Electrical pulse counters – pulse dividers – or shift registers: c – Applications – Position determining
Patent
1996-09-10
1998-08-11
Wambach, Margaret Rose
Electrical pulse counters, pulse dividers, or shift registers: c
Applications
Position determining
G01M 300
Patent
active
057938342
ABSTRACT:
A method for detecting the position of a linear stepping motor which includes the steps of generating a reference clock signal for detecting the position of the linear stepping motor using an oscillator and counting the reference clock signal with a counter, generating digital values of carrier sine waves sin.omega.t and cos.omega.t by inputting the output of the counter to a ROM having sine and cosine functions, converting the digital values of the carrier sine waves sin.omega.t and cos.omega.t to analog sine wave signals sin.omega.t and cos.omega.t using a digital-to-analog converter and outputting the result, generating the signals sin.omega.tcos.theta. and cos.omega.tsin.theta. by multiplying the analog sine wave signals sin.omega.t and cos.omega.t by sine wave signals sin.theta. and cos.theta. from a linear scale in a multiplier, adding the signals sin.omega.tcos.theta. and cos.omega.tsin.theta. in an adder to form a modulated signal sin(.omega.t+.theta.), converting the a modulated signal sin(.omega.t+.theta.) to a predetermined square wave signal in a comparator so as to be synchronized with the counter, and detecting the phase difference between the square wave signal from the comparator and the sine wave signal sin.omega.t to detect the position of the linear stepping motor. The reference sine wave and square wave signals are compared twice in one period and the displacement of the linear stepping motor is detected in real time by being synchronized with the reference sine wave.
REFERENCES:
patent: 5317614 (1994-05-01), Davis et al.
patent: 5425073 (1995-06-01), Bitzer et al.
Samsung Aerospace Industries Ltd.
Wambach Margaret Rose
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