CN112122999A - Motor protection system and method - Google Patents
Motor protection system and method Download PDFInfo
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- CN112122999A CN112122999A CN202010998404.XA CN202010998404A CN112122999A CN 112122999 A CN112122999 A CN 112122999A CN 202010998404 A CN202010998404 A CN 202010998404A CN 112122999 A CN112122999 A CN 112122999A
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- 238000000034 method Methods 0.000 title claims abstract description 58
- 238000005070 sampling Methods 0.000 claims abstract description 16
- 230000009471 action Effects 0.000 claims description 24
- 239000003990 capacitor Substances 0.000 claims description 16
- 238000004891 communication Methods 0.000 claims description 15
- 230000010354 integration Effects 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 238000011217 control strategy Methods 0.000 claims description 6
- 238000003860 storage Methods 0.000 claims description 6
- 238000004590 computer program Methods 0.000 claims description 5
- 230000002159 abnormal effect Effects 0.000 abstract description 9
- 238000003754 machining Methods 0.000 abstract description 6
- 238000012544 monitoring process Methods 0.000 abstract description 3
- 230000008569 process Effects 0.000 description 12
- 238000010586 diagram Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 4
- 230000006870 function Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/0833—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors for electric motors with control arrangements
- H02H7/0844—Fail safe control, e.g. by comparing control signal and controlled current, isolating motor on commutation error
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Abstract
The application relates to a motor protection system and a method, wherein the method comprises the following steps: acquiring a voltage signal obtained by sampling a main shaft of a motor; obtaining current numerical value information corresponding to the spindle current of the motor according to the voltage signal; and starting a protection strategy corresponding to the motor when the current numerical value information exceeds a preset current upper limit threshold value. The above-mentioned technical scheme that this application embodiment provided passes through the main shaft current's of motor judgement motor whether normal operating, and then can obtain the abnormal conditions in the machine tool machining system that this motor corresponds in view of the above, and simultaneously, through the method in this embodiment, can monitor the operational aspect of motor automatically, need not the manual work and monitor the lathe of installing this motor, can greatly reduce the personnel selection cost, and for manual monitoring, the real-time is higher, can in time discover the abnormal conditions when the lathe moves, and then can effectively protect the lathe of installing this motor, improve its security and life.
Description
Technical Field
The application relates to the technical field of electromechanical control, in particular to a motor protection system and a motor protection method.
Background
The numerical control machine tool is key equipment in the production process of the industry and the manufacturing industry, the production efficiency and the precision can be improved, and abnormal contact can be caused between a workpiece and a cutter in the machining process of the numerical control machine tool due to various reasons. When the machining cutting amount is not reasonable or the cutter is seriously damaged, the cutting force of a machining system is increased, so that the motor torque is increased, the current of a spindle motor is increased and exceeds the normal working current. If the abnormal conditions of the numerical control machine tool in the working process cannot be accurately and quickly detected and corresponding protection actions are timely carried out, the processing systems of the motor, including a cutter, a workpiece, a clamp and the machine tool, can be damaged.
In view of the technical problems in the related art, no effective solution is provided at present.
Disclosure of Invention
To solve the above technical problem or at least partially solve the above technical problem, the present application provides a motor protection system and method.
In a first aspect, an embodiment of the present application provides a motor protection system, including: the device comprises a current signal acquisition module, an AD conversion module and a controller which are sequentially connected with one another;
the current signal acquisition module is used for acquiring a current signal obtained by sampling a main shaft of the motor;
the AD conversion module is used for converting the current signal into a digital signal;
the controller is used for obtaining a control strategy of the motor according to the digital signal and a preset current upper limit threshold value.
Optionally, as in the foregoing motor protection system, the current signal obtaining module includes: a current sensor and an integration module electrically connected to each other;
the current sensor is used for sensing the main shaft current of the main shaft to obtain a voltage signal corresponding to the differential signal of the main shaft current;
the integration module is used for integrating the voltage signal to obtain an integrated voltage signal in direct proportion to the spindle current signal, and obtaining the current signal according to the integrated voltage signal.
Optionally, as in the foregoing motor protection system, the integration module includes: a first capacitor C1, a second capacitor C2, a first resistor R1, a second resistor Rf, a third resistor Rs, and an operational amplifier;
one end of the first capacitor C1 is connected to the current sensor, and the other end of the first capacitor C1 is connected to a first resistor R1 in series and is connected to the inverting input end of the operational amplifier through the first resistor R1;
two ends of the second resistor Rf are respectively connected to the inverting input end and the output end of the operational amplifier;
the second capacitor C2 and the second resistor Rf are connected in parallel;
one end of the third resistor Rs is connected with the equidirectional output end of the operational amplifier, and the other end of the third resistor Rs is grounded.
In a second aspect, an embodiment of the present application provides a motor protection method, including:
acquiring a voltage signal obtained by sampling a main shaft of a motor;
obtaining current numerical value information corresponding to the spindle current of the motor according to the voltage signal;
and starting a protection strategy corresponding to the motor when the current numerical value information exceeds a preset current upper limit threshold value.
Optionally, as in the foregoing motor protection method, when the current value information exceeds a preset current upper limit threshold, starting a protection strategy corresponding to the motor includes:
when the current numerical value information exceeds a preset current upper limit threshold, acquiring real-time current numerical value information corresponding to the motor according to a preset time interval;
and when the real-time current numerical value information exceeds the current upper limit threshold, executing a protection action corresponding to the protection strategy.
Optionally, as in the foregoing motor protection method, after the protection action corresponding to the protection policy is executed, the method further includes:
acquiring alarm information corresponding to the motor according to the protection action;
and starting a signal lamp and a buzzer corresponding to the motor according to the alarm signal.
Optionally, as in the foregoing motor protection method, the method further includes:
acquiring historical running state information of the motor;
determining the corresponding relation between the main shaft current value and the running time according to the historical running state information;
acquiring fault time information of the motor;
determining fault spindle current numerical value information corresponding to the fault time information according to the corresponding relation;
and obtaining the current upper limit threshold according to the fault spindle current numerical value information.
In a third aspect, an embodiment of the present application provides a motor protection device, including:
the voltage signal acquisition module is used for acquiring a voltage signal obtained by sampling a main shaft of the motor;
the digital signal acquisition module is used for acquiring current numerical value information corresponding to the spindle current of the motor according to the voltage signal;
and the motor protection module is used for starting a protection strategy corresponding to the motor when the current value information exceeds a preset current upper limit threshold value.
Optionally, as for the foregoing motor protection device, the motor protection module includes:
the first obtaining unit is used for obtaining real-time current numerical value information corresponding to the motor according to a preset time interval when the current numerical value information exceeds a preset current upper limit threshold;
and the action execution unit is used for executing a protection action corresponding to the protection strategy when the real-time current numerical value information exceeds the current upper limit threshold value.
Optionally, as in the foregoing motor protection device, the motor protection module further includes:
the alarm information acquisition unit is used for acquiring alarm information corresponding to the motor according to the protection action;
and the alarm signal starting unit is used for starting a signal lamp and a buzzer corresponding to the motor according to the alarm signal.
Optionally, as aforementioned motor protection device, further includes:
the historical information acquisition module is used for acquiring historical running state information of the motor;
the corresponding relation determining module is used for determining the corresponding relation between the main shaft current value and the running time according to the historical running state information;
the fault time information acquisition module is used for acquiring fault time information of the motor;
the current value determining module is used for determining fault main shaft current value information corresponding to the fault time information according to the corresponding relation;
and the threshold value determining module is used for obtaining the current upper limit threshold value according to the fault spindle current numerical value information.
In a fourth aspect, an embodiment of the present application provides an electronic device, including: the system comprises a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory are communicated with each other through the communication bus;
the memory is used for storing a computer program;
the processor is configured to implement the processing method according to any one of the preceding claims when executing the computer program.
In a fifth aspect, embodiments of the present application provide a storage medium comprising a stored program, wherein the program is operable to perform the method steps of any one of the preceding claims.
The embodiment of the application provides a motor protection system and a method, wherein the method comprises the following steps: acquiring a voltage signal obtained by sampling a main shaft of a motor; obtaining current numerical value information corresponding to the spindle current of the motor according to the voltage signal; and starting a protection strategy corresponding to the motor when the current numerical value information exceeds a preset current upper limit threshold value. Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages: whether normal operating of motor is judged through the main shaft current of motor, and then can obtain the abnormal conditions in the lathe system that this motor corresponds in view of the above, and simultaneously, through the method in this embodiment, can monitor the operating conditions of motor automatically, need not the manual work and monitor the lathe of installing this motor, can greatly reduce the personnel selection cost, and for manual monitoring, the real-time is higher, can in time discover the abnormal conditions of lathe operation, and then can effectively protect the lathe of installing this motor, improve its security and life.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
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 described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a block diagram of a motor protection system according to an embodiment of the present disclosure;
fig. 2 is an equivalent circuit diagram of a current sensor according to an embodiment of the present disclosure;
fig. 3 is a circuit diagram of an integration module according to an embodiment of the present application;
fig. 4 is a schematic flowchart of a motor protection method according to an embodiment of the present disclosure;
fig. 5 is a block diagram of a motor protection device according to an embodiment of the present disclosure;
fig. 6 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Fig. 1 is a motor protection system provided in an embodiment of the present application, including: the device comprises a current signal acquisition module 1, an AD conversion module 2 and a controller 3 which are sequentially connected with one another;
the current signal acquisition module 1 is used for acquiring a current signal obtained by sampling a main shaft of the motor;
the AD conversion module 2 is used for converting the current signal into a digital signal;
the controller 3 is used for obtaining a control strategy of the motor according to the digital signal and a preset current upper limit threshold value.
Specifically, the current signal obtaining module 1 is a device for sampling current of a spindle of a motor and determining a change condition of the spindle current.
The current signal can be a signal obtained by directly collecting the current of the motor spindle; or a signal proportional to the spindle current obtained by measuring other data.
The current signals acquired by the current signal acquisition module 1 are generally analog signals; however, since the controller 3 can only process the digital signal when performing the analysis process, it is necessary to convert the current signal, which is originally an analog signal, into a digital signal by the AD conversion module 2.
After obtaining the digital signal, the controller 3 may analyze the data signal, and determine a relationship between the digital signal and the current upper limit threshold, so as to obtain a motor drive control strategy, where the control strategy may be pre-stored in a memory in the controller 3, and after obtaining the relationship between the digital signal and the current upper limit threshold, the controller 3 directly calls to obtain a corresponding control strategy, so as to control the operation state of the motor.
The control device in the embodiment has a simple structure, controls the motor through the current signal, has small data processing capacity, can have high response speed, can find abnormal conditions in the running environment of the motor in time, and avoids damaging and influencing components such as the motor.
In some embodiments, as in the motor protection system described above, the current signal acquisition module 1 includes: a current sensor 11 and an integration module 12 electrically connected to each other;
the current sensor 11 is configured to sense a spindle current of the spindle to obtain a voltage signal corresponding to a differential signal of the spindle current;
the integrating module 12 is configured to integrate the voltage signal to obtain an integrated voltage signal proportional to the spindle current signal, and obtain a current signal according to the integrated voltage signal.
Specifically, based on the characteristics of the Rogowski coil itself, such as no magnetic saturation, high accuracy, wide frequency band, large dynamic range, and good insulation performance, the current sensor 11 may employ an equivalent circuit such as the Rogowski coil (Rogowski coil) shown in fig. 2, where L0 is a self-inductance coil, R0 is a coil equivalent resistor, C0 is a stray capacitance of the coil, and Rs is a sampling resistor. i (t) is the measured current, and u (t) is the differential signal of the measured current.
Since the whole rogowski coil is equivalent to a differential circuit, an integrating circuit is needed to be connected after the output signal is restored into a measured current signal. However, since the rogowski coil converts the spindle current into a voltage signal by induction, and since the signal is a differential of the spindle current, an integrating circuit must be added for conversion in order to make the signal directly reflect the spindle current, so that the converted voltage is proportional to the spindle motor current signal.
By adopting the method of the embodiment, the cost is very low by adopting the mode of indirectly monitoring the motor current through the current sensor 11, and meanwhile, the current sensor 11 is convenient to install and does not need to change the structure of the machine tool provided with the motor.
As shown in fig. 3, in some embodiments, the integration module 12 includes, as previously described for the motor protection system: a first capacitor C1, a second capacitor C2, a first resistor R1, a second resistor Rf, a third resistor Rs, and an operational amplifier;
one end of the first capacitor C1 is connected to the current sensor 11, and the other end of the first capacitor C1 is connected to the first resistor R1 in series, and is connected to the inverting input terminal of the operational amplifier through the first resistor R1;
two ends of the second resistor Rf are respectively connected to the inverting input terminal and the output terminal of the operational amplifier;
the second capacitor C2 and the second resistor Rf are connected in parallel;
one end of the third resistor Rs is connected with the equidirectional output end of the operational amplifier, and the other end of the third resistor Rs is grounded.
Optionally, the rogowski coil is connected to the first capacitor C1, and outputs voltage signals u (t) to C1.
As shown in fig. 4, according to an embodiment of another aspect of the present application, there is also provided a motor protection method including the steps S1 to S3 as follows:
s1, acquiring a voltage signal obtained by sampling a main shaft of a motor.
Specifically, the current signal obtained by sampling the spindle of the motor may be obtained by detecting the current sensor in the foregoing embodiment, and specifically, since the current sensor cannot be directly connected to the motor for detection during detection, the Rogowski coil (i.e., Rogowski coil) is generally used for detection.
And S2, obtaining current numerical value information corresponding to the spindle current of the motor according to the voltage signal.
Specifically, when the rogowski coil is used as a current sensor, the spindle current is converted into a single voltage signal, but the signal is a differential of the spindle current, and therefore, it is necessary to process the current signal to obtain current value information corresponding to the main current of the motor.
One of the optional implementations may be: converting by adding an integrating circuit, so that the converted voltage is in direct proportion to a current signal of a spindle motor; and then a current value corresponding to the spindle current can be obtained through the voltage value, and current value information is obtained.
And S3, starting a protection strategy corresponding to the motor when the current value information exceeds a preset current upper limit threshold value.
Specifically, the current upper limit threshold value can be determined according to a current value when the motor fails in the daily operation process; further, the selection of the current upper limit threshold value can be selected according to the tolerance degree of the fault when the motor runs.
In summary, according to the scheme in this embodiment, whether the motor normally operates can be determined by determining the spindle current of the motor, and then an abnormal condition in the machine tool machining system corresponding to the motor can be obtained accordingly.
In some embodiments, as in the foregoing motor protection method, the step S3, when the current value information exceeds the preset current upper threshold, starts a protection strategy corresponding to the motor, including the following steps S31 and S32:
and S31, when the current value information exceeds a preset current upper limit threshold value, acquiring real-time current value information corresponding to the motor according to a preset time interval.
And S32, when the real-time current numerical value information exceeds the current upper limit threshold, executing a protection action corresponding to the protection strategy.
Specifically, the specific interval duration corresponding to the preset time interval can be selected according to the actual situation. When the current value information exceeds the preset current upper limit threshold, the real-time current value information corresponding to the motor is obtained according to the preset time interval, that is, when the current value information exceeds the current upper limit threshold, the motor cannot be immediately protected, and the judgment is carried out after the real-time current value information is obtained according to the preset time interval.
When the real-time current value information still exceeds the current upper limit threshold, the fact that the current value information exceeds the current upper limit threshold is not an accidental event, and the fact that a machine tool provided with the motor has certain faults is shown, for example: when abnormal conditions such as unreasonable cutting amount of a machine tool machining system, severe abrasion of a cutter and the like occur, cutting force is abnormally increased, so that the main shaft torque and the output torque of a motor thereof are increased.
Wherein the protection action may be: the motor is suddenly stopped to avoid influencing the normal operation of the motor or other devices due to certain faults of the machine tool.
When the real-time current value information obtained after the preset time interval does not exceed the current upper limit threshold, the current value information which is obtained before and exceeds the current upper limit threshold is an accidental event, and therefore related protection actions do not need to be executed.
By the method in the embodiment, the influence on production caused by sudden stop of the motor and even the machine tool due to accidental reasons can be avoided.
In some embodiments, as the motor protection method, after the step S32 executes the protection action corresponding to the protection strategy, the method further includes the following steps S33 and S34:
and S33, acquiring alarm information corresponding to the motor according to the protection action.
Specifically, the alarm information may be acquired while determining to execute the protection action, where the alarm information may be generated in advance and stored in a specific storage space, or may be generated when determining to execute the protection action.
And S34, starting a signal lamp and a buzzer corresponding to the motor according to the alarm signal.
Specifically, after the alarm signal is obtained, the alarm signal can be sent to a receiving module of the device for executing alarm, and then the device for executing alarm can start a signal lamp and a buzzer to alarm; further, the alarm signal can be sent to a platform or a terminal for maintaining the motor or a machine tool provided with the motor through the APP or other information, so that related personnel can perform troubleshooting in time.
In some embodiments, the motor protection method as described above further includes steps P1 to P5 as follows:
and P1, acquiring historical running state information of the motor.
Specifically, the historical operating state information includes state information of the motor in normal operation and state information in a fault state.
Furthermore, the data amount in the historical operating state information needs to reach the preset amount requirement, so that the historical operating state information has referential property.
And P2, determining the corresponding relation between the main shaft current value and the operation time according to the historical operation state information.
Specifically, a change curve obtained by the change of the main shaft current value along with the time can be obtained according to the corresponding relation between the main shaft current value and the operation time in the historical operation state information.
And P3, acquiring the fault time information of the motor.
Specifically, the fault time information of the motor may be obtained according to fault information recorded in history, for example, information such as a time when the fault occurs and a duration of the fault may be obtained in the fault information.
And P4, determining the numerical information of the current of the fault spindle corresponding to the fault time information according to the corresponding relation.
Specifically, a time period corresponding to the fault time information can be determined in the variation curve, then a spindle current value obtained in the time period is determined, and the spindle current value is recorded as fault spindle current value information; further, each set of data in the fault spindle current value information includes spindle current values and time corresponding to each other.
Step P5. obtains the current upper threshold value according to the fault spindle current value information.
Specifically, after obtaining the fault spindle current value information, the method of obtaining the current upper limit threshold may be: determining the minimum value in the numerical information of the current of the fault spindle, and taking the minimum value as the upper limit threshold of the current; the method can also be as follows: and determining an average value or a median value and the like in the fault spindle current numerical value information, and using the average value or the median value as a current upper limit threshold value. The current upper limit threshold value obtained according to the fault spindle current numerical value information can also be obtained by other methods, which are not listed here.
The application of the above method embodiment is as follows:
the PMC implementing the above method has three sets of input signals: the protection device comprises current numerical value information reflecting the current magnitude of the spindle motor, a protection device use signal (a signal for realizing a protection strategy) and a reset protection system signal after fault elimination, wherein the current numerical value information is input at the front stage. The input signal of the machine tool during normal work is subjected to multiple sampling analysis, the average value of multiple sampling is taken as the standard value of the machine tool during normal work, the standard value is multiplied by a coefficient larger than 1 and is written into a fixed memory address unit of the machine tool PMC as a safety threshold. When protection is started, PMC carries out periodic scanning on a preceding-stage input signal, then compares the value with a safety threshold (namely, a current upper limit threshold), and if the value is smaller than the safety threshold, the protection does not act; if the PMC protection program is larger than the safety threshold, waiting for a specific time (to avoid occasional fluctuation, namely false information), if the input value is still larger than the safety threshold, then the PMC protection program runs, performs protection action, and the machine tool is in emergency stop, and simultaneously outputs an external signal for lighting a special protection signal lamp and a buzzer; after the fault is eliminated, the machine tool emergency stop state can be relieved through the reset protection device.
As shown in fig. 5, according to an embodiment provided by another aspect of the present application, there is also provided a motor protection device including:
the voltage signal acquisition module 21 is configured to acquire a voltage signal obtained by sampling a main shaft of the motor;
the digital signal acquisition module 22 is used for acquiring current numerical value information corresponding to the spindle current of the motor according to the voltage signal;
and the motor protection module 23 is configured to start a protection strategy corresponding to the motor when the current value information exceeds a preset current upper limit threshold.
Specifically, the specific process of implementing the functions of each module in the apparatus according to the embodiment of the present invention may refer to the related description in the method embodiment, and is not described herein again.
In some embodiments, a motor protection device, a motor protection module as described above, comprises:
the first acquisition unit is used for acquiring real-time current numerical value information corresponding to the motor according to a preset time interval when the current numerical value information exceeds a preset current upper limit threshold;
and the action execution unit is used for executing the protection action corresponding to the protection strategy when the real-time current numerical value information exceeds the current upper limit threshold value.
Specifically, the specific process of implementing the functions of each module in the apparatus according to the embodiment of the present invention may refer to the related description in the method embodiment, and is not described herein again.
In some embodiments, as in the foregoing motor protection device, the motor protection module further comprises:
the alarm information acquisition unit is used for acquiring alarm information corresponding to the motor according to the protection action;
and the alarm signal starting unit is used for starting a signal lamp and a buzzer corresponding to the motor according to the alarm signal.
Specifically, the specific process of implementing the functions of each module in the apparatus according to the embodiment of the present invention may refer to the related description in the method embodiment, and is not described herein again.
In some embodiments, a motor protection device as described above, further comprising:
the historical information acquisition module is used for acquiring historical running state information of the motor;
the corresponding relation determining module is used for determining the corresponding relation between the main shaft current value and the operation time according to the historical operation state information;
the fault time information acquisition module is used for acquiring fault time information of the motor;
the current value determining module is used for determining fault main shaft current value information corresponding to the fault time information according to the corresponding relation;
and the threshold value determining module is used for obtaining the current upper limit threshold value according to the numerical value information of the current of the fault spindle.
Specifically, the specific process of implementing the functions of each module in the apparatus according to the embodiment of the present invention may refer to the related description in the method embodiment, and is not described herein again.
According to another embodiment of the present application, there is also provided an electronic apparatus including: as shown in fig. 6, the electronic device may include: the system comprises a processor 1501, a communication interface 1502, a memory 1503 and a communication bus 1504, wherein the processor 1501, the communication interface 1502 and the memory 1503 complete communication with each other through the communication bus 1504.
A memory 1503 for storing a computer program;
the processor 1501 is configured to implement the steps of the above-described method embodiments when executing the program stored in the memory 1503.
The bus mentioned in the electronic device may be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown, but this does not mean that there is only one bus or one type of bus.
The communication interface is used for communication between the electronic equipment and other equipment.
The Memory may include a Random Access Memory (RAM) or a Non-Volatile Memory (NVM), such as at least one disk Memory. Optionally, the memory may also be at least one memory device located remotely from the processor.
The Processor may be a general-purpose Processor, including a Central Processing Unit (CPU), a Network Processor (NP), and the like; but may also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, discrete hardware component.
The embodiment of the present application further provides a storage medium, where the storage medium includes a stored program, and the program executes the method steps of the foregoing method embodiment when running.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A motor protection system, comprising: the device comprises a current signal acquisition module (1), an AD conversion module (2) and a controller (3) which are sequentially connected with one another;
the current signal acquisition module (1) is used for acquiring a current signal obtained by sampling a main shaft of the motor;
the AD conversion module (2) is used for converting the current signal into a digital signal;
and the controller (3) is used for obtaining a control strategy of the motor according to the digital signal and a preset current upper limit threshold value.
2. The motor protection system according to claim 1, characterized in that the current signal acquisition module (1) comprises: a current sensor (11) and an integration module (12) electrically connected to each other;
the current sensor (11) is used for sensing the main shaft current of the main shaft to obtain a voltage signal corresponding to the differential signal of the main shaft current;
the integration module (12) is used for integrating the voltage signal to obtain an integrated voltage signal which is in direct proportion to the spindle current signal, and obtaining the current signal according to the integrated voltage signal.
3. The motor protection system of claim 2, wherein the integration module (12) comprises: a first capacitor C1, a second capacitor C2, a first resistor R1, a second resistor Rf, a third resistor Rs, and an operational amplifier;
one end of the first capacitor C1 is connected to the current sensor (11), and the other end of the first capacitor C1 is connected to a first resistor R1 which are connected in series with each other and are connected to the inverting input end of the operational amplifier through the first resistor R1;
two ends of the second resistor Rf are respectively connected to the inverting input end and the output end of the operational amplifier;
the second capacitor C2 and the second resistor Rf are connected in parallel;
one end of the third resistor Rs is connected with the equidirectional output end of the operational amplifier, and the other end of the third resistor Rs is grounded.
4. A method of protecting a motor, comprising:
acquiring a voltage signal obtained by sampling a main shaft of a motor;
obtaining current numerical value information corresponding to the spindle current of the motor according to the voltage signal;
and starting a protection strategy corresponding to the motor when the current numerical value information exceeds a preset current upper limit threshold value.
5. The motor protection method according to claim 4, wherein the starting of the protection strategy corresponding to the motor when the current value information exceeds a preset current upper threshold value comprises:
when the current numerical value information exceeds a preset current upper limit threshold, acquiring real-time current numerical value information corresponding to the motor according to a preset time interval;
and when the real-time current numerical value information exceeds the current upper limit threshold, executing a protection action corresponding to the protection strategy.
6. The motor protection method of claim 5, further comprising, after performing the protection action corresponding to the protection strategy:
acquiring alarm information corresponding to the motor according to the protection action;
and starting a signal lamp and a buzzer corresponding to the motor according to the alarm signal.
7. The motor protection method of claim 4, further comprising:
acquiring historical running state information of the motor;
determining the corresponding relation between the main shaft current value and the running time according to the historical running state information;
acquiring fault time information of the motor;
determining fault spindle current numerical value information corresponding to the fault time information according to the corresponding relation;
and obtaining the current upper limit threshold according to the fault spindle current numerical value information.
8. A motor protection device, comprising:
the voltage signal acquisition module is used for acquiring a voltage signal obtained by sampling a main shaft of the motor;
the digital signal acquisition module is used for acquiring current numerical value information corresponding to the spindle current of the motor according to the voltage signal;
and the motor protection module is used for starting a protection strategy corresponding to the motor when the current value information exceeds a preset current upper limit threshold value.
9. An electronic device, comprising: the system comprises a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory are communicated with each other through the communication bus;
the memory is used for storing a computer program;
the processor, when executing the computer program, implementing the method steps of any of claims 4 to 7.
10. A storage medium, characterized in that the storage medium comprises a stored program, wherein the program is operative to perform the method steps of any of the preceding claims 4 to 7.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010998404.XA CN112122999A (en) | 2020-09-21 | 2020-09-21 | Motor protection system and method |
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| CN202010998404.XA CN112122999A (en) | 2020-09-21 | 2020-09-21 | Motor protection system and method |
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