Encoderless high-precision control method and system

Abstract

The application discloses a high-precision control method without an encoder, comprising the following steps: observing various transmission parameter set values according to actual production over-steel conditions; simultaneously reading field encoder speed feedback values and encoder calculation values through a real-time data acquisition system, and comparing the values in real time; switching the speed control point of the transmission parameter from the field encoder data feedback value control to the encoder calculation value control; and observing the field motor operation condition after switching the control system. The high-precision control method without an encoder provided by the application adopts the transmission cabinet CU unit encoder calculation value to perform closed-loop accurate control, eliminates the problem that the production is restricted by long-time fault time caused by encoder faults and replacement of the encoder, meets the rolling production control precision requirement, reduces the encoder hardware configuration and complexity, reduces the encoder maintenance cost and spare part cost, enhances the noise resistance of the system, and further improves the stability and reliability of the rolling production operation.

Description

Technical Field

[0001] This invention relates to the field of encoderless high-precision control technology, specifically to an encoderless high-precision control method and system. Background Technology

[0002] Encoders play a crucial role in the electrical control system of rolling mills, performing functions such as speed control, position control, and bar length measurement. Incremental speed encoders are used on the main motors in the rolling mill. These encoders are all mounted on the tail shaft of the drive motor, with a 1:1 speed ratio to the motor's output speed. Each encoder has a corresponding electrical drive cabinet providing 24VDC power. The encoder's corresponding output channel is connected to the processor's input module. The application software configures the processor's input module, inputting the actual encoder output value into the program. The software module receives the input value, processes the data, and applies it to the appropriate stages to achieve speed control. However, in actual rolling operations, encoders experience a high failure rate and require frequent replacements. Furthermore, because all encoders are mounted on the tail shaft of the drive motor, issues such as the motor's structure necessitate the removal and reassembly of the main motor's axial cooling fan using a crane before encoder replacement can be performed, resulting in lengthy troubleshooting times for each encoder failure. The high frequency of encoder failures also leads to high costs for encoder spare parts.

[0003] Due to the complex on-site working conditions, the signal transmission line from the transmission cabinet to the field encoder is long and subject to significant interference, which can easily cause signal distortion, resulting in insufficient control accuracy. This seriously affects the normal production operation of rolling, thereby impacting the effective rolling rate and the yield of the product.

[0004] Therefore, there is an urgent need for a high-precision control method without encoders to eliminate the problem of production constraints caused by encoder failure and the long downtime caused by encoder replacement, and to achieve high-precision control without encoders. Summary of the Invention

[0005] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0006] In view of the above-mentioned problems, the present invention is proposed.

[0007] Therefore, the technical problem solved by the present invention is that the existing motor encoder control method cannot solve the problem of the impact on the stable operation of rolling caused by frequent encoder failures and long encoder replacement time, as well as the problem of production being restricted by the long downtime caused by encoder failures and encoder replacement.

[0008] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a high-precision control method without an encoder, comprising:

[0009] Based on actual steel production conditions, observe the set values ​​of various transmission parameters;

[0010] The system simultaneously reads and compares the encoder speed feedback value and the encoder calculation value in real time using a real-time data acquisition system.

[0011] Switch the speed control point of the transmission parameters from control by the field encoder data feedback value to control by the encoder calculation value. After switching the control system, observe the operation of the motor on site.

[0012] As a preferred embodiment of the encoderless high-precision control method of the present invention, the parameter setting values ​​include:

[0013] The speed, linear speed, torque of the rolling mill, and the on-site rolling and pulling relationship are adjusted to control the speed and output torque of the transmission.

[0014] The real-time data acquisition includes real-time data acquisition through a PDA real-time data acquisition system, and data comparison between the calculated value of the transmission encoder and the actual encoder feedback value.

[0015] As a preferred embodiment of the encoderless high-precision control method of the present invention, the real-time comparison includes:

[0016] Ensure that data fluctuations are less than 0.5%;

[0017] When the fluctuation of the encoder's calculated data is less than 0.5%, the data is considered to be stable and meets the conditions for switching the control system.

[0018] When the encoder's calculated data fluctuation is ≥0.5% and <1%, the setting parameters will continue to be automatically adjusted until the data fluctuation is less than 0.5%.

[0019] When the encoder's calculated data fluctuation is ≥1%, it is considered that the data fluctuation is too large, which may cause steel to pile up or be pulled during the rolling process, resulting in dimensional problems of the rolled product. The operator needs to manually adjust the parameters to reduce the data fluctuation to <0.5%.

[0020] As a preferred embodiment of the encoderless high-precision control method of the present invention, the observation of the on-site motor operation includes:

[0021] After the real-time comparison between the speed feedback value and the encoder calculation value is completed, in order to ensure that the on-site steel rolling process does not experience abnormal fluctuations due to motor speed fluctuations, the on-site motor operation is observed and compared again to ensure that the data fluctuation is less than 0.5%. The operator at the control panel observes the operational stability and accuracy.

[0022] If the fluctuation of the encoder's calculated data is less than 0.5%, the requirement is met, and the next step is executed.

[0023] If the encoder's calculated data fluctuation is ≥0.5%, the requirement is not met, and the automatic adjustment of the transmission speed setting will continue until the data fluctuation is ensured to be <0.5%.

[0024] As a preferred embodiment of the encoderless high-precision control method of the present invention, the observation of the on-site motor operation includes:

[0025] Cancel the encoder hardware configuration of the motor drive system and exit the actual encoder control mode in the parameter settings to ensure stable operating parameters.

[0026] As a preferred embodiment of the encoderless high-precision control method of the present invention, ensuring stable operating parameters includes:

[0027] If there are no abnormalities in the motor on site, the requirements are met and the process ends.

[0028] When there is an abnormality in the motor on site, a comprehensive analysis and judgment are made, the setting parameters are modified, and the analysis and judgment are repeated until there is no abnormality in the motor on site.

[0029] As a preferred embodiment of the encoderless high-precision control method of the present invention, the method of ensuring data fluctuation includes: the data fluctuation is the fluctuation between the actual rotational speed value and the set value.

[0030] The technical problem solved by this invention is that existing motor encoder control methods cannot solve the problems of frequent encoder failures and long encoder replacement times affecting the stable operation of rolling, as well as the problem of production being restricted by long downtime caused by encoder failures and encoder replacements.

[0031] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a high-precision control system without an encoder, characterized in that it comprises:

[0032] Speed ​​regulation module, transmission CU control module, automation control module;

[0033] The speed adjustment module is a device that keeps the speed of the drive motor and the load consistent. It is used to drive the motor and the load with a gearbox. The rotation of the motor drives the load roll to rotate. The linear speed of the roll rotation during rolling production is the linear speed of the steel rolling.

[0034] The transmission CU control module is a device for acquiring parameter setting values. It is used to drive the motor through a frequency conversion cable by collecting the current output current, torque and speed information values. It is connected by power cable and control cable. The transmission CU unit provides precise output control for the motor to operate a single motor.

[0035] The automated control module is a device for the automated overall coordination and control of the motors. It communicates with the transmission CU control module via network and uses status words for communication and transmission. The automated control system performs overall coordination and control of all motors on the entire line, and sets the speed of each motor to each transmission CU control unit, thereby achieving precise control of rolling on the rolling line.

[0036] A computer device includes a memory and a processor, the memory storing a computer program, characterized in that the processor executes the computer program to implement the steps of the method described above.

[0037] A computer-readable storage medium having a computer program stored thereon, characterized in that the computer program, when executed by a processor, implements the steps of the method described above.

[0038] The beneficial effects of this invention are as follows: The encoder-free high-precision control method provided by this invention successfully uses the encoder calculation values ​​of the CU unit in the transmission cabinet for closed-loop precise control of the main motors in the roughing, intermediate, and pre-finishing areas of the rolling mill. This eliminates the problem of production constraints caused by encoder failure and the long downtime resulting from encoder replacement. The control precision adopted by this method meets the control precision requirements of rolling production. It reduces encoder hardware configuration and complexity, lowers encoder maintenance and spare parts costs, enhances the system's noise immunity, and further improves the stability and reliability of rolling production operation. Attached Figure Description

[0039] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0040] Figure 1 This is an overall flowchart of an encoderless high-precision control method provided in one embodiment of the present invention;

[0041] Figure 2A flowchart of a parameter tuning method for an encoder-based control system in a high-precision control method without encoder provided in an embodiment of the present invention;

[0042] Figure 3 This is an overall structural diagram of a high-precision control system without an encoder provided in the second embodiment of the present invention;

[0043] Figure 4 This is a diagram illustrating the encoder control structure of a high-precision control system without an encoder, provided in the second embodiment of the present invention.

[0044] Figure 5 This is a diagram illustrating the overall structure of a high-precision control system without an encoder, provided in the second embodiment of the present invention, which uses a drive encoder to calculate the value for control.

[0045] Figure 6 Experimental diagrams showing the impact of data fluctuation on control accuracy in a high-precision control method without an encoder, provided in four embodiments of the present invention. Detailed Implementation

[0046] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0047] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0048] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0049] This invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of this invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not adhering to the usual scale. Furthermore, the schematic diagrams are merely examples and should not be construed as limiting the scope of protection of this invention. In actual fabrication, the three-dimensional spatial dimensions of length, width, and depth should be included.

[0050] Furthermore, in the description of this invention, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used solely for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. In addition, the terms "first," "second," or "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0051] Unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" in this invention should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; similarly, they can refer to mechanical connections, electrical connections, or direct connections, or indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0052] Example 1

[0053] Reference Figure 1-2 As an embodiment of the present invention, a high-precision control method without an encoder is provided, comprising:

[0054] Based on actual steel production conditions, observe the set values ​​of various transmission parameters.

[0055] The system uses a real-time data acquisition system to simultaneously read the encoder speed feedback value and the encoder calculation value for real-time comparison.

[0056] Switch the speed control point of the transmission parameters from control by the field encoder data feedback value to control by the encoder calculation value. After switching the control system, observe the operation of the motor on site.

[0057] The parameter settings include: the mill's operating speed, linear speed, torque, on-site rolling and stacking relationship, and the speed and output torque of the transmission settings.

[0058] The real-time data acquisition includes real-time data acquisition through a PDA real-time data acquisition system, and data comparison between the calculated value of the transmission encoder and the actual encoder feedback value.

[0059] Real-time comparison includes ensuring that data fluctuations are less than 0.5%.

[0060] Data fluctuation refers to the fluctuation between the actual speed value and the set value, expressed as:

[0061] n = (n1 - n2) / n2

[0062] Where n1 represents the actual speed value and n2 represents the speed set value.

[0063] If the motor speed is set to 1000 rpm, the actual speed is allowed to fluctuate within the range of 995 to 1005 rpm. This fluctuation is less than 0.5%, which can ensure high-precision control of the rolling line production operation.

[0064] When the fluctuation of the encoder's calculated data is less than 0.5%, the data is considered to be stable and meets the conditions for switching the control system.

[0065] When the encoder's calculated data fluctuation is ≥0.5% and <1%, the setting parameters will continue to be automatically adjusted until the data fluctuation is less than 0.5%.

[0066] When the encoder's calculated data fluctuation is ≥1%, it is considered that the data fluctuation is too large, which may cause steel to pile up or be pulled during the rolling process, resulting in dimensional problems of the rolled product. The operator needs to manually adjust the parameters to reduce the data fluctuation to <0.5%.

[0067] The observation of the motor operation on site includes: after the real-time comparison between the speed feedback value and the encoder calculation value is completed, in order to ensure that the on-site steel rolling process does not cause abnormal fluctuations due to motor speed fluctuations, the on-site motor operation is observed and compared again to ensure that the data fluctuation is less than 0.5%. The operator observes the stability and accuracy of the operation.

[0068] If the encoder's calculated data fluctuation is less than 0.5%, the requirement is met, and the next step is executed; if the encoder's calculated data fluctuation is greater than or equal to 0.5%, the requirement is not met, and the automatic adjustment of the transmission speed setting continues until the data fluctuation is ensured to be less than 0.5%.

[0069] Observing the on-site motor operation includes: canceling the encoder hardware configuration of the motor drive system and exiting the actual encoder control mode in the parameter settings to ensure stable operating parameters.

[0070] Ensuring stable operating parameters includes: when there are no abnormalities in the on-site motor, the requirements are met, and the process ends;

[0071] When there is an abnormality in the motor on site, a comprehensive analysis and judgment are made, the setting parameters are modified, and the analysis and judgment are repeated until there is no abnormality in the motor on site.

[0072] After implementing the above steps, the main motors in the roughing, intermediate, and pre-finishing rolling areas of the rolling mill were successfully controlled in a closed-loop manner using encoder calculations from the CU unit of the drive cabinet. This eliminated the problem of production constraints caused by encoder failures and the need for encoder replacements, and the control precision achieved by this method met the requirements for rolling production control accuracy. It reduced encoder hardware configuration and complexity, lowered encoder maintenance and spare parts costs, enhanced the system's noise immunity, and further improved the stability and reliability of rolling production operations.

[0073] Based on the encoder control system parameter tuning method of the transmission CU unit, the actual parameters are adjusted through this tuning method, thereby achieving high-precision control without encoder.

[0074] Example 2

[0075] Reference Figure 3-5 As an embodiment of the present invention, a customer service voice analysis system is provided, including: a speed adjustment module 100, a transmission CU control module 200, and an automation control module 300.

[0076] The speed adjustment module 100 is a device that keeps the speed of the drive motor and the load consistent. It is used to drive the motor and the load with a gearbox. The rotation of the motor drives the load roll to rotate. During the rolling production, the linear speed of the roll rotation is the linear speed of the steel rolling.

[0077] The transmission CU control module 200 is a device for acquiring parameter setting values. It is used to drive the motor through a frequency conversion cable by collecting the current output current, torque and speed information values. It is connected by power cable and control cable. The transmission CU unit provides precise output control for the motor to operate a single motor.

[0078] The automated control module 300 is a device for automated overall coordination control of the motors. It communicates with the transmission CU control module 200 via network and uses status words for communication transmission. The automated control system performs overall coordination control of all motors on the entire line, and sets the speed of each motor to each transmission CU control unit, thereby achieving precise control of rolling on the rolling line.

[0079] like Figure 4 The diagram shown is a schematic of the original motor encoder control. As can be seen, the motor encoder achieves speed feedback closed-loop control by feeding back values ​​from the motor's operation to the transmission CU control unit. Figure 5 The diagram shows a control scheme that uses the calculated value of the drive encoder to replace the actual encoder feedback value on site. The motor operation control uses the calculated value of the drive encoder, which can remove the relevant configuration hardware of the on-site encoder, fundamentally solving the problem of frequent encoder failures and long encoder replacement time affecting the stable operation of rolling.

[0080] Example 3

[0081] The third embodiment of the present invention differs from the first two embodiments in that:

[0082] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this invention, essentially, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0083] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device.

[0084] More specific examples of computer-readable media (a non-exhaustive list) include: electrical connections (electronic devices) having one or more wires, portable computer disk drives (magnetic devices), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Furthermore, computer-readable media can even be paper or other suitable media on which the program can be printed, because the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in computer memory.

[0085] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0086] Example 4

[0087] Reference Figure 6 As an embodiment of the present invention, a desulfurization data analysis method based on data mining is provided. In order to verify the beneficial effects of the present invention, scientific demonstration is carried out through economic benefit calculation and simulation experiments.

[0088] To better verify the control capability of the encoderless system, data from Unit 6 of a power plant from May 2020 to March 2022 was used as the test set for verification. Historical data was collected every 10 minutes. Considering unit start-up and shutdown issues, data from units that were shut down were removed during data preprocessing to verify the experimental results.

[0089] In this embodiment, a specific application experiment of the method of the present invention is conducted under the same pre-set experimental environment, such as... Figure 6 As shown, simulation experiments were conducted based on different data fluctuation levels, with a total of 10 sets of simulation experiments. Finally, based on the accuracy, the data fluctuation level was determined to be 0.5%.

[0090] After implementing the encoder-free high-precision control method, all main motors on the rolling line successfully adopted closed-loop precise control using encoder calculation values ​​from the CU unit in the drive cabinet. This eliminated the production constraints caused by encoder failures and the resulting prolonged downtime due to encoder replacement. The control precision achieved by this method meets the requirements for rolling production control accuracy. It reduced encoder hardware configuration and complexity, lowering encoder maintenance and spare parts costs; it also enhanced the system's noise immunity, further improving the stability and reliability of rolling production. Simultaneously, encoder spare parts were replenished through a return process, reducing encoder and maintenance costs in the roughing, intermediate, and pre-finishing rolling areas of each line, further improving the stability and reliability of rolling operations. This upgrade reduced the encoder failure rate by 95%.

[0091] After implementing innovative upgrades for encoder-free high-precision control applications, the stability of equipment operation was effectively improved, and downtime was significantly reduced. Following the upgrade, encoder downtime on each line decreased by 50 minutes per month.

[0092] To improve maintenance efficiency, reduce repair costs, and decrease the number of maintenance personnel, the main motor encoder undergoes routine maintenance twice a month for 50 minutes, requiring 3 maintenance personnel. The entire plant utilizes encoderless high-precision control for 104 AC motors, reducing monthly routine maintenance days by: 104*3*50 / 60*2 / 8 = 65 working days.

[0093] Eliminating encoder installation reduces spare parts costs: From May 2020 to March 2022, the average frequency of main motor encoder replacement was 2 times per month per production line. The cost of a single encoder was 0.6 million yuan. The total spare parts cost saved across the seven production lines in the plant was: 7*2*0.6*12=1,008,000 yuan / year.

[0094] This invention directly uses the encoder calculation value of the transmission cabinet CU unit to control the speed of the main motor of the rolling mill, replacing the actual encoder feedback value for closed-loop control of the rolling mill. Thus, by removing the encoder-related hardware configuration after canceling the encoder hardware configuration, and meeting the rolling control accuracy requirements, this invention fundamentally solves the problems of frequent encoder failures and long encoder replacement time that affect the stable operation of rolling.

[0095] In practical use, it meets the actual production and operation requirements, strengthens the management and application of artificial intelligence automation, reduces operation and maintenance control costs, improves on-site operation safety, provides intelligent technical support, enhances customer service quality, reduces labor costs, and improves the quality and effectiveness of dispatching and command.

[0096] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A high-precision control method without an encoder, characterized in that, include: Based on actual steel production conditions, observe the set values ​​of various transmission parameters; The system simultaneously reads and compares the encoder speed feedback value and the encoder calculation value in real time using a real-time data acquisition system. Switch the speed control point of the transmission parameters from the field encoder data feedback value control to the encoder calculation value control, and observe the field motor operation after switching the control system. The real-time comparison includes: Ensure that data fluctuations are less than 0.5%; When the fluctuation of the encoder's calculated data is less than 0.5%, the data is considered to be stable and meets the conditions for switching the control system. When the encoder's calculated data fluctuation is ≥0.5% and <1%, the settings will continue to be automatically adjusted until the data fluctuation is less than 0.5%. When the encoder's calculated data fluctuation is ≥1%, it is considered that the data fluctuation is too large, which may cause steel to pile up or be pulled during the rolling process, resulting in dimensional problems of the rolled product. The operator needs to manually adjust the parameters to reduce the data fluctuation to <0.5%. The data fluctuation amount is ensured to include: the data fluctuation amount is the fluctuation between the actual rotational speed value and the set value; The observed motor operation status at the site includes: After the real-time comparison between the speed feedback value and the calculated value of the encoder is completed, in order to ensure that the on-site steel rolling process does not experience abnormal fluctuations due to motor speed fluctuations, the on-site motor operation is observed and compared again to ensure that the data fluctuation is less than 0.5%. The operator at the control panel observes the stability and accuracy of the operation. If the fluctuation of the encoder's calculated data is less than 0.5%, the requirement is met, and the next step is executed. If the encoder's calculated data fluctuation is ≥0.5%, the requirement is not met, and the automatic adjustment of the transmission speed setting will continue until the data fluctuation is ensured to be <0.5%. The observed motor operation status at the site includes: Cancel the encoder hardware configuration of the motor drive system and exit the control mode of actual encoder control in the parameter setting to ensure stable operating parameters; Ensuring stable operating parameters includes: If there are no abnormalities in the motor on site, the requirements are met and the process ends. When there is an abnormality in the motor on site, a comprehensive analysis and judgment are made, the setting parameters are modified, and the analysis and judgment are repeated until there is no abnormality in the motor on site.

2. The encoderless high-precision control method as described in claim 1, characterized in that, The parameter settings include: The speed, linear speed, torque of the rolling mill, and the on-site rolling and pulling relationship are adjusted to control the speed and output torque of the transmission. The real-time data acquisition includes real-time data acquisition through a PDA real-time data acquisition system, and data comparison between the calculated value of the transmission encoder and the actual encoder feedback value.

3. A high-precision control system without encoders, employing the high-precision control method without encoders as described in any one of claims 1 or 2, characterized in that, include: Speed ​​regulation module (100), transmission CU control module (200), automation control module (300); The speed adjustment module (100) is a device that keeps the speed of the drive motor and the load consistent. It is used to drive the motor and the load with a gearbox. The rotation of the motor drives the load roll to rotate. The linear speed of the roll rotation during rolling production is the linear speed of steel rolling. The transmission CU control module (200) is a device for acquiring parameter setting values. It is used to drive the motor through a frequency conversion cable by collecting the current output current, torque and speed information values. It is connected by power cable and control cable. The transmission CU unit is a single motor for precise motor operation output control. The automated control module (300) is a device for automated overall coordination control of the motor. It is used to communicate with the transmission CU control module (200) via network and to transmit communication using status words. The automated control system performs overall coordination control of all motors on the entire line and sets the speed of each motor to each transmission CU control unit, thereby achieving precise control of rolling on the rolling line.

4. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to either claim 1 or 2.

5. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to either claim 1 or 2.

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