Registers – Transfer mechanism – Traveling pawl
Patent
1974-12-05
1976-10-05
Smith, Jerry
Registers
Transfer mechanism
Traveling pawl
2351505, 340347SY, G06G 722
Patent
active
039846725
ABSTRACT:
A transducer for combining an analog signal input and a digital signal input and providing an analog signal output, equal to the sum or difference, wherein the digital input signal is divided into a first component, for which a very accurate analog equivalent is provided and a second component for which a good approximate analog equivalent is provided. The translator is usually used in conjunction with a resolver which provides analog inputs in suppressed carrier trigonometric form. The translator performs certain trigonometric manipulations on the inputs from the resolver and the analog equivalents of the digital angle in order to obtain a signal proportional to the difference between the sensor resolver position and the digital angle command position. The first component of the digital angle, for which very precise analog equivalents are provided, uses a minimum number of high precision resistors. The outputs of the resolver are obtained, with appropriate sign changes when necessary, so that a few reference signals from high precision resistors can be used to determine the analog equivalent of the digital angle in one quadrant and by combining with the resolver outputs of the appropriate sign the value of the angle can be obtained for any quadrant. By proper selection of the signs for the trigonometric inputs from the resolver some of the analog equivalents of the digital inputs can even be obtained within the selected first quadrant. For example, if the analog equivalents of digital angles of 0.degree., 18.degree., and 36.degree. are obtained, the analog value of any angle which is a multiple of 18.degree. can be obtained with the selection of the proper sign. The second digital angle is fed to a voltage dividing network which is used to provide an analog approximation for the small digital angle. A programmable read only memory is provided for controlling switching and combining of the analog inputs, which are normally in sine and cosine form, and the analog equivalents of the digital inputs. By proper selection of the translator components and of the first large predetermined digital angle and the small digital angle, which is approximated in analog form, a translator output of any desired accuracy can be obtained.
REFERENCES:
patent: 3158738 (1964-11-01), Pfeiffer
patent: 3555541 (1971-01-01), Egerton et al.
patent: 3576986 (1971-05-01), Brickner et al.
patent: 3631233 (1971-12-01), McKenna
patent: 3662162 (1972-05-01), Kallio
Control Systems Research, Inc.
Massung Howard G.
Smith Jerry
Yeager Robert D.
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