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Shaft Positioning Integrator

IP.com Disclosure Number: IPCOM000097701D
Original Publication Date: 1961-Apr-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Orrange, RJ: AUTHOR

Abstract

The integration method is basically a combination of a motor generator type integrator and a position servo. The output shaft moves in discrete steps, under direction of a clutch which is controlled by a pulse generator. The output shaft of the MG never turns beyond a predetermined position, determined by the amplitude of the input voltage and the pulse width of the frequency control it returns to neutral at the end of each sample time. Accuracy is limited ultimately by the linearity of the position servo feedback potentiometer and the accuracy of the frequency standard used for generating the timing pulses.

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Shaft Positioning Integrator

The integration method is basically a combination of a motor generator type integrator and a position servo. The output shaft moves in discrete steps, under direction of a clutch which is controlled by a pulse generator. The output shaft of the MG never turns beyond a predetermined position, determined by the amplitude of the input voltage and the pulse width of the frequency control it returns to neutral at the end of each sample time. Accuracy is limited ultimately by the linearity of the position servo feedback potentiometer and the accuracy of the frequency standard used for generating the timing pulses.

With an input Vin at T = 0, the shaft of the position servo turns through some angle that is proportional to Vin. This shaft position is transmitted through the clutch C1 to the output shaft. At time T1, relay K1 is energized by the pulse generator, in turn energizing clutch coil C1 and relay K2. The input to the servo amplifier is grounded and the shaft returns to its neutral position. However, this shaft rotation is transmitted through the other side of the clutch, and reversed through the differential, so that it is added to the previous shaft position. At the end of delta T2, or at time T2, relay K1 drops out, de-energizing the clutch coil C1 and relay K2, thus allowing the shaft to assume a new position according to Vin. This cyclic process continues at a constant sampling rate, such that the position of the output shaft repr...