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公开(公告)号：US20140239861A1
公开(公告)日：2014-08-28
申请号：US14192557
申请日：2014-02-27
Applicant: Hitachi Automotive Systems, Ltd.
Inventor： Toshiyuki AJIMA , Kimihisa FURUKAWA , Shigehisa AOYAGI , Tohma YAMAGUCHI , Daisuke GOTO , Masaki KASHIMA
IPC: H02P6/10
CPC classification number: H02P6/10 , H02P27/085
Abstract: An objective of the present invention is to improve current detection accuracy and to reduce noise of carrier frequency. A motor apparatus and a motor drive apparatus calculate motor currents Iu, Iv, and Iw using a DC bus current detected value Idc of an inverter and control a magnitude and a phase of an applied voltage of a motor to drive the motor. A carrier adjuster decreases a carrier frequency Fc of the inverter if a motor output is relatively larger and that increases the carrier frequency Fc of the inverter if the motor output is relatively smaller. A pulse shift adjuster shifts an interphase waveform of a PWM pulse according to the carrier frequency Fc.
Abstract translation: 本发明的目的是提高电流检测精度并降低载频的噪声。 电动机装置和电动机驱动装置使用逆变器的直流母线电流检测值Idc来计算电动机电流Iu，Iv，Iw，并控制电动机的施加电压的大小和相位来驱动电动机。 如果电动机输出相对较大，则载波调节器降低逆变器的载波频率Fc，并且如果电动机输出相对较小，则增加逆变器的载波频率Fc。 脉冲移位调整器根据载波频率Fc移位PWM脉冲的相间波形。
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公开(公告)号：US20200086910A1
公开(公告)日：2020-03-19
申请号：US16554447
申请日：2019-08-28
Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.
Inventor： Atsushi HIRATA , Kazuya YAMANO , Tatsuro SUZUKI , Masaki KASHIMA
Abstract: A steering device includes: an offset correction value storing section to store an offset correction value including a first offset correction value and a second offset correction value, the first offset value being a current value for correcting the first sensed current signal so that a value of a vibration of the electric motor is equal to or smaller than a first predetermined value when the motor rotation speed signal is a first rotation speed, and the second offset value being a current value for correcting the first sensed current signal so that the value of the vibration of the electric motor is equal to or smaller than a second predetermined value when the motor rotation speed signal is a second rotation speed.
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Patent Agency Ranking
3.发明申请公开(公告)号：US20190047614A1
公开(公告)日：2019-02-14
申请号：US16079491
申请日：2017-01-27
Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.
Inventor： Masaki KASHIMA , Yoshitaka SUGIYAMA , Masaki ITABASHI , Tadashi SUGANUMA , Kazuya YAMANO
Abstract: Provided is a control apparatus for a power steering apparatus, and a power steering apparatus using it that can reduce electromagnetic noise with the aid of a spread spectrum, thereby realizing stabilized motor control. The control apparatus for the power steering apparatus includes a PWM carrier period setting portion configured to set a natural number of PWM carrier periods within one period of a control period and also changeably set a length of the PWM carrier period, a motor current detection execution portion configured to detect a motor current during the control period, a motor rotational angle detection execution portion configured to detect a motor rotational angle during the control period, and an execution timing setting portion configured to set a timing at which the motor current is detected by the motor current detection execution portion or a timing at which the motor rotational angle is detected by the motor rotational angle detection execution portion, based on the control period set by the control period setting portion.
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公开(公告)号：US20200099269A1
公开(公告)日：2020-03-26
申请号：US16554459
申请日：2019-08-28
Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.
Inventor： Tatsuro SUZUKI , Masaki KASHIMA , Eiichiro ITO , Tatsuro MITSUHIRA
IPC: H02K5/06 , H02K5/10 , H02K7/06 , H02K11/215
Abstract: A motor is contained in a motor container space. A controller is contained in a controller container space. The motor container space and the controller container space are arranged in series in a direction of a rotation axis of a motor shaft, while interposing a partition wall therebetween. The motor shaft is inserted in a motor shaft through-hole of the partition wall. A magnet is disposed at an end of the motor shaft, in the controller container space. A rotation sensor is disposed in the controller container space oppositely to the magnet, for monitoring a rotational position of the motor shaft on the basis of variation in magnetic field due to rotation of the magnet. A cover made of nonmagnetic metal is disposed between the magnet and the rotation sensor so as to cover the motor shaft through-hole.
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公开(公告)号：US20180191283A1
公开(公告)日：2018-07-05
申请号：US15738781
申请日：2016-06-14
Applicant: Hitachi Automotive Systems, Ltd.
Inventor： Shigehisa AOYAGI , Toshiyuki AJIMA , Masaki KASHIMA , Hiroyuki OOTA
CPC classification number: H02P21/0089 , B62D5/046 , B62D5/0481 , H02P21/22
Abstract: Provided is a motor control device that realizes a high power drive and keeps a steering feeling having a good responsiveness with respect to an operation amount of a steering wheel like an electric power steering device while suppressing an input current to be equal to or lower than a predetermined value in response to a power source management as a vehicle. The motor control device of the invention includes an inverter which converts a DC input current from a DC voltage source into an AC current on the basis of a rotor phase of a motor and outputs the AC current. In a range in which an input current to the inverter does not exceed a predetermined upper limit while keeping a torque current, a maximum weak field current is calculated by a weak field current command calculation unit and is conducted.
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6.发明申请公开(公告)号：US20190013761A1
公开(公告)日：2019-01-10
申请号：US15752438
申请日：2016-07-29
Applicant: Hitachi Automotive Systems, Ltd.
Inventor： Masahiro SEO , Toshiyuki AJIMA , Shigehisa AOYAGI , Takafumi HARA , Masaki KASHIMA , Yawara KATO
CPC classification number: H02P27/08 , B60T7/042 , B60T13/662 , B60T13/745 , B62D5/046 , H02P6/16 , H02P6/28
Abstract: An object of the present invention is to provide an inverter driving device and an electric system which are capable of accurately detecting an offset amount of a current detection circuit that detects a motor current using a direct bus current, and compensating for the detected offset amount, to improve detection accuracy of the motor current and control the motor appropriately, without increasing the number of components of the inverter driving device. An inverter driving device of the present invention is configured to control driving of an inverter device that converts direct-current power supplied from a power source and outputs three-phase alternate-current power to a motor, in which the inverter driving device is configured to: detect a direct bus current flowing between the power source and the inverter device; calculate an offset current component to be superimposed on a detected value using the detected value where current values in two phases of the three-phase alternating current calculated in accordance with the detected value of the direct bus current substantially coincide with each other; and control driving of the inverter device in accordance with a current value for which the offset current component is compensated.
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公开(公告)号：US20170025973A1
公开(公告)日：2017-01-26
申请号：US15125094
申请日：2015-03-05
Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.
Inventor： Yoshitaka SUGIYAMA , Masaki KASHIMA , Hiroyuki OTA
CPC classification number: H02P6/15 , B62D5/046 , H02P6/085 , H02P27/085
Abstract: Provided are a power steering device and a control device for a power steering device, which are capable of reducing power consumption. The power steering device includes a current detection number setting circuit configured to set the number of times of detection of a DC bus current value by a current detecting circuit to a first predetermined number over a first predetermined cycle of a PWM period when the steering-state signal indicative of a steering operation state is received, and to set the number of times of detection so that the number of times of detection becomes smaller than the first predetermined number over the first predetermined cycle of the PWM period when a steering-state signal indicative of a non-steered state is received.
Abstract translation: 提供了能够降低功耗的动力转向装置和用于动力转向装置的控制装置。 动力转向装置包括：电流检测数设定电路，其被配置为当所述转向状态下的PWM周期的第一预定周期中将由所述电流检测电路检测到的DC总线电流值的次数设定为第一预定数 接收到表示转向操作状态的信号，并且设定检测次数，使得当指示的指示状态信号时，在PWM周期的第一预定周期内，检测次数变得小于第一预定次数 的非转向状态。
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