Pressure and speed regulating device with rotating speed redundancy detection function

Abstract

The utility model discloses a voltage regulation and speed regulation device with a rotating speed redundancy detection function. The voltage regulation and speed regulation device comprises a trigger unit, a main control unit and a three-phase rotor frequency / voltage detection module, respectively corresponding three paths of independent rotor state signals are output through a three-phase rotor frequency / voltage detection module; the trigger unit generates and issues a silicon controlled rectifier trigger instruction to the silicon controlled rectifier driving module, generates a voltage and speed regulation instruction according to the signals corresponding to the rest of the three independent rotor state signals when any one of the three independent rotor state signals is abnormal, and issues the voltage and speed regulation instruction to the silicon controlled rectifier driving module for speed regulation; and the main control unit compares the two motor rotating speed signals to judge whether the deviation between the two motor rotating speed signals has trigger control abnormity or not, and generates and issues a trigger unit fault early warning signal when the deviation is abnormal. According to the utility model, the controllability of speed control can be ensured, and the safety of the system is obviously improved at the same time.

Description

Technical Field

[0001] This utility model relates to the field of crane control technology, and in particular to a voltage and speed regulating device with speed redundancy detection. Background Technology

[0002] Existing crane speed control devices achieve speed control by adjusting the motor stator voltage, with closed-loop speed control at their core. Traditional solutions typically use a single main control module, calculating motor speed by capturing a single frequency signal from the rotor circuit, without detecting rotor voltage. This design has a significant drawback: when the motor approaches synchronous speed, the rotor frequency approaches zero. At this point, the frequency signal alone cannot accurately determine whether the speed is normal. If the sole frequency detection circuit fails due to a broken wire, component malfunction, or microcontroller unit anomaly, the entire speed closed loop will go out of control, potentially leading to serious safety accidents such as crane load slippage or collisions. Utility Model Content

[0003] This invention provides a voltage regulation and speed control device with redundant speed detection to overcome the technical problem of low reliability of single-point detection.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows:

[0005] A voltage and speed regulating device with redundant speed detection includes: a triggering unit, a main control unit, a three-phase rotor frequency / voltage detection module, a communication unit, and a thyristor drive module;

[0006] The three-phase rotor frequency / voltage detection module is connected to the trigger unit and the main control unit respectively. It is used to independently collect the three-phase induced signals in the rotor circuit of the drive motor, and output three independent rotor status signals corresponding to each to the trigger unit, and send one of the independent rotor status signals to the main control unit.

[0007] The main control unit is connected to the triggering unit via a communication unit and is used to send speed commands to the triggering unit;

[0008] The triggering unit is used to: collect power grid status signals and motor stator operating status signals, and receive the speed command, and based on the speed command, power grid status signals and motor stator operating status signals, generate and send a thyristor triggering command to the thyristor drive module;

[0009] The triggering unit is also used to generate voltage and speed regulation commands based on the corresponding signals of the remaining three independent rotor status signals when any one of the three signals is abnormal, and send them to the thyristor drive module to adjust the motor stator voltage and thus achieve speed regulation.

[0010] Furthermore, the triggering unit outputs the generated motor speed signal to the main control unit for speed redundancy detection. The motor speed signal is generated based on three independent rotor status signals received.

[0011] The main control unit is used to compare the motor speed signal generated based on an independent rotor status signal with the motor speed signal corresponding to the same line received from the trigger unit to determine whether the deviation between the two motor speed signals indicates a trigger control abnormality, and to generate and send a trigger unit fault warning signal when an abnormality occurs.

[0012] Furthermore, the triggering unit includes a triggering module, a three-phase power frequency / voltage detection module, a three-phase stator voltage detection module, and a three-phase stator current detection module connected to the triggering module;

[0013] The three-phase power frequency / voltage detection module is used to collect the grid frequency, voltage zero-crossing point and voltage RMS value, and transmit them to the trigger module.

[0014] The three-phase stator voltage detection module is used to collect the effective value of the stator voltage and transmit it to the trigger module;

[0015] The three-phase stator current detection module is used to collect the effective value of the stator current and transmit it to the trigger module.

[0016] Furthermore, the main control unit includes a main control module, a speed command input module connected to the main control module, and a relay control module;

[0017] The speed command input module is used to collect speed commands and transmit them to the main control module;

[0018] The relay control module is used to control the actuator to start the protection program based on the fault warning signal of the trigger unit.

[0019] Furthermore, the three-phase rotor frequency / voltage detection module includes a first-phase rotor frequency / voltage detection unit, a second-phase rotor frequency / voltage detection unit, and a third-phase rotor frequency / voltage detection unit;

[0020] Each of the first-phase rotor frequency / voltage detection unit, the second-phase rotor frequency / voltage detection unit, and the third-phase rotor frequency / voltage detection unit includes a signal input terminal, an input isolation and step-down circuit, and two parallel signal processing circuits.

[0021] The signal input terminal includes a first rotor signal input terminal and a second rotor signal input terminal;

[0022] The input isolation and step-down circuit is connected between the signal input terminal and the two parallel signal processing circuits, and is used to isolate and step down the input rotor induction signal.

[0023] Each of the aforementioned signal processing circuits is used to convert the rotor induction signal into an analog voltage signal and a digital frequency signal that can be recognized by both the trigger module and the main control module.

[0024] Furthermore, the input isolation and step-down circuit includes an AC loop, a signal sampling and isolation circuit, and a DC voltage divider circuit;

[0025] The AC circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor, and a fifth resistor;

[0026] Wherein, the first end of the first resistor is connected to the first rotor signal input end, the second end of the first resistor is connected to the first end of the second resistor, the second end of the second resistor is connected to the first end of the third resistor, the second end of the third resistor is connected to the first end of the fourth resistor, and the second end of the fourth resistor is connected to the first end of the fifth resistor.

[0027] The signal sampling and isolation unit includes a seventh resistor, an isolation amplifier, and an isolation power supply module;

[0028] The first end of the seventh resistor is connected to the first output pin of the isolation amplifier, and the second end is connected to the second output pin of the isolation amplifier; the seventh output pin and the fourth output pin of the isolation power supply module are respectively connected to the first output pin and the fourth output pin of the isolation amplifier.

[0029] Furthermore, the second end of the fifth resistor is connected to the first end of the seventh resistor;

[0030] The fourth and fifth output pins of the isolation power supply module are connected to the second rotor signal input terminal;

[0031] The DC voltage divider circuit includes a sixth resistor and a ninth resistor. The first end of the sixth resistor is connected to the first end of the seventh resistor, the second end of the sixth resistor is connected to the first end of the ninth resistor, and the second end of the ninth resistor is connected to the second end of the seventh resistor.

[0032] The signal processing circuit also includes a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, an eighth resistor, a first diode, and a second diode;

[0033] The first terminal of the first capacitor is connected to the first power supply, and the second terminal of the first capacitor is grounded.

[0034] The first terminal of the second capacitor is connected to the second power supply, the second terminal of the second capacitor is grounded, and the first terminal of the second capacitor is connected to the second output pin of the isolation power supply module.

[0035] The two ends of the third capacitor are respectively connected to the first output pin 1 and the fourth output pin of the isolation amplifier;

[0036] The two ends of the fourth capacitor are respectively connected to the two ends of the eighth resistor;

[0037] The first terminal of the fifth capacitor is connected to the second terminal of the seventh resistor, and the second terminal of the fifth capacitor is connected to the second rotor signal input terminal.

[0038] The first end of the eighth resistor is connected to the first end of the sixth resistor, and the second end of the eighth resistor is connected to the second rotor signal input terminal.

[0039] After the first diode and the second diode are connected in parallel, one end is connected to the first rotor signal input terminal and the other end is connected to the second rotor signal input terminal.

[0040] Furthermore, the signal processing circuit includes a low-pass filter circuit and a comparator circuit;

[0041] The low-pass filter circuit includes a tenth resistor and a sixth capacitor. The first end of the tenth resistor is connected to the seventh pin of the isolation amplifier, and the second end is connected to the trigger module and / or the main control module. The first end of the sixth capacitor is connected to the second end of the tenth resistor, and the second end of the sixth capacitor is grounded.

[0042] The comparator circuit includes a comparator, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, and a seventh capacitor;

[0043] The first end of the fourteenth resistor is connected to the first end of the sixth capacitor, and the second end of the fourteenth resistor is connected to the non-inverting input of the comparator.

[0044] The first end of the eleventh resistor is connected to the power supply, and the second end is connected to the inverting input of the comparator. The first end of the twelfth resistor is grounded, and the second end is connected to the inverting input of the comparator.

[0045] The first terminal of the seventh capacitor is connected to the power supply, and the second terminal is grounded.

[0046] The first end of the thirteenth resistor is connected to the first output terminal of the comparator, and the second end is grounded.

[0047] The first output terminal of the comparator is also connected to the trigger module and / or the main control module, the second output terminal of the comparator is connected to the power supply, and the third output terminal of the comparator is grounded.

[0048] Furthermore, the main control unit also includes an interaction module and a communication module. The interaction module is connected to the main control module and is used for data visualization and obtaining setting parameters.

[0049] The communication module is connected to the main control module and is used to realize remote control and remote data interaction.

[0050] Beneficial Effects: This invention transmits rotor status signals to the triggering unit and main control unit via a three-phase rotor frequency / voltage detection module. When any one of the three independent rotor status signals is abnormal, the triggering unit generates voltage and speed regulation commands based on the corresponding signals from the remaining channels and sends them to the thyristor drive module to adjust the motor stator voltage, thereby achieving speed regulation. The main control unit compares the motor speed signal generated based on one independent rotor status signal with the motor speed signal received from the triggering unit from the corresponding line, and generates and sends a triggering unit fault warning signal when an anomaly occurs, thus promptly detecting triggering unit malfunctions. This invention ensures the controllability of speed control and significantly improves system safety. Attached Figure Description

[0051] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0052] Figure 1 This is a schematic diagram of the voltage and speed regulating device in this utility model;

[0053] Figure 2 This is a schematic diagram of the structure of the original single-channel detection, voltage regulation, and speed regulation device of this utility model;

[0054] Figure 3 This is a block diagram of the rotor redundancy detection module in this utility model;

[0055] Figure 4 This is a circuit diagram of a single-channel rotor signal isolation and step-down circuit in this utility model;

[0056] Figure 5 This is a circuit diagram of a single-channel rotor frequency and voltage detection circuit in this utility model. Detailed Implementation

[0057] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0058] This embodiment provides a voltage regulation and speed control device with redundant speed detection, in such cases... Figure 1 The traditional structure shown has been improved, and the improved structure is as follows: Figure 2 As shown, it includes: a trigger unit, a main control unit, a three-phase rotor frequency / voltage detection module, a communication unit, and a thyristor drive module;

[0059] The three-phase rotor frequency / voltage detection module is connected to the trigger unit and the main control unit respectively. It is used to independently collect the three-phase induced signals in the rotor circuit of the drive motor, and output three independent rotor status signals corresponding to each to the trigger unit, and send one of the independent rotor status signals to the main control unit.

[0060] The main control unit is connected to the triggering unit via a communication unit and is used to send speed commands to the triggering unit;

[0061] The triggering unit is used to: collect power grid status signals and motor stator operating status signals, and receive the speed command, and based on the speed command, power grid status signals and motor stator operating status signals, generate and send a thyristor triggering command to the thyristor drive module;

[0062] The triggering unit is also used to generate voltage and speed regulation commands based on the corresponding signals of the remaining three independent rotor status signals when any one of the three signals is abnormal, and send them to the thyristor drive module to adjust the motor stator voltage and thus achieve speed regulation.

[0063] Specifically, theoretically, the speed calculated based on the three-phase rotor status signals should be the same. If the triggering unit determines that the speed deviation calculated based on a certain rotor status signal exceeds the set threshold, it indicates that the acquisition of that phase line is abnormal. At this time, the voltage regulation and speed regulation command is generated using the other two normal signals.

[0064] Furthermore, the triggering unit outputs the generated motor speed signal to the main control unit for speed redundancy detection. The motor speed signal is generated based on three independent rotor status signals received.

[0065] The main control unit is used to compare the motor speed signal generated based on an independent rotor status signal with the motor speed signal corresponding to the same line received from the trigger unit to determine whether the deviation between the two motor speed signals indicates a trigger control abnormality, and to generate and send a trigger unit fault warning signal when an abnormality occurs.

[0066] Specifically, in this embodiment, the deviation between the two motor speed signals is determined by comparing whether the difference between the two motor speed signals exceeds a set threshold. If it does, it indicates an abnormality.

[0067] In a specific embodiment, the three-phase rotor frequency / voltage detection module is used to transmit the rotor frequency and the effective value of the rotor voltage to the trigger control module and the main control module.

[0068] In a specific embodiment, the triggering unit includes a triggering module, a three-phase power frequency / voltage detection module, a three-phase stator voltage detection module, and a three-phase stator current detection module connected to the triggering module;

[0069] The three-phase power frequency / voltage detection module is used to collect the grid frequency, voltage zero-crossing point and voltage RMS value, and transmit them to the trigger module.

[0070] The three-phase stator voltage detection module is used to collect the effective value of the stator voltage and transmit it to the trigger module;

[0071] The three-phase stator current detection module is used to collect the effective value of the stator current and transmit it to the trigger module.

[0072] Specifically, the trigger module combines the speed command and the collected feedback signal, calculates the target value of the stator voltage to be applied through the control algorithm, converts the target voltage value into a trigger delay angle, and sends the corresponding command to the thyristor drive module. The thyristor trigger circuit outputs the required target voltage by changing the conduction angle, thereby driving the motor to reach the desired speed. The above process is a mature technology in the field of industrial motor control and will not be elaborated here.

[0073] Specifically, the device described in this embodiment is installed in a crane's voltage and speed regulation system. The trigger module is designed to acquire the frequency and voltage signals of phases AB, BC, and CA through a three-phase rotor frequency / voltage detection module (three-channel rotor detection circuit). When the trigger module detects an abnormality in any of the three-phase signals, it can combine this with normal circuit signals to control the thyristor drive module, avoiding the speed runaway risk that occurs with single-channel signal detection. Simultaneously, this embodiment designs a redundant detection mechanism: the main control module acquires the frequency signal of phase CA and calculates the rotational speed, while also receiving the rotational speed of phase CA calculated by the trigger module. The main control module compares the difference between the two rotational speeds to see if it meets a set threshold, thereby promptly detecting abnormalities in the trigger board CPU and triggering fault protection to ensure safe production. In summary, this embodiment design can simultaneously avoid the production risks caused by failures in the three-phase acquisition circuit and trigger module failures.

[0074] Specifically, the redundancy detection mechanism involved in this utility model specifically eliminates the control risks caused by the abnormality of the trigger module when the three-phase acquisition circuit is normal.

[0075] In this embodiment, both the trigger module and the main control module use the STM32F429IGT6. Specifically, the main innovation of this embodiment lies in utilizing the existing trigger module and main control module, as well as the peripheral circuit module and the innovative three-phase rotor signal processing circuit, to achieve redundant detection of rotational speed. The specific data processing procedures of the chip (calculating rotational speed, comparing, and sending corresponding instructions) are mature and universal technologies, and therefore will not be described in detail.

[0076] Specifically, the structure of the redundancy detection mechanism is as follows: Figure 3 As shown, a dual-CPU system (trigger module and main control module) is used to synchronously acquire three frequencies and voltages from the three-phase rotor circuits (AB, BC, CA). By acquiring four rotor signals (three from the trigger board and one from the control board) through the dual CPUs, the system can maintain safe operation and improve reliability even in the event of a fault in any signal path or CPU through cross-comparison. In practice, either AB or BC can be selected for redundancy detection before transmitting the signals to the trigger module and main control module.

[0077] Specifically, the three-phase rotor frequency / voltage detection module includes a first-phase rotor frequency / voltage detection unit, a second-phase rotor frequency / voltage detection unit, and a third-phase rotor frequency / voltage detection unit;

[0078] This embodiment takes one of the signal processing circuits as an example (e.g.) Figure 4 , 5As shown in the figure, any one of the first phase rotor frequency / voltage detection unit, the second phase rotor frequency / voltage detection unit, and the third phase rotor frequency / voltage detection unit includes a signal input terminal, an input isolation and step-down circuit, and two parallel signal processing circuits.

[0079] The signal input terminal includes a first rotor signal input terminal and a second rotor signal input terminal;

[0080] The input isolation and step-down circuit is connected between the signal input terminal and the two parallel signal processing circuits, and is used to isolate and step down the input rotor induction signal.

[0081] Each of the aforementioned signal processing circuits is used to convert the rotor induction signal into an analog voltage signal and a digital frequency signal that can be recognized by both the trigger module and the main control module.

[0082] In a specific embodiment, the input isolation and step-down circuit includes an AC loop, a signal sampling and isolation circuit, and a DC voltage divider circuit;

[0083] The AC circuit includes a first resistor R19, a second resistor R20, a third resistor R21, a fourth resistor R22, and a fifth resistor R23;

[0084] Wherein, the first end of the first resistor R19 is connected to the first rotor signal input terminal (ROTOB), the second end of the first resistor R19 is connected to the first end of the second resistor R20, the second end of the second resistor R20 is connected to the first end of the third resistor R21, the second end of the third resistor R21 is connected to the first end of the fourth resistor R22, and the second end of the fourth resistor R22 is connected to the first end of the fifth resistor R23.

[0085] Specifically, the fourth resistor R22 and the fifth resistor R23 are connected in series to form a voltage divider point, so as to further precisely adjust the amplitude of the signal sent to the subsequent stage;

[0086] The signal sampling and isolation unit includes a seventh resistor R25, an isolation amplifier U6, and an isolation power supply module U5;

[0087] The first end of the seventh resistor R25 is connected to the first output pin 2 of the isolation amplifier U6, and the second end is connected to the second output pin 3 of the isolation amplifier U6; the seventh output pin 7 and the fourth output pin 4 of the isolation power supply module U5 are respectively connected to the first output pin 1 and the fourth output pin 4 of the isolation amplifier U6, thereby providing working power to the high-voltage side of the isolation amplifier U6.

[0088] Furthermore, the second end of the fifth resistor R23 is connected to the first end of the seventh resistor R25;

[0089] The fourth output pin 4 and the fifth output pin 5 of the isolated power supply module U5 are connected to the second rotor signal input terminal (ROTOA);

[0090] The DC voltage divider circuit includes a sixth resistor R24 ​​and a ninth resistor R27. The first end of the sixth resistor R24 ​​is connected to the first end of the seventh resistor R25, the second end of the sixth resistor R24 ​​is connected to the first end of the ninth resistor R27, and the second end of the ninth resistor R27 is connected to the second end of the seventh resistor R25.

[0091] Specifically, in this embodiment, the sixth resistor R24 ​​and the ninth resistor R27 are connected in series to provide a suitable DC bias point for the AC signal, ensuring that its voltage is within the linear operating range of the isolation amplifier U6.

[0092] The signal processing circuit also includes a first capacitor C11, a second capacitor C12, a third capacitor C13, a fourth capacitor C14, a fifth capacitor C15, an eighth resistor R26, a first diode D1, and a second diode D2.

[0093] The first terminal of the first capacitor C11 is connected to the first power supply (VCC3.3) for power supply decoupling and to ensure power supply stability, and the second terminal of the first capacitor C11 is grounded.

[0094] The first end of the second capacitor C12 is connected to the second power supply (+24V), the second end of the second capacitor C12 is grounded, and the first end of the second capacitor C12 is connected to the second output pin 2 of the isolation power supply module U5.

[0095] The two ends of the third capacitor C13 are connected to the first output pin 1 and the fourth output pin 4 of the isolation amplifier U6, respectively.

[0096] The two ends of the fourth capacitor C14 are respectively connected to the two ends of the eighth resistor R26.

[0097] The first terminal of the fifth capacitor C15 is connected to the second terminal of the seventh resistor R25, and the second terminal of the fifth capacitor C15 is connected to the second rotor signal input terminal (ROTOA).

[0098] The first end of the eighth resistor R26 is connected to the first end of the sixth resistor R24, and the second end of the eighth resistor R26 is connected to the second rotor signal input terminal (ROTOA).

[0099] The first diode D1 and the second diode D2 are connected in parallel, with one end connected to the first rotor signal input terminal (ROTOB) and the other end connected to the second rotor signal input terminal (ROTOA) to prevent overvoltage from impacting the isolation amplifier U6.

[0100] Specifically, in this embodiment, several capacitors are connected in parallel with a resistor or power supply for high-frequency noise filtering and decoupling, ensuring the purity of the input signal and the stability of the power supply.

[0101] Specifically, the AC circuit is used to receive the rotor input signals ROTOA and ROTOB, and to perform attenuation and impedance matching.

[0102] In a specific embodiment, the signal processing circuit includes a low-pass filter circuit and a comparator circuit;

[0103] The low-pass filter circuit includes a tenth resistor R152 and a sixth capacitor C26. The first end of the tenth resistor R152 is connected to the seventh pin 7 of the isolation amplifier U6, and the second end is connected to the trigger module and / or the main control module. The first end of the sixth capacitor C26 is connected to the second end of the tenth resistor R152, and the second end of the sixth capacitor C26 is grounded.

[0104] The comparator circuit includes comparator U23, eleventh resistor R148, twelfth resistor R149, thirteenth resistor R150, fourteenth resistor R151 and seventh capacitor C27.

[0105] The first end of the fourteenth resistor R151 is connected to the first end of the sixth capacitor C26, and the second end of the fourteenth resistor R151 is connected to the non-inverting input of comparator U23.

[0106] The first end of the eleventh resistor R148 is connected to the power supply, and the second end is connected to the inverting input of comparator U23. The first end of the twelfth resistor R149 is grounded, and the second end is connected to the inverting input of comparator U23.

[0107] The first terminal of the seventh capacitor C27 is connected to the power supply, and the second terminal is grounded.

[0108] Specifically, the eleventh resistor R148 and the twelfth resistor R149 are connected in parallel to the inverting input of comparator U23, thereby providing a stable reference voltage for the inverting input of comparator U23. Comparator U23 converts the analog signal into a square wave signal Rotor_ZCD2 (zero-crossing detection signal) synchronized with the rotor frequency, and outputs it to the pulse capture channel of the trigger module and / or the main control module for accurate frequency measurement.

[0109] Specifically, the thirteenth resistor R150, the fourteenth resistor R151, and the seventh capacitor C27 are used to improve the response of comparator U23 and suppress oscillation;

[0110] The first terminal of the thirteenth resistor R150 is connected to the first output terminal of comparator U23, and the second terminal is grounded.

[0111] The first output terminal of the comparator U23 is also connected to the trigger module and / or the main control module, the second output terminal of the comparator U23 is connected to the power supply, and the third output terminal of the comparator U23 is grounded.

[0112] Specifically, the isolation amplifier output signal ROTOR2 is filtered by a low-pass filter circuit composed of R152 and C26 to output the analog signal RO2_CPU trigger module and / or the AD sampling channel of the main control module; another path is output through comparator U23 to the square wave frequency signal Rotor_ZCD2 to the pulse sampling channel of the trigger module and / or the main control module; the reference voltage of comparator U23 is provided by a voltage divider of 3.3V through the eleventh resistor R148 and the twelfth resistor R149.

[0113] Specifically, the circuit designed in this embodiment uses isolation amplification and resistor voltage division to safely isolate and reduce the rotor voltage from 10V to 1500V to 0.01-1.5V. At the same time, it outputs both frequency and voltage signals to ensure safe isolation between the high-voltage rotor signal and the low-voltage control circuit, achieving electrical isolation while ensuring the smooth operation of redundant detection.

[0114] Specifically, this embodiment employs fiber optic communication and filtering circuit design, which can reduce signal transmission interference and improve system stability.

[0115] Specifically, this embodiment can compensate for the low-speed blind zone by using three-phase voltage detection. For example, when the rotor frequency is low and close to 0, that is, near the synchronous speed, the accuracy of fault detection using rotor frequency is low. Therefore, this embodiment combines rotor voltage detection to effectively determine the electrical condition and avoid the failure risk of simple frequency detection.

[0116] In a specific embodiment, the main control unit includes a main control module, a speed command input module connected to the main control module, and a relay control module;

[0117] The speed command input module is used to collect speed commands and transmit them to the main control module;

[0118] The relay control module is used to control the actuator to start the protection program based on the fault warning signal of the trigger unit.

[0119] Specifically, the actuators include brakes, rotor cutters, etc.

[0120] Specifically, the main control module directly receives the rotor signal from one phase of the circuit, can independently calculate a rotational speed value, and cross-compares it with the rotational speed value calculated by the trigger module to understand the current operating status of the trigger module. If the difference between the two is too large, it is judged as a fault, and safety measures are initiated.

[0121] In addition, the main control module is also used to perform speed PI adjustment, logical judgment, communicate with HMI (human-machine interface) or PLC (programmable logic controller), handle more complex tasks with slightly lower real-time requirements, and perform unified system management and display.

[0122] In a specific embodiment, the main control unit further includes an interaction module and a communication module. The interaction module is connected to the main control module and is used for data visualization and obtaining setting parameters.

[0123] The communication module is connected to the main control module and is used to realize remote control and remote data interaction.

[0124] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A voltage-regulating and speed-regulating device with redundant speed detection, characterized in that, include: Triggering unit, main control unit, three-phase rotor frequency / voltage detection module, communication unit and thyristor drive module; The three-phase rotor frequency / voltage detection module is connected to the trigger unit and the main control unit respectively. It is used to independently collect the three-phase induced signals in the rotor circuit of the drive motor, and output three independent rotor status signals corresponding to each to the trigger unit, and send one of the independent rotor status signals to the main control unit. The main control unit is connected to the triggering unit via a communication unit and is used to send speed commands to the triggering unit; The triggering unit is used to: collect power grid status signals and motor stator operating status signals, and receive the speed command, and based on the speed command, power grid status signals and motor stator operating status signals, generate and send a thyristor triggering command to the thyristor drive module; The triggering unit is also used to generate voltage and speed regulation commands based on the corresponding signals of the remaining three independent rotor status signals when any one of the three signals is abnormal, and send them to the thyristor drive module to adjust the motor stator voltage and thus achieve speed regulation. Furthermore, the triggering unit outputs the generated motor speed signal to the main control unit for speed redundancy detection. The motor speed signal is generated based on three independent rotor status signals received. The main control unit is used to compare the motor speed signal generated based on an independent rotor status signal with the motor speed signal corresponding to the same line received from the trigger unit to determine whether the deviation between the two motor speed signals indicates a trigger control abnormality, and to generate and send a trigger unit fault warning signal when an abnormality occurs.

2. The voltage regulation and speed control device with redundant speed detection according to claim 1, characterized in that, The triggering unit includes a triggering module, a three-phase power frequency / voltage detection module, a three-phase stator voltage detection module, and a three-phase stator current detection module connected to the triggering module; The three-phase power frequency / voltage detection module is used to collect the grid frequency, voltage zero-crossing point and voltage RMS value, and transmit them to the trigger module. The three-phase stator voltage detection module is used to collect the effective value of the stator voltage and transmit it to the trigger module; The three-phase stator current detection module is used to collect the effective value of the stator current and transmit it to the trigger module.

3. The voltage regulation and speed control device with redundant speed detection according to claim 2, characterized in that, The main control unit includes a main control module, a speed command input module connected to the main control module, and a relay control module; The speed command input module is used to collect speed commands and transmit them to the main control module; The relay control module is used to control the actuator to start the protection program based on the fault warning signal of the trigger unit.

4. The voltage regulation and speed control device with redundant speed detection according to claim 1, characterized in that, The three-phase rotor frequency / voltage detection module includes a first-phase rotor frequency / voltage detection unit, a second-phase rotor frequency / voltage detection unit, and a third-phase rotor frequency / voltage detection unit. Each of the first-phase rotor frequency / voltage detection unit, the second-phase rotor frequency / voltage detection unit, and the third-phase rotor frequency / voltage detection unit includes a signal input terminal, an input isolation and step-down circuit, and two parallel signal processing circuits. The signal input terminal includes a first rotor signal input terminal and a second rotor signal input terminal; The input isolation and step-down circuit is connected between the signal input terminal and the two parallel signal processing circuits, and is used to isolate and step down the input rotor induction signal. Each of the aforementioned signal processing circuits is used to convert the rotor induction signal into an analog voltage signal and a digital frequency signal that can be recognized by both the trigger module and the main control module.

5. The voltage regulation and speed control device with redundant speed detection according to claim 4, characterized in that, The input isolation and step-down circuit includes an AC loop, a signal sampling and isolation circuit, and a DC voltage divider circuit. The AC circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor, and a fifth resistor; Wherein, the first end of the first resistor is connected to the first rotor signal input end, the second end of the first resistor is connected to the first end of the second resistor, the second end of the second resistor is connected to the first end of the third resistor, the second end of the third resistor is connected to the first end of the fourth resistor, and the second end of the fourth resistor is connected to the first end of the fifth resistor. The signal sampling and isolation unit includes a seventh resistor, an isolation amplifier, and an isolation power supply module; The first end of the seventh resistor is connected to the first output pin of the isolation amplifier, and the second end is connected to the second output pin of the isolation amplifier; the seventh output pin and the fourth output pin of the isolation power supply module are respectively connected to the first output pin and the fourth output pin of the isolation amplifier. Furthermore, the second end of the fifth resistor is connected to the first end of the seventh resistor; The fourth and fifth output pins of the isolation power supply module are connected to the second rotor signal input terminal; The DC voltage divider circuit includes a sixth resistor and a ninth resistor. The first end of the sixth resistor is connected to the first end of the seventh resistor, the second end of the sixth resistor is connected to the first end of the ninth resistor, and the second end of the ninth resistor is connected to the second end of the seventh resistor. The signal processing circuit also includes a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, an eighth resistor, a first diode, and a second diode; The first terminal of the first capacitor is connected to the first power supply, and the second terminal of the first capacitor is grounded. The first terminal of the second capacitor is connected to the second power supply, the second terminal of the second capacitor is grounded, and the first terminal of the second capacitor is connected to the second output pin of the isolation power supply module. The two ends of the third capacitor are respectively connected to the first output pin 1 and the fourth output pin of the isolation amplifier; The two ends of the fourth capacitor are respectively connected to the two ends of the eighth resistor; The first terminal of the fifth capacitor is connected to the second terminal of the seventh resistor, and the second terminal of the fifth capacitor is connected to the second rotor signal input terminal. The first end of the eighth resistor is connected to the first end of the sixth resistor, and the second end of the eighth resistor is connected to the second rotor signal input terminal. After the first diode and the second diode are connected in parallel, one end is connected to the first rotor signal input terminal and the other end is connected to the second rotor signal input terminal.

6. The voltage regulation and speed control device with redundant speed detection according to claim 5, characterized in that, The signal processing circuit includes a low-pass filter circuit and a comparator circuit; The low-pass filter circuit includes a tenth resistor and a sixth capacitor. The first end of the tenth resistor is connected to the seventh pin of the isolation amplifier, and the second end is connected to the trigger module and / or the main control module. The first end of the sixth capacitor is connected to the second end of the tenth resistor, and the second end of the sixth capacitor is grounded. The comparator circuit includes a comparator, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, and a seventh capacitor; The first end of the fourteenth resistor is connected to the first end of the sixth capacitor, and the second end of the fourteenth resistor is connected to the non-inverting input of the comparator. The first end of the eleventh resistor is connected to the power supply, and the second end is connected to the inverting input of the comparator. The first end of the twelfth resistor is grounded, and the second end is connected to the inverting input of the comparator. The first terminal of the seventh capacitor is connected to the power supply, and the second terminal is grounded. The first end of the thirteenth resistor is connected to the first output terminal of the comparator, and the second end is grounded. The first output terminal of the comparator is also connected to the trigger module and / or the main control module, the second output terminal of the comparator is connected to the power supply, and the third output terminal of the comparator is grounded.

7. The voltage regulation and speed control device with redundant speed detection according to claim 6, characterized in that, The main control unit also includes an interaction module and a communication module. The interaction module is connected to the main control module and is used for data visualization and obtaining setting parameters. The communication module is connected to the main control module and is used to realize remote control and remote data interaction.

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