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公开(公告)号：US12212255B2
公开(公告)日：2025-01-28
申请号：US18012419
申请日：2021-04-20
Applicant: Hitachi Astemo, Ltd.
Inventor： Shun Taniguchi , Kentaro Matsuo , Kenichi Yoshida , Toshiyuki Ajima
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.
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公开(公告)号：US12170497B2
公开(公告)日：2024-12-17
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 , B60L50/51 , B60L53/20 , H02M7/5395
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.
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公开(公告)号：US11646690B2
公开(公告)日：2023-05-09
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
CPC classification number: H02P27/085 , B60L15/20 , B60K6/485 , B60Y2200/91 , B60Y2200/92
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.
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公开(公告)号：US11558000B2
公开(公告)日：2023-01-17
申请号：US16965147
申请日：2019-01-24
Applicant: Hitachi Astemo, Ltd.
Inventor： Takafumi Hara , Toshiyuki Ajima , Akihiro Ashida
IPC: H02P27/08 , H02M1/44 , H02P23/28 , H02M7/5395
Abstract: An object of the present invention is to provide a motor control device that can suppress electromagnetic noises including a switching noise and to an electric vehicle system using the motor control device. A motor control device includes: a power converter that is controlled by a pulse width modulation signal; a motor that is driven by the power converter; and a controller that generates the pulse width modulation signal, based on a carrier signal. When switching between a first carrier frequency (fc1) of the carrier signal and a second carrier frequency (fc2) of the carrier signal, the controller varies proportions of the first carrier frequency and the second carrier frequency in accordance with a number of rotations of the motor, the second carrier frequency being higher than the first carrier frequency.
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公开(公告)号：US12074542B2
公开(公告)日：2024-08-27
申请号：US17641179
申请日：2020-08-14
Applicant: HITACHI ASTEMO, LTD.
Inventor： Takafumi Hara , Toshiyuki Ajima , Katsuhiro Hoshino , Noriyuki Maekawa
CPC classification number: H02P21/16 , H02P21/22 , H02P27/12 , B60K1/00 , B60K6/26 , B60Y2200/92 , B60Y2400/604 , H02P2207/05
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.
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Patent Agency Ranking
公开(公告)号：US11984821B2
公开(公告)日：2024-05-14
申请号：US17761444
申请日：2020-07-31
Applicant: Hitachi Astemo, Ltd.
Inventor： Toshiyuki Ajima , Takafumi Hara , Akihiro Ashida , Hirokazu Matsui
CPC classification number: H02M7/5395 , B60L15/08 , H02M1/12 , H02P27/08 , H02P29/40 , B60L2210/40
Abstract: An inverter control device 200 includes a current control unit 210 that outputs a voltage commands (Vd*, Vq*), a modulation wave control unit 220 that generates a modulation wave based on the voltage commands (Vd*, Vq*), a pulse generation unit 230 that generates a PWM pulse for controlling an inverter 100 using a modulation wave and a carrier wave of a predetermined frequency, and a pulse shift unit 250 that corrects the phase of the PWM pulse such that the PWM pulse is output in a phase corresponding to a harmonic of a predetermined order of the modulation wave in the near-zero-cross region including the zero-cross point at which the modulation wave changes across 0.
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公开(公告)号：US11967915B2
公开(公告)日：2024-04-23
申请号：US17778544
申请日：2020-11-04
Applicant: Hitachi Astemo, Ltd.
Inventor： Takaya Tsukagoshi , Takafumi Hara , Katsuhiro Hoshino , Toshiyuki Ajima
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.
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公开(公告)号：US12149183B2
公开(公告)日：2024-11-19
申请号：US17788659
申请日：2020-12-08
Applicant: HITACHI ASTEMO, LTD.
Inventor： Takafumi Hara , Toshiyuki Ajima , Akihiro Ashida , Kiyoshi Kuroda , Yoshinori Aoshima
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.
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9.发明授权公开(公告)号：US12074551B2
公开(公告)日：2024-08-27
申请号：US17918197
申请日：2021-01-22
Applicant: Hitachi Astemo, Ltd.
Inventor： Takafumi Hara , Toshiyuki Ajima , Takaya Tsukagoshi , Katsuhiro Hoshino
CPC classification number: H02P27/08 , B60L53/20 , H02P23/14 , B60L2210/40
Abstract: The present invention addresses the problem of properly performing motor control during overmodulation. In a motor control device 1, a carrier wave frequency adjusting unit 16 adjusts a carrier wave frequency fc so as to change a voltage phase error Δθv representing the phase difference between three-phase voltage commands Vu*, Vv*, Vw* and a triangular wave signal Tr. When a modulation factor H in accordance with the voltage amplitude ratio between the DC power supplied from a high voltage battery to an inverter and AC power output from the inverter to a motor exceeds a predetermined value, for example, 1.15, a current control unit 14 corrects the amplitudes and phases of a d-axis voltage command Vd* and a q-axis voltage command Vq* on the basis of a carrier wave phase difference Δθcarr representing the phase of the triangular wave signal Tr.
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公开(公告)号：US11611292B2
公开(公告)日：2023-03-21
申请号：US17421918
申请日：2019-08-19
Applicant: Hitachi Astemo, Ltd.
Inventor： Shigehisa Aoyagi , Toshiyuki Ajima , Kotaro Shiino
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 any one of a first drive signal transmitted from the first transmission path and a second drive signal transmitted from the second transmission path.
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