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：US20220345060A1

公开(公告)日：2022-10-27

申请号：US17641179

申请日：2020-08-14

Applicant: HITACHI ASTEMO, LTD.

Inventor： Takafumi HARA ,  Toshiyuki AJIMA ,  Katsuhiro HOSHINO ,  Noriyuki MAEKAWA

IPC: H02P21/16 ,  H02P21/22 ,  H02P27/12

Abstract: Conventionally, there is a problem that switching loss of an inverter increases in a case where a change such as improvement in a switching frequency is involved. The battery voltage E and the torque command T* are input to the first current command generation unit 111. The battery voltage E, the torque command T*, and a voltage utilization rate obtained by dividing a line voltage effective value by a battery voltage (DC voltage) are input to a second current command generation unit 112. A magnet temperature Tmag of a rotor magnet is input to a current command selection unit 113, and a current command output from the first current command generation unit 111 is selected in normal operation, and the second current command generation unit 112 is selected in a case where the magnet temperature exceeds a predetermined value. The second current command generation unit 112 is configured not to obtain the voltage utilization rate of 0.3 to 0.4.

公开(公告)号：US20220029572A1

公开(公告)日：2022-01-27

申请号：US17421918

申请日：2019-08-19

Applicant: Hitachi Astemo, Ltd.

Inventor： Shigehisa AOYAGI ,  Toshiyuki AJIMA ,  Kotaro SHIINO

IPC: H02P27/08 ,  H02M7/537 ,  H02P25/22

Abstract: An object of the present invention is to provide a power conversion device including a plurality of inverter circuits connected in parallel to a load, the power conversion device being capable of performing control with a smaller number of microcomputers, having high reliability, and being advantageous for miniaturization and cost reduction. Provided are: a plurality of inverter circuits connected in parallel to a load; a microcomputer which controls the plurality of inverter circuits; a plurality of signal selection units which select a drive signal of each of the plurality of inverter circuits; and a first transmission path and a second transmission path which are connected in parallel between the microcomputer and the plurality of signal selection units and transmit the drive signal of each of the plurality of inverter circuits from the microcomputer to each of the plurality of signal selection units. Each of the plurality of signal selection units selects anyone of a first drive signal transmitted from the first transmission path and a second drive signal transmitted from the second transmission path.

公开(公告)号：US20240128908A1

公开(公告)日：2024-04-18

申请号：US18277117

申请日：2021-08-31

Applicant: Hitachi Astemo, Ltd.

Inventor： Noriya NAKAO ,  Shun TANIGUCHI ,  Toshiyuki AJIMA ,  Keiji KADOTA

IPC: H02P21/22 ,  B60K1/00 ,  B60L15/20

CPC classification number: H02P21/22 ,  B60K1/00 ,  B60L15/20 ,  B60L2240/423 ,  B60L2240/427

Abstract: A motor drive device is a device that controls torque generated by a motor, based on a d-axis current and a q-axis current, to drive the motor. The motor drive device includes a d-axis current instruction generating unit that calculates a first d-axis current instruction, a current instruction correcting unit that generates a positive correction quantity that is added to the first d-axis current instruction when a voltage across terminals of the motor is equal to or larger than a given value, and a voltage feedback control unit that generates a negative correction quantity that is added to the first d-axis current instruction to prevent the voltage across the terminals of the motor from exceeding a given maximum output voltage. The motor drive device controls the torque, based on a second d-axis current instruction created by adding the positive correction quantity and the negative correction quantity to the first d-axis current instruction and on a q-axis current instruction.

公开(公告)号：US20240042867A1

公开(公告)日：2024-02-08

申请号：US18266307

申请日：2021-09-29

Applicant: HITACHI ASTEMO, LTD.

Inventor： Takafumi HARA ,  Toshiyuki AJIMA ,  Kyoshiro ITAKURA ,  Takeshi TOKUYAMA ,  Takahiro ARAKI ,  Shigehisa AOYAGI

IPC: B60L15/20 ,  B60L15/00 ,  H02P27/06

CPC classification number: B60L15/20 ,  B60L15/007 ,  H02P27/06 ,  B60L2210/40

Abstract: A motor control device connected to a power converter that performs power conversion from DC power to AC power and controls driving of an AC motor that is driven by using the AC power includes a voltage command generation unit that generates a three-phase voltage command; and a gate signal generation unit that performs pulse width modulation on the three-phase voltage command and generates a gate signal for controlling an operation of the power converter, in which the voltage command generation unit adjusts the three-phase voltage command by using a zero-phase voltage based on a power factor of the AC power in an overmodulation region in which a modulation factor according to a voltage amplitude ratio between the DC power and the AC power exceeds a predetermined threshold value, and the gate signal generation unit generates the gate signal by performing pulse width modulation on the adjusted three-phase voltage command.

公开(公告)号：US20210384859A1

公开(公告)日：2021-12-09

申请号：US17282453

申请日：2019-09-12

Applicant: HITACHI ASTEMO, LTD.

Inventor： Takafumi HARA ,  Midori TAKAOKA ,  Toshiyuki AJIMA ,  Hirokazu MATSUI ,  Akihiro ASHIDA

IPC: H02P27/08 ,  B60L15/20

Abstract: A random value integration unit 175 outputs a random value output from a random value generation unit 174 in a diffusion width Rand output from a diffusion width generation unit 173 by a product of an output of the random value generation unit 174 and an output of the diffusion width generation unit 173. A triangular wave signal generation unit 176 generates a triangular wave signal corresponding to a second carrier frequency fc2 which is obtained by adding the random value output from the random value integration unit 175 to a first carrier frequency fc1 which is an output of a carrier frequency setting unit 171. That is, a frequency obtained by increasing the diffusion width of the first carrier frequency fc1 is used as the second carrier frequency fc2, and the second carrier frequency is used as the carrier frequency.

公开(公告)号：US20230155534A1

公开(公告)日：2023-05-18

申请号：US17917395

申请日：2021-01-22

Applicant: Hitachi Astemo, Ltd.

Inventor： Toshiyuki AJIMA ,  Takafumi HARA ,  Akihiro ASHIDA ,  Hirokazu MATSUI ,  Kiyoshi KURODA

IPC: H02P27/08 ,  H02M7/5395 ,  B60L53/20 ,  B60L50/51

CPC classification number: H02P27/08 ,  H02M7/5395 ,  B60L53/20 ,  B60L50/51 ,  B60L2210/40

Abstract: An inverter control device 200 includes a PWM control unit 220 that generates a PWM pulse for controlling an inverter 100, and a pulse edge control unit 250 that performs pulse edge control for correcting (shifting) a phase of a pulse edge of the PWM pulse generated by the PWM control unit 220. The PWM control unit 220 generates a PWM pulse by using a modulation rate based on a voltage command (Vd*, Vq*). The pulse edge control unit 250 corrects the PWM pulse so that a phase difference between a zero cross point where the modulation wave changes across 0 and a pulse edge of the PWM pulse falls within a predetermined range.

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).

公开(公告)号：US20230035063A1

公开(公告)日：2023-02-02

申请号：US17788659

申请日：2020-12-08

Applicant: HITACHI ASTEMO, LTD.

Inventor： Takafumi HARA ,  Toshiyuki AJIMA ,  Akihiro ASHIDA ,  Kiyoshi KURODA ,  Yoshinoi AOSHIMA

IPC: H02M7/5387 ,  H02M1/00 ,  H02P27/08 ,  H02P21/22 ,  B60L53/22

Abstract: A deviation between a detection result of an output current of an inverter and an actual current is suppressed. A current detection unit 7 detects a three-phase AC current output from an inverter 3 or input to the inverter 3. An inverter control device 1 controls the inverter 3 based on a current detection value based on a detection result of the three-phase AC current by the current detection unit 7 and a predetermined current command value. The inverter control device 1 corrects the current detection value so as to correct a detection error of the three-phase AC current generated due to a delay time of a filter 72 which is a filter element provided in the current detection unit 7.

公开(公告)号：US20230008549A1

公开(公告)日：2023-01-12

申请号：US17778544

申请日：2020-11-04

Applicant: Hitachi Astemo, Ltd.

Inventor： Takaya TSUKAGOSHI ,  Takafumi HARA ,  Katsuhiro HOSHINO ,  Toshiyuki AJIMA

IPC: H02P27/08 ,  H02P21/18 ,  H02P6/10 ,  H02M1/12 ,  H02M7/5395 ,  B62D5/04

Abstract: The vibration and noise generated in a permanent magnet synchronous motor are effectively suppressed. A motor control device 1 comprises: a triangular wave generation unit 17 which generates a triangular wave signal Tr that is a carrier wave, a carrier frequency adjustment unit 16 which adjusts a carrier frequency fc that represents a frequency of the triangular wave signal Tr, and a gate signal generation unit 18 which performs pulse-width modulation on three-phase voltage commands Vu*, Vv*, Vw* according to a torque command T* using the triangular wave signal Tr, thereby generating a gate signal for controlling an operation of an inverter. The carrier frequency adjustment unit 16 adjusts the carrier frequency fc so as to change a voltage phase error Δθv representing a phase difference of the three-phase voltage commands Vu*, Vv*, Vw* and the triangular wave signal Tr based on the torque command T*, and a rotation speed ωr of a motor.