KR20150132926A - Stop sequence of Inverter - Google Patents

Stop sequence of Inverter Download PDF

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Publication number
KR20150132926A
KR20150132926A KR1020140059499A KR20140059499A KR20150132926A KR 20150132926 A KR20150132926 A KR 20150132926A KR 1020140059499 A KR1020140059499 A KR 1020140059499A KR 20140059499 A KR20140059499 A KR 20140059499A KR 20150132926 A KR20150132926 A KR 20150132926A
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KR
South Korea
Prior art keywords
stop
frequency
inverter
auxiliary
motor
Prior art date
Application number
KR1020140059499A
Other languages
Korean (ko)
Inventor
배채봉
Original Assignee
엘에스산전 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
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Application filed by 엘에스산전 주식회사 filed Critical 엘에스산전 주식회사
Priority to KR1020140059499A priority Critical patent/KR20150132926A/en
Publication of KR20150132926A publication Critical patent/KR20150132926A/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
    • H02P23/20—Controlling the acceleration or deceleration
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
    • H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P3/00—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters
    • H02P3/02—Details
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P5/00—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors
    • H02P5/74—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors controlling two or more ac dynamo-electric motors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
    • H02P25/18—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring with arrangements for switching the windings, e.g. with mechanical switches or relays

Abstract

The present invention relates to a stop sequence of an inverter for preventing a rapid pressure change of a pipe which occurs when an inverter is stopped, which comprises the following steps of: enabling the inverter to control output by a stop frequency to control deacceleration of a main motor; and enabling the inverter to control output by an acceleration frequency higher than the stop frequency to control acceleration of the main motor if one of N sub motors is stopped.

Description

Stop sequence of Inverter}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a stopping sequence of an inverter that can prevent a sudden change in pressure of a duct caused when an inverter is stopped.

Generally, an inverter for driving a motor is used as a DC power source by rectifying and smoothing an AC having a fixed frequency, converting the same into a variable frequency and a variable voltage by using a plurality of semiconductor switches and an inverter control device, .

In a system for controlling a plurality of motors by an inverter, the inverter receives the pressure of a pipe and performs PID control on the basis of the feedback to control the operation speed of the continuously operated motor, which is directly connected to the inverter. And performs relay control for a plurality of auxiliary motors.

PID control is a feedback control that generates a control signal so that the output of the system maintains the reference voltage based on the error between the current signal and the reference signal. It is used to control temperature, pressure, flow rate, Proportional control, proportional integral control and proportional differential control are combined to improve control problems.

If the inverter controls the speed of the main motor while controlling the PID of the pipeline by controlling the pressure of the pipeline, if a stop command is generated in the inverter, the plurality of auxiliary motors stops instantaneously or stops at a predetermined time interval. Is given.

Therefore, the stopping sequence of the inverter is required to prevent the pressure of the pipeline from decreasing even in the event of a stop command being issued to the inverter.

The prior art for this stop sequence control is not found and the registered patent No. 1224161 is different from the inverter control for the motor restarting operation and the inverter system configuration and sequence of the present invention.

An object of the present invention is to provide an inverter system for controlling a plurality of motors with a single inverter, which is capable of preventing sudden pressure change of a duct caused by simultaneous turning off of multiple motors when the inverter is stopped.

According to the present invention, there is provided a motor control apparatus comprising: a main electric motor positioned in a duct and frequency-controlled; N (N > = 1) auxiliary motors located in the channel and controlled on / off; An inverter for receiving feedback of the pressure in the duct, frequency-controlling the main motor connected thereto, and controlling the auxiliary motor on / off; A first step of controlling the deceleration of the main motor by controlling the output of the inverter at a stop frequency when a stop command is generated; And a second step of performing acceleration control of the main electric motor by controlling output at an acceleration frequency higher than the stop frequency when the auxiliary electric motor is stopped. Thereafter, the main electric motor is controlled to be decelerated A third step ; And when the auxiliary motor is stopped, a fourth step of the acceleration control of the main motor and reducing the output of the acceleration frequency control than large acceleration frequency of the previous than a stop frequency output from the first stage; the N secondary electric motor for a to both stop And a stop sequence to be repeated N times.

The inverter is capable of controlling the output of the stop frequency and the acceleration frequency by receiving the pressure of the duct.

Also, the N auxiliary motors may be turned on / off by a relay control method, and may be sequentially stopped and controlled according to the stop frequency generation time point.

According to the present invention, even when the inverter is stopped, sudden pressure change of the conduit can be prevented through frequency control of the main motor, thereby reducing mechanical stress, contributing to prolonging the life of the product and improving reliability.

1 is a configuration diagram of an inverter system applied to the present invention.
2 is a configuration diagram of another inverter system applied to the present invention.
3 is a frequency control graph generated in the system of FIG.
4 is a frequency control graph generated in the system of FIG.
5 is a frequency control graph to which the stop sequence of the present invention is applied for the system of FIG.
Figure 6 is a frequency control graph to which the stop sequence of the present invention is applied for the system of Figure 2;
7 is a flowchart showing the stop sequence of the inverter according to the present invention.
8 is a block diagram of an inverter control system providing a stop sequence in accordance with the present invention and in which the main motor is operated separately.
9 is a block diagram of an inverter control system providing a stop sequence in accordance with the present invention and in which the main motor is selected from auxiliary motors.

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

1 is a block diagram of an inverter system applied to the present invention. The inverter 10 includes a main electric motor 20, a duct 30, an auxiliary electric motor control unit 40, a relay 50, and an auxiliary electric motor 60 .

The inverter system of the present invention is configured such that N auxiliary motors 60 including the main electric motor 20 are operated in a single duct 30 and the pressure generated in the duct 30 is fed back by the inverter 10, Control is performed. Here, N is an integer larger than 1, which means that there is at least one auxiliary motor.

The inverter system of the present invention can be applied to the mechanical control of a pump that transports fluid through a tube using pressure action.

The auxiliary motor control unit 40 controls the relay 50 contact of the auxiliary electric motor 60 to be operated through the priority select sequence in accordance with the operation start instruction of the inverter 10. [

Since the relay 50 and the auxiliary motor 60 are provided with N pieces, the auxiliary motor control unit 40 controls which of the auxiliary motors is to be operated and stopped.

Fig. 2 shows another inverter system applied to the present invention. The inverter system includes an inverter 10a, a duct 30a, an auxiliary motor control unit 40a, a relay unit 50a, and an auxiliary electric motor 60a. The difference is that the main electric motor is arbitrarily selected among the auxiliary electric motors 60a.

The inverter selects one of the N auxiliary motors 60a to function as the main motor. Since the inverter system having such a structure can compensate the mechanical stress of the main motor by the auxiliary motor, the overall life of the product It is possible to flexibly cope with an emergency situation such as a failure.

3 is a graphical representation of the operation of the motors by the inverter system of FIG.

3 is a graph showing the feedback of the pressure of the conduit 30 input to the inverter 10. When the feedback is less than the reference value about the reference point of the feedback, (Start freq 1 to 5), and when the feedback is less than the reference value, the auxiliary motor is sequentially operated and deceleration control of the main motor 20 is started.

FIG. 3 is a simplified version of the motor control process of the inverter system for explaining the technical features of the present invention, and the technical scope of the present invention is not limited to the specific range expressed in the graph (eg range and interval of time (t) start freq, range of stop freq, number of auxiliary motors, etc.).

A process of controlling the motor of the inverter system of FIG. 1 will be described in detail with reference to FIG.

When a start command is generated in response to the feedback of the pressure in the duct 30 (eg PID control), the inverter 10 controls the output to be the acceleration frequency (Start freq 1) So that the feedback rises up to time t1.

The N auxiliary motors 60 are arranged such that the auxiliary motors to be operated by the contact control of the auxiliary motor control unit 40 to the relays 50 are determined. However, for the sake of convenience of explanation, (Auxiliary motor 1 -> auxiliary motor 5).

The auxiliary motor 60 performs an operation or stop operation by relay on / off control, and raises the pressure of the duct 30 during operation.

When the output rises to the output-controlled acceleration frequency (start freq 1) at time t1 and the feedback does not reach the reference value, the auxiliary motor 1 is actuated.

When the auxiliary electric motor 1 is operated, the pressure of the duct 30 rises and the inverter 10 controls the output to be the stop frequency (stop freq 1) to the main electric motor 20 to control the deceleration to provide a gentle rise in pressure do.

Since the feedback does not reach the reference value, the inverter controls the output at the acceleration frequency (start freq 2) to accelerate the main motor 20 and increase the pressure in the duct 30.

Since the feedback does not reach the reference value at the time t2 when the acceleration frequency (start freq 2) is reached, the inverter 20 further operates the auxiliary electric motor 2 to increase the pressure of the duct 30.

At this time, when the feedback increases, the inverter 10 controls the output to the stop frequency (stop freq 2) to decelerate the main motor 20.

When the pressure of the conduit 30 is adjusted, the inverter 10 controls the output at the acceleration frequency (start freq 3) to increase the pressure of the conduit 30, and at a time t 3 at which the set acceleration frequency (start freq 3) Since the feedback is still below the reference value, the auxiliary motor 3 is operated additionally.

When the auxiliary motor 3 starts to operate and the pressure of the duct 30 increases, the inverter 10 controls the output of the duct 30 by controlling the output to the stop frequency (stop freq 3) again.

In this way, the inverter 10 controls the corresponding output to the main electric motor 20 at the acceleration frequencies (Start freq 1 to 5) and the stop frequency (Stop freq 1 to 5) and controls ON / OFF of the N auxiliary motors, The control of the pressure of the conduit 30 is repeated.

The N auxiliary motors 60 are operated when the feedback is less than the reference value at the time of reaching the acceleration frequency set by the inverter, and when the auxiliary motor is operated, the inverter outputs the set stop frequency to control deceleration of the main motor, Maintain pressure.

The process of sequentially operating the N auxiliary motors 60 in the order selected by the auxiliary motor control unit 40 is repeated N times.

When the feedback reaches the reference value beyond the time t4, the output is controlled to the stop frequency (stop freq 4) without further auxiliary operation of the auxiliary motor so that only the main motor 20 is decelerated to the stop frequency (stop freq 4).

As a result, when the feedback is less than the reference value, the output is controlled to the acceleration frequency (start freq 5) again to increase the feedback, and the auxiliary motor 5 is additionally operated because the feedback does not reach the reference value at time t5.

Conversely, when a stop command is generated in the inverter 10, all the motors must be stopped and controlled. The N auxiliary motors are sequentially stopped and controlled in accordance with a set time interval.

Assuming that a stop command has occurred at t8 in FIG. 3, a stop command is generated at a time in all auxiliary motors 60 including the main motor 20. At this time, When changing from t8 to t13, the motors are sequentially stopped.

At this time, the pressure of the conduit (30) is inevitably reduced and the mechanical stress is generated and the life of the machine is shortened.

FIG. 4 is a graph showing changes in frequency output and feedback with respect to time as in FIG. 3, which is a motor control graph of the inverter system of FIG.

FIG. 4 shows that the auxiliary motor 1 is selected as the main motor, so that the start command is generated after the auxiliary motor 1 starts to operate.

(Start freq 2 to start freq 4) with respect to the main motor (auxiliary motor 1) while the time changes from t1 to t8. If the feedback does not reach the reference value even after reaching the set acceleration frequency, the auxiliary motor 2 To 5 are sequentially controlled to increase the pressure of the channel and to control the stop frequency (stop freq 1 to 5) of the inverter 10 to prevent sudden change of the channel pressure.

When a stop command is generated, the auxiliary motors are sequentially stopped from t8 to t13 according to the time interval set in the inverter, similar to Fig.

5 is a graph further including a process of frequency-controlling the main electric motor to make a gentle change in the pressure of the duct when a stop command occurs in the inverter system in which the main electric motor is designated as shown in FIG. 1 .

Assuming that a stop command has occurred at time t8, the inverter 10 controls the deceleration control of the main motor by controlling the stop frequency (stop freq 5), and when the stop frequency reaches the set stop frequency (stop freq 5), the auxiliary motor The auxiliary motor 5 started to operate at the latest is stopped and controlled.

When the auxiliary motor 5 is stopped and the pressure in the duct is reduced rapidly, the inverter 10 again controls the main motor 20 by controlling the output of the acceleration frequency (start freq 4).

It is important that the inverter 10 controls the frequency output by receiving the pressure of the conduit 30 even when the stop command is generated. It is important to control so that the feedback can be gradually reduced at the stop command.

When the set acceleration frequency (start freq 4) is reached, the inverter 10 again controls the stop frequency freq 4 to decelerate the main motor 20.

When the stop frequency reaches the stop frequency (stop freq 4), the auxiliary motor 4 is stopped and the pressure in the duct is reduced rapidly. At this point, the inverter 10 controls the main motor 20 Acceleration control can be used to gradually reduce the pressure in the pipeline.

In this manner, the inverter 10 continuously performs the deceleration control and the acceleration control for the main motor 20 until the N auxiliary motors are sequentially stopped at time t8 and the stop command for the inverter is completed The process of gently reducing the pressure of the pipeline is repeated N times.

Although FIG. 5 shows that the auxiliary motors are operated and stopped in the order of the serial numbers assigned to the auxiliary motors, in practice, any one of the auxiliary motors can be selected by various parameters, and the order thereof is not definite. It will be obvious that the same is applied in FIG.

FIG. 6 is a graph further illustrating a process in which a stop command is smoothly performed by frequency control in the inverter system shown in FIG. 2. FIG. 5 differs from FIG. 5 only in the portion in which the auxiliary motor 1 operates as the main motor.

Therefore, the auxiliary electric motor 1 is frequency-controlled by the inverter 10a until all the other auxiliary electric motors are sequentially stopped, and the pressure of the duct 30a is gently maintained.

The present invention is characterized in that a stop sequence of an inverter for controlling a connected motor through frequency output control and relay control is characterized in that a pressure value generated by the operation of the motor in a duct to which the motor belongs is fed back to the main motor The speed of the main motor is controlled by the frequency control method.

The start freq output control is to increase the pressure of the duct by accelerating the main motor to the set acceleration frequency and the stop freq output control is to decrease the pressure of the duct by decelerating the main motor to the set stop frequency Control.

In order to control the feedback to maintain the reference value, the inverter attempts to regulate the pressure of the pipeline by sequentially operating the auxiliary motors for the deficient portion by controlling only the main motor.

However, in the stop sequence of the inverter of Figs. 3 and 4, all the motors are stopped at a specified time interval and the control of the pressure of the duct is insufficient. Therefore, the present invention is characterized in that the stop frequency stop freq 5 to stop freq 1 in order.

At the time when the main motor reaches each of the set stop frequencies, the auxiliary motor is also sequentially stopped. At this time, the main motor is accelerated and controlled in the order of the set acceleration frequencies start freq 5 to start freq 1, It is an important technical feature to control the feedback to be shown.

Through the above-described stop sequence, it is possible to mitigate the situation where the conduit pressure is reduced rapidly when the stop command is generated, thereby preventing the mechanical stress.

FIG. 7 is a flowchart showing the stopping sequence of the inverter according to the present invention.

When a stop command of the inverter occurs, the inverter performs deceleration control by controlling output to the main motor at the stop frequency (s100).

The stop frequency immediately after the stop command is generated will be set to a value smaller than the acceleration frequency before the stop command is generated, which is sufficient to be understood as a stop freq 5 smaller than the start freq 5 in FIG. 5 or 6.

Such a frequency setting is based on feedback control (e.g. PID control).

In the deceleration control process, it is determined whether one of the N auxiliary motors is stopped (s200).

If the auxiliary motor is stopped, the main motor is output-controlled at the acceleration frequency to perform acceleration control for the main motor (s300). If the auxiliary motor is not stopped, the deceleration control for the main motor is continued (S400).

At this time, the acceleration frequency in step s300 will be larger than the stop frequency set in step s100.

After the main motor is accelerated to prevent the pressure of the duct from dropping due to the stop of the auxiliary motor, it is determined whether there is an auxiliary motor in operation (S500).

If there is an auxiliary motor in operation, the main motor is decelerated (S600). If there is no auxiliary motor in operation, deceleration control is performed until the main motor is completely stopped, and the stop command of the inverter is completed (S700).

The stop sequence in Fig. 7 relates to the frequency control of the main motor and the stopping sequence of the inverter controlling N (N > = 1) auxiliary motors.

The stop frequency and the acceleration frequency are applied in a decreasing magnitude relative to the immediately preceding stop frequency and the acceleration frequency, respectively, so that the frequency is continuously decreased and the operation of the motor is stopped.

A first step of controlling the deceleration control of the main electric motor by controlling the output of the inverter at a stop frequency that is less than the previously controlled frequency when a stop command is generated; And a second step of controlling acceleration of the main electric motor by output control at an acceleration frequency higher than the stop frequency when any of the auxiliary electric motors is stopped.

A third step of controlling the deceleration of the main motor by controlling output of the stop frequency smaller than the immediately preceding stop frequency from the second time; And a fourth step of controlling acceleration of the main electric motor by controlling the acceleration frequency to be larger than the stop frequency outputted in the third step and smaller than the immediately preceding acceleration frequency when one of the auxiliary electric motors is stopped, Repeat N times until all stops.

A third step in which the inverter outputs a stop frequency less than the immediately preceding stop frequency to decelerate the main motor; and when any of the N auxiliary motors is stopped, And a fourth step of accelerating and decelerating the main motor by controlling the output of the acceleration frequency to be smaller than the frequency, wherein the third and fourth steps are repeatedly performed as one set of control processes , The control process is repeated N times until all of the N auxiliary motors are stopped.

Assuming that the auxiliary electric motor is five as shown in the figure, the above sequence is repeated five times and the stop sequence is performed. After five times, the main electric motor is stopped by the final stop frequency.

The inverter stop sequence of the present invention allows the inverter to sense the feedback pressure value of the duct to control the stop frequency and the acceleration frequency output to the main motor.

Although the auxiliary motor is limited to five, the acceleration frequency and the stop frequency are limited to five, and the time t and the feedback graph are arbitrarily set and described in the description of the technical features of the present invention, It is clear that the embodiment should be modified in accordance with various field situations.

The technical features of the present invention are not limited to the above-described limiting values, but are in a frequency control scheme for gently reducing the pressure of the channel in the stop sequence. Therefore, the scope of the present invention should not be construed to be unduly limited do.

Further, the present invention proposes a stop sequence of an inverter in a stop command, and an inverter and an applicable product thereof can be included in the technical scope of the present invention.

FIG. 8 is a block diagram showing a configuration of an inverter control system to which a stop sequence according to the present invention is applied. The inverter system of FIG. 1 or FIG. 2 represents a system to which the stop sequence of FIG. 7 is applied, The sequence control unit 101 is included to indicate that the stop sequence according to the present invention is performed when a stop command is generated in the frequency control process of the inverter.

The inverter 10 receives the pressure from the duct 30 in a manner such as PID control to frequency-control the main electric motor 20. When the stop command is generated, the stop sequence controller 101 controls the main motor control Is performed.

When performing the stop sequence, the auxiliary motor control unit 40 includes a sequence of contact-controlling the relay 50 according to an instruction of the inverter, and controls which auxiliary motor of the N auxiliary motors 60 stops when.

8, the main electric motor 20 is separately shown. However, when one of the auxiliary electric motors is arbitrarily selected and controlled as the main electric motor as in the system of FIG. 2, it is configured as shown in FIG. 9, and the inverter 10a, A control unit 101a, a duct 30a, an auxiliary motor control unit 40a, a relay 50a and an auxiliary electric motor 60a.

Details of each configuration are the same as those described in the system description of FIG. 2, and redundant description is omitted.

10, 10a: Inverter 20: Main motor
30, 30a: conduit 40, 40a: auxiliary motor control section
50, 50a: relays 60, 60a: auxiliary motor
101, 101a: Stop sequence control section

Claims (5)

In the stop sequence of the inverter controlling the main electric motor located in the duct and N (N > = 1) auxiliary electric motors,
A first step of controlling the main motor to decelerate by controlling output to a stop frequency when a stop command is generated ;
A second step of controlling acceleration of the main electric motor by output control at an acceleration frequency higher than the stop frequency when the auxiliary electric motor is stopped;
A third step of controlling the deceleration of the main motor by controlling output of the stop frequency smaller than the immediately preceding stop frequency; And
If the auxiliary motor is stopped, a fourth step of the acceleration control of the main motor to output a smaller acceleration than the frequency control the frequency immediately before the large acceleration than a stop frequency output in step 1; including,
After the first and second steps are performed, the third and fourth steps are repeated N times until all of the N auxiliary motors stop. The method according to claim 1,
Wherein the inverter controls the stop frequency and the acceleration frequency output by feeding back the pressure of the duct. The method according to claim 1,
Wherein the N auxiliary motors are turned on / off in a relay control manner. The method according to claim 1,
Wherein the N auxiliary motors are sequentially stopped-controlled in accordance with the time point at which the stop frequency is reached. The method according to claim 1,
Wherein said main motor is selected from among N auxiliary motors.


KR1020140059499A 2014-05-19 2014-05-19 Stop sequence of Inverter KR20150132926A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180097213A (en) * 2017-02-23 2018-08-31 엘에스산전 주식회사 Apparatus for controlling inverter in forming machine system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180097213A (en) * 2017-02-23 2018-08-31 엘에스산전 주식회사 Apparatus for controlling inverter in forming machine system

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