Panasonic Corporation

Matsushita Electric Industrial Co., Ltd.

Panasonic Intellectual Property Management Co., Ltd.

Kabushiki Kaisha Toyota Jidoshokki

Hiroshi Murakami

Yuichi Yoshikawa

Yukio Honda

Hu Li

Kiyomi Kawamura

Yoshinari Asano

Shinichiro Kawano

Noriyoshi Nishiyama

Yasufumi Ikkai

Fumitoshi Yamashita

Shizuka Yokote

Tomokazu Nakamura

Atsuyoshi Koshiba

Hisakazu Kataoka

Yasuo Kunishige

Koji Kadowaki

Haruki Kato

Haruhiko Kado

Masayuki Shinto

Hideharu Hiwaki

Yukihiro Okada

Hideo Hirose

Naoyuki Kadoya

Yuichiro Tashiro

Yukitoshi Wada

Yasuaki Matsushita

Hiroki Sato

Kazushige Narazaki

Akihiko Yamazaki

Taro Kishibe

Shinichi Okuyama

Koichi Mitamura

Toshiyuki Tamamura

Osaaki Morino

Hiroshi Ito

Hideki Matsuo

Reiji Tajima

Eiji Hataya

Hideto Inoue

Yasuharu Odachi

Yasutake Seki

Yasushi Kamada

Sunao Hashimoto

Hiroyuki Asai

Ken Suitou

Subrata Saha

Koji Kuyama

Akihiko Watanabe

Hideaki Matsuo

Yasushi Kato

Takashi Ogawa

Hirohito Hayashi

Masahiko Morisaki

Yasuyuki Yokouchi

Yuichi Tanabe

Hiroshi Itoh

Yukinori Nakagawa

Akio Ando

Li Hu

Hiroaki Tanaka

Yuichiro Sadanaga

Takeshi Morishige

Yuuichi Yoshikawa

A motor of this invention comprises a rotor having a permanent magnet, the number of which magnet poles is P, and a stator including M pcs of teeth, the teeth arranged in a circumferential direction in a manner to face the permanent magnet through a spatial gap, wherein the stator includes stator core having the number M of the teeth, and a winding wire wound about each of the tooth, wherein the number P of the magnet poles and the number M of the teeth have a relation defined by formulae (2/3)M&#x3c;P&#x3c;(4/3)M, and M&#x2260;P, and wherein ratio (t1/Ds) of teeth tip width t1 to stator inside diameter Ds is given by a formula 0.18&#x3c;(t1/Ds)&#x3c;0.25.

Motor with rotor and stator dimensions for reducing cogging torque and torque ripple

A motor of this invention comprises a rotor having a permanent magnet, the number of which magnet poles is P, and a stator including M pcs of teeth, the teeth arranged in a circumferential direction in a manner to face the permanent magnet through a spatial gap, wherein the stator includes stator core having the number M of the teeth, and a winding wire wound about each of the tooth, wherein the number P of the magnet poles and the number M of the teeth have a relation defined by formulae (2/3)M&#x3c;P&#x3c;(4/3)M, and M&#x2260;P, and wherein ratio (t/Ds) of teeth tip width tto stator inside diameter Ds is given by a formula 0.18&#x3c;(t/Ds)&#x3c;0.25.

Motor design for reducing cogging torque and torque ripple while maintaining efficiency

Having a stator core including a yoke, a plurality of inside teeth, and a plurality of outside teeth, an inside rotor, and an output rotor, the inside slot open angle/inside pole angle and the outside slot open angle/outside pole angle are determined so that the inside cogging torque due to rotation of the inside rotor and the outside cogging torque due to rotation of the outside rotor may cancel each other in inverted phases. Plural combinations are provided so that the amplitude of inside cogging torque and the amplitude of outside cogging torque due to rotation of outside rotor maybe approximate values in inverted phase, and the combination of the highest combined voltage value of the both induced voltage is selected.

Electric motor having reduced cogging torque

A motor comprising a stator having a plurality of magnetic poles disposed in a circumferential direction along an outer periphery thereof, a rotor disposed rotatably around the outer periphery of the stator, and a magnet disposed in a circumferential direction along an inner periphery of the rotor. The stator is formed by laminating sheet-like plates. A plurality of the sheet-like plates including an outermost layer of this laminated body comprises a flat portion substantially perpendicular to the magnet, and an extended portion bent to a direction substantially parallel to the magnet. A part of the sheet-like plate having the extended portion disposed to the outermost side is formed into a thickness smaller than thicknesses of the other parts.

Motor and electronic device comprising the same

A fan motor includes a pair of fans axially mounted to both sides of a rotary shaft of the motor. The motor includes an inner rotor placed inside a stator wound with windings and an outer rotor placed outside the stator. The motor thus has a dual-rotor structure where the inner rotor and the outer rotor are held such that both the rotors can rotate on the rotary shaft.

Fan motor and blower including the same motor

A clutch mechanism moving together with an actuator allows coupling or decoupling an inner rotor to or from a power shaft, thereby controlling a rotation angle. This structure allows a polarity of a magnetic pole of the inner rotor to be the same as that of an opposing magnetic pole of an outer rotor when the motor is driven at a low rpm, so that magnetic fluxes inter-linking with windings can be increased, which results in greater torque. When the motor is driven at a high rpm, the structure allows the polarity of the magnetic pole of the inner rotor to be different from that of the opposing magnetic pole of the outer rotor, so that an amount of leakage flux is increased, and the magnetic fluxes inter-linking with the winding are decreased. As a result, an induction voltage is lowered and a high rpm range is widened.

Motor

A motor comprises a stator having a plurality of magnetic poles disposed at first predetermined intervals along an outer periphery thereof, and a rotor having a permanent magnet with poles magnetized alternately to have different polarities at second predetermined intervals and disposed rotatably around the outer periphery of the stator with a predetermined gap. The magnetic poles of the stator has extended portions formed in a manner to extend from magnetic polar bases into a direction generally parallel to the permanent magnet, and the extended portions are formed of a high-permeability magnetic steel sheet with silicon content less than 3.0 wt-%.

Motor and electronic device using same

Supposing a straight line joining rotation center O of a rotor and a magnetic pole middle, that is, a middle of permanent magnets () to be a d-axis, and a straight line joining rotation center O and an intermediate point of mutually adjacent permanent magnets () to be a q-axis, mutually adjacent arcs Aand Aare composed such that radius Rof arc Aat the d-axis side is larger than radius Rof arc Aat the q-axis side, and that, at intersection point &#x3b2; of mutual arcs Aand A, angle &#x3b1; of tangent u of arc Aat the q-axis side with respect to tangent t of arc Aat the d-axis side is set by &#x2212;3 degrees&#x2266;&#x3b1;&#x2266;2 degrees.

Permanent magnet buried type electric motor

A process of manufacturing segments, an anisotropic direction of which is continuously changed in a plane vertically by a uniform magnetic field maintained in a constant direction and a process of arranging a plurality of segments on a circumference, extruding the segments in a ring shape by rheology based on the viscous deformation of the segments, from one thrust-direction end surface of the segments, and subsequently compressing the segments from both thrust-direction end surfaces of the segments are necessarily included. A ring magnet, anisotropy of which is controlled in a continuous direction, is provided, and a source for generating a static magnetic field has energy density (BH) max&#x2267;160 to 180 kJ/m.

Manufacturing method of rare earth-iron ring magnet with continuous orientation controlled anisotropy

This motor includes a stator whereupon a plurality of magnetic poles are arranged at first prescribed intervals on the outer circumference section, and a rotor which is rotatively arranged on the outer circumference of the stator by having a prescribed space in between and has permanent magnets magnetized to different polarities at second prescribed intervals. The magnetic pole of the stator forms an extending section which extends from a magnetic pole base section in a direction parallel to the permanent magnet, and the extending length of the extending section in the direction parallel to the permanent magnet is same as that of the magnetic pole base section in the direction parallel to the permanent magnet or shorter.

Brushless DC motor of outer rotor type and electronic device using the same

It comprises stator including stator core having yoke and a plurality of teeth protruded from yoke, which is formed with slots between adjacent teeth, and rotor having rotor core and permanent magnet formed with a plurality of magnetic poles, which confronts tip ends of teeth via gaps, wherein rotor core is formed by rotor core materials circumferentially equally divided into the predetermined number of divisions, and the least common multiple being N for the number of slots and the number of magnetic poles and the least common multiple being M for the number of slots and the number of divisions, then N is equal to M.

Electric motor

A rotor () is an interior permanent magnet rotor formed of a rotor core () in which a plurality of permanent magnets () are embedded at predetermined intervals. First protruding portions () and second protruding portions () are formed on an outer peripheral face of the rotor, the first protruding portions () each opposing the vicinity of a central portion of each of the permanent magnets and having a substantially arc-shaped cross section protruding outward and the second protruding portions () each opposing the vicinity of an end portion of each of the permanent magnets and protruding outward. One first protruding portion and two second protruding portions correspond to one permanent magnet. The formation of the first and second protruding portions as described above on the outer peripheral face of the rotor makes it possible to sufficiently reduce the torque ripple and the noise caused by the distortion of air-gap magnetic flux distribution.

Interior permanent magnet rotor, electric motor using the same and electric device

A dual-rotor motor in which inner slot angle &#x3c6;i is larger than outer slot angle &#x3c6;o. An inner notched portion is provided on both circumferential ends of an inner head. This inner notched portion provides a broader space between the inner head and an inner rotor toward both utmost ends of the inner head. An outer notched portion is provided on both circumferential ends of an outer head. This outer notched portion provides a broader space between the outer head and the outer rotor toward both utmost ends of the outer head.

Dual rotor having varying air gaps

To improve tranquility and controllability of an iron core-equipped permanent magnet motor with an improved maximum energy product (BH)by improving shape compatibility of a radial anisotropic magnet, there is provided a radial anisotropic magnet manufacturing method of fixing magnet powder in a net shape so as to maintain a magnetic anisotropic (C-axis) angle of a magnet with respect to a tangential line and for performing a deformation with a flow so as to have a predetermined circular arc shape or a predetermined annular shape. Particularly, by performing a deformation with a viscous flow or an extension flow, a deformability of the magnet is improved, and thus shape compatibility with respect to a thickness is. improved. A C-axis angle &#x3b8; with respect to a tangential direction is controlled at an arbitrary position and an arbitrary angle so as to reduce cogging torque without separating a magnetic pole into segments.

Radial anisotropic magnet manufacturing method, permanent magnet motor using radial anisotropic magnet, and iron core-equipped permanent magnet motor

Growing community of inventors

Osaka, Japan

Hiroshi Murakami