JP2010277163A - Servo system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a servo system suitable for a packaging machine etc. <P>SOLUTION: The servo system includes an upper-level controller 10, a servo control device 40 and a servo motor 30. The servo control device 40 includes: a pulse input unit 40c and a pulse integration processing unit 40d for integration-calculating pulse train signals which are externally input; and a latch processing unit 40e or the like for latching the pulse integration value the integration-calculated each time an external latch (retention) signal is input. By a proper adjustment of a reference axis speed to control the line speed of a process object of the packaging machine, packaging and cutting at a reference position are performed. In the servo control device 40, the pulse input unit 40c and the pulse integration processing unit 40d are formed by applying thereto a serial data processing function in the conventional servo control device, with the addition of the latch processing unit 40e and a changeover switch unit 40f only. Therefore, the servo system suitable for the packaging machine can be manufactured with a slight cost increase. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention is formed by a host controller, a servo control device, and a servo motor. Based on a command transmitted from the host controller, the servo motor is caused to perform variable speed operation via the servo control device. The present invention relates to a servo system that adjusts a mechanical device or the like using a servo motor as a drive source to a desired operation state.

  FIG. 3 is a circuit configuration diagram showing a conventional example of this type of servo system.

  This servo system is formed of a host controller 10, a servo control device 20, and a servo motor 30, for example, for a mechanical device using a servo motor 30 as a drive source as a command transmitted from a processing unit 10a forming the host controller 10. Positioning data is received by the communication data transmitting / receiving unit 20a forming the servo control device 20, and based on the received positioning data, the servo motor 30 via the motor control unit 20b forming the servo control device 20 performs variable speed control. By performing the operation, positioning control of the mechanical device is performed.

  When this type of servo system is used in a packaging machine, at least two systems are used: a servo system for a reference axis that controls the line speed of a workpiece and a servo system for an axis for packaging / cutting. Both servo systems Need to operate synchronously.

  However, in simple synchronous operation, errors due to expansion and contraction of the workpiece may accumulate, and as a means for correcting this error accumulation, integration is performed by integrating the pulses output from the encoder attached to the reference shaft. While monitoring the deviation between the pulse data and the reference position marked on the packaging / cutting part of the workpiece, the speed of the reference axis is adjusted as appropriate so as to perform packaging / cutting at the reference position.

  In a servo system used in a conventional packaging machine, for example, all of the above-described correcting means are installed in the host controller while using the circuit described in Patent Document 1 below.

JP 2002-1116058 (paragraph 0006 and the like)

  However, the conventional host controller is usually not equipped with the above-described correcting means, and it is not possible to install this correcting means in the host controller. The controller has the disadvantage of being expensive.

  An object of the present invention is to provide a servo system capable of solving the above problems.

The first invention is composed of a host controller, a servo control device, and a servo motor. Based on a command transmitted from the host controller, the servo motor is caused to perform variable speed operation via the servo control device. In a servo system that adjusts a mechanical device using this servo motor as a drive source to a desired operating state,
The servo control device integrates a pulse train signal input from the outside, a means for latching the integrated calculation value every time an external latch signal is input, and the latched value as the higher order A means for transmitting to the controller is added.

According to a second aspect of the invention, in the servo system,
The servo control device integrates a pulse train signal input from the outside, a means for latching the integrated calculation value every time an external latch signal is input, the latched value or the integration Means for selecting and outputting any one of the calculated values and means for transmitting the selected value to the host controller are added.

  In the conventional servo system of this type, since the positioning data described above includes a parallel data format and a serial data format, the conventional servo control device is intended for generalization and standardization of components. It was made by paying attention to the fact that it is generally manufactured so as to be compatible with both of the above data formats.

  That is, by using the serial data processing function of the conventional servo control device as the means for correcting the packaging machine described above, the servo system of this packaging machine can be manufactured with a slight increase in price for the addition of the insufficient function. Can do.

Servo system circuit configuration diagram showing an embodiment of the present invention Waveform diagram explaining the operation of FIG. Circuit diagram of conventional servo system

  FIG. 1 is a circuit configuration diagram of a servo system showing an embodiment of the present invention. Means for correcting the accumulation of errors due to the expansion and contraction of the workpiece described above when this type of servo system is used in a packaging machine. Is shown in the circuit configuration when installed in the servo controller.

  This servo system is formed of a host controller 10, a servo controller 40, and a servo motor 30, and is applied to a packaging machine that uses the servo motor 30 as a drive source as a command signal transmitted from a processing unit 10a that forms the host controller 10. The positioning command value in the parallel data format is received by the communication data transmitting / receiving unit 40a forming the servo control device 40.

  Based on the received positioning command value as a command signal, driving power is supplied to the servomotor 30 via the motor control unit 40b forming the servo control device 40, and the servomotor 30 is controlled at a variable speed based on this driving power. While performing the control operation, the speed / position signal of the servo motor 30 is transmitted to the motor control unit 40b.

  The motor control unit 40b performs positioning control of the packaging machine based on the speed / position signal and the positioning command value, and the current position as the machine status signal is transmitted via the communication data transmission / reception unit 40a. To the processing unit 10a.

  Further, the servo control device 40 has a pulse input unit 40c and a pulse integration processing unit 40d for integrating and calculating a pulse train signal input from the outside, and a latch (holding) signal from the integrated and calculated pulse integrated value. The latch processing unit 40e that latches each time is input, and either the latched accumulated pulse data or the pulse accumulated value is determined based on a latch process valid / invalid selection signal that is commanded according to the application. The selector switch unit 40f that selects and outputs the selected value is transmitted to the host controller 10 via the communication data transmitting / receiving unit 40a.

  FIG. 2 is a waveform diagram for explaining the operation of the packaging machine using the servo system formed by the host controller 10, the servo control device 40, and the servo motor 30.

  As shown in FIG. 2, the pulse train signal output from the encoder attached to the reference axis of the packaging machine is converted into a pulse integration value by a pulse input unit 40c and a pulse integration processing unit 40d, and a latch processing valid / invalid selection signal. When the latch signal based on the reference position marked on the wrapping / cutting part of the workpiece changes from the OFF state to the ON state, the pulse integrated value at this timing is latched by the latch processing unit 40e. Converted to accumulated pulse data.

  In the processing unit 10a of the host controller 10 that has received the integrated pulse data, the communication data transmission / reception unit 40a and the motor control unit 40b of the servo control device 40 are connected in order to correct the accumulation of errors caused by the expansion / contraction of the workpiece. Thus, packaging / cutting at the reference position is performed by appropriately adjusting the speed of the servo motor 30 that drives the reference shaft.

  In the servo control device 40, the pulse input unit 40c and the pulse integration processing unit 40d divert the latch processing unit 40e and the changeover switch unit 40f by diverting the serial data processing function in the conventional servo control device. Since it can be formed simply by adding, a servo system suitable for this packaging machine can be manufactured with a slight increase in price.

  DESCRIPTION OF SYMBOLS 10 ... High-order controller, 10a ... Processing part, 20 ... Servo control device, 20a ... Communication data transmission / reception part, 20b ... Motor control part, 30 ... Servo motor, 40 ... Servo control device, 40a ... Communication data transmission / reception part, 40b ... Motor Control unit, 40c, pulse input unit, 40d, pulse integration processing unit, 40e, latch processing unit, 40f, changeover switch unit.

Claims (2)

This servo motor is formed by a host controller, a servo controller, and a servo motor. The servo motor is driven by a variable speed operation via the servo controller based on a command transmitted from the host controller. In a servo system that adjusts the mechanical device as a source to a desired operating state,
The servo control device integrates a pulse train signal input from the outside, a means for latching the integrated calculation value every time an external latch signal is input, and the latched value as the higher order A servo system characterized in that a means for transmitting to a controller is added. This servo motor is formed by a host controller, a servo controller, and a servo motor. The servo motor is driven by a variable speed operation via the servo controller based on a command transmitted from the host controller. In a servo system that adjusts the mechanical device as a source to a desired operating state,
The servo control device integrates a pulse train signal input from the outside, a means for latching the integrated calculation value every time an external latch signal is input, the latched value or the integration A servo system comprising: means for selecting and outputting any of the calculated values; and means for transmitting the selected value to the host controller.

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