Jtekt Corporation

Kouya Yoshida

Nobuhiro Uchida

Shigeki Nagase

Takeshi Ueda

Motoo Nakai

Naotake Kanda

Kunihiro Oka

Ken Matsubara

Minoru Sentoku

Jun Matsumoto

Shiro Nakano

Hiroshi Sumasu

Hayato Komatsu

Naoki Tani

Takahito Hieda

Naoki Matsumoto

Ryota Umezawa

In a driving unit of an electromechanical motor unit, a semiconductor chip and a smoothing capacitor are joined to a second main surface of a substrate having a first main surface and the second main surface. The semiconductor chip includes a first end portion facing the second main surface, and a second end portion on the opposite side of the semiconductor chip from the first end portion. The smoothing capacitor includes a third end portion facing the second main surface, and a fourth end portion on the opposite side of the smoothing capacitor from the third end portion. The semiconductor chip is thermally connected to a bottom wall portion of a cover member, at a position closer to the second main surface than the fourth end portion is. The bottom wall portion is thermally connected to the motor housing via a sidewall portion of the cover member.

Electromechanical motor unit

An optical nondestructive testing method includes: a laser emitting step involving emitting a heating laser from a laser output device such that the intensity of the heating laser applied to a measurement point changes sinusoidally; a laser intensity measuring step involving measuring the intensity of the heating laser by a phase difference detector; an infrared radiation intensity measuring step involving measuring, by the phase difference detector, the intensity of infrared radiation radiating from the measurement point; a phase difference measuring step involving determining, by the phase difference detector, a phase difference between the intensity of the heating laser and the intensity of the infrared radiation, and outputting the phase difference determined to a determiner from the phase difference detector; and a connection area calculating step involving determining, by the determiner, a connection area in accordance with the phase difference and phase difference-connection area correlation information.

Optical nondestructive testing method and optical nondestructive testing apparatus

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 for driving a brushless motor includes a current detecting unit which detects respective phase currents which flow into the brushless motor; a control calculation unit which calculates instruction values showing respective phase voltages to be applied to the brushless motor, and outputs the instruction values as phase voltage instruction values; a phase resistance calculation unit which calculates respective phase resistance values based on detection values of the respective phase currents detected by the current detecting unit, and the instruction values of the respective phase voltages applied to the brushless motor at the time of the detection of the detection values; a correction unit which corrects the phase voltage instruction values according to the respective phase resistance values calculated by the phase resistance calculation unit; and a driving unit which drives the brushless motor based on the phase voltage instruction values after correction by the correction unit.

Motor control device and electric power steering device

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.

Motor controller and electronic power steering apparatus

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

In a motor control device, a control calculation unit obtains a phase voltage instruction value. A current detecting unit detects an electric current which flows into the brushless motor. A rotational position detecting unit detects the rotational position of a rotor in the brushless motor. A correction unit corrects the phase voltage instruction value based on the detection results of the current detecting unit and the rotational position detecting unit so that a dependency of a ratio on an electric angle shown by a secondary harmonic component of the ratio concerning the electric angle of the brushless motor. The ratio is a ratio of a q-axis or d-axis component of the electric current, which flows into the brushless motor, to a q-axis or d-axis instruction value. A driving unit drives the brushless motor based on the phase voltage instruction value after the correction by the correction unit.

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 vehicle steering apparatus () comprises: a control device () which controls an actuation of an electric motor (); a control housing (H) which partitions an accommodation chamber () which accommodates the control device (); an adjacent housing (A) which is adjacent to the control housing (H); and a heat-conducting member (A;B;C;D;E). The adjacent housing (A) is opposite to the electric motor () with the control housing (H) interposed therebetween. The heat-conducting element (A;B;C;D;E) comprises: an adjacent section () which is adjacent to a heat-generating element () of the control device () so that heat can be conducted; and a connected section (A;B;C;D;E) that is connected to the adjacent housing (A) so that heat can be conducted.

If the magnitude of a command voltage vector is greater than a predetermined voltage value indicated by a voltage limit circle, the magnitude of a voltage vector, which corresponds to a q-axis current and which forms the command voltage vector, is adjusted so that the magnitude of the command voltage vector is equal to or less than the predetermined voltage value. Then a q-axis current estimated value is obtained based on i) the ratio of the magnitude of the voltage vector from the q-axis current after adjustment to the magnitude of the voltage vector from the q-axis current before adjustment, and ii) a q-axis current command value.

Motor control apparatus and electric power steering system

The motor controller drives an electric motor including a rotor as a field magnet and stator coils of U-phase, V-phase and W-phase. The motor controller includes an exploration voltage application unit for applying an exploration voltage to the stator coils of U-phase, V-phase and W-phase such that a voltage vector expressed by the voltage applied to the stator coils rotates in a predetermined cycle with maintaining a constant magnitude, an electric current detection unit for detecting an electric current flowing through the electric motor during the period in which the exploration voltage is applied by the exploration voltage application unit, and a rotor rotation angle estimation unit for estimating a rotation angle of the rotor based on a phase of the voltage vector when a magnitude of the electric current detected by the electric current detection unit takes a local maximum value.

Growing community of inventors

Toyota, Japan

Kouya Yoshida