Mitsubishi Electric Corporation

Kabushiki Kaisha Toshiba

Nippon Telegraph and Telephone Corporation

Toshiba Electronic Devices & Storage Corporation

Mitsubishi Electric Cornoration

Tatsuya Mori

Akira Furukawa

Isao Kezobo

Kenta Kubo

Hiroko Ikeda

Yoshihiko Kimpara

Kenji Ikeda

Toshihiro Matsunaga

Takayuki Kifuku

Yu Hirotani

Masahiko Orii

Seiji Sawada

Genki Fujii

Tetsuya Kojima

Chiaki Fujimoto

Munenori Yamamoto

Shunsuke Nakajima

Jun Kitagawa

Hiroya Natsuhara

Yuji Takatsuka

Atsushi Ito

Keisuke Ishibashi

Takeru Inoue

Yuya Tsuchimoto

Kenta Tanaka

Kazumichi Sato

Shohei Fujikura

Yasuaki Hori

Mamoru Shiraki

Masashi Iwane

Shigeki Goto

Akihiro Shimoda

Yusuke Takarada

Shigehiro Asano

Satoru Akutsu

Takeshi Yagi

Hidenori Matsuzaki

Yuji Takizawa

Mitsuaki Akiyama

Isao Sonoda

Yu Kawano

Takashi Iwasaki

Yoshihiko Kinpara

Takuya Watanabe

Kodai Okazaki

Takahiro Okanoue

Katsuyuki Kimura

Kenta Motoyoshi

Masaya Sakai

Kazuhiro Hiwada

Rei Araki

Yosuke Sugino

Haruna Koyama

Kenta Sawada

Yuya Takeuchi

Itaru Iki

Tomohiro Tamaru

The redundant resolver includes: a resolver body having a rotor, a stator opposed to the rotor and having Ns teeth arranged in a circumferential direction, and an excitation winding and two phases of output windings wound on the stator; an excitation circuit configured to supply power to the excitation winding; and an angle calculation unit configured to calculate a rotation angle on the basis of signals from the two phases of output windings. The stator is divided in the circumferential direction into M pieces which serve as M tooth blocks, N (M≥N) redundancy systems are formed on the basis of the M tooth blocks. The excitation circuit and the angle calculation unit are provided to each system so as be independent among the systems. Gap magnetic flux densities at both end portions of each tooth block are set to change mildly.

Redundant resolver and electric power steering device mounted therewith

A power converter includes: a multiphase inverter circuit including multiple switching elements; multiple current sensors each of which detects a current of a respective phase of the inverter circuit; a terminal voltage detector that detects a voltage of each terminal of a load connected to the inverter circuit; a switching element drive circuit that controls the switching elements according to a switching pattern given; a fault detector that detects a fault in the inverter circuit or the current sensors; and a fault identifier that, after the fault detector detects the fault, switches the switching pattern to be given to the switching element drive circuit according to types of faults detectable by the fault detector, and identifies a type and a location of the fault based on the value of the current detected or the value of the voltage detected during the control according to the switching pattern.

Power converter and control method for power converter

Provided is a resolver capable of increasing an accuracy of a detected angle of the resolver. The resolver includes: a stator; and a rotor, wherein the rotor includes a plurality of salient poles; wherein the stator includes: a stator core having a plurality of teeth, and a plurality of winding groups each of which is provided on each of the plurality of teeth, wherein the winding groups are divided into two systems, wherein the numbers of turns of the excitation windings are distributed in a form of a sine wave of N-th spatial order, wherein each of the numbers of turns of a first output windings and the numbers of turns of a second output windings are distributed in a form of a sine wave of |N±N|-th spatial order, and wherein the following expressions are satisfied,cos{||(−1)/×2π+α},cos{||(−1)/×2π+β}, and90(deg)<|α−β|<140(deg).

Resolver and electric power steering device

If a current detection resistance is connected between a lower-arm switching element and a negative-electrode-side input terminal of an inverter, a conduction resistance between an output terminal and a positive-electrode-side input terminal of the inverter is set to be higher than a conduction resistance obtained by excluding the current detection resistance from a conduction resistance between the output terminal and the negative-electrode-side input terminal of the inverter. If the current detection resistance is connected between an upper-arm switching element and the positive-electrode-side input terminal, the conduction resistance between the output terminal and the negative-electrode-side input terminal of the inverter is set to be higher than a conduction resistance obtained by excluding the current detection resistance from the conduction resistance between the output terminal and the positive-electrode-side input terminal of the inverter.

Power conversion device and electric power steering device

There has been a problem that a rotation second-order angle error due to a phase difference between a sine signal and a cosine signal deviating from π/2 cannot be reduced. Therefore, provided is an angle detection device that can suppress a second-order angle error caused due to the phase difference between a first sine signal and a second sine signal deviating from π/2, by calculating a detection angle from a first detection signal based on the sum of two sine signals having different phases and a second detection signal based on the difference of the two sine signals.

Angle detection device

An angle detector including; a magnet being mounted on a rotation axle and that has a first track magnetized in P pole-pairs and second track magnetized in Q pole-pairs, a first hole device group that senses magnetic flux from the first track, a second hole device group that senses magnetic flux from the second track, a first detection unit that outputs an M-step absolute angular signal through division of one electric-angle rotation into M sections, a second detection unit that outputs an N-step relative angular signal through division of each of the M divided sections into N sections, an angle calculation unit that divides the one electric-angle rotation into [M×N] sections and calculates an [M×N]-step electric angular signal, based on the absolute angular signal and the relative angular signal, and an angle correction unit that outputs a correction angle supplemented so as to smooth the electric angular signal.

Angle detector, AC-rotating-machine controller, and electric power steering apparatus

A rotating machine control device comprises: a first inverter that applies an alternating-current voltage to three-phase windings of a first system included in a rotating machine, based on a first direct-current voltage that has been output from a direct-current power supply of the first system; a second inverter that applies an alternating-current voltage to three-phase windings of a second system included in the rotating machine, based on a second direct-current voltage that has been output from a direct-current power supply of the second system; a first controller; and a second controller, in that the first controller and the second controller each limit an own system voltage command related to a voltage to be applied to the three-phase windings of an own system by use of a direct-current voltage of an other system, in a case where a direct-current voltage of the own system is higher than the direct-current voltage of the other system, and also generate a value obtained by normalizing the own system voltage command by use of the direct-current voltage of the own system, as a command value to an inverter of the own system.

Rotating machine control device and electric power steering device

To provide a controller for rotary machine which can reduce the effective value of the bus line AC component, by utilizing the degree of freedom that two set of armature windings and two sets of inverters are provided, without necessity to synchronize the on/off control timing of the switching devices of first set, and the on/off control timing of the switching devices of second set. A controller for rotary machine calculates the utilization factor setting command which makes the utilization factor ratio change from 1 to 1 so that an effective value of a bus line AC component which is an AC component superimposed on a bus current which flows through a bus line connecting between the DC power source and the two set of inverters becomes lower than a case where the utilization factor ratio is 1 to 1.

Controller for rotary machine

Provided is a rotation angle detection device including: an intermediate signal generation unit configured to generate an intermediate signal based on a product of a sine signal and a cosine signal which are based on a rotation angle of a rotating body; a first multiplication unit; and a first rotation angle calculation unit. The intermediate signal generation unit includes: a first multiplier configured to calculate the product of the sine signal and the cosine signal; and a first low-pass filter configured to remove frequency components equal to or higher than twice a frequency of fundamental waves of the sine signal and the cosine signal from an output of the first multiplier.

Rotation angle detection device and electric power steering device including same rotation angle detection device

To provide an abnormality detection apparatus for resolver which can determine the abnormality of at least the first system, even if the period of the excitation AC voltage of the first system and the period of the excitation AC voltage of the second system are different periods, and the magnetic interference between systems occurs. An abnormality detection apparatus for resolver applies an AC voltage of a first period to a first system excitation winding; applies an AC voltage of a second period different from the first period to a second system excitation winding; calculates a first system square sum which is a sum of square values of the detection values of output signals of first system two output windings after the second period component reduction processing: and determines abnormality of first system based on whether or not the first system square sum is within a normal range of first system.

Abnormality detection apparatus for resolver

To provide a controller for rotary electric machine and an electric power steering apparatus which can increases decreases an increase amount of the current of d-axis in the negative direction appropriately, and can perform the weakening magnetic flux appropriately, irrespective of increase and decrease in the rotational angle speed, without using the information on the inductance and the interlinkage flux of the rotor. A controller for rotary electric machine, in a case where the current command value of q-axis is a positive value, changes the current command value of d-axis, based on a deviation between an offset q-axis current command value obtained by subtracting the q-axis offset value of the positive value from the current command value of q-axis, and the current detection value of q-axis.

Controller for rotary electric machine and electric power steering apparatus

To provide a controller for rotary electric machine which can suppress the increase in the switching frequency by the voltage for estimation while reducing the estimation delay of the magnetic pole position (the rotational angle). A controller for rotary electric machine turns on and off switching devices which the inverter has and applies voltage to the winding, based on a comparison result between the voltage command and the carrier wave; generates the voltage command for estimation of a preliminarily set one period on a stationary coordinate system fixed to the winding; generates the carrier wave of the same one period as the one period of the voltage command for estimation; extracts the frequency component of the one period of the voltage command for estimation from the current detection value; and estimates a rotational angle based on the frequency component.

Controller for rotary electric machine

A resolver body including a rotor having Nx (Nx is a natural number) salient poles, a stator facing the rotor and having Ns (Ns is an integer equal to or larger than 3) teeth arranged in a circumferential direction, and an excitation winding and two phases of output windings wound on each tooth; and an excitation circuit configured to apply voltage to the excitation winding. The excitation winding and the two phases of output windings wound on each of Nsm (Nsm is an integer equal to or larger than 2) teeth among the Ns teeth are set to be of a main system. The excitation winding and the two phases of output windings wound on each of Ns-Nsm teeth are set to be of a sub-system. The number Nsm of the teeth corresponding to the main system is larger than the number Ns-Nsm of the teeth corresponding to the sub-system.

Redundant resolver and electric power steering device equipped with redundant resolver

To provide a rotary electric machine apparatus which can perform current control which reduces a torque ripple component effectively, using a rotary electric machine in which the permanent magnet of the rotor has the skew structure which shifts the magnetic pole position in the circumferential direction at each position in the axial direction. When defining, as the current vector of most advanced phase, a current vector of current command values calculated on the dq-axis rotating coordinate system of most advanced phase, and defining, as the current vector of middle phase, a current vector of current command values calculated on the dq-axis rotating coordinate system of middle phase, the rotary electric machine apparatus brings a controlling current vector close to the current vector of most advanced phase from the current vector of middle phase, as the winding currents increase.

Rotary electric machine apparatus

To solve a problem that the accuracy of angle detection deteriorates owing to noise voltage generated by eccentricity or variation in shape among rotors according to the number of magnetic poles of a rotor core of a multiple-system rotation sensor, the number S of magnetic poles of a stator core is, with the number R of the magnetic poles of the rotor core and the number N (N is a natural number equal to or larger than 2) of systems for stator windings, in a relationship of S=nRN (n is a natural number), system windings of each system are wound so as to be divided for every R magnetic poles among the S magnetic poles of the stator core, and a winding arrangement of the system windings of each system is made so as to achieve R-times rotational symmetry about a rotor rotation axis.

Multiple-system rotation sensor, and electric power steering device provided with multiple-system rotation sensor

Growing community of inventors

Tokyo, Japan

Tatsuya Mori