公开(公告)号：US20220014138A1

公开(公告)日：2022-01-13

申请号：US17293622

申请日：2019-08-07

Applicant: LS ELECTRIC CO., LTD.

Inventor： Seung-Cheol CHOI ,  Hak-Jun LEE

IPC: H02P27/08 ,  H02M7/5395 ,  H02P21/14

Abstract: The present disclosure provides an inverter control device which estimates back electromotive force of an induction motor, and which uses a torque current and a flux current so as to calculate a slip frequency and compensate for same, thereby enabling the motor to operate at a constant speed. To this end, the present invention may comprise: a command voltage generating unit for outputting, to an inverter, a three phase PWM voltage with respect to a command frequency on the basis of a voltage/frequency operation; and a slip frequency determining unit for determining a slip frequency on the basis of a phase current and a phase voltage of a motor driven by the inverter.

公开(公告)号：US20220014139A1

公开(公告)日：2022-01-13

申请号：US17293631

申请日：2019-08-07

Applicant: LS ELECTRIC CO., LTD.

Inventor： Seung-Cheol CHOI ,  Hak-Jun LEE

IPC: H02P27/08 ,  H02M7/5395 ,  H02P21/18 ,  H02P21/22

Abstract: The present disclosure provides an inverter control device for estimating the magnetic flux of a rotor, and calculating and compensating for a slip frequency on the basis of a torque current and a magnetic flux current, to control the speed of an electric motor. To this end, the present invention may comprise: a command voltage generation unit for outputting a three-phase PWM voltage with respect to a command frequency to an inverter on the basis of voltage/frequency operation; and a slip frequency determination unit for determining a slip frequency on the basis of the phase current and phase voltage of an electric motor driven by the inverter.