Patent ID: 9647606
Date: 2017-05-09
CPC Classifications: G01D,H02P

Claim:
1. A measuring apparatus for measuring movement of an object that has a quadrature incremental encoder for providing first and second phases of encoder pulses corresponding to incremental displacements of the object, the measuring apparatus comprising: a first counter for providing encoder pulse counts according to a sense of the displacement; a clock for providing clock pulses at a defined frequency; a further counter connected to the clock for providing clock pulse counts; a decoder for acquiring movement data at periodic speed processing moments as a function of the encoder pulse counts and the clock pulse counts, wherein the decoder acquiring movement data includes adjusting encoder pulse data from the first counter using a clock pulse count that is a function of a lapse of time between a most recent edge of the encoder pulses and the speed processing moment when the decoder acquires the movement data, and wherein the clock pulse counts are reset by the first and second phases of the encoder pulses when the decoder acquires the movement data, and a control module for controlling a motor drivingly coupled to the object, wherein the control module controls the motor as a function of the movement data from the decoder.