Electricity: motive power systems – Positional servo systems – Digital or numerical systems
Patent
1985-11-05
1987-12-29
Shoop, Jr., William M.
Electricity: motive power systems
Positional servo systems
Digital or numerical systems
340347AD, G05B 1929
Patent
active
047163518
ABSTRACT:
A magnetic field motor monitor comprises an analogue-to-digital converter arranged to provide digital representations of instantaneous values of a motor magnetic field to a digital processor. A source of clock pulses provides clock pulses for the processor. The source is synchronized to a cyclical external signal, e.g. line (mains), as follows. A timing pulse is generated after a fixed number of clock pulses and the frequency of the clock pulses provided by the source is controlled in dependence on the time difference between the occurrence of the timing pulse and a fixed phase of the cycle of the external signal.
REFERENCES:
patent: 3354453 (1964-11-01), Hibbits et al.
patent: 3883863 (1975-05-01), Willard
patent: 4377784 (1983-03-01), Saito et al.
patent: 4568861 (1986-02-01), Doran et al.
T. Birch et al., "Measurement of the Phase and Magnitude etc.", CPEM 74 Conference, IEE, London, Publisher, 1-5, Jul. 1974.
Bergmann Saul M.
Bonar Bray Limited
Shoop Jr. William M.
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