CN113606177B - Method for testing and calculating service life of brushed fan - Google Patents
Method for testing and calculating service life of brushed fan Download PDFInfo
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- CN113606177B CN113606177B CN202110962325.8A CN202110962325A CN113606177B CN 113606177 B CN113606177 B CN 113606177B CN 202110962325 A CN202110962325 A CN 202110962325A CN 113606177 B CN113606177 B CN 113606177B
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- carbon brush
- fan
- temperature
- calculating
- fan assembly
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/001—Testing thereof; Determination or simulation of flow characteristics; Stall or surge detection, e.g. condition monitoring
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
Abstract
The invention discloses a method for testing and calculating the service life of a brushed fan, which comprises the following steps: step 1, acquiring a corresponding relation between the actual running time of a fan and the ambient temperature; step 2, calculating the annual operation time of the fan at different environmental temperatures; step 3, measuring the initial size A of the carbon brush; step 4, respectively placing each fan assembly in different high-temperature boxes; step 5, starting the fan assembly; step 6, continuously operating the fan assembly until the temperature of the carbon brush is stable and then operating for more than a preset time; step 7, measuring the abrasion length of the carbon brush, and calculating the abrasion loss of the carbon brush per hour; step 8, calculating the abrasion loss of the carbon brush at different temperatures all year round; step 9, calculating the annual carbon brush abrasion loss; step 10, calculating the carbon brush abrasion quantity M of the fan in the design life of the vehicle; and 11, judging whether the service life of the fan assembly meets the design requirement. The service life of the carbon brush is directly calculated, and whether the existing design meets the service life requirement or not is evaluated.
Description
Technical Field
The invention relates to the technical field of brushed fan testing, in particular to a method for testing and calculating the service life of a brushed fan.
Background
The cooling system of the automobile is one of various large systems of the automobile, and the main purpose of the cooling system is to cool a heat source, namely a pure electric automobile or a fuel automobile. The cooling system mainly comprises a radiator, a cooling fan, a water pipe and a water pump, wherein the radiator is arranged at the front end of the vehicle, the cooling fan is arranged behind the radiator, when the vehicle runs, airflow flows through the radiator through an opening of the front protective grid to cool anti-freezing liquid in the radiator, when the head-on air speed formed by the speed of the vehicle is not matched with the heat exchange requirement of the radiator, the cooling fan is required to run, the head-on air speed of the radiator is improved, the ventilation volume of the whole radiator is improved, the heat exchange efficiency of the radiator is further improved, the water temperature is guaranteed to be within a target range, and abnormal work of a vehicle power system caused by high water temperature is avoided.
The cooling fan is divided into a brush fan and a brushless fan according to the structural form, and the main difference is whether a carbon brush structure exists or not, because the cost of the brushless fan is higher than that of the brush fan and the manufacturing difficulty is slightly higher, at present, most doors on automobiles adopt the brush cooling fan, the cooling fan mainly comprises a fan guard, fan blades, a motor and a speed regulating resistor, a fan assembly is fixed with a radiator or an automobile body through the installation point of the fan guard, the motor drives the fan blades to rotate to generate air volume, current passes through the motor rotor through the carbon brush, the motor rotor cuts a magnetic induction line to rotate to drive the fan blades, during the operation process of the motor, the carbon brush and the commutator move relatively, the carbon brush has certain abrasion, the abrasion amount is different under different rotating speeds and different environmental temperatures, and when the carbon brush is abraded to a certain degree, the carbon brush and the commutator can not normally contact, the motor can fail, the method cannot work, but at present, no scientific method is used for evaluating the service life of the carbon brush in the product development stage.
Therefore, it is necessary to develop a new method for calculating the lifetime of the brushed fan.
Disclosure of Invention
The invention aims to provide a method for testing and calculating the service life of a brushed fan, which can test the brushed fan on a whole vehicle and calculate the service life of a carbon brush of the brushed fan according to a test result.
The invention discloses a method for testing and calculating the service life of a brush fan, which comprises the following steps:
grouping the data, and calculating the annual operation time of the fans at different environmental temperatures according to basic data;
step 3, arranging a temperature sensor on a carbon brush of the motor, measuring the initial size A of the carbon brush, assembling the carbon brush into the motor, finally assembling into a fan assembly, and numbering the fan assembly;
step 4, respectively placing each fan assembly in different high-temperature boxes, setting the temperature of the high-temperature boxes to different environmental temperatures, and setting the environmental temperatures according to the temperature collected in the step 1;
step 5, starting the fan assembly, continuously operating, and monitoring the temperature of the carbon brush;
step 6, continuously operating the fan assembly until the temperature of the carbon brush is stable and then operating for more than preset time;
step 7, measuring the abrasion length of the carbon brush, and calculating the abrasion loss of the carbon brush per hour at the environmental temperature;
step 8, respectively calculating the abrasion loss of the carbon brush at different temperatures in the whole year according to the long running data of the fan at different temperatures counted by the actual vehicle;
step 9, accumulating the wear loss at different temperatures in the whole year to obtain the wear loss of the carbon brush in the whole year;
step 10, multiplying the annual carbon brush abrasion loss by the design service life of the vehicle to obtain the carbon brush abrasion loss M of the fan in the design service life of the vehicle;
and 11, comparing the M with the initial size A of the carbon brush, wherein if the M is larger than or equal to the A, the life design of the fan assembly is unqualified, and if the M is smaller than or equal to the A, the life design of the fan assembly is qualified.
Optionally, in the step 6, the preset time is 6 hours.
The invention has the following advantages: in the product development stage, the temperature of the operating environment of the carbon brush of the brushed fan assembly is tested, the actual using conditions of a user are integrated, and the service life of the brushed fan assembly is evaluated to judge whether the design requirement is met.
Drawings
FIG. 1 is a flowchart of the present embodiment;
fig. 2 is a schematic temperature distribution diagram of the carbon brush structure in the present embodiment.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
As shown in fig. 1, a method for testing and calculating a lifetime of a brushed fan in this embodiment includes the following steps:
grouping the data, and calculating the annual operation time of the fan at different environmental temperatures according to basic data;
step 3, arranging a temperature sensor (see fig. 2, temperature distribution point 1 of carbon brush structure) on the carbon brush of the motor, measuring the initial size A of the carbon brush, assembling the carbon brush into the motor, finally assembling into a fan assembly, and numbering the fan assembly;
step 4, respectively placing each fan assembly in different high-temperature boxes, setting the temperature of the high-temperature boxes to different environmental temperatures, and setting the environmental temperatures according to the temperature collected in the step 1;
step 5, starting the fan assembly, continuously operating, and monitoring the temperature of the carbon brush;
step 6, continuously operating the fan assembly until the temperature of the carbon brush is stable and then operating for more than preset time (for example, 6 hours);
step 7, disassembling the motor, measuring the abrasion length of the carbon brush, and calculating the abrasion loss of the carbon brush per hour at the environmental temperature;
step 8, respectively calculating the abrasion loss of the carbon brush at different temperatures in the whole year according to the long running data of the fan at different temperatures counted by the actual vehicle;
step 9, accumulating the wear loss at different temperatures in the whole year to obtain the wear loss L of the carbon brush in the whole year;
step 10, multiplying the annual carbon brush abrasion loss by the design life of the vehicle to obtain the carbon brush abrasion loss M of the fan in the design life of the vehicle;
and 11, comparing the M with the initial size A of the carbon brush, wherein if the M is larger than or equal to the A, the life design of the fan assembly is unqualified, and if the M is smaller than or equal to the A, the life design of the fan assembly is qualified.
The present invention is described in detail below with reference to examples:
assuming that the annual operating time of the fan at different environmental temperatures obtained through the step 1 and the step 2 is as follows:
ambient temperature annual operating time
T1 t1
T2 t2
… …
Tm tm
In step 3, the carbon brushes of the m fan assemblies are initially sized A, and the m fan assemblies are numbered in sequence from 1.
In step 4, the m fan assemblies are respectively placed into the m high-temperature boxes, and if the number of the high-temperature boxes is not enough, the test can be carried out in batches. In this embodiment, m hot boxes are taken as an example, and the temperature at which the fan assembly numbered 1 is placed is set to T1, the temperature at which the fan assembly numbered 2 is placed is set to T2, and so on, and the temperature at which the fan assembly numbered m is placed is set to Tm.
In step 7, calculating the abrasion loss L1 of the carbon brush per hour of the fan assembly with the number of 1 at the temperature of T1; calculating the abrasion loss L2 of the carbon brush per hour under the temperature T2 of the fan assembly with the number 2; and analogizing in turn, calculating the abrasion quantity Lm of the carbon brush per hour under the temperature Tm of the fan assembly with the number m.
In step 8, the wear loss of the carbon brush at different temperatures throughout the year is calculated, specifically:
calculating the annual wear loss of the fan assembly with the number of 1 at the temperature of T1, namely L1 x T1;
calculating the annual wear loss of the fan assembly with the number 2 at the temperature of T2, namely L2 x T2;
by analogy, the annual wear loss of the fan assembly with the number m at the temperature Tm, namely Lm × Tm, is calculated.
In step 9, the carbon brush wear L of the whole year is calculated, specifically:
L=L1×t1+ L2×t2+……+Lm×tm。
in step 10, assuming that the vehicle design life is k years, M = L × k.
In step 11, comparing M with the initial size a of the carbon brush, it can be determined whether the life of the fan assembly meets the design requirement.
Claims (2)
1. A method for testing and calculating the service life of a brushed fan is characterized by comprising the following steps:
step 1, collecting basic data, and obtaining the corresponding relation between the actual running time of a fan and the ambient temperature of a sold vehicle through remote data statistical query;
grouping the data, and calculating the annual operation time of the fan at different environmental temperatures according to basic data;
step 3, arranging a temperature sensor on a carbon brush of the motor, measuring the initial size A of the carbon brush, assembling the carbon brush into the motor, finally assembling into a fan assembly, and numbering the fan assembly;
step 4, respectively placing each fan assembly in different high-temperature boxes, setting the temperature of the high-temperature boxes to different environmental temperatures, and setting the environmental temperatures according to the temperature collected in the step 1;
step 5, starting the fan assembly, continuously operating, and monitoring the temperature of the carbon brush;
step 6, continuously operating the fan assembly until the temperature of the carbon brush is stable and then operating for more than a preset time;
step 7, measuring the abrasion length of the carbon brush, and calculating the abrasion loss of the carbon brush per hour at the environmental temperature;
step 8, respectively calculating the abrasion loss of the carbon brush at different temperatures in the whole year according to the long running data of the fan at different temperatures counted by the actual vehicle;
step 9, accumulating the wear loss at different temperatures in the whole year to obtain the wear loss of the carbon brush in the whole year;
step 10, multiplying the annual carbon brush abrasion loss by the design service life of the vehicle to obtain the carbon brush abrasion loss M of the fan in the design service life of the vehicle;
and 11, comparing the M with the initial size A of the carbon brush, wherein if the M is larger than or equal to the A, the life design of the fan assembly is unqualified, and if the M is smaller than or equal to the A, the life design of the fan assembly is qualified.
2. The brushed fan life test calculation method of claim 1, wherein: in the step 6, the preset time is 6 hours.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110962325.8A CN113606177B (en) | 2021-08-20 | 2021-08-20 | Method for testing and calculating service life of brushed fan |
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| CN202110962325.8A CN113606177B (en) | 2021-08-20 | 2021-08-20 | Method for testing and calculating service life of brushed fan |
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| CN113606177B true CN113606177B (en) | 2022-07-08 |
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| CN114184405B (en) * | 2021-11-29 | 2023-06-16 | 重庆长安汽车股份有限公司 | Assessment method and system for thermal strain fatigue life of automobile radiator assembly |
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| KR20170030371A (en) * | 2015-09-09 | 2017-03-17 | 주식회사 에스텍 | System for moinitoring brush of generator |
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| CN109713852A (en) * | 2019-02-21 | 2019-05-03 | 芜湖杰诺瑞汽车电器系统有限公司 | A kind of low-loss automobile current generator of drop |
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| CN110707875A (en) * | 2019-11-01 | 2020-01-17 | 大唐陕西发电有限公司 | Real-time online monitoring system of carbon brush |
| CN113243063A (en) * | 2018-10-04 | 2021-08-10 | 科茨福斯有限公司 | System and method for monitoring the condition of one or more components of an electric machine |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101277163B1 (en) * | 2011-05-13 | 2013-06-19 | 가부시끼가이샤 도시바 | Apparatus for supplying voltage, rotation machine and method for supplying voltage |
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- 2021-08-20 CN CN202110962325.8A patent/CN113606177B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003051360A (en) * | 2001-08-08 | 2003-02-21 | Matsushita Electric Ind Co Ltd | Carbon brush, and commutator motor and electrical appliance using the same |
| KR20170030371A (en) * | 2015-09-09 | 2017-03-17 | 주식회사 에스텍 | System for moinitoring brush of generator |
| CN105337134A (en) * | 2015-12-01 | 2016-02-17 | 南京钢铁股份有限公司 | Direct-current motor carbon brush with service life capable of being checked |
| CN107329087A (en) * | 2017-09-05 | 2017-11-07 | 苏州绿控传动科技有限公司 | A kind of method of testing in quick detection brush motor life-span |
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| CN113243063A (en) * | 2018-10-04 | 2021-08-10 | 科茨福斯有限公司 | System and method for monitoring the condition of one or more components of an electric machine |
| CN109713852A (en) * | 2019-02-21 | 2019-05-03 | 芜湖杰诺瑞汽车电器系统有限公司 | A kind of low-loss automobile current generator of drop |
| CN110707875A (en) * | 2019-11-01 | 2020-01-17 | 大唐陕西发电有限公司 | Real-time online monitoring system of carbon brush |
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