Field weakening sensor circuit

Details Field weakening sensor circuit Field weakening sensor circuit

1975-09-05

1977-07-12

Schaffer, Robert K.

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318356, 318317, 318251, 318428, 318528, H02P 700

Patent

active

040357040

ABSTRACT:
Apparatus is disclosed for controlling the speed of an electric motor by selectively connecting a field weakening resistor across the field winding of an electric motor. A first means is provided for comparing the field voltage to a fixed reference voltage and for generating a first signal in response to the field voltage falling below a first predetermined value and a second signal in response to the field voltage rising above a second predetermined value. A second means responsive to the first and second signals is provided for selectively connecting a field weakening resistor across the field winding of the motor in response to the field voltage falling below the first predetermined value. The second means responsive also disconnects the field weakening resistor in response to the field voltage rising above the second predetermined value.

REFERENCES:
patent: 3193698 (1965-07-01), Henderson et al.
patent: 3384799 (1968-05-01), Thiele
patent: 3590352 (1971-06-01), Ries
patent: 3656038 (1972-04-01), Ries et al.

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