Procedure for measuring the current in each phase of a three phase device via single current sensor

摘要: A method for measuring the current in each phase of a three-phase motor ( 26 ) by sensor 32 ), being controlled plurality switching devices (S 1 -S 6 that receive pulse width modulation signals from controller 34 ). In one embodiment, first and second sampling window (t t 2 are monitored. When both windows less than minimum (mw), voltage trains associated with highest output (V_h) lowest (V_l) shifted to form modified ′) ′). is greater then train and/or middle (V_m) may be ′ (mw) The sample during ′), respectively. third calculated based on currents.