Motor control system

Abstract

A motor control system capable of outputting motor control data contained in a numeric control device and inputting motor control data to the numeric control device as required, without using a proprietary connector and/or a switching unit. The control system has a numeric control device, a plurality of motor amplifiers for receiving a command from the numeric control device via a serial communication line, a plurality of motors such as servomotors each driven by each of the plurality of motor amplifiers, and a data I/O device for inputting and outputting motor control data, as analog data or digital data, included in software in the numeric control device. The data I/O device may also transmit motor control data, to the numeric control device, as analog or digital data.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other objects, features and advantages of the present invention will be made more apparent by the following description of the preferred embodiments thereof, with reference to the accompanying drawings, wherein:

FIG. 1 shows a schematic configuration of a motor control system according to the present invention;

FIGS. 2 a to 2c are views explaining a first embodiment of the invention for adjusting backlash acceleration, indicating states in which a parameter adjustment is unnecessary, underestimated and overestimated, respectively;

FIG. 3 shows a schematic view of a belt conveyor as a second embodiment of the invention;

FIG. 4 is a graph indicating a change of the conveying speed of a print board by the belt conveyor of FIG. 3, corresponding to the positions in the conveying direction of the belt conveyor; and

FIG. 5 shows a schematic view of a rotary indexing device as a third embodiment of the invention.

Claims

1. A motor control system comprising: a numeric control device;a plurality of motor amplifiers for receiving a command from the numeric control device via a serial communication line;a plurality of motors each driven by each of the plurality of motor amplifiers; anda data input/output device for inputting and outputting control data for the plurality of motors,wherein the data input/output device is configured to input and output the control data in the numeric control device via the serial communication line.

2. The motor control system as set forth in claim 1, wherein the control data for the plurality of motors in the numeric control device outputted from the data input/output device includes at least one of a speed command, a torque command and the speed and the position of the motor.

3. The motor control system as set forth in claim 1, wherein the motors are servomotors and the servomotors are adjusted by the control data for the plurality of motors in the numeric control device outputted from the data input/output device.

4. The motor control system as set forth in claim 1, wherein the data input/output device is configured to input control data for the plurality of motors to the numeric control device via the serial communication line.

5. The motor control system as set forth in claim 4, wherein the motors are servomotors and the servomotors are adjusted by the control data for the plurality of motors inputted to the numeric control device from the data input/output device.

6. The motor control system as set forth in claim 1, further comprising a sensor for measuring the motions of components driven by the motors and a data processing device for comparing detected data by the sensor with the data outputted from the data input/output device in relation to factors including timing.

7. The motor control system as set forth in claim 1, wherein the data input/output device is configured to switch, at an arbitrary timing, which control data for the motors is used.

8. The motor control system as set forth in claim 1, further comprising a data processing device for receiving data indicating motor loads of the motors outputted from the data input/output device and for transmitting a signal for reducing the motor loads to the data input/output device based on the data indicating the motor loads.

9. The motor control system as set forth in claim 1, wherein the data input/output device is connected to the serial communication line such that the data input/output device may be connected to and separated from the serial communication line in a hot plug state.

10. The motor control system as set forth in claim 1, wherein the data input/output device is structurally integrated with the numeric control device or the motor amplifier.

11. The motor control system as set forth in claim 1, wherein the data input/output device is connected to a serial communication line which connects the numeric control device and the motor amplifiers such that a synchronized operation may be carried out, whereby a data input/output operation may also be operated in synchronization with the synchronized operation.