Electricity: motive power systems – Positional servo systems – With particular 'error-detecting' means
Patent
1988-03-18
1989-06-06
Dobeck, Benjamin
Electricity: motive power systems
Positional servo systems
With particular 'error-detecting' means
324166, G05B 106
Patent
active
048374920
ABSTRACT:
To the primary winding of a synchronous electric machine, a polyphase a.c. excitation signal from an excitation circuit is applied. Thus, an induced voltage signal, the phase of which varies by an angle proportional to a rotational position of a rotary body, is produced on the secondary winding of the synchro. A phase difference produced between the a.c. excitation signal and the induced voltage signal is detected by a phase difference detecting circuit. This phase difference detecting circuit detects not only a phase difference itself, but also detects the time at which the phase difference has been detected. On the basis of the phase difference and the time thus detected, a predictive computation circuit predicts a rotational position of the rotary body at an arbitrary time. In addition, a rate multiplier circuit for setting a value corresponding to a change in a predicted rotational position and an up/down counter circuit for counting the output thereof are further added, thereby making it possible to provide the output of the up/down counter circuit as a rotational position.
REFERENCES:
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patent: 4611269 (1986-09-01), Suzuki et al.
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Patent Abstracts of Japan, vol. 10, No. 330 (p. 514) (2386), 11th Nov. 1986, p. 112, p. 514--JP-A-61 137 010.
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Patent Abstracts of Japan, vol. 10, No. 173 (p. 469) (2229), 18th Jan. 1986--JP-A-61 23 916.
Kawata Kouzou
Kurosawa Ryoichi
Dobeck Benjamin
Kabushiki Kaisha Toshiba
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