JPS61295897A - Controlling method of helper motor - Google Patents

Abstract

PURPOSE:To prevent a helper motor from tripping due to an overcurrent by optimally controlling a load current to the motor for driving a material to be treated in a continuous process line. CONSTITUTION:A power source in provided with power source units 28A, 28B for supplying power to helper motors 18A, 18B under the control of voltage regulators 26A, 26B, load current adder 32 inputs the values of load currents output from the units 28A, 28B as load current signals IA, IB and adds them, and a driver 24 for dividing the value obtained by the adder 32 by the number of the helper motors in a group. The output of the divider 34 is fed back to voltage regulators 26A, 26B as reference current signal IS.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a method for controlling a helper motor, and particularly to a method for controlling a helper motor, which is suitable for use in preventing tripping due to overcurrent in a helper motor that drives a roll that conveys processing material in each processing section of a continuous processing line. This invention relates to improvements in control methods for helper motors.

[Prior Art 1] Generally, each processing section of a continuous processing line (process line) is provided with a large number of drive rolls and a drive motor for driving the drive rolls in order to convey the processing material. The types of drive motors are (1) electric I5 that controls the tension in the line! (Pridle motor), (2) Roll acceleration/deceleration torque and! There are two types of electric motors (helper motors) that compensate for I impairment. Conventionally, control for driving the helper motors of the above-mentioned operation line has been performed by forming groups of helper motors for each processing section and controlling each group. That is, for example, the second
As shown in the figure, an X roll 12A that conveys the processing material 10,
12B, Y roll 14A, 14B, Z roll 16A, 1
6B drive rolls and helper motors 18A, 18B, 2OA, 20B, 22 that drive their respective drive rolls.
A, 22B in a continuous processing line with each helper motor 18A, 18B, 20A, 20B. 22A and 22B are controlled by forming a group of the helper motors for each processing section 24A and 24B, and controlling the load current in each group by circuits as shown in FIGS. 3(A) and 3(B). I'm doing it. At this time, the continuous processing line performs processing while conveying the processing material 10 in the direction of the arrow. Also, at the same time, Fig. 3 (A) (B)
In the circuit shown in , the voltage regulator 26 is set to l! by a signal that is the sum of the voltage command E and its correction signal G. Adjust the output voltage of source 8I128 to each helper motor 18A, 18B, 20A
, 20B, 22A, and 22B. Note that the value of the output voltage of the power supply unit 28 is kept stable because it is fed back to the voltage command value through the minor lube 30. However, in the circuit shown in Fig. 3, when the mechanical conditions such as the roll diameter of the drive roll (normal roll diameter often changes by about 5%) change, the load is changed to one helper motor. Concentrating on this, the helper motor may enter an overcurrent state and trip (the protection circuit operates and opens the electrical circuit). If the helper motor trips, the drive roll will not be able to compensate for mechanical losses;
Inconveniences such as scratches may occur on the treated material 10. Techniques to prevent such problems include:
There are (1) a method of inserting a series resistor (drooping resistor) into the motor main circuit, and (2) a method of adding an N flow limiting circuit. [Problems to be Solved by the Invention] However, regarding the method shown in (1) above, dr.
The higher the base resistance of the oopi mouth Q resistor, the harder it will be to trip, but this will lead to a decrease in efficiency and a decrease in control response. Regarding the method shown in (2) above, if the circuit constants are set in accordance with the machine conditions, tripping will not occur, but the control response will decrease and the acceleration/deceleration, which is the original purpose of the helper motor, will not occur. Torque and mechanical losses cannot be compensated for adequately. Therefore, in order to fully achieve the purpose of use, it is necessary to change the circuit constant of the current It) II control circuit every time the mechanical conditions such as the roll diameter of the drive roll change. There was a problem in that the limiting circuit could not function satisfactorily.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned conventional problems, and is intended to prevent the helper motor of a continuous processing line from tripping due to overcurrent, and to reduce the adverse effect on the processed material caused by the helper motor tripping. It is an object of the present invention to provide a control method for a helper motor that can be eliminated. [Means for Solving the Problems] The present invention provides a 17 m helper motor method in which each helper motor is divided into groups according to capacity when the helper motor is used to drive a roll that conveys processing material in a continuous processing line. In addition, a dedicated electric power is provided for each helper motor.
A device is installed, and the load current supplied to all helper motors in each group is divided by the number of helper motors in the group to obtain a command value for the load current to be supplied to each helper motor, and the command value is Based on this, the above object is achieved by controlling the load current supplied from the power supply device to each helper motor. [Function] The function of the present invention will be explained in detail below. For example, electrolysis in an electroplating line that electroplates treated materials! Operation is performed using multiple electric FFs with the same specifications.
! This is done by running devices such as rectifiers in parallel. When the above operation is performed, the total value of the current output from each power supply device is controlled, but each m'l! ! The load command to the device is obtained by dividing the total value of the current by the number of power supply devices, and the load command for each of the above 3! Since the power is provided to the power supply unit, only one MaH unit will not be overloaded. The present invention is based on the above-mentioned Ni! ! This was achieved by applying the device control method to the helper motor FMI I11 method. In other words, when using helper motors to drive the rolls that convey processed materials in a continuous processing line, each helper motor is divided into two groups according to capacity, and a dedicated power supply is provided for each helper motor, and the power supply within each group is divided into two groups. The command value of the load current supplied to each helper motor is obtained by dividing the value of the load current supplied to all helper motors by the number of helper motors in the group, and based on the command value, the load current supplied to each helper motor from the power supply is The load current supplied to m+i is controlled. Therefore, when the helper motor drives the material to be processed, the load current of the helper motor can be adjusted optimally.
Therefore, even if the roll diameter of the drive roll or the mechanical conditions change, the helper motor can be prevented from tripping due to overcurrent. Further, it is possible to eliminate the adverse effect on the processing material caused by tripping of the helper motor. Embodiment 1 An embodiment to which the helper motor control method according to the present invention is applied will be described in detail below. In this embodiment, helper motors 18A, 18B, 2OA, 20B, 22A, 22 of the continuous processing line shown in FIG.
The present invention is applied to a power supply device having a circuit as shown in FIG. 1, which supplies an N source to B. In FIG. 2, drive rolls 12A, 14A, 16A in processing section 24A of the continuous processing line are:
Each of them has different specifications, and the helper motors 18A, 20A, 22A that drive the respective drive rolls 128, 14A, 16A also have different specifications such as capacity. Further, the relationship between each of the drive rolls 12B, 14B, 16B in the processing section 24B and the relationship between each of the helper motors 18B, 20B, 22B is also determined by the processing section 24A1. : They are considered to be different in the same way as the relationships in . urge, drive rolls 12A and 12
B, specifications of 14A and 148, and 16A and 16B, and helper motors 18A and 188.2OA,! :2OB, and 22A and 228(7) type 111t are considered to be the same. It goes without saying that the drive rolls and helper motors having the same numbers shown in FIG. 2 have the same capacity and specifications. The helper motors 18A, 18B, 2OA, 2OB, 2
2A and 22B are formed into groups for each helper motor with the same specifications, and the NWA device that supplies power to the helper motors in each group is connected to each other as shown in FIG. In other words, the power supply device that supplies the helper motors 18A and 18B with the 1! Correction signal G that corrects the set voltage command E and gil! pressure command E by manual setting
a voltage regulator 26A126B that adjusts the voltage applied to the helper motors 18A, 18B according to the sum of , 28
B, and a load current adder 32 that inputs and adds the values of the load currents output from the respective power supply units 28A and 28B as load current signals rA and IB, and the value determined by the load current adder 32. A divider 34 is provided for dividing the number of helper motors in the group. In addition, 30 in Figure 1 (A)
A and 30B are connected to the voltage regulators 26A and 26 in order to keep the voltage output from the power supply units 28A and 28B stable.
This is a minor loop that feeds back to B. Also, 3
6 is the reference NR multiplied signal s output from the divider 34.
This is a feedback loop that feeds back the voltage to the voltage regulators 26A and 26B. On the other hand, the helper motors 20A and 20B are connected to an N source device as shown in FIG. 1(B), and
A power supply device as shown in FIG. 1(C) is connected to the helper motors 22A and 22B. Figure 1 (B) (C
) The details of the configuration of the power supply device shown in FIG. 1A are the same as the power supply device shown in FIG. 18A, 188.20A, and 208.
Groups 22A and 228 are formed and equipped with a power supply device as shown in FIG. The effects of the embodiment will be explained below. Processing material 10 when processed in the continuous processing line shown in Fig. 2
is processed while being forwarded in the same way as Takeda's conventional example. At this time, helper motors 18A, 18B, 2OA, 20B
, 22A, 22B (A>(B))
A voltage command (a speed command similar to m) E common to the continuous processing line is given to the power supply device shown in (C), and a correction signal G is added to the voltage command E by manual setting, and a voltage regulator 26A,
26B. The voltage regulators 26A, 26B control the power supply units 28A, 28B according to the input signals E, G.
and each helper motor 18A, 18B, 2OA, 2
1 given to 0B, 22A, 22B! Adjust the voltage of the source. Here, the helper motor 18A (*The charging current is rated at 7
When the drive roll 12A driven by the mechanical load (assumed to be 0%) is
If it is assumed that the load current output from the other power supply unit 28B is 50% higher than the rated current, the helper motor 18A will have an overcurrent of 20% higher than the rated current, so after a few seconds, the overcurrent will cause the helper motor 18A to A trip occurs in the helper motor 18A. In such a case, the above-mentioned 1 il! The procedure for controlling the power supplies 28A and 28B of the device is as described below. That is, the i! The values of the load currents output from the power supply sections 8A and 28B are input to the load M current adder 32 as load current signals IA and 1B. The load current adder 32 uses the load current signals IA and 1B to
Total value of load current values output from 8B<70+ (
70+50)-190%) and input the total value to the divider 34. , the divider 34 divides the total value of the input load current into the number of motors in the group (two in this case).
[(190÷2-95%)] is obtained, and the value is used as the reference N current signal Is to be applied to the voltage regulator 26 via the feedback loop 36 and the summing points 38A and 38B.
A, input to 26B. At this time, the addition point 38
In A and 38B, the base 1m flow @IS and each load 1! A signal of the difference value from the current signals IA, IB is determined and is inputted to the voltage regulators 26A, 26B via summing points 40A, 40B. The voltage regulator 26A controls to lower the voltage output from the power supply unit 28A according to the input difference value signal, thereby reducing the value of the load 'R current input to the helper motor 18B. . On the other hand, the other voltage regulator 26B controls the voltage output from the other power supply section 28B to increase in accordance with the input difference value signal, and controls the load current input to the helper motor 18B. Increase the value of In this way, by adjusting the voltage output from the power supply units 28A and 28B,
The value of the load current input to each helper motor 18A, 18B is balanced to eliminate the overcurrent condition (120%→90%) of the helper motor 18A. Therefore, the helper motor 18A can prevent tripping. In addition, other helper motors 2OA
, 20B, 22A, and 22B.
) 'R power supply device shown in (C), said helper motor 18A
, 18B performs the same control as the power supply device shown in FIG. 1(A). Therefore, helper motor 2OA, 2
0B, 22A, and 22B do not cause tripping due to overcurrent. In the above embodiment, helper motors with the same specifications, for example 18A and 18B, are grouped together and overcurrent control is performed using a relatively simple circuit, but the present invention is not limited to this. , the load current adder 32 multiplies the load current values of helper motors with different specifications by a coefficient.
or by multiplying the output of the divider 34 by a certain coefficient to control the voltage and load current output from each power supply unit 28A, 28B, and control helper motors with different specifications as the same group. is also possible. [Effects of the Invention] As explained above, according to the present invention, it is possible to optimally control the load current of the helper motor that drives the processing material in the continuous processing line, so it is possible to prevent the helper motor from tripping due to overcurrent. It is possible. Therefore, even if the O-hole diameter of the drive roll in the continuous processing line or the machine conditions change, the helper motor can automatically cope with the change without tripping. It has the excellent effect of being able to prevent the adverse effects that occur on the treated materials. FIG. 2 is a block diagram showing the structure of a power supply device to which the above-mentioned embodiment is applied. 10... Processing material, 18△, 18B, 2OA, 2C) B, 22A, 22B... Helper motor, 26.26A, 26B... Voltage regulator, 28.28A
, 28B...Power supply section, 32...Load current adder, 34...Divider. Agents Ron Takaya, Kei Matsuyama
Figure 1 on the right

Claims (1)

[Claims] When driving rolls that convey processing materials using helper motors in a continuous processing line, each helper motor is divided into groups according to capacity, and
A dedicated power supply is provided for each helper motor, and the command value of the load current supplied to each helper motor is calculated by dividing the value of the load current supplied to all helper motors in each group by the number of helper motors in the group. A method for controlling a helper motor, comprising: determining the command value, and controlling a load current supplied from the power supply device to each helper motor based on the command value.