Source: http://www.google.com/patents/US7821169?dq=U.S.+patent+number+7,325,728&ei=Y93TTteOAe702wW6uqi1BQ
Timestamp: 2017-10-21 13:29:14
Document Index: 325250361

Matched Legal Cases: ['art 20', 'art 20', 'art 20', 'arts 14', 'arts 14', 'arts 15']

Patent US7821169 - Axial gap type motor - Google Patents
A series coupling synchronous axial gap type motor where rotors and stators are alternately stacked with required air gaps in the axial direction of a rotary shaft as a main shaft, is provided. The rotors are fixed to the rotary shaft, and the stators are disposed such that they cannot be interlocked...http://www.google.com/patents/US7821169?utm_source=gb-gplus-sharePatent US7821169 - Axial gap type motor
Publication number US7821169 B2
Application number US 11/793,805
PCT number PCT/JP2005/023130
Also published as CA2592163A1, CA2592163C, CN101088209A, CN101088209B, EP1830454A1, US20080136282, WO2006068042A1
Publication number 11793805, 793805, PCT/2005/23130, PCT/JP/2005/023130, PCT/JP/2005/23130, PCT/JP/5/023130, PCT/JP/5/23130, PCT/JP2005/023130, PCT/JP2005/23130, PCT/JP2005023130, PCT/JP200523130, PCT/JP5/023130, PCT/JP5/23130, PCT/JP5023130, PCT/JP523130, US 7821169 B2, US 7821169B2, US-B2-7821169, US7821169 B2, US7821169B2
Inventors Toru Okazaki, Shingo Ohashi, Hidehiko Sugitomo, Toshio Takeda
Original Assignee Sumitomo Electric Industries, Ltd., Ishikawajima-Harima Heavy Industries Co., Ltd.
Patent Citations (25), Referenced by (11), Classifications (12), Legal Events (2)
US 7821169 B2
A series coupling synchronous axial gap type motor where rotors and stators are alternately stacked with required air gaps in the axial direction of a rotary shaft as a main shaft, is provided. The rotors are fixed to the rotary shaft, and the stators are disposed such that they cannot be interlocked with the rotary shaft. A plurality of rotary field bodies are attached to each of the rotor around the axis, and a plurality of armature coils are made to face the rotary field bodies with an air gap therefrom and are attached to each of the stators around the axis such that their magnetic-flux directions are directed toward the axial direction. The armature coils have an empty core, or a core member composed of a magnetic body attached thereto.
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The present invention relates to an axial gap type motor, and specifically, to a series coupling synchronous high-output motor suitably used as driving sources of vehicles, ships, etc., particularly as motors for propulsion of large ships, such as government and public office ships or passenger ships.
Conventionally, there are a radial gap type motor and an axial gap type motors as motors. As the radial gap type motor, a motor in which a rotor is provided in a hollow part of a stator having an annular cross-section such that the magnetic-flux directions of coils is directed to a radial direction is widely and generally used. Meanwhile, the axial gap type motor, as disclosed in Japanese Unexamined Patent Application Publication No. 2004-140937, is configured such that stators are disposed to face each other in the axial direction of a rotor, and the magnetic-flux directions of coils are directed to the axial direction.
The invention is made in view of the above problem. It is therefore an object of the invention to provide a series coupling synchronous axial gap type motor which makes it possible to reduce the spacing between a stator and a rotor to miniaturize the motor and obtain high output, and to simply achieve assembling with a required small gap between the stator and the rotor.
In order to solve the above problems, according to the invention, there is provided a series coupling synchronous axial gap type motor, including:
the armature coils have an empty core, or a core member composed of a magnetic body (hereinafter referred to as ‘flux collector’) attached thereto.
Further, the rotary field bodies may be formed from a high-temperature superconductive bulk magnet. Even if the high-temperature superconductive bulk magnet is used, a large magnetic field can be formed, and the output of the motor can be increased. This high-temperature superconductive bulk magnet is a magnet that is made of a high-temperature superconductive ingot obtained by dispersing a non-superconductive phase in an RE-Ba—Cu—O high-temperature superconductor to make the phase melt and grow, and that is capable of capturing and magnetizing a larger magnetic field than a high-performance permanent magnet.
As apparent from the above description, according to the invention, the armature coils have an empty core, or a core member composed of a flux collector. Therefore, the armature coils disposed in the stators and the rotary field bodies disposed in the rotors can be arrange close to each other, high output can be obtained, and miniaturization of the motor can be achieved.
FIG. 1 a sectional view showing a motor of a first embodiment of the invention.
10: AXIAL GAP TYPE SUPERCONDUCTING MOTOR
Attachment holes 20 d are provided in the rotor part 20 b at intervals in the peripheral direction around the axis, and permanent magnets 22 are fitted into and fixedly attached to the attachment holes 20 d, respectively, and are disposed such that the directions of magnetic fluxes thereof become the axial direction. Both end faces of the permanent magnets 22 are attached so as to be flush with both end faces of the rotor part 20 b so that the permanent magnets 22 may not project from the rotor part 20 b.
The rotary shaft 30 are made to sequentially pass through through-holes 20 d formed in the axial centers of bearings 20 a of rotor yokes 20 of a plurality of rotors 11, and the plurality of rotors 11 are fixed at predetermined intervals in the axial direction of the rotary shaft 30. Further, a rotary bearing 35 is fitted on the rotary shaft 30 between adjacent rotors 11, and openings of the stators 12 and 13 fit in the position of the rotary bearing 35.
The stators 12 at both axial ends are formed in a symmetrical shape, and the intermediate stators 13 (although one stator is shown in FIG. 1, a number of stators are shown in FIG. 3) have the same shape. The stators 12 and 13 are formed in a disk shape, and as shown in FIG. 2, are split into upper and lower pieces, respectively, so as to provide semi-disk-like upper stators 12 a and 13 a and semi-disk-like lower stators 12 b and 13 b. A plurality of armature coils 24 and 25 made of a normal conductive material are fixed to rotor-facing surfaces of the upper and lower stators 12 a˜13 b at intervals in the peripheral direction around the axis, and are made to project in the axial direction.
The above upper connecting spacer 14 and the lower connecting spacer 15 are formed in a comb tooth shape in which connecting parts 14 b and 15 b are provided so as to project with predetermined spacing therebetween from outer frames 14 a and 15 a. The connecting parts 14 b of the upper connecting spacer 14 are screwed and fixed to the upper stators 12 a and 13 a, and the connecting parts 15 b of the lower connecting spacer 15 are screwed and fixed to the lower stators 12 b and 13 b.
While screw holes are provided in the back surfaces (surfaces opposite to projecting parts of the armature coils) of the stators 12 (upper stators 12 a or lower stators 12 b) at both axial ends, and nuts N are buried in the screw holes, screw holes 16 a and 17 a are provided in the back yokes 16 and 17, screws 19 are inserted into the screw holes, respectively, and screwed into and fixed to the nuts N.
FIG. 6 also shows a modification of the first embodiment in which the shape of a connecting spacer 14′ (15′) is made different. The connecting spacer 14′ is formed in a “U” shape, and connects adjacent stators 13 and 13 (12 and 13) to each other. By sequentially connecting adjacent stators with connecting spacers 14′ in this way, stators corresponding to a difference can be used widely.
The axial gap type motor of the invention is suitably used as power sources, such as large ships or vehicles which require high output. Moreover, the invention can also be suitably used for various industrial purposes, such as power generation equipment.
US7598647 * Dec 16, 2005 Oct 6, 2009 Sumitomo Electric Industries, Ltd. Inductor-type synchronous machine
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JP2004140937A Title not available
JPH0787724A Title not available
JPH03289344A Title not available
JPH08242557A Title not available
JPH09327163A Title not available
JPH10248222A Title not available
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US8362860 * Jan 27, 2010 Jan 29, 2013 Aisin Seiki Kabushiki Kaisha Superconducting apparatus
US9444308 * Dec 29, 2011 Sep 13, 2016 Ta Instruments-Waters L.L.C. Linear motor cooling system
DE102012020434A1 * Oct 18, 2012 Apr 24, 2014 Audi Ag Elektrischer Dämpfer für ein Kraftfahrzeug
DE102012020434B4 * Oct 18, 2012 Sep 8, 2016 Audi Ag Elektrischer Dämpfer für ein Kraftfahrzeug
U.S. Classification 310/156.36, 310/52, 505/166, 310/114
International Classification H02K1/18, H02K55/02, H02K21/24
Cooperative Classification H02K21/24, Y02E40/625, H02K55/04
European Classification H02K55/04, H02K21/24
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:OKAZAKI, TORU;OHASHI, SHINGO;SUGIMOTO, HIDEHIKO;AND OTHERS;REEL/FRAME:019735/0820