Communications: electrical – Continuously variable indicating – With particular transmitter
Patent
1993-11-04
1996-04-16
Peng, John K.
Communications: electrical
Continuously variable indicating
With particular transmitter
34087037, 324658, 324691, G08C 1500
Patent
active
055086969
ABSTRACT:
A rotational position-detecting device detects the rotational position of various kinds of rotating shafts in an accurate and simplified manner. A parameter element is mounted on a rotating shaft of a motor or the like for providing a parameter which varies in a manner corresponding to the rotational position of the rotating shaft. The parameter element may be formed by a variable resistor a resistance of which varies in a manner corresponding to the rotational position of the rotating shaft, or alternatively by a variable capacitor a capacitance of which varies in a manner corresponding to same. An oscillator generates a signal having a frequency dependent on the resistance or capacitance of the parameter element. The oscillator may be formed by a VCO to which is applied voltage dependent on the resistance of the parameter element, to generate a signal having a frequency dependent on the applied voltage. Alternatively, the oscillator may be formed by an LC resonance circuit which generates a signal having a frequency dependent on the capacitance of the parameter element. The oscillating frequency of the oscillator bears one-to-one correspondence to the rotational position of the rotating shaft, and hence the latter is detected based on the former.
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Fujitsu Limited
Peng John K.
Wu Daniel J.
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