Browse Prior Art Database

Direct Current Motor Drive

IP.com Disclosure Number: IPCOM000097360D
Original Publication Date: 1962-Oct-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 57K

Publishing Venue

IBM

Related People

Saxild, OL: AUTHOR

Abstract

The sampled data network is for driving a D. C. motor in accordance with the amplitude of a varying D. C. input signal. A minimum of power is required in energizing the motor and high response to an input signal is obtained.

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Direct Current Motor Drive

The sampled data network is for driving a D. C. motor in accordance with the amplitude of a varying D. C. input signal. A minimum of power is required in energizing the motor and high response to an input signal is obtained.

A varying D. C. input signal is applied via input terminal 10 to a pair of variable time-base encoders 11 and 12. Encoders 11 and 12 receive the complemented outputs of reference multivibrator 13. Encoder 11 is associated with positive input signals. Encoder 12 responds to negative D. C. input signals. Encoders 11 and 12 sample the D. C. input signal at a rate determined by multivibrator 13 and generate a sweep or ramp function during the sample time. The ramp has a slope that is proportional to the magnitude of the sample.

The outputs of encoders 11 and 12 are applied to threshold triggers 14 and 15, respectively. Each trigger comprises a unijunction or double base transistor 16 whose bases are connected in series with one output of multivibrator 13 and the primary of a peaking transformer T1P or T2P. The unijunction transistor is rendered conductive after a predetermined threshold voltage is exceeded. Conduction of transistor 16 of trigger 14 causes a pulse in the peaking transformer secondaries T1S1 and T1S2. Thus, silicon controlled rectifiers 18 and 19 are rendered conductive to energize motor 20 in one direction. Motor 20 is energized in the opposite direction by conduction of silicon controlled rectifiers 22...