公开(公告)号：US11677342B2

公开(公告)日：2023-06-13

申请号：US17697899

申请日：2022-03-17

Applicant: KOOKMIN UNIVERSITY INDUSTRY ACADEMY COOPERATION FOUNDATION

Inventor： Geun Ho Lee ,  Dong Gil Kang ,  Soon Ho Kwon ,  Ji Hwan Park ,  Joon Ik Uhm ,  Hee Sun Lim ,  Jung Jun Kim

IPC: H02P6/16

CPC classification number: H02P6/16 ,  H02P2203/03 ,  H02P2203/09 ,  H02P2207/05

Abstract: A method for detecting an initial position of a rotor of a permanent magnet synchronous motor in a no-load environment can comprise the steps of: estimating a temporary initial position α′ by means of aligning a d axis; measuring a first voltage command which is output by performing velocity control within predetermined velocity ranges with respect to the forward direction of a motor on the basis of the temporary initial position α′; measuring a second voltage command which is output by performing velocity control within the predetermined velocity range with respect to the reverse direction of the motor on the basis of the temporary initial position α′; calculating respective variations of the first voltage command and second voltage command, and calculating a compensation angle α″; and calculating an initial position α of the rotor on the basis of the sum of the temporary initial position α′ and compensation angle α″.

公开(公告)号：US11418104B2

公开(公告)日：2022-08-16

申请号：US17761589

申请日：2020-10-23

Applicant: KOOKMIN UNIVERSITY INDUSTRY ACADEMY COOPERATION FOUNDATION

Inventor： Geun Ho Lee ,  Jae Yeob Hwang ,  Hee Sun Lim ,  Dong Gil Kang ,  Dong Ok Kim

IPC: H02M1/00 ,  H02M7/5395 ,  G01K7/16 ,  G01R19/10

Abstract: Disclosed are a current measurement method for a three-phase pulse width modulation inverter using a real-time switch junction temperature estimation technique, and a three-phase pulse width modulation inverter system. The current measurement method may comprise the steps of: calculating a power loss of a switch of an inverter; estimating the junction temperature (T j) of the switch by using a thermal equivalent circuit; estimating a resistance (R ds on) value between both ends of a drain and a source by using a resistance (R ds on) map based on the junction temperature (T j); and using, as a control signal of the inverter, a current value calculated based on the estimated resistance (R ds on) value.