Production Line Automation via Servo Motor

The theory behind this hack is to make the servo think that the output shaft is always at the 90 degree mark. This is done by removing the feedback sensor, and replacing it with an equivalent circuit that creates the same readings as the sensor being at 90 degrees. Thus, giving it the signal for 0 degrees will cause the motor to turn on full speed in one direction. The signal for 180 degrees will cause the motor to go the other direction. Since the feedback from the output shaft is disconnected, the servo will continue in the appropriate direction as long as the signal remains.

The result of this is a really nice compact gearhead motor with built in electronics. The interface to this motor unit is a 1 wire control line, +5 volts for power, and a ground. All of this for around £10

As for the details, there are actually only two modifications to make to the servo.

1. Replace the position sensing potentiometer with an equivalent resistor network
2. Remove the mechanical stop from the output shaft

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Thank you and good night

hi, exactly what do you want the servo to do? servo motors are usually hooked up to a driver (usually same matched to the servo motor), and depending on this driver and your PLC, you can control the servo.

I'm responding to the basic question, yes, you can control a servo. I came up with the basic PLC spec using google.

http://pewa.panasonic.com/acsd/motion-control/products/fpg.php

There are Panasonic options available to use their servo's, or you could get the communication option for the PLC and talk to a smart digital servo drive/motion control. I've had some success with Copley (www.copleycontrols.com) Elmo (www.elmomc.com), and Galil (www.galilmc.com) using RS232/ASCII.

Good luck