JPS6210113B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a variable speed control device for an electric motor,
In particular, the present invention relates to a control device suitable for controlling a winding machine for iron, paper, etc.

Conventionally, the tension control of the winder has been incorporated into a variable speed drive, so that a drive that performs normal speed control cannot be used as the drive for the winder.

FIG. 1 shows a conventional block diagram of a winder control device for a DC motor. The DC voltage supplied to the electric motor 2 that drives the winder 1 is controlled by controlling the current angle of the forward converter 3 with a phase adjuster 4. The input of the phase regulator 4 is given through a current regulator 5 for making the armature current detected at the input side of the forward converter 3 into a minor loop, and the current setting input of the current regulator 5 is the back electromotive force of the motor 2. from regulator 6. The back electromotive force is detected by the calculator 7. The back electromotive force regulator 6 is supplied with the output of the tension calculator 8 in addition to the winding speed V of the winder 1, and the tension calculation is performed using acceleration and deceleration signals from the differential calculator 9 which receives the winding speed V as input. This is performed by receiving the input through the electric setting device 10 and the setting input of the tension setting device 11.

On the other hand, the field control of the electric motor 2 is performed by controlling the changeover switch 13 by a three-position adjuster 12 that receives the winding speed V and the output of the counter electromotive force calculator 7, and controls the electric setting device 14 linked to the electric setting device 10. The control motor 15 for driving is driven in forward and reverse directions, the output of the electric setting device 14 is used as a current signal of the current regulator 16, and the output current of the field power source 18 is controlled by the phase regulator 17.

As mentioned above, the conventional winding machine control device consists of field control to keep the ratio of winding speed and back electromotive force constant, and armature current control to keep the tension at a set value. A drive device for speed control cannot be used, and a dedicated drive device for the winding machine is required, resulting in an increase in costs.

The present invention has been made in view of the above-mentioned problems, and provides a control device that uses a normal variable speed drive device to control a winder and also enables variable speed control of an electric motor that requires torque control. The purpose is to

FIG. 2 is a block diagram showing one embodiment of the present invention, which is applied to winder control. Components that are the same as those in FIG. 1 or have the same functions are indicated by the same reference numerals. In FIG. 2, the speed regulator 20 is provided with a drooping characteristic, and the tension is set by the setting device 1.
Calculations for maintaining the set value of 1 are performed by the computer 21. In addition to the set value of the tension setting device 11, the calculator 21 includes the output of a speed generator 23 that detects the winding speed V from the rotational speed of the idle roll 22, and a speed generator 24 that detects the winding machine rotation speed _nM . A speed command n _S is provided to the speed regulator 20, and speed control is performed by armature current control. The droop characteristic imparted to the speed regulator can be obtained, for example, by using a proportional regulator as the speed regulator. In this case, desired drooping characteristics can be set by appropriately adjusting the proportional gain. The field current regulator 16 is equipped with a known automatic field weakening control function.

In this configuration, calculation of the speed setting n _S of the winding machine 1 by the calculator 21 will be explained. First, the coil diameter D during winding for calculating the tension component τ _T of the winder and the acceleration/deceleration component torque τ _a is determined by the speed generator 23, 2
From the winding machine rotational speed n _M (rpm) and winding speed V (m/min) detected in step 4, it can be calculated as D=V/πn _M (1). From this coil diameter D, the tension torque τ _T is τ _T =T・D/2 (Kg−m) ……(2). However, T is the tension setting value (Kg).

On the other hand, the flywheel effect GD _P ² for the winding coil is GD _P ² =K [(D/ _DR ) ⁴ -1] ...(3). Here, D _R is the reel diameter, and K is a constant determined from the maximum coil portion GD ² . Therefore, the total flywheel effect GD〓 ² in terms of the motor shaft is the fixed flywheel effect GD _M ² determined by the reel, motor rotor, etc. plus the coil component GD _P ² in equation (3) above, that is, GD〓 ² = GD _M ² + GD _P ² (Kg−m ² ) ...(4). From (3) and (4) above, the acceleration/deceleration torque τ _a is the value obtained by differentiating the winding machine rotation speed n _M and GD〓 ² τ _a = 2π・GD〓 ² /4g・dn _M /dt ( kg-m)
...(5) can be calculated.

Therefore, the torque τ _M of the electric motor 2 to maintain the tension at the set value is τ _M = τ _T + τ _a (Kg−m) ...(6), and the motor torque τ is determined according to the drooping characteristics of the speed regulator 20. The winding machine speed setting for generating _M is determined and set as the command n _S of the speed regulator 20.

FIG. 3 shows the relationship between motor torque τ _M and set speed n _S. Now, assuming that the speed regulator 20 has the drooping characteristic shown in FIG. 3, the torque generated by the motor when the set speed n _S is applied is τ _M , and when the speed is n _S ′, the torque generated by the motor is τ _M ′. Therefore, once the required motor torque τ _M is determined, n _S to be applied to the speed control system is determined.
can be determined.

Although the embodiment has been described as a control device for a winding machine, the present invention is not limited thereto, and can be applied to an electric motor application device that requires torque control and current control.

As explained above, in the control device according to the present invention, the speed regulator has drooping characteristics, the torque required for the electric motor is calculated on the computer side, and the set speed determined from this calculation result and the drooping characteristics of the speed regulator is adjusted. Since this is applied to the regulator, there is an advantage that a normal variable speed drive device can be used as the drive device of the electric motor in winding machine control and the like.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a conventional winding machine control device, FIG. 2 is a block diagram showing an embodiment of a motor control device according to the present invention, and FIG. 3 is a block diagram for explaining the operation of FIG. It is a characteristic diagram. 1: Winder, 2: Electric motor, 4, 17: Phase adjuster, 5, 16: Current adjuster, 7: Back electromotive force calculator, 20: Speed adjuster, 21: Computer.

Claims (1)

[Claims] 1. In a motor control device that controls the output torque of the motor by adjusting the current in the minor loop of the speed regulation loop, the speed regulator for forming the speed regulation loop has drooping characteristics, and a computer calculates the necessary Torque is calculated, and a set speed determined from the drooping characteristics of the speed regulator is calculated based on the calculated torque and the rotational speed of the electric motor at that time, and the calculated set speed is applied to the speed regulator. A control device for an electric motor, characterized in that it commands.