System and method for reducing oscillation of a stepper motor

Details System and method for reducing oscillation of a stepper motor System and method for reducing oscillation of a stepper motor

1991-05-30

1993-11-16

Shoop, Jr., William M.

Electricity: motive power systems

Positional servo systems

With particular motor control system responsive to the...

318696, G05B 1940

Patent

active

052627080

ABSTRACT:
A system and method are disclosed for reducing oscillation of a stepper motor. In one embodiment, the system includes an oscillation indicator circuit that is connectable to a stepper motor unit having a stepper motor and a stepper controller with a manually adjustable potentiometer, the stepper motor being responsive to varying resistances of the potentiometer. The oscillation indicator includes a detector circuit, and a latch/LED (light emitting diode) display circuit. The oscillation indicator provides an oscillation-indication signal and a LED display as an indication (representation) of oscillation of the motor during execution of a step, the indication representing a back EMF (electromotive force) of the motor. Upon viewing the indication, a user manually adjusts the potentiometer to reduce the indication and the oscillation. In another embodiment, where the potentiometer is processor-adjustable, the system also includes a microprocessor coupled to the potentiometer of the stepper controller and to the oscillation indicator, and responsive to the oscillation-indication signal for automatically adjusting the potentiometer to reduce the oscillation. In both embodiments, the method employed by the system includes (a) producing an indication of the oscillation of the motor, the indication being representative of a back EMF of the motor, and (b) adjusting the potentiometer to a selected resistance level for reducing the back EMF indication and, hence, the oscillation.

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"How We Made Sense Out of the Sensorless Motor", Micro Linear, Electronic Design Magazine, Jul. 12, 1990. NOTE: This article was published after Applicant's date of invention.

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