Patent ID: 8395347
Filing Date: 2013-03-12
Classification: H02J,H02M,H02P,Y02B

Abstract:
1. An induction motor control device being an induction motor control device controlling an induction motor to operate based on power supplied from a three-phase AC power supply, the induction motor control device comprising: three magnetic energy recovery switches that are connected in series in respective phases between the AC power supply and the induction motor and each have four self distinguishing elements; a first voltage detection unit provided between said magnetic energy recovery switches and the induction motor and measuring a terminal voltage of each of the phases that is applied to the induction motor; a second voltage detection unit provided between the AC power supply and said magnetic energy recovery switches and measuring voltages of the AC power supply; a current detection unit measuring currents to be supplied to the induction motor; and a gate control unit generating a gate signal that controls on • off of each of the self distinguishing elements included in each of the magnetic energy recovery switches of the respective phases, wherein based on measured values of the terminal voltages input from said first voltage detection unit, measured values of the currents input from said current detection unit, and measured values of the voltages of the AC power supply input from said second voltage detection unit, said gate control unit sets a switching phase of the gate signal so as to control a generation amount of reactive power and controls voltages to be applied to the induction motor.