JPS6240930A - Control device for motor - Google Patents

Abstract

PURPOSE:To wind a material by controlling its tension to a prescribed tension, by inputting a signal of the prescribed tension, etc. which are set at the time of winding, to an optimum speed setting device, and calculating and setting an optimum speed of the material. CONSTITUTION:A prescribed tension value for winding a material 19 is set to a material tension setting device 11. An optimum speed setting device 16 which has received this setting signal calculates and sets an optimum speed of the material 19, from other inputted signals of the maximum tension value F0, a material speed V0 of that time, etc., and gives a command to an armature 12 of a motor so that the operation is executed at this speed. Accordingly, the material 19 moves at an optimum speed, and wound to a winder 18 by a prescribed tension.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a motor control device for a drive machine that determines the material speed of a reel for winding up or unwinding a material such as a strip with controlled tension. .

[Prior Art] FIG. 3 shows a conventional control method, in which the winder is controlled to maintain a predetermined tension as described below.

If the tension applied to the material is 1 and the electrical and mechanical losses of the reel are ignored, the torque T of the DC motor for driving the reel is T, (F D ...
It is given by (1).

Here, D is the diameter of the material wound on the reel.

In addition, the winding diameter of the material wound on the reel is the diameter of the reel, the thickness of the material is h1, the reduction ratio between the heavy electric machine and the reel is G
R, if the rotational speed of the motor is N, then D-Do+2h
JHdt ------(2) GR is expressed as:

Furthermore, the output P of the DC motor for driving the reel is P = (CEMF) = ωT if the mechanical loss and iron loss of the motor are ignored.
... (3) ωT, ICNT ...
...(4). However, CEMF is the back electromotive force of the reel driving DC motor, ■ is the armature current of the reel driving DC motor, and ω is the angular velocity.

is obtained. Here, is a constant It becomes possible to control the tension to a predetermined value.

In FIG. 3, (1) is an armature of a controlled reel driving DC motor, (2) is a rotational speed detector connected to this armature and derives a signal N according to the rotational speed, and (3)
is an armature current control device that supplies an armature current to the armature (1) according to an input current reference value, and is fed-punctured with an actual measured value of the armature current from a current detector (4). (5) is a back electromotive force controller that inputs armature current and armature terminal voltage and outputs a field current reference value according to these values. The electromotive force CEMF is also derived. (6) is the back electromotive force controller (5)
The field controller supplies a field current to the field winding (7) according to the field current reference value derived by the field controller, and feeds back the actual measured value of the field current from the current detector (8). (9) is the back electromotive force CEMF derived by the above back electromotive force controller (5)
, the rotation speed N derived from the rotation speed detector (2) and the set arithmetic unit, (10) multiplies the set value F by the material tension setting device (11) and the output of the above arithmetic unit (9). This is a multiplier that calculates the calculation result and supplies it to the armature current control device (3) as a current base * (!). The armature of a DC motor, (13) lri is connected to this armature,
A rotation speed detector detects the rotation speed, (14) a rotation speed control device that controls the rotation speed of the driving DC motor of the driving machine to the input reference speed, and (16) a rotation speed control device that controls the material winding speed. The material speed setting device (15) is a converter that converts the speed set by the material speed setting device into the rotational speed of the driving DC motor of the driving machine.

Next, the operation will be explained.

The material speed is set by a material speed setter (15), converted to a corresponding rotational speed by a converter (16), and controlled by a rotational speed controller (14) to achieve the rotational speed.

The rotational speed signal N of the reel driving DC motor detected by the rotational speed detector (2), the back electromotive force CEMF derived by the back electromotive force controller (5), and the reel diameter setting set in the calculator (9) The value C, the material thickness set value h1, and the multiplier (10) are input to the armature current control device (3) as a number obtained by the arithmetic unit (9). Therefore, as is clear from the above equations (1) to (5), the material tension becomes constant.

Now, Figure 4 shows the characteristics of the reel-driving DC motor driven by the above control device, where the material speed is constant, the vertical axis shows various state quantities, and the horizontal axis shows the material winding diameter. is taking. In FIG. 4, No is the base rotation speed of the reel driving DC motor, ■ is the armature current, φ is the field magnetic flux, V is the armature voltage, and N#- is the rotation speed.

[Problem that the invention seeks to solve]

In a conventional electric motor control device, the setting of the tension of the material wound on the reel and the setting of the material speed, which is the basis of the rotational speed of the reel, are individually and arbitrarily performed.

In order to obtain a predetermined tension, the material speed must be set by referring to a correlation table of material tension and material speed as shown in FIG. If the material speed is set higher than a predetermined speed, there is a problem in that material tension is insufficient, which adversely affects the winding stiffness of the material. FIG. 2 shows the relationship between material velocity and controllable tension.

The present invention has been made to solve these problems, and an object of the present invention is to provide a device that can control the material speed to a predetermined value in which the material tension is set.

[Means for solving problems]

The electric motor control device according to the present invention calculates the material speed at that time from the maximum value of tension applied to the material (this is called the maximum tension value), the minimum coil diameter of the coil to be wound, and the base rotation speed of the electric motor. An optimum speed setting device is provided which calculates and sets the optimum material speed that can control the material tension to a predetermined tension value based on the maximum tension value, the material speed, and the predetermined tension value that is set.

[Function] In the present invention, when a predetermined tension value for winding the material is set, the optimal speed setting device sets the optimal value for the material speed, and the material speed is controlled so as to reach that speed. The tension of the material to be wound up is controlled to a predetermined value.

[Embodiment of the Invention] FIG. 1 is a configuration diagram of an optimal speed control device showing an embodiment of the present invention. In Fig. 1, (1) to (15) are the same as in Fig. 3, so their explanation will be omitted, and 16) determines and sets the optimal speed of the material so that the material tension can be controlled to a predetermined value. (17) is a drive machine, (18) is a winder, and (19) is a material such as a strip.

The tension F applied to the material is calculated from equation (5) and FIG. 4 as follows. When the rotational speed N of the winding machine drive DC motor is in the range where the back electromotive force is constant (rated) (base speed NB H1 maximum speed NT), the armature current is maximum (rated) and the coil diameter is the minimum (minimum coil diameter ), the material tension is at its maximum, and when the rotational speed N is in the range N<NB, the back electromotive force CEMF decreases according to the rotational speed H.

Here, the formula for calculating the tension F is as follows: In the range of NB<N, <NT, CEMF constant (rated) material speed ma = πD N on and rearranging equation (6), F = 2 v """'" °(
7). Therefore, from the mechanical specifications of the winding machine and the rating of the DC motor for driving the winding machine, the maximum tension H'o of the material that freezes is determined by the armature current In (rated), the minimum coil diameter, and the material when the rotation speed is at the base low speed. If the speed is Vo, then F o "" K 2-
......(8) O.

From this, the material speed {circle around (1)} corresponding to the set value F by the material tension setting device (11) when the armature current is a& is determined by the following formula.

From equation (8), substituting equation (9) into equation (7) and rearranging it, we get ■=Eniji'vo... Song (10) Then, the material speed V corresponding to the material tension setting value F is It is set via a converter (15) as a reference speed of a rotation control device (14) that controls the rotation speed of a DC motor that drives a drive machine that determines the material speed of the take-up reel.

Further, in the above-mentioned embodiments, a winder was used, but a rewinding machine may also be used, and the same effects as in the above-mentioned embodiments can be obtained.

[Effects of the Invention] As described above, according to the present invention, a device that calculates and sets the material speed setting based on the material tension can be used to prevent a shortage of material tension. It has the effect of eliminating negative effects on the rolling hardness of the material.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment in which the optimum speed control device of the present invention is incorporated into a motor control device of a drive machine that determines the material speed of a reel for winding material such as a strip, and FIG. Fig. 3 is a block diagram showing an example of a motor control device of a drive machine that determines the material speed of a conventional take-up reel. FIG. 3 is a diagram showing the characteristics of a DC motor for driving a take-up reel. In the figure, (14) is a rotational speed control device, and (16) is an optimal speed control device. In the figure, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] The tension generated by the electric motor that drives the reel that takes up or unwinds the material is limited by the material speed. A control device for an electric motor, comprising a device for deriving a material speed according to tension, and a speed control device for controlling the rotational speed of the electric motor according to the output of the device.