System for controlling motor speed

Details System for controlling motor speed System for controlling motor speed

1975-04-23

1977-04-26

Dobeck, B.

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318328, H02P 506

Patent

active

040204049

ABSTRACT:
A motor has a shaft carrying a dielectric disk on whose edge is fitted an undulating iron ring formed with a plurality of angularly equispaced points that pass beneath a magnetic detector head that generates a sinusoidal voltage signal having a frequency proportional to the rotation velocity of the shaft. This sinusoidal signal is clipped at a minimum signal level and then fed to an amplifier once it has passed through a resonant circuit tuned to a frequency corresponding to the desired motor rotation speed. The output side of this resonant circuit is connected via a capacitor and variable resistance to the input of a Schmitt trigger which operates a relay controlling the motor so as to maintain the motor speed within a desired range.

REFERENCES:
patent: 2734161 (1956-02-01), Fryklund
patent: 2828459 (1958-03-01), Pear, Jr.
patent: 3079523 (1963-02-01), Thieme
patent: 3097332 (1963-07-01), Mullin
patent: 3665276 (1972-05-01), Fujii et al.
patent: 3800188 (1974-03-01), Wilke

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