DEVICE TO MEASURE BRUSH PRESSURE AT COLLECTOR OF ELECTRIC MACHINES Russian patent published in 2012 - IPC H01R39/58 G01L1/12 

FIELD: electricity.

SUBSTANCE: device comprises a recording instrument and a force sensor arranged in the body in the form of two elastic magnetic elements with excitation windings and metering windings. The first elastic magnetic element via a metal ball and a protective device is connected with a brush. Excitation windings of elastic magnetic elements are included into oscillating circuits of two generators of sinusoidal voltage. Outside the force sensor body there is a transmitting and a receiving magnetic antennas with windings. A winding of a transmitting magnetic antenna is connected with a mixer's output, and a winding of a receiving magnetic antenna via a converter is connected to a recording instrument. Additionally there is a circular guide and two metal balls. The first elastic magnetic element is arranged with smaller dimensions and is installed inside the second elastic magnetic element in a mutually perpendicular plane, and is joined with it via a circular guide and two metal balls, installed at both sides of the first elastic magnetic element in the same plane. Metering windings of the first and second elastic magnetic elements are accordingly connected with the first and second inputs of the mixer, and the protective device is arranged in the form of a flat spring.

EFFECT: expansion of amplitude and frequency ranges of measurements, due to increasing sensitivity, accuracy of measurements and increased distance of remote signal transfer.

1 dwg