Yarn guide wheel with positive let-off function

Abstract

The utility model discloses a positive let-off yarn guide wheel, which belongs to the technical field of textile and comprises a transmission motor, a transmission shaft and a ceramic yarn guide wheel. Wherein the transmission motor is used for being responsible for transmitting the ceramic guide wheel of each working line; the transmission shaft is used for connecting the motor and the ceramic yarn guide wheel; the device further comprises a motor control module, a tension sensor, a rotating speed sensor, a controller module, an input module, a display module, a clock module, a storage module and a power module. The output end of the tension sensor and the output end of the rotating speed sensor are connected with the input end of the controller module, the input module, the display module, the clock module, the storage module and the power module are connected with the controller module, and the output end of the controller module is connected with the input end of the motor control module. And the problem that the tension is not smooth when the thick yarn is laid on the warp knitting machine is effectively solved.

Description

Technical Field

[0001] The utility model belongs to the field of mechanical warp feeding devices supporting warp knitting machines, in particular to a yarn guide wheel for actively feeding the warp. Background Art

[0002] In the past, when warp knitting machines were weaving thick strands of yarn, due to the large diameter and stiffness of the yarn itself, they would encounter greater resistance in the yarn path. As a result, during the weaving process of the thick strands of yarn, defects such as missed stitches, hair balls, elastic yarns and poor formation would easily appear on the fabric surface. There is currently no good solution to this problem.

[0003] Before this function of the utility model was available, due to the yarn path and tension, the tension of the thick yarn was difficult to loosen, and the formation on the cloth surface was poor, making the product less than perfect.

[0004] Based on the conventional warp knitting machine creel, this project researches and develops the yarn path of coarse-stranded yarn, creatively realizing the active warp feeding of coarse-stranded yarn on demand on the warp knitting machine, which greatly enriches the diversity of coarse-stranded yarn warp knitting products and makes it possible to smoothly weave coarse-stranded yarns that were difficult to weave on warp knitting machines in the past, greatly improving the applicability of coarse-stranded yarns on warp knitting machines. Utility Model Content

[0005] The utility model aims to overcome the problem that the tension of thick strands of yarn is tight and not smooth when the yarn is laid on a warp knitting machine, and proposes a yarn guide wheel with active warp feeding.

[0006] The present invention adopts the following technical solutions to solve the above technical problems:

[0007] A yarn guide wheel for active warp let-off comprises a transmission motor, a transmission shaft and a ceramic yarn guide wheel; wherein the transmission motor is responsible for driving the ceramic yarn guide wheel of each working line; the transmission shaft is used to connect the motor and the ceramic yarn guide wheel; it also comprises a motor control module, a tension sensor, a speed sensor, a controller module, an input module, a display module, a clock module, a storage module and a power supply module; the output ends of the tension sensor and the speed sensor are respectively connected to the input end of the controller module, the input module, the display module, the clock module, the storage module and the power supply module are respectively connected to the controller module, and the output end of the controller module is connected to the input end of the motor control module.

[0008] As a further preferred solution of a yarn guide wheel with active warp feeding of the utility model, the motor control module includes a motor controller and a motor drive circuit; the motor controller includes a motor control circuit and a motor protection circuit; the output end of the motor control circuit is connected to the input end of the motor drive circuit, the output end of the motor drive circuit is connected to the input end of the motor protection circuit, and the output end of the motor protection circuit is connected to the input end of the motor control circuit.

[0009] As a further preferred embodiment of the present invention, a yarn guide wheel with active warp feeding, the motor drive circuit includes a motor drive U4, a capacitor C6, a capacitor C7, a capacitor C8, a diode D2, a diode D3, a DC motor M1, and a DC motor M2; wherein, pin 1, pin 15, and pin 8 of the motor drive U4 are grounded, one end of the capacitor C6 is respectively connected to pin 9, pin 4, and the VCC end of the motor drive U4, the other end of the capacitor C6 is grounded, one end of the DC motor M1 is respectively connected to one end of the capacitor C8, pin 2 of the motor drive U4, and the positive electrode of the diode D2, the other end of the DC motor M1 is respectively connected to the other end of the capacitor C8 and pin 3 of the motor drive U4, the pin 13 of the motor drive U4 is respectively connected to the positive electrode of the diode D3, one end of the capacitor C7, and one end of the DC motor M2, the pin 14 of the motor drive U4 is respectively connected to the other end of the capacitor C7 and the other end of the DC motor M2, the cathode of the diode D2 is grounded, and the cathode of the diode D3 is grounded.

[0010] As a further preferred embodiment of the present invention, the motor protection circuit includes a current transformer, a controller PWM, a magnetic isolation transformer Q, an operational amplifier U, a magnetic transformer L, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a diode D1, a diode D2, a diode D3, and a capacitor C; wherein the L1 end of the magnetic transformer L is connected to the positive electrode of the diode D1, the negative electrode of the diode D1 is respectively connected to one end of the resistor R1 and the controller PWM, the other end of the resistor R1 is connected to the T1' end of the magnetic transformer L, the T2 end of the magnetic transformer L is connected to the positive electrode of the diode D2, and the negative electrode of the diode D2 is respectively connected to one end of the resistor R2 and the negative electrode of the diode D3. One end of resistor R3 is connected, the other end of resistor R3 is respectively connected to the inverting input terminal of budget amplifier U and one end of resistor R6, the other end of resistor R6 is connected to one end of capacitor C, the other end of capacitor C is respectively connected to the output terminal of operational amplifier U and the cathode of diode D3, the anode of diode D3 is respectively connected to one end of resistor R7 and T5 terminal of magnetic isolation transformer Q, the other end of resistor R7 is respectively connected to one end of resistor R4 and Vcc terminal, the other end of resistor R4 is respectively connected to one end of resistor R5 and the non-inverting input terminal of operational amplifier U, the other end of resistor R5 is connected to the other end of resistor R2 and grounded, the other end of resistor R2 is connected to T2' terminal of magnetic transformer L, and the current transformer is coupled with magnetic transformer L.

[0011] As a further preferred solution of the yarn guide wheel with active warp let-off of the present invention, the storage module includes a 256Mb Flash module and a 4Gb DDR3 module, and the Flash module and the DDR3 module are respectively connected to the control module.

[0012] As a further preferred solution of the active let-off yarn guide wheel of the present invention, it further comprises a data preprocessing module, and the tension sensor and the rotation speed sensor are connected to the controller module respectively through the data preprocessing module.

[0013] As a further preferred embodiment of the present invention, the data preprocessing module includes an amplifier circuit and a dual-op-amp bandpass filter, the amplifier circuit is composed of an OPA277 operational amplifier and a resistor and capacitor, and the dual-op-amp bandpass filter is composed of two OPA277 operational amplifiers; the data processing module specifically includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first operational amplifier, a second operational amplifier, and a third operational amplifier, wherein the signal input -IN terminal is connected to one end of the first resistor, the other end of the first resistor is respectively connected to one end of the first capacitor, one end of the third resistor and the negative power supply pin of the first operational amplifier, and the other end of the first capacitor is respectively connected to the other end of the third resistor, the negative power supply pin of the first operational amplifier. The output pin, the signal input +IN end is connected to one end of the second resistor, the other end of the second resistor is respectively connected to the positive power supply pin of the first operational amplifier, one end of the fourth resistor, and one end of the second capacitor, the other end of the second capacitor is connected to the other end of the fourth resistor and grounded, the output pin of the first operational amplifier is connected to one end of the fifth resistor, the other end of the fifth resistor is connected to the positive power supply pin of the second operational amplifier, the negative power supply pin of the second operational amplifier is connected to the negative power supply pin of the third operational amplifier, the positive power supply pin of the third operational amplifier is respectively connected to one end of the eighth resistor and one end of the ninth resistor, the other end of the ninth resistor is grounded, the other end of the eighth resistor is respectively connected to one end of the seventh resistor and the output pin of the second operational amplifier, the other end of the seventh resistor is connected to one end of the fourth capacitor, the other end of the fourth capacitor is respectively connected to one end of the ninth resistor, the other end of the ninth resistor is connected to one end of the third capacitor, and the other end of the third capacitor is grounded.

[0014] Compared with the prior art, the above technical solution adopted by the present invention has the following technical effects:

[0015] 1. This utility model is a yarn guide wheel with active warp feeding. On the basis of conventional creel, it effectively solves the problem of tight tension of thick strand yarn and uneven yarn path on warp knitting machines. The development of an active yarn guide ceramic wheel for warp knitting machines has completely reversed the problem that warp knitting machines are difficult to weave thick strand yarns, greatly broadening the application range of warp knitting machine products.

[0016] 2. The motor control module of the utility model can control the soft start of the motor, perform variable voltage and frequency speed regulation, and detect overcurrent, short circuit, phase loss, overheating and other conditions, and cut off the power supply when necessary to provide protection; the motor control system can control the soft start of the motor, and perform variable voltage and frequency speed regulation through the voltage-frequency conversion circuit and pulse width modulation (PWM) circuit; the motor protection system can detect overcurrent, short circuit, phase loss, overheating and other conditions, and cut off the power supply when necessary to provide protection;

[0017] 3. After obtaining the let-off data of each row, the utility model uses the speed sensor of the main motor of the warp knitting machine to enable the active yarn guide wheel to automatically adapt to the yarn feed amount required by the pattern and achieve different speeds, so that the yarn feed amount of each row is within a reasonable range, which is very suitable for the yarn usage during knitting;

[0018] 4. In the present invention, there is a yarn tension sensor behind each guide wheel. The yarn tension sensor can sense whether the yarn is still being fed normally. If there is an abnormality, such as sensing no tension or excessive tension, which exceeds the set range value, the yarn tension sensor can be used to feed back to the feeding system to automatically stop the machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0020] Figure 1 This is a structural principle diagram of a yarn guide wheel with active warp let-off in the utility model;

[0021] Figure 2 This is the principle diagram of the control system of the utility model;

[0022] Figure 3 This is a structural schematic diagram of the motor control module of the utility model;

[0023] Figure 4 This is a circuit diagram of the motor drive circuit of the utility model;

[0024] Figure 5 This is a circuit diagram of the motor protection circuit of the utility model;

[0025] Figure 6 It is a circuit diagram of the data preprocessing module of the utility model.

[0026] The specific numbers in the figure are as follows: 1- transmission motor; 2- transmission shaft; 3- ceramic yarn guide wheel. DETAILED DESCRIPTION

[0027] The technical solution of the present invention is further described in detail below with reference to the accompanying drawings:

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] A guide wheel for actively letting off the warp, such as Figure 1 As shown, it includes a transmission motor, a transmission shaft and a ceramic yarn guide wheel; wherein the transmission motor is responsible for driving the ceramic yarn guide wheel of each working line; the transmission shaft is used to connect the motor and the ceramic yarn guide wheel; Figure 2 As shown, it also includes a motor control module, a tension sensor, a speed sensor, a controller module, an input module, a display module, a clock module, a storage module, and a power module; the output ends of the tension sensor and the speed sensor are respectively connected to the input end of the controller module, the input module, the display module, the clock module, the storage module, and the power module are respectively connected to the controller module, and the output end of the controller module is connected to the input end of the motor control module.

[0030] like Figure 3 As shown, the motor control module includes a motor controller and a motor drive circuit; the motor controller includes a motor control circuit and a motor protection circuit; the output end of the motor control circuit is connected to the input end of the motor drive circuit, the output end of the motor drive circuit is connected to the input end of the motor protection circuit, and the output end of the motor protection circuit is connected to the input end of the motor control circuit.

[0031] The motor control circuit includes a soft start circuit, a voltage-frequency conversion circuit, a pulse width modulation circuit, and a three-phase commutation circuit. The output end of the soft start circuit is connected to the input ends of the voltage-frequency conversion circuit and the pulse width modulation circuit respectively, and the output end of the voltage-frequency conversion circuit is connected to the three-phase commutation circuit.

[0032] The soft-start circuit outputs a smoothly varying starting control voltage from 0V. The voltage-to-frequency conversion circuit converts the starting control voltage into a square wave signal with a frequency proportional to the starting control voltage, controlling the motor speed. The pulse-width modulation circuit converts the starting control voltage into a PWM wave with a duty cycle proportional to the starting control voltage, regulating the equivalent voltage applied to the motor. This achieves variable-voltage and variable-frequency speed regulation, ensuring smooth acceleration and transitions.

[0033] Pulse Width Modulation Circuit: Since the motor driver chip IR2104 is a TTL-compatible digital chip, the analog start-up control voltage is converted into a PWM wave with an adjustable duty cycle, enabling digital control of the analog signal. This also allows the MOSFET to operate in a switching state, improving efficiency and reducing heat loss. The triangle wave generator circuit, comprised of an integrated operational amplifier, generates a triangle wave with a frequency of 1kHz and an output range of 0-5V. This wave is input to the negative input of the operational amplifier. The positive input receives the start-up control voltage, which is compared by the operational amplifier, resulting in a PWM wave with a duty cycle proportional to the start-up control voltage. The effective value of the voltage applied to the motor is equal to the product of the actual voltage and the PWM wave's duty cycle, thus achieving variable-voltage and variable-frequency starting and constant-flux speed regulation.

[0034] Three-phase commutation circuit: Commutation in a three-phase asynchronous motor causes the three-phase current to change periodically, generating a rotating magnetic field that forces the motor rotor to rotate. This system uses a three-on-three conduction method, with three MOSFETs conducting at each instant. Commutation occurs every 60°, with one MOSFET commutating each time. The resulting torque rotates through 60°, and each MOSFET is energized for 180°.

[0035] It can control the soft start of the motor, perform voltage and frequency conversion speed regulation, and detect overcurrent, short circuit, phase loss, overheating and other conditions, and cut off the power supply when necessary to provide protection; the motor control system can control the soft start of the motor, and perform voltage and frequency conversion speed regulation through the voltage-frequency conversion circuit and pulse width modulation (PWM) circuit; the motor protection system can detect overcurrent, short circuit, phase loss, overheating and other conditions, and cut off the power supply when necessary to provide protection.

[0036] like Figure 4 As shown, the motor drive circuit includes a motor drive U4, a capacitor C6, a capacitor C7, a capacitor C8, a diode D2, a diode D3, a DC motor M1, and a DC motor M2; wherein, pin 1, pin 15, and pin 8 of the motor drive U4 are grounded, one end of the capacitor C6 is respectively connected to pin 9, pin 4, and the VCC end of the motor drive U4, the other end of the capacitor C6 is grounded, one end of the DC motor M1 is respectively connected to one end of the capacitor C8, pin 2 of the motor drive U4, and the positive electrode of the diode D2, the other end of the DC motor M1 is respectively connected to the other end of the capacitor C8 and pin 3 of the motor drive U4, the pin 13 of the motor drive U4 is respectively connected to the positive electrode of the diode D3, one end of the capacitor C7, and one end of the DC motor M2, the pin 14 of the motor drive U4 is respectively connected to the other end of the capacitor C7 and the other end of the DC motor M2, the cathode of the diode D2 is grounded, and the cathode of the diode D3 is grounded.

[0037] like Figure 5As shown, the motor protection circuit includes a current transformer, a controller PWM, a magnetic isolation transformer Q, an operational amplifier U, a magnetic transformer L, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a diode D1, a diode D2, a diode D3, and a capacitor C; wherein, the L1 end of the magnetic transformer L is connected to the positive electrode of the diode D1, the negative electrode of the diode D1 is respectively connected to one end of the resistor R1 and the controller PWM, the other end of the resistor R1 is connected to the T1' end of the magnetic transformer L, the T2 end of the magnetic transformer L is connected to the positive electrode of the diode D2, the negative electrode of the diode D2 is respectively connected to one end of the resistor R2 and one end of the resistor R3, and the resistor R The other end of 3 is respectively connected to the inverting input terminal of the budget amplifier U and one end of the resistor R6. The other end of the resistor R6 is connected to one end of the capacitor C. The other end of the capacitor C is respectively connected to the output terminal of the operational amplifier U and the cathode of the diode D3. The anode of the diode D3 is respectively connected to one end of the resistor R7 and the T5 terminal of the magnetic isolation transformer Q. The other end of the resistor R7 is respectively connected to one end of the resistor R4 and the Vcc terminal. The other end of the resistor R4 is respectively connected to one end of the resistor R5 and the non-inverting input terminal of the operational amplifier U. The other end of the resistor R5 is connected to the other end of the resistor R2 and to ground. The other end of the resistor R2 is connected to the T2' terminal of the magnetic transformer L. The current transformer is coupled to the magnetic transformer L.

[0038] The current transformer samples the primary current signal, and the sampled signal is sent to the PWM controller current loop and the overcurrent protection circuit respectively; the primary bus current signal Ipk is composed of: the magnetizing current Ipk1 of the main transformer and the feedback current Ipk2 converted from the secondary to the primary.

[0039] The magnetizing current of the transformer core is shown in formula (1):

[0040]

[0041] Where: D is the input voltage V in Duty cycle under conditions; L m is the primary excitation inductance; f is the switching frequency.

[0042] The secondary inductor current ripple is shown in formula (2):

[0043]

[0044] Where: L o is the output filter inductor; N p is the primary turns of the main transformer; N s The number of turns on the secondary side of the main transformer.

[0045] The feedback current converted from the secondary to the primary is shown in formula (3):

[0046]

[0047] The peak value of the primary current signal is shown in formula (4):

[0048] I pk =I pk1 +I pk2 (4)

[0049] The two secondary windings of the transformer have 50 turns each. Let R1 = R2 = 24Ω. Then the voltage values ​​at points A and B, i.e. the output voltage signal of the transformer, are:

[0050]

[0051] In the protection circuit, the op amp's non-inverting input is connected to a reference voltage (formed by a voltage-divider resistor), its inverting input is connected to a current transformer, and its output is connected to the error amplification signal via a diode. When the load current is less than the overcurrent point, the op amp's non-inverting input voltage exceeds the inverting input voltage, causing the output voltage to rise above the reference voltage, and the diode reverses to cutoff.

[0052] The utility model adopts a protection circuit to well realize short-circuit protection, can realize accurate overcurrent protection, has a small overcurrent protection recovery area, and has a strong capacitive load capacity.

[0053] The voltage-frequency conversion circuit is used to convert the starting control voltage into a square wave signal, whose frequency is proportional to the starting control voltage, to control the motor speed; the pulse width modulation circuit is used to convert the starting control voltage into a PWM wave, whose duty cycle is proportional to the starting control voltage, to adjust the equivalent voltage loaded on the motor.

[0054] The storage module includes a 256Mb Flash module and a 4Gb DDR3 module, and the Flash module and the DDR3 module are connected to the control module respectively.

[0055] It also includes a data preprocessing module, and the tension sensor and the speed sensor are connected to the controller module respectively through the data preprocessing module.

[0056] like Figure 6As shown, the data preprocessing module includes an amplifier circuit and a dual operational amplifier bandpass filter, the amplifier circuit is composed of an OPA277 operational amplifier and a resistor and capacitor, and the dual operational amplifier bandpass filter is composed of two OPA277 operational amplifiers; the data preprocessing module specifically includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first operational amplifier, a second operational amplifier, and a third operational amplifier, wherein the signal input -IN terminal is connected to one end of the first resistor, the other end of the first resistor is respectively connected to one end of the first capacitor, one end of the third resistor and the negative power supply pin of the first operational amplifier, the other end of the first capacitor is respectively connected to the other end of the third resistor and the output pin of the first operational amplifier, and the signal input +IN terminal One end of the second resistor is connected, the other end of the second resistor is respectively connected to the positive power supply pin of the first operational amplifier, one end of the fourth resistor, and one end of the second capacitor, the other end of the second capacitor is connected to the other end of the fourth resistor and grounded, the output pin of the first operational amplifier is connected to one end of the fifth resistor, the other end of the fifth resistor is connected to the positive power supply pin of the second operational amplifier, the negative power supply pin of the second operational amplifier is connected to the negative power supply pin of the third operational amplifier, the positive power supply pin of the third operational amplifier is respectively connected to one end of the eighth resistor and one end of the ninth resistor, the other end of the ninth resistor is grounded, the other end of the eighth resistor is respectively connected to one end of the seventh resistor and the output pin of the second operational amplifier, the other end of the seventh resistor is connected to one end of the fourth capacitor, the other end of the fourth capacitor is respectively connected to one end of the ninth resistor, the other end of the ninth resistor is connected to one end of the third capacitor, and the other end of the third capacitor is grounded.

[0057] The data preprocessing module amplifies and filters the sensor data before inputting it into the signal conversion circuit, significantly reducing signal noise and loss during measurement. The amplifier circuit, comprised of an OPA277 operational amplifier and resistors and capacitors, is a typical differential amplifier circuit. C3 and R6, and C4 and R7 form a low-pass filter, while two OPA277 operational amplifiers form a dual-op-amp bandpass filter. The bandpass filter's Q value and center frequency are adjustable. Adjusting R9 adjusts the circuit's resonant frequency, and adjusting R8 adjusts the circuit's Q value. It's worth noting that the array-type condensation sensor collects condensation signals from various points, selects them for output via a multiplexing analog switch, and then feeds them into the AD7794 for digital-to-analog conversion, converting the analog signal into a digital signal. This facilitates long-distance wireless signal transmission. The AD7794 analog-to-digital converter boasts a noise level of only 40nV and consumes only 400μA, making it particularly suitable for applications requiring low power consumption and high-precision measurement.

[0058] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as generally understood by those skilled in the art in the field to which the present invention belongs. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with their meanings in the context of the prior art, and will not be interpreted in an idealized or overly formal sense unless defined as such herein.

[0059] The above embodiments are only for illustrating the technical concept of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications made based on the technical solution in accordance with the technical concept of the present invention shall fall within the scope of protection of the present invention. The above embodiments of the present invention are described in detail, but the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in this field without departing from the purpose of the present invention.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A yarn guide wheel with active warp let-off, characterized in that: It includes a transmission motor, a transmission shaft and a ceramic yarn guide wheel; wherein the transmission motor is responsible for driving the ceramic yarn guide wheel of each working line; the transmission shaft is used to connect the motor and the ceramic yarn guide wheel; it also includes a motor control module, a tension sensor, a speed sensor, a controller module, an input module, a display module, a clock module, a storage module, and a power module; the output ends of the tension sensor and the speed sensor are respectively connected to the input end of the controller module, the input module, display module, clock module, storage module, and power module are respectively connected to the controller module, and the output end of the controller module is connected to the input end of the motor control module.

2. A yarn guide wheel for active warp let-off according to claim 1, characterized in that: The motor control module includes a motor controller and a motor drive circuit; the motor controller includes a motor control circuit and a motor protection circuit; the output end of the motor control circuit is connected to the input end of the motor drive circuit, the output end of the motor drive circuit is connected to the input end of the motor protection circuit, and the output end of the motor protection circuit is connected to the input end of the motor control circuit.

3. The active let-off yarn guide wheel according to claim 2, characterized in that: The motor drive circuit includes a motor drive U4, a capacitor C6, a capacitor C7, a capacitor C8, a diode D2, a diode D3, a DC motor M1, and a DC motor M2; wherein, pin 1, pin 15, and pin 8 of the motor drive U4 are grounded, one end of the capacitor C6 is respectively connected to pin 9, pin 4, and the VCC end of the motor drive U4, the other end of the capacitor C6 is grounded, one end of the DC motor M1 is respectively connected to one end of the capacitor C8, pin 2 of the motor drive U4, and the positive electrode of the diode D2, the other end of the DC motor M1 is respectively connected to the other end of the capacitor C8 and pin 3 of the motor drive U4, pin 13 of the motor drive U4 is respectively connected to the positive electrode of the diode D3, one end of the capacitor C7, and one end of the DC motor M2, pin 14 of the motor drive U4 is respectively connected to the other end of the capacitor C7 and the other end of the DC motor M2, the cathode of the diode D2 is grounded, and the cathode of the diode D3 is grounded.

4. The active warp let-off yarn guide wheel according to claim 2, characterized in that: The motor protection circuit includes a current transformer, a controller PWM, a magnetic isolation transformer Q, an operational amplifier U, a magnetic transformer L, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a diode D1, a diode D2, a diode D3, and a capacitor C; wherein, the L1 end of the magnetic transformer L is connected to the positive electrode of the diode D1, the negative electrode of the diode D1 is respectively connected to one end of the resistor R1 and the controller PWM, the other end of the resistor R1 is connected to the T1' end of the magnetic transformer L, the T2 end of the magnetic transformer L is connected to the positive electrode of the diode D2, the negative electrode of the diode D2 is respectively connected to one end of the resistor R2 and one end of the resistor R3, and the resistor R3 The other end of is respectively connected to the inverting input terminal of the budget amplifier U and one end of the resistor R6. The other end of the resistor R6 is connected to one end of the capacitor C. The other end of the capacitor C is respectively connected to the output terminal of the operational amplifier U and the negative electrode of the diode D3. The positive electrode of the diode D3 is respectively connected to one end of the resistor R7 and the T5 terminal of the magnetic isolation transformer Q. The other end of the resistor R7 is respectively connected to one end of the resistor R4 and the Vcc terminal. The other end of the resistor R4 is respectively connected to one end of the resistor R5 and the non-inverting input terminal of the operational amplifier U. The other end of the resistor R5 is connected to the other end of the resistor R2 and is grounded. The other end of the resistor R2 is connected to the T2' terminal of the magnetic transformer L. The current transformer is coupled to the magnetic transformer L.

5. The active warp let-off yarn guide wheel according to claim 1, characterized in that: The storage module includes a 256Mb Flash module and a 4Gb DDR3 module, and the Flash module and the DDR3 module are connected to the control module respectively.

6. The active warp let-off yarn guide wheel according to claim 1, characterized in that: It also includes a data preprocessing module, and the tension sensor and the speed sensor are connected to the controller module respectively through the data preprocessing module.

7. The active warp let-off yarn guide wheel according to claim 6, characterized in that: The data preprocessing module includes an amplifier circuit and a dual operational amplifier bandpass filter, the amplifier circuit is composed of an OPA277 operational amplifier and a resistor and capacitor, and the dual operational amplifier bandpass filter is composed of two OPA277 operational amplifiers; the data preprocessing module specifically includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first operational amplifier, a second operational amplifier, and a third operational amplifier, wherein the signal input -IN terminal is connected to one end of the first resistor, the other end of the first resistor is respectively connected to one end of the first capacitor, one end of the third resistor and the negative power supply pin of the first operational amplifier, the other end of the first capacitor is respectively connected to the other end of the third resistor and the output pin of the first operational amplifier, and the signal input +IN terminal is connected One end of the second resistor is connected to the positive power supply pin of the first operational amplifier, one end of the fourth resistor, and one end of the second capacitor. The other end of the second capacitor is connected to the other end of the fourth resistor and grounded. The output pin of the first operational amplifier is connected to one end of the fifth resistor, the other end of the fifth resistor is connected to the positive power supply pin of the second operational amplifier, the negative power supply pin of the second operational amplifier is connected to the negative power supply pin of the third operational amplifier, the positive power supply pin of the third operational amplifier is respectively connected to one end of the eighth resistor and one end of the ninth resistor, the other end of the ninth resistor is grounded, the other end of the eighth resistor is respectively connected to one end of the seventh resistor and the output pin of the second operational amplifier, the other end of the seventh resistor is connected to one end of the fourth capacitor, the other end of the fourth capacitor is respectively connected to one end of the ninth resistor, the other end of the ninth resistor is connected to one end of the third capacitor, and the other end of the third capacitor is grounded.

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