Position monitor for a stepper motor

Details Position monitor for a stepper motor Position monitor for a stepper motor

1989-11-21

1991-04-09

Shoop, Jr., William M.

Electricity: motive power systems

Open-loop stepping motor control systems

318685, 364173, 123440, H02P 800

Patent

active

050067729

ABSTRACT:
A position monitor is provided for use in conjunction with a stepper motor wherein two imputs are provided to the monitor from the stepper motor phase windings. A first signal is provided which indicates, by pulses, the rising and falling edges of in the magnitudes of both phase winding signals. A second signal is provided to indicate the direction of rotation of the stepper motor. The first and second signals are used as inputs to a plurality of counters which maintain a digital value representing the position of the stepper rotor. The digital value is converted to an analog value and amplified for use as a signal representing, by its magnitude, the precise position of the rotor of the stepper motor. The monitor therefore maintains a digital value and outputs a voltage signal which represent the position of a stepper motor rotor as it rotates through a plurality of clockwise and/or counter-clockwise revolutions.

REFERENCES:
patent: 4144804 (1979-03-01), O'Keefe
patent: 4380985 (1983-04-01), Otsuka et al.

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