CN107093885B - Short-circuit protection system and method for electric permanent magnetic chuck - Google Patents
Short-circuit protection system and method for electric permanent magnetic chuck Download PDFInfo
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- CN107093885B CN107093885B CN201610493491.7A CN201610493491A CN107093885B CN 107093885 B CN107093885 B CN 107093885B CN 201610493491 A CN201610493491 A CN 201610493491A CN 107093885 B CN107093885 B CN 107093885B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/087—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for DC applications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
- H02H3/042—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned combined with means for locating the fault
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Abstract
The invention discloses a short-circuit protection system and a short-circuit protection method for an electric permanent magnetic chuck, wherein the system comprises: the current sensor is connected with the excitation coil of the electric permanent magnetic chuck; a silicon controlled rectifier circuit connected with the current sensor; and the controller is connected with the silicon controlled rectifier circuit, the current sensor and the excitation coil, triggers the silicon controlled rectifier circuit to output a first preset voltage before the excitation coil is charged and demagnetized, receives a first current in the excitation coil acquired by the current sensor in real time, judges the short circuit of the excitation coil of the electric permanent magnetic chuck when the first current is greater than a preset current threshold value, and stops the triggering of the silicon controlled rectifier circuit. The resistance of the load excitation coil is accurately judged before each magnetizing and demagnetizing, and if the excitation coil is abnormal, the trigger of excitation current is stopped, so that the short-circuit condition is protected in advance, the short-circuit condition is prevented, and the running safety and reliability of the electric permanent magnetic chuck are improved.
Description
Technical Field
The invention relates to the technical field of an electric permanent magnet controller, in particular to a short-circuit protection system and method for an electric permanent magnet sucker.
Background
The electric permanent magnetic chuck is widely applied to the machinery manufacturing industry as an economic and environment-friendly clamping device, particularly used as a processing clamp for metal cutting, and is suitable for application of a common machine tool and a processing center.
Suction cups based on the electromagnet principle are now standard for many machine tools. The distribution of the magnetic circuits in the permanent magnet magnetic field is controlled and converted by an electric control system by utilizing different characteristics of different permanent magnet materials, so that the permanent magnet magnetic field is self-balanced in the system and externally characterized as a demagnetizing relaxation state, namely a non-material-absorbing state, or released to a working magnetic pole surface of an electro-permanent magnet and externally characterized as a magnetizing clamping state, namely a material-absorbing state. Because the electrifying time of the electric permanent magnet coil is extremely short, the electric permanent magnet coil has the advantages of energy conservation, environmental protection and the like. However, when the current electric permanent magnetic chuck is in operation, the electric permanent magnetic chuck and the connecting line are prevented from short-circuiting only by the breaker and other products, and the fault cannot be judged and processed in advance, and when the short-circuiting fault occurs, the safety accident cannot be avoided by processing through the breaker and other products.
Therefore, how to improve the operation safety of the operation of the electric permanent magnetic chuck is a technical problem to be solved by those skilled in the art at present.
Disclosure of Invention
The invention aims to provide a short-circuit protection system and a short-circuit protection method for an electric permanent magnetic chuck, which can judge and control the short-circuit condition of the electric permanent magnetic chuck in advance and effectively improve the operation safety of the electric permanent magnetic chuck.
In order to solve the technical problems, the invention provides the following technical scheme:
an electro permanent magnetic chuck short circuit protection system comprising:
the current sensor is connected with the excitation coil of the electric permanent magnetic chuck;
the silicon controlled rectifier circuit is connected with the current sensor;
with silicon controlled rectifier circuit current sensor and excitation coil connect before the action of excitation coil magnetization and demagnetization, trigger silicon controlled rectifier circuit exports first predetermined voltage to receive in real time current sensor gathers first electric current in the excitation coil judge when first electric current is greater than predetermined current threshold the excitation coil short circuit of electricity permanent magnetism sucking disc, and stop silicon controlled rectifier circuit's the controller of triggering.
Preferably, the magnetic circuit further comprises a first relay circuit and a second relay circuit connected with the controller, wherein the first relay circuit and the second relay circuit are used for responding to a control signal of the controller to perform magnetization and demagnetization on the excitation coil; the current sensor is connected with the first end of the excitation coil, the second relay circuit is connected with the silicon controlled rectifier rectifying circuit, and the second end of the excitation coil is connected with the controller through the first relay circuit.
Preferably, the first preset voltage has a value not greater than 5V.
Preferably, the controller is an STM32 single chip microcomputer.
Preferably, the controller is provided with a trigger test current time control module for controlling the time for triggering the silicon controlled rectifier circuit to output the first preset voltage to be not more than 10 ms.
Preferably, the electric permanent magnetic chuck further comprises an alarm module connected with the controller and used for giving an alarm when the controller judges that the magnet exciting coil of the electric permanent magnetic chuck is short-circuited.
A short-circuit protection method for an electric permanent magnetic chuck comprises the following steps:
before magnetizing and demagnetizing an excitation coil of the electric permanent magnetic chuck, outputting a first preset voltage to the excitation coil;
collecting a first current output by the excitation coil under the first preset voltage;
judging whether the first current is larger than a preset current threshold value or not;
and if so, judging that the excitation coil is short-circuited.
Preferably, the outputting of the first preset voltage to the exciting coil is specifically outputting a voltage with a voltage value not greater than 5V to the exciting coil.
Preferably, the method further comprises the following steps:
judging whether the time length of outputting a first preset voltage to the excitation coil is more than 10 ms;
and if so, stopping outputting the first preset voltage to the excitation coil.
Compared with the prior art, the technical scheme has the following advantages:
the short-circuit protection system for the electric permanent magnetic chuck provided by the embodiment of the invention comprises: the current sensor is connected with the excitation coil of the electric permanent magnetic chuck; a silicon controlled rectifier circuit connected with the current sensor; and the controller is connected with the silicon controlled rectifier circuit, the current sensor and the excitation coil, triggers the silicon controlled rectifier circuit to output a first preset voltage before the excitation coil is charged and demagnetized, receives a first current in the excitation coil acquired by the current sensor in real time, judges the short circuit of the excitation coil of the electric permanent magnetic chuck when the first current is greater than a preset current threshold value, and stops the triggering of the silicon controlled rectifier circuit. The controller triggers the silicon controlled rectifier rectifying circuit to output a voltage before the magnetizing coil is magnetized and demagnetized, the voltage passes through the load magnetizing coil, then the controller collects the current in the magnetizing coil through the current sensor, when the first current is larger than a preset current threshold value, the load magnetizing coil is judged to be short-circuited, namely, the resistance of the load magnetizing coil is accurately judged before the magnetizing and demagnetizing at each time, if the magnetizing coil is abnormal, the triggering of the exciting current is stopped, the short-circuit condition is protected in advance, and the short-circuit condition is prevented.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an electrical permanent magnetic chuck short-circuit protection system according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of an electro-permanent magnetic chuck short-circuit protection system according to another embodiment of the present invention;
fig. 3 is a flowchart of a short-circuit protection method for an electro-permanent magnetic chuck according to an embodiment of the present invention.
Detailed Description
The core of the invention is to provide a short-circuit protection system and a short-circuit protection method for an electric permanent magnetic chuck, which can judge and control the short-circuit condition of the electric permanent magnetic chuck in advance and effectively improve the operation safety of the electric permanent magnetic chuck.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
In the following description, specific details are set forth in order to provide a thorough understanding of the present invention. The invention can be implemented in a number of ways different from those described herein and similar generalizations can be made by those skilled in the art without departing from the spirit of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an electric permanent magnetic chuck short-circuit protection system according to an embodiment of the present invention.
One embodiment of the present invention provides an electric permanent magnetic chuck short circuit protection system, comprising: the current sensor 2 is connected with the excitation coil 1 of the electric permanent magnetic chuck; a silicon controlled rectifier circuit 3 connected to the current sensor 2; and the controller 4 is connected with the silicon controlled rectifier circuit 3, the current sensor 2 and the excitation coil 1, triggers the silicon controlled rectifier circuit 3 to output a first preset voltage before the excitation coil 1 performs magnetizing and demagnetizing actions, receives a first current in the excitation coil 1 acquired by the current sensor 2 in real time, judges that the excitation coil of the electric permanent magnetic chuck is in short circuit when the first current is greater than a preset current threshold value, and stops triggering of the silicon controlled rectifier circuit.
The inventor researches and discovers that a control system of the existing electric permanent magnetic chuck does not have real short-circuit protection, or whether faults such as short circuit occur in the electric permanent magnetic chuck and a connecting line or not is prevented by products such as a circuit breaker, and the like.
In the embodiment, the controller triggers the silicon controlled rectifier rectification circuit to output a voltage to pass through the load excitation coil before the excitation coil is magnetized and demagnetized, then the controller collects the current in the excitation coil through the current sensor, and when the collected first current is larger than a preset current threshold value, the load excitation coil is judged to be short-circuited. The comparison of the first current and the preset current threshold value is carried out, namely, the resistance of the load excitation coil is accurately judged before each time of magnetization and demagnetization, if the first current is too large, the resistance of the load excitation coil is represented to be abnormal, a short-circuit condition occurs, and if the excitation coil is abnormal, the excitation current is stopped to be triggered, so that the short-circuit condition is protected in advance, and the short-circuit condition is prevented. Therefore, the short circuit condition of the electric permanent magnetic chuck is judged and controlled in advance, and the operation safety of the electric permanent magnetic chuck can be effectively improved.
Referring to fig. 2, fig. 2 is a schematic circuit structure diagram of an electric permanent magnetic chuck short-circuit protection system according to another embodiment of the present invention.
In one embodiment of the invention, the system comprises a first relay circuit 5 and a second relay circuit 6 which are connected with the controller 4 besides the current sensor 2, the silicon controlled rectifier circuit 3 and the controller 4, wherein the first relay circuit 5 and the second relay circuit 6 are used for responding to a control signal of the controller 4 to carry out magnetization and demagnetization on the excitation coil 1; the current sensor 2 is connected with a first end P-1 of an excitation coil 1 (not shown in the figure), the second relay circuit 6 is connected with the silicon controlled rectifier circuit 3, and a second end P +1 of the excitation coil 1 is connected with the controller 4 through the first relay circuit 5.
Wherein the first relay circuit and the second relay circuit function as a drive circuit. The controller switches by controlling the contacts of the first relay circuit and the second relay circuit so as to control the magnetization and demagnetization of the excitation coil. Therefore, because the controller controls the two sets of relay circuits to perform magnetization and demagnetization control, the thyristor rectification circuit can be accurately controlled to output the first preset voltage before the magnetization and demagnetization actions, and in order to prevent the device damage caused by overlarge detection current in the circuit in the whole system, the first preset voltage is not suitable to be overlarge, and the value of the first preset voltage is not more than 5V in the embodiment. Further, the controller is STM32 singlechip, and this singlechip embeds has analog-to-digital converter, can realize the accurate measurement and the conversion to real-time electric current to measure electric current's size, and compare with predetermineeing the current threshold value. The preset current threshold is set according to actual conditions, and may be a minimum allowable value obtained by a worker according to a short circuit test and the like.
On the basis of the above embodiment, in an embodiment of the present invention, the controller is provided with a trigger test current time control module, which is used for controlling the time for triggering the silicon controlled rectifier circuit to output the first preset voltage to be not more than 10 ms. In the present embodiment, the time for controlling the trigger detection is controlled within 10ms, and the short trigger detection time is ensured, so that the magnetization and demagnetization time is not increased.
Furthermore, the system also comprises an alarm module connected with the controller, and the alarm module is used for giving an alarm when the controller judges that the magnet exciting coil of the electric permanent magnet sucker is short-circuited so as to inform a worker to overhaul and ensure the reliability of the operation of the system.
Referring to fig. 3, fig. 3 is a flowchart illustrating a short-circuit protection method for an electric permanent magnetic chuck according to an embodiment of the present invention.
Correspondingly, an embodiment of the present invention further provides a short-circuit protection method for an electric permanent magnetic chuck, including:
s11: before magnetizing and demagnetizing the excitation coil of the electric permanent magnetic chuck, a first preset voltage is output to the excitation coil. Preferably, the outputting of the first preset voltage to the exciting coil is specifically outputting a voltage with a voltage value of not more than 5V to the exciting coil.
S12: collecting a first current output by an excitation coil under a first preset voltage;
s13: judging whether the first current is larger than a preset current threshold value or not;
s14: if yes, the short circuit of the excitation coil is judged.
Before the magnetizing and demagnetizing actions of the exciting coil, outputting a low voltage to pass through the load exciting coil, then collecting the current in the exciting coil, and judging that the load exciting coil is short-circuited when the collected first current is greater than a preset current threshold value. The comparison of the first current and the preset current threshold value is carried out, namely, the resistance of the load excitation coil is accurately judged before each time of magnetization and demagnetization, if the first current is too large, the resistance of the load excitation coil is represented to be abnormal, a short-circuit condition occurs, and if the excitation coil is abnormal, the excitation current is stopped to be triggered, so that the short-circuit condition is protected in advance, and the short-circuit condition is prevented. Therefore, the short circuit condition of the electric permanent magnetic chuck is judged and controlled in advance, and the operation safety of the electric permanent magnetic chuck can be effectively improved.
Further, the method further comprises: judging whether the time length of outputting the first preset voltage to the excitation coil is more than 10 ms; if so, stopping outputting the first preset voltage to the exciting coil. The time for controlling the trigger detection is controlled within 10ms, so that the short trigger detection time is ensured, and the magnetizing and demagnetizing time cannot be prolonged.
In summary, the system and method for protecting short circuit of an electric permanent magnetic chuck according to the present invention output a low voltage to pass through a load exciting coil before the magnetizing and demagnetizing actions of the exciting coil, collect a current in the exciting coil, and determine that the load exciting coil is short-circuited when a first collected current is greater than a preset current threshold. The comparison of the first current and the preset current threshold value is carried out, namely, the resistance of the load excitation coil is accurately judged before each time of magnetization and demagnetization, if the first current is too large, the resistance of the load excitation coil is represented to be abnormal, a short-circuit condition occurs, and if the excitation coil is abnormal, the excitation current is stopped to be triggered, so that the short-circuit condition is protected in advance, and the short-circuit condition is prevented. Therefore, the short circuit condition of the electric permanent magnetic chuck is judged and controlled in advance, and the operation safety of the electric permanent magnetic chuck can be effectively improved.
The short-circuit protection system and method for the electro-permanent magnetic chuck provided by the invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the present invention and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (9)
1. An electro-permanent magnetic chuck short circuit protection system, comprising:
the current sensor is connected with the excitation coil of the electric permanent magnetic chuck;
the silicon controlled rectifier circuit is connected with the current sensor;
with silicon controlled rectifier circuit current sensor and excitation coil connect before the action of excitation coil magnetization and demagnetization, trigger silicon controlled rectifier circuit exports first predetermined voltage to receive in real time current sensor gathers first electric current in the excitation coil judge when first electric current is greater than predetermined current threshold the excitation coil short circuit of electricity permanent magnetism sucking disc, and stop silicon controlled rectifier circuit's the controller of triggering.
2. The system of claim 1, further comprising a first relay circuit and a second relay circuit coupled to the controller, the first relay circuit and the second relay circuit being configured to magnetize and demagnetize the field coil in response to a control signal from the controller; the current sensor is connected with the first end of the excitation coil, the second relay circuit is connected with the silicon controlled rectifier rectifying circuit, and the second end of the excitation coil is connected with the controller through the first relay circuit.
3. The system of claim 2, wherein the first predetermined voltage has a value of no more than 5V.
4. The system of claim 3, wherein the controller is an STM32 single chip microcomputer.
5. The system according to any one of claims 1 to 4, wherein a trigger test current time control module is arranged in the controller and is used for controlling the time for triggering the silicon controlled rectifier circuit to output the first preset voltage to be not more than 10 ms.
6. The system of claim 5, further comprising an alarm module coupled to the controller for alarming when the controller determines that the field coil of the electric permanent magnet chuck is shorted.
7. An electro permanent magnetic chuck short circuit protection method, applied to the electro permanent magnetic chuck short circuit protection system of claim 1, comprising:
before magnetizing and demagnetizing an excitation coil of the electric permanent magnetic chuck, outputting a first preset voltage to the excitation coil;
collecting a first current output by the excitation coil under the first preset voltage;
judging whether the first current is larger than a preset current threshold value or not;
and if so, judging that the excitation coil is short-circuited.
8. The method according to claim 7, wherein the outputting the first preset voltage to the exciting coil is outputting a voltage with a voltage value not greater than 5V to the exciting coil.
9. The method of claim 7 or 8, further comprising:
judging whether the time length of outputting a first preset voltage to the excitation coil is more than 10 ms;
and if so, stopping outputting the first preset voltage to the excitation coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610493491.7A CN107093885B (en) | 2016-06-29 | 2016-06-29 | Short-circuit protection system and method for electric permanent magnetic chuck |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610493491.7A CN107093885B (en) | 2016-06-29 | 2016-06-29 | Short-circuit protection system and method for electric permanent magnetic chuck |
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| Publication Number | Publication Date |
|---|---|
| CN107093885A CN107093885A (en) | 2017-08-25 |
| CN107093885B true CN107093885B (en) | 2020-02-07 |
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| CN201610493491.7A Active CN107093885B (en) | 2016-06-29 | 2016-06-29 | Short-circuit protection system and method for electric permanent magnetic chuck |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114373288B (en) * | 2022-01-19 | 2024-01-26 | 湖南理工职业技术学院 | A short circuit alarm device for circuit maintenance of electromechanical equipment |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201285684Y (en) * | 2008-10-20 | 2009-08-05 | 美恒自动化(大连)有限公司 | DC electromagnet control apparatus |
| CN201796672U (en) * | 2010-08-17 | 2011-04-13 | 南通茂业电子科技有限公司 | Intelligent constant current magnetization and demagnetization control device for electro-permanent magnetic chuck |
| CN205318958U (en) * | 2016-01-20 | 2016-06-15 | 潍坊市鹏大电子科技有限公司 | Electric permanent magnetic sucking disc controller |
| CN205911733U (en) * | 2016-06-29 | 2017-01-25 | 株洲悍威磁电科技有限公司 | Electricity permanent -magnetic chuck short circuit protecting system |
-
2016
- 2016-06-29 CN CN201610493491.7A patent/CN107093885B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201285684Y (en) * | 2008-10-20 | 2009-08-05 | 美恒自动化(大连)有限公司 | DC electromagnet control apparatus |
| CN201796672U (en) * | 2010-08-17 | 2011-04-13 | 南通茂业电子科技有限公司 | Intelligent constant current magnetization and demagnetization control device for electro-permanent magnetic chuck |
| CN205318958U (en) * | 2016-01-20 | 2016-06-15 | 潍坊市鹏大电子科技有限公司 | Electric permanent magnetic sucking disc controller |
| CN205911733U (en) * | 2016-06-29 | 2017-01-25 | 株洲悍威磁电科技有限公司 | Electricity permanent -magnetic chuck short circuit protecting system |
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| CN107093885A (en) | 2017-08-25 |
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