Position pickup for numerically controlled machine tools

Details Position pickup for numerically controlled machine tools Position pickup for numerically controlled machine tools

1979-10-22

1981-05-19

Dobeck, B.

Electricity: motive power systems

Positional servo systems

With particular 'error-detecting' means

318608, 340347SY, G05R 106

Patent

active

042687861

ABSTRACT:
A position pickup for numerically controlled machine tools having a resolver which is fed on the primary side by two voltages shifted 90.degree. relative to each other and which is coupled to the moving machine part. The voltages are generated in a digital sine-cosine generator made of decimal frequency divider stages. When the secondary voltage in the resolver goes through zero, as detected by a comparator coupled thereto through a filter, the state of the generator is transferred to a memory and serves as the actual position value. To compensate for phase drift in the filter used on the secondary side, the filter is connected at fixed intervals to a reference signal derived from the primary side and changes in the measured values so obtained, and stored in the memory, used for correcting the actual position value.

REFERENCES:
patent: 3173001 (1965-03-01), Evans
patent: 4095159 (1978-06-01), Tirelli
patent: 4134106 (1979-01-01), Hungerford
patent: 4160245 (1979-07-01), Scott

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