JPH09124202A - Roll material feeding device control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the structure of a rolled material supply device which unwinds the rolled material wound with a band material into a shape of a cylinder and supplies the unwound band material to the next process. SOLUTION: A first motor M1 which drives pinch rollers PR1, PR2 sandwiching a band material BM to send it out is controlled through a first inverter IV1 by a main controller MCA to rotate at a predetermined constant speed. The torque of a second motor M2 which corresponds to torque generated by the motor M1 and applies tension to the band material BM unwound from a rolled material RM through a second transmission G2 and a rolled material drive shaft RDS so that the current flowing into the first motor M1 which is the current corresponding to the tension of the band material BM reaches a current IF as target value, is controlled by the main controller MCA through a second inverter IV2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to control of a roll material feeding device which is a device for feeding a roll material, which is a material obtained by winding a silicon steel strip, a copper strip or the like in a tubular shape, to a machine in the next process while rewinding. Regarding the method.

[0002]

2. Description of the Related Art FIG. 4 shows a structure of a roll material feeding device A as an example of a conventional roll material feeding device. The roll material feeding device A includes a main device AM and a control unit AD.
The main unit AM receives the winding axis of the roll material RM and rotates the roll material around the axis, which is a roll material drive shaft RDS, and a strip-shaped material BM rewound from the roll material RM (band material BM in the following description. The rollers GR1 and GR2 for guiding the strips) and the pinch rollers PR1 and PR2, which are rollers for sandwiching the strip BM between the two rollers and pulling in the feeding direction, are located between the rollers GR1 and GR2, A dancer roller DR, which is a roller that applies tension to the material BM, a sensor S1 that detects the upper limit position UL of the dancer roller DR, and a sensor S2 that detects the lower limit position LL of the dancer roller DR. The control unit AD includes a first motor M1, a first speed reducer G1 that reduces the rotational speed of the first motor M1 and transmits power to the pinch roller PR1, a first inverter IV1 that controls the rotational speed of the first motor M1, Second motor M2, second motor M2
Second speed reducer G2 for decelerating the rotational speed of the motor and transmitting the power to the roll material drive shaft RDS, a second inverter IV2 for controlling the rotational speed of the second motor M2, a first inverter and a second inverter for controlling the rotational speed of the second motor M2. It consists of a main controller MC that controls the first motor and the second motor.

Both the first speed reducer G1 and the second speed reducer G2 are
The speed reducer includes a combination of spur gears, for example, which transmits torque as a reaction of torque in the direction of transmitting power from the power source to the power source side. First motor M
The first and second motors M2 are both induction motors, and generate torque by the interaction between the rotating magnetic field created by the three-phase currents flowing through the windings of the stator and the rotor current induced by the rotating magnetic field. First inverter IV
1 and the second inverter IV2 are respectively the first motor M1 and the second motor IV.
The torque and the rotation speed are controlled by controlling the frequency of the rotating magnetic field of the motor M2.

Next, the control of sending the roll material RM by the main controller MC will be described with reference to the drawings. The main controller MC is
A target rotational speed of the first motor M1 is given to the first inverter IV1. The first inverter IV1 outputs three-phase electric power that creates a rotating magnetic field of the first motor M1 so that the target rotating speed is given by the main controller MC, and the rotor of the first motor M1 is rotated by this rotating magnetic field. The pinch roller PR1 is rotated via the first reduction gear G1, and the strip material BM rewound from the roll material RM is delivered at a predetermined delivery speed determined by the rotation speed of the pinch roller. Pinch roller PR2 is pinch roller PR
The strip material BM to be sent is sandwiched between the pinch roller and the pinch roller by the torque given from the first motor M1 by a mechanism (not shown).
It is a roller that rotates in the opposite direction to PR1. The dancer roller DR is a roller that freely rotates about its own cylindrical axis as a rotation axis, and as shown in the figure, applies tension to the strip BM by its own weight. If the speed at which the roll material RM is rewound, that is, the peripheral speed of the roll material RM is smaller than the delivery speed of the strip material BM at the pinch roller PR1 portion, the dancer roller DR determines the delivery speed of the strip material RM and the roll material RM. It is gradually pulled up at a speed which is half the difference in the peripheral speed of, and reaches the position of the sensor S1. When the dancer roller DR reaches the position of the sensor S1, the sensor S1 sends to the main controller MC a signal indicating that the dancer roller DR has reached the upper limit position UL. Upon receiving this signal, main controller MC speeds up second motor M2 via inverter IV2. As a result of the increased speed, when the speed at which the roll material RM is rewound exceeds the speed at which the unwound strip material BM is delivered, the dancer roller DR moves downward at half the speed of both speeds.
The radius of the roll material RM decreases as the rewinding progresses, and the peripheral speed decreases, so that the dancer roller DR stops moving downward and moves upward again. If the speed at which the roll material RM is rewound further exceeds the speed at which the strip material BM is delivered, the dancer roller DR has reached the lower limit position LL, and the sensor S2 has reached the lower limit position LL for the dancer roller DR. To the main controller MC. The main controller MC that receives this signal decelerates the second motor M2 via the second inverter IV2. By the control of the main controller MC described above, the strip material BM is rewound from the roll material RM and supplied,
The tension is kept almost constant by the dancer roller DR, and it is delivered to the machine of the next process at a constant speed without causing slack. In addition, since the force in the direction of returning from the machine of the next process does not act on the strip material BM, the pinch rollers PR1, PR
The load applied to the first motor M1 via 2 is a load having a value determined by the product of the tension of the strip BM and the delivery speed.

FIG. 5 is a graph showing the relationship between the slip S of the first motor M1 and the torque TQ. However, slip S
Is the ratio of the value obtained by subtracting the rotational speed of the rotor from the synchronous speed that is the rotational speed of the rotating magnetic field to the synchronous speed,
It represents the degree of deviation of the rotational speed of the rotor from the synchronous speed. As shown in the figure, the first motor M1 exhibits the same (slip) -to- (torque) characteristics as a general induction motor. If the rotor rotation speed is slower than the synchronous speed, a positive torque is generated and the rotor is rotated at the synchronous speed. If the rotation speed of is fast, a negative torque is generated. The magnitude of the torque is substantially proportional to the magnitude of the slip S in the range close to the synchronous speed. Second
Since the motor M2 is also an induction motor having the same characteristics as the first motor M1, the characteristics of the second motor M2 will be described as being the same characteristics as the first motor M1. For example, the first motor M1
When the first motor M1 is operating in the slip S1 and the second motor M2 is operating in the slip S2, the first motor M1 generates the positive torque TF and the second motor M2 generates the negative torque TB. Second
The torque TB generated by the motor M2 appears as a reaction torque TBR through the strip material BM in the first motor M1, and the difference between the torque TF and the torque TBF rewinds the roll material RM, or the strip material BM. Torque that compensates for the loss that occurs when the vehicle runs. Torque TB and torque TBR as this reaction
Equal to, and a tension corresponding to the torque TBR is applied to the strip BM. Further, the tension corresponding to the torque TBR is also a tension as a reaction of the tension by the dancer roller DR, which is equal to the tension applied to the strip BM by the dancer roller DR. The magnitude of the tension applied to the strip BM described above is shown in Equation 1, and the force for rewinding the roll material RM and running the unwound strip BM is shown in Equation 2.

[0006]

[Equation 1] Tension = (k1) * (torque TB) where K1 is a constant determined by the mechanical system and * is a multiplication symbol

[0007]

[Equation 2] Force required to run the strip BM = (K2) *
((Torque TF)-(Torque TBR)) However, K2 is a constant determined by the mechanical system, * is a multiplication symbol. FIG. 6 is a block diagram showing the inside of the master control device MC. As shown in the figure, the main control device MC includes a control calculation means 1, a program storage means 2 for storing a program executed by the control calculation means 1 to realize the function of the roll material feeding device A shown in FIG. A data storage unit 3 for storing data to be referred to when it is executed or data generated by the control calculation unit 1, an input device 4 which is a device for inputting an external signal such as an operation input, a display device 5,
Outputs a control signal to the input unit 6, which is a circuit for inputting a signal from the main device AM (see FIG. 4) to be controlled, the main device AM, etc., or outputs data related to the roll material feeding device A to the outside. The output section 7 is a circuit for The program storage means 2 receives the signal input from the input device 4, the display device 5 displays the data stored inside the main controller MC, the process receives the signal from the input unit 6, Basic program P1 that realizes the basic functions of the main controller MC, such as the process of outputting data from the output unit 7.
And a control for realizing the function of the roll material feeding device A, for example, a control for performing the first motor M1 via the first inverter IV1.
An application program P2 for controlling the second motor M2 via the second inverter IV2 in response to signals from the sensors S1, S2, etc. is stored.

[0008]

As described above, in the conventional roll material feeding device, proper tension is applied to the fed strip material to eliminate slack, and the strip material is delivered at a predetermined speed without delay. There was a dancer roller and a play area for the band of the dancer roller. However, in order to provide the dancer roller, a guide roller for guiding the strip material to the dancer roller is required, and when setting the leading end portion of the strip material rewound on the roll material feeding device first, It was necessary to perform a non-trivial operation to pass the tip of the strip fed from the material through a guide roller or dancer roller.

In view of the above circumstances, the present invention provides
A method of controlling a roll material feeding device, which does not require a dancer roller and a guide roller required for guiding the band material to the dancer roller, and makes it easy to set the roll material in the roll material feeding device. The purpose is to provide.

[0010]

In order to achieve the above-mentioned object, according to the present invention, a main unit and a control unit are provided, and the main unit receives a winding shaft of a roll material obtained by winding a strip material in a cylindrical shape. And a pinch roller that sandwiches the strip material rewound from the roll material and sends out the strip material. The control unit drives the pinch roller. A motor, a first controller that controls the rotation speed of the motor, a second motor that drives the drive shaft, a second controller that controls the motor, and a first controller via the first and second controllers. In the control method of the roll material feeding device, which comprises a main control device for controlling the second motor,
The rotational speed of the first motor is controlled so as to be maintained within the predetermined range of the rotational speed output from the main controller to the first controller,
Adjusting the torque of the second motor via the second control device so that the electric power supplied to the first motor is in a predetermined range corresponding to the electric power that applies tension to the strip in a predetermined range. Is used to control the tension applied to the strip.

Therefore, in the method of the present invention, the pinch roller is controlled by the first control device so that the first motor has a predetermined rotation speed, so that the strip material has a constant speed determined by the rotation speed of the first motor. Delivered at speed. Also, the first
The electric power supplied to the motor is equal to the value obtained by multiplying the speed at which the strip is delivered by the tension applied to the strip, and since the delivery speed is controlled to be constant, the magnitude of the electric power is the magnitude of the tension. The value is proportional to. . Therefore, the control target electric power range is set to the electric power range required to apply a predetermined tension to the strip, and the electric power supplied to the first motor is controlled to fall within the predetermined range. A predetermined tension is applied to the strip material. If the power supplied to the first motor is below the target range, the torque of the second motor in the opposite direction to the feeding direction of the strip is controlled to increase, and the tension applied to the strip increases. Then, when the electric power increases toward the target range and the electric power supplied to the first motor exceeds the target range, the torque of the second motor in the direction opposite to the feeding direction of the strip is controlled to decrease. The tension applied to the strip is reduced so that the electric power is reduced toward the target range. As a result, the strip is delivered at a constant speed while a predetermined tension is applied to the strip.

Further, in the present invention, the first motor and the second motor are three-phase induction motors, the first control device is a first inverter, the second control device is a second inverter, and The first inverter and the second inverter respectively keep the voltage of a power source for supplying power to the first motor and the second motor constant, and generate a rotating magnetic field generated inside the first motor and the second motor by the power source. A device that controls the rotation speed or torque of each of the first motor and the second motor by controlling the rotation speed.
The inverter controls the rotation speed of the first motor so that the rotation speed is within a predetermined range input from the main control device, and the main control device controls the first motor according to the magnitude of the current input to the first motor. The power supplied to the first motor is detected so that the current supplied to the first motor falls within a predetermined range.
The tension applied to the strip is controlled by adjusting the torque of the motor via the second inverter. That is, the main controller detects the difference between the target power range and the current power as the difference between the target current value range and the current current value,
The torque of the second motor is controlled so that this difference in current value is eliminated.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION A method for controlling a roll material feeding device according to the present invention controls a first motor for driving a pinch roller to feed a strip material unwound from the roll material at a predetermined constant speed, By controlling the torque of the motor that drives the material drive shaft, the tension applied to the material is adjusted so that the electric power supplied to the motor that drives the pinch roller that supplies the material is within a predetermined range. By so setting, the tension applied to the strip is controlled to a predetermined value. The method of the present invention will be described in detail below with reference to the drawings showing an example of an embodiment.

FIG. 1 shows a roll material feeding device AA to which the method of the present invention is applied, which is an example showing an embodiment of the present invention. As shown in the figure, the roll material feeding device AA comprises a main device AMA and a control unit ADA. The main unit AMA consists of roll material drive shaft RDS, pinch rollers RP1 and RP2, and control unit ADA.
Controls the rotational speeds of the first motor M1 and the first motor M1 to reduce the rotational speed of the first motor M1 and to transmit the power from the first motor M1 to the pinch rollers PR1 and PR2. The first inverter IV1 and the second motor M, which are the first control device
2. A second control unit that controls the torque of the second motor M2, which reduces the rotational speed of the second motor M2 and transmits the power of the second motor M2 to the roll material drive shaft RDS. Via the second inverter IV2, the first inverter IV1 and the second inverter IV2, the first motor M1 and the second motor M1, respectively.
Of the elements constituting the roll material feeding device AA, which is composed of a main controller MCA for controlling M2, the same reference numerals as those of the elements constituting the roll material feeding device A shown in FIG. Since the components have the same functions as the constituent elements of the roll material feeding device A, description thereof will be omitted. In the figure, CT is a current transformer that detects the current value of the circuit of the power supplied from the first inverter IV1 to the first motor M1, and the power circuit that is supplied to the first motor M1 via the current transformer CT. The current value of is input to the main controller MCA.

FIG. 2 is an explanatory view of the operation of the roll material feeding device AA shown in FIG. 2A shows a predetermined constant rotation speed RS0 of the rotor of the first motor M1 shown in FIG. 1 when the strip BM (see FIG. 1) is delivered at a predetermined constant speed.
The slip SA indicating the degree of deviation of the rotational speed of the rotating magnetic field generated inside the first motor by the three-phase power supplied from the inverter IV1 and the torque TC generated in the rotor of the first motor M1. It is the figure which showed the relationship. FIG.
Since the relationship between the slip and torque of the second motor M2 shown in (1) is the same as that of the first motor M1, the description of the part relating to the second motor M2 will be described with reference to FIG. In addition, in FIG. 2A, the rotational speed of the rotating magnetic field is used as a reference instead of the rotational speed of the rotor, but the relationship between the slip S and the torque TC shown in FIG. 5 is shown. Is essentially the same figure. The stator of the first motor M1 generates a rotating magnetic field having a rotation speed faster than the rotation speed of the rotor by the three-phase electric power from the first inverter IV1 and generates a positive torque TF in the slip S1 to generate the first torque M1.
Of the second inverter IV by rotating the rotor of
Second motor M2 (Fig. 1
The rotating magnetic field of (2) rotates at a slower speed than the rotor of the second motor M2, and the second motor M2 generates a negative torque TB in the slip S2. The rotation speed of the second motor M2 in this case is a rotation speed determined by the peripheral speed of the roll material RM (see FIG. 1), and the peripheral speed of the roll material RM is equal to the delivery speed of the strip material BM. By the operation of the roll material feeding device AA described above, the tension shown in Formula 1 acts on the strip material BM.

2B shows the relationship between the current value IF of the electric power supplied to the first motor M1 and the torque TC generated in the rotor of the first motor M1 on the right side of the vertical axis. Second motor M2 on the left
FIG. 6 is a diagram showing a relationship between a current value IB of electric power supplied to the motor and a torque TCB generated in the rotor of the second motor M2. First
Since the rotation speed of the rotating magnetic field generated in the stator of the first motor M1 is higher than the rotation speed of the rotor of the motor M1, the electromagnetic action of the rotor current and the rotating magnetic field induced by this rotating magnetic field causes the rotation of the rotating magnetic field shown in FIG. As shown in (), a positive torque is generated according to the magnitude of the slip SA. In this case, the first
The voltage applied to the stator of the motor M1 is constant, and the power factor of the electric power supplied to the first motor M1 is almost constant while the slip is small. Therefore, the increase in power is almost equal to the increase in current. Proportional. On the other hand, since the torque and the tension applied to the strip are in a proportional relationship, the tension applied to the strip BM changes almost in proportion to the change in the current. As described above, the relationship between the tension on the strip BM and the current flowing into the first motor M1 is determined, and the current IF flowing into the first motor M1 is the current value IF.
When it becomes 0, a torque TF that causes the tension on the strip BM to a predetermined value is generated. Therefore, the current within a certain range around the current value IF0 is set as the target current range.

In the second motor M2, a rotating magnetic field slower than the rotation speed of the rotor of the second motor M2 is generated, and when the current IB flows, the negative torque TB is generated. In the figure
When the first motor M1 generates the torque TF, the TBR has a magnitude equal to and opposite to the torque TB generated by the second motor M2. Is the torque applied to. That is, the tension applied to the strip BM is determined by the tokule TB. Torque TF and torque
The difference in torque TBR as a reaction of TB is a torque corresponding to the loss generated when the roll material RM is rewound or the strip material BM is run.

The main controller MCA operates the first motor M1 via the first inverter IV1 so that the rotation speed of the first motor M1 becomes a predetermined constant rotation speed RS0 (see (a) in FIG. 2). The second motor is controlled through the second inverter IV2 under the condition that the rotation speed of the first motor M1 is the rotation speed RS0.
Adjust the slip of M2 to give a predetermined tension to the strip BM.
For example, when the torque FP is below the target range, the main controller MCA adjusts the speed of the rotating magnetic field of the second motor M2 via the second inverter IV2 so that the slip SA of the second motor M2 increases. When the torque in the negative direction is increased by increasing the torque and the torque FP exceeds the target range, the main control unit MCA uses the second inverter IV2 to reduce the slip SA of the second motor M2. 2 Decrease the speed of the rotating magnetic field of the motor M2, reduce the torque in the negative direction, and put the current FI in the target range.

The main control unit MCA is an application program P2 that replaces the application program P2 of the main control unit MC shown in FIG.
Since the apparatus has the same configuration as the main control unit MC except that A is stored in the program storage means 2 (see FIG. 6), the configuration of the main control unit MC shown in FIG. It is referred to, and the diagram showing the configuration of the main control unit MCA is omitted.

FIG. 3 is a flow chart showing the processing in the main controller MCA of the roll material feeding device AA, which is realized by the control calculation means 1 (see FIG. 6) executing the application program P2A. Roll material RM (Fig. 1
(Refer to Fig. 1) The strip BM with the tip part rewound (see Fig. 1)
The tip of the pinch roller PR1 and pinch roller PR2 (Fig. 1
When the start condition is satisfied and the start signal is input to the main control unit MCA via the input device 4 (see FIG. 6), the main control unit MCA processes the process F1.
The first motor M1 (see FIG. 1) is put into operation at a predetermined constant speed via the first inverter IV1 by the starting process. Processing of the strip BM by a machine at the next stage (not shown) is started in synchronism with the stage where the operation at a predetermined constant speed is started. The main control unit MCA inputs a signal indicating whether or not the operation should be ended in the process F2, and if it is not ended, the process proceeds to the process F3, the current value of the current of the first motor M1 is input, and the current input in the process F4 is input. It is determined whether or not the current value of the current value matches the current value of the predetermined range corresponding to the predetermined tension of the strip BM. If the current value of the current is within the predetermined range, the process proceeds to F2. The above process is repeated. If the current value of the current is not within the predetermined range, the process proceeds to step F5. If the current value of the current is less than the current value within the predetermined range, the process proceeds to step F6, and the torque of the second motor in the negative direction is decreased. Is increased by a predetermined value for one step. If the current value of the current exceeds the current value in the predetermined range, the process proceeds to step F7, and the negative torque of the second motor is reduced by a predetermined one-stage value. When the process F6 or the process F7 is completed, the process proceeds to a process F8, and waits for a time period until the transient phenomenon due to the torque change of the second motor M2 is stabilized. When the time of the process 8 has elapsed, the process proceeds to the process F2 and the above process is repeated. When the signal indicating the end of the operation is detected in the process F2, the process proceeds to the process F9 and the stop process is performed.
The amount of change in one step of torque in process F6 and process F7 is an amount determined in relation to the waiting time in process F8, and is a value in a range that does not cause a sudden change in the operation of main device AM, for example, a predetermined value. The amount of change in the torque that gives a 1% change in the tension is defined as the value for one step.

The starting process in the process F1 is a process from the stop state of the roll material feeding device AA (see FIG. 1) to the normal operation, and includes the following procedure. This will be described below with reference to FIG. When it is confirmed that the front end of the strip BM is sandwiched between the pinch rollers PR1 and PR2 and set at a predetermined position on the machine for the next process, the main controller MCA starts the start-up process and With the motor M1 stopped, first, a negative rotating magnetic field is generated in the second motor M2 via the second inverter IV2 to apply tension to the strip BM.
Then, the first motor M1 is started. First motor M1 at start
The current that flows into the coil is controlled to a current value that exceeds the steady-state current that is sufficient to overcome the tension applied to the strip BM by the second motor M2 in advance and accelerate the roll material RM. Accelerate according to the acceleration curve.
When the rotation speed of the pinch roller PR1 reaches a predetermined rotation speed, the second motor M2 is passed through the second inverter IV2 so that the current flowing into the first motor M1 has a predetermined current value.
Control the torque of.

The stopping process in the process F9 shown in FIG. 2 is performed by the procedure described below. This will be described below with reference to FIG. When the stop signal is input, the main control unit MCA proceeds to step F9, and first decelerates the first motor M1 via the first inverter IV1 in accordance with the deceleration characteristic given in advance. When the first motor M1 is decelerated, the acceleration of deceleration causes a positive force due to the inertia of the roll material RM,
The tension of the strip BM is reduced, but the tension is reduced by the first motor M1.
Is fed back to the main control unit MCA as a decrease in current flowing into the main control unit MCA, and the main control unit MCA works to increase the negative torque of the second motor M2. Therefore, even when the feeding of the strip BM is stopped, The tension on the strip BM is controlled so as to fall within a predetermined range.

When the pinch rollers PR1 and PR2 are suddenly stopped by a brake device (not shown), the main controller MCA
Depending on the torque control of the second motor M2 by
It may be difficult to make the rotation of RM follow the stop of pinch rollers PR1 and PR2.
The band BM between the position where RM is set and the position of the pinch rollers PR1 and PR2 is loosened.Therefore, by preparing a space to release the looseness, the obstacle that is expected to occur during an emergency stop is eliminated. can do. The slack in this case is removed by the subsequent negative torque of the second motor M2.

[0024]

As described above, according to the present invention, the main device and the control unit are provided, and the main device receives the power of the roll material winding shaft by receiving the winding shaft of the roll material in which the strip material is wound in a cylindrical shape. The drive shaft to transmit and the strip material rewound from the roll material are sandwiched,
It has a pinch roller for feeding this band material,
The control unit includes a first motor that drives the pinch roller, a first control device that controls the rotation speed of the motor, a second motor that drives the drive shaft, and a second control device that controls the motor. In the method for controlling the roll material feeding device, which comprises a main controller that controls the first and second motors via the second controller, the rotation speed of the first motor is
Control is performed so as to maintain the rotation speed within a predetermined range output from the main control device to the first control device, and the electric power supplied to the first motor corresponds to the electric power that gives tension to the band in a predetermined range. The tension applied to the strip is controlled by adjusting the torque of the second motor via the second control device so that the electric power is within the range.

That is, according to the method of the present invention, the first condition is to control the feeding speed of the strip material to a predetermined constant value, and the electric power required to apply the predetermined tension to the strip material is set to the target value. Then, the torque of the second motor M2 is controlled so that the electric power applied to the first motor falls within a predetermined range around this target value. Therefore, the main device, which is a mechanical part of the roll material feeding device, detects the position of the dancer roller for maintaining the tension applied to the band material, the guide roller accompanying the installation of the dancer roller, and the dancer roller. It is possible to adopt a configuration that does not require a sensor.

Further, in the present invention according to claim 2, the first motor and the second motor are three-phase induction motors, the first control device is the first inverter, and the second control device is the first. Two inverters, a first inverter and a second inverter
The inverter controls the rotational speeds of the rotating magnetic fields generated inside the first motor and the second motor by the power source while keeping the voltage of the power source supplying the first motor and the second motor constant. The first inverter is a device for controlling the rotation speed or torque of each of the first motor and the second motor, and the first inverter rotates the rotation speed of the first motor so that the rotation speed is within a predetermined range input from the main control device. The main controller detects the power supplied to the first motor according to the magnitude of the current input to the first motor, and the current supplied to the first motor falls within a predetermined range. Further, the tension applied to the strip is controlled by adjusting the torque of the second motor via the second inverter.

That is, according to the method of the present invention, the first and second motors use a robust three-phase induction motor having a simple structure.
The second control device is applied to a roll material feeding device using the first and second inverters, which enables smooth and sufficient control economically by semiconductor technology. Therefore, by applying the method of the present invention, it is possible to obtain a roll material feeding device that does not require an economical and highly reliable dancer roller and equipment associated with the roller.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a roll material feeding device to which a method of the present invention is applied, as an example of an embodiment of the present invention.

2A and 2B are explanatory views of the operation of the roll material feeding device shown in FIG. 1, in which FIG. 2A is a diagram showing the relationship between slip SA and torque TC, and FIG. Current
Diagram showing the relationship between IF, IB and respective torque TC; TCB

FIG. 3 is a flowchart showing processing in a main control unit of the roll material feeding device shown in FIG.

FIG. 4 is a configuration diagram of a conventional roll material feeding device.

5 is an explanatory view of the operation of the roll material feeding device shown in FIG.

6 is a block diagram of a main controller of the roll material feeding device shown in FIG.

[Explanation of symbols]

 AA Roll material feeding device AMA Main device RM Roll material RDS Roll material drive shaft PR1, PR2 Pinch roller ADA control unit MCA main control device IV1 1st inverter M1 1st motor G1 1st reduction gear CT current transformer IV2 2nd inverter M2 Second motor G2 Second reducer

Claims (2)

[Claims] 1. A main shaft and a control unit, wherein the main shaft receives a winding shaft of a roll material obtained by winding a strip material in a cylindrical shape, and transmits a power to the roll material winding shaft, and the roll. The belt has a pinch roller that feeds the strip that is unwound from the strip, and the controller has a first motor that drives the pinch roller and a first motor that controls the rotation speed of the motor. A control device and a second drive device for driving the drive shaft
A method for controlling a roll material feeding device comprising a motor, a second control device for controlling the motor, and a main control device for controlling the first and second motors via the first and second control devices. In the above, the rotation speed of the first motor is controlled so as to be maintained within the predetermined range of rotation speed output from the main control device to the first control device, and the electric power supplied to the first motor is By adjusting the torque of the second motor via the second control device so that the electric power is within a predetermined range that corresponds to the electric power that gives the material within a predetermined range of tension, the tension applied to the strip is adjusted. A method for controlling a roll material feeding device, characterized by controlling. 2. The method of controlling a roll material feeding device according to claim 1, wherein the first motor and the second motor are three-phase induction motors, the first control device is a first inverter, and the second control is performed. The device is a second inverter, the first inverter
Each of the inverter and the second inverter keeps the voltage of a power supply for supplying power to the first motor and the second motor constant, and the power supplies the power to the inside of each of the first motor and the second motor. A device for controlling the rotation speed or torque of each of the first motor and the second motor by controlling the rotation speed of the rotating magnetic field to be created, wherein the first inverter is within a predetermined range input from the main control device. The main controller controls the rotation speed of the first motor so that the rotation speed becomes the rotation speed, and the main controller detects the electric power supplied to the first motor according to the magnitude of the current input to the first motor, By adding or subtracting the torque of the second motor through the second inverter so that the current supplied to the first motor falls within a predetermined range, it is added to the strip material. The method of roll material feeding apparatus characterized by controlling the that tension.