JP3289754B2 - Winding and rewinding control device by static tension of inverter driven motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for winding and rewinding paper, metal, film and the like driven by an induction motor.

[0002]

2. Description of the Related Art Japanese Unexamined Patent Publication No.
1-113117, JP-A-1-192658 etc. and especially recent literature
5-111287 [hereinafter referred to as “conventional example”]. In this prior art example, as shown in FIG. 4, [circuit components which are not relevant to the present invention are omitted.] The paper on the rewinding paper roll 401 is wound on the paper roll 402 via the paper roll 402 and the winding drum. When winding onto a roll, the speed control of the motor 422 for the rewinding paper roll is performed by selecting either the normal tension setting device 428 or the stall tension setting device 428 by selecting one of the tension switching contacts 428 and 430.
Negative feedback of the voltage corresponding to the paper tension detection value of the line that is rewound to any one of the power supply voltages of No. 9 controls the thyristor power supply 434 based on the deviation voltage signal, and reduces the torque generated by the motor 422 for the rewound paper roll. I am adjusting. The field is controlled from the speed setting voltage based on the paper coil width and the detection speed of the motor 422 for the rewinding paper roll.

[0003]

However, in the prior art, both of the above-mentioned documents both control the winding and rewinding motor by the DC motor, and the armature current and the field current are respectively different armature and field currents. The armature current is controlled by the thyristor so that an appropriate current flows through the magnetic circuit, and the exciting current from the exciter is controlled. The control between the two can be made freely. However, such control theory cannot be applied to the winding / rewinding motor control by the induction motor, which is an AC machine, intended by the present invention. In other words, although the field current in each document is sufficient for adjusting the current in the field circuit through which the current flows, in an induction motor, there is no distinction between a field winding and an armature winding as in a DC motor, and a single primary winding is used. The primary current I ₁ flowing through the primary winding is 90 ° in electrical angle with the exciting current I ₀ .
It would represent a composite vector of the secondary current I ₂ of the phase difference. Therefore, the phase difference の between the primary current I ₁ and the secondary current I ₂ is one parameter for controlling the exciting current I ₀ ,
One of the parameters is that the amplitude of the primary current I _1. Therefore, while controlling the exciting current I ₀ with the phase difference の between the primary current I ₁ and the secondary current I ₂ and the amplitude of the primary current I ₁ , that is, changing the exciting current I ₀ from the three-phase primary AC current While performing vector control so as to divide the current into the secondary current I ₂ ,
How to adjust the static tension is the subject of the present invention, and if anything, prior art cannot be found at present. Here, the present invention provides a winding and rewinding control device using static tension in a pioneering inverter-driven general-purpose induction motor for eliminating all of the high costs of DC machines, difficulties in maintenance, and complicated bottlenecks. The purpose is to do this.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a winder and a rewinding device for winding a product under tension control, which are driven by a vector-controlled inverter driving device. Connected to an induction motor to be wound, a conveying roll for running a linear or belt-shaped winding and rewinding member to be wound and rewinded, and a tension for detecting a tension of a winding and rewinding member of the winder and the conveying roll. A detector, a diameter calculator for calculating the diameter of the winding and rewinding member from the respective speeds of the winder and the transport roll, and a winding winding based on a deviation between the tension set by the tension setting unit and the detected tension from the tension detector. A tension controller for controlling the tension of the return member, and a current for static tension control for applying tension while keeping the running speed of the winding / rewinding member at zero by input from the tension controller and the diameter calculator. A static tension current calculator for calculating, and an inverter drive device for operating a winder that performs vector control based on the exciting current and the secondary current calculated by the calculation of the static tension current calculator, and is set by a tension setting device. This is a winding and rewinding control device based on the static tension of the inverter-driven motor having a control function of determining the primary current of the induction motor to be minimized with respect to the static tension. The static tension of the inverter-driven motor according to the preceding paragraph, further comprising a switching circuit having a circuit configuration that directly supplies the output of the calculator to the excitation current calculator and the secondary current calculator and that directly outputs the output of the tension controller to the secondary current calculator. Is a winding and rewinding control device.

[0005]

Since the present invention constitutes such a control system, the exciting current and the secondary current can be determined so that the primary current is minimized in a range where the control is stable. The self-extinguishing transistor constituting the inverter near zero is prevented from being uncontrollable from being destroyed due to excessive primary current, and the reliability of the driving device is improved.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a circuit configuration of one embodiment of the present invention. It is assumed that the linear or belt-like traveling member 120 is wound in the direction of the arrow. The line speed of the conveying roll 1 is set by a line speed setting device 15, and a speed deviation from the detected speed is determined by a speed control device 8. The speed deviation is used to convey the conveying roll motor 9 via a conveying roll driving device 10.
, And the transport roll 1 connected thereto is caused to travel at a set speed. Numeral 11 detects the actual speed of the transport roll motor 9, feeds it back to the speed controller 8, and forms one information input signal to the diameter calculator. The traveling member 120 transported and transported by the transport roll 1 is wound by the winder 2. At this time, the winder 2 is driven by the winder motor 16 to wind the traveling member 120 at a rotation speed at which the tension is set. As for the tension control of the winder 2, a tension set value signal is given to the tension command setter 5 according to the tension set by the static tension setter 13 or the operation tension setter 14, where the tension set value signal is corresponded. A tension command is generated and given as one input signal to the next tension controller 4, a deviation from the actual tension from the other tension detector 3 is calculated, and sent to the calculator 21.

Further, the actual winder motor speed from the winder motor 16 is detected by the winder speed detector 18,
One of the information input signals of the diameter calculator 12 is formed, and the diameter of the member 120 being formed on the winder 2 is derived from the speed ratio of the two together with the traveling speed of the other transport roll 1 by the diameter calculator 12. The tension control value and the diameter value thus obtained are added to the static tension current calculator 21. The static tension current calculator 21 calculates the electrical phase angle of the primary current with respect to the secondary current and the amplitude value thereof based on the above two control elements, and based on the static tension control signal, stabilizes the control. While the primary current is minimized [that is, there is a minimum current that is uniquely determined by the rating of the induction motor to be controlled, and it is the closest primary current with a good power factor], 1 The value of the next current and the value of the exciting current are determined, and the former is calculated by the exciting current calculator 19, and the latter is calculated by 2
The current is calculated by the next current calculator 20 and adjusted to a signal voltage suitable for the control calculation in the next stage.
To enter.

The inverter driving device 17 performs vector control of the winder motor 16 composed of an induction motor so as to depend on two input control signals [information signals of an excitation current and a secondary current]. By operating the winder 2 in this manner, the running member 120 can be wound with the desired static tension. Now, let's expand on the theory of why this configuration can control the set static tension a little more. To restate the mainstream of control, the winder motor 16 is driven by the inverter drive device 17 to transmit power to the winder 2. The tension of the winder motor 16 is controlled by the tension controller 4 in accordance with a command from the tension command generator 5. At this time, the tension is measured by the tension detector 3 and used as a feedback signal. Similarly, the transport roll 1 has a transport roll motor 9 and a transport roll driving device 10, and a line speed setting device 15.
The speed is controlled by the speed controller 8 in accordance with the above-mentioned command.
The speed feedback signal is transmitted from the transport roll speed detector 11. The diameter of the winder 2 [that is, the running member 120
Is calculated by the diameter calculator 12.

In such a configuration, in the inverter driving device 17, the tension F of the material is expressed as F = k × T / D as proportional constant k, winder motor torque T, and diameter D of the traveling member 120. .. (1) = k ₁ × φ × I / D (2) Here, since the winder motor torque T is proportional to the field φ of the motor and the motor current I, the equation (1) can be rewritten as the equation (2) [k ₁ is a proportional constant]. In general, in induction motors,
Assuming that the primary current I ₁ , the excitation current I ₀ , and the secondary current I ₂ , φ = k ₂ × I ₀ ... (3) I = k ₃ × I _2. (4) (I ₁ ) ² = (I ₀ ) ² + (I ₂ ) ² ... (5) tan θ = I ₀ / I ₂ …………………… (6) Here, k ₂ and k ₃ are proportional constants, θ is a power factor angle, and the closer to 0, the better the power factor. Summarizing the above, the equation (1) can be expressed as follows: F = k ₁ × k ₂ × I ₀ × k ₃ × I ₂ / D = k ₄ × I ₀ × I ₂ / D (7) ). Previously concept of torque control of the winder motor in an induction motor of the (7) from the fact that the change in diameter on the basis of the expression is moderate, in proportion slow excitation current I ₀ responsive to diameter D correction tension control To the secondary current I ₂
The above-mentioned concept is applied to the control for applying tension while keeping the traveling speed at zero, that is, the so-called static tension control.

However, in general, a motor that performs winding and rewinding has a large diameter control range of about 1: 4, and has a low base rotation speed, which is the rotation speed at which field control is started, and therefore has a large number of poles in an induction motor. Thus for the excitation coil is large, inevitably excitation current I ₀ is large. That is, the power factor θ is poor, and the static tension is 1/3 of the rated value in the conventional control method.
Thus, even if the secondary current I ₂ is reduced to 1/3, the primary current I ₁ is not reduced to 1/3 because of the exciting current I ₀ , and the drive device generates useless current. Therefore, the winding and rewinding control device using the static tension of the inverter drive motor according to the present invention performs the exciting current I when performing the static tension control.
_It has a function of determining the ₀ and the secondary current I _{2 so} that the primary current I ₁ is minimized in a range where the control is stable. That is, the function is intended by the circuit configuration as in the embodiment shown in FIG. Can be achieved.

The specific means of the static tension calculation [static tension control method] will be described in detail below. _First , if I _0,100 is the excitation current at 100% tension, I _2,100 is the secondary (torque) current at 100% tension, and I _1,100 is the primary current at 100% tension, I _1,100 = ｛ (I _0,100 ) ² + (I _2,100 ) ² ｝ ^1/2 (8) Further, the power factor angle θ shown in the above equation (7) is tan θ = I ₀ /
It is I _2. Here, the motor torque T ₁₀₀ when the 100% tension of the induction motor is _{T 100 = k 4 × I 0,100} × I 2,100 ........................ (9). However k ₄ represents a constant.

_Assuming that the ratio of the static tension to the operating tension is δ (where 0 ≦ δ ≦ 1), the torque T _S for realizing the static tension is T _S = k ₄ · δ × I _0,100 × I _2,100 = k ₄ × I _0,100 × (δ · I _2,100 ) (10) In this way, the secondary current control system of the formula (10) is a conventional means. The primary current I _{1, S} for realizing the torque T _S for realizing the static tension is I _{1, S} = ｛(I _0,100 ) ² + (δ · I _2,100 ) ² ｝ ^1/2 (11) However, this is not the minimum. Therefore, the present invention takes measures to minimize the primary current I1 _{, S} for realizing this static tension. The minimum value I ₁ of the primary current for realizing the torque T _{S, Smin} is determined as follows.

That is, the torque is the product of the exciting current I ₀ and the secondary current I ₂ , and the primary current I ₁ is ｛(I
₀ ) ² + (I ₂ ) ²励^1/2 , the excitation current I ₀ ,
The secondary current I _2, I ₀ = I _2, thus the exciting current I ₀ for realizing torque T _{S, S,} the secondary current likewise that time I _2, the _{S I 0, S = I 2} , _{In the case of S} ... (12), the minimum value I1 _{, Smin of the} primary current is realized. The torque T _S for realizing the static tension at this time is constant, and (10)
Since T _S = k ₁ · δ × I _0,100 × I _{2,100 as described} in the equation, the equation (11) is obtained from the equation (12) as follows: I _{0, S} = I _{2, S} = (δ × I _0,100 × I _2,100 ) ^1/2 ... (13), which is calculated by the static tension current calculator 21 and the primary current I for realizing the torque T _S at this time.
_{1, S} is [since tan θ = π / 4] I _{1, S} = ｛(I _{0, S} ) ² + (I _{2, S} ) ² ｝ ^1/2 = (2) ^1/2 · δ × I _0,100 × I _2,100 (14)

However, when the exciting current I _{0, S} <I _{0, min} [the lower limit primary current value of the stable control], I _{0, S} is the I _{0, min}
I _{0, S} = I _{0, min} ... (15) The secondary current I _{2, S} is I _{2, S} = (δ × I _0,100 × I _2,100 ) / I _{0, min} ... (16) Further, when the secondary current I _{2, S} ≧ I _2,100 , it is limited to I _{2, S} = I _2,100 (17). Therefore, at this time, I _{0, S} = δ × I _0,100 ... (18)

FIG. 2 is a flowchart showing a method of calculating the above-described static tension current. Thus, the secondary current I ₂ to achieve a torque T _S to realize resting _{tension, S} and exciting current I _{0, S} is determined. FIG. 3 is a block diagram showing the circuit configuration of this embodiment when only the operation tension control is performed without applying the static tension. That is, when the stall tension is set, the contact 6 that is closed when the stall tension is set is turned on, and when the operating tension is controlled, the contact 7 that is closed when the operating tension is controlled is turned on. When the contact 6 is turned on, the auxiliary contact 6a is also turned on, and the static tension current calculator 21 is turned on to perform the calculation with the previous static tension. However, when the auxiliary contact 6a is off, the control system of FIG. It is formed.

[0016]

As described above, according to the present invention, the use of a static tension current setting device and the like makes it possible to use a wasteful control system.
It is possible to obtain a special effect of significantly contributing to suppression of the secondary current, extension of the life of the inverter, and improvement of operation stability.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a circuit configuration during static tension control according to an embodiment of the present invention.

FIG. 2 is a flowchart illustrating a procedure for determining a static tension to be minimum in one embodiment of the present invention;

FIG. 3 is a block diagram showing a circuit configuration at the time of operating tension control in one embodiment of the present invention.

FIG. 4 is a block diagram showing a circuit configuration of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Conveyance roll 2 Winder 3 Tension detector 4 Tension controller 5 Tension command generator 6 Contact closed at stall tension control 6a Auxiliary contact linked with contact 6 7 Contact closed at operation tension control 8 Speed controller 9 Transport Roll motor 10 Carrier roll drive device 11 Carrier roll speed detector 12 Winder diameter calculator 13 Static tension setter 14 Operating tension setter 15 Line speed setter 16 Winder motor 17 Inverter drive 18 Winder speed detector 19 Excitation current calculator 20 Secondary current calculator 21 Static tension current calculator 120 Members made of wire or belt

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B65H 23/192 B21C 47/00 B65H 23/198

Claims (2)

(57) [Claims] 1. A winder and a rewinding device for winding a product under tension control, comprising: a winder connected to an induction motor driven via a vector-controlled inverter drive; And a tension detector for detecting the tension of the winding and rewinding member of the winder and the transporting roll, and a winding and winding device based on the respective speeds of the winder and the transporting roll. A device provided with a diameter calculator for calculating the diameter of the return member, and a tension controller for controlling the tension of the winding / rewinding member based on a deviation between the tension set by the tension setting device and the detected tension from the tension detector. A static tension current calculator for calculating a current for static tension control for applying tension while keeping the running speed of the winding and rewinding member at zero by an input from the tension controller and the diameter calculator; The excitation current and the secondary current calculated by the operation of the static tension current calculator of the present invention are respectively transmitted to the inverter drive device that performs vector control and operates the winder through the excitation current calculator and the secondary current calculator. Having a control function of equally determining the exciting current I ₀ and the secondary current I ₂ so that the primary motor current of the induction motor becomes minimum with respect to the static tension set by the tension setting device. A winding and rewinding control device using static tension of an inverter drive motor. 2. A switching circuit having a circuit configuration in which the output of a diameter calculator is directly supplied to an exciting current calculator and a secondary current calculator during operation tension control, and the output of a tension controller is directly provided to a secondary current calculator. The output of the diameter calculator is directly input to the excitation current calculator and the secondary current calculator, and the output of the tension controller is directly input to the secondary current calculator to perform static tension control. 2. The winding and rewinding control device according to claim 1, further comprising means capable of controlling the operating tension.