JPH04289794A - Line speed controller - Google Patents

Abstract

PURPOSE:To prevent runaway of motor through a simple constitution. CONSTITUTION:Speed detection outputs are introduced from F/V converters 2, 2A to a high signal priority detector 7 where one having higher absolute value is selected. It is then imparted with a polarity corresponding to an output from a rotational direction detector 3A fixed to motor 9 side. According to the constitution, detection of rotational direction is not required on the side of a pulse generator 1 and the F/V converter 2 and thereby the constitution is simplified, resulting in prevention of runaway of motor due to directional unmatch of the line and the motor.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a line speed control device for a winder used in steel plate, paper manufacturing lines, etc.

0002

[Prior Art] Fig. 2 is a block diagram showing a conventional example of this type, in which 1 and 1A are pulse generators (PG), 2 and 2A are pulse generators (PG);
is an F/V (frequency/voltage) converter, 3, 3A is a rotation direction detector, 4, 4A, 5, 5A are switches, 6, 6A are inverting amplifiers, 7 is a high signal priority detector, 8 is an inverter unit , 9 is a motor, 10 is a transmission, 11 is a winding machine, 12
is the conveyed material. That is, pulse generator 1,
1A is of a type that outputs a two-phase signal, for example, so that the F/V converter 2, 2A can obtain a voltage signal according to the speed, and the rotation direction detector 3, 3A.
The direction of rotation is detected at . Therefore, if clockwise rotation is (+) and counterclockwise rotation is (-), the switches 4 and 4A are closed by the outputs of the rotation direction detectors 3 and 3A during clockwise rotation, and the F/ V converter 2
, 2A are directly applied to the high signal priority detector 7. On the other hand, during counterclockwise rotation, the switches 5 and 5A are closed by the outputs of the rotation direction detectors 3 and 3A, and the inverting amplifiers 6 and 6 are connected to the outputs from the F/V converters 2 and 2A.
It is given (-) polarity by A and is given to the high signal priority detector 7.

The high signal priority detector 7 is connected to the switch 4 or 5.
The line speed signal applied via the switch 4A or the motor speed signal applied via the switch 4A or 5A are compared in absolute value level, and the higher signal is selected and output. At this time, the output of F/V converter 2 is higher than that of F/V converter 2A.
The line speed signal side is normally selected. The reason why not only the line speed signal but also the motor speed signal is introduced is to prevent the motor from running out of control if the material 12 is missing for some reason. The output of the high signal priority detector 7 is given to the inverter unit 8 as the line speed actual value or detected value, and is compared with the line speed command value input separately here to obtain an output according to the deviation. Motor 9 is controlled. Since the motor 9 is coupled to the winder 11 via the transmission 10, the material 12 is wound up under the control of the motor 9. The high signal priority detector 7 is composed of a diode, an operational amplifier, etc., but if details are required, please refer to Japanese Patent Laid-Open No. 105870/1983.

0004

[Problem to be Solved by the Invention] However, with this method, when inputting the line speed to the high signal priority detector, there is a risk that the motor will run out of control unless it is input with the polarity that matches the rotational direction of the motor. Particular attention must be paid to the wiring from the pulse generator and F/V converter to the high signal priority detector. Furthermore, it is necessary to detect the rotational direction polarity for both the line speed and the motor speed, resulting in a problem that the circuit configuration becomes complicated and expensive. Therefore, an object of the present invention is to provide a line speed control device that can prevent motor runaway with a simple configuration.

[0005]

[Means for Solving the Problems] In order to solve such problems, the present invention detects the line speed of the material being wound up by a winding machine and the rotational speed of an electric motor coupled to this winding machine. In a line speed control device that normally controls the motor speed based on the detected line speed value, and when the material is missing, the motor speed is controlled based on the detected speed value of the motor,
a selection output means that compares the line speed detection value and the motor speed detection value and selects and outputs the one with the larger absolute value; and imparts rotation direction polarity detected via the electric motor to the output. The present invention is characterized in that the polarized speed signal is used as a detected line speed value.

[0006]

[Operation] By detecting only a signal corresponding to the line speed and determining the polarity according to the direction of rotation of the motor, the circuit configuration is simplified and the problem of polarity mismatch is avoided.

[0007]

[Embodiment] FIG. 1 is a block diagram showing an embodiment of the present invention, in which the outputs from the F/V converters 2 and 2A are directly introduced into the high signal priority detector 7, and the selection of the switches 4 and 5 is controlled by the motor. The feature is that this is carried out by the rotational direction detector 3A provided on the 9 side. That is, the high signal priority detector 7 selects the higher of the line speed signal and the motor speed signal, and the switches 4 and 5 and the inverting amplifier 6 give polarity to the output, while the selection of the switches 4 and 5 The output from the pulse generator 1A attached to the motor 9 is introduced into the rotation direction detector 3A, and the rotation direction is detected there. Note that the signals obtained via the switches 4 and 5 are used as the actual line speed value or the detected value, and the motor 9 is controlled via the inverter unit 8, as in FIG. By doing this, there is no need to detect the rotation direction for the line speed,
The circuit configuration is simplified and it is possible to avoid complicated wiring.

[0008]

[Effects of the Invention] According to the present invention, the output from the F/V converter is introduced into the high signal priority detector, the one with the larger absolute value is selected, and the Since the polarity is assigned according to the output from the rotation direction detector, there is no need to detect the rotation direction for the line speed.As a result, there is no need to consider polarity when wiring the pulse generator for line speed detection, and the pulse A single-phase pulse type generator can also be used.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the invention.

FIG. 2 is a block diagram showing a conventional example.

[Explanation of symbols]

1 Pulse generator 2 F/V converter 3 Rotation direction detector 4 Switch 5 Switch 6 Inverting amplifier 7 High signal priority detector 8 Inverter unit 9 Motor 1A pulse generator 2A F/V converter 3A　Rotation direction detector 4A switch 5A switch 6A inverting amplifier 10 Transmission 11 Winder 12 Materials

Claims (1)

[Claims] Claim 1: Detecting the line speed of the material being wound up by a winding machine and the rotational speed of an electric motor coupled to this winding machine, and usually detecting the detected line speed value or when the material is missing. is a selection output that compares the line speed detection value and the motor speed detection value, selects the one with the larger absolute value, and outputs the line speed control device that controls the motor speed based on the motor speed detection value. and a polarizing means for imparting a rotational direction polarity detected via the electric motor to the output thereof, and using the polarized speed signal as a detected line speed value. .