Drive device for stepper motor and indicating apparatus...

Details Drive device for stepper motor and indicating apparatus... Drive device for stepper motor and indicating apparatus...

2006-10-31

2006-10-31

Ip, Paul (Department: 2837)

Electricity: motive power systems

Positional servo systems

With particular motor control system responsive to the...

C318S587000, C318S696000

Reexamination Certificate

active

07129670

ABSTRACT:
A drive device includes stepper motors, each having an excitation coil and a rotor rotating based on variation in the excitation state of the excitation coil; driven members, each moving in accordance with the rotation of the rotor of the corresponding stepper motor; stoppers, each stopping the driven member mechanically at a zero position; and a controller, controlling the respective stepper motors so as to selectively performs either a normal operation in which the stepper motor is driven so as to rotate, or a zero-position detection operation in which the stepper motor is driven so that the driven member is moved to the stopper. The controller starts to perform the zero-position detection operation simultaneously in all of the stepper motors and changes the stepper motor which has terminated the zero-position detection operation to the normal operation without waiting for the termination of the zero-position detection operation in other stepper motors.

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patent: 2001-327193 (2001-01-01), None

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