CN116094415A - Method, system, readable storage medium and device for preventing motor from demagnetizing - Google Patents

Method, system, readable storage medium and device for preventing motor from demagnetizing Download PDF

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Publication number
CN116094415A
CN116094415A CN202310069831.3A CN202310069831A CN116094415A CN 116094415 A CN116094415 A CN 116094415A CN 202310069831 A CN202310069831 A CN 202310069831A CN 116094415 A CN116094415 A CN 116094415A
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China
Prior art keywords
pwm pulse
pulse signal
motor
preset threshold
duty ratio
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CN202310069831.3A
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Chinese (zh)
Inventor
周斌
罗明
江波
彭君
冯洁
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Sanchuan Wisdom Technology Co Ltd
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Sanchuan Wisdom Technology Co Ltd
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Priority to CN202310069831.3A priority Critical patent/CN116094415A/en
Publication of CN116094415A publication Critical patent/CN116094415A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
    • H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
    • H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
    • H02P27/085—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation wherein the PWM mode is adapted on the running conditions of the motor, e.g. the switching frequency
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Direct Current Motors (AREA)

Abstract

The invention discloses a method, a system, a readable storage medium and a device for preventing demagnetization of a motor, wherein the method comprises the following steps: performing level conversion and filtering on the PWM pulse signal to obtain a target PWM pulse signal, and conveying the target PWM pulse signal to a motor to be controlled; judging whether the duty ratio of the target PWM pulse signal reaches a first preset threshold value or not; if the duty ratio of the target PWM pulse signal reaches the preset threshold value, continuously transmitting the target PWM pulse signal with the duty ratio of the first preset threshold value to the motor to be controlled in a first preset time period, and continuously transmitting the target PWM pulse signal with the duty ratio of the second preset threshold value to the motor to be controlled in a second preset time period. The duty ratio of PWM waveform in the valve action process is dynamically regulated, so that the working voltage of a valve motor in each stage of the whole valve opening and closing process is controlled, the rotating speed of the motor is regulated, and the problem of motor demagnetization in the valve working process is solved.

Description

Method, system, readable storage medium and device for preventing motor from demagnetizing
Technical Field
The invention belongs to the technical field of motor control, and particularly relates to a method, a system, a readable storage medium and a device for preventing motor demagnetization.
Background
When the motor is used for driving the valve to conduct valve opening and closing actions through magnetic transmission, the driven rotor of the valve is static when the valve starts to act, if the rotating speed of the motor is too high, the rotating speed difference between the driving rotor and the driven rotor is too large, the magnetic transmission system can be demagnetized, and the transmission system can not drive the valve to work normally after the demagnetization.
In the prior art, when the valve moves in place, the driven rotor is suddenly static, the rotating speed difference between the driving rotor and the driven rotor is overlarge, the moment of the motor suddenly increases to cause the demagnetization of the magnetic transmission system, and at the moment, the valve works in place but the demagnetization can cause the system to judge the working state of the valve through the working current of the motor, so that the valve stops working.
Disclosure of Invention
The invention provides a method, a system, a readable storage medium and a device for preventing motor demagnetization, which are used for solving the technical problem of motor demagnetization in the valve working process.
In a first aspect, the present invention provides a method of preventing demagnetization of an electric machine, comprising: performing level conversion and filtering on the PWM pulse signal to obtain a target PWM pulse signal, and conveying the target PWM pulse signal to a motor to be controlled so as to control the motor to be controlled to rotate, wherein the duty ratio of the target PWM pulse signal is dynamically adjusted along with time variation; judging whether the duty ratio of the target PWM pulse signal reaches a first preset threshold value or not, wherein the first preset threshold value is the maximum value of dynamic adjustment of the duty ratio along with time variation; if the duty ratio of the target PWM pulse signal reaches a preset threshold value, continuously transmitting the target PWM pulse signal with the duty ratio of the first preset threshold value to the motor to be controlled in a first preset time period, and continuously transmitting the target PWM pulse signal with the duty ratio of the second preset threshold value to the motor to be controlled in a second preset time period, wherein the second preset threshold value is smaller than the first preset threshold value.
In a second aspect, the present invention provides a control system for preventing demagnetization of a motor, including: the processing module is configured to perform level conversion processing and filtering processing on the PWM pulse signals to obtain target PWM pulse signals, and convey the target PWM pulse signals to a motor to be controlled so as to control the motor to be controlled to rotate, wherein the duty ratio of the target PWM pulse signals is dynamically adjusted along with time variation; the judging module is configured to judge whether the duty ratio of the target PWM pulse signal reaches a first preset threshold value, wherein the first preset threshold value is the maximum value of dynamic adjustment of the duty ratio along with time variation; the control module is configured to continuously transmit the target PWM pulse signal with the duty ratio of a first preset threshold to the motor to be controlled in a first preset time period and continuously transmit the target PWM pulse signal with the duty ratio of a second preset threshold to the motor to be controlled in a second preset time period if the duty ratio of the target PWM pulse signal reaches the preset threshold, wherein the second preset threshold is smaller than the first preset threshold.
In a third aspect, there is provided an electronic device, comprising: the device comprises at least one processor and a memory communicatively connected with the at least one processor, wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the steps of the method for preventing demagnetization of a motor of any embodiment of the present invention.
In a fourth aspect, the present invention also provides a computer readable storage medium having stored thereon a computer program, which when executed by a processor, causes the processor to perform the steps of the method of preventing demagnetization of a motor of any embodiment of the present invention.
According to the method, the system, the readable storage medium and the device for preventing the motor from demagnetizing, the control output of the motor control circuit is changed from a fixed level to a PWM waveform output of 100KHZ, and the duty ratio of the PWM waveform in the valve action process is dynamically adjusted, so that the working voltage of the valve motor in each stage of the whole valve opening and closing process is controlled, the rotating speed of the motor is further adjusted, and the problem of motor demagnetization in the valve working process is solved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for preventing demagnetization of a motor according to an embodiment of the present invention;
FIG. 2 is a block diagram of a control system for preventing demagnetization of a motor according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, a flowchart of a method for preventing demagnetization of a motor is shown.
As shown in fig. 1, the method for preventing the motor from demagnetizing specifically includes the following steps:
step S101, performing level conversion processing and filtering processing on the PWM pulse signal to obtain a target PWM pulse signal, and conveying the target PWM pulse signal to a motor to be controlled so as to control the motor to be controlled to rotate.
In this embodiment, when the PWM pulse signal is a PWM pulse high level signal, the PWM pulse high level signal is converted into a low level value; converting the PWM pulse low-level signal into a high-level value when the PWM pulse signal is a PWM pulse low-level signal; the low level value and the high level value are subjected to a filtering process.
It should be noted that, the duty ratio of the target PWM pulse signal is dynamically adjusted with time, specifically, the duty ratio of the target PWM pulse signal gradually increases from 0.6 to 1.0, and the duty ratio of the target PWM pulse signal increases by 0.1 every 0.5 seconds.
Step S102, judging whether the duty ratio of the target PWM pulse signal reaches a first preset threshold value.
In this embodiment, the first preset threshold is a maximum value of the dynamic adjustment of the time-varying duty cycle.
Step S103, if the duty ratio of the target PWM pulse signal reaches a preset threshold, continuously transmitting the target PWM pulse signal with the duty ratio being the first preset threshold to the motor to be controlled in a first preset time period, and continuously transmitting the target PWM pulse signal with the duty ratio being the second preset threshold to the motor to be controlled in a second preset time period, wherein the second preset threshold is smaller than the first preset threshold.
In this embodiment, the first preset time period and the second preset time period are continuous time periods, and the continuous time periods are specifically time periods from 2 seconds of valve action to valve opening and closing in place.
Specifically, a current value of a motor to be controlled is obtained, a first preset time period corresponding to the current value is determined according to a corresponding relation between the current value of the motor to be controlled and the preset time period, the current value is 50mA, the first preset time period corresponding to the 50mA is the valve action time of 2 th to 8 th seconds, a target PWM pulse signal with the duty ratio of a first preset threshold value is continuously transmitted to the motor to be controlled in the valve action time of 2 nd to 8 th seconds, and then the target PWM pulse signal with the duty ratio of a second preset threshold value is continuously transmitted to the motor to be controlled in the valve action time of 2 nd to 8 th seconds.
In summary, in the method of the embodiment, the control output of the motor control circuit is changed from a fixed level to a PWM waveform output of 100KHZ, and the duty ratio of the PWM waveform in the valve action process is dynamically adjusted, so as to control the "working voltage" of the valve motor in each stage of the whole valve opening and closing process, and further adjust the rotation speed of the motor, thereby solving the problem of motor demagnetization in the valve working process.
In a specific embodiment, the control process of preventing the motor from demagnetizing is mainly divided into 3 stages to control the motor to work:
in the first stage, the PWM duty ratio is gradually increased from 0.6 to 1.0 2 seconds before the valve acts, and the program controls the duty ratio to be increased by 0.1 every 0.5 seconds, so that the rotating speed of the driven rotor is slowly increased, and demagnetization is avoided.
In the second stage, the valve is operated for 2 to 8 seconds (the default value of the current gearbox is configurable), the PWM duty ratio is kept at 1.0, and the driven rotor always keeps the highest rotating speed at the moment, so that the valve is ensured to be operated rapidly in the stage.
This scheme is mainly aimed at the motor that the water gauge was used, but the motor is inside after the long-time not using, because the rotor surface can the slight oxidation of product, leads to motor rotational speed to become slow, and the electric current can descend, and the time of ooff valve can prolong, can prolong the time of ooff valve through judging the electric current change, prolongs the time of second stage.
Normally the current in the second phase is relatively stable, for example at 50mA, but if the motor rotor is oxidized, the current may become 40mA, but at the same time the motor speed decreases and the valve opening and closing time increases.
In the third stage, the valve is operated for 8 seconds until the switching valve is in place, the PWM duty ratio is kept to be 0.7, the working torque of the motor and the rotating speed of the driven rotor are reduced, and demagnetization is avoided after the valve is in place.
In summary, the method of the embodiment can achieve the following technical effects:
1. the control circuit can adjust the rotating speed of the motor in the working process without adding any control and adjustment circuit;
2. compared with the voltage division regulating motor working voltage, the voltage loss can not be caused by regulating the motor rotating speed through the PWM duty ratio, the battery loss is small, and the regulation is more accurate;
3. PWM waveform control is carried out according to three stages of valve magnetic transmission control, so that the valve is ensured not to demagnetize when the valve starts to act, the action time is shortened by quicker action in the middle-stage action process, and the valve is prevented from demagnetizing when in place.
Referring to fig. 2, a block diagram of a control system for preventing demagnetization of a motor is shown.
As shown in fig. 2, the control system 200 for preventing demagnetization of a motor includes a processing module 210, a judging module 220, and a control module 230.
The processing module 210 is configured to perform level conversion processing and filtering processing on the PWM pulse signal to obtain a target PWM pulse signal, and transmit the target PWM pulse signal to the motor to be controlled, so as to control the motor to be controlled to rotate, where the duty ratio of the target PWM pulse signal is dynamically adjusted along with time variation; a determining module 220 configured to determine whether the duty cycle of the target PWM pulse signal reaches a first preset threshold, where the first preset threshold is a maximum value of dynamic adjustment of the duty cycle over time; the control module 230 is configured to continuously transmit the target PWM pulse signal with the duty ratio being the first preset threshold to the motor to be controlled in a first preset time period if the duty ratio of the target PWM pulse signal reaches the preset threshold, and continuously transmit the target PWM pulse signal with the duty ratio being the second preset threshold to the motor to be controlled in a second preset time period, wherein the second preset threshold is smaller than the first preset threshold.
It should be understood that the modules depicted in fig. 2 correspond to the various steps in the method described with reference to fig. 1. Thus, the operations and features described above for the method and the corresponding technical effects are equally applicable to the modules in fig. 2, and are not described here again.
In other embodiments, embodiments of the present invention further provide a computer readable storage medium having stored thereon a computer program, which when executed by a processor, causes the processor to perform the surgical instrument inventory method of any of the method embodiments described above;
as one embodiment, the computer-readable storage medium of the present invention stores computer-executable instructions configured to:
performing level conversion and filtering on the PWM pulse signal to obtain a target PWM pulse signal, and conveying the target PWM pulse signal to a motor to be controlled so as to control the motor to be controlled to rotate, wherein the duty ratio of the target PWM pulse signal is dynamically adjusted along with time variation;
judging whether the duty ratio of the target PWM pulse signal reaches a first preset threshold value or not, wherein the first preset threshold value is the maximum value of dynamic adjustment of the duty ratio along with time variation;
if the duty ratio of the target PWM pulse signal reaches a preset threshold value, continuously transmitting the target PWM pulse signal with the duty ratio of the first preset threshold value to the motor to be controlled in a first preset time period, and continuously transmitting the target PWM pulse signal with the duty ratio of the second preset threshold value to the motor to be controlled in a second preset time period, wherein the second preset threshold value is smaller than the first preset threshold value.
The computer readable storage medium may include a storage program area and a storage data area, wherein the storage program area may store an operating system, at least one application program required for a function; the stored data area may store data created from the use of the surgical instrument inventory device, and the like. In addition, the computer-readable storage medium may include high-speed random access memory, and may also include memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid-state storage device. In some embodiments, the computer readable storage medium optionally includes memory remotely located relative to the processor, which may be connected to the surgical instrument inventory device via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
Fig. 3 is a schematic structural diagram of an electronic device according to an embodiment of the present invention, as shown in fig. 3, where the device includes: a processor 310 and a memory 320. The electronic device may further include: an input device 330 and an output device 340. The processor 310, memory 320, input device 330, and output device 340 may be connected by a bus or other means, for example in fig. 3. Memory 320 is the computer-readable storage medium described above. The processor 310 executes various functional applications of the server and data processing by running non-volatile software programs, instructions and modules stored in the memory 320, i.e., implements the surgical instrument inventory method of the method embodiments described above. The input device 330 may receive input numeric or character information and generate key signal inputs related to user settings and function control of the surgical instrument inventory device. The output 540 may include a display device such as a display screen.
The electronic equipment can execute the method provided by the embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method. Technical details not described in detail in this embodiment may be found in the methods provided in the embodiments of the present invention.
As an embodiment, the electronic device is applied to a surgical instrument checking device, and is used for a client, and includes: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being executable by the at least one processor to enable the at least one processor to:
performing level conversion and filtering on the PWM pulse signal to obtain a target PWM pulse signal, and conveying the target PWM pulse signal to a motor to be controlled so as to control the motor to be controlled to rotate, wherein the duty ratio of the target PWM pulse signal is dynamically adjusted along with time variation;
judging whether the duty ratio of the target PWM pulse signal reaches a first preset threshold value or not, wherein the first preset threshold value is the maximum value of dynamic adjustment of the duty ratio along with time variation;
if the duty ratio of the target PWM pulse signal reaches a preset threshold value, continuously transmitting the target PWM pulse signal with the duty ratio of the first preset threshold value to the motor to be controlled in a first preset time period, and continuously transmitting the target PWM pulse signal with the duty ratio of the second preset threshold value to the motor to be controlled in a second preset time period, wherein the second preset threshold value is smaller than the first preset threshold value.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on such understanding, the foregoing technical solutions may be embodied essentially or in part in the form of a software product, which may be stored in a computer-readable storage medium, such as a ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to perform the various embodiments or methods of some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (8)

1. A method of preventing demagnetization of an electric machine, comprising:
performing level conversion and filtering on the PWM pulse signal to obtain a target PWM pulse signal, and conveying the target PWM pulse signal to a motor to be controlled so as to control the motor to be controlled to rotate, wherein the duty ratio of the target PWM pulse signal is dynamically adjusted along with time variation;
judging whether the duty ratio of the target PWM pulse signal reaches a first preset threshold value or not, wherein the first preset threshold value is the maximum value of dynamic adjustment of the duty ratio along with time variation;
if the duty ratio of the target PWM pulse signal reaches a preset threshold value, continuously transmitting the target PWM pulse signal with the duty ratio of the first preset threshold value to the motor to be controlled in a first preset time period, and continuously transmitting the target PWM pulse signal with the duty ratio of the second preset threshold value to the motor to be controlled in a second preset time period, wherein the second preset threshold value is smaller than the first preset threshold value.
2. The method of claim 1, wherein continuously delivering the target PWM pulse signal having the duty cycle of the first preset threshold to the motor to be controlled for the first preset period of time comprises:
acquiring a current value of the motor to be controlled;
determining a first preset time period corresponding to the current value according to a preset corresponding relation between the current value of the motor to be controlled and the preset time period;
and continuously transmitting a target PWM pulse signal with the duty ratio of a first preset threshold value to the motor to be controlled in the first preset time period.
3. The method for preventing demagnetization of a motor according to claim 1, wherein the performing level conversion processing and filtering processing on the PWM pulse signal to obtain the target PWM pulse signal includes:
converting the PWM pulse high-level signal into a low-level value under the condition that the PWM pulse signal is a PWM pulse high-level signal; converting the PWM pulse low-level signal into a high-level value when the PWM pulse signal is a PWM pulse low-level signal;
and filtering the low level value and the high level value.
4. A method of preventing demagnetization of an electrical machine according to claim 1, wherein the duty cycle of the target PWM pulse signal is dynamically adjusted over time is in particular:
the duty cycle of the target PWM pulse signal gradually increases from 0.6 to 1.0, and the duty cycle of the target PWM pulse signal increases by 0.1 every 0.5 seconds.
5. The method of claim 1, wherein the first preset time period and the second preset time period are a continuous time period, and the continuous time period is a time period from 2 seconds of valve action to valve opening and closing in place.
6. A control system for preventing demagnetization of a motor, comprising:
the processing module is configured to perform level conversion processing and filtering processing on the PWM pulse signals to obtain target PWM pulse signals, and convey the target PWM pulse signals to a motor to be controlled so as to control the motor to be controlled to rotate, wherein the duty ratio of the target PWM pulse signals is dynamically adjusted along with time variation;
the judging module is configured to judge whether the duty ratio of the target PWM pulse signal reaches a first preset threshold value, wherein the first preset threshold value is the maximum value of dynamic adjustment of the duty ratio along with time variation;
the control module is configured to continuously transmit the target PWM pulse signal with the duty ratio of a first preset threshold to the motor to be controlled in a first preset time period and continuously transmit the target PWM pulse signal with the duty ratio of a second preset threshold to the motor to be controlled in a second preset time period if the duty ratio of the target PWM pulse signal reaches the preset threshold, wherein the second preset threshold is smaller than the first preset threshold.
7. An electronic device, comprising: at least one processor, and a memory communicatively coupled to the at least one processor, wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of any one of claims 1 to 5.
8. A computer readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, implements the method of any one of claims 1 to 5.
CN202310069831.3A 2023-02-07 2023-02-07 Method, system, readable storage medium and device for preventing motor from demagnetizing Pending CN116094415A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310069831.3A CN116094415A (en) 2023-02-07 2023-02-07 Method, system, readable storage medium and device for preventing motor from demagnetizing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310069831.3A CN116094415A (en) 2023-02-07 2023-02-07 Method, system, readable storage medium and device for preventing motor from demagnetizing

Publications (1)

Publication Number Publication Date
CN116094415A true CN116094415A (en) 2023-05-09

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