US20090179517A1 - Electric motor - Google Patents
Electric motor Download PDFInfo
- Publication number
- US20090179517A1 US20090179517A1 US12/409,897 US40989709A US2009179517A1 US 20090179517 A1 US20090179517 A1 US 20090179517A1 US 40989709 A US40989709 A US 40989709A US 2009179517 A1 US2009179517 A1 US 2009179517A1
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- US
- United States
- Prior art keywords
- stator
- assembly
- rotor
- plates
- stator plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2786—Outer rotors
- H02K1/2787—Outer rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/2789—Outer rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2791—Surface mounted magnets; Inset magnets
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/14—Stator cores with salient poles
- H02K1/146—Stator cores with salient poles consisting of a generally annular yoke with salient poles
- H02K1/148—Sectional cores
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
- H02K21/22—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating around the armatures, e.g. flywheel magnetos
Definitions
- the present invention relates to an electric motor, particularly to an brushless peripheral-rotor electric hub motor in which rotor and stator plates divided in several sections are substituted for a conventional rotor and stator plates in single pieces.
- brushless peripheral-rotor motors in which rotors are placed outside stators, are widely used in hubs of electric vehicles and washing machines.
- Motors of this type have inner stators with a plurality of electric coils connected with power. During operation as an electric generator, a rotating external magnetic field results in the generation of electric current.
- the rotor has a larger diameter than the stator and is provided with a plurality of permanent magnets.
- the rotor is made of a curved rotor plate in which the stator is inserted.
- Various ways of placing the permanent magnets in the rotor are used, which are mainly decided by cost. Accurate positions of the permanent magnets in the rotor plate are important for proper functioning of the motor.
- rotor bodies are made in a single piece on a lathe, with inner peripheral grooves being cut out.
- a permanent magnet is laid into each of the inner peripheral grooves . Since cutting of the inner peripheral grooves and automatic inserting of the permanent magnets is difficult, the permanent magnets are usually glued to an inner periphery of the rotor body. This method, however, is expensive and often results in errors of production. Furthermore, since the permanent magnets are glued to metal, magnetic flux is reduced by some degree.
- rotor plates are produced by punching. Using silicon steel leads to better magnetic properties and a higher magnetic flux. Several rotor plates are inserted in a casing.
- the electric motor of the present invention has a stator and a rotor, both of which have plates that are divided into several sectors.
- the sectors are made by punching at high precision and are automatically assembled, facilitating automatic inserting of permanent magnets.
- FIG. 1 is a front view of the electric motor of the present invention.
- FIG. 2 is a top view of the electric motor of the present invention.
- FIGS. 3 a and 3 b are front and side views of one of the rotor plate sectors of the present invention.
- FIG. 4 is a front view of the rotor plate assembly of the present invention.
- FIG. 5 is a cross-sectional view taken along line 5 - 5 of FIG. 4 .
- FIG. 6 is a partial sectional view of one of the rotor plate sectors and one of the stator plate sectors of the present invention.
- FIGS. 7 a - 7 f are front views of the present invention in other embodiments.
- FIGS. 8 a and 8 b are front and side views of one of the stator plate sectors of the present invention.
- FIG. 9 is a front view of the stator plate assembly of the present invention.
- FIG. 10 is a front view of the rotor plate assembly of the present invention in another embodiment.
- the electric motor of the present invention has a rotor that surrounds a stator, working as a motor or as an electricity generator.
- the following explanation takes a motor used in a hub of an electric vehicle or in a washing machine as an example.
- the electric motor 1 of the present invention comprises: A stator assembly 10 , having electric coils 15 ; and a rotor assembly 20 , having permanent magnets 21 .
- the rotor assembly 20 is made of a plurality of rotor plates stacked on top of each other, and the stator assembly 10 is made of a plurality of stator plates stacked on top of each other.
- the rotor plates and the stator plates are each divided into a plurality of sectors, resulting in easy manufacturing at low cost. In the following, a detailed explanation is given.
- the stator assembly 10 has a stator axle 11 with two ends that are fastened to a stator frame 12 .
- a stator plate sector holder 13 is by a bolt 131 fixed to the stator axle 11 , and is made of material that allows for effective dissipation of heat, like aluminum. Moreover, cooling by gas or liquid is possible to dissipate heat generated in the stator assembly 10 during operation.
- the stator plate sector holder 13 carries a stator sector assembly 14 . Electric coils 15 are wound on plates of the stator sector assembly 14 and on opposite sides fixed thereon.
- the plates of the stator sector assembly 14 are fastened by bolts 16 or screws on fastening plates 17 on the stator plate sector holder 13 .
- the electric coils 15 are supplied with electric currents through holes 111 in the stator axle 11 . Electric current flowing through the electric coils 15 generates a radially oriented magnetic field, which interacts with the magnetic field of the permanent magnets 21 . Gaps are left between the electric coils 15 and the permanent magnets 21 , so that the permanent magnets 21 are able to move unhindered by the stator sector assembly 14 .
- the rotor assembly 20 comprises the permanent magnets 21 , a rotor magnet retainer assembly 22 , and a casing 23 .
- the permanent magnets 21 are mounted on the inward surface of the rotor magnet retainer assembly 22 , and the rotor magnet retainer assembly 22 is fitted into the casing 23 , forming an integral body.
- the casing 23 has two sides that are mounted on a shaft 231 , allowing the rotor assembly freely to rotate on the stator axle 11 .
- a brake drum 24 is attached to an opposite side of the rotor assembly 20 , having a brake shoe (not shown) for stopping a rotating movement of the rotor assembly 20 .
- the permanent magnets 21 are driven by the rotating magnetic field generated by the electric coils 15 .
- the rotating magnetic field of the permanent magnets 21 generates an electric current in the electric coils 15 .
- the rotor magnet retainer assembly 22 comprises a plurality of plates stacked on top of each other.
- Each plate of the rotor magnet retainer assembly 22 consists of at least two rotor plate sectors 221 .
- Each rotor plate sector 221 has two edges connecting to a neighboring rotor plate sector 221 , on which a hook 222 and a groove 223 are respectively placed. Connecting the protrusions 222 and recesses 223 forms a plate, and stacking plates on top of each other forms the rotor magnet retainer assembly 22 .
- Each of the rotor plate sectors 221 has positioning elongated alignment ridges 224 composed of circular, square or other suitable shapes and positioning alignment valleys 224 a at an opposite side, allowing to stack plates on each other, so that the rotor magnet retainer assembly 22 has a predetermined thickness. Furthermore, each of the rotor plate sectors 221 has a inner side in which holding recesses 225 for accommodating the permanent magnets 21 are cut.
- the rotor plate sectors 221 are manufactured by punching, using silicon steel as material for favorable magnetic properties.
- the protrusions 222 and a recess 223 are of any suitable shape. As shown in FIGS. 7 a - 7 d, in various embodiments of the present invention, protrusions 222 a and recesses 223 a of zigzagging shapes, protrusions 222 b and recesses 223 b of embossed shapes, protrusions 222 c and recesses 223 c of linear shapes, or protrusions 222 d and recesses 223 d of waving shapes are used. Furthermore, as shown in FIGS. 7 e and 7 f, a rotor plate sector 221 e accommodates one permanent magnet 21 , or a rotor plate sector 221 f accommodates several permanent magnets 21 .
- the electric coils 15 have a number of magnetic poles that is selected to be compatible with the number of magnetic poles of the permanent magnets 21 , so that a field difference results.
- Each of the electric coils 15 is separately wound on a sector of the stator plate assembly 14 .
- the stator sector assembly 14 has plates that are made of silicon steel with good magnetic properties and are preferably stacked on each other.
- Each plate of the stator sector assembly 14 consists of at least two stator plate sectors 141 .
- Each stator plate sector 141 has two edges connecting to a neighboring stator plate sector 141 , on which a protrusions and a recesses 143 are respectively placed, allowing to fasten neighboring stator plate sectors 141 to each other.
- Each of the stator plate sectors 141 has positioning projections 144 of circular, square or other suitable shapes and positioning depressions 144 a at an opposite side, allowing to stack plates on each other, so that the stator plate assembly 14 has a predetermined thickness.
- Each of the stator plate sectors 141 on the edges thereof has seats 145 , 146 for accommodating one of the electric coils 15 .
- each of the stator plate sectors 141 has a fixing hole 147 , allowing a bolt or a screw to be led through for fastening the stator plate assembly 14 on the stator plate holder 13 .
- a rotor magnet retainer assembly 22 a (permanent magnet seat) is made of elongated shape for use in a linear motor, so that a magnetic bearing of low production cost is formed. Furthermore, the permanent magnets 21 are disposable in a moving part as a well as a fixed part of the motor. In the latter case, rotor plate sectors 221 a are fixed by bolts or screws.
- the present invention has a stator plate assembly and a rotor magnet retainer assembly having single plates which are further divided into sectors. Production thereof by punching is fast and allows for precise and easy accommodating of permanent magnets. Furthermore, waste material during production is minimized, even waste material from other production processes is usable, so that costs are greatly reduced.
Abstract
An electric motor design for hub motors comprises a stator assembly, having an axle, a stator plate sector holder, fixed on the axle, at least one stator sector assembly, mounted on the stator plate holder, and electric coils, would around the plates of the stator plate assembly; and a rotor assembly, having a casing, a rotor magnet retainer assembly, placed inside of the casing, and at least one permanent magnet, mounted on plates of the rotor magnet retainer assembly; wherein the stator sector assembly and/or the rotor magnet retainer assembly have plates which are stacked on top of each other and which are each divided into at least two sectors, saving production cost.
Description
- This application is a continuation application of U.S. patent application Ser. No. 11/034,662 filed on Jan. 12, 2005.
- 1. Field of the Invention
- The present invention relates to an electric motor, particularly to an brushless peripheral-rotor electric hub motor in which rotor and stator plates divided in several sections are substituted for a conventional rotor and stator plates in single pieces. Thereby cost of molding and waste material are greatly reduced and unused material of other processes is usable, resulting in a significant cost advantage.
- 2. Description of Related Art
- In conventional art, brushless peripheral-rotor motors, in which rotors are placed outside stators, are widely used in hubs of electric vehicles and washing machines. Motors of this type have inner stators with a plurality of electric coils connected with power. During operation as an electric generator, a rotating external magnetic field results in the generation of electric current. In each motor of this type, the rotor has a larger diameter than the stator and is provided with a plurality of permanent magnets. Usually, the rotor is made of a curved rotor plate in which the stator is inserted. Various ways of placing the permanent magnets in the rotor are used, which are mainly decided by cost. Accurate positions of the permanent magnets in the rotor plate are important for proper functioning of the motor.
- There are mainly two conventional methods of making rotors. In the first, a rotor body is made in a single piece on a lathe, with inner peripheral grooves being cut out. Into each of the inner peripheral grooves a permanent magnet is laid. Since cutting of the inner peripheral grooves and automatic inserting of the permanent magnets is difficult, the permanent magnets are usually glued to an inner periphery of the rotor body. This method, however, is expensive and often results in errors of production. Furthermore, since the permanent magnets are glued to metal, magnetic flux is reduced by some degree. In the second method, rotor plates are produced by punching. Using silicon steel leads to better magnetic properties and a higher magnetic flux. Several rotor plates are inserted in a casing. By the rotor having several plates, cutting grooves is facilitated and working is easy. Choosing appropriate shapes for the rotor plates results in good magnetic properties and high effectivity in conjunction with the stator coils. However, since the rotor plates have relatively large diameters, large punching machines are required, and punching produces large quantities of waste material, leading to high cost of production.
- It is the object of the present invention to provide an electric motor which is easy to produce and which is manufactured at low cost and with little waste material.
- The electric motor of the present invention has a stator and a rotor, both of which have plates that are divided into several sectors. The sectors are made by punching at high precision and are automatically assembled, facilitating automatic inserting of permanent magnets.
- The present invention can be more fully understood by reference to the following description and accompanying drawings.
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FIG. 1 is a front view of the electric motor of the present invention. -
FIG. 2 is a top view of the electric motor of the present invention. -
FIGS. 3 a and 3 b are front and side views of one of the rotor plate sectors of the present invention. -
FIG. 4 is a front view of the rotor plate assembly of the present invention. -
FIG. 5 is a cross-sectional view taken along line 5-5 ofFIG. 4 . -
FIG. 6 is a partial sectional view of one of the rotor plate sectors and one of the stator plate sectors of the present invention. -
FIGS. 7 a-7 f are front views of the present invention in other embodiments. -
FIGS. 8 a and 8 b are front and side views of one of the stator plate sectors of the present invention. -
FIG. 9 is a front view of the stator plate assembly of the present invention. -
FIG. 10 is a front view of the rotor plate assembly of the present invention in another embodiment. - As shown in
FIGS. 1 and 2 , the electric motor of the present invention has a rotor that surrounds a stator, working as a motor or as an electricity generator. The following explanation takes a motor used in a hub of an electric vehicle or in a washing machine as an example. Theelectric motor 1 of the present invention comprises: Astator assembly 10, havingelectric coils 15; and arotor assembly 20, havingpermanent magnets 21. Therotor assembly 20 is made of a plurality of rotor plates stacked on top of each other, and thestator assembly 10 is made of a plurality of stator plates stacked on top of each other. The rotor plates and the stator plates are each divided into a plurality of sectors, resulting in easy manufacturing at low cost. In the following, a detailed explanation is given. - The
stator assembly 10 has astator axle 11 with two ends that are fastened to astator frame 12. A statorplate sector holder 13 is by abolt 131 fixed to thestator axle 11, and is made of material that allows for effective dissipation of heat, like aluminum. Moreover, cooling by gas or liquid is possible to dissipate heat generated in thestator assembly 10 during operation. The statorplate sector holder 13 carries astator sector assembly 14.Electric coils 15 are wound on plates of thestator sector assembly 14 and on opposite sides fixed thereon. The plates of thestator sector assembly 14 are fastened bybolts 16 or screws onfastening plates 17 on the statorplate sector holder 13. Theelectric coils 15 are supplied with electric currents throughholes 111 in thestator axle 11. Electric current flowing through theelectric coils 15 generates a radially oriented magnetic field, which interacts with the magnetic field of thepermanent magnets 21. Gaps are left between theelectric coils 15 and thepermanent magnets 21, so that thepermanent magnets 21 are able to move unhindered by thestator sector assembly 14. - The
rotor assembly 20 comprises thepermanent magnets 21, a rotormagnet retainer assembly 22, and acasing 23. Thepermanent magnets 21 are mounted on the inward surface of the rotormagnet retainer assembly 22, and the rotormagnet retainer assembly 22 is fitted into thecasing 23, forming an integral body. Thecasing 23 has two sides that are mounted on ashaft 231, allowing the rotor assembly freely to rotate on thestator axle 11. Abrake drum 24 is attached to an opposite side of therotor assembly 20, having a brake shoe (not shown) for stopping a rotating movement of therotor assembly 20. - In the interaction between the
stator assembly 10 and therotor assembly 20, thepermanent magnets 21 are driven by the rotating magnetic field generated by theelectric coils 15. On the other hand, if thecasing 23 is rotated against thestator assembly 10, the rotating magnetic field of thepermanent magnets 21 generates an electric current in theelectric coils 15. - Referring to
FIGS. 3-6 , the rotormagnet retainer assembly 22 comprises a plurality of plates stacked on top of each other. Each plate of the rotormagnet retainer assembly 22 consists of at least tworotor plate sectors 221. Eachrotor plate sector 221 has two edges connecting to a neighboringrotor plate sector 221, on which ahook 222 and agroove 223 are respectively placed. Connecting theprotrusions 222 and recesses 223 forms a plate, and stacking plates on top of each other forms the rotormagnet retainer assembly 22. Each of therotor plate sectors 221 has positioning elongatedalignment ridges 224 composed of circular, square or other suitable shapes andpositioning alignment valleys 224 a at an opposite side, allowing to stack plates on each other, so that the rotormagnet retainer assembly 22 has a predetermined thickness. Furthermore, each of therotor plate sectors 221 has a inner side in which holding recesses 225 for accommodating thepermanent magnets 21 are cut. Therotor plate sectors 221 are manufactured by punching, using silicon steel as material for favorable magnetic properties. - For each of the
rotor plate sectors 221, theprotrusions 222 and arecess 223 are of any suitable shape. As shown inFIGS. 7 a-7 d, in various embodiments of the present invention,protrusions 222 a and recesses 223 a of zigzagging shapes,protrusions 222 b and recesses 223 b of embossed shapes,protrusions 222 c and recesses 223 c of linear shapes, orprotrusions 222 d and recesses 223 d of waving shapes are used. Furthermore, as shown inFIGS. 7 e and 7 f, arotor plate sector 221 e accommodates onepermanent magnet 21, or arotor plate sector 221 f accommodates severalpermanent magnets 21. - Referring to
FIGS. 6 , 8 and 9, theelectric coils 15 have a number of magnetic poles that is selected to be compatible with the number of magnetic poles of thepermanent magnets 21, so that a field difference results. Each of theelectric coils 15 is separately wound on a sector of thestator plate assembly 14. Thestator sector assembly 14 has plates that are made of silicon steel with good magnetic properties and are preferably stacked on each other. Each plate of thestator sector assembly 14 consists of at least twostator plate sectors 141. Eachstator plate sector 141 has two edges connecting to a neighboringstator plate sector 141, on which a protrusions and arecesses 143 are respectively placed, allowing to fasten neighboringstator plate sectors 141 to each other. Each of thestator plate sectors 141 haspositioning projections 144 of circular, square or other suitable shapes and positioningdepressions 144 a at an opposite side, allowing to stack plates on each other, so that thestator plate assembly 14 has a predetermined thickness. Each of thestator plate sectors 141 on the edges thereof hasseats electric coils 15. - Furthermore, each of the
stator plate sectors 141 has a fixinghole 147, allowing a bolt or a screw to be led through for fastening thestator plate assembly 14 on thestator plate holder 13. - Referring to
FIG. 10 , in another embodiment of the present invention, a rotormagnet retainer assembly 22 a (permanent magnet seat) is made of elongated shape for use in a linear motor, so that a magnetic bearing of low production cost is formed. Furthermore, thepermanent magnets 21 are disposable in a moving part as a well as a fixed part of the motor. In the latter case,rotor plate sectors 221 a are fixed by bolts or screws. - To summarize, the present invention has a stator plate assembly and a rotor magnet retainer assembly having single plates which are further divided into sectors. Production thereof by punching is fast and allows for precise and easy accommodating of permanent magnets. Furthermore, waste material during production is minimized, even waste material from other production processes is usable, so that costs are greatly reduced.
- While the invention has been described with reference to preferred embodiments thereof, it is to be understood that modifications or variations may be easily made without departing from the spirit of this invention which is defined by the appended claims.
Claims (6)
1. An electric motor comprising:
a stator assembly, further comprising
a stator axle,
a plurality of electric coils, forming a plurality of electric coil magnetic poles,
a stator plate holder, fixed on said stator axle,
at least one stator plate assembly, mounted on said stator plate holder, having
a plurality of stator plates that are stacked on one another in the axial direction, each of said stator plates being divided into at least two stator plate sectors, each of said stator sector plates having
at least one elongated alignment ridge diametrically oriented on a first major surface,
at least one matching alignment valley opposingly positioned on a second major surface for nesting with said alignment ridge of an adjacent rotor sector plate, thereby maintaining alignment within said stack of stator sector plates, and
at least one fixing hole centrally located for fixing the stacked said stator sector plates to said stator plate holder, and
at least one of said a plurality of electric coils being wound around said stator plates of said stator plate assembly; and
a rotor assembly, further comprising
a casing,
a rotor magnet retainer plate assembly, placed inside of said casing, and
a plurality of permanent magnets, forming a plurality of permanent magnet poles, said plurality of magnet poles being substantially equal in number to the number of said plurality of electric coil magnetic poles, mounted on an inward surface of said rotor magnet retainer assembly.
2. The electric motor according to claim 1 , wherein said stator plate sectors of said stator plate assembly have edges with mating protrusions and recesses to be mutually fitted.
3. The electric motor according to claim 1 , wherein said stator plate sectors of said stator plate assembly have alignment ridges and valleys for stacking plates of said stator plate assembly on each other.
4. The electric motor according to claim 1 , wherein said stator plate assembly has seats for holding said electric coils.
5. The electric motor according to claim 1 , wherein said stator plate sectors have fixing holes, allowing to be fastened to said stator plate holder by bolts or screws.
6. The electric motor according to claim 1 , wherein the number of permanent magnet poles of the rotor magnet retainer plate assembly is 16.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US12/409,897 US20090179517A1 (en) | 2004-12-01 | 2009-03-24 | Electric motor |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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TW093137108A TWI259638B (en) | 2004-12-01 | 2004-12-01 | Structure of an electric motor |
US11/034,662 US7583001B2 (en) | 2004-12-01 | 2005-01-12 | Electric motor design for in hub motors |
US12/409,897 US20090179517A1 (en) | 2004-12-01 | 2009-03-24 | Electric motor |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/034,662 Continuation US7583001B2 (en) | 2004-12-01 | 2005-01-12 | Electric motor design for in hub motors |
Publications (1)
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US20090179517A1 true US20090179517A1 (en) | 2009-07-16 |
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Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
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US11/034,662 Active US7583001B2 (en) | 2004-12-01 | 2005-01-12 | Electric motor design for in hub motors |
US12/409,897 Abandoned US20090179517A1 (en) | 2004-12-01 | 2009-03-24 | Electric motor |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
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US11/034,662 Active US7583001B2 (en) | 2004-12-01 | 2005-01-12 | Electric motor design for in hub motors |
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US (2) | US7583001B2 (en) |
DE (1) | DE102005004133A1 (en) |
TW (1) | TWI259638B (en) |
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Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
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EP2523309A4 (en) * | 2010-02-03 | 2017-06-14 | Toyota Jidosha Kabushiki Kaisha | Stator core |
CN103101600A (en) * | 2011-11-15 | 2013-05-15 | 雅马哈发动机株式会社 | Wheel for a saddle-ride type electric vehicle and saddle-ride type electric vehicle |
US20160118850A1 (en) * | 2013-06-24 | 2016-04-28 | New Motech Co., Ltd. | Stator for motor |
US9929609B2 (en) * | 2013-06-24 | 2018-03-27 | New Motech Co., Ltd. | Stator for motor |
US20170077767A1 (en) * | 2015-09-16 | 2017-03-16 | Yamaha Hatsudoki Kabushiki Kaisha | Electrical rotating machine |
US10263479B2 (en) * | 2015-09-16 | 2019-04-16 | Yamaha Hatsudoki Kabushiki Kaisha | Electrical rotating machine |
US20220006341A1 (en) * | 2018-09-28 | 2022-01-06 | Nidec Corporation | Rotor, method for manufacturing rotor, and motor |
US11949293B2 (en) * | 2018-09-28 | 2024-04-02 | Nidec Corporation | Rotor, method for manufacturing rotor, and motor |
CN110365132A (en) * | 2019-07-02 | 2019-10-22 | 武汉研道科技有限公司 | A kind of built-in outer rotor hub motor of change branch modularization permanent-magnetism for electric vehicle |
Also Published As
Publication number | Publication date |
---|---|
TWI259638B (en) | 2006-08-01 |
US7583001B2 (en) | 2009-09-01 |
US20060113859A1 (en) | 2006-06-01 |
TW200620784A (en) | 2006-06-16 |
DE102005004133A1 (en) | 2006-07-13 |
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