KR101036655B1 - Motor movement sensing device - Google Patents

Abstract

The present invention relates to a motor motion detection device, and more particularly, to a motor motion detection device capable of removing noise included in a signal input according to a motor motion. Motor motion detection apparatus according to an aspect of the present invention includes a motor, the motor unit for generating and outputting a motor operation signal by detecting the rotational speed of the motor when the power is supplied and activated, the motor operation signal is input The charging and discharging unit for generating and outputting a charging signal corresponding to the charging and discharging unit, when the charging signal is input from the charging and discharging unit according to a preset method to generate and output a conversion charging signal corresponding to the charging signal and the charging signal and a predetermined threshold value The comparison unit includes a comparison unit that determines whether the motor unit is operated. According to the present invention can provide a motor motion detection device that can prevent the damage caused by in situ welding.

Welding, encoder, rms, varistor

Description

Motor movement sensing device

The present invention relates to a motor motion detection device, and more particularly, to a motor motion detection device capable of removing noise included in a signal input according to a motor motion.

The automatic welding device means a welding device that automatically controls the current, generates the arc, supplies the electrode, and performs welding at a constant speed in arc welding. The automatic welding device is provided with a welding device body having a built-in rotary bar rotated by a motor and a torch for welding a welding object. Therefore, when power is supplied to the motor to rotate the rotating bar, the automatic welding device moves and welds the welding object.

However, when the welding object is welded in the state where the automatic welding device is not moved (that is, in-situ welding is performed), there is a problem in that the welding object may be broken. That is, when excessive welding is performed by in-situ welding, physical damage such as blow holes or distortion of the welding object may occur, and a part of the welding object may be diffused into the electrode. Damage may occur.

Therefore, in order to solve the problems caused by the above-described in-situ welding, it is necessary to accurately determine whether the automatic welding apparatus performs in-situ welding, and to perform a welding in situ, a technique capable of stopping the welding is required.

At this time, the speed at which the automatic welding device moves cannot always be constant. In particular, when welding is performed while the automatic welding device moves at a low speed, there is a problem that the automatic welding device operates while moving but can be recognized as stopped. In addition, since the environment in which the automatic welding device is operated may emit high power energy, there is also a problem in that spike noise is frequently generated due to high frequency.

In order to solve the above problems, the present invention is to provide a device that can detect the operation of the motor of the automatic welding device.

In addition, the present invention is to provide a motion detection device of the motor that can correct the error caused by the low-speed operation of the automatic welding device.

In addition, the present invention is to provide a motion detection device of a motor that can ensure the stability of the operation by removing the spike noise that may occur according to the use environment.

According to an aspect of the invention, the motor is included, the motor unit for detecting the rotational speed of the motor to generate and output a motor operation signal when the power is supplied and activated; A charge / discharge unit configured to generate and output a charging signal corresponding to the motor operation signal when the motor operation signal is input; A conversion unit generating and outputting a conversion charging signal corresponding to the charging signal according to a preset method when the charging signal is input from the charging and discharging unit; And a comparing unit comparing the charging signal with a preset threshold to determine whether the motor unit is operating.

Here, the motor operation signal output from the motor unit may be a single motor operation signal of a single ended method.

The motor operation detecting apparatus may further include a line receiving unit which receives the single motor operation signal from the motor unit and converts the single motor operation signal into a differential motor operation signal of a differential type.

The converter may generate the converted charge signal by calculating an effective value of the charge signal.

The motor motion detecting apparatus may further include a noise removing unit for removing the noise included in the single motor operation signal and outputting the noise to the line receiving unit when the single motor operation signal is input from the motor unit. It may include one or more of a diode or a varistor.

According to the present invention can provide a motor motion detection device that can prevent the damage caused by in situ welding.

In addition, according to the present invention, it is possible to provide a motor motion detection device that can solve the problem caused by the malfunction due to the low-speed movement of the provided motor.

In addition, when the present invention is provided in the automatic welding device, it is possible to reduce the damage to the common mode noise that may occur according to the welding environment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic configuration diagram of a motor motion detection apparatus according to an embodiment of the present invention.

Referring to FIG. 1, the motor motion detection apparatus 100 according to an embodiment of the present invention includes a motor unit 110, a noise removing unit 120, a line receiving unit 130, a charge / discharge unit 140, and a conversion unit ( 150, a comparison unit 160, and a welding control unit 170. Here, the motor motion detection apparatus 100 may be included in the automatic welding device (not shown), may be located outside the automatic welding device (not shown). When the motor motion detection device 100 is located outside the automatic welding device (not shown), the motor motion detection device 100 may exchange signals with the automatic welding device (not shown) via wireless and / or wired. have. Hereinafter, it will be described on the assumption that the motor motion detection device 100 is included in the automatic welding device (not shown). Here, it is assumed and described that the automatic welding device (not shown) includes a motor motion detection device 100 according to an embodiment of the present invention, but this is only an embodiment of the present invention. Accordingly, it is obvious that the motor motion detection device 100 according to the present invention may be included in the electronic device that needs to detect whether the motor is rotated even if the automatic welding device is not shown. Hereinafter, the operation of each component of the motor motion detection apparatus 100 will be described with reference to FIG. 1.

The motor unit 110 is activated when the power is supplied to drive the included motor (not shown) to allow the automatic welding device (not shown) to physically move. That is, the automatic welding device (not shown) may weld the welding object while moving as the motor unit 110 is activated. In particular, the motor unit 110 may further include an encoder (not shown), the encoder (not shown) detects the rotational speed of the motor and outputs a motor operation signal. Here, the motor operation signal may be a digital signal output from the encoder, and outputting the motor operation signal from the encoder (not shown) is obvious to those skilled in the art, and thus a detailed description thereof may be omitted.

The noise removing unit 120 removes sparks, static electricity, electromagnetic interference, etc. of the electrical contacts before the motor operation signal is input to the line receiving unit 130. That is, the noise removing unit 120 removes noise such as high voltage and static electricity included in the motor operation signal received from the motor unit 110. Here, the noise removing unit 120 may include a varistor, a zener diode, or the like.

Since the varistor or the zener diode has a characteristic that the resistance value is rapidly decreased when a voltage exceeding a preset voltage is applied, the noise removing unit 120 may detect a motor motion detection device from an overcurrent caused by static electricity or electromagnetic interference, which may occur according to a welding environment. 100) can be protected. That is, noise such as static electricity may generate a high voltage of tens of thousands of volts or more instantaneously, and if not removed, the motor motion detection apparatus 100 may be damaged, so the noise removing unit 120 may bypass the function of removing them. To perform.

The line receiver 130 receives the motor operation signal from which the static electricity and / or the high voltage is removed by the noise removing unit 120, converts the motor operation signal into a differential type signal, and outputs the signal. That is, the received motor operation signal may be a single ended signal (hereinafter, referred to as a single motor operation signal), and the line receiver 130 may convert the single motor operation signal into a differential signal (hereinafter, differential). Motor operation signal) to be converted and output. The single-ended method uses a single signal line with ground as a reference potential, and the single-ended signal has a weak characteristic against common mode noise. Accordingly, the line receiver 130 removes the common mode noise by changing the single motor operation signal to the differential motor operation signal.

Hereinafter, the operation of the line receiver 130 will be described in detail with reference to FIG. 2.

2 is a diagram illustrating an operation of a line receiver according to an exemplary embodiment of the present invention.

Referring to FIG. 2, the single motor operation signal 210 input to the non-inverting input terminal of the line receiving unit 130, the single motor operation signal 220 input to the inverting input terminal of the line receiving unit 130, and the line. The differential motor operation signal 230 output from the output terminal of the receiver 130 is shown. That is, the line receiver 130 includes an inverting input terminal and a non-inverting input terminal corresponding to one single motor operation signal, and one output terminal for outputting one differential motor operation signal. In this case, when the motor unit 110 includes n motors (where n is a natural number), and the single motor operation signal output from each of the n motors is input to the line receiver 130, each single motor operation is performed. N inverting input terminals, n non-inverting input terminals, and n output terminals corresponding to the signal may be included in the line receiving unit 130.

The line receiver 130 subtracts the single motor operation signal 210 inputted to the non-inverting input terminal and the single motor operation signal 220 inputted to the inverting input terminal of the line receiver 130 based on a preset reference signal value. To convert the differential motor operation signal. For example, when the single motor operation signal 210 input to the non-inverting input terminal is high and the voltage at this time is 2.5 [V] greater than the reference signal value, the single motor operation signal input to the inverting input terminal. 220 will be low, and the voltage at this time will be 2.5 [V] less than the reference signal value. Therefore, the line receiver 130 may include a differential amplifier, and in the above-described case, the line receiver 130 may output a value of 2.5-(-2.5) = 5 [V] corresponding to high. have.

Hereinafter, the operation of the line receiver 130 when noise occurs in the line receiver 130 will be described with reference to FIG. 3.

3 is a diagram illustrating an operation when common mode noise occurs in the line receiving unit.

Referring to FIG. 3, the single motor operation signal 310 in which the common mode noise input to the non-inverting input terminal of the line receiving unit 130 is generated, and the common mode noise input to the inverting input terminal of the line receiving unit 130 are generated. The single motor operation signal 320 and the differential motor operation signal 330 output from the output terminal of the line receiving unit 130 are shown.

That is, the common mode noise acts the same on the same phase of the signal input to the inverting input terminal and the signal input to the non-inverting input terminal as shown in FIG. Accordingly, as shown in FIG. 3, the differential motor operation signal 330 from which noise is removed is output. This is because the same common mode noise is applied to the same phase of each signal, so if the two signals are subtracted, the signal from which the noise is removed is output. As a result, the line receiver 130 may remove the common mode noise.

Referring back to FIG. 1, the charge / discharge unit 140 may receive a differential motor operation signal from the line receiver 130 to charge or discharge a corresponding voltage to output a charge signal. That is, the charging and discharging unit 140 may include an energy storage element (eg, a capacitor), and the charging and discharging unit 140 may supply corresponding energy when the differential motor operation signal is input under an initial condition 0 [J]. It can be charged or discharged, and the capacitor voltage at this time is called a charge signal. Hereinafter, the operation of the charge / discharge unit 140 will be described in detail with reference to FIG. 4.

4 is a circuit diagram of a charge and discharge unit according to an embodiment of the present invention.

,

)을 포함할 수 있다. 또한, 충방전부(140)에는 디퍼렌셜 모터동작신호가 입력되는 입력단자(

단자) 및 출력신호인 커패시터 전압을 출력하는 출력단자(

단자)가 더 포함될 수 있다. 즉, 초기 조건 0[J]에서 디퍼렌셜 모터동작신호가 하이(High)의 값으로 입력단자(

단자)에 입력되면 커패시터에는 미리 설정된 시상수에 따라 전하가 충전된다. 또한, 디퍼렌셜 모터동작신호가 로우(Low)의 값으로 전환되면 커패시터에는 미리 설정된 시상수에 따라 전하가 방전된다. Referring to FIG. 4, the charge / discharge unit 140 may include one capacitor C [F] and one or more resistors (here,

,

) May be included. In addition, the charging and discharging unit 140 has an input terminal for inputting a differential motor operation signal (

Terminal) and an output terminal for outputting a capacitor voltage as an output signal (

Terminals) may be further included. That is, under the initial condition 0 [J], the differential motor operation signal is set to the high value of the input terminal (

Terminal), the capacitor is charged with a predetermined time constant. In addition, when the differential motor operation signal is converted to a low value, charge is discharged to the capacitor according to a predetermined time constant.

와

를 합한 값이 5[kΩ]인 경우를 가정한다. 이 경우 시상수는

이므로 0.5[sec]가 된다. 따라서, 충방전부(140)에서 초기 조건 0[J]에서 출력단자의 최대값의 63[%]를 충전하기 위하여 걸리는 시간은 대략 0.5초에 해당한다.Here, the value of the time constant may vary depending on the resistance value and the capacitor value. For example, the capacitor value is 100 [uF]

Wow

Assume that the sum of the values is 5 [kΩ]. In this case, the time constant is

Is 0.5 [sec]. Therefore, the charging and discharging unit 140 takes approximately 0.5 seconds to charge 63 [%] of the maximum value of the output terminal under the initial condition 0 [J].

However, when the automatic welding device (not shown) performs the welding operation while moving at a low speed, the frequency of the (differential) motor operation signal is small so that a constant charging signal cannot be output from the charging / discharging unit 140. That is, when the frequency of the motor operation signal input to the charging and discharging unit 140 is small, the output charging signal is not constant and changes continuously at every moment according to the high and low repetition of the motor operation signal (that is, The charging signal is rocking).

Particularly, when the charging signal is smaller than the preset lower limit value, the automatic welding device (not shown) is preset to recognize that the automatic welding device (not shown) is stopped. There is a problem that can be changed repeatedly. In addition, when the charging signal is greater than the upper limit in advance, if the automatic welding device (not shown) is set in advance to recognize that the stop, if the above-mentioned fluctuation of the charging signal occurs near the upper limit, whether or not the automatic welding device is repeatedly There is also a problem that can be changed.

In addition, when the noise according to the welding environment is input to the charge / discharge unit 140 together with the motor operation signal, the size of the fluctuation may be increased. Of course, if the capacity of the capacitor included in the charging and discharging unit 140 is increased, the above-mentioned problem may be solved. In this case, the reaction of the motor motion detecting apparatus 100 may be slowed down, which may cause a larger problem. . Accordingly, the motor motion detection apparatus 100 according to an embodiment of the present invention includes a conversion unit 150 as shown in FIG. 1.

Referring back to FIG. 1, the conversion unit 150 sets the charging signal (for example, the output voltage of the capacitor included in the charging / discharging unit 140) output from the charging / discharging unit 140 to a predetermined value according to a preset method. It converts (hereinafter referred to as a conversion charge signal) and outputs it. For example, when the charging signal is input, the conversion unit 150 may calculate an RMS value of the charging signal and output the RMS value as a conversion charging signal. The method of calculating the effective value of the charging signal f (t) by the conversion unit 150 is as shown in Equations (1) and (2) below.

(1)

(One)

(2)

(2)

That is, after separating the charging signal f (t) into m samples (where m is a natural number), the effective value of f (t) can be calculated for each sample by using Equation (2). In addition, the conversion unit 150 may calculate the effective value of the charging signal f (t) by the following equation (3).

(3)

(3)

)에서의 연속적인 충전신호 f(t)에 대한 실효값은 상기한 식(3)과 같다. 따라서, 변환부(150)는 상술한 방법(수식)에 의하여 충전신호의 실효값을 산출할 수 있다. 그런데, 변환부(150)가 상술한 식(1) 및 식(2) 및/또는 식(3)에 의하여 실효값을 산출하는 경우 정확한 실효값이 산출될 수 있으나, 매 순간마다 충전신호를 샘플링하여 실효값을 산출해야 하는 등 과도하게 많은 연산을 수행하게 되는 문제점이 있을 수 있다. 따라서, 변환부(150)는 상술한 식 (1)에서 샘플링된 m개의 함수 중 미리 설정된 하나 이상의 함수만을 이용하여 충전신호의 실효값을 산출할 수도 있을 것이다.That is, between certain times (

The rms value for the continuous charging signal f (t) in < RTI ID = 0.0 > Therefore, the conversion unit 150 may calculate the effective value of the charging signal by the method (formula) described above. However, when the conversion unit 150 calculates an effective value by the above-described equations (1) and (2) and / or equation (3), the exact effective value may be calculated, but the charging signal is sampled every moment. Therefore, there may be a problem in that an excessive number of calculations are performed, such as an effective value. Therefore, the conversion unit 150 may calculate the effective value of the charging signal using only one or more preset functions among the m functions sampled in Equation (1).

The comparison unit 160 determines whether the motor unit 110 operates by comparing the input conversion charging signal (for example, the effective value of the above-described charging signal) with a preset threshold value. For example, the comparison unit 160 may determine that the motor unit 110 is operating when the conversion charge signal is a value between a predetermined upper limit value and a lower limit value. That is, the manufacturer of the motor motion detection 100 can know in advance the minimum speed and / or the maximum speed during the operation of the automatic welding device (not shown) by the motor included in the motor unit 110, accordingly, the upper limit accordingly The threshold value and / or the lower limit value can be set in advance.

In this case, the manufacturer may set the upper limit value and / or the lower limit value in consideration of various noises such as electromagnetic waves that may occur frequently during the welding operation. In other words, when the motor (not shown) of the motor unit 110 operates at the maximum speed by the experiment, the conversion charge signal is 5 [V], and when the motor operates at the lowest speed, the conversion charge signal is 1 [V]. Assume In this case, the upper limit value may be set to 6 [V], and the lower limit value may be set to 0.5 [] V for noise margin.

In addition, when it is determined that the motor unit 110 is activated (that is, the motor (not shown) is in operation), the comparator 160 outputs a motor operation signal and is deactivated (that is, the motor (not shown). C) is stopped, a motor stop signal can be generated and output.

The welding controller 170 controls whether the automatic welding device (not shown) is welded using the signal received from the comparator 160. That is, it is assumed that the automatic welding device (not shown) is performing a welding operation. In this case, when the motor operation signal is received, the welding controller 170 may control the automatic welding device (not shown) to continue the welding operation that is continued (that is, the welding controller 170 may receive the motor operation signal). May not perform any action). On the other hand, when the motor stop signal is received, the welding controller 170 may control the automatic welding device (not shown) so that the automatic welding device (not shown) immediately stops the ongoing welding operation. For example, the welding control unit 170 may be connected to an arc generating unit (not shown) of the automatic welding device (not shown), and when the motor stop signal is received, the arc generating unit (not shown) may be deactivated to perform further welding work. This may not be performed.

By the above-described method, it is possible to prevent the damage caused by the in situ welding of the automatic welding device (not shown), and in particular, a malfunction due to the low-speed movement of the automatic welding device (not shown) (for example, the automatic welding device (not shown) ) Can solve the problem caused by the case that is incorrectly recognized that the welding is in place even though the welding is normally performed. In addition, the above-described method can reduce the damage to the common mode noise that can occur according to the welding environment.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It will be understood that the invention may be varied and varied without departing from the scope of the invention. In addition, it is assumed here that the motor motion detection apparatus 100 according to an embodiment of the present invention is provided in the automatic welding device (not shown), but this is to facilitate the description of the present invention. Do. Accordingly, the motor motion detection device 100 according to the present invention may be applied to an electronic device that is equipped with a motor and determines whether the motor is stopped by measuring a rotation speed of the provided motor. That is, the present invention is obviously applicable to all electronic devices equipped with a motor without being constrained by the automatic welding device 100.

1 is a schematic configuration diagram of a motor motion detection apparatus according to an embodiment of the present invention.

2 is a view of the operation of the line receiving unit according to an embodiment of the present invention.

3 is a diagram illustrating an operation when common mode noise occurs in the line receiving unit.

4 is a circuit diagram of a charge and discharge unit according to an embodiment of the present invention.

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

100: motor motion detection device

110: motor unit

120: noise removing unit

130: line receiving unit

140: charging and discharging unit

150: converter

160: comparison unit

170: welding control unit

Claims (5)

A motor unit, the motor unit detecting a rotation speed of the motor and generating and outputting a motor operation signal when power is supplied and activated; A charge / discharge unit configured to generate and output a charging signal corresponding to the motor operation signal when the motor operation signal is input; A conversion unit generating and outputting a conversion charging signal corresponding to the charging signal according to a preset method when the charging signal is input from the charging and discharging unit; And And a comparing unit comparing the charging signal with a preset threshold to determine whether the motor unit is operating. The method of claim 1, And a motor operation signal output from the motor unit is a single motor operation signal of a single ended type. The method of claim 2, And a line receiving unit which receives the single motor operation signal from the motor unit and converts the single motor operation signal into a differential motor operation signal of a differential type. The method of claim 1, And the converting unit calculates an effective value of the charging signal to generate the converted charging signal. The method of claim 3, When the single motor operation signal is input from the motor unit further includes a noise removing unit for removing the noise included in the single motor operation signal to output to the line receiving unit, The noise removing unit includes at least one of a zener diode or a varistor.

Images