CN115608782A - Coiler torque control method, device and frequency converter - Google Patents

Abstract

The invention discloses a coiler torque control method, device and frequency converter. The method includes: if the coiler is in the speed control mode, obtaining the actual running speed and the actual output current of the coiler; The speed adjusts the speed setting value to determine the current setting value of the coiling machine, wherein the speed setting value is greater than the linear speed of the coiling machine; adjusts the current setting value based on the actual output current to determine the coiling machine current setting value. The actual torque value of the machine; compare the actual torque value with the torque set value, select the smaller torque value as the target torque value; output the target torque value, and control the coiler to execute according to the target torque value corresponding control mode. The method can effectively solve the technical problem that the strip quality is damaged due to large torque output fluctuations during the switching process of the speed control and torque control of the coiler, and is conducive to improving the torque output stability of the switching process.

Description

Coiler torque control method, device and frequency converter

technical field

The invention relates to the technical field of continuous casting and rolling, in particular to a coiler torque control method, device and frequency converter.

Background technique

The coiler is the last process of the continuous casting and rolling production line. The precise and stable control of the coiler directly affects the quality of the finished steel coil. In order to ensure the quality of steel coils in the production line, the coiler adopts a combination of speed control and torque control. Before the strip is built, the coiler is in the speed mode, and the coiler runs at the rolling speed + traction speed, so that the coiler can build a sheet; when the strip enters the coiler, the sheet is built, until before coiling The coiler is always in the torque control mode during the process before the pinch roller flicks and throws steel; after the pinch roller flicks and throws steel, the coiler switches to the speed control mode immediately as the strip tension disappears.

Therefore, the speed control and torque control of the coiler need to be switched frequently according to the different production steps, and the torque output stability of the switching process directly affects the quality of the strip. This application provides a coiler torque control method through research on the speed control and torque control methods of the coiler.

Contents of the invention

The embodiment of the present application provides a coiler torque control method, device, and frequency converter, which can effectively solve the problem of strip steel failure caused by large torque output fluctuations during the coiler speed control and torque control switching process. The technical problem of quality damage is conducive to improving the torque output stability during the switching process.

In the first aspect, the present invention provides the following technical solutions through an embodiment of the present invention:

A coiler torque control method, which is applied to a frequency converter, and the frequency converter is used to switch the coiler between speed control mode and torque control mode, and the method includes: if the coiler is in In the speed control mode, the actual operating speed and actual output current of the coiler are obtained; the speed setting value is adjusted based on the actual operating speed to determine the current setting value of the coiling machine, wherein the The speed setting value is greater than the linear speed of the coiler; the current setting value is adjusted based on the actual output current to determine the actual torque value of the coiler; compare the actual torque value and torque setting value, select a smaller torque value as the target torque value; output the target torque value, and control the coiler to execute a corresponding control mode according to the target torque value.

Preferably, controlling the coiler to execute a corresponding control mode according to the target torque value includes: if the actual torque value is used as the target torque value, controlling the coiler to execute The speed control mode; if the torque setting value is used as the target torque value, control the coiler to switch from the speed control mode to the torque control mode.

Preferably, after controlling the coiler to switch from the speed control mode to the torque control mode, the method further includes: comparing the actual running speed with the speed set value; if the actual running If the speed is greater than or equal to the speed setting value, the coiler is controlled to switch from the torque control mode to the speed control mode.

Preferably, adjusting the speed setting value based on the actual running speed to determine the current setting value of the coiler includes: passing the actual running speed and the speed setting value through a speed adjustment algorithm, The initial value of the current setting is obtained; the speed limit adjustment is performed on the initial value of the current setting to determine the current setting value of the coiler.

Preferably, the adjusting the speed limit to the initial value of the current setting to determine the current setting value of the coiler includes: judging whether the initial value of the current setting is within the limit of the speed limit within the range; if the initial value of the current setting is greater than the upper limit of the speed limit, then determine the upper limit of the speed limit as the current setting value; if the initial value of the current setting is less than the speed limit, then determine the lower limit of the speed limit as the current set value; if the initial value of the current setting is within the range of the speed limit, then determine the initial value of the output current set value for the current.

Preferably, adjusting the current setting value based on the actual output current to determine the actual torque value of the coiler includes: adjusting the actual output current and the current setting value through current adjustment The algorithm is used to obtain the initial value of the actual torque; the current limit adjustment is performed on the initial value of the actual torque to determine the actual torque value of the coiler.

Preferably, the adjusting the current limit of the actual torque initial value to determine the actual torque value of the coiler includes: judging whether the actual torque initial value is within the limit of the current limit within the range; if the initial value of the actual torque is greater than the upper limit of the current limit, then determine the upper limit of the current limit as the actual torque value; if the initial value of the actual torque is less than the current limit, then determine the lower limit of the current limit as the actual torque value; if the actual torque initial value is within the range of the current limit, then set the actual torque initial value determined as the actual torque value.

Preferably, the method further comprises: if it is detected that the steel strip is in a damaged state, controlling the coiler to be in the torque control mode.

In the second aspect, the present invention provides the following technical solutions through an embodiment of the present invention:

A coiler torque control device, comprising:

An acquisition module, configured to acquire the actual operating speed and actual output current of the coiler if the coiler is in the speed control mode;

A current setting value determination module, configured to adjust the speed setting value based on the actual running speed to determine the current setting value of the coiler, wherein the speed setting value is greater than the coiler line speed;

An actual torque value determination module, configured to adjust the current setting value based on the actual output current, and determine the actual torque value of the coiler;

The first comparison module is used to compare the actual torque value and the torque setting value, and select the smaller torque value as the target torque value;

A control module, configured to output the target torque value, and control the coiler to execute a corresponding control mode according to the target torque value.

In a third aspect, the present invention provides the following technical solutions through an embodiment of the present invention:

A frequency converter, comprising: a memory, a processor, and a computer program stored on the memory and operable on the processor, when the processor executes the program, the steps of any one of the methods described in the preceding first aspect are implemented .

One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

In the coiler torque control method provided by the embodiment of the present invention, if the coiler is in the speed control mode (at this time, it may be when a signal to switch the speed control mode to the torque control mode is received), by obtaining the torque control method of the coiler Adjust the actual running speed based on the speed setting value to determine the actual output current of the coiler, and then adjust the actual output current according to the current setting value to determine the actual torque value of the coiler , comparing the actual torque value with the received torque setting value, judging the smaller value between the actual torque value and the torque setting value, and taking the smaller value as the target torque value. Since the speed setting value is higher than the linear speed of the coiler, the speed setting value with a higher speed is adjusted based on the actual operating speed, so that the speed deviation of the inverter is always positive, so that the actual operating speed of the inverter increases gradually To the speed setting value, in the process, the actual torque value is first smaller than the torque setting value, at this time the actual torque value is used as the target torque value, until the actual torque value is greater than the torque setting value, indicating that the winding The winder meets the requirement that it can be converted from the speed control mode to the torque control mode. At this time, the frequency converter controls the coiler to execute the torque control mode, which solves the torque fluctuation during the switching process from the speed control mode to the torque control mode. The equipment vibration caused by excessive vibration will lead to damage to the quality of the strip, which is conducive to improving the stability of the torque output during the switching process and ensuring the quality of the strip and the stability of production.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings that need to be used in the description of the embodiments. Obviously, the drawings in the following description are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort.

Fig. 1 is the flow chart of the coiler torque control method provided by the embodiment of the present invention;

Fig. 2 is a schematic diagram of the process of coiler torque control provided by an embodiment of the present invention;

Fig. 3 is a schematic structural diagram of a coiler torque control device provided by an embodiment of the present invention;

Fig. 4 is a schematic structural diagram of a frequency converter provided by an embodiment of the present invention.

detailed description

The embodiment of the present application provides a coiler torque control method, device, and frequency converter, which can effectively solve the problem of strip steel failure caused by large torque output fluctuations during the coiler speed control and torque control switching process. The technical problem of quality damage is conducive to improving the torque output stability during the switching process.

The overall idea of the technical solution of the embodiment of the application is as follows:

A coiler torque control method, which is applied to a frequency converter, and the frequency converter is used to switch the coiler between speed control mode and torque control mode, and the method includes: if the coiler is in In the speed control mode, the actual operating speed and actual output current of the coiler are obtained; the speed setting value is adjusted based on the actual operating speed to determine the current setting value of the coiling machine, wherein the The speed setting value is greater than the linear speed of the coiler; the current setting value is adjusted based on the actual output current to determine the actual torque value of the coiler; compare the actual torque value and torque setting value, select a smaller torque value as the target torque value; output the target torque value, and control the coiler to execute a corresponding control mode according to the target torque value.

In order to better understand the above-mentioned technical solution, the above-mentioned technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

In the first aspect, a coiler torque control method provided by an embodiment of the present invention is applied to a frequency converter, and the frequency converter is used to switch the coiler between the speed control mode and the torque control mode, Specifically, as shown in FIG. 1 , the method includes the following steps S101 to S105.

Step S101, if the coiler is in the speed control mode, then obtain the actual running speed of the coiler;

Step S102, adjusting the speed setting value based on the actual running speed to determine the current setting value of the coiler, wherein the speed setting value is greater than the linear speed of the coiler;

Step S103, adjusting the current setting value based on the actual output current to determine the actual torque value of the coiler;

Step S104, comparing the actual torque value with the torque setting value, and selecting the smaller torque value as the target torque value;

Step S105, outputting the target torque value, and controlling the coiler to execute a corresponding control mode according to the target torque value.

It should be noted that the frequency converter provided in this application may include a speed regulator, a current regulator and a comparator.

In a specific embodiment, if the coiler is in the speed control mode, or when the frequency converter controls the coiler to switch from the speed control mode to the torque control mode, the frequency converter needs to perform the step of obtaining the target torque value, To control the coiler based on the target torque value.

Specifically, the frequency converter can obtain the actual running speed of the coiler in real time. The actual running speed can be detected by the speed measuring instrument in real time, compiled through the on-site speed encoder, and given by the programmable logic controller PLC connected to the frequency converter. , and then determine the current setting value of the coiler based on the speed setting value and the actual running speed.

Wherein, the speed setting value is greater than the linear speed of the coiler. Specifically, the setting range of the speed setting value can be determined according to the installation on site, the model of the equipment, and the like. For example, the speed set point could be 5% above the line speed.

In a specific embodiment, the actual operating speed is adjusted based on the speed setting value to determine the current setting value of the coiler, which may specifically include: passing the actual operating speed and the speed setting value through a speed adjustment algorithm to obtain the current setting value Set the initial value; adjust the speed limit to the initial value of the current setting to determine the current setting value of the coiler.

Specifically, as shown in FIG. 2 , the speed setting value and the actual running speed can be adjusted by PID through the speed regulator 101 in the frequency converter to obtain the initial value of the current setting. In order to prevent the output value of the speed regulator 101 (i.e. the initial value of the current setting) from exceeding the specified range, the initial value of the current setting is adjusted by the speed limiter 102 to determine the current setting value of the coiler. The value is used as the input value of the current regulator 103.

Wherein, the speed limiter 102 is adjusted to the initial value of the current setting, and the current setting value of the coiler is determined, which may specifically include: judging whether the initial value of the current setting is within the range of the speed limiter 102; If the initial value is greater than the upper limit of the speed limiter 102, then the upper limit of the speed limiter 102 is determined as the current setting value; if the initial value of the current setting is less than the lower limit of the speed limiter 102, then the lower limit of the speed limiter 102 is determined as the current set value; if the current set initial value is within the range of the speed limiter 102, then the current set initial value is determined as the current set value. Therefore, the current setting value of the coiler is controlled within the threshold range set by the speed limiter 102 .

Wherein, the speed limiter 102 can be set through the internal parameters of the frequency converter according to the technical requirements of the coiler, which is not specifically limited in this application.

Then, based on the current set value of the speed regulator 101 received by the current regulator 103 in the frequency converter, the actual torque value TRQ_REF of the coiler can be determined. In a specific embodiment, the actual output current is adjusted based on the current setting value to determine the actual torque value TRQ_REF of the coiler, which may specifically include: passing the actual output current and the current setting value through a current adjustment algorithm to obtain the actual Torque initial value; adjust the current limit 104 on the actual torque initial value to determine the actual torque value TRQ_REF of the coiler.

Specifically, adjusting the current limit 104 on the initial value of the actual torque to determine the actual torque value TRQ_REF of the coiler includes: judging whether the initial value of the actual torque is within the range of the current limit 104; if the actual torque If the initial value is greater than the upper limit of the current limiter 104, then the upper limit of the current limiter 104 is determined as the actual torque value TRQ_REF; if the actual torque initial value is less than the lower limit of the current limiter 104, then the lower limit of the current limiter 104 is determined as The actual torque value TRQ_REF; if the initial value of the actual torque is within the range of the current limiter 104, then the initial value of the actual torque is determined as the actual torque value TRQ_REF. Therefore, the actual torque value TRQ_REF of the coiler is controlled within the threshold range set by the current limiter 104 .

Wherein, the current limiter 104 can be set through the internal parameters of the frequency converter according to the technical requirements of the coiler, which is not specifically limited in this application.

It should be noted that the actual output current can be converted by the current transformer inside the frequency converter.

As shown in FIG. 2 , the current regulator 103 receives the current setting value of the speed regulator 101 and the actual output current for PID adjustment, and then determines the actual torque value TRQ_REF of the coiler through the current limiter 104 .

When the coiler is in the torque mode, the frequency converter receives the torque setting value TENS_R1 sent by the PLC, and then compares the actual torque value TRQ_REF with the torque setting value TENS_R1.

In a specific embodiment, before comparing the actual torque value TRQ_REF with the torque setting value TENS_R1 , it may also include performing torque limit adjustment on the initial torque setting value. Wherein, the torque limiter 105 can be set through the internal parameters of the frequency converter according to the technological requirements of the coiler, which is not specifically limited in this application.

Specifically, judge whether the torque setting initial value is within the range of the torque limiter 105; if the torque setting initial value is greater than the upper limit of the torque limiter 105, then the upper limit of the torque limiter 105 is determined as torque Set value TENS_R1; if the torque setting initial value is less than the lower limit of the speed limiter 102, then the lower limit of the torque limiter 105 is determined as the torque setting value TENS_R1; if the torque setting initial value is within the speed limiter 102 Within the range, the initial value of the torque setting is determined as the torque setting value TENS_R1. Therefore, the torque setting value TENS_R1 of the coiler is controlled within the threshold range set by the torque limiter 105 .

Next, the actual torque value TRQ_REF is compared with the torque setting value TENS_R1 by the comparator 106 in the frequency converter, and a smaller torque value is selected as the target torque value T_R. Specifically, if the actual torque value TRQ_REF is less than or equal to the torque setting value TENS_R1, then determine the actual torque value TRQ_REF as the target torque value T_R, if the actual torque value TRQ_REF is greater than the torque setting value TENS_R1, then determine The torque setting value TENS_R1 is used as the target torque value T_R.

In a specific embodiment, after the target torque value T_R is determined, the frequency converter outputs the target torque value T_R, and controls the coiler to execute a corresponding control mode according to the target torque value T_R. Specifically, according to the target torque value T_R, control the coiler to execute the corresponding control mode, which may specifically include: if the actual torque value TRQ_REF is used as the target torque value T_R, then control the coiler to execute the speed control mode; if the torque Set the value TENS_R1 as the target torque value T_R, then control the coiler to switch from the speed control mode to the torque control mode.

Specifically, when the actual torque value TRQ_REF is less than or equal to the torque setting value TENS_R1, the actual torque value TRQ_REF is output as the target torque value T_R, indicating that the current winding site has not yet reached the execution torque setting value TENS_R1 The requirements, that is, the requirements for switching from the speed control mode to the torque control mode have not been met. Since the speed setting value is greater than the linear speed of the coiler, the speed deviation of the inverter is still positive, so the actual output current output by the speed regulator 101 of the inverter continues to increase, so that the actual torque value TRQ_REF continues to increase until The actual torque value TRQ_REF is greater than the torque setpoint TENS_R1.

When the actual torque value TRQ_REF is greater than the torque setting value TENS_R1, the torque setting value TENS_R1 is output as the target torque value T_R, and the actual torque has reached the requirement of the torque setting value TENS_R1, indicating that the coiler has It can switch from the speed control mode to the torque control mode. At this time, when the coiler is switched from the speed control mode to the torque control mode, there is no torque fluctuation, thus solving the problem in the control mode switching process. The problem of torque fluctuation in medium.

In a specific embodiment, after controlling the coiler to switch from the speed control mode to the torque control mode, it may also include: comparing the actual running speed with the speed setting value; if the actual running speed is greater than or equal to the speed setting value, then The control coiler is switched from torque control mode to speed control mode.

Specifically, when the actual operating speed increases to 5% higher than the line speed of the coiler, the saturation state of the speed regulator 101 is canceled, so that the current setting value gradually decreases, and the actual torque value TRQ_REF decreases gradually, and then The actual torque value TRQ_REF starts to be less than or equal to the torque setting value TENS_R1, and the coiler switches to the speed control mode at this time, realizing the switch between the speed control mode and the torque control mode of the coiler.

Further, in order to effectively avoid abnormal operation of the equipment, the coiler torque control method provided in the present application may further include: if it is detected that the strip is in a damaged state, controlling the coiler to be in the torque control mode.

Specifically, after the strip steel enters the coiler, it is detected whether the strip steel is in a damaged state, and if so, the coiler is controlled to be in the torque control mode, so as to avoid the damaged strip steel being damaged twice under the speed control mode and damage to equipment. Wherein, the damaged state may refer to a state such as a broken strip, cracks appearing in the strip, and the like.

In this way, even if the steel strip breaks during the actual production process, the equipment still continues to operate with torque control, and the motor accelerates at this time.

Therefore, when the coiler is switched from the speed control mode to the torque control mode, the frequency converter converts the current setting value through the speed regulator 101 based on the received speed setting value 5% higher than the line speed and the actual running speed , the current set value and the actual output current are converted to the actual torque value TRQ_REF by the current regulator 103, and when the coiler is in the torque control mode, the torque set value TENS_R1 received by the inverter is compared with the actual torque The value TRQ_REF and the torque setting value TENS_R1 determine the smaller torque value as the target torque value T_R of the inverter, so as to achieve the stable torque value of the coiler in the process of switching from speed control mode to torque control mode , to ensure the quality of the strip.

To sum up, the torque control method of the coiler provided by the embodiment of the present invention can effectively solve the problem that the coiler’s torque output fluctuates greatly during the switching process of the coiler’s speed control and torque control. The technical problem of quality damage is conducive to improving the stability of torque output during the switching process. This method can effectively participate in the adjustment of torque control to ensure the quality of strip steel and the stability of production.

In the second aspect, based on the same inventive concept, this embodiment provides a coiler torque control device, as shown in Figure 3, including:

An acquisition module 301, configured to acquire the actual operating speed and actual output current of the coiler if the coiler is in the speed control mode;

The current setting value determination module 302 is configured to adjust the speed setting value based on the actual running speed to determine the current setting value of the coiler, wherein the speed setting value is greater than the coiling speed machine line speed;

An actual torque value determining module 303, configured to adjust the current setting value based on the actual output current, and determine the actual torque value of the coiler;

The first comparison module 304 is used to compare the actual torque value with the torque setting value, and select a smaller torque value as the target torque value;

The control module 305 is configured to output the target torque value, and control the coiler to execute a corresponding control mode according to the target torque value.

As an optional embodiment, the control module 305 is specifically configured to: if the actual torque value is used as the target torque value, control the coiler to execute the speed control mode; if the If the torque setting value is used as the target torque value, the coiler is controlled to switch from the speed control mode to the torque control mode.

As an optional embodiment, the device also includes:

The second comparison module is used to compare the actual running speed with the speed setting value; if the actual running speed is greater than or equal to the speed setting value, then control the coiler to be controlled by the torque mode switch to the speed control mode.

As an optional embodiment, the current setting value determination module 302 includes:

The speed adjustment sub-module is used to pass the actual operating speed and the speed setting value through the speed adjustment algorithm to obtain the initial value of the current setting;

The speed limit adjustment sub-module is used to perform speed limit adjustment on the initial value of the current setting to determine the current setting value of the coiler.

As an optional embodiment, the speed limit adjustment submodule is specifically used to: judge whether the initial value of the current setting is within the range of the speed limit; if the initial value of the current setting is greater than the upper limit of the speed limit, then determine the upper limit of the speed limit as the current setting value; if the initial value of the current setting is less than the lower limit of the speed limit, then set the speed limit The lower limit of is determined as the current setting value; if the current setting initial value is within the range of the speed limit, then the output current initial value is determined as the current setting value.

As an optional embodiment, the actual torque value determining module 303 includes:

The current regulation sub-module is used to pass the actual output current and the current setting value through the current regulation algorithm to obtain the actual torque initial value;

The current limit adjustment sub-module is used to perform current limit adjustment on the actual torque initial value to determine the actual torque value of the coiler.

As an optional embodiment, the current limit adjustment submodule is specifically used to: judge whether the actual torque initial value is within the range of the current limit; if the actual torque initial value is greater than the upper limit of the current limit, then determine the upper limit of the current limit as the actual torque value; if the initial value of the actual torque is less than the lower limit of the current limit, then set the current limit The lower limit of is determined as the actual torque value; if the initial value of the actual torque is within the range of the current limit, the initial value of the actual torque is determined as the actual torque value.

As an optional embodiment, the device further includes:

The steel strip abnormal detection module is used to control the coiler to be in the torque control mode if it is detected that the steel strip is in a damaged state.

The above modules may be realized by software codes, and at this time, the above modules may be stored in the memory of the control device. Each of the above modules can also be realized by hardware such as an integrated circuit chip.

The coiler torque control device provided by the embodiment of the present invention has the same realization principle and technical effect as the aforementioned method embodiment. For a brief description, the parts not mentioned in the device embodiment can refer to the aforementioned method Corresponding content in the embodiment.

In the third aspect, based on the same inventive concept, this embodiment provides a frequency converter 500, as shown in Figure 4, including: a memory 501, a processor 502, and a computer program 503 stored in the memory and operable on the processor When the processor 501 executes the program, the steps of the coiler torque control method described in the first aspect are implemented.

While preferred embodiments of the invention have been described, additional changes and modifications to these embodiments can be made by those skilled in the art once the basic inventive concept is appreciated. Therefore, it is intended that the appended claims be construed to cover the preferred embodiment as well as all changes and modifications which fall within the scope of the invention.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (10)

1. A coiler torque control method, characterized in that it is applied in a frequency converter, and the frequency converter is used to switch between the speed control mode and the torque control mode of the coiler, and the method includes : If the coiler is in the speed control mode, then obtain the actual operating speed and actual output current of the coiler; adjusting the speed setting value based on the actual running speed to determine the current setting value of the coiler, wherein the speed setting value is greater than the linear speed of the coiler; adjusting the current setting value based on the actual output current to determine the actual torque value of the coiler; comparing the actual torque value with the torque set value, and selecting a smaller torque value as the target torque value; Outputting the target torque value, and controlling the coiler to execute a corresponding control mode according to the target torque value. 2. The method according to claim 1, wherein the controlling the coiler to execute a corresponding control mode according to the target torque value comprises: If the actual torque value is used as the target torque value, then controlling the coiler to execute the speed control mode; If the torque setting value is used as the target torque value, the coiler is controlled to switch from the speed control mode to the torque control mode. 3. The method according to claim 2, wherein, after controlling the coiler to switch from the speed control mode to the torque control mode, the method further comprises: comparing said actual operating speed with said speed setpoint; If the actual running speed is greater than or equal to the speed setting value, the coiler is controlled to switch from the torque control mode to the speed control mode. 4. The method according to claim 1, wherein said adjusting the speed setting value based on the actual running speed to determine the current setting value of the coiler comprises: Pass the actual operating speed and the speed setting value through a speed adjustment algorithm to obtain an initial value of the current setting; The speed limit adjustment is performed on the initial value of the current setting to determine the current setting value of the coiler. 5. The method according to claim 4, characterized in that, performing speed limit adjustment on the initial value of the current setting to determine the current setting value of the coiler includes: judging whether the initial value of the current setting is within the range of the speed limit; If the initial value of the current setting is greater than the upper limit of the speed limiter, then determine the upper limit of the speed limiter as the current setting value; If the initial value of the current setting is less than the lower limit of the speed limiter, then determine the lower limit of the speed limiter as the current setting value; If the initial value of the current setting is within the range of the speed limit, the initial value of the output current is determined as the current setting value. 6. The method according to claim 1, wherein the adjusting the current setting value based on the actual output current to determine the actual torque value of the coiler comprises: Passing the actual output current and the current setting value through a current regulation algorithm to obtain an initial value of the actual torque; The current limit adjustment is performed on the initial value of the actual torque to determine the actual torque value of the coiler. 7. The method according to claim 6, wherein said performing current limit adjustment on the initial value of the actual torque to determine the actual torque value of the coiler comprises: judging whether the initial value of the actual torque is within the range of the current limit; If the actual torque initial value is greater than the upper limit of the current limit, then determine the upper limit of the current limit as the actual torque value; If the actual torque initial value is less than the lower limit of the current limit, then determine the lower limit of the current limit as the actual torque value; If the actual torque initial value is within the range of the current limit, the actual torque initial value is determined as the actual torque value. 8. The method of claim 1, further comprising: If it is detected that the strip is in a damaged state, the coiler is controlled to be in the torque control mode. 9. A coiler torque control device, characterized in that it comprises: An acquisition module, configured to acquire the actual operating speed and actual output current of the coiler if the coiler is in the speed control mode; The current setting value determination module is used to adjust the speed setting value based on the actual running speed to determine the current setting value of the coiler, wherein the speed setting value is greater than the coiler line speed; An actual torque value determining module, configured to adjust the current setting value based on the actual output current, and determine the actual torque value of the coiler; The first comparison module is used to compare the actual torque value and the torque setting value, and select the smaller torque value as the target torque value; A control module, configured to output the target torque value, and control the coiler to execute a corresponding control mode according to the target torque value. 10. A frequency converter, characterized in that it comprises: a memory, a processor, and a computer program stored on the memory and operable on the processor, and the processor implements any of claims 1-8 when executing the program. A step of said method.

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