JP2789412B2 - Load distribution control circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generally relates to a load distribution control circuit for driving a single load by a plurality of drive units in a wide range of general industries, and for stably and favorably distributing each load. Things.

[0002]

2. Description of the Related Art Conventional load distribution uses the following three types. When the master torque (current) command device is simply distributed to the slave side, When the master torque (current) command value is distributed as the limiter value of the slave side torque (current) control, the master current, feedback and the slave side Are compared, and the difference is added to or subtracted from the speed setting on the slave side.

[0003]

However, each of the conventional systems has the following problems. In item (a), simply the torque (current value) on the master side
, The control is determined by the characteristics of the torque (current) control device. Further, when the load is not a single load (such as breakage of the load material), control becomes completely impossible. In the item (b), there is a variation in each characteristic until the limiter is applied. In the item (c), it cannot be applied to the case without the current control system. SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has as its object to provide a load distribution control circuit that solves these problems (a) to (c).

[0004]

Means for achieving the object is to form a speed control for both the master and the slave. The master (slave) command value and the slave torque (current) command value are combined with each other. And a control circuit for adding and subtracting the calculation result to a torque (current) command value on the slave side.

[0005]

With such a control circuit, the torque (current) command values of the master and the slave are always controlled to be equal, and their load ratios are also uniform.
By this means, the above and the problems are solved,
Further, the above term is solved because the torque (current) command value is calculated. Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

[0006]

1 is an overall configuration diagram showing an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a speed setting unit, 2 denotes a multiplier, 3 denotes a dead band, and 4, 5, 10, and 20 denote arithmetic units. , 11, 21 are speed controllers, 12, 22 are current controllers, 13, 23 are drivers, 14,
24 is a motor, and 15 and 25 are rotation speed detectors. That is,
The signal output from the speed setting unit 1 is the arithmetic unit on the master side.
10, and a slave side computing unit 20.One output signal is transmitted to a motor 14 via a speed controller 11, a current controller 12, and a driver 13, and the other output signal is transmitted to a speed controller.
The signal is transmitted to the motor 24 via the arithmetic unit 5, the current controller 22, and the driver 23.

At this time, the torque (current) command value from the speed controller 11 on the master side is input to the arithmetic unit 4 via the multiplier 2 for equalizing the load ratio of the master and the slave.
A torque (current) command value from the slave speed controller 21 is also input, and the result of the comparison operation by the calculator 4 is input to the dead band 3, and this output is output from the slave speed controller 21. The signal is input to the arithmetic unit 5 together with the signal.
Note that the coefficient of the multiplier 2 is K = 1. In some cases, the current controllers 12, 22 are not used.

[0008]

As described above, according to the present invention, when a single load is driven by a plurality of motor controllers, stable and good load distribution control can be performed with a constant load factor. .

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention.

[Explanation of symbols]

 1 Speed setting unit 2 Multiplier 3 Dead band 11 Speed controller 12 Current controller 13 Driver 14 Motor 15 Revolution detector 21 Speed controller 22 Current controller 23 Driver 24 Motor 25 Revolution detector

Claims (1)

(57) [Claims] 1. A control device for driving a single load connected by a machine or a load material by a plurality of motor control devices, wherein one is a master, the other is a slave, and the other is a slave. A torque (current) command value as a speed control result is compared with the torque (current) command value on the slave side, and the calculation result is compared with the torque (current) on the slave side.
A load distribution control circuit characterized by adding to and subtracting from a command value.