JPH02201222A - Driving of measuring data recorder - Google Patents

Abstract

PURPOSE:To enable recording of a data waveform in real time by driving a stepping motor at each fixed driving timing with respect to a data inputted at each period from a measuring device. CONSTITUTION:A measuring data from a measuring device 1 is outputted through a filter 2. The measuring data subjected to a filter processing is converted into a digital signal with an A/D converter 3 and inputted into a control section composed of a CPU 5, an ROM 6 and an RAM 7 to be processed for clearing. With the CPU 5, the setting of driving conditions is performed to drive a stepping motor 10 with a vibration circuit 9 along with a data processing. As a digital data is sent at each fixed time from the measuring device 1, the CPU 5 sets a driving timing at each fixed time and outputs a drive signal to a drive circuit 9 for the stepping motor 10.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a recording method for recording data measured by a material testing machine or the like.

[Prior art] Data measured by a measuring device such as a material testing machine is
It is recorded on a recording device such as a plotter. The XY plotter is
2 on paper etc. depending on the input signal, which is a digital signal.
It is a device that draws dimensional figures, and is more suitable for drawing straight lines, circles, letters, etc. than automatic balance recorders and pen oscillographs. A stepping motor is used as a drive source for a plotter because it is suitable for position control.

[Problems to be Solved by the Invention] In the stepping motor that serves as the drive source for the plotter, the winding current value and drive sequence must be determined depending on the type of motor, drive method, and rotation direction. The most troublesome problem is drive timing control. Within the low rotational range called the self-starting frequency region &i
There is no problem with the drive timing, but if you want to achieve high-speed rotation above the self-starting frequency, you will need to adopt a drive method called slow-up, which gradually speeds up the drive timing, and control the drive timing appropriately. , a misstep called step-out occurs, making highly accurate position control impossible. When reversing, even more careful timing control is required. Therefore, there is a problem in that it is difficult to draw constantly changing analog waveforms in real time using a plotter using a step motor.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for driving a measurement data recording device that can record analog waveforms in real time in a plotter using a stepping motor.

[Means for Solving the Problems] In order to solve the above problems, the present invention employs the following configuration.

That is, the method for driving a measurement data recording device according to the present invention is a method for driving a measurement data recording device such as a plotter using a stepping motor as a driving source, and is a method for driving a measurement data recording device such as a plotter using a stepping motor as a driving source. - When the number of step drives in the evening is n, the divided periods at both ends of the fixed period T are T / 2 n, and the other divided periods are T
The stepping motor is characterized in that the stepping motor is driven at each step drive timing determined as /n.

[Operation] Each time a data signal is input from a measuring device at a fixed time interval, the driving conditions of the stepping motor are determined by a simple algorithm, and reasonable driving timing control is performed. For example, in the case of 1-4 step driving, the time interval for each step is 4T3T, crystal T, 4T, stroke,! '4T,
4T)T Therefore, even in the case of waveform recording where the object to be measured changes rapidly, the stepping motor is smoothly accelerated, and the measured waveform can be drawn in real time.

Embodiment FIG. 1 is a plotter diagram showing the configuration of a measurement data recording apparatus to which a driving method according to an embodiment of the present invention is applied. Measurement data collected by a measuring device 1 such as a material testing machine is outputted via a filter 2. The filter 2 is designed to prevent the stepping motor 10 (to be described later) from losing synchronization.
This is to remove sudden changes in the measurement target. In the unimplemented example, data limited to a range of ±4 steps is provided to the plotter. Generally, the highest frequency that a recording device can follow is determined, and the characteristics of this filter determine the response characteristics of this device.

The filtered measurement data is sent to the A/D converter 3.
It is converted into a digital signal by CPU5, ROM6.
RAM? The information is input to the control unit consisting of , and the settlement process is performed. The CPU 5 processes data and also sets drive conditions for driving the stepping motor 10 by the drive circuit 9.

In order to record measured waveforms in real time based on measurement data, instantaneous drive control is a problem. Since digital data is sent to the CPU 5 from the measuring instrument at regular intervals, the CPU 5 sets drive timing and outputs a drive signal to the drive circuit 9 at regular intervals.

FIG. 2 is a diagram showing drive timings set by the CPU according to digital data input. The time interval at which data is sent is T, and the number of step drives is n.
Then, the timing during n-step driving during time T is determined as T/2n for the timing period at both ends of T, and T/n for the other periods. 0 in the same figure
The mark indicates the timing at which it starts moving one step. This drive timing is set independently for the X-axis and Y-axis of the plotter.

FIG. 3 is a diagram showing drive timing when acceleration is performed to cope with a sudden change in the object to be measured. Since preprocessing (filtering) is performed even when the object to be measured changes rapidly, step drive values are determined in the order of 1-step drive, 2-step drive, and 3-step drive. In this case, as shown in Fig. 3, the time interval for each step is
! 0.41T Upper T'1.33T12
, 3 upper ■ ζ 0.33T, upper ■ ζ 0.
29T upper T-0, 25T upper T-0, 25T, etc., and the vehicle is smoothly accelerated.

With the drive timing set in this way, the drive circuit 9
is activated, and the stepping motor 0 is driven based on other set drive conditions such as the number of phases, drive mode, number of steps, and number of rotations. Other driving conditions etc. are set and instructed to the CPU from the keyboard 14 via the Ilo 15. By driving the stepping motor IO, the pulley 11 of the plotter rotates and moves recording elements such as the print head 12.

As described above, in the driving method according to the present invention, the driving timing of the stepping motor is set at fixed time intervals when data is input for data obtained at fixed time intervals, so data waveforms can be drawn in real time. .

In addition, for example, when performing 1 to 4 step drive, there are only nine drive timings in total within a certain period of time, so the X-axis and Y-axis can be controlled independently, and the motors of both axes can be controlled independently. This enables optimal control. The control algorithm is simple as described above, can be easily controlled by a microprocessor, and does not require special hardware. The overscaling process performed by the plotter only needs to be performed once every fixed period of time, which is a much easier process than performing it at each step. In the embodiment, the drive timing is planned at short fixed time intervals, but rational acceleration/deceleration control can also be performed over a long period of time.

[Effects of the Invention] As is clear from the above description, according to the method for driving a measurement data recording device according to the present invention, data waveforms can be recorded in real time even in a recording device using a stepping motor as a driving source. Now you can.

[Brief explanation of the drawing]

Figure 1 is a diagram showing the configuration of a measurement data device to which a driving method according to an embodiment of the present invention is applied, Figure 2 is a diagram explaining drive timing settings, and Figure 3 is a diagram explaining drive timing during acceleration. This is a diagram. 1...Measuring device 9...Drive circuit 5...CPU 10-...Stepping motor patent applicant Shimadzu Corporation

Claims (1)

[Claims] (1) A method for driving a measured data recording device such as a plotter using a stepping motor as a driving source, in which the number of steps driven by the stepping motor is constant for data input from a measuring instrument every fixed period T. A method for driving a measurement data device, characterized in that a stepping motor is driven at each step drive timing determined by setting a divided period at both ends of a period T as T/2n and other divided periods as T/n.