DEVICE TO MEASURE ROTARY SHAFT AXIAL FORCE AND RPM Russian patent published in 2009 - IPC G01L1/12 G01L5/12 

FIELD: physics, measurements.

SUBSTANCE: invention relates to instrumentation and can be used for measurement of axial loads and RPM of rotary shafts. The proposed device comprises a transducer arranged with a gap relative to the shaft, phase shifter, AC voltage source with its output connected to the transducer excitation winding and to the phase shifter, adder with its one input connected with the transducer output and the other one connected with phase shifter output. Note that the adder output is connected, via bandpass filter and rectifier connected in series, to the first low-pass filter input. There are also the second and third low-pass filters with their outputs connected with the instruments. Note here that a reference sensitive element fitted on the shaft surface is used as a transducer and is made from a homogeneous high magneto-elastic sensitivity material. Note that, additionally, the proposed device incorporates a contactless key with its first input connected to the first low-pass filter output and its output connected to the second low-pass filter input, comparator with its input connected to the high-pass filter output and its output connected to the second input of aforesaid contactless key, a clock element with input connected to the comparator output and its output connected to the third low-pass filter input.

EFFECT: higher reliability, noise immunity, accuracy of measurement and ease of operation.

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