Servo apparatus with electrical motion limiting

Electricity: motive power systems – Positional servo systems – Limit or end-stop control

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318663, 318468, G05G 500

Patent

active

042504414

ABSTRACT:
The servo apparatus includes a series resistor string connected in parallel with the body of the servo slidewire resistor. Upscale and downscale travel limit voltage points, corresponding to upscale and downscale travel limit positions for the slidewire contact, are established along the resistor string. The limit voltages on the limit voltage points are separately compared with the slidewire contact voltage, and appropriate motor drive signal interrupting signals are produced when the slidewire contact voltage exceeds the upscale limit voltage or drops below the downscale limit voltage. The interrupting signals effect their motor drive signal interrupting action by reversing the output polarity of motor drive comparators which produce the motor drive signals under the control of an error amplifier which compares the apparatus input voltage to the slidewire contact voltage.

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