CN103326321A - Motor undervoltage protection method - Google Patents
Motor undervoltage protection method Download PDFInfo
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- CN103326321A CN103326321A CN2013102291562A CN201310229156A CN103326321A CN 103326321 A CN103326321 A CN 103326321A CN 2013102291562 A CN2013102291562 A CN 2013102291562A CN 201310229156 A CN201310229156 A CN 201310229156A CN 103326321 A CN103326321 A CN 103326321A
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- voltage
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- motor
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Abstract
The invention discloses a motor undervoltage protection method which comprises the following steps that (1) the minimum rated bus voltage is set to serve as an undervoltage comparison value; (2) direct current bus voltage is collected in real time, and whether the direct current bus voltage is smaller than the minimum rated bus voltage or not is judged; (3) if the direct current bus voltage is larger than the minimum rated bus voltage, the step (2) is continued; if the direct current bus voltage is smaller than the minimum rated bus voltage, a step (4) is continued; (4) whether the direct current bus voltage is matched with a load or not is judged, the step (2) is continued if the direct current bus voltage is matched with the load, and if the direct current bus voltage is not matched with the load, a step (5) is continued; (5) protective action is carried out, motor operation is stopped until human intervention. According to the motor undervoltage protection method, actual undervoltage protection is considered through combination of actual operating conditions of the undervoltage protection and the load, the undervoltage protection unmatched with reality in the motor operating process is eliminated, and therefore operating efficiency of a motor is substantially improved.
Description
Technical field
The present invention relates to a kind of motor low-voltage protection method.
Background technology
Owing to reasons such as short troubles, the phenomenon of decrease even disappearance can appear in line voltage distribution at short notice.It can bring damage to circuit and electric equipment.For example: make that motor tiredly falls, stall, thereby produce the overcurrent that is several times as much as rated current, burn out motor; When voltage recovered, the self-starting of a large amount of motor can make again the voltage of motor significantly descend, and works the mischief.
The at present under-voltage protection for motor has several different methods, but all is with reference to a fiducial value basically, is lower than this value and then produces the protection action.Then the under-voltage many factors of impact in the electrical network, some low-voltage is not the thing of a danger for load, therefore, need to be based upon on the bottom line the protection of motor, otherwise will greatly reduce the service efficiency of motor.
Summary of the invention
Technical problem to be solved by this invention provides a kind of motor low-voltage protection method that meets the motor practical operation situation.
In order to solve the problems of the technologies described above, technical scheme of the present invention is: a kind of motor low-voltage protection method is characterized in that may further comprise the steps:
(1) set minimum specified busbar voltage, with the specified busbar voltage of minimum as under-voltage comparison value;
(2) Real-time Collection DC bus-bar voltage judges that whether DC bus-bar voltage is less than the specified busbar voltage of minimum;
(3) if DC bus-bar voltage during greater than the specified busbar voltage of minimum, continues step (2); If DC bus-bar voltage during less than the specified busbar voltage of minimum, continues step (4);
(4) judge whether DC bus-bar voltage is complementary with load, if DC bus-bar voltage and load are complementary, then continue step (2), if DC bus-bar voltage and load are not mated, then continue step (5);
(5) protection action stops the motor operation, until human intervention.
The specified busbar voltage of described minimum is the minimum value of the range of nominal tension.
Judge according to P=UI whether DC bus-bar voltage is complementary with load, and P is actual power, and U, I are respectively real-time voltage and electric current.
Method of the present invention combines to consider actual under-voltage protection with the practical operation situation of under-voltage protection and load, thereby gets rid of the under-voltage protection that does not conform to the actual conditions in the motor operation course, thereby significantly improves the operational efficiency of motor.
Embodiment
(1) set minimum specified busbar voltage 200V, with the specified busbar voltage of minimum as under-voltage comparison value; The purpose of this step is to reduce erroneous judgement as far as possible.Because rated voltage is a scope, for example normal voltage is 220V, and rated voltage can be with in ± 10% scope, i.e. 200-240V, if not with the specified busbar voltage 200V of minimum as reference point, when 210V, also less than 240V, so very likely cause erroneous judgement.
(2) Real-time Collection DC bus-bar voltage judges that whether DC bus-bar voltage is less than the specified busbar voltage 200V of minimum;
(3) if DC bus-bar voltage during greater than the specified busbar voltage 200V of minimum, continues step (2); If DC bus-bar voltage during less than the specified busbar voltage 200V of minimum, continues step (4);
(4) judge whether DC bus-bar voltage is complementary with load, if DC bus-bar voltage and load are complementary, then continue step (2), if DC bus-bar voltage and load are not mated, then continue step (5); Basis for estimation judges according to P=UI whether DC bus-bar voltage is complementary with load, and P is actual power, and U, I are respectively real-time voltage and electric current.The actual power P that draws and the power ratio of load more just can judge whether mate (i.e. overload).
(5) protection action stops the motor operation, until human intervention.The purpose of this step is that motor resumes operation automatically after preventing that voltage is normal, and will produce uncertain factor this moment, and particularly therefore some hazards, need to manually restart.In this process, can come to an extraneous voltage normal signal whether according to the data of Real-time Collection DC bus-bar voltage, human intervention is carried out accordingly.
Above-described embodiment does not limit the present invention in any way, and every employing is equal to replaces or technical scheme that the mode of equivalent transformation obtains all drops in protection scope of the present invention.
Claims (3)
1. motor low-voltage protection method is characterized in that may further comprise the steps:
(1) set minimum specified busbar voltage, with the specified busbar voltage of minimum as under-voltage comparison value;
(2) Real-time Collection DC bus-bar voltage judges that whether DC bus-bar voltage is less than the specified busbar voltage of minimum;
(3) if DC bus-bar voltage during greater than the specified busbar voltage of minimum, continues step (2); If DC bus-bar voltage during less than the specified busbar voltage of minimum, continues step (4);
(4) judge whether DC bus-bar voltage is complementary with load, if DC bus-bar voltage and load are complementary, then continue step (2), if DC bus-bar voltage and load are not mated, then continue step (5);
(5) protection action stops the motor operation, until human intervention.
2. a kind of motor low-voltage protection method according to claim 1, it is characterized in that: the specified busbar voltage of described minimum is the minimum value of the range of nominal tension.
3. a kind of motor low-voltage protection method according to claim 1 is characterized in that: judge according to P=UI whether DC bus-bar voltage is complementary with load, and P is actual power, and U, I are respectively real-time voltage and electric current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310229156.2A CN103326321B (en) | 2013-06-09 | 2013-06-09 | A kind of motor undervoltage protection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310229156.2A CN103326321B (en) | 2013-06-09 | 2013-06-09 | A kind of motor undervoltage protection method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103326321A true CN103326321A (en) | 2013-09-25 |
| CN103326321B CN103326321B (en) | 2016-09-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310229156.2A Expired - Fee Related CN103326321B (en) | 2013-06-09 | 2013-06-09 | A kind of motor undervoltage protection method |
Country Status (1)
| Country | Link |
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| CN (1) | CN103326321B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106786617A (en) * | 2015-11-19 | 2017-05-31 | 中国石油化工股份有限公司 | A kind of motor low voltage protection method and device |
| CN110173834A (en) * | 2019-05-10 | 2019-08-27 | 广东美的制冷设备有限公司 | Control method, device and the air conditioner of air conditioner |
| CN111953259A (en) * | 2020-08-13 | 2020-11-17 | 成都卡诺普自动化控制技术有限公司 | Dynamic bus under-voltage protection method applied to driving and controlling all-in-one machine of robot |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5596471A (en) * | 1995-05-05 | 1997-01-21 | Advanced Micro Devices, Inc. | Adjustable undervoltage trip fault interrupt circuit |
| CN101714752A (en) * | 2008-10-06 | 2010-05-26 | 鸿富锦精密工业（深圳）有限公司 | Overvoltage and undervoltage protection system |
-
2013
- 2013-06-09 CN CN201310229156.2A patent/CN103326321B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5596471A (en) * | 1995-05-05 | 1997-01-21 | Advanced Micro Devices, Inc. | Adjustable undervoltage trip fault interrupt circuit |
| CN101714752A (en) * | 2008-10-06 | 2010-05-26 | 鸿富锦精密工业（深圳）有限公司 | Overvoltage and undervoltage protection system |
Non-Patent Citations (1)
| Title |
|---|
| 陈昌奎: "接触器对电动机欠压保护的探讨", 《电气时代》, no. 1, 31 January 2004 (2004-01-31), pages 64 - 66 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106786617A (en) * | 2015-11-19 | 2017-05-31 | 中国石油化工股份有限公司 | A kind of motor low voltage protection method and device |
| CN106786617B (en) * | 2015-11-19 | 2019-04-12 | 中国石油化工股份有限公司 | A kind of motor low voltage protection method and device |
| CN110173834A (en) * | 2019-05-10 | 2019-08-27 | 广东美的制冷设备有限公司 | Control method, device and the air conditioner of air conditioner |
| CN110173834B (en) * | 2019-05-10 | 2021-04-20 | 广东美的制冷设备有限公司 | Control method and device of air conditioner and air conditioner |
| CN111953259A (en) * | 2020-08-13 | 2020-11-17 | 成都卡诺普自动化控制技术有限公司 | Dynamic bus under-voltage protection method applied to driving and controlling all-in-one machine of robot |
| CN111953259B (en) * | 2020-08-13 | 2021-06-01 | 成都卡诺普自动化控制技术有限公司 | Dynamic bus under-voltage protection method applied to driving and controlling all-in-one machine of robot |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103326321B (en) | 2016-09-07 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| CB03 | Change of inventor or designer information |
Inventor after: Qian Guochu Inventor before: Chu Zhenjiang |
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| TA01 | Transfer of patent application right |
Effective date of registration: 20160425 Address after: 201800 No. 501 Cao Cao Road, Cao Shi, Shanghai, Jiading District Applicant after: Qian Guochu Address before: 215500, Suzhou, Jiangsu province Changshou City Lake Town Wang Zhuang strong North Road, No. 118 Applicant before: CHANGSHU JIUZHOU ELECTRIC EQUIPMENT CO.,LTD. |
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Granted publication date: 20160907 |
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| CF01 | Termination of patent right due to non-payment of annual fee |