Closed-loop control wire drawing machine control system

Abstract

The invention relates to the technical field of control or regulation of a motor, a generator or an electromechanical transducer, and provides a closed-loop control wire drawing machine control system which comprises a PLC (Programmable Logic Controller), the PLC is connected with and controls a plurality of drivers, each driver is connected with and controls a rotary encoder, each rotary encoder is correspondingly installed on a permanent magnet synchronous motor, and each permanent magnet synchronous motor is correspondingly installed at the end of a winding drum and drives the winding drum to rotate. The PLC controller obtains the feedback frequency of the permanent magnet synchronous motor through the driver, compares the feedback frequency with a given frequency, and adjusts the given frequency based on a comparison result. The encoder device is additionally arranged at the motor end, actual output is compared with expected output, control input is adjusted according to error signals, the output is made to be close to an expected value, the anti-interference capacity is high, the control precision is high, speed matching control between a front coil and a rear coil is better, the probability of wire breakage during drawing is reduced, the drawing speed is increased, and the production efficiency is high.

Description

Technical Field

[0001] The invention relates to a closed-loop controlled wire drawing machine control system, belonging to the technical field of control or regulation of electric motors, generators or electromechanical converters. Background Art

[0002] Traditional wire drawing machines use ordinary variable frequency three-phase asynchronous motors, adopt open-loop control, and use belt drive with the load end, which has low transmission efficiency and high energy consumption. In order to improve efficiency, the current wire drawing machine equipment is driven by permanent magnet synchronous motors, which eliminates many intermediate links. The load end and the motor are directly connected by the same shaft, which has less transmission loss and high control accuracy. The drawing speed has been improved, and the production efficiency has been improved. At the same time, traditional wire drawing machines generally use open-loop control, which directly generates control output according to the given input signal, without considering the actual output results of the system, and have poor anti-interference ability and low control accuracy. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a closed-loop controlled wire drawing machine control system. The closed-loop controlled wire drawing machine control system is equipped with an encoder device at the motor end, compares the actual output of the system with the expected output, and adjusts the control input according to the error signal to make the output of the system close to the expected value, which can effectively improve the anti-interference ability and control accuracy in batches.

[0004] The present invention is achieved through the following technical solutions.

[0005] A closed-loop controlled wire drawing machine control system provided by the present invention comprises a PLC controller; the PLC controller is connected to control a plurality of drivers, each driver is connected to control a resolver encoder, each resolver encoder is correspondingly installed on a permanent magnet synchronous motor, each permanent magnet synchronous motor is correspondingly installed at the end of a reel and drives the reel to rotate; the PLC controller obtains the feedback frequency of the permanent magnet synchronous motor through the driver, compares the feedback frequency with a given frequency, adjusts the given frequency based on the comparison result, and controls the permanent magnet synchronous motor with the adjusted given frequency.

[0006] The resolver encoder is mounted on the shaft end of the permanent magnet synchronous motor.

[0007] The driver controls the permanent magnet synchronous motor in an FVC manner.

[0008] The control parameters of the driver for the permanent magnet synchronous motor are input by a PLC controller, and the control parameters include rated power, rated voltage, rated current, rated speed, rated frequency, encoding type, and resolver pole pair number.

[0009] The PLC controller is connected to multiple drivers via a CAN bus.

[0010] The driver adopts Inovance MD810 driver, and the resolver encoder is connected to the encoder interface terminal of the driver through an aviation plug.

[0011] The resolver encoder adopts the J132 series magnetoresistive resolver encoder produced by Shanghai Yingshuang Motor Technology.

[0012] The PLC controller adopts Huichuan H5U controller.

[0013] The PLC controller is also independently connected to a touch screen for control.

[0014] The beneficial effects of the present invention are: by adding an encoder device at the motor end, the actual output of the system is compared with the expected output, and the control input is adjusted according to the error signal, so that the output of the system is close to the expected value, the anti-interference ability is strong, the control accuracy is high, the speed matching control between the front and rear rolls is better, the probability of wire breakage during drawing is reduced, the drawing speed is improved, and the production efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a connection diagram of at least one embodiment of the present invention.

[0016] In the figure: 1-driver, 2-encoder interface terminal, 3-first reel, 4-first permanent magnet synchronous motor, 5-first resolver encoder, 6-PLC controller, 7-second reel, 8-second permanent magnet synchronous motor, 9-second resolver encoder, 10-touch screen. DETAILED DESCRIPTION

[0017] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the description.

[0018] Example 1

[0019] like Figure 1 A closed-loop controlled wire drawing machine control system shown includes a PLC controller 6; the PLC controller 6 is connected to control multiple drivers 1, each driver 1 is connected to control a resolver encoder, each resolver encoder is correspondingly installed on a permanent magnet synchronous motor, and each permanent magnet synchronous motor is correspondingly installed at the end of a reel and drives the reel to rotate; the PLC controller 6 obtains the feedback frequency of the permanent magnet synchronous motor through the driver 1, compares the feedback frequency with the given frequency, adjusts the given frequency based on the comparison result, and controls the permanent magnet synchronous motor with the adjusted given frequency.

[0020] Example 2

[0021] Consistent with Example 1, and further optimized in details, the resolver encoder is installed on the shaft end of the permanent magnet synchronous motor.

[0022] Furthermore, the control mode of the driver 1 for the permanent magnet synchronous motor is FVC.

[0023] Furthermore, the control parameters of the driver 1 for the permanent magnet synchronous motor are input by the PLC controller 6 , and the control parameters include rated power, rated voltage, rated current, rated speed, rated frequency, encoding type, and resolver pole pair number.

[0024] Furthermore, the driver 1 adopts the Inovance MD810 driver, and the resolver encoder is connected to the encoder interface terminal 2 of the driver 1 through an aviation plug.

[0025] Example 3

[0026] Consistent with the first embodiment and further optimized in details, the PLC controller 6 is connected to multiple drivers 1 via the CAN bus.

[0027] Furthermore, the resolver encoder adopts the J132 series magnetoresistive resolver encoder of Shanghai Yingshuang Motor Technology.

[0028] Furthermore, the PLC controller 6 adopts the Inovance H5U controller.

[0029] Furthermore, the PLC controller 6 is also independently connected to and controlled by a touch screen 10 .

[0030] Example 4

[0031] Basically consistent with the above embodiment, the encoder device is installed at the motor shaft end by using the closed-loop control system principle, corresponding to the first permanent magnet synchronous motor 4 driving the first reel 3, the second permanent magnet synchronous motor 8 driving the second reel 7... the Nth permanent magnet synchronous motor driving the Nth reel, and the first resolver encoder 4, the second resolver encoder 9, and the Nth resolver encoder are installed respectively. This system uses the resolver encoder J132XU9734M, with 4 pole pairs, 7V excitation voltage, 10KHz excitation frequency, and 3.5V output voltage. The driver uses the MD810 series, with a common bus topology and a book-type structure, which saves system power distribution costs, reduces cabinet size, and adds a resolver encoder interface. The encoder signal is connected to the resolver encoder interface of the Huichuan MD810 driver using an aviation plug, which is more secure and has a stable signal. The motor control mode is set to FVC (speed sensor vector control) on the driver. The driver accurately inputs the motor nameplate parameters (rated power, rated voltage, rated current, rated speed, rated frequency), and then inputs the resolver encoder parameters (parameter F1-28 = 2: encoder type is resolver encoder; parameter F1-34 = 4: resolver pole pair number = 4). The tuning mode is selected as synchronous machine dynamic complete tuning, and the motor parameters are identified. The driver can fully match the motor parameters to achieve better operating performance and effect. When the motor is running, the driver detects the feedback frequency of the encoder, and the driver and the PLC control system use the CANLINK bus for communication transmission; after the PLC control system reads the feedback frequency of the encoder, it is compared with the given frequency of the motor. If there is a certain error, it is adjusted through the controller to make the output frequency closer to the given frequency. During the operation of the system, real-time adjustments are continuously made; thus achieving more precise control and ensuring stable operation of the system.

[0032] The Inovance H5U controller module is used as the core of the system, the MD810 driver and the touch screen are slaves, one driver controls one permanent magnet motor, and the touch screen is used for parameter setting and system status display. The permanent magnet motor is equipped with a resolver encoder, and the encoder lead wire is connected to the driver interface with a dedicated twisted pair shielded cable. The CAN communication interface of the driver and the CAN interface of the H5U controller are connected by a network cable for communication. The H5U controller uses CANLINK communication parameter configuration added on the programming software platform. It mainly configures control commands, given frequency, operating frequency, encoder feedback frequency, and inverter status parameters. After the parameter configuration is completed. Programming is performed, and the H5U controller can send control commands and given frequencies to the driver, and the permanent magnet motor drives the load reel to operate. During the operation of the permanent magnet motor, the driver detects the frequency value of the resolver encoder and transmits it to the H5U controller through communication. The H5U controller and the touch screen are connected by Ethernet, the correct IP address is configured, each parameter screen is written on the touch screen, and the variable address of the controller is called. The parameter value of the corresponding variable can be displayed intuitively on the touch screen. When the feedback frequency of the encoder is inconsistent with the operating frequency given by the driver, the system needs to make real-time adjustments or check whether the signal connection of the encoder is normal. Make the feedback frequency consistent with the operating frequency, so as to achieve the stability of the wire drawing machine system and prevent wire breakage.

[0033] Thus, the present invention:

[0034] 1. Adopt closed-loop control automatic adjustment technology with high control accuracy;

[0035] 2. The encoder adopts a rotary transformer, and the feedback is more accurate and reliable at low speed;

[0036] 3. The speed matching between the front and rear rolls is better, the pulling speed is fast, and the user's production efficiency is improved.

Claims

1. A closed-loop control system for a wire drawing machine, comprising a PLC controller (6), characterized in that: The PLC controller (6) is connected to control a plurality of drivers (1), each driver (1) is connected to control a resolver encoder, each resolver encoder is correspondingly mounted on a permanent magnet synchronous motor, each permanent magnet synchronous motor is correspondingly mounted at the end of a reel and drives the reel to rotate; the PLC controller (6) obtains the feedback frequency of the permanent magnet synchronous motor through the driver (1), compares the feedback frequency with a given frequency, adjusts the given frequency based on the comparison result, and controls the permanent magnet synchronous motor with the adjusted given frequency.

2. The closed-loop controlled wire drawing machine control system according to claim 1, characterized in that: The resolver encoder is mounted on the shaft end of the permanent magnet synchronous motor.

3. The closed-loop controlled wire drawing machine control system according to claim 1, characterized in that: The driver (1) controls the permanent magnet synchronous motor in an FVC manner.

4. The closed-loop controlled wire drawing machine control system according to claim 1, characterized in that: The control parameters of the driver (1) for the permanent magnet synchronous motor are inputted by a PLC controller (6), and the control parameters include rated power, rated voltage, rated current, rated speed, rated frequency, encoding type, and resolver pole pair number.

5. The closed-loop controlled wire drawing machine control system according to claim 1, characterized in that: The PLC controller (6) is connected to a plurality of drivers (1) via a CAN bus.

6. The closed-loop controlled wire drawing machine control system according to claim 1, characterized in that: The driver (1) adopts the Inovance MD810 driver, and the resolver encoder is connected to the encoder interface terminal (2) of the driver (1) via an aviation plug.

7. The closed-loop controlled wire drawing machine control system according to claim 1, characterized in that: The resolver encoder adopts the J132 series magnetoresistive resolver encoder produced by Shanghai Yingshuang Motor Technology.

8. The closed-loop controlled wire drawing machine control system according to claim 1, characterized in that: The PLC controller (6) adopts the Inovance H5U controller.

9. The closed-loop controlled wire drawing machine control system according to claim 1, characterized in that: The PLC controller (6) is also independently connected to and controlled by a touch screen (10).

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