Jtekt Corporation

Koyo Seiko Company, Ltd.

Koyo Electronics Industries Co., Ltd.

Denso Corporation

Fujitsu Ten Limited

Shigeki Nagase

Takeshi Ueda

Ken Matsubara

Masahiko Sakamaki

Hiroshi Sumasu

Nobuhiro Uchida

Naotake Kanda

Kunihiro Oka

Kouya Yoshida

Motoo Nakai

Katsutoshi Nishizaki

Toshiaki Oya

Yuji Kariatsumari

Shirou Nakano

Minoru Sentoku

Yoshikazu Kuroumaru

Akira Sugimoto

Shiro Nakano

Yoshiyuki Shibata

Masaya Segawa

Masami Naka

Kouji Kitahata

Yasuyuki Yoshii

Takaya Nagahama

Noboru Niguchi

Takashi Kageyama

Yasuyuki Wakita

Kazuo Tada

Takayasu Yamazaki

Yasuhiro Saitou

Yasuhiro Kamatani

Yasuhide Takeda

Norimitsu Yukumatsu

Tomoya Noda

Kimihito Chino

Takeshi c/o Jtekt Corporation Ueda

Yasuhiro c/o Jtekt Corporation Saitou

A gate pad and a source pad are disposed on a semiconductor layer. The gate pad is disposed at the center portion of the semiconductor layer and has the shape of a circle centered on the center of the semiconductor layer as viewed in plan. The source pad is disposed so as to surround the gate pad, and has the shape of a circular ring centered on the center of the semiconductor layer as viewed in plan. A plurality of unit cells that compose a trench type MOSFET element are formed in the semiconductor layer.

Semiconductor device for reducing gate wiring length

In a semiconductor device, each of a first connection metal member, a second connection metal member, a third connection metal member, and a fourth connection metal member electrically connects a corresponding line to a corresponding one of main electrodes formed on lower surfaces and upper surfaces of first and second semiconductor elements. A cross-sectional area of each of the first connection metal member, the second connection metal member, the third connection metal member, and the fourth connection metal member is larger than a cross-sectional area of a fifth connection metal member that is disposed at a region located outside regions of the first and second semiconductor elements in a plan view.

Semiconductor device

A circuit board includes control circuit patterns and first drive circuit patterns. A base maintains the circuit board in a state in which the base is opposed to a portion of the circuit board, in which the control circuit patterns are formed, across a space that allows control circuit elements to be mounted at the circuit board. A line module includes second drive circuit patterns electrically connected to the first drive circuit patterns so as to constitute a part of lines of a drive circuit, and is sandwiched between a portion of the circuit board, in which the first drive circuit patterns are formed, and the base.

Control device and vehicle steering system including control device

At least part of each bridge portion is heated and molten to form a keyhole, and a nonmagnetic element is disposed around the keyhole. Thus, even when the width of the bridge portion in the radial direction is increased, the bridge portion is demagnetized. Therefore, leakage flux in the bridge portion is reduced, and the output power of a motor is increased. Moreover, by increasing the width of the bridge portion in the radial direction, the strength of the bridge portion is increased, and breakage of the bridge portion due to a centrifugal force at high-speed rotation of a rotor is prevented.

Rotor for motor and method of manufacturing the same

An electric power steering apparatus () comprises a control device (), which controls driving of an electric motor () based on the detection signals from a rotational position-detecting sensor (A), which detects the rotational position of the rotor () of the electric motor (), and a steering status detecting sensor (A). The control device () is housed in a housing () that is partitioned by a first housing (), which is at least a portion of the motor housing () for the electric motor (), and a second housing (A;B) that touches the first housing (). At least one of the rotational position-detecting sensor (A) and steering state detecting sensor (A) is connected to the control device () by means of only a signal wire () inside the first housing () or the second housing (A;B).

Vehicle steering apparatus and manufacturing method of same

A motor control device comprising a control board for controlling driving of an electric motor, the control board including a multilayer circuit board having inner layers and outer layers, a ground pattern disposed around an output shaft of the electric motor formed on one of the inner layers, and a severed portion formed on a part of the ground pattern, so as to sever through the ground pattern in a radial direction of the output shaft. The construction reduces noise from the motor control device.

Motor control device and vehicle steering system

A FET for driving an electric motor includes a source electrode. The source electrode has main electrode surfaces to which bonding wires, through which a drive current for an electric motor passes, are joined, and inspection electrode surfaces that are arranged so as to be independent of and apart from the main electrode surfaces. The inspection electrode surfaces are provided so as to contact a probe of an inspection device that performs an inspection of the FET

Semiconductor device for driving electric motor

A command current setting portion has a target value corrector that calculates d-axis and q-axis current command values idc, iqc that are to be supplied to an open-loop controller, based on d-axis and q-axis current target values id*, iq*. When d-axis and q-axis voltage target value vd*, vq* calculated from the d-axis and q-axis current target values id*, iq* by the motor circuit equations exceed a voltage limit, this target value correctorcorrects the d-axis and q-axis current target values id*, iq* by the field weakening control such that d-axis and q-axis voltages vd, vq and d-axis and q-axis currents id, iq satisfy &#x221a;(vd+vq)&#x2266;Vlim and &#x221a;(id+iq)&#x2266;Ilim respectively. The d-axis and q-axis current command values idc, iqc are obtained by this correction.

Motor controller and electronic power steering apparatus

An angle calculator detects a rotation angle &#x3b8;a of a rotor. A three-phase/d-q axis converter outputs detected current id, iq on d-q coordinate axes by making a conversion, based on a corrected detection angle &#x3b8;c obtained by adding or subtracting an amount of detection deviation from a time point of current detection to or from the detection angle &#x3b8;a. A command current calculator calculates command current id*, iq* on the d-q coordinate axes based on a steering torque T and a speed S. A feedback controller calculates command voltages vd, vq on the d-q coordinate axes based on the command current id*, iq* and the detected current id, iq. A d-q axis/three-phase converter converts the command voltages vd, vq into three-phase command voltages, based on a corrected detection angle &#x3b8;b obtained by adding an amount of detection deviation from a time point when a motor is driven to the detection angle &#x3b8;a. The deviation can be eliminated by the command voltages, and the motor can be driven with high precision.

In a motor controller, a current detection unit detects an electric current flowing through a brushless motor. An open loop control unit determines a command value indicating a level of a command voltage in accordance with a motor circuit equation, based on a command current value indicating an amount of electric current to be supplied to the brushless motor and an angular velocity of a rotor in the brushless motor. A correction unit calculates a correction value based on a difference between the command current value and a current value detected by the current detection unit when the electric current is detected by the current detection unit and corrects the command value according to the correction value, and corrects the command value according to the correction value even when an electric current is not detected by the current detection unit.

Motor controller and electric power steering system

A multilayer circuit substrate includes: a laminated circuit portion in which conductive layers and resin insulating layers are alternately laminated; and a metal substrate portion, wherein the laminated circuit portion is fixed to the metal substrate portion so that at least part of a lower surface of the laminated circuit portion is in contact with at least part of an upper surface of the metal substrate portion. An electronic component is mounted on the metal substrate portion.

Multilayer circuit substrate

Disclosed is a vehicle steering apparatus () equipped with a control device () which controls the actuation of an electric motor (). First and second housings (), which are in contact with each other, partition off an accommodation chamber () which contains the control device (). The first housing () is at least one part of the motor housing (). The first housing () includes a first interior wall surface () which partially partitions the accommodation chamber (). The second housing () includes a second interior wall surface () which partially partitions the accommodation chamber (). The first and the second interior wall surfaces () are opposite each other with respect to the axial direction (X) of a rotatable shaft () of an electric motor (). The second interior wall surface () includes the flat annular surface that surrounds a central axis (C) of the rotatable shaft () and an extension (C) of the central axis (C). The flat circular surface is orthogonal to the central axis (C) and the extension (C) of same.

Vehicle steering apparatus

A motor control device of the present invention includes: target electric current value setting units (and) that set target electric current values that should be supplied to a motor (), basic voltage value computing units (, and) that compute basic voltage values for driving the motor, a rotation angle speed computing unit () that computes a rotation angle speed of the motor, correction value computing units (, and) that compute correction values for correcting the basic voltage values based on motor electric current values and a rotation angle speed of the motor, correcting units (and) that obtain voltage command values by correcting the basic voltage values by the correction values computed by the correction value computing units, and a driving unit () that drives the motor by using voltage command values. The correction value computing units include correction value smoothing units (, and) for obtaining smoothed correction values.

Motor control device

An angle calculator determines an angle of a rotor. An angular speed calculator determines an angular speed of the rotor. A command current calculator determines a command current defined on a dq-axis. An open loop controller determines a command voltage defined on the dq-axis in accordance with a circuit equation of a motor, based on the command current and the angular speed. A dq-axis/three-phase converter converts the command voltage into a three-phase command voltage. A resistance calculator and a &#x3a6;-value calculator respectively determines circuit resistance including armature winding resistance and a number of armature winding linkages which are included in the circuit equation of the motor, based on temperature of the motor detected by a temperature sensor and with reference to a table or the like which is stored in advance.

Motor controller and electric power steering apparatus with temperature detector of the motor

A voltage detectorfor detecting a voltage Vof a batteryas a main power supply and a voltage detectorfor detecting a voltage Vof an auxiliary power supplyare provided. On the basis of an upper limit value Ipreviously defined as the maximum value of current through the battery, a control circuitdefines an upper limit of the electric power supplied to the motoras &#x3b7;&#xb7;V&#xb7;I(&#x3b7; representing the efficiency of the driving circuit) when a first output mode is selected in which the auxiliary power supplyis not used or defines the upper limit of the electric power supplied to the motoras &#x3b7;&#xb7;(V+V)&#xb7;Iwhen a second output mode is selected in which the auxiliary power supplyis used as connected in series with the battery

Growing community of inventors

Nabari, Japan

Shigeki Nagase