Tachometric measuring device for direct-current motors, and moto

Details Tachometric measuring device for direct-current motors, and moto Tachometric measuring device for direct-current motors, and moto

1978-09-12

1980-08-19

Smith, Jr., David

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

310 68C, 318334, 318473, H02P 516

Patent

active

042186404

ABSTRACT:
A stationary device for sensing the rotational speed of electric motors, comprising an impedance bridge circuit, the motor being inserted into one branch of the bridge in series with a resistive element, and a voltage proportional to the rotational speed being derived across a diagonal of the bridge, the resistive element being a winding wound directly on to the motor, in order to make it isothermic, and insensitive to the magnetic field of said motor by a form of winding of the "two wires in hand" type.

REFERENCES:
patent: 2619573 (1952-11-01), Dawson, Jr.
patent: 2717945 (1955-09-01), Dresios et al.
patent: 3219856 (1965-11-01), Dunwiddie et al.
patent: 3422313 (1969-01-01), Snoberger et al.
patent: 3458155 (1969-07-01), Planteisdt
patent: 3568027 (1971-03-01), Bacon
patent: 3705337 (1972-12-01), Grabl
patent: 4145642 (1979-03-01), Kosaka et al.

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