Numerical control resolver position measuring device

Details Numerical control resolver position measuring device Numerical control resolver position measuring device

1978-11-28

1980-05-20

Ruggiero, Joseph F.

Boots, shoes, and leggings

318661, 340347SY, 364603, G06F 1546, H03K 1302

Patent

active

042042577

ABSTRACT:
An absolute resolver position measuring device for a numerical control apparatus that controls a machine having a plurality of movable members. A resolver is operatively connected to each movable member such that the rotor of each resolver rotates as the corresponding member moves. The resolver position measuring device includes a real time counter that provides a multi-digit data word that is cyclically redundant. A first PROM is addressed by the real time counter and provides a sequence of digital data words which represent a sine waveform; and a second PROM is addressed by the real time counter and provides a sequence of digital data words which represent a cosine waveform. A first digital to analog converter is responsive to the first PROM to provide a sine wave to the first stator winding of each resolver, and a second digital to analog converter is responsive to the second PROM to provide a cosine wave to the second stator winding of each resolver. The waveform induced in each resolver rotor is input to a zero crossing detector and the outputs of the zero crossing detectors are multiplexed in a sequential order onto a single conductor. This multiplexed signal is used to store the current count of the real time counter a plurality of times such that the stored counts represent the phase angles between the corresponding resolver stator windings and rotors.

REFERENCES:
patent: 3078400 (1963-02-01), Kilroy et al.
patent: 3634838 (1972-01-01), Granquist
patent: 3673585 (1972-06-01), Tripp et al.
patent: 3676650 (1972-07-01), Henegar
patent: 3701888 (1972-10-01), McDaniel
patent: 3866212 (1975-02-01), Simon et al.
patent: 3878535 (1975-04-01), Twiss
patent: 3918045 (1975-11-01), Morser et al.
patent: 4010463 (1977-03-01), Kay

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