Mitsubishi Electric Corporation

National University Corporation Yokohama National University

Kodai Okazaki

Hiroko Ikeda

Yu Hirotani

Kazumasa Ito

Yoshihiro Miyama

Junji Kitao

Kenta Motoyoshi

Satoru Akutsu

Masatsugu Nakano

Shinichi Yamaguchi

Yuji Takizawa

Koji Kawamura

Hidenori Sasaki

Tatsuya Mori

Seiji Sawada

Moriyuki Hazeyama

Kenji Ikeda

Yusuke Morita

Masafumi Okazaki

Toshihiro Matsunaga

Takashi Umeda

Kenta Kubo

Ryuichi Takiguchi

Kan Akatsu

Tatsuo Nishimura

Tomohira Takahashi

Kosho Yamane

Kengo Kumagai

Shunta Kashima

Tomoya Uchimura

Natsumi Sugi

Yosuke Sugino

Provided is a magnetic gap length estimating device in which neither a current sensor nor a current load is necessary, and a voltage at a connection-wire neutral point does not need to be measured. A magnetic gap length estimating device for estimating a magnetic gap length in an M-group N-phase rotating electric machine to be driven by an inverter includes: a voltage acquiring unit which acquires a no-load-induced line-to-line voltage induced under no load; and a magnetic gap estimating unit. The magnetic gap estimating unit includes: a spectrum analysis unit which converts the no-load-induced line-to-line voltage acquired by the voltage acquiring unit into amplitudes and phases for respective frequencies; a frequency analysis unit which extracts amplitudes and phases of a fundamental wave component and an N-order harmonic component of the no-load-induced line-to-line voltage; and an estimating-and-calculating unit which estimates the magnetic gap length.

Magnetic gap length estimating device, magnetic gap length estimating method, and driving device for rotating electric machine

A rotary electric machine comprises: a rotor which has a rotor core and permanent magnets arranged in the rotor core on its outer circumference side, and which is supported rotatably; and a stator which has a stator core having teeth projecting toward a radial center and arranged circumferentially, and which is located coaxially with the rotor to be spaced apart from the outer circumferential surface of the rotor; wherein, on a condition that a ratio of the circumferential width of each of sub poles to the circumferential width of each of main poles is 0.625 or less, a top width of each of the teeth is set on the basis of two calculation formulas to be used differently according to the rotor skew angle.

Rotary electric machine including rotor with skew and stator in which top width of teeth is set based on skew angle

In the magnetic flux modulation type magnetic gear which uses pole pieces, improvement in demagnetization resistance and suppression of the reduction in torque were issues. Therefore, to the pole pieces provided in a torus shape, a magnetic flux modulation type magnetic gear arranges concentrically a first rotator on the inside of the pole piece and a second rotator on the outside, so that the rotors can be rotated relatively, with the center of the pole pieces as the rotation axis, wherein a first hole part stores, on the inside of the rotator, a first permanent magnet prepared in the rotator, having inclination of a predetermined angle, with respect to the line segment which shows a magnetic pole center, when viewed from the rotation axis. The magnetic gear is configured so as to use the amount of permanent magnets as much as possible.

Magnetic flux modulation type magnetic gear

Provided is a rotating electric machine, including: a stator; and a rotor, wherein the rotor includes: a rotor core having a plurality of holes formed so as to be arranged in a circumferential direction of the rotor; and at least one permanent magnet, wherein the number of magnetic poles of the rotor is 'p', wherein the plurality of holes include a first hole into which the permanent magnet is inserted, and a second hole into which the permanent magnet is not inserted, the first hole including p/2 first holes, the second hole including p/2 second holes, wherein the first hole and the second hole are formed so as to be alternately arranged in the circumferential direction, and wherein the second hole includes a first opening portion that opens to the stator side in a radial direction of the rotor.

Rotating electric machine

A rotor includes a rotor core fixed to a shaft, a pair of magnet slots arranged in a V-shape in the rotor core so as to be separated away from each other toward a radially outer side, permanent magnets inserted into the magnet slots, and a hole provided on the radially outer side of the magnet slots. The distance between each permanent magnet and the hole increases toward the radially outer side. The distance between an outer circumference of the rotor core and the hole is not less than the distance between each magnet slot and the outer circumference of the rotor core.

A resolver device with redundancy, wherein winding groups of different systems are arranged at different positions in a circumferential direction of a stator core. The winding groups of each system include: an excitation winding group consisting of a plurality of excitation windings, each of which is connected to a corresponding one of plural excitation circuits; and a first output winding group; and a second output winding group. Each of the stator teeth has a corresponding one of the excitation windings wound therearound. When two of the excitation windings belonging to different systems, arranged side by side in the circumferential direction of the stator core, are defined as a first end excitation winding and a second end excitation winding, respectively, the first end excitation winding and the second end excitation winding are supplied with excitation signals which generate magnetic fluxes in the same (not opposite) radial directions of the stator core.

Redundancy resolver device and electric power steering device

A rotor core of a rotating electrical machine has interpole bridges each disposed on an outer circumferential side with respect to a permanent magnet in a non-magnetic portion between the poles, and interpole diameter bridges each surrounded by two permanent magnets and an interpole bridge. The outer circumferential surface of each interpole bridge is formed by a first flat surface. Thus, a path of a magnetic flux passing through a magnetic gap is lengthened, so that a q-axis inductance is reduced. In addition, a width in a radial direction of each interpole bridge and a width in a circumferential direction of each interpole diameter bridge are constant, and each interpole bridge and each interpole diameter bridge are disposed so as to be perpendicular to each other to form a T shape. Thus, the concentration of stress during press-fitting of the permanent magnet into a magnet hole can be reduced.

Rotating electrical machine

Provided is a rotating electric machine, including: a stator including: an annular core back; and a plurality of teeth projecting in a radial direction from the core back and being arranged in a circumferential direction, the plurality of teeth having slots each formed between the plurality of teeth adjacent to each other in the circumferential direction; and a rotor including: an annular rotor core which is arranged coaxially with the stator through a magnetic gap; and a plurality of magnetic poles arranged on the rotor core in the circumferential direction, wherein the rotor core includes a plurality of segment cores formed by dividing the rotor core in the circumferential direction with at division surfaces, and wherein the number of segments of the rotor core is different from a divisor and a multiple of the greatest common divisor of the number of poles of the rotor and the number of slots.

A multigroup, multiphase rotary electric machine control device including: a control target calculator to calculate an initial current command value of each phase based on a torque command value; a correction coefficient calculator to calculate a per-group correction coefficient corresponding to each group from a spatial mode M (M is 0 or a positive integer) of an electromagnetic force caused by magnetic flux density variation with respect to a rotational periodicity at the time of rotation of the multigroup, multiphase rotary electric machine; and a current command value corrector to calculate a current command value of the each phase, which is corrected based on the initial current command value and the per-group correction coefficient.

Multigroup-multiphase rotary electrical machine control device and multigroup-multiphase rotary electrical machine drive device

The present invention provides a rotation angle detector capable of detecting a rotation angle of a rotor in the same manner as at normal time even when abnormality such as disconnection or a short circuit occurs, and capable of reducing the number of terminals. When one spatial order cycle of the output winding is an electrical angle of 360&#xb0;, a phase difference between a first output winding and a second output winding and a phase difference between the second output winding and a third output winding are set at an electrical angle &#x3b1;, and &#x3b1;&#x2260;180&#xb0;&#xd7;n (n is an integer).

Rotation angle detector and rotary electric machine

Provided is a rotary electric machine capable of reducing an amount of leakage magnetic flux passing through connecting portions. A cutout portion is formed in the connecting portion so as to be located on a side closer to a magnetic air gap portion. The connecting portion has a slot portion-side thin connecting portion formed so as to be closer to a slot portion than the cutout portion. A slot projecting portion projecting from the slot portion toward the magnetic air gap portion with respect to the slot portion-side thin connecting portion is formed in a portion of the connecting portion that is shifted in the circumferential direction from a portion of the connecting portion in which the slot portion-side thin connecting portion is formed. The slot projecting portion is arranged on each of circumferential sides of the cutout portion.

Rotary electric machine, electric power steering device, and method of manufacturing a rotary electric machine

In the armature winding of a rotary electric machine, in a series coil portion group, the numbers of turns of conducting wire in the coil portions that have an electrical angular phase difference of &#x3b8;that satisfies &#x3b8;&#x3c;&#x3b8;&#x3b8;are different than the numbers of turns of conducting wire in the &#x3b8;and &#x3b8;coil portions, and are also different than the numbers of turns of conducting wire in the coil portions that are adjacent to the &#x3b8;coil portions on two sides in a circumferential direction of the stator core, and phases of the &#x3b8;coil portions are also different than phases of each of the coil portions that are adjacent to the &#x3b8;coil portions on the two sides in the circumferential direction.

Rotary electric machine

A rotary electric machine includes: a rotor; and a stator including: a stator core; and an armature winding that is mounted to the stator core. The armature winding includes by a plurality of identical-phase winding portions in which identical-phase coil portions among coil portions in which conducting wires are wound in concentration onto respective teeth are connected together into a series circuit by crossover wires, and that also have lead wires at two end portions. Each of the lead wires of each of the identical-phase winding portions is led out in a first axial direction of the rotor from coil portions that have identical phase, that are disposed to be adjacent in a circumferential direction of the stator core; and all of the crossover wires of each of the identical-phase winding portions are led out in a second axial direction of the rotor.

Growing community of inventors

Tokyo, Japan

Kodai Okazaki