ROUGHNESS INDICATOR TO CONTROL ELECTRICAL MACHINE COMMUTATOR MICRO GEOMETRY Russian patent published in 2011 - IPC G01B7/34 

FIELD: physics.

SUBSTANCE: proposed indicator comprises eddy current transducer mounted above commutator surface and consisting of differential amplifier and bridge. One arm of said bridge is formed by metering and compensating coils while another one is made up of pure resistors. Bridge central points are connected to differential amplifier inputs. Buffer amplifier is connected to differential amplifier output. Buffer amplifier is connected with first amplitude detector and circuit that coverts phase response into amplitude response. Circuit that converts phase response into amplitude response consists of zero detector, current limiting resistor, band pass filter and second differential amplifier, and is connected to second amplitude detector. First and second amplitude detectors are connected with first and second output differential amplifiers, respectively. Output differential amplifiers are connected with recorder and micro controller connected via communication links converter with personal computer. Micro controller is also connected with band pass filter with buffered and connected with eddy current transducer and aforesaid conversion circuit.

EFFECT: simplified measurement.

5 dwg