Stepping motor drive control circuit

Details Stepping motor drive control circuit Stepping motor drive control circuit

1999-10-19

2001-11-27

Nappi, Robert E. (Department: 2837)

Electricity: motive power systems

Open-loop stepping motor control systems

C318S695000

Reexamination Certificate

active

06323617

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a stepping motor, drive-control circuit preferably used as, for example, an image reading motor for a facsimile or the like.
2. Related Background Art
In a facsimile sheet conveying system and the like, a stepping motor has been generally used. As the driving systems for the stepping motor, a constant-current driving system and a constant-voltage driving system are used. For driving at a relatively low speed, a constant-voltage driving operation is often performed using a four-phase unipolar stepping motor in which the driving circuit can be simplified.
However, when a general four-phase unipolar stepping motor is used, current flows through all of the four-phase coils under the worst conditions so that equipment may be damaged by the excess increase of the temperature of the motor. The addition of a protective circuit for breaking current or the like with a thermal fuse is considered to prevent the damage during a software runaway malfunction. However, a cost increase is caused by the addition of the protective circuit, for example, in a protective circuit using the thermal fuse, and an exchange of a part was required for regeneration during a circuit operation.
Further, a problem occurs that when the motor is driven by the same driving force in low speed driving as that in high speed driving, the excessively large driving force results in a greater conveyance noise.
SUMMARY OF THE INVENTION
An object of the present invention was made in consideration of the above-mentioned facts and is to provide a low noise, stepping-motor, drive-control circuit by repeating on- and off-switching of a phase signal in response to the stepping motor speed.
Another object of the present invention is to generate a phase signal so that no pair of phases of a stepping motor are driven at the same time.
Still another object of the present invention will become apparent from the concrete examples described later.


REFERENCES:
patent: 3986094 (1976-10-01), Quioque et al.
patent: 4609857 (1986-09-01), Ishii
patent: 5061888 (1991-10-01), Hiraoka
patent: 5075609 (1991-12-01), Ito et al.

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