CN117375479A - Speed monitoring system and method for raw material hoister - Google Patents
Speed monitoring system and method for raw material hoister Download PDFInfo
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- CN117375479A CN117375479A CN202311332566.XA CN202311332566A CN117375479A CN 117375479 A CN117375479 A CN 117375479A CN 202311332566 A CN202311332566 A CN 202311332566A CN 117375479 A CN117375479 A CN 117375479A
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- 238000005259 measurement Methods 0.000 claims abstract description 41
- 230000004044 response Effects 0.000 claims abstract description 29
- 230000033228 biological regulation Effects 0.000 claims abstract description 5
- 230000008569 process Effects 0.000 claims description 26
- 230000001105 regulatory effect Effects 0.000 claims description 18
- 238000012546 transfer Methods 0.000 claims description 17
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Classifications
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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
- H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
- H02P23/14—Estimation or adaptation of motor parameters, e.g. rotor time constant, flux, speed, current or voltage
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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
- H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
- H02P23/0004—Control strategies in general, e.g. linear type, e.g. P, PI, PID, using robust control
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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
- H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
- H02P23/04—Arrangements or methods for the control of AC motors characterised by a control method other than vector control specially adapted for damping motor oscillations, e.g. for reducing hunting
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Abstract
The application provides a speed monitoring system and method of raw materials lifting machine, the speed monitoring system of raw materials lifting machine includes: the rotating speed measuring module is configured to measure the rotating speed of the motor in the raw material hoister; the rotating speed comparison module is connected with the rotating speed measurement module and is configured to compare the rotating speed with the expected rotating speed and determine a comparison result; the voltage control module is connected with the rotating speed comparison module and is configured to adjust the control voltage of the motor in the raw material hoister according to the comparison result; responsive to the rotational speed being higher than the desired rotational speed in the comparison, reducing a control voltage of the motor; and in response to the rotational speed being lower than the desired rotational speed in the comparison result, increasing a control voltage of the motor. The elevator can be stabilized at a desired speed by combining hardware regulation and software regulation.
Description
Technical Field
The application belongs to the technical field of production, relates to a speed monitoring system, and particularly relates to a speed monitoring system and method of a raw material hoister.
Background
In the automatic production process, a raw material workshop feeding link is an important link of the production process, for example, a glass production link, and the main application of the feeding link in glass production is storing, weighing and mixing raw materials such as silica sand, dolomite, sodium carbonate and the like which are necessary for producing glass. The elevator is used for conveying raw materials from the ground level to the high-level bin port, and the huge bin can store glass raw materials for use at any time. When the elevator works, the condition of the running speed of the elevator is an important influence factor of the storage efficiency of a glass factory, and the running speed of the elevator is too fast to cause the glass raw materials to be scattered from a high position, so that the time cost and the labor cost of storage are greatly increased, and the production cost and the selling price of glass products are finally influenced.
In the prior art, in order to prevent the operation speed of the raw material hoist from being too high, a rotating speed monitoring device is usually arranged in a control loop of the hoist, however, in the prior art, the speed condition control of the hoist mainly depends on the start and stop of a control motor, and the service life of the motor is greatly reduced due to frequent start and stop. In addition, in the ascending process of the material frame, the material frame shakes to scatter the raw materials from the height, so that casualties occur.
Disclosure of Invention
The application provides a speed monitoring system and a speed monitoring method of a raw material elevator, which are used for solving the problem of unstable operation of the raw material elevator.
In a first aspect, the present application provides a speed monitoring system for a feedstock elevator, the system comprising: the rotating speed measuring module is configured to measure the rotating speed of the motor in the raw material hoister; the rotating speed comparison module is connected with the rotating speed measurement module and is configured to compare the rotating speed with the expected rotating speed and determine a comparison result; the voltage control module is connected with the rotating speed comparison module and is configured to adjust the control voltage of the motor in the raw material hoister according to the comparison result; responsive to the rotational speed being higher than the desired rotational speed in the comparison, reducing a control voltage of the motor; and in response to the rotational speed being lower than the desired rotational speed in the comparison result, increasing a control voltage of the motor.
In the application, the closed-loop feedback of the control voltage of the motor is built through the hardware circuit, the motor rotating speed of the raw material hoist is adjusted in real time from hardware, and the unstable operation condition of the raw material hoist is improved.
In one implementation manner of the first aspect, the rotation speed measurement module includes a rotation speed velometer and a voltage division unit; the rotating speed velometer is mechanically connected with a motor of the raw material elevator and is configured to convert the rotating speed of the motor in the raw material elevator into a current signal; the voltage dividing unit is connected with the rotating speed velometer and is configured to convert the current signal into a voltage signal.
In the implementation mode, the physical quantity of the motor rotating speed is converted into an electric signal, so that the measurement of the motor rotating speed of the raw material hoist is realized.
In one implementation manner of the first aspect, the rotation speed comparison module includes a first comparison resistor, a second comparison resistor, a feedback resistor, and a comparator; one end of the first comparison resistor receives the input voltage of the motor, and one end of the second comparison resistor receives the converted voltage signal; the other end of the first comparison resistor, the other end of the second comparison resistor and one end of the feedback resistor are all connected to the negative phase input end of the comparator, and the other end of the feedback resistor is connected with the output end of the comparator and used as the output end of control voltage.
In the implementation mode, the comparison analysis of the measured rotating speed and the expected rotating speed is realized from hardware through the comparator.
In one implementation manner of the first aspect, the motor of the raw material elevator is a three-phase motor, and three-phase stator winding wires of the motor are connected in a triangular mode; the rotational speeds include a first rotational speed, a second rotational speed, and a third rotational speed corresponding to the three-phase motor.
In one implementation manner of the first aspect, the system includes a first rotational speed measurement and control branch, a second rotational speed measurement and control branch, and a third rotational speed measurement and control branch; one end of the first rotational speed control branch is used as an input end of a first control voltage and is connected with a first phase of the motor, and the other end of the first rotational speed control branch is connected with a first measuring point of the rotational speed measuring module; one end of the second rotating speed measurement and control branch is used as an input end of a second control voltage and is connected with a second phase of the motor, and the other end of the second rotating speed measurement and control branch is connected with a second measuring point of the rotating speed measuring module; one end of the third rotation speed measurement and control branch is used as an input end of a third control voltage and is connected with a third phase of the motor, and the other end of the third rotation speed measurement and control branch is connected with a third measuring point of the rotation speed measuring module.
In this implementation mode, to three-phase motor, can adjust the control voltage of each looks for the operation of three-phase motor in the raw materials lifting machine is more steady.
In one implementation manner of the first aspect, the system further includes: a proportional-integral-derivative adjusting module; the integral circuit formed by the rotating speed measuring module, the rotating speed comparing module and the voltage control module is used as an open loop transfer function, is connected with the proportional-integral-derivative regulating module and receives regulating parameters output by the proportional-integral-derivative regulating module; and the motor rotating speed output by the open-loop transfer function is fed back to the comparison link to be compared with the input rotating speed, so that closed-loop regulation is formed.
In an implementation manner of the first aspect, in response to the motor rotation speed output by the open loop transfer function being the same as the expected rotation speed, but the vibration amplitude of the motor starting process exceeds a preset value, the pid adjustment module introduces a pid controller; in response to the vibration amplitude of the motor starting process not exceeding the preset value, the motor rotating speed output by the open loop transfer function is lower than the expected rotating speed, and the proportional-integral-differential regulating module introduces a proportional-integral controller; and in response to the vibration amplitude of the motor starting process exceeding the preset value, the motor rotating speed output by the open loop transfer function is lower than the expected rotating speed, and the proportional-integral-derivative regulating module introduces a proportional-integral-derivative controller.
In the implementation mode, the running stability of the raw material hoister is better ensured by combining hardware and software PID (Proportional Integral Derivative ) adjustment.
In a second aspect, the present application provides a method for monitoring the speed of a feedstock elevator, the method comprising: measuring the rotating speed of a motor in the raw material hoister; comparing the rotating speed with an expected rotating speed, and determining a comparison result; adjusting the control voltage of a motor in the raw material elevator according to the comparison result; responsive to the rotational speed being higher than the desired rotational speed in the comparison, reducing a control voltage of the motor; and in response to the rotational speed being lower than the desired rotational speed in the comparison result, increasing a control voltage of the motor.
In one implementation manner of the second aspect, the method further includes: and performing proportional-integral-derivative adjustment on the rotating speed.
In an implementation manner of the second aspect, the step of performing a proportional-integral-derivative adjustment on the rotation speed includes: responding to the motor rotation speed output after the control voltage is adjusted to be the same as the expected rotation speed, and introducing a proportional-differential controller when the vibration amplitude of the motor in the starting process exceeds a preset value; in response to the vibration amplitude of the motor starting process not exceeding the preset value, the motor rotating speed output after the control voltage is adjusted is lower than the expected rotating speed, and a proportional-integral controller is introduced; and in response to the vibration amplitude of the motor starting process exceeding the preset value, the motor rotating speed output after the control voltage is adjusted is lower than the expected rotating speed, and a proportional-integral-derivative controller is introduced.
As described above, the speed monitoring system and method for the raw material elevator disclosed by the application have the following beneficial effects:
the method for dynamically monitoring and controlling the rotating speed is adopted, the control voltage of the motor can be adjusted according to the running speed condition of the raw material elevator through circuit feedback, the control voltage of the motor is reduced when the rotating speed of the elevator motor deviates from the expected rotating speed and becomes high, and the control voltage of the motor is increased when the rotating speed of the elevator motor deviates from the expected rotating speed and becomes low, so that the elevator can keep uniform speed when conveying raw materials, the problem that the raw materials are scattered from high altitude due to abnormal lifting speed is avoided, and compared with the prior art, the method for controlling the speed of the raw material elevator mainly depends on the start and stop of the PLC remote control motor, the problem of vibration of a material frame of the elevator caused by the start and stop of the motor can be effectively reduced, the storage efficiency of the raw material is greatly improved, and the service life of the motor is prolonged to a certain extent.
According to the method, the PID correction adjustment is added through the combination of hardware adjustment and software adjustment, and PID parameters can be automatically and timely adjusted through comprehensive analysis of the rotating speed time domain, the open-loop frequency domain and the closed-loop frequency domain of the elevator by a computer, so that the elevator is stabilized at a required speed.
Drawings
Fig. 1 is a schematic structural diagram of a speed monitoring system of a raw material hoist according to an embodiment of the present application.
Fig. 2 is a schematic circuit connection diagram of a speed monitoring system of a raw material hoist according to an embodiment of the present application.
Fig. 3 is a schematic diagram of a three-phase motor of the speed monitoring system of the raw material hoist according to the embodiment of the application.
Fig. 4 is a schematic diagram of a control structure of a speed monitoring system of a raw material hoist according to an embodiment of the present application.
Fig. 5 is a schematic control diagram of a speed monitoring system of a raw material hoist according to an embodiment of the present application.
Fig. 6 shows a control system block diagram of a speed monitoring system for a material hoist according to an embodiment of the present application.
Fig. 7 shows a first response graph of a speed monitoring system for a material hoist according to an embodiment of the present application.
Fig. 8 shows a second response graph of the speed monitoring system of the material hoist according to the embodiment of the present application.
Fig. 9 shows a third response graph of the speed monitoring system of the material hoist according to the embodiment of the present application.
Fig. 10 shows a stator winding wiring diagram of a speed monitoring system for a material hoist according to an embodiment of the present application.
Fig. 11 is a diagram showing a physical model of the motor stator winding and rotor of the speed monitoring system of the material hoist according to the embodiment of the present application.
Fig. 12 is a diagram showing a circuit mechanical physical model of the speed monitoring system of the raw material hoist according to the embodiment of the present application.
Fig. 13 is a schematic flow chart of a speed monitoring method of a raw material hoist according to an embodiment of the present application.
Description of element reference numerals
1. Speed monitoring system of raw material hoister
11. Rotational speed measuring module
12. Rotational speed comparison module
13. Voltage control module
14. Proportional-integral-differential regulating module
S11 to S13 steps
Detailed Description
Other advantages and effects of the present application will become apparent to those skilled in the art from the present disclosure, when the following description of the embodiments is taken in conjunction with the accompanying drawings. The present application may be embodied or carried out in other specific embodiments, and the details of the present application may be modified or changed from various points of view and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict.
It should be noted that, the illustrations provided in the following embodiments merely illustrate the basic concepts of the application by way of illustration, and only the components related to the application are shown in the drawings and are not drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of the components in actual implementation may be arbitrarily changed, and the layout of the components may be more complex.
Referring to fig. 1, a schematic structural diagram of a speed monitoring system of a raw material hoist according to an embodiment of the present application is shown. As shown in fig. 1, a speed monitoring system 1 of a raw material hoist according to the present application includes: a rotation speed measuring module 11, a rotation speed comparing module 12 and a voltage control module 13.
The rotational speed measuring module 11 is configured to measure the rotational speed of the motor in the raw material hoist.
The rotation speed comparison module 12 is connected to the rotation speed measurement module 11 and is configured to compare the rotation speed with a desired rotation speed and determine a comparison result.
The voltage control module 13 is connected with the rotating speed comparison module 12 and is configured to adjust the control voltage of the motor in the raw material elevator according to the comparison result; responsive to the rotational speed being higher than the desired rotational speed in the comparison, reducing a control voltage of the motor; and in response to the rotational speed being lower than the desired rotational speed in the comparison result, increasing a control voltage of the motor.
Referring to fig. 2, a schematic circuit connection diagram of a speed monitoring system of a raw material hoist according to an embodiment of the present application is shown. As shown in fig. 2, the rotation speed measuring module 11 includes a rotation speed velometer and a voltage dividing unit.
The rotational speed velometer is mechanically connected with the motor of the raw material elevator and is configured to convert the rotational speed of the motor in the raw material elevator into a current signal.
The voltage dividing unit is connected with the tachometer and is configured to convert the current signal into a voltage signal, such as R in figure 2 3 And R is 4 A voltage dividing unit is formed.
With continued reference to fig. 2, the rotation speed comparison module includes a first comparison resistor R 1 A second comparison resistor R 1’ Feedback resistor R 2 Sum comparator U 1 . Wherein, the first comparisonResistor R 1 And a second comparison resistor R 1’ The resistor has the same resistance and specification.
The first comparison resistor R 1 Receives an input voltage U of the motor L11 The second comparison resistor R 1’ Receives the converted voltage signal.
The first comparison resistor R 1 The other end of the second comparison resistor R 1’ Both the other end of the feedback resistor and the other end of the feedback resistor are connected to the comparator U 1 The negative phase input end of the feedback resistor R 2 Is connected with the other end of the comparator U 1 Is connected as control voltage U L1 Is provided.
Specifically, the glass raw material elevator speed detection single-phase control may be as shown in fig. 2. Taking a single phase as an example, the rotational speed velometer measures the rotational speed of the raw material hoist motor and outputs corresponding current, and the current feedback is compared with the input current to control the raw material hoist motor. Output voltage U of speed measuring device Measuring Proportional to the measured rotation speed W, i.e. U Measuring ＝K n W, where K n Is a proportional coefficient, according to kirchhoff current law U i /R 1 -U Measurement of (R 4 /R 3 +R 4 )/R 1 ＝U L1 /R 2 As can be obtained from the expression, when the motor rotation speed W becomes large, U Measuring Become large, U L1 Becoming smaller; when the motor rotation speed W becomes smaller, U Measuring Becomes smaller, U L1 And becomes larger.
Referring to fig. 3, a schematic circuit diagram of a three-phase motor of a speed monitoring system of a raw material hoist according to an embodiment of the present application is shown. As shown in fig. 3, the motor of the raw material hoist is a three-phase motor, the three-phase stator winding wires are connected in a triangle manner, and as shown in fig. 10, the voltages between the two wires are respectively U L1 、U L2 、U L3 。
Further, a physical model between one of the stator windings and the rotor of the three-phase motor is shown in fig. 11. Because the three-phase electricity has phase difference, U can not be set L1 >U L2 Form a potential difference, fixThe stator windings are connected with current to generate magnetic field, the rotor cuts magnetic induction lines in the magnetic field generated by the stator windings to generate current, the charged rotor is forced in a magnetic field to generate a torque T. Torque T is proportional to rotor winding current i, i.e., t=k×i, where k is a proportional coefficient.
Further, the circuit and mechanical physical model of the motor is shown as U in figure 12 L1 、U L2 The phase voltage R, L of the stator winding is the winding impedance, E is the motor electromotive force, E is proportional to the motor speed W, i.e. E= keW, where ke is the proportional coefficient, T d Is the load torque. Let ui=u L1 —U L2 The current in the loop is i, the moment of inertia of the rotor is J, and UI=iR+L di/dt+E is obtained according to kirchhoff voltage law; according to newton's law of kinematics, J dw/dt=t+t is derived d 。
The rotational speeds include a first rotational speed, a second rotational speed, and a third rotational speed corresponding to the three-phase motor.
With continued reference to fig. 3, the system includes a first rotational speed measurement and control branch, a second rotational speed measurement and control branch, and a third rotational speed measurement and control branch. Specifically, the first transfer speed control branch is U Measurement 1 The branch where the second rotation speed measurement and control branch is U Measurement 2 The branch where the third rotation speed measurement and control branch is U Measurement 3 The branch is located.
One end of the first speed-transferring control branch is used as the input end of the first control voltage and is connected with the first phase of the motor, as R in figure 3 12 The right end is connected with the connecting end of the raw material elevator motor; the other end of the first rotational speed control branch is connected with a first measuring point U of a rotational speed measuring module (rotational speed velometer) Measurement 1 And (5) connection.
One end of the second rotation speed measurement and control branch is used as an input end of a second control voltage and is connected with a second phase of the motor, as R in figure 3 22 The right end is connected with the connecting end of the raw material elevator motor; the other end of the second rotation speed measurement and control branch and a second measurement point U of a rotation speed measurement module (rotation speed velometer) Measurement 2 And (5) connection.
One end of the third rotation speed measurement and control branch is used as an input end of a third control voltage and is connected with a third phase of the motorAs R in FIG. 3 32 The right end is connected with the connecting end of the raw material elevator motor; the other end of the third rotation speed measurement and control branch and a third measurement point U of a rotation speed measurement module (rotation speed velometer) Measurement 3 And (5) connection.
Three paths of voltages U are output by the rotating speed velometer 1 part of test, U Measuring 2, U Measurement 3 Respectively with the input voltage U of the corresponding item L11 、U L21 、U L31 And comparing to obtain the control voltage of the raw material lifting motor.
Referring to fig. 4, a schematic diagram of a control structure of a speed monitoring system of a raw material hoist according to an embodiment of the present application is shown. As shown in fig. 4, the speed monitoring system 1 of the raw material hoist further includes: a proportional-integral-derivative adjustment module 14;
the integral circuit formed by the rotating speed measuring module 11, the rotating speed comparing module 12 and the voltage control module 13 is used as an open loop transfer function, is connected with the proportional integral derivative regulating module 14 and receives regulating parameters output by the proportional integral derivative regulating module 14.
Referring to fig. 5, a schematic control diagram of a speed monitoring system of a raw material hoist according to an embodiment of the present application is shown. As shown in FIG. 5, the open loop transfer function G P (S) the output motor rotation speed W is fed back to the comparison link and the input rotation speed voltage U L11 The comparison is made, resulting in a closed loop adjustment. Therefore, PID computer control is added, and the computer can be used for comprehensively analyzing the time domain, the open-loop frequency domain, the closed-loop frequency domain and the like of the response, so that the optimal PID control method can be adopted for better realizing the stability, the rapidity and the accuracy of the operation of the glass raw material hoister.
A control system block diagram is available from all the equations above, as shown in fig. 6. Open loop transfer function G of control system is available according to control system block diagram P (S). Further, a response curve can be obtained according to the time domain response relation of the output rotating speed W and the time t.
In an embodiment, the specific regulation and control process of the pid control module is as follows:
and responding to the motor rotating speed output by the open loop transfer function to be the same as the expected rotating speed, wherein the vibration amplitude of the motor starting process exceeds a preset value, and the proportional-integral-derivative regulating module is introduced into a proportional-derivative controller.
Referring to fig. 7, a first response graph of a speed monitoring system for a material hoist according to an embodiment of the present application is shown. As shown in fig. 7, in the left side diagram, the final state of the output motor rotation speed is the same as the expected rotation speed value, but there is a large vibration during the starting process. At this time, a PD controller may be introduced, and the correction effect is a curve shown in the right-hand graph.
And in response to the vibration amplitude of the motor starting process not exceeding the preset value, the motor rotating speed output by the open loop transfer function is lower than the expected rotating speed, and the proportional-integral-differential regulating module introduces a proportional-integral controller.
Referring to fig. 8, a second response graph of the speed monitoring system of the material hoist according to the embodiment of the present application is shown. As shown in fig. 8, in the left-hand diagram, there is no large vibration during the start-up, but the output rotation speed final value is lower than the desired rotation speed value. At this time, a PI controller may be introduced, and the correction effect is a curve shown in the right graph.
And in response to the vibration amplitude of the motor starting process exceeding the preset value, the motor rotating speed output by the open loop transfer function is lower than the expected rotating speed, and the proportional-integral-derivative regulating module introduces a proportional-integral-derivative controller.
Referring to fig. 9, a third response chart of the speed monitoring system of the material hoister according to the embodiment of the application is shown. As shown in fig. 9, in the left-hand graph, there is a large vibration during the start-up process and the output final value is lower than the desired value. At this time, a PID controller may be introduced, and the correction result is a curve shown in the right graph.
It should be noted that, the preset value refers to a threshold value describing the magnitude of the vibration amplitude in the motor starting process, and an appropriate value can be set according to the actual scene requirement to distinguish whether the vibration amplitude is larger or not.
Referring to fig. 13, a schematic flow chart of a speed monitoring method of a raw material hoist according to an embodiment of the present application is shown. As shown in fig. 13, the speed monitoring method of the raw material hoister specifically comprises the following steps:
s11, measuring the rotating speed of a motor in the raw material elevator.
And S12, comparing the rotating speed with an expected rotating speed, and determining a comparison result.
S13, adjusting the control voltage of a motor in the raw material elevator according to the comparison result; responsive to the rotational speed being higher than the desired rotational speed in the comparison, reducing a control voltage of the motor; and in response to the rotational speed being lower than the desired rotational speed in the comparison result, increasing a control voltage of the motor.
In one embodiment, the method further comprises: and performing proportional-integral-derivative adjustment on the rotating speed.
Further, the step of performing a pid adjustment on the rotational speed includes:
and responding to the motor rotating speed output after the control voltage is adjusted to be the same as the expected rotating speed, and introducing a proportional-differential controller when the vibration amplitude of the motor in the starting process exceeds a preset value.
And in response to the vibration amplitude of the motor starting process not exceeding the preset value, the motor rotating speed output after the control voltage is adjusted is lower than the expected rotating speed, and a proportional-integral controller is introduced.
And in response to the vibration amplitude of the motor starting process exceeding the preset value, the motor rotating speed output after the control voltage is adjusted is lower than the expected rotating speed, and a proportional-integral-derivative controller is introduced.
The protection scope of the speed monitoring method of the raw material hoister is not limited to the execution sequence of the steps listed in the embodiment, and all the schemes of step increase and decrease and step replacement in the prior art according to the principles of the application are included in the protection scope of the application.
The speed monitoring system of the raw material elevator can realize the speed monitoring method of the raw material elevator, but the implementation device of the speed monitoring method of the raw material elevator comprises but is not limited to the structure of the speed monitoring system of the raw material elevator listed in the embodiment, and all structural deformation and replacement of the prior art according to the principles of the application are included in the protection scope of the application.
In the several embodiments provided in this application, it should be understood that the disclosed system or method may be implemented in other ways. For example, the system embodiments described above are merely illustrative, e.g., the division of modules/units is merely a logical functional division, and there may be additional divisions when actually implemented, e.g., multiple modules or units may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or modules or units, which may be in electrical, mechanical or other forms.
The modules/units illustrated as separate components may or may not be physically separate, and components shown as modules/units may or may not be physical modules, i.e., may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules/units may be selected according to actual needs to achieve the purposes of the embodiments of the present application. For example, functional modules/units in various embodiments of the present application may be integrated into one processing module, or each module/unit may exist alone physically, or two or more modules/units may be integrated into one module/unit.
Those of ordinary skill would further appreciate that the elements and algorithm steps of the examples described in connection with the embodiments disclosed herein may be embodied in electronic hardware, in computer software, or in a combination of the two, and that the elements and steps of the examples have been generally described in terms of function in the foregoing description to clearly illustrate the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
The descriptions of the processes or structures corresponding to the drawings have emphasis, and the descriptions of other processes or structures may be referred to for the parts of a certain process or structure that are not described in detail.
The foregoing embodiments are merely illustrative of the principles of the present application and their effectiveness, and are not intended to limit the application. Modifications and variations may be made to the above-described embodiments by those of ordinary skill in the art without departing from the spirit and scope of the present application. Accordingly, it is intended that all equivalent modifications and variations which may be accomplished by persons skilled in the art without departing from the spirit and technical spirit of the disclosure be covered by the claims of this application.
Claims (10)
1. A system for monitoring the speed of a material hoist, the system comprising:
the rotating speed measuring module is configured to measure the rotating speed of the motor in the raw material hoister;
the rotating speed comparison module is connected with the rotating speed measurement module and is configured to compare the rotating speed with the expected rotating speed and determine a comparison result;
the voltage control module is connected with the rotating speed comparison module and is configured to adjust the control voltage of the motor in the raw material hoister according to the comparison result; responsive to the rotational speed being higher than the desired rotational speed in the comparison, reducing a control voltage of the motor; and in response to the rotational speed being lower than the desired rotational speed in the comparison result, increasing a control voltage of the motor.
2. The system of claim 1, wherein the tachometer module comprises a tachometer and a voltage divider unit;
the rotating speed velometer is mechanically connected with a motor of the raw material elevator and is configured to convert the rotating speed of the motor in the raw material elevator into a current signal;
the voltage dividing unit is connected with the rotating speed velometer and is configured to convert the current signal into a voltage signal.
3. The system of claim 2, wherein the rotational speed comparison module comprises a first comparison resistor, a second comparison resistor, a feedback resistor, and a comparator;
one end of the first comparison resistor receives the input voltage of the motor, and one end of the second comparison resistor receives the converted voltage signal;
the other end of the first comparison resistor, the other end of the second comparison resistor and one end of the feedback resistor are all connected to the negative phase input end of the comparator, and the other end of the feedback resistor is connected with the output end of the comparator and used as the output end of control voltage.
4. The system of claim 1, wherein the motor of the material hoist is a three-phase motor with three-phase stator winding connections connected in a delta configuration;
the rotational speeds include a first rotational speed, a second rotational speed, and a third rotational speed corresponding to the three-phase motor.
5. The system of claim 4, wherein the system comprises a first rotational speed measurement and control branch, a second rotational speed measurement and control branch, and a third rotational speed measurement and control branch;
one end of the first rotational speed control branch is used as an input end of a first control voltage and is connected with a first phase of the motor, and the other end of the first rotational speed control branch is connected with a first measuring point of the rotational speed measuring module;
one end of the second rotating speed measurement and control branch is used as an input end of a second control voltage and is connected with a second phase of the motor, and the other end of the second rotating speed measurement and control branch is connected with a second measuring point of the rotating speed measuring module;
one end of the third rotation speed measurement and control branch is used as an input end of a third control voltage and is connected with a third phase of the motor, and the other end of the third rotation speed measurement and control branch is connected with a third measuring point of the rotation speed measuring module.
6. The system of claim 1, wherein the system further comprises: a proportional-integral-derivative adjusting module;
the integral circuit formed by the rotating speed measuring module, the rotating speed comparing module and the voltage control module is used as an open loop transfer function, is connected with the proportional-integral-derivative regulating module and receives regulating parameters output by the proportional-integral-derivative regulating module;
and the motor rotating speed output by the open-loop transfer function is fed back to the comparison link to be compared with the input rotating speed, so that closed-loop regulation is formed.
7. The system according to claim 6, wherein:
responding to the motor rotating speed output by the open loop transfer function to be the same as the expected rotating speed, wherein the vibration amplitude of the motor starting process exceeds a preset value, and the proportional-integral-derivative regulating module introduces a proportional-derivative controller;
in response to the vibration amplitude of the motor starting process not exceeding the preset value, the motor rotating speed output by the open loop transfer function is lower than the expected rotating speed, and the proportional-integral-differential regulating module introduces a proportional-integral controller;
and in response to the vibration amplitude of the motor starting process exceeding the preset value, the motor rotating speed output by the open loop transfer function is lower than the expected rotating speed, and the proportional-integral-derivative regulating module introduces a proportional-integral-derivative controller.
8. A method for monitoring the speed of a raw material hoist, the method comprising:
measuring the rotating speed of a motor in the raw material hoister;
comparing the rotating speed with an expected rotating speed, and determining a comparison result;
adjusting the control voltage of a motor in the raw material elevator according to the comparison result; responsive to the rotational speed being higher than the desired rotational speed in the comparison, reducing a control voltage of the motor; and in response to the rotational speed being lower than the desired rotational speed in the comparison result, increasing a control voltage of the motor.
9. The method of claim 8, wherein the method further comprises: and performing proportional-integral-derivative adjustment on the rotating speed.
10. The method of claim 9, wherein the step of performing a proportional-integral-derivative adjustment of the rotational speed comprises:
responding to the motor rotation speed output after the control voltage is adjusted to be the same as the expected rotation speed, and introducing a proportional-differential controller when the vibration amplitude of the motor in the starting process exceeds a preset value;
in response to the vibration amplitude of the motor starting process not exceeding the preset value, the motor rotating speed output after the control voltage is adjusted is lower than the expected rotating speed, and a proportional-integral controller is introduced;
and in response to the vibration amplitude of the motor starting process exceeding the preset value, the motor rotating speed output after the control voltage is adjusted is lower than the expected rotating speed, and a proportional-integral-derivative controller is introduced.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311332566.XA CN117375479A (en) | 2023-10-13 | 2023-10-13 | Speed monitoring system and method for raw material hoister |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311332566.XA CN117375479A (en) | 2023-10-13 | 2023-10-13 | Speed monitoring system and method for raw material hoister |
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| Publication Number | Publication Date |
|---|---|
| CN117375479A true CN117375479A (en) | 2024-01-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311332566.XA Pending CN117375479A (en) | 2023-10-13 | 2023-10-13 | Speed monitoring system and method for raw material hoister |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117375479A (en) |
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2023
- 2023-10-13 CN CN202311332566.XA patent/CN117375479A/en active Pending
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