JPH01268494A - Driver for stepping motor - Google Patents

Abstract

PURPOSE:To eliminate a hunting or an abnormal sound even if the interval of input stepping pulses is varied by switching the generating timing of a second step in response to the variation in the output of a stepping pulse interval detector. CONSTITUTION:A stepping pulse interval detector 5 detects the signal interval of stepping pulse signals to be input. A second pulse switching circuit 6 controls the timing of generating a pulse of second step of a pulse train generator 2 in response to the output of the detector 5. That is, the generator 2 generates a second pulse at a normal timing at the interval within a predetermined range, and when stepping pulse signals are input at a short interval, second pulse is generated at a fast timing, while when the signals are input at a long interval, the second pulse is generated at a slow timing.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a driving device for a stepping motor used in a flexible disk device or the like.

[Prior Art] FIG. 2 is a block diagram showing a stepping motor drive device of a conventional flexible disk device. In FIG. 0, (1) is a step pulse signal input terminal, (2) is a pulse train generation circuit, and (3) ) is a stepping motor drive circuit, and (4) is a stepping motor.

Next, the operation will be explained. When one step pulse signal is input to the pulse train generation circuit (2) through the step pulse signal input terminal (1), the pulse train generation circuit (2)
generates the first step signal in synchronization with the step pulse signal, and generates the second step signal after a certain period of time. The stepping motor drive circuit (3) is a pulse train generation circuit (
2) Amplify the output.

A stepping motor (4) is driven in two steps using one step pulse signal. When step pulse signals are continuously input, similar operations are repeated, and the stepping motor (4) is driven with twice the number of steps as the number of input step pulse signals.

[Problems to be Solved by the Invention] The conventional stepping motor drive device is configured as described above, and the second step generation timing with respect to the first step pulse signal is constant.

When step pulse signals are input continuously, if the step pulse signal interval changes, the pulse generation timing of the pulse train generation circuit becomes unbalanced, causing problems such as causing disturbances in the stepping motor and generation of abnormal noise.

This invention was made to solve the above-mentioned problems, and provides a stepping motor drive device in which the stepping motor does not become out of order or generate abnormal noise even if the input step pulse signal interval changes. The purpose is to

[Means for Solving the Problems] A stepping motor drive device according to the present invention detects the signal interval of continuously inputted step pulse signals, and when the signal interval changes beyond a predetermined range, the output signal changes. The second pulse switching circuit is provided with a step pulse interval detection circuit for detecting the step pulse interval, and a second pulse switching circuit for switching the generation timing of the second step of the pulse train generation circuit in accordance with a change in the output of the step pulse interval detection circuit.

[Work] The stepping motor drive device in this invention is:

The second step generation timing of the pulse train generation circuit is
The timing of the pulses applied to the stepping motor is balanced because the step pulse signal is switched so that the signal interval becomes faster when it becomes smaller than a certain signal interval and becomes slower when it becomes larger than a certain signal interval.

[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1st
The figure is a block diagram showing an embodiment of the present invention. In the figure, (1) is a step pulse signal input terminal, (2) is a pulse train generation circuit, (3) is a stepping motor drive circuit, and (4) is a stepping motor drive circuit. The motor (5) detects the signal interval of step pulse signals that are continuously input to the step pulse signal input terminal (1), and when this signal interval changes beyond a predetermined range, the step pulse interval at which the output signal changes. The detection circuit (6) is the step pulse interval detection circuit (
This is a second pulse switching circuit that switches the generation timing of the second step of the pulse train generation circuit (2) according to the output change of step 5).

Next, its operation will be explained. When a step pulse signal is continuously input through the step pulse signal input terminal (1), the pulse train generation circuit (2) generates a first step pulse in synchronization with the step pulse signal. The step pulse interval detection circuit (5) detects the signal interval of the input step pulse signal, and the signal interval is different depending on whether it is within a predetermined range, shorter than the predetermined range, or longer than the predetermined range. Output a signal. The second pulse switching circuit (6) controls the timing of second step pulse generation of the pulse train generating circuit (2) in accordance with the output of the step pulse interval detecting circuit (5). That is, when step pulse signals are input at intervals within a predetermined range, the pulse train generation circuit (2) generates the second pulse at the normal timing,
When step pulse signals are input at short intervals, the pulse train generation circuit (2) generates the second pulse at a fast timing, and when step pulse signals are input at long intervals, the pulse train generation circuit (2) generates the second pulse at a slow timing. The second pulse is generated. The stepping motor drive circuit (3) amplifies the output of the pulse train generation circuit (2) and drives the stepping motor (
4) is driven in two steps with one stepping pulse signal.

[Effects of the Invention] As described above, according to the present invention, the signal interval of continuously input step pulse signals is detected, and when the signal interval changes beyond a predetermined range, the step pulse interval at which the output signal changes is detected. Since we have provided a detection circuit and a second pulse switching circuit that switches the generation timing of the second step of the pulse train generation circuit according to changes in the output of this step pulse interval detection circuit, the stepping motor will not operate even if the input step pulse signal interval changes. This has the effect of providing high performance without causing disturbance or abnormal noise.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG.
The figure is a block diagram showing a conventional stepping motor drive device. In the figure, (1) is a step pulse signal input terminal, (
2) is a pulse train generation circuit, (3) is a stepping motor drive device, (4) is a stepping motor, (5) is a step pulse interval detection circuit, and (6) is a second pulse switching circuit. The same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] In a stepping motor drive device equipped with a pulse train generation circuit that generates a pulse train for two steps with one input step pulse signal and applies it to the stepping motor drive circuit, the signal interval of the step pulse signals that are input continuously is a step pulse interval detection circuit whose output signal changes when the signal interval changes beyond a predetermined range; and a second step generation timing of the pulse train generation circuit according to the change in the output of the step pulse interval detection circuit. A stepping motor drive device comprising a second pulse switching circuit for switching.