the brush used for the motor and the collector ring, and changing the current density of the brush used for the motor; adjusting the current density to be in the range of 8-12 A/cm3; then adjusting the rotating speed of the servo motor to be in the range of 300-1000 rpm; selecting a brush material which is 20-50 in Shore hardness and lower than 0.3 in friction coefficient; and based on a test platform, utilizing an orthogonal test method to obtain the optimal wearing quantity of the brush used for the motor, and determining most suitable factors of the brush used for the motor. The method is simple, is easy to carry out and can be widely applied to all power plants; and by adopting method, the test time is substantially shortened, and the benefits of the power plants are improved.
Description
Technical field
The invention belongs to electrical equipment significant components field, relate to the measurement of the optimum wear extent of brush for electromachine, the particularly measurement of the optimum state of wear of large-size machine brush.
Technical background
In China, power industry as national economy produce in an important ring, motor as generating in visual plant, can stable operation most important.Brush for electromachine belongs to the key component of conduction current in motor.Its performance quality governs the fast development of China's power industry.
Brush wear is seriously a very common problem in actual motion.The wearing and tearing of brush and collector ring are the complicated physical phenomenas of relative object movement.Current research brush wear situation, what substantially adopt is test now to survey method, concerning existing power plant, how to reduce test number (TN), shortening time and avoids blindness, the technical barrier that the urgent need that obtain an optimal result has become everybody facing simultaneously solves.
Summary of the invention
Technical matters to be solved by this invention is brush wear this problem serious tightly existed in current power plant, invents the measuring method that a kind of brush for electromachine runs best wear extent.The method, by actual condition data, carries out orthogonal test based on lab platform, can obtain the correlative factor level value of the optimum wear extent of brush fast, and be applied in Practical Project, thus extend Service Life of Carbon Brush, improve power plants generating electricity efficiency.
The technical solution used in the present invention:
A measuring method for the optimum wear extent of brush for electromachine, this measuring method based on test platform, and uses orthogonal experiment to measure, and step is as follows:
The test platform that brush for electromachine runs the measuring method of optimum wear extent used comprises mechanical hook-up, electric device and measurement mechanism; Mechanical hook-up is used for fixed electrical machinery brush, makes it contact with collector ring; Electric current is flowed to collector ring and brush for electromachine by electric device; Measurement mechanism by the Signal transmissions that collects to host computer; Mechanical hook-up comprises brush carrier, collector ring, driving shaft and pressue device; Brush carrier is used for fixed electrical machinery brush; Pressue device adopts adjustable force spring, is positioned at brush carrier and applies constant force in brush for electromachine; Collector ring is connected with motor by driving shaft, and drive motor drives collector ring at the uniform velocity to rotate; Electric device comprises constant current source and slide rheostat, constant current source delivered constant direct current, and slide rheostat is for the protection of each device; Measurement mechanism comprises collection signal device and host computer; Collection signal device is for measuring constant current source output current value, pressue device applying force value and collector ring rotating speed; By sensing element, signals collecting is transformed into digital signal and passes to host computer;
First by regulating pressue device to apply power, brush for electromachine and collector ring contact area, change pressure suffered by brush for electromachine, the ratio that pressue device applies power and contact area is pressure suffered by brush for electromachine, regulates pressure suffered by brush for electromachine to be 4-8*10
4pa; Secondly, regulate constant current source electric current, brush for electromachine and collector ring contact area, change by brush for electromachine current density; The ratio of constant current source electric current and contact area is brush for electromachine current density, and adjustment current density is 8-12A/cm
3; Regulate servomotor rotating speed at 300-1000rpm again; Choosing Shore hardness is 20-50, the brush material of friction factor below 0.3;
Brush for electromachine rate of wear is the wear volume that brush for electromachine runs every km, and brush for electromachine wear volume is the ratio of the of poor quality and density of brush for electromachine before and after wearing and tearing;
Orthogonal arrage is set up according to orthogonal experiment, and service test platform, try to achieve brush for electromachine rate of wear according to brush for electromachine is of poor quality before and after test; Try to achieve the extreme difference of pressure suffered by brush for electromachine, brush for electromachine current density, motor speed and brush material four factors according to orthogonal arrage, judge to affect brush for electromachine wear extent size by extreme difference, draw the optimum attrition value of brush.
The invention has the beneficial effects as follows and use orthogonal experiment to record the optimum attrition value of brush for electromachine based on test platform, determine the most suitable factor of brush for electromachine, method is simple, can be widely used in each power plant, significantly shorten test period, improves profit from power plant.
Accompanying drawing explanation
Fig. 1 carbon brush abrasion platform basic block diagram.
Fig. 2 power plant Brush Grinding loss rate and each factor relation figure (rate of wear is the wear volume that brush for electromachine runs every km).
In figure: 1 constant current source; 2 slide rheostats; 3 brush carriers; 4 brush for electromachine; 5 collector rings; 6 driving shafts; 7 pressue devices; 8 collection signal devices.
Embodiment
Concrete scheme of the present invention is further illustrated below in conjunction with accompanying drawing and technical scheme.
First, make specific aim for motor brush wear in the actual condition of certain hydroelectric power plant and measure, build the test platform shown in Fig. 1.Analyze the selection range of each factor.Material elements level value is as shown in table 1.Brush for electromachine orthogonal test mark is designated as L
a(b
c), wherein a represents test number (TN), and each factor of b representative test gets how many times test sample, and c represents experimental factor.In this experiment, experimental factor is A (suffered by brush for electromachine pressure), B (motor speed), C (brush for electromachine current density), D (brush material).Choose L
9(3
4) be orthogonal test table, carry out the test card of brush wear, test number (TN) is 9 times.
Table 1 orthogonal test designs table factor level value
Measurement result is as shown in table 2.
Table 2 Brush Grinding loss rate orthogonal arrage
By the rate of wear of trying to achieve, according to extremum difference analysis, draw table 3, k in table
1for level 1 lower brush rate of wear index sum, k
2for level 2 lower brush rate of wear index sum, k
3for level 3 lower brush rate of wear index sum.K
10for the mean value of level 1 lower brush rate of wear, k
20for the mean value of level 2 lower brush rate of wear, k
30for the mean value of level 3 lower brush rate of wear.By comparing maximum value in mean value and minimal value draws extreme difference R.And draw out Fig. 2 by table 3.Fig. 2 show that at this moment under test condition, affecting Brush Grinding loss rate factor is pressure suffered by brush material, brush, brush for electromachine current density and motor speed successively.Can be reached a conclusion by table 3 and Fig. 2: under present level condition, its best factor level is A
1b
1c
1d
3.
Table 3 range analysis table
By analyzing the conspicuousness judging to affect carbon brush abrasion rate factor, be reduced the optimum test condition of brush wear amount, namely pressure is near 5.5E+04, and current density is at 8A/cm
3, rotating speed is at 800r/min, and Brush Grinding loss rate now reaches minimum.The method, compared with traditional real-time monitored method, provides a kind of new thinking, improves test efficiency, simplify test method, extends brush for electromachine serviceable life, finally improves economy of power plant benefit.
Claims (1)
1. a measuring method for the optimum wear extent of brush for electromachine, it is characterized in that, this measuring method based on test platform, and uses orthogonal experiment to measure, and step is as follows:
The test platform that brush for electromachine runs the measuring method of optimum wear extent used comprises mechanical hook-up, electric device and measurement mechanism; Mechanical hook-up is used for fixed electrical machinery brush, makes it contact with collector ring; Electric current is flowed to collector ring and brush for electromachine by electric device; Measurement mechanism by the Signal transmissions that collects to host computer; Mechanical hook-up comprises brush carrier, collector ring, driving shaft and pressue device; Brush carrier is used for fixed electrical machinery brush; Pressue device adopts adjustable force spring, is positioned at brush carrier and applies constant force in brush for electromachine; Collector ring is connected with motor by driving shaft, and drive motor drives collector ring at the uniform velocity to rotate; Electric device comprises constant current source and slide rheostat, constant current source delivered constant direct current, and slide rheostat is for the protection of each device; Measurement mechanism comprises collection signal device and host computer; Collection signal device is for measuring constant current source output current value, pressue device applying force value and collector ring rotating speed; By sensing element, signals collecting is transformed into digital signal and passes to host computer;
First by regulating pressue device to apply power, brush for electromachine and collector ring contact area, change pressure suffered by brush for electromachine, the ratio that pressue device applies power and contact area is pressure suffered by brush for electromachine, pressure suffered by adjustment brush for electromachine be 4 ?8*10
4pa; Secondly, regulate constant current source electric current, brush for electromachine and collector ring contact area, change by brush for electromachine current density; The ratio of constant current source electric current and contact area is brush for electromachine current density, regulate current density be 8 ?12A/cm
3; Regulate again servomotor rotating speed 300 ?1000rpm; Choose Shore hardness be 20 ?50, the brush material of friction factor below 0.3;
Brush for electromachine rate of wear is the wear volume that brush for electromachine runs every km, and brush for electromachine wear volume is the ratio of the of poor quality and density of brush for electromachine before and after wearing and tearing;
Orthogonal arrage is set up according to orthogonal experiment, and service test platform, try to achieve brush for electromachine rate of wear according to brush for electromachine is of poor quality before and after test; The extreme difference of pressure suffered by brush for electromachine, brush for electromachine current density, motor speed and brush material four factors is tried to achieve according to orthogonal arrage, judge to affect brush for electromachine wear extent size by extreme difference, show that the factor affecting the optimum wear extent of brush for electromachine is followed successively by pressure suffered by brush material, brush, brush for electromachine current density and motor speed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510683270.1A CN105319464A (en) | 2015-10-20 | 2015-10-20 | Measuring method of optimal wearing quantity of brush used for motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510683270.1A CN105319464A (en) | 2015-10-20 | 2015-10-20 | Measuring method of optimal wearing quantity of brush used for motor |
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| Publication Number | Publication Date |
|---|---|
| CN105319464A true CN105319464A (en) | 2016-02-10 |
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| CN201510683270.1A Pending CN105319464A (en) | 2015-10-20 | 2015-10-20 | Measuring method of optimal wearing quantity of brush used for motor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018014147A1 (en) * | 2016-07-19 | 2018-01-25 | 黄继林 | Brush current control system, and brush current intelligent control system and control method |
| WO2019113722A1 (en) * | 2017-12-13 | 2019-06-20 | 黄继林 | Brush current equalizing control method |
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2015
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| US20030000282A1 (en) * | 2001-06-30 | 2003-01-02 | Korea Institute Of Science And Technology | Fine friction and wear test apparatus for plate specimen |
| CN101008598A (en) * | 2007-01-05 | 2007-08-01 | 哈尔滨工业大学 | Friction and wear tester |
| CN101629888A (en) * | 2008-07-14 | 2010-01-20 | 宋冬冬 | Improved pin-on-disc friction wear testing machine |
| CN202421000U (en) * | 2012-02-23 | 2012-09-05 | 湖南大学 | Tester for current-carrier friction abrasion of electric contact materials |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018014147A1 (en) * | 2016-07-19 | 2018-01-25 | 黄继林 | Brush current control system, and brush current intelligent control system and control method |
| CN109417260A (en) * | 2016-07-19 | 2019-03-01 | 黄继林 | Brush current control system, brush current intelligence control system and control method |
| CN109417260B (en) * | 2016-07-19 | 2020-11-10 | 黄继林 | Electric brush current control system, electric brush current intelligent control system and control method |
| WO2019113722A1 (en) * | 2017-12-13 | 2019-06-20 | 黄继林 | Brush current equalizing control method |
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Application publication date: 20160210 |