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`PAGE 4 OF 19
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`PAGE 5 OF 19
`
`

`

`JP-A-10-271721
`
`
`
`(54) [Title of the Invention] OUTER ROTOR TYPE ROTATING MOTOR
`
`
`
`(57) [Abstract]
`
`[Problem] To provide an outer rotor-type rotating motor capable of reducing in
`
`size.
`
`[Means for Resolution] [An outer rotor-type rotating motor] comprises a stator
`
`20 formed by a stator core 12 and a shaft 14 arranged coaxially with the stator
`
`core 12 and so as to be shifted from the stator core 12 in the axial direction, and
`
`a rotor 30 supported by a bearing 15 fitted to the shaft 14 and arranged in a
`
`position facing an outer peripheral portion of the stator core 12.
`
`1
`
`PAGE 6 OF 19
`
`

`

`[Claims]
`
`[Claim 1]
`
`
`
`
`
`An outer rotor-type rotating motor comprising:
`
`a stator constituted by a stator core and a shaft arranged coaxially with
`
`the stator core and so as to be shifted from the stator core in an axial direction;
`
`and
`
`
`
`a rotor supported by a bearing fitted to the shaft and arranged in a
`
`position facing an outer peripheral portion of the stator core.
`
`[Claim 2]
`
`
`
`
`
`The outer rotor-type rotating motor according to claim 1,
`
`wherein the stator is integrally formed by molding the stator core around
`
`which windings are wound and one end side of the shaft by a resin member.
`
`[Claim 3]
`
`
`
`
`
`The outer rotor-type rotating motor according to claim 2,
`
`wherein a projection or a recess is formed on the shaft at a portion
`
`molded by the resin member.
`
`[Claim 4]
`
`
`
`
`
`The outer rotor-type rotating motor according to claim 1,
`
`wherein the stator is constituted by the stator core around which
`
`windings are wound and a shaft formed by allowing part of a resin member for
`
`molding the stator core to protrude.
`
`[Claim 5]
`
`
`
`
`
`The outer rotor-type rotating motor according to claim 4,
`
`wherein a bar-shaped metal member one end of which is fixed to the
`
`center of the stator core is embedded in the center of the shaft.
`
`2
`
`PAGE 7 OF 19
`
`

`

`[Detailed Description of the Invention]
`
`[0001]
`
`[Technical Field to which the Invention Belongs]
`
`
`
`The present invention relates to an outer rotor-type rotating motor in
`
`which a rotor is arranged on an outer peripheral side of a stator, and particularly
`
`relates to a structure of the stator molded by a resin member.
`
`[0002]
`
`[Prior Art]
`
`
`
`Fig. 9 is a cross-sectional view showing the constitution of a outer
`
`rotor-type
`
`rotating motor
`
`in
`
`related art described
`
`in,
`
`for example,
`
`JP-A-3-139143. In the outer rotor-type rotating motor in related art, a rotor 1
`
`and a shaft 2 are fixed by press-fitting, adhesion, aluminum die-casting and the
`
`like, and the shaft 2 is supported by a bearing 4 arranged on an inner diameter
`
`side of a stator 3 as can be seen from the drawing.
`
`[0003]
`
`[Problems that the Invention is to Solve]
`
`
`
`The outer rotor-type rotating motor in related art is configured as
`
`described above, and the shaft 2 penetrates the inner diameter side of the
`
`stator 3, therefore, there are problems that it is difficult to sufficiently obtain a
`
`dimension for the yoke portion of a stator core, that there are constraints on the
`
`shape of a stator coil to be wound around the stator 3 making it necessary to
`
`use extra winding lengths of coil wire. Moreover, in order to obtain a motor
`
`with a uniform airgap and without noise and vibration, there is another problem,
`
`in that machining requires labor because it is necessary to form an inner
`
`diameter of the rotor 1 with high accuracy to be fixed to the shaft 2 accurately
`
`3
`
`PAGE 8 OF 19
`
`

`

`so that axial centers of the inner diameter of the rotor 1 and the outer diameter
`
`of the shaft 2 align, and 2 to obtain accuracy in an installation process of the
`
`rotor 1 and the shaft 2, it is necessary to perform post-processing to the surface
`
`of the rotor 1 which faces the outer peripheral surface of the stator 3 after the
`
`rotor 1 is fixed to the shaft.
`
`[0004]
`
`
`
`The present invention has been made for solving the above problems,
`
`and an object thereof is to provide an outer rotor-type rotating motor capable of
`
`sufficiently securing a yoke portion of a stator core, and capable of optimizing
`
`the circumferential length of stator coil, and of improving machining accuracy
`
`easily.
`
`[0005]
`
`[Means for Solving the Problems]
`
`
`
`An outer rotor-type rotating motor according to claim 1 of the present
`
`invention includes a stator constituted by a stator core and a shaft arranged
`
`coaxially with the stator core and so as to be shifted from the stator core in an
`
`axial direction, and a rotor supported by a bearing fitted to the shaft and
`
`arranged in a position facing an outer peripheral portion of the stator core.
`
`[0006]
`
`
`
`Moreover, in the outer rotor-type rotating motor according to claim 2 of
`
`the present invention, the claim 1 stator may be integrally formed by molding
`
`the stator core around which windings are wound and one end side of the shaft
`
`by a resin member.
`
`[0007]
`
`
`
`Moreover, in the outer rotor-type rotating motor according to claim 3,
`
`4
`
`PAGE 9 OF 19
`
`

`

`the claim 2 projection or recess may be formed on the shaft at a portion molded
`
`by the resin member.
`
`[0008]
`
`
`
`Moreover, in the outer rotor-type rotating motor according to claim 4,
`
`the claim 1 stator may be constituted by the stator core around which windings
`
`are wound, and a shaft formed by allowing part of a resin member for molding
`
`the stator core to protrude.
`
`[0009]
`
`
`
`Moreover, in the outer rotor-type rotating motor according to claim 5,
`
`the claim 4 bar-shaped metal member, one end of which may be fixed to the
`
`center of the stator core, is embedded in the center of the shaft.
`
`[0010]
`
`[Mode of Carrying Out the Invention]
`
`Embodiment 1. Fig. 1 is a cross-sectional view showing the constitution of an
`
`outer rotor-type rotating motor according to Embodiment 1 of the present
`
`invention; Fig. 2 shows the structure of a stator core in Fig. 1, in which (A) is a
`
`plan view and (B) is a front view, Fig. 3 shows a state in which a coil is wound
`
`around the stator core in Fig. 2; (A) is a plan view, (B) is a front cross-sectional
`
`view, and (C) is a side cross-sectional view, and Fig. 4 is a cross-sectional view
`
`showing manufacturing processes of a stator in the outer rotor-type rotating
`
`motor in Fig. 1.
`
`[0011]
`
`
`
`In the drawings, 11 denotes a stator housing formed of, for example,
`
`thermoplastic resin such as polybutylene terephthalate or thermosetting resin
`
`such as unsaturated polyester resin and epoxy resin, which is constituted by,
`
`5
`
`PAGE 10 OF 19
`
`

`

`for example, a flange portion 11a attached to a base (not shown) and the like,
`
`and a main body portion 11b formed so as to protrude to one side from a central
`
`part of the flange portion 11a. 12 denotes a stator core molded inside the main
`
`body portion 11b of the stator housing 11, which is constituted by a yoke portion
`
`12a and eight magnetic pole teeth 12b formed so as to radially protrude around
`
`the yoke portion 12a as shown in Fig. 2.
`
`[0012]
`
`
`
`13 denotes a coil to be wound around the stator core 12 having a
`
`two-pole induction machine winding system, in which a main coil is orthogonal
`
`to an auxiliary coil as shown in Fig. 3. 14 denotes a shaft arranged coaxially
`
`with the stator core 12, one end of which is embedded in a central part of an
`
`end of the main body portion 11b in the stator housing 11. These 11 to 14
`
`configure a stator 20. 15 denotes a bearing fitted to the other end side of the
`
`shaft 14, and 16 denotes a rotor housing supported by the bearing 15 and
`
`formed so as to surround a side portion from the central part of the end of the
`
`main body portion 11b in the stator housing 11, which is formed of thermoplastic
`
`resin or thermosetting resin in the same manner as the stator housing 11. 17
`
`denotes a rotor core molded in a position facing an outer peripheral portion of
`
`the stator core 12 in the rotor housing 16. These 16 and 17 configure a rotor
`
`30. Then, a prescribed number of blades 18 are formed around the rotor
`
`housing 16 to configure a fan.
`
`[0013]
`
`
`
`Next, a method of manufacturing the stator 20 of the outer rotor-type
`
`rotating motor according to Embodiment 1 having the above structure will be
`
`explained with reference to Fig. 4. First, the other end side of the shaft 14 is
`
`6
`
`PAGE 11 OF 19
`
`

`

`fitted into a hole 19b formed on a bottom surface of an concave portion 19a in a
`
`lower mold 19. Subsequently, the stator core 12 around which the coil 13 is
`
`wound is fitted into the concave portion 19a and fixed at a prescribed position.
`
`Then, an upper surface of the lower mold 19 is covered with an upper mold 21
`
`having a concave portion 21a in the above state, and both molds 19 and 21 are
`
`clamped, then, resin is injected into a gap formed by both concave portions 19a
`
`and 21a to perform molding, thereby completing the stator 20.
`
`[0014]
`
`
`
`As the shaft 14 is arranged coaxially with, and so as to be shifted from
`
`the stator core 12 in an axial direction according to the above Embodiment 1,
`
`no space through which the shaft penetrates is necessary in a central part of
`
`the stator core 12. Therefore a sufficient yoke portion 12a can be secured,
`
`and there are no spatial constraints on the shape of the coil 13, in which both
`
`main and auxiliary coils are formed with the shortest routes as can be seen
`
`from Fig. 3, namely, the shape of the coil can be smaller, the height of a coil end
`
`can be lower and the circumferential length of the coil can be shorter relative to
`
`the required winding, and as a result, a the amount of copper wire used can be
`
`reduced and the rotating motor can be reduced in size.
`
`[0015]
`
`
`
`Moreover, after the stator core 12 and one end of the shaft 14 are fitted
`
`into the concave portion 19a and the hole 19b in the lower mold 19 and are
`
`respectively positioned, they are integrated by resin molding. Therefore when
`
`the concave portion 9a and the hole 9b in the lower molding 9 are accurately
`
`formed, concentricity between the outer periphery of the stator core 12 which
`
`faces the rotor 30 and the outer periphery of the shaft 14 fitted to the rotor
`
`7
`
`PAGE 12 OF 19
`
`

`

`housing 16 through the bearing 15 can be obtained with high accuracy, which
`
`can improve machining accuracy easily.
`
`[0016]
`
`Embodiment 2. Fig. 5 is a cross-sectional view showing the constitution of a
`
`stator of an outer rotor-type rotating motor according to Embodiment 2 of the
`
`present invention; Fig. 6 is a cross-sectional view showing the constitution of a
`
`stator of an outer rotor-type rotating motor according to a modification example
`
`different from Fig. 5 in Embodiment 2 of the present invention.
`
`[0017]
`
`
`
`According to Embodiment 2 of the present invention, a projection 22a
`
`and a recess 22b are formed in one end side of a shaft 22 to be embedded in
`
`the main body portion 11b of the stator housing 11 as shown in Fig. 5, therefore
`
`the fixing strength between the shaft 22 and resin of the main body portion 11b
`
`can be increased, and further, a through hole 12c is formed in a central part of
`
`the stator core 12 to extend the shaft 22 to the inside of the through hole 12c as
`
`shown in Fig. 6, thereby improving vibration resistance. In this case, the yoke
`
`portion 12a is reduced by forming the through hole 12c, however, it is sufficient
`
`for the through hole 12c to have just enough diameter to secure a space
`
`through which the shaft 22 penetrates, therefore compared to related art
`
`structures in which large diameter bearings and the like also penetrate, the
`
`effects on performance are small.
`
`[0018]
`
`Embodiment 3. Fig. 7 is a cross-sectional view showing the structure of a stator
`
`of an outer rotor-type rotating motor according to Embodiment 3 of the present
`
`invention, and Fig. 8 is a cross-sectional view showing the constitution of a
`
`8
`
`PAGE 13 OF 19
`
`

`

`stator of an outer rotor-type rotating motor according to a modification example
`
`different from Fig. 7 in Embodiment 3 of the present invention.
`
`[0019]
`
`
`
`According to Embodiment 3 of the present invention, the tip end of the
`
`main body portion 11b of the stator housing 11 protrudes on the same shaft as
`
`the stator core 12 to form a shaft 23 as shown in Fig. 7, therefore, machining of
`
`the shaft 23 can be performed simultaneously with machining of the stator
`
`housing 11, which saves machining labor. Moreover, when a bar-shaped
`
`metal member 24 made of an inexpensive iron material or the like, which
`
`extends to a central part of the stator 12, is embedded in a central part of the
`
`shaft 23 as shown in Fig. 8, the strength of the shaft can be improved without
`
`much increase in costs, and concentricity between the outer periphery of the
`
`stator core 12 and the outer periphery of the shaft 23 can be easily obtained.
`
`[0020]
`
`[Advantage of the Invention]
`
`
`
`As described above, according to claim 1 of the present invention, [the
`
`invention] comprises: a stator constituted by a stator core and a shaft arranged
`
`coaxially with the stator core and so as to be shifted from the stator core in the
`
`axial direction, and a rotor supported by a bearing fitted to the shaft and
`
`arranged in the position facing the outer peripheral portion of the stator core,
`
`therefore, it is possible to provide the outer rotor-type rotating motor capable of
`
`securing a sufficient yoke portion of the stator core, and capable of optimizing
`
`the circumferential length of the stator coil and of reduced size.
`
`[0021]
`
`
`
`Also according to claim 2 of the present invention, the stator is integrally
`
`9
`
`PAGE 14 OF 19
`
`

`

`formed by molding the stator core around which windings are wound and one
`
`end side of the shaft by the resin member in claim 1, therefore, it is possible to
`
`provide an outer rotor-type rotating motor capable not only of reduced size but
`
`also of improving machining accuracy easily.
`
`[0022]
`
`
`
`Also according to claim 3 of the present invention, a projection or
`
`recess is formed on the shaft at a portion molded by the resin member in claim
`
`2, therefore it is possible to provide an outer rotor-type rotating motor not only
`
`capable of reduced size but also of improved vibration resistance.
`
`[0023]
`
`
`
`Also according to claim 4 of the present invention, the claim 1 stator is
`
`constituted by a stator core around which windings are wound and the shaft is
`
`formed by allowing part of the resin member for molding the stator core to
`
`protrude, therefore, it is possible to provide a outer rotor-type rotating motor not
`
`only capable of reduced size but also capable of saving labor.
`
`[0024]
`
`
`
`Also according to claim 5 of the present invention, a bar-shaped metal
`
`member, one end of which is fixed to the center of the stator core, is embedded
`
`in the center of the shaft in claim 4, therefore, it is possible to provide a outer
`
`rotor-type rotating motor not only capable of saving labor but also capable of
`
`improving shaft strength.
`
`[Brief Description of the Drawings]
`
`[Fig. 1] Fig. 1 is a cross-sectional view showing the constitution of an outer
`
`rotor-type rotating motor according to Embodiment 1 of the present invention.
`
`[Fig. 2] Fig. 2 shows a structure of a stator core in Fig. 1, in which (A) is a plan
`
`10
`
`PAGE 15 OF 19
`
`

`

`view and (B) is a front view.
`
`[Fig. 3] Fig. 3 shows a state whereby a coil is wound around the stator core in
`
`Fig. 2, in which (A) is a plan view, (B) is a front cross-sectional view and (C) is a
`
`side cross-sectional view.
`
`[Fig. 4] Fig. 4 is a cross-sectional view showing the manufacturing processes of
`
`a stator of the outer rotor-type rotating motor in Fig. 1.
`
`[Fig. 5] Fig. 5 is a cross-sectional view showing the constitution of a stator of an
`
`outer rotor-type rotating motor according to Embodiment 2 of the present
`
`invention.
`
`[Fig. 6] Fig. 6 is a cross-sectional view showing the constitution of a stator of an
`
`outer rotor-type rotating motor according to a modification example different
`
`from Fig. 5 in Embodiment 2 of the present invention.
`
`[Fig. 7] Fig. 7 is a cross-sectional view showing the constitution of an outer
`
`rotor-type rotating motor according to Embodiment 3 of the present invention.
`
`[Fig. 8] Fig. 8 is a cross-sectional view showing the constitution of a stator of an
`
`outer rotor-type rotating motor according to a modification example different
`
`from Fig. 7 in Embodiment 3 of the present invention.
`
`[Fig. 9] Fig. 9 is a cross-sectional view showing the constitution of an outer
`
`rotor-type rotating motor in related art.
`
`[Description of Reference Numerals and Signs]
`
`11 stator housing, 11a flange portion, 11b main body portion, 12 stator core, 12a
`
`yoke portion, 12b magnetic pole teeth, 12c through hole, 13 coil, 14, 22, 23
`
`shaft, 15 bearing, 22a projection, 22b recess, 16 rotor housing, 17 rotor core,
`
`19 lower mold, 19a, 21a concave portion, 19b hole, 20 stator, 21 upper mold,
`
`24 bar-shaped metal member, 30 rotor
`
`11
`
`PAGE 16 OF 19
`
`

`

`FIG. 1
`
`11: STATOR HOUSING
`
`11a: FLANGE PORTION
`
`11b: MAIN BODY PORTION
`
`12: STATOR CORE
`
`13: COIL
`
`14: SHAFT
`
`15: BEARING
`
`16: ROTOR HOUSING
`
`17: ROTOR CORE
`
`18: BLADE
`
`20: STATOR
`
`30: ROTOR
`
`
`
`FIG. 2 (B)
`
`12: STATOR CORE
`
`12a: YOKE PORTION
`
`12b: MAGNETIC POLE TEETH
`
`
`
`FIG. 3
`
`12: STATOR CORE
`
`13: COIL
`
`
`
`FIG. 4
`
`19: LOWER MOLD
`
`12
`
`PAGE 17 OF 19
`
`

`

`19a, 21a: CONCAVE PORTION
`
`19b: HOLE
`
`21: UPPER MOLD
`
`
`
`FIG. 5
`
`22: SHAFT
`
`22a: PROJECTION
`
`22b: RECESS
`
`
`
`FIG. 6
`
`12: STATOR CORE
`
`12a: YOKE PORTION
`
`12c: THROUGH HOLE
`
`
`
`FIG. 7
`
`23: SHAFT
`
`
`
`FIG. 8
`
`23: SHAFT
`
`24: BAR-SHAPED METAL MEMBER
`
`
`
`13
`
`PAGE 18 OF 19
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`

`

`
`
`CERTIFICATION OF TRANSLATION
`
`
`I, Christopher L. Field, residing at 43 Sherman’s Bridge Rd., Wayland
`MA, 01778, United States of America, declare and state as follows:
`
` I
`
` am well acquainted with the English and Japanese languages. I
`have in the past translated numerous Japanese documents of legal
`and/or technical content into English. I am fully accredited by the
`American Translators Association for Japanese to English translation.
`
`To a copy of this Japanese document I attach an English translation
`and my Certification of Translation. I hereby certify that the English
`translation of the attached document entitled "Japanese Patent
`Application No. JP10-271721, OUTER ROTOR TYPE ROTATING MOTOR
`” is, to the best of my knowledge and ability, an accurate translation.
`
` I
`
` further declare that all statements made herein of my own
`knowledge are true, that all statements made on information and
`belief are believed to be true, and that false statements and the like
`are punishable by fine and imprisonment, or both, under Section
`1001 of Title 18 of the United States Code.
`
`Signed,
`
`
`
`
`
`
`
`
`
`May 30, 2017
`_______________
`Date
`
`
`
`
`
`
`
`
`
`
`________________________
`Christopher Field
`
`
`
`PAGE 19 OF 19
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`