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Automatic High Speed Starting of Position Servo

IP.com Disclosure Number: IPCOM000093212D
Original Publication Date: 1967-Jul-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Wilford, CR: AUTHOR [+2]

Abstract

The fast-acting servo system operates to position an object at any position along a 360 degree circle. Resolver 10 provides the sine of the position error. Addressing circuit 11 supplies signals of appropriate amplitudes to stators 12 and 13 of resolver 10 to locate the desired position.

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Automatic High Speed Starting of Position Servo

The fast-acting servo system operates to position an object at any position along a 360 degree circle. Resolver 10 provides the sine of the position error. Addressing circuit 11 supplies signals of appropriate amplitudes to stators 12 and 13 of resolver 10 to locate the desired position.

Rotor winding 14 is attached to the object to be positioned. Between +90 degrees and -90 degrees away from the desired position, winding 14 provides an output carrier signal. The latter's amplitude is a function of sine 15 of the angular position error. This signal passes through phase sensitive demodulator 16 whose output is summed with the error rate from tachometer 17 to linearly control a valve in hydraulic actuator 18. Thus, within a position error of +90 degrees and -90 degrees, the object is positioned in a linear mode.

Quadrature rotor winding 19, which has an output whose amplitude is a function of cosine 20 of the angular position error, is used to detect when the position error is +/- 90 degrees to +/- 180 degrees. Synchronous demodulation of the winding 19 output yields an output when the above condition exists. This detection operates Schmitt trigger 21 which enables regenerative switch 22. The latter senses the polarity of position error signal 15 and supplies full power to actuator 18 in the proper direction. As the 90 degrees mark is passed, the quadrature winding output 20 goes positive, turning off trigger 21 and d...