A loom speed control system

Abstract

The present invention discloses a loom speed control system, which includes a motor and a controller, and further includes a speed detection unit. The speed detection unit includes a speed sensor disposed on the output shaft of the motor. The detection signal of the speed sensor is processed by a follower amplifier circuit, a notch adjustment circuit and an amplitude stabilization circuit in sequence and then sent into the controller. The follower amplifier circuit uses the principle of voltage follower to isolate and output the speed detection signal, ensuring electrical isolation between the speed detection signal and the outside world and preventing electrical interference. The notch adjustment circuit processes the output signal of the operational amplifier AR1 using an RLC notch filter to effectively suppress harmful signals such as mechanical noise and spike interference, and then uses a band-stop filter to further suppress power frequency noise interference. The amplitude stabilization circuit performs amplitude stabilization adjustment on the fluctuations generated by the notch adjustment circuit. The controller issues corresponding control instructions according to the detected speed value to keep the motor always at the system set value, greatly improving the control accuracy of loom speed regulation.

Description

Technical Field

[0001] The present invention relates to the technical field of motor speed regulation, and particularly to a loom speed regulation control system. Background Art

[0002] As one of the most important equipment in the textile industry, the loom provides raw materials for subsequent dyeing, sewing, etc. With the continuous development of the textile industry, the loom is also constantly updated and improved. The existing loom control system has tended to be intelligent, and the rotational speed of the loom motor is monitored in real time, and is adjusted in real time through an electrical control system to ensure the normal operation of the loom. However, in the actual use process, external interference will interfere with the detection result of the motor speed. For example, power frequency noise, mechanical noise, etc. will all affect the deviation between the detected value and the actual value of the motor speed, resulting in errors in the loom speed regulation and affecting the accuracy of the loom control.

[0003] Therefore, the present invention provides a new solution to solve this problem. Summary of the Invention

[0004] In view of the above situation, in order to overcome the deficiencies of the prior art, the purpose of the present invention is to provide a loom speed regulation control system.

[0005] The technical solution it adopts is: a loom speed regulation control system, including a motor and a controller, and further including a rotational speed detection unit. The rotational speed detection unit includes a rotational speed sensor arranged on the output shaft of the motor. The detection signal of the rotational speed sensor is sequentially processed by a follower amplifier circuit, a notch adjustment circuit, and a amplitude stabilization circuit and then sent into the controller. The controller adjusts the speed of the motor by issuing a control instruction.

[0006] Preferably, the follower amplifier circuit includes an operational amplifier AR1. The non-inverting input terminal of the operational amplifier AR1 is connected to the signal output terminal of the rotational speed sensor and grounded through a resistor R1. The inverting input terminal and the output terminal of the operational amplifier AR1 are connected to the input terminal of the notch adjustment circuit.

[0007] Preferably, the notch adjustment circuit includes operational amplifiers AR2 and AR3. The non-inverting input terminal of the operational amplifier AR2 is connected to one end of a capacitor C1, a capacitor C2, a resistor R2, and the output terminal of the operational amplifier AR3 through a resistor R4. The other end of the capacitor C1 is connected to the other end of the resistor R2, one end of a resistor R3, and the output terminal of the operational amplifier AR1 through an inductor L1. The inverting input terminal of the operational amplifier AR2 is connected to the other end of the capacitor C2 and the inverting input terminal of the operational amplifier AR3, and is connected to the output terminal of the operational amplifier AR2 and the pin 1 of a variable resistor RP1 through a resistor R5. The pin 3 of the variable resistor RP1 is connected to the non-inverting input terminal of the operational amplifier AR3. The pin 2 of the variable resistor RP1 is connected to the other end of the resistor R3.

[0008] Preferably, the amplitude stabilization circuit includes a triode VT1. The collector of the triode VT1 is connected to the output terminal of the operational amplifier AR2, the cathode of the voltage stabilizing diode DZ1, and one end of the resistor R7. The base of the triode VT1 is connected to the other end of the resistor R7 and the drain of the MOS transistor Q1. The gate of the MOS transistor Q1 is connected to the anode of the voltage stabilizing diode DZ1 and grounded through the resistor R6. The source of the MOS transistor Q1 is grounded. The emitter of the triode VT1 is connected to one end of the capacitor C3 and the controller through the resistor R8, and the other end of the capacitor C3 is grounded.

[0009] Preferably, the controller selects a DSP microprocessor.

[0010] Through the above technical solutions, the beneficial effects of the present invention are as follows:

[0011] 1. The present invention uses a rotational speed sensor to detect the rotational speed of the loom motor in real time. The follower amplification circuit uses the principle of a voltage follower to isolate and output the rotational speed detection signal, ensuring electrical isolation between the rotational speed detection signal and the outside world and preventing electrical interference.

[0012] 2. The notch adjustment circuit processes the output signal of the operational amplifier AR1 using an RLC notch filter to effectively suppress harmful signals such as mechanical noise and spike interference, and then uses a band-stop filter to further suppress power frequency noise interference, greatly improving the anti-interference ability of the rotational speed detection unit and ensuring the accuracy of the rotational speed detection result.

[0013] 3. An amplitude stabilization circuit is used to stabilize the fluctuations generated during the operation of the notch adjustment circuit. The controller issues corresponding control commands according to the rotational speed detection value to keep the motor always at the system set value, greatly improving the control accuracy of the loom speed regulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a signal processing circuit diagram of the loom speed regulation control system of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] Regarding the foregoing and other technical contents, features, and effects of the present invention, they will be clearly presented in the following detailed description in conjunction with the attached Figure 1 The structural contents mentioned in the following embodiments are all referenced to the drawings of the specification.

[0016] The exemplary embodiments of the present invention will be described below with reference to the drawings.

[0017] A loom speed control system includes a motor and a controller, and further includes a speed detection unit. The speed detection unit includes a speed sensor disposed on the output shaft of the motor. The detection signal of the speed sensor is sequentially processed by a follower amplifier circuit, a notch adjustment circuit, and a amplitude stabilization circuit and then sent into the controller. The controller adjusts the speed of the motor by issuing a control instruction.

[0018] As Figure 1 shown, the follower amplifier circuit includes an operational amplifier AR1. The non-inverting input terminal of the operational amplifier AR1 is connected to the signal output terminal of the speed sensor and grounded through a resistor R1. The inverting input terminal and the output terminal of the operational amplifier AR1 are connected to the input terminal of the notch adjustment circuit.

[0019] The notch adjustment circuit includes operational amplifiers AR2 and AR3. The non-inverting input terminal of the operational amplifier AR2 is connected to one end of a capacitor C1, a capacitor C2, a resistor R2, and the output terminal of the operational amplifier AR3 through a resistor R4. The other end of the capacitor C1 is connected to the other end of the resistor R2, one end of a resistor R3, and the output terminal of the operational amplifier AR1 through an inductor L1. The inverting input terminal of the operational amplifier AR2 is connected to the other end of the capacitor C2 and the inverting input terminal of the operational amplifier AR3, and is connected to the output terminal of the operational amplifier AR2 and the pin 1 of a variable resistor RP1 through a resistor R5. The pin 3 of the variable resistor RP1 is connected to the non-inverting input terminal of the operational amplifier AR3. The pin 2 of the variable resistor RP1 is connected to the other end of the resistor R3.

[0020] The amplitude stabilization circuit includes a triode VT1. The collector of the triode VT1 is connected to the output terminal of the operational amplifier AR2, the cathode of a voltage stabilizing diode DZ1, and one end of a resistor R7. The base of the triode VT1 is connected to the other end of the resistor R7 and the drain of a MOS transistor Q1. The gate of the MOS transistor Q1 is connected to the anode of the voltage stabilizing diode DZ1 and grounded through a resistor R6. The source of the MOS transistor Q1 is grounded. The emitter of the triode VT1 is connected to one end of a capacitor C3 and the controller through a resistor R8. The other end of the capacitor C3 is grounded.

[0021] The specific working process and principle of the present invention are as follows: The speed sensor detects the speed of the loom motor in real time, and its detection signal is output in the form of an analog electrical signal. In order to ensure the accuracy of speed detection, a speed detection unit is designed to adjust the speed detection signal. Among them, the follower amplifier circuit uses the voltage follower principle to isolate and output the speed detection signal, ensuring electrical isolation between the speed detection signal and the outside world and preventing electrical interference.

[0022] Further, the inductor L1, capacitor C1, and resistor R2 in the notch adjustment circuit form an RLC notch filter to process the output signal of the operational amplifier AR1, effectively suppressing harmful signals such as mechanical noise and spike interference. Then, the operational amplifiers AR2 and AR3 form a band-stop filter to further suppress power frequency noise interference, greatly improving the anti-interference ability of the rotation speed detection unit and ensuring the accuracy of the rotation speed detection result.

[0023] Since the notch adjustment circuit is prone to fluctuations during operation, a amplitude stabilization circuit is used to adjust the output signal of the operational amplifier AR2. Among them, the zener diode DZ1 stabilizes the output signal of the operational amplifier AR1 and serves as the conduction voltage of the MOS transistor Q1, ensuring the stability of the operation of the MOS transistor Q1. Subsequently, it plays a reference role in the base voltage of the triode VT1, thereby ensuring the stability of the amplitude of the signal output from the emitter of the triode VT1. Finally, after RC filtering and low-pass noise reduction, it is sent into the controller. The controller of the present invention selects a DSP microprocessor. The DSP microprocessor issues corresponding control instructions according to the rotation speed detection value. For example, when the motor rotation speed exceeds the set value, the DSP microprocessor issues a control instruction to reduce the motor rotation speed, so that the motor always stays at the system set value, greatly improving the control accuracy of the loom speed regulation.

[0024] The above is a further detailed description of the present invention in combination with specific embodiments, and it cannot be determined that the specific implementation of the present invention is only limited to this; for those skilled in the art of the present invention and related technical fields, on the premise of the technical solution idea of the present invention, the expansions, operation methods, and data replacements should all fall within the protection scope of the present invention.

[0025] The above is a further detailed description of the present invention in combination with specific embodiments, and it cannot be determined that the specific implementation of the present invention is only limited to this; for those skilled in the art of the present invention and related technical fields, on the premise of the technical solution idea of the present invention, the expansions, operation methods, and data replacements should all fall within the protection scope of the present invention.

Claims

1. A loom speed control system, comprising a motor and a controller, characterized in that: It further includes a rotational speed detection unit, and the rotational speed detection unit includes a rotational speed sensor arranged on the output shaft of the motor. The detection signal of the rotational speed sensor is sequentially processed by a follower amplifier circuit, a notch adjustment circuit, and an amplitude stabilization circuit and then sent into the controller. The controller adjusts the speed of the motor by issuing a control instruction. The follower amplifier circuit includes an operational amplifier AR1. The non-inverting input terminal of the operational amplifier AR1 is connected to the signal output terminal of the rotational speed sensor and grounded through a resistor R1. The inverting input terminal and the output terminal of the operational amplifier AR1 are connected to the input terminal of the notch adjustment circuit. The notch adjustment circuit includes operational amplifiers AR2 and AR3. The non-inverting input terminal of the operational amplifier AR2 is connected to one end of a capacitor C1, a capacitor C2, a resistor R2, and the output terminal of the operational amplifier AR3 through a resistor R4. The other end of the capacitor C1 is connected to the other end of the resistor R2, one end of a resistor R3, and the output terminal of the operational amplifier AR1 through an inductor L1. The inverting input terminal of the operational amplifier AR2 is connected to the other end of the capacitor C2 and the inverting input terminal of the operational amplifier AR3, and is connected to the output terminal of the operational amplifier AR2 and the pin 1 of a variable resistor RP1 through a resistor R5. The pin 3 of the variable resistor RP1 is connected to the non-inverting input terminal of the operational amplifier AR3. The pin 2 of the variable resistor RP1 is connected to the other end of the resistor R3. The rotational speed sensor performs real-time detection on the rotational speed of the loom motor, and its detection signal is output in the form of an analog electrical signal. In the notch adjustment circuit, the inductor L1, the capacitor C1, and the resistor R2 form an RLC notch filter to process the output signal of the operational amplifier AR1, and then the operational amplifiers AR2 and AR3 form a band-stop filter to further suppress the power frequency noise interference. When the rotational speed of the motor exceeds the set value, the controller issues a control instruction to reduce the rotational speed of the motor, so that the motor always operates at the system set value.

2. The loom speed control system according to claim 1, wherein: The amplitude stabilization circuit includes a triode VT1. The collector of the triode VT1 is connected to the output terminal of the operational amplifier AR2, the cathode of a voltage stabilizing diode DZ1, and one end of a resistor R7. The base of the triode VT1 is connected to the other end of the resistor R7 and the drain of a MOS transistor Q1. The gate of the MOS transistor Q1 is connected to the anode of the voltage stabilizing diode DZ1 and grounded through a resistor R6. The source of the MOS transistor Q1 is grounded. The emitter of the triode VT1 is connected to one end of a capacitor C3 and the controller through a resistor R8. The other end of the capacitor C3 is grounded.

3. The loom speed control system according to any one of claims 1-2, characterized in that: The controller selects a DSP microprocessor.

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