CN103134991B - Equipment with resistance measurement device and method for measuring carbon brush contact resistance - Google Patents
Equipment with resistance measurement device and method for measuring carbon brush contact resistance Download PDFInfo
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- CN103134991B CN103134991B CN201110388294.6A CN201110388294A CN103134991B CN 103134991 B CN103134991 B CN 103134991B CN 201110388294 A CN201110388294 A CN 201110388294A CN 103134991 B CN103134991 B CN 103134991B
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- ring system
- slip ring
- electric current
- earth connection
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Abstract
The invention relates to equipment with a resistance measurement device. The equipment comprises a machine frame rotating part, a slip ring system and a ground lead connected with the slip ring system. The machine frame rotating part is in ground connection through the slip ring system and the ground lead. The resistance measurement device is connected with the slip ring system. The device can exert appointed voltage on the ground lead. Carbon brush contact resistance of the slip ring system is calculated through measurement of currents on the ground lead after the appointed voltage is exerted. The invention further provides a method for measuring the carbon brush contact resistance of the slip ring system. Through the adoption of the equipment or the method, that fact that the carbon brush contact resistance does not exceed 0.1omega can be guaranteed, and thus potential safety hazards are reduced or avoided.
Description
Technical field
The present invention relates to industry or medical domain, particularly a kind of have the equipment of resistance measurement device and measure the method for carbon brush contact resistance.
Background technology
According to International Electrotechnical Commission IEC 60601-1:2005; the requirement of IEC60601-2-44:2009 and IEC60601-2-28:2010, the X-ray tube in ct apparatus (CT) and high pressure generator must be connected on the power supply with protective grounding.In current CT equipment, the connection between frame rotating part and frame stationary part between power supply and ground connection is all realized by the carbon brush of slip ring system.Because carbon brush Long-Time Service has wearing and tearing, the elastic pressure of spring on this effect of attrition carbon brush, carbon brush contact resistance is caused to become large, then carbon brush contact resistance cannot be ensured (namely, the earth resistance of frame rotating part) be no more than 0.1 Ω, therefore probably cause safety problem and power quality problem.Current CT equipment guarantees device security by periodic replacement carbon brush, but if carbon brush before periodic replacement just because operation improper use and serious wear, so this periodic replacement with regard to very not in time, for safety hides some dangers for; And if it is good to find after unloading original carbon brush that carbon brush uses, not wearing and tearing, so this dismounting is with regard to waste of manpower and cost.
Summary of the invention
The object of the present invention is to provide a kind of equipment with resistance measurement device and the method measuring carbon brush contact resistance, the carbon brush contact resistance of its measuring space slip ring system at a fixed time, ensure that its resistance is no more than 0.1 Ω, thus reduce or avoid potential safety hazard.
In view of this, the invention provides a kind of equipment with a resistance measurement device, this equipment comprises a frame rotating part, a slip ring system and an earth connection be connected with this slip ring system, described frame rotating part is by described slip ring system and described ground connection, described resistance measurement device is connected with described slip ring system, this device can apply a given voltage on described earth connection, and the electric current after applying this given voltage by measurement on described earth connection calculates the carbon brush contact resistance of described slip ring system.To ensure that carbon brush contact resistance is no more than 0.1 Ω, avoid causing safety problem and power quality problem.
According to one embodiment of present invention, described resistance measurement device comprises a voltage generator, a voltage conveyer, an electric current receiver and a calculator, wherein, described voltage generator is for generation of described given voltage, and this given voltage has an assigned frequency; Described voltage conveyer is for being applied to described earth connection by described given voltage; Described electric current receiver is for receiving the electric current applied after described given voltage on described earth connection; Described calculator is used for obtaining a resistance value according to described given voltage and described electric current.To measure described carbon brush contact resistance value.
According to another embodiment of the invention, described given voltage is applied to described earth connection by the first induction coil by described voltage conveyer, and described electric current receiver receives the electric current on described earth connection by the second induction coil.
According to still a further embodiment, described resistance measurement device comprises a wave filter further, described wave filter is used for carrying out filtering to the electric current that described electric current receiver receives, and obtains the electric current with described assigned frequency, and is supplied to described calculator as described electric current.
Further, described resistance measurement device comprises a controller, for sending the instruction producing voltage to described voltage generator.
Further, described resistance measurement device comprises a comparator, and described comparator is used for described resistance value to compare with a threshold resistance value, and sends this comparative result to described controller; If described resistance value is greater than described threshold resistance value, then described controller sends the instruction of the carbon brush changing described slip ring system.
According to still another embodiment of the invention, described resistance measurement device is positioned at described frame rotating part.
According to still another embodiment of the invention, described equipment is X ray computer Laminographic device.
The present invention also provides a kind of method measuring the carbon brush contact resistance of slip ring system, this slip ring system is arranged in the equipment that one has a frame rotating part, this equipment also comprises an earth connection be connected with described slip ring system, described frame rotating part is by described slip ring system and described ground connection, described method comprises: for described equipment provides a resistance measurement device, it is connected with described slip ring system; Apply a given voltage on described earth connection; Current value after this given voltage of measurement applying on described earth connection; The resistance value of described carbon brush contact resistance is calculated according to described given voltage and described current value.
According to one embodiment of present invention, described applying voltage to earth connection comprises: by the first induction coil, described given voltage is applied on described earth connection.
According to another embodiment of the invention, the electric current on the described earth connection of described measurement comprises: receive electric current on described earth connection to measure by the second induction coil.
Further, described method comprises: carry out filtering to described electric current, obtains the electric current with described given voltage frequency; Described resistance value is calculated according to described given voltage and the described electric current with given voltage frequency.
Further, described method comprises: described resistance value compared with a threshold resistance value, if described resistance value is greater than described threshold resistance value, then sends the instruction of the carbon brush changing described slip ring system.
As can be seen from such scheme, owing to the invention provides a kind of method of resistance measurement device and mensuration carbon brush contact resistance, to measure the carbon brush contact resistance of slip ring system, thus in Fixed Time Interval, immediately measure the resistance value of carbon brush contact resistance, ensure that it is no more than 0.1 Ω, and then reduce or avoid potential safety hazard.
Accompanying drawing explanation
The preferred embodiments of the present invention will be described in detail by referring to accompanying drawing below, make clearer above-mentioned and other feature and advantage of the present invention of those skilled in the art, in accompanying drawing:
Fig. 1 is the equipment schematic diagram with a resistance measurement device of the present invention.
Fig. 2 is the method schematic diagram that the present invention measures the carbon brush contact resistance of slip ring system.
Reference numeral
1-controller 2-voltage generator 3-wave filter
4-calculator 5-comparator 6-voltage conveyer
7-earth connection 8-electric current receiver 9-carbon brush
10-slip ring system 11-frame stationary part earthing bar 12-spinner member
13-resistance measurement device 14-frame rotating part earthing bar
Detailed description of the invention
The invention provides a kind of equipment with resistance measurement device and the method measuring carbon brush contact resistance, in Fixed Time Interval, measure the carbon brush contact resistance of slip ring system, to ensure that it is no more than 0.1 Ω, thus reduce or avoid potential safety hazard.
Fig. 1 is the equipment schematic diagram with a resistance measurement device of the present invention.The earth connection 7 that this equipment comprises frame rotating part, slip ring system 10 and is connected with slip ring system 10, its mid frame rotating part is by slip ring system 10 and earth connection 7 ground connection, and resistance measurement device 13 is connected with slip ring system 10.The left side of Fig. 1 illustrates frame rotating part with frame rotating part earthing bar 14 and spinner member 12, the right side of Fig. 1 illustrates frame stationary part with frame stationary part earthing bar 11, frame stationary part is powered by the spinner member 12 of slip ring system 10 to frame rotating part, one end of spinner member 12 is by frame rotating part earthing bar 14 ground connection, to guarantee safety, conveniently only illustrate a spinner member 12 in figure.
In Fig. 1, resistance measurement device 13 can apply a given voltage on earth connection 7, and the electric current after applying this given voltage by measurement on earth connection 7 calculates the carbon brush contact resistance of slip ring system 10, to ensure that it is no more than 0.1 Ω.Wherein, resistance measurement device 13 comprises voltage generator 2, voltage conveyer 6, electric current receiver 8 and a calculator 4, particularly:
Voltage generator 2 has the high frequency voltage of frequency f _ test and magnitude of voltage V_test for generation of one, and f_test will avoid the Hz noise of 50Hz here.
The high frequency voltage that high pressure generator 2 generates is applied on earth connection 7 by voltage conveyer 6, such as by high frequency injection mode by this high frequency signal injection on the earth connection 7 be connected between rotating part earthing bar 14 and slip ring system 10, so earth connection 7 just there is electric current pass through, this electric current not only comprises the high frequency electric i_test with frequency f _ test because high frequency voltage produces, and also comprises earth-current i_earth and the high frequency noise current i_noise of the electromagnetic interference caused because of frequency conversion and ground connection.
Electric current receiver 8 for receiving the electric current applied after this high frequency voltage on earth connection 7, i.e. (i_test+i_earth+i_noise).Such as, voltage conveyer 6 utilizes the first induction coil to inject to earth connection 7 by high frequency voltage by electromagnetic induction, then electric current receiver 8 also can utilize the second induction coil to receive the electric current on earth connection 7 by electromagnetic induction.
The electric current that calculator 4 receives for the high frequency voltage that generates according to voltage generator 2 and electric current receiver 8 obtains a resistance value R, R=V_test/ (i_test+i_earth+i_noise), the carbon brush contact resistance value of this resistance value and slip ring system 10, the namely grounding resistance of frame rotating part.
As previously mentioned, the electric current received due to electric current receiver 8 comprises disturbance current i_earth and i_noise, both affects the accuracy of resistance value R, so resistance measurement device 13 of the present invention comprises a wave filter 3 further, electric current for receiving electric current receiver 8 carries out filtering, to filter current i _ earth and i_noise, as far as possible only be there is the high frequency electric i_test of frequency f _ test, and i_test is supplied to calculator 4, so calculator 4 obtains more accurate resistance value R=V_test/i_test according to the high frequency voltage V_test with frequency f _ test with the high frequency electric i_test with frequency f _ test.
Further, resistance measurement device 13 comprises a controller 1, for sending the instruction producing high frequency voltage in Fixed Time Interval to voltage generator 2, such resistance measurement device 13 can measure the carbon brush contact resistance of slip ring system in Fixed Time Interval, both can not run to equipment and cause larger burden, can immediately check carbon brush contact resistance again, to ensure safety.
Further, resistance measurement device 13 comprises a comparator 5, for the resistance value that obtained by calculator 4 and a threshold resistance value R
0compare, and send comparative result to controller 1, if the resistance value that calculator 4 obtains is more than or equal to R
0, illustrate that carbon brush is aging or impaired, then controller 1 sends the instruction of the carbon brush 9 changing slip ring system 10; If the resistance value that calculator 4 obtains is less than R
0, then do not send instruction or provide the instruction of carbon brush operational excellence.Here, R
0it can be the resistance value being less than or equal to 0.1 Ω.
In embodiment shown in Fig. 1, resistance measurement device 13 is positioned at frame rotating part, such as, be positioned in rotary turnplate, now also will meet the requirement of frame High Rotation Speed.Resistance measurement device can also be positioned at outside equipment, is connected with frame rotating part by lead-in wire, one skilled in the art will appreciate that the length that now goes between and designs the requirement that will meet frame High Rotation Speed.
The equipment with a frame rotating part of the present invention can be Medical CT equipment, industrial CT equipment or other equipment well known to those skilled in the art etc.
Fig. 2 is the method schematic diagram that the present invention measures the carbon brush contact resistance of slip ring system.This slip ring system 10 is arranged in the equipment that one has a frame rotating part, and this equipment also comprises an earth connection 7 be connected with slip ring system 10, and frame rotating part is by slip ring system 10 and earth connection 7 ground connection, and described method comprises:
Step 101, provides a resistance measurement device 13, and this device is connected with a slip ring system 10, applies a given voltage on earth connection 7.
Such as produce by voltage generator 2 high frequency voltage that has frequency f _ test and magnitude of voltage V_test, and by the first induction coil, this high frequency voltage is applied on earth connection 7 by electromagnetic induction.
Step 102, measures the current value applied after this given voltage on earth connection 7, such as, receive electric current on described earth connection to measure by the second induction coil.
Because high frequency voltage is applied on earth connection 7, so earth connection 7 just there is electric current pass through, this electric current not only comprises high frequency electric i_test, also comprises current i _ earth and high frequency noise current i_noise intrusively.
Step 103, the current value obtained according to described given voltage and step 102 calculates the resistance value R of carbon brush contact resistance.
R=V_test/ (i_test+i_earth+i_noise), the grounding resistance of this resistance value i.e. frame rotating part.
The electric current obtained due to step 102 comprises disturbance current i_earth and i_noise, and both affects the accuracy of resistance value R, and institute comprises with the inventive method further:
Step 104, carries out filtering to the electric current that step 102 obtains, to obtain current i _ test.
Using the output of current i _ test as step 102, so calculate resistance value according to voltage V_test and current i _ test, obtain R=V_test/i_test.
Further, method of the present invention comprises:
Step 105, the resistance value that step 103 or step 104 are obtained and a threshold resistance value R
0relatively, if resistance value is greater than threshold resistance value R
0, then the instruction of the carbon brush 9 changing described slip ring system 10 is sent; If resistance value is less than R
0, then do not send instruction or provide the instruction of carbon brush operational excellence.Here, R
0it can be the resistance value being less than or equal to 0.1 Ω.
The present invention relates to a kind of equipment with a resistance measurement device, this equipment comprises a frame rotating part, a slip ring system and an earth connection be connected with this slip ring system, described frame rotating part is by described slip ring system and described ground connection, described resistance measurement device is connected with described slip ring system, this device can apply a given voltage on described earth connection, and the electric current after applying this given voltage by measurement on described earth connection calculates the carbon brush contact resistance of described slip ring system.The present invention also provides a kind of method measuring the carbon brush contact resistance of slip ring system.Adopt equipment of the present invention or method can ensure that carbon brush contact resistance is no more than 0.1 Ω, thus reduce or avoid potential safety hazard.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (12)
1. one kind has the equipment of a resistance measurement device, this equipment comprises a frame rotating part, a slip ring system (10) and an earth connection (7) be connected with this slip ring system (10), described frame rotating part is by described slip ring system (10) and described earth connection (7) ground connection, it is characterized in that
Described resistance measurement device (13) is positioned at described frame rotating part, and described resistance measurement device (13) is connected with described slip ring system (10), this device can have a given voltage of an assigned frequency in the upper applying of described earth connection (7), the electric current after applying this given voltage by measurement on described earth connection (7) calculates the carbon brush contact resistance of described slip ring system (10).
2. equipment according to claim 1, it is characterized in that, described resistance measurement device (13) comprises a voltage generator (2), a voltage conveyer (6), an electric current receiver (8) and a calculator (4), wherein
Described voltage generator (2) is for generation of described given voltage;
Described voltage conveyer (6) is for being applied to described earth connection by described given voltage;
Described electric current receiver (8) is for receiving the electric current applied after described given voltage on described earth connection;
Described calculator (4) is for obtaining a resistance value according to described given voltage and described electric current.
3. equipment according to claim 2, it is characterized in that, described given voltage is applied to described earth connection (7) by the first induction coil by described voltage conveyer (6), and described electric current receiver (8) receives the electric current on described earth connection (7) by the second induction coil.
4. equipment according to claim 2, is characterized in that, described resistance measurement device (13) comprises a wave filter (3) further,
Described wave filter (3) carries out filtering for the electric current received described electric current receiver (8), obtains the electric current with described assigned frequency, and is supplied to described calculator (4) as described electric current.
5. equipment according to claim 2, is characterized in that, described resistance measurement device (13) comprises a controller (1) further, for sending the instruction producing voltage to described voltage generator (2).
6. equipment according to claim 5, is characterized in that, described resistance measurement device comprises a comparator (5) further,
Described comparator (5) for described resistance value being compared with a threshold resistance value, and sends this comparative result to described controller (1);
If described resistance value is greater than described threshold resistance value, then described controller (1) sends the instruction of the carbon brush (9) changing described slip ring system (10).
7. equipment according to claim 1, is characterized in that, described equipment is X ray computer Laminographic device.
8. one kind measures the method for the carbon brush contact resistance of slip ring system, this slip ring system (10) is arranged in the equipment that one has a frame rotating part, this equipment also comprises an earth connection (7) be connected with described slip ring system (10), described frame rotating part is by described slip ring system (10) and described earth connection (7) ground connection, it is characterized in that, described method comprises:
For described equipment provides a resistance measurement device (13), it is positioned at described frame rotating part, and is connected with described slip ring system (10);
Applying has a given voltage of an assigned frequency on described earth connection (7);
Current value after this given voltage of measurement applying on described earth connection (7);
The resistance value of described carbon brush contact resistance is calculated according to described given voltage and described current value.
9. method according to claim 8, is characterized in that, described applying voltage comprises to earth connection (7):
By the first induction coil, described given voltage is applied on described earth connection.
10. method according to claim 8, is characterized in that, described measurement current value comprises:
Electric current on described earth connection (7) is received to measure by the second induction coil.
11. methods according to claim 8, is characterized in that, described method comprises further:
Filtering is carried out to described electric current, obtains the electric current with described given voltage frequency;
Described resistance value is calculated according to described given voltage and the described electric current with given voltage frequency.
Method described in 12. according to Claim 8 or 11, is characterized in that, described method comprises further:
Described resistance value is compared with a threshold resistance value, if described resistance value is greater than described threshold resistance value, then sends the instruction of the carbon brush (9) changing described slip ring system (10).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110388294.6A CN103134991B (en) | 2011-11-29 | 2011-11-29 | Equipment with resistance measurement device and method for measuring carbon brush contact resistance |
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|---|---|---|---|
| CN201110388294.6A CN103134991B (en) | 2011-11-29 | 2011-11-29 | Equipment with resistance measurement device and method for measuring carbon brush contact resistance |
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| CN103134991A CN103134991A (en) | 2013-06-05 |
| CN103134991B true CN103134991B (en) | 2015-04-29 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106483382A (en) * | 2016-11-23 | 2017-03-08 | 云南电网有限责任公司电力科学研究院 | A kind of GIS circuit loop resistance measuring instrument and measuring method |
| CN108168775B (en) * | 2017-12-28 | 2020-06-12 | 马卫富 | Force sensitive resistance tester |
| CN110308331A (en) * | 2019-05-22 | 2019-10-08 | 深圳安科高技术股份有限公司 | A kind of CT slip ring state online test method and system |
| CN110411628B (en) * | 2019-07-01 | 2021-06-25 | 东南大学 | Slip ring type wheel force sensor dynamic transmission error correction system and correction method thereof |
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| JP3771836B2 (en) * | 2001-12-11 | 2006-04-26 | 三菱電機株式会社 | Brush generator detection system for automotive alternator |
| CN1178339C (en) * | 2002-05-30 | 2004-12-01 | 武汉华之洋光电系统有限责任公司 | Durable rotary electric contactor |
| DE102004031306A1 (en) * | 2004-06-29 | 2006-01-19 | Robert Bosch Gmbh | Automotive energy management with additional functionality Starter diagnosis |
| CN2804834Y (en) * | 2005-06-08 | 2006-08-09 | 曹健 | Filmatic bearing fault testing device |
| CN100486525C (en) * | 2006-01-26 | 2009-05-13 | 上海西门子医疗器械有限公司 | CT slip-ring system based on optical fibre data transmission |
| US20090015083A1 (en) * | 2007-07-11 | 2009-01-15 | Li-Min Hsieh | Shaft grounding thread structure of an electric motor |
| CN201096839Y (en) * | 2007-10-18 | 2008-08-06 | 武汉铁工科技发展有限公司 | An AC electromotor insulation resistance detection device |
| CN201122782Y (en) * | 2007-11-26 | 2008-09-24 | 黄理 | Carbon brush abrasion reminding device of carbon brush electric motor |
| CN101588112B (en) * | 2009-07-01 | 2012-09-05 | 唐德尧 | Electric brush slip ring fault diagnosis Device for fault mechanism diagnosis and maintenance and design method |
| CN201854023U (en) * | 2010-11-26 | 2011-06-01 | 哈尔滨哈飞工业有限责任公司 | Lightning protection system of wind generating set |
| CN201887304U (en) * | 2010-12-15 | 2011-06-29 | 北车风电有限公司 | Lightning protection and grounding carbon brush abrasion alarm system for wind power generator |
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