公开(公告)号：US20240171107A1

公开(公告)日：2024-05-23

申请号：US18281731

申请日：2021-08-31

Applicant: Hitachi Astemo, Ltd.

Inventor： Shun TANIGUCHI ,  Noriya NAKAO ,  Kazuaki TOBARI ,  Toshiyuki AJIMA ,  Kentaro MATSUO

IPC: H02P25/024 ,  H02P21/14 ,  H02P21/22 ,  H02P27/08

CPC classification number: H02P25/024 ,  H02P21/141 ,  H02P21/22 ,  H02P27/08

Abstract: Disclosed is a synchronous machine control device capable of suitably executing stabilization control of a synchronous machine. This synchronous machine control device controls a power converter (2) to which a synchronous machine (1) is connected, and comprises: a first magnetic flux command calculation unit (21) that calculates a first magnetic flux command value from an electric current command value of the synchronous machine; a magnetic flux estimation unit (23) that estimates a magnetic flux value of the synchronous machine from an electric current detection value of the synchronous machine; a voltage calculation unit (19) that generates a voltage command value for the power converter such that the first magnetic flux command value and the magnetic flux value match; and a damping ratio control unit (27) that, on the basis of a vibration component of the magnetic flux value, generates a correction amount for the voltage command value such that the vibration component is damped.

公开(公告)号：US20240305233A1

公开(公告)日：2024-09-12

申请号：US18261863

申请日：2021-08-31

Applicant: HITACHI ASTEMO, LTD.

Inventor： Kentaro MATSUO

IPC: H02P27/08 ,  H02P21/05

CPC classification number: H02P27/08 ,  H02P21/05 ,  H02P2207/05

Abstract: A control device for an electric motor includes a harmonic voltage calculation unit that calculates a harmonic voltage to be added to a fundamental wave voltage command value, on a two-phase rotating coordinate system synchronized with a rotor phase, and a harmonic phase delay compensation unit that compensates for a phase delay during calculation in the harmonic voltage calculation unit based on a harmonic order of the harmonic voltage and an electrical angular frequency of the fundamental wave voltage.

公开(公告)号：US20230006586A1

公开(公告)日：2023-01-05

申请号：US17780349

申请日：2020-11-13

Applicant: HITACHI ASTEMO, LTD.

Inventor： Kentaro MATSUO ,  Kohei MYOEN ,  Kenichi YOSHIDA ,  Kazuyoshi AIZAWA

IPC: H02P21/18 ,  H02P21/22

Abstract: A power conversion device includes: an inverter that converts a DC voltage into an AC voltage and drives a synchronous motor; and a magnetic pole position correction unit that corrects an error in a magnetic pole position of a rotor from a rotation angle sensor of the synchronous motor. The magnetic pole position correction unit includes an actual current phase calculation unit that calculates a current phase from a current when three-phase lines are short-circuited during rotation of the synchronous motor and an ideal current phase calculation unit that calculates an ideal current phase based on a rotational speed of the rotor and a temperature of a stator, and corrects the magnetic pole position from a difference between outputs of the actual current phase calculation unit and the ideal current phase calculation unit.

公开(公告)号：US20220209702A1

公开(公告)日：2022-06-30

申请号：US17605322

申请日：2020-03-13

Applicant: HITACHI ASTEMO, LTD.

Inventor： Kentaro MATSUO ,  Noriya NAKAO ,  Kenichi YOSHIDA

IPC: H02P27/08 ,  H02P23/14 ,  B60R16/02

Abstract: Provided is a power conversion device that does not require adaptation work and can suppress a current beat regardless of an operation state of a motor. The power conversion device includes an inverter 1 that converts a DC voltage into an AC voltage and drives an AC motor 2, and beat compensation units 46 and 49 that suppress a current beat component of an output current of the inverter 1. The beat compensation units 46 and 49 include beat extraction units 50, 51, and 52 that calculate beat components of the output current of the inverter 1, and beat compensation voltage calculation units 53 and 54 that estimate beat compensation voltages from the beat components calculated by the beat extraction units 50, 51, and 52. The current beat component of the output current of the inverter 1 is suppressed based on the beat compensation voltages estimated by the beat compensation voltage calculation units 53 and 54.

公开(公告)号：US20240356470A1

公开(公告)日：2024-10-24

申请号：US18683522

申请日：2022-03-03

Applicant: HITACHI ASTEMO, LTD.

Inventor： Shun TANIGUCHI ,  Noriya NAKAO ,  Kentaro MATSUO ,  Kazuaki TOBARI ,  Toshiyuki AJIMA

IPC: H02P21/20 ,  H02P21/14 ,  H02P25/022

CPC classification number: H02P21/20 ,  H02P21/141 ,  H02P25/022 ,  H02P2205/05

Abstract: A synchronous-motor control device includes a torque-command-value conversion unit for converting a torque command value for a synchronous motor into a second-torque command value which gradually increases in a region including a peak of a torque of the synchronous motor, a voltage-phase control unit for controlling a voltage phase angle such that the torque of the synchronous motor matches the second-torque command value, and a power conversion unit for converting DC power into AC power based on the voltage phase angle and a rotational angle of the synchronous motor, and for outputting the AC power resulted from the conversion to the synchronous motor.

公开(公告)号：US20230246579A1

公开(公告)日：2023-08-03

申请号：US18012419

申请日：2021-04-20

Applicant: Hitachi Astemo, Ltd.

Inventor： Shun TANIGUCHI ,  Kentaro MATSUO ,  Kenichi YOSHIDA ,  Toshiyuki AJIMA

IPC: H02P21/14 ,  H02P21/22 ,  H02P27/06 ,  B60L50/51

CPC classification number: H02P21/14 ,  H02P21/22 ,  H02P27/06 ,  B60L50/51

Abstract: Provided are an electric motor control device and an electric motor control method with high reliability capable of performing noise reduction control (or sensorless control) by superimposing a radio-frequency voltage and capable of performing compensation of a dead time of an inverter with a minimum necessary configuration. The electric motor control device includes: a radio-frequency voltage superimposing unit that adds a radio-frequency voltage command value to a fundamental wave voltage command value and outputs a voltage command value; a radio-frequency current estimation value calculation unit that estimates a radio-frequency current value from the radio-frequency voltage command value; a dead time compensation current estimation value calculation unit that adds a radio-frequency current estimation value estimated by the radio-frequency current estimation value calculation unit to a fundamental wave current command value; and a dead time compensation voltage calculation unit that compensates an output voltage of an inverter according to a dead time compensation current estimation value calculated by the dead time compensation current estimation value calculation unit.

公开(公告)号：US20230155529A1

公开(公告)日：2023-05-18

申请号：US17911785

申请日：2020-12-28

Applicant: Hitachi Astemo, Ltd.

Inventor： Shun TANIGUCHI ,  Kazuaki TOBARI ,  Noriya NAKAO ,  Toshiyuki AJIMA ,  Kenichi YOSHIDA ,  Kentaro MATSUO ,  Eigo KISHIMOTO

IPC: H02P21/14 ,  H02P21/22 ,  H02P27/12 ,  B60L15/20

CPC classification number: H02P21/141 ,  H02P21/22 ,  H02P27/12 ,  B60L15/20 ,  H02P2207/05

Abstract: There is provided a synchronous machine control device capable of improving the performance of a motor without complicating a control system. The synchronous machine control device controls a power converter (2) that supplies electric power to a synchronous machine (1). The synchronous machine control device includes a first magnetic flux command computation unit (21) that computes a first magnetic flux command value (φd*, φq*) from a current command value (Id*, Iq*) of the synchronous machine (1), a magnetic flux estimation unit (23) that estimates a magnetic flux value (φdc, φqc) of the synchronous machine (1) from a current detection value (Idc, Iqc) of the synchronous machine (1), and a voltage computation unit (19) that creates a voltage command value (Vd*, Vq*) of the power converter such that the first magnetic flux command value (φd*, φq*) coincides with the magnetic flux value (φdc, φqc).