CN103326321B - A kind of motor undervoltage protection method - Google Patents
A kind of motor undervoltage protection method Download PDFInfo
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- CN103326321B CN103326321B CN201310229156.2A CN201310229156A CN103326321B CN 103326321 B CN103326321 B CN 103326321B CN 201310229156 A CN201310229156 A CN 201310229156A CN 103326321 B CN103326321 B CN 103326321B
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- voltage
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- load
- bar voltage
- motor
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Abstract
The invention discloses a kind of motor undervoltage protection method, it comprises the following steps: (1) sets minimum specified busbar voltage as under-voltage fiducial value；(2) Real-time Collection DC bus-bar voltage, it is judged that whether DC bus-bar voltage is less than minimum specified busbar voltage；(3) if DC bus-bar voltage is more than minimum specified busbar voltage, step (2) is continued；If DC bus-bar voltage is less than minimum specified busbar voltage, continue step (4)；(4) judge whether DC bus-bar voltage matches with load, if DC bus-bar voltage matches with load, then continue step (2), if DC bus-bar voltage does not mates with load, then continue step (5)；(5) protection act, stops motor and runs, until human intervention；The practical operation situation of under-voltage protection and load is come together to consider actual under-voltage protection by the method for the present invention, gets rid of the under-voltage protection not conformed to the actual conditions in motor operation course, thus the operational efficiency of motor is greatly improved.
Description
Technical field
The present invention relates to a kind of motor undervoltage protection method.
Background technology
Due to reasons such as short troubles, line voltage distribution can occur at short notice being greatly lowered and even disappears
Phenomenon.It can bring damage to circuit and electric equipment.Such as: make motor tired fall, stall, thus produce
The raw overcurrent being several times as much as rated current, burns out motor；When voltage recovers, a large amount of motor from
Moving to make again the voltage of motor significantly decline, and works the mischief.
Under-voltage protection currently for motor has multiple method, but is the most all with reference to an a reference value, is less than
This value then produces protection act.Then affecting under-voltage many factors in electrical network, some low-voltage is for load
For be not a dangerous thing, therefore, need to set up on bottom line to the protection of motor, no
Then will be substantially reduced the service efficiency of motor.
Summary of the invention
It is under-voltage that the technical problem to be solved is to provide a kind of motor meeting motor practical operation situation
Guard method.
In order to solve above-mentioned technical problem, the technical scheme is that a kind of motor undervoltage protection method,
It is characterized in that comprising the following steps:
(1) minimum specified busbar voltage is set, using minimum specified busbar voltage as under-voltage fiducial value；
(2) Real-time Collection DC bus-bar voltage, it is judged that whether DC bus-bar voltage is less than minimum specified bus electricity
Pressure；
(3) if DC bus-bar voltage is more than minimum specified busbar voltage, step (2) is continued；If direct current is female
When line voltage is less than minimum specified busbar voltage, continue step (4)；
(4) judge whether DC bus-bar voltage matches with load, if DC bus-bar voltage matches with load,
Then continue step (2), if DC bus-bar voltage does not mates with load, then continue step (5)；
(5) protection act, stops motor and runs, until human intervention.
The specified busbar voltage of described minimum is the minimum of a value of the range of nominal tension.
Judging whether DC bus-bar voltage matches with load according to P=UI, P is actual power, and U, I divide
Wei real-time voltage and electric current.
The practical operation situation of under-voltage protection and load is come together to consider reality by the method for the present invention
Under-voltage protection, thus get rid of the under-voltage protection not conformed to the actual conditions in motor operation course, thus electricity is greatly improved
The operational efficiency of machine.
Detailed description of the invention
(1) minimum specified busbar voltage 200V is set, using minimum specified busbar voltage as under-voltage fiducial value；
The purpose of this step is to try to reduce erroneous judgement.Because rated voltage is a scope, such as normal voltage
220V, rated voltage can be by the range of ± 10%, i.e. 200-240V, if not with minimum specified busbar voltage
200V is as reference point, when 210V, again smaller than 240V, the most very likely causes erroneous judgement.
(2) Real-time Collection DC bus-bar voltage, it is judged that whether DC bus-bar voltage is less than minimum specified bus electricity
Pressure 200V；
(3) if DC bus-bar voltage is more than minimum specified busbar voltage 200V, step (2) is continued；If
When DC bus-bar voltage is less than minimum specified busbar voltage 200V, continue step (4)；
(4) judge whether DC bus-bar voltage matches with load, if DC bus-bar voltage matches with load,
Then continue step (2), if DC bus-bar voltage does not mates with load, then continue step (5)；Basis for estimation
Judging whether DC bus-bar voltage matches with load according to P=UI, P is actual power, and U, I are respectively
Real-time voltage and electric current.Actual power P drawn compares just may determine that whether mate with the power of load
(i.e. overload).
(5) protection act, stops motor and runs, until human intervention.The purpose of this step is to prevent voltage
After Zheng Chang, motor resumes operation automatically, now will produce uncertain factor, particularly some hazards,
Accordingly, it would be desirable to manually restart.In the process, can be according to Real-time Collection DC bus-bar voltage
Data are come to the most normal signal of an extraneous voltage, and human intervention performs accordingly.
Above-described embodiment limits the present invention, every employing equivalent or the side of equivalent transformation never in any form
The technical scheme that formula obtains all falls within protection scope of the present invention.
Claims (2)
1. a motor undervoltage protection method, it is characterised in that comprise the following steps:
(1) minimum specified busbar voltage is set, using minimum specified busbar voltage as under-voltage fiducial value；
(2) Real-time Collection DC bus-bar voltage, it is judged that whether DC bus-bar voltage is less than minimum specified busbar voltage；
(3) if DC bus-bar voltage is more than minimum specified busbar voltage, step (2) is continued；If DC bus-bar voltage is less than minimum specified busbar voltage, continue step (4)；
(4) judge whether DC bus-bar voltage matches with load, if DC bus-bar voltage matches with load, then continue step (2), if DC bus-bar voltage does not mates with load, then continue step (5)；Wherein, judging whether DC bus-bar voltage matches with load according to P=UI, P is actual power, and U, I are respectively real-time voltage and electric current, and actual power P drawn compares just can interpolate that out whether mate with the power of load；
(5) protection act, stops motor and runs, until human intervention.
A kind of motor undervoltage protection method the most according to claim 1, it is characterised in that: the specified busbar voltage of described minimum is the minimum of a value of the range of nominal tension.
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 CN103326321A (en) | 2013-09-25 |
| CN103326321B true CN103326321B (en) | 2016-09-07 |
Family
ID=49194927
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 |
|---|---|
| CN (1) | CN103326321B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| 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 |
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 |
|---|
| 接触器对电动机欠压保护的探讨;陈昌奎;《电气时代》;20040131(第1期);64-66 * |
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| Publication number | Publication date |
|---|---|
| CN103326321A (en) | 2013-09-25 |
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| 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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| COR | Change of bibliographic data | ||
| 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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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160907 |