KR20100004497U - Welder and welding system - Google Patents

Abstract

A welding machine for controlling a motor of a welding wire supply device in which a welding wire is supplied by a motor whose speed is determined according to an applied voltage, and supplying operating power to the motor, wherein the speed information of the motor is obtained from the welding wire supply device. A constant speed command unit configured to increase or decrease a reference voltage for the operating power of the motor according to the received speed information; And a motor driving unit having a voltage supply terminal for supplying a voltage to the motor, and controlling a supply voltage detected at the voltage supply terminal according to the reference voltage supplied from the constant speed command unit. One welding system is provided.

Welder, Welding Wire, Wire Feeder, WELDER, WIRE FEEDER

Description

Welder and Welding System {WELDER AND WELDING SYSTEM}

The present invention relates to a welding machine and a welding system, and more particularly, to a welding system including a welder and a welder and a welding wire feeding device capable of controlling the constant speed of the motor for feeding the welding wire in the welding wire feeding device. .

Conventional welding systems used to weld ships, containers, steels, etc. are responsible for the welding wire feeding device having a motor for supplying the welding wire to the welding point, and the control of the motor in the welding wire feeding device, It consists of a welder that supplies power for driving the motor and, if necessary, for welding.

Since the welder must be connected to an external power source, it should generally be near an external power source and the welding wire feeder should be close to the welding work site. That is, the position of the welding machine is almost fixed during the welding operation, but the position of the welding wire supply device is generally changed according to the welding operation place. Therefore, the main body and the welding wire feeding device are connected by a predetermined power supply cable and / or a control cable (hereinafter referred to as a cable).

This general welding system 10 is briefly shown in FIG. As shown in FIG. 1, the welding system 10 includes a welding machine 11 and a welding wire feeding device 12, and a cable 13 connecting the welding machine 11 and the welding wire feeding device 12. do. As described above, the welder 11 is connected to an external power supply (not shown), and the welding wire supply device 12 is installed near the welding work place to supply the welding wire to the welding point.

In the welding system 10, in order to improve welding quality during welding, the welding wire must be constantly fed while maintaining a predetermined speed at the welding point. Excellent welding when the feeding speed of the welding wire is slower or faster than the feeding speed of the welding wire required for the welding operation, or when the feeding speed of the welding wire is not kept constant and fluctuates with time by the external environment. Quality is difficult to guarantee Therefore, it is necessary to keep the wire feeding speed constant at a predetermined value, and for this purpose, it is necessary to keep the rotational speed of the motor directly related to the wire feeding speed constant.

On the other hand, the rotational speed of the motor depends on the voltage applied to the motor, for example, when a high magnitude of voltage is applied, the rotational speed of the motor increases, and conversely, when a low magnitude of voltage is applied, the rotational speed of the motor decreases. do. Therefore, in order to maintain a constant rotation speed of the motor, a constant voltage must be supplied to the motor.

On the other hand, conventionally, a method of detecting a voltage supplied to a motor by a welding machine and comparing it with a reference value, and adjusting the voltage supplied to the motor to be equal to the reference value, controls the speed of the motor. However, as described above, when the distance between the welder 11 and the welding wire supply device 12 is far, the voltage drop in the cable 13 occurs, which is directly applied to the magnitude of the voltage supplied from the welder and the motor. The magnitude of the voltage is changed, and accordingly, there is a problem that the supply of the welding wire is not desired due to the difference in the magnitude of the voltage, which may adversely affect the welding quality.

The present invention is devised to solve the above-described problems, one object according to an embodiment of the present invention is a welding machine and a welding wire to enable the supply of the welding wire supply in the welding wire supply apparatus at a predetermined speed It is to provide a welding system comprising a feeding device.

In the welding machine according to an embodiment of the present invention, in the welding machine for controlling the motor of the welding wire supply device to which the welding wire is fed by a motor whose speed is determined according to the applied voltage, and supplying operating power to the motor, A constant speed command unit that receives the speed information of the motor from the welding wire supply device and increases or decreases a reference voltage for the operating power of the motor according to the speed information received from the welding wire supply device; And a motor driving unit having a voltage supply terminal for supplying a voltage to the motor, and controlling a supply voltage detected at the voltage supply terminal according to the reference voltage supplied from the constant speed command unit.

Preferably, the constant speed command unit increases or decreases the reference voltage so that the speed of the motor maintains a predetermined speed.

Preferably, the motor driver controls the supply voltage such that the supply voltage is equal to the reference voltage.

According to another embodiment of the present invention, the above-described welding machine; A welding wire feeding device having a motor for feeding a welding wire, providing speed information of the motor to the welding machine, and receiving operating power for operating the motor from the welding machine; And a cable connected between the welder and the welding wire feeding device, for transmitting the speed information from the welding wire feeding device to the welding machine and supplying the operating power from the welding machine to the welding wire feeding device. A system is provided.

According to the embodiment of the present invention, there is an effect that can control the speed of the motor for feeding the wire in the welding wire supply apparatus to a predetermined speed.

According to one embodiment of the present invention, the welding quality is improved by supplying a welding wire in accordance with the welding voltage.

Hereinafter, a welder and a welding system according to an embodiment of the present invention will be described with reference to the accompanying drawings. In the accompanying drawings, like or identical components are designated by like or identical reference numerals.

The welding system according to the present invention has a configuration similar to that of a general welding system. That is, similar to the conventional welding system 10 described with reference to FIG. 1, the welding system according to the present invention also includes a welder 11, a welding wire feeding device 12, and a cable 13.

2 shows a block diagram of a welding system 200 according to one embodiment of the present invention. As shown in FIG. 2, the welding system 200 according to an embodiment of the present invention includes a welder 210, a welding wire supply device 220, and a cable 230. In addition to the welding system 200 as a whole, it should be noted that only the welder 210 except for the welding wire feeding device 220 and the cable 230 may be provided according to one embodiment of the present invention.

The welder 210 according to an embodiment of the present invention controls the operation of the motor 221 of the welding wire supply device 220 that supplies power to supply the welding wire and the speed is determined according to the reference voltage. The operating power is supplied to the motor 221.

The welding machine 210 receives the speed information of the motor 221 from the welding wire supply device 220, and the constant speed command to increase or decrease the reference voltage with respect to the operating voltage of the motor 221 according to the speed information. And a voltage supply terminal 213 for supplying an operating voltage to the motor 221. The voltage supply terminal 213 is provided in accordance with the reference voltage supplied from the constant speed command unit 211. And a motor driver 212 for controlling the detected supply voltage.

The welding wire supply device 220 is a motor 221 for providing power to feed the welding wire as described above, and the encoder 222 for detecting the speed information of the motor and providing it to the constant speed command unit 211 It may include.

In addition, the welder 210 and the welding wire supply device 220 is connected by a cable 230, this cable 230 may also be included in the welding system 200 according to an embodiment of the present invention. Speed information of the motor 221 and operating power of the motor 221 may be transmitted through the cable 230.

3 is a flow chart illustrating an operation flow of the welder 210 or the welding system 200 according to an embodiment of the present invention. As shown in FIG. 3, the operation method of the welder 210 or the welding system 200 according to the exemplary embodiment of the present invention includes detecting a speed of the motor 221 (S310) and the motor 221. Measuring whether the speed is a predetermined speed (S320), when the speed of the motor 221 is not the same as a preset speed, increasing or decreasing a reference voltage with respect to an operating voltage of the motor 221 (S330), Detecting a voltage supplied to the motor 221 (S340), determining whether the supply voltage is equal to the increased or decreased reference voltage (S350), and when the supply voltage is not equal to the increased or decreased reference voltage, the motor Increasing or decreasing the voltage supplied to the 221 (S360).

Next, with reference to Figures 2 and 3, the operation and operation of the welder 210 or the welding system 200 according to an embodiment of the present invention.

The general welding system 200 to turn on the power to perform the welding operation, then to adjust the welding wire supply device 220 to weld through the torch. At this time, the strength of the welding (for example, indicated by a current value such as 600 A in the welding machine) is adjusted according to the type of welding operation, and the wire feeding speed of the welding wire feeding device 220 is also adjusted correspondingly. In this case, the wire feeding speed varies depending on the speed of the motor 221 provided in the welding wire feeding device. Therefore, the wire feeding speed is adjusted by adjusting the speed of the motor 221.

In order to control the speed of the motor 221, the speed of the motor 221 is first detected (S310). The speed of the motor 221 may be detected by, for example, a speed detection device (not shown) provided in the welding wire supply device 220. The speed detecting device for detecting the speed of the motor 221 may use a general motor speed detecting device, for example, a known speed detecting device such as a hall sensor, a light detecting sensor, etc., but the present invention is limited to such a speed detecting device. It is to be noted that the present invention includes a motor, that is, any device capable of detecting a speed in a rotating device.

The speed information detected by the speed detecting device may be converted into a digital signal through the encoder 222 and supplied to the welder 210 in order to facilitate processing of information in the welder 210. The speed information detected by the welding wire supply device 220 is supplied to the constant speed command unit 211 of the welder 210.

Also, instead of this, the speed information detected by the speed detecting device may be supplied to the welder 210 as an analog signal, and the speed information is converted into a digital signal through an encoder in the welder 210, thereby providing the constant speed command. It may be supplied to the unit 211. In FIG. 2, the encoder 222 is shown as being provided in the welding wire supply device 210, but the present invention is not limited thereto, and the encoder may be provided in the welding machine.

The constant speed command unit 211 calculates the speed of the motor 221 from the supplied speed information to determine whether the calculated motor speed is the same as the preset speed (S320), and if it is the same as the preset speed, step S310. If it is not the same, the reference voltage is increased or decreased (S330). That is, the constant speed command unit 211 increases the reference voltage when the speed of the motor 221 is lower than the preset speed, and decreases the reference voltage when the motor speed is higher than the preset speed. Therefore, the control of the motor driving unit 212 to be described later through this control to maintain a constant value of the speed of the motor 221.

In the initial stage of operation of the welder 210 or the welding system 200, the reference voltage is set to a value matched to a preset welding operation, and then varies according to the detected speed of the motor 221. In this case, a constant value may be added to or subtracted from the reference voltage regardless of the magnitude of the difference between the motor speed and the preset speed. Instead, the reference voltage may be applied to the reference voltage according to the difference between the speed of the motor 221 and the preset speed. You can vary the size that is added or subtracted. On the other hand, when it is determined whether the speed of the motor 221 is equal to the preset speed (S320), the meaning that the motor speed has the same value as the preset speed means that the motor speed is exactly the same value as the preset speed. It should be noted that the present invention includes not only the case of having the motor speed but also the case where the motor speed is within a preset tolerance range.

After the reference voltage is increased or decreased, the constant speed command unit 211 supplies the increased or decreased reference voltage to the motor driver 212, and the motor driver 212 supplies the motor supply voltage according to the supplied reference voltage. At this time, the motor driver 212 detects a voltage supplied to the motor 221 from the voltage supply terminal 213 provided in the motor driver 212 (S340). That is, the magnitude of the supply voltage supplied to the motor 221 is detected at the voltage supply terminal 213. Then, the motor driver 212 determines whether the detected supply voltage and the reference voltage supplied from the constant speed command unit 211 are the same (S350), and if the supply voltage is the same as the reference voltage, the process proceeds to step S310. If it is not the same, the supply voltage is increased or decreased (S360). That is, the motor driver 212 increases the supply voltage when the supply voltage is lower than the reference voltage, and decreases the reference voltage when the motor speed is higher than the preset speed.

In this case, the supply voltage can be increased by a constant voltage irrespective of the magnitude of the difference between the supply voltage and the reference voltage. Instead, the magnitude of the supply voltage is increased or decreased according to the magnitude of the difference between the supply voltage and the reference voltage. Can be different. On the other hand, as in the case of the motor speed described above, when determining whether the supply voltage is equal to the reference voltage (S350), the meaning that the supply voltage has the same value as the reference voltage means that the supply voltage is exactly the same as the reference voltage It should be noted that the present invention includes not only a case in which a voltage is supplied but also a case in which a supply voltage exists within a preset error range.

In this manner, a double feedback structure may be used to detect the motor speed and vary the reference voltage through feedback according to the detected speed, and to vary the voltage supplied from the welder to the motor through feedback according to the detected reference voltage. In addition, the dual feedback control has an effect of controlling the motor speed to a predetermined speed.

Therefore, the motor detected even if the voltage directly supplied to the motor 221 is lowered due to the voltage drop by the cable 230 while being output from the motor driver 212 and supplied to the motor 221 through the cable 230. By increasing the reference voltage from the speed, and thereby increasing the output voltage from the motor driver 212, the magnitude of the voltage actually applied to the motor 221 can always maintain a constant value, and thus the motor 221 The speed can be kept constant. In addition, even if the voltage supplied to the motor is unstable due to external factors, the motor 221 may be operated at a constant speed in the same manner as described above. Therefore, since the speed of the motor is kept constant, the welding wire supplied by the motor can also be supplied at a constant speed to the welding point, which can contribute to the improvement of welding quality.

On the other hand, the welding wire supply device 220 and the welder 210 is connected by a cable 230, the cable 230 is the speed information from the welding wire supply device 220 to the welder 210 In addition, the operating power of the motor 221 may be supplied from the welder 210. In addition, the cable 230 may transmit other control signals for operating the welding wire system 200, and various power sources for driving the welding wire supply device 210 in addition to the operating power source of the motor 221. Can also be supplied.

In addition, although the cable 230 is shown as being separated in FIG. 3, this is for explanation, and the cable 230 may be a cable in which a cable for speed information and a cable for an operating power source are integrated, and a cable for a power source. And control cable may be provided separately.

Meanwhile, although an embodiment of controlling a voltage supplied to a motor according to a reference voltage while controlling to set a reference voltage according to a motor speed has been described, in another embodiment of the present invention, a control for adjusting a supply voltage according to a reference voltage is provided. It should be noted that control can be made to set the reference voltage according to the motor speed.

The present invention is not limited by the above-described embodiments and the accompanying drawings, but is defined by the appended claims. Therefore, it will be apparent to those skilled in the art that various forms of substitution, modification, and alteration are possible without departing from the technical spirit of the present invention described in the claims, and also the appended claims. Will belong to the technical spirit described in.

1 shows a conceptual diagram of a conventional welding system.

2 shows a block diagram of a welder and a welding system according to an embodiment of the present invention.

3 shows an operational flowchart of a welder and a welding system according to an embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

10, 100: welding system

11, 210: welding machine

12, 220: welding wire feeding device

13, 230: cable

211: constant speed command

212: motor drive unit

213: voltage supply terminal

221: motor

222: Encoder

Claims (5)

In the welding machine for controlling the motor of the welding wire supply device to which the welding wire is fed by a motor whose speed is determined in accordance with the applied voltage and supplying operating power to the motor, A constant speed command unit that receives the speed information of the motor from the welding wire supply device and increases or decreases a reference voltage for the operating power of the motor according to the speed information received from the welding wire supply device; And A motor driver having a voltage supply terminal for supplying a voltage to the motor, and controlling a supply voltage detected at the voltage supply terminal according to the reference voltage supplied from the constant speed command unit; Welder comprising a. The method of claim 1, And the constant speed command unit increases and decreases the reference voltage so that the speed of the motor maintains a predetermined speed. The method of claim 1, And the motor driver controls the supply voltage such that the supply voltage is equal to the reference voltage. The method of claim 1, And the speed information is supplied by an encoder encoding the speed of the motor. A welding machine according to any one of claims 1 to 4; A welding wire feeding device having a motor for feeding a welding wire, providing speed information of the motor to the welding machine, and receiving operating power for operating the motor from the welding machine; And A cable connected between the welder and the welding wire feeding device, for transmitting the speed information from the welding wire feeding device to the welding machine and supplying the operating power from the welding machine to the welding wire feeding device; Welding system comprising a.

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