Electricity: electrical systems and devices – Electrical speed signal processing systems
Patent
1977-07-25
1978-09-19
Goldberg, Gerald
Electricity: electrical systems and devices
Electrical speed signal processing systems
307260, H02P 500
Patent
active
041158318
ABSTRACT:
A velocity detecting apparatus comprises a waveform shaping circuit including a first stage switching transistor connected in a rotational speed control loop for a rotary machine, for amplifying and shaping an A.C. signal derived from a velocity sensor and being operated between a saturation region and an active region, a waveform transform circuit having a stable state and a quasi-stable state for a given period after the application of an input signal, for transforming an output signal of the waveform shaping circuit to a square wave having a given duration, an integration circuit for integrating the square wave with time to produce an integrated output, and a comparator for comparing the output voltage of the integration circuit with a reference voltage. In this velocity detecting apparatus, the beginning of the quasi-stable state of the waveform transform circuit is established by the beginning of the active region of the first stage switching transistor of the waveform shaping circuit, and the integration circuit includes first and second series-connected resistors arranged to voltage divide the square wave. One end of an integrating capacitor is connected to the junction of the first and second resistors while the resistances of the first and second resistors are selected such that a duty factor of the square wave during constant velocity control lies between approximately 4/5 and 1/1.
REFERENCES:
patent: 3230437 (1966-01-01), Cappello
patent: 3657601 (1972-04-01), Darrow
patent: 3952829 (1976-04-01), Gray
Goldberg Gerald
Matsushita Electric - Industrial Co., Ltd.
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