Patent ID: 9140728
Filing Date: 2015-09-22
Classification: F04B,F04D,G01R,H02H

Abstract:
1. A sensor module for a compressor having an electric motor connected to a power supply that includes first, second, and third phases, the sensor module comprising: a first input connected to a first voltage sensor that generates a first voltage signal corresponding to a voltage of said first phase of said power supply; a second input connected to a second voltage sensor that generates a second voltage signal corresponding to a voltage of said second phase of said power supply; a third input connected to a third voltage sensor that generates a third voltage signal corresponding to a voltage of said third phase of said power supply; a fourth input connected to a current sensor that generates a current signal corresponding to a current of said first phase of said power supply; a processor connected to said first, second, third, and fourth inputs that calculates a first estimated current corresponding to a current of said second phase of said power supply and a second estimated current corresponding to a current of said third phase of said power supply based on voltage measurements from said first, second, and third inputs and current measurements from said fourth input, and that calculates a power factor of said compressor based on said voltage measurements from said first, second, and third inputs, said current measurements from said fourth input, and said first and second estimated currents.