JP2013005653A - Outer rotor type rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an outer rotor type rotary electric machine capable of reducing windage loss during rotation of a rotor.SOLUTION: A tooth 11b has a projection 61 projecting radially outside from the radial outside end face 12a of an insulation bobbin 12. On the radial outside end face 12a of each insulation bobbin 12, a lug member 63 having a circumferential end 63a adjoining the circumferential end face 61a of the projection 61 of the tooth 11b is arranged. The circumferential end 63a of the lug member 63 has a radial width B set substantially equal to or smaller than the radial width A of the projection 61. The lug member 63 is tapered so that the radial width decreases gradually when it is separated from the circumferential end 63a in the circumferential direction of the projection 61.

Description

  The present invention relates to an outer rotor type rotating electrical machine.

  Conventionally, as an outer rotor type rotating electrical machine, a plurality of permanent magnets are arranged on the inner peripheral surface of a rotor yoke, and a rotor coil is driven by a rotating magnetic field generated by the coil by energizing a stator coil that is opposed to the inner side in the radial direction of the rotor. What was comprised so that it might rotate was known.

  For example, as shown in FIGS. 11 and 12, in the outer rotor type rotating electrical machine 100 described in Patent Document 1, a casing 122 is fixed to a casing 121 so as to partially enter the casing 121. A crankshaft 123 (not shown) is coaxially disposed in the sleeve 122 with a bearing 124 and an oil seal 125 interposed between the sleeve 122 and the crankshaft 123. A rotor yoke 126 formed in a bowl shape is coaxially fastened to the end of the crankshaft 123, a magnet 128 is fixed to the inner periphery of the rotor yoke 126, and a cooling fan 129 is fixed to the rotor yoke 126. . A stator 130 is fixed to the end of the sleeve 122 with a bolt 131, and a magnet 128 provided on the rotor yoke 126 coaxially fixes the stator 130 so as to form a slight air gap with the stator 130. Go.

  The stator 130 includes a stator core 132 composed of a plurality of stacked core plates. The stator core 132 has a ring-shaped core base portion 133 and an outer periphery of the core base portion 133. And a plurality of teeth 134 protruding at intervals. Most of the stator core 132 is covered with a bobbin 135 made of synthetic resin, and the bobbin 135 exposes the stator core 132 so that the front end portion of each tooth 134 and part of both end surfaces of the core base portion 133 are exposed. It is formed so as to cover between both axial ends.

  In the case of such an outer rotor type rotating electrical machine, the magnet surface area and the torque arm can be increased as compared with the inner rotor type rotating electrical machine, so that high output can be achieved.

Japanese Patent No. 3866427

  However, in general, an outer rotor type rotating electrical machine has a larger rotor surface area than an inner rotor type rotating electrical machine, and therefore a loss due to disturbance of the air flow during rotor rotation (so-called windage loss). Will increase.

  Further, in the outer rotor type rotating electrical machine 100 described in Patent Document 1, since the tooth 134 is covered with the bobbin 135 so as to expose the tip, the air flow is caused by the step between the tooth 134 and the bobbin 135. Is likely to be disturbed, and the windage loss during the rotation of the rotor may further increase. Further, since the gap 100S exists between the bobbins 135 adjacent in the circumferential direction, the windage loss further increases.

  The present invention has been made in view of the above-described problems, and an object thereof is to provide an outer rotor type rotating electrical machine capable of reducing windage loss during rotor rotation.

In order to achieve the above object, the invention according to claim 1
A substantially annular ring part (for example, an annular part 11a in an embodiment described later) and a plurality of teeth projecting radially outward from the annular part at a predetermined interval in the circumferential direction (for example, an embodiment described later) A stator core (for example, a stator core 11 in an embodiment described later),
An insulating bobbin (for example, an insulating bobbin 12 in an embodiment described later) attached to the teeth;
A stator (for example, a stator 10 in an embodiment described later),
A substantially annular rotor (for example, a rotor 6 in an embodiment described later) opposed to a radially outer side of the stator via a predetermined air gap;
An outer rotor type rotating electrical machine (for example, an outer rotor type rotating electrical machine 1 in an embodiment described later),
The teeth have cross sections that are orthogonal to the radial direction and are formed in substantially the same shape from the radially inner side to the radially outer side, and more than the radially outer end surface of the insulating bobbin (for example, the radially outer end surface 12a in an embodiment described later). A projecting portion projecting radially outward (for example, a projecting portion 61 in an embodiment described later),
On the radially outer end surface of each of the insulating bobbins, a circumferential end portion (for example, in a later-described embodiment) adjacent to a circumferential end surface (for example, a circumferential end surface 61a in the later-described embodiment) of the protruding portion of the teeth. An ear member (for example, an ear member 63 in an embodiment described later) having a circumferential inner end portion 63a) is disposed,
The circumferential end of the ear member has a radial width (for example, radial width B in an embodiment described later) substantially equal to a radial width of the protrusion (for example, radial width A in an embodiment described later). Set to be the same or smaller than the radial width of the protruding portion,
The ear member is formed in a tapered shape in which a radial width is reduced as the protrusion is separated from the projecting portion in the circumferential direction from the circumferential end portion.

In addition to the structure of Claim 1, the invention according to Claim 2
A connecting member (for example, a connecting member 65 in an embodiment described later) that connects the ear members adjacent to each other in the circumferential direction;
The connecting member is characterized by closing at least a part of a gap (for example, a gap S in an embodiment described later) between the radially outer end faces of the insulating bobbins adjacent in the circumferential direction.

In addition to the structure of Claim 2, the invention which concerns on Claim 3 is
The plurality of ear members are connected over the entire circumference by the plurality of connection members,
A radially outer end surface of the ear member (for example, a radially outer end surface 63c in an embodiment described later) and a radially outer end surface of the connecting member (for example, a radially outer end surface 65a in an embodiment described later) are substantially the same. It is formed to have an arc shape with a radius of curvature of.

In addition to the structure according to any one of claims 1 to 3, the invention according to claim 4
The ear member is formed of laminated electromagnetic steel sheets.

In addition to the structure of any one of Claims 1-4, the invention which concerns on Claim 5 is
The rotor includes a substantially annular rotor core (for example, a rotor core 6a in an embodiment described later), and a plurality of magnets (for example, a magnet 6b in an embodiment described later) embedded in the rotor core at a predetermined interval in the circumferential direction. It is characterized by providing.

According to the first aspect of the present invention, the ear member adjacent to the circumferential end surface of the protruding portion of the teeth is disposed on the radially outer end surface of each insulating bobbin, and the ear member adjacent to the circumferential end surface of the protruding portion is disposed. The circumferential end portion is set so that the radial width thereof is substantially the same as or smaller than the radial width of the protruding portion, and the ear member extends from the circumferential end portion to the protruding portion and the circumferential direction. As the distance increases, the radial width decreases. Therefore, the step and the unevenness formed along the rotation direction of the rotor can be reduced on the surface of the stator facing the rotor, and the flow of air generated when the rotor rotates can be rectified. Thereby, the windage loss at the time of rotor rotation can be reduced, and the efficiency of a rotary electric machine can be improved.
Moreover, since the orthogonal cross section with respect to the radial direction is formed in substantially the same shape from the radially inner side to the radially outer side, it is easy to attach the insulating bobbin to the tooth.

  According to the invention of claim 2, the connecting member that connects the ear members adjacent in the circumferential direction is provided so as to close at least a part of the gap between the radially outer end surfaces of the insulating bobbins adjacent in the circumferential direction. Therefore, the gap on the surface of the stator facing the rotor is reduced, and the air flow generated when the rotor rotates can be rectified. Thereby, the windage loss at the time of rotor rotation can be reduced, and the efficiency of the rotating electrical machine can be further improved.

  According to the invention of claim 3, the plurality of ear members are connected over the entire circumference by the plurality of connecting members, and the radially outer end surface of the ear member and the radially outer end surface of the connecting member have substantially the same radius of curvature. Therefore, the air flow generated when the rotor rotates can be rectified. Thereby, the windage loss at the time of rotor rotation can be reduced, and the efficiency of the rotating electrical machine can be further improved.

  According to invention of Claim 4, since it forms with the electromagnetic steel plate with which the ear member was laminated | stacked, it becomes easy to pass a magnetic flux through this ear member with low magnetic resistance. Therefore, even when the coil is wound around each tooth via an insulating bobbin, the magnetic flux passing through the coil is reduced, so that eddy current loss generated in the coil can be reduced. The efficiency of the rotating electrical machine can be further improved.

  According to the invention of claim 5, since the plurality of magnets are embedded in the rotor core at predetermined intervals in the circumferential direction, it is possible to reduce the level difference and unevenness on the surface of the rotor facing the stator, and to reduce windage loss. It becomes possible to reduce.

It is a longitudinal cross-sectional view of the outer rotor type rotary electric machine of this invention. It is a front view of the stator in FIG. It is a rear view of the stator in FIG. It is a perspective view of the stator in FIG. (A) is the fragmentary perspective view of the stator in FIG. 1, (b) is the elements on larger scale of (a). It is a front view of a stator core. It is a perspective view of an insulator. (A) is a perspective view of the 1st coil by which the coil | winding was wound by the insulator, (b) is a perspective view of the 2nd coil by which the coil | winding was wound by the insulator. It is a perspective view which shows the state by which the ear member was connected by the connection member, (a) is the figure seen from radial direction outer side, (b) is the figure seen from radial direction inner side. It is a perspective view of the stator which concerns on the modification of this invention. It is a longitudinal cross-sectional view of the outer rotor type rotary electric machine of the conventional patent document 1. It is a front view of the outer rotor type rotary electric machine in FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.

  FIG. 1 is a longitudinal sectional view of a rotating electrical machine of the present invention. As shown in FIG. 1, the rotating electrical machine of the present embodiment is a three-phase 8-pole pair outer rotor type rotating electrical machine 1, and has a stator 10 fixed to a motor housing 2 with a bolt 3 around an axis O. And a substantially annular rotor 6 opposed to the outside of the stator 10 via a predetermined air gap.

  The rotor 6 includes a substantially annular rotor core 6a formed by laminating electromagnetic steel plates, and a plurality of magnets 6b embedded in the rotor core 6a at predetermined intervals in the circumferential direction. The rotor 6 is fixed to the edge inner peripheral surface 5a of the edged disk-shaped arm member 5, and can rotate integrally with a rotating shaft 8 rotatably supported by ball bearings 7 and 7 fitted in the motor housing 2. It is fixed to. The rotor 6 is driven to rotate by a rotating magnetic field generated in the stator 10. A resolver 9 that detects the magnetic pole position of the rotating shaft 8 is disposed between the rotating shaft 8 and the stator 10.

  2 to 6, the stator 10 includes a stator core 11 and a plurality (24 in this embodiment) of coils 13 (13u, 13v, and 13w). The stator core 11 is configured by laminating a plurality of electromagnetic steel plates in the axial direction of the stator 10, that is, in a direction perpendicular to the paper surface in FIG. 6, and a substantially annular ring portion 11 a and a circumferential direction from the annular portion 11 a. And a plurality of (24) teeth 11b protruding outward in the radial direction at predetermined intervals, and have a substantially annular shape as a whole. A plurality (six in this embodiment) of convex portions 11c each having a bolt hole 17 are formed on the inner peripheral side of the annular portion 11a of the stator core 11. The stator 10 is fixed to the motor housing 2 by the bolt 3 inserted through the bolt hole 17 (see FIG. 1). In addition, the tooth 11b has a rectangular cross section that is substantially the same in shape and has a cross section orthogonal to the radial direction from the radially inner side to the radially outer side.

  The coil 13 is a winding made of a predetermined number of conducting wires (in this embodiment, a bundled wire (para-winding) made up of two conducting wires, hereinafter referred to as a bundled wire) 14 and a synthetic resin having insulating properties. It is formed by winding around each tooth 11b of the stator core 11 by means of concentrated salient pole winding via an insulating bobbin 12 formed by the above method.

  Each of the coils 13 includes eight U-phase, V-phase, and W-phase three-phase coils, and the U-phase coil 13u, the V-phase coil 13v, and the W-phase coil 13w are arranged in this order in the clockwise direction. It is wound around the teeth 11b. That is, the in-phase coils 13 (for example, the U-phase coil 13 u) disposed across the other-phase coils 13 (for example, the V-phase coil 13 v and the W-phase coil 13 w) straddle the other-phase coils 13. It is connected by the crossing part 14T routed.

  As shown in FIG. 7, the insulating bobbin 12 includes a barrel portion 24 around which the bundled wire 14 is wound, and an outer peripheral side flange portion 25 and an inner peripheral side flange portion 26 provided at both radial ends of the barrel portion 24. And having. The body portion 24 has a rectangular hole 24a penetrating in the radial direction by the walls 20 and 21 facing in the axial direction of the stator 10 and the walls 22 and 23 facing in the circumferential direction of the stator 10. It is formed in a cylindrical shape. The size of the square hole 24a is slightly larger than the teeth 11b of the stator core 11, and the teeth 11b can be inserted therethrough. As described above, the tooth 11b has an orthogonal cross section with respect to the radial direction formed in a rectangular shape having substantially the same shape from the radially inner side to the radially outer side, so that the insulating bobbin 12 can be easily attached to the tooth 11b. Is possible. The walls 22 and 23 are provided with a plurality of concave grooves 27 for positioning the bundle wire 14 in the direction orthogonal to the axis of the square hole 24a when the bundle wire 14 is wound. .

  A pair of substantially U-shaped grooves 28 and 29 are formed at the end on the wall 20 side of the outer peripheral flange 25 so as to be spaced apart from each other in the circumferential direction. Moreover, the axial direction one end side part (wall 20 side) of the inner peripheral side collar part 26 is formed in thickness gradually from the circumferential direction intermediate part toward the circumferential direction both end surfaces seeing from the axial direction. Inner winding support portions 31 and 32 having a substantially triangular prism shape projecting toward one end side in the axial direction are provided at corners between both circumferential end surfaces and the radially outer side surface of the inner peripheral flange portion 26. In addition, inclined surfaces 33 and 34 that are inclined radially inward from the circumferential intermediate portion toward both circumferential end surfaces are formed on one axial end side portion of the inner circumferential flange 26. , 34 are opposed to the radially inwardly inclined surfaces 31a, 32a of the inner winding support portions 31, 32 to form groove portions 35, 36.

  Further, at the boundary portion between the axial end portion of the inner peripheral side flange portion 26 and the wall 20, the peripheral end surface side (left end surface in FIG. 7) from the peripheral other end surface side (right end surface in FIG. 7). A guide portion 37 that is inclined with respect to the wall 20 and that guides the bundle wire 14 that is wound first along the wall 20 is formed. The guide portion 37 includes a groove portion 35 to a trunk portion 24. A stepped portion 37a is formed to guide the bundled wire 14 heading in the axial direction.

  The coil 13 is formed by winding the bundle wire 14 a plurality of times around the body portion 24 of the insulating bobbin 12. In the present embodiment, there are two types of coils 13 that are differently wound around the insulating bobbin 12. As shown in FIGS. 8A and 8B, the coil 13 has the first winding end 41 of the coil 13 wound around the body portion 24 of the insulating bobbin 12 positioned on the radially outer side of the body portion 24. The second winding end 42 extends radially outward from the radially inner side of the trunk portion 24 across the coil 13 that is in a different phase. As shown in FIG. 8A, the first coil 13 has a first winding end 41 inserted into the groove 29 on the left side in the figure, and its end 41a is slightly outward in the radial direction from the outer peripheral side flange 25. The length is set so as to protrude. Further, the first coil 13 passes through the groove 35 obliquely downward to the right so that the second winding end 42 is axially aligned with the radially inwardly inclined surface 33 and is locked to the inner winding support 31. The As shown in FIG. 2, the tip of the inner winding support 31 extends outward in the radial direction, and its end 42a is joined to the end 41a of the first winding end 41 of the in-phase coil 13 adjacent in the circumferential direction. Therefore, the length is set so that the end portion 42a slightly protrudes radially outward from the outer peripheral side flange portion 25 in addition to the crossing portion 14T straddling the coil 13 which is a different phase.

  Further, as shown in FIG. 8B, the second coil 13 has a first winding end 41 inserted into the groove 28 on the right side in the figure, and its end 41a is radially outward from the outer peripheral side flange 25. The length is set so as to protrude slightly. Further, the second coil 13 extends the groove 36 obliquely to the lower left so that the second winding end 42 is wound around the inner winding support portion 32 and aligned in the axial direction with the radially inward inclined surface 34. . As shown in FIG. 2, the tip of the inner winding support 32 extends outward in the radial direction, and its end 42a is joined to the end 41a of the first winding end 41 of the coil 13 of the same phase adjacent in the circumferential direction. Therefore, the length is set so that the end portion 42a slightly protrudes radially outward from the outer peripheral side flange portion 25 in addition to the crossing portion 14T straddling the coil 13 which is a different phase.

  Returning to FIG. 2, the eight coils 13 (U-phase, V-phase and W-phase coils 13 u, 13 v, 13 w) for each phase are divided into two coil groups 18 (four corresponding to the half circumference of the stator core 11). 18u, 18v, 18w). That is, the coil 13 of the coil group 18 (a coil group located on the left side of the boundary line P in FIG. 2) formed in the counterclockwise direction with respect to the stator 10 is composed of the first coil 13. On the other hand, the coil 13 of the coil group 18 (coil group positioned on the right side of the boundary line P in FIG. 2) formed clockwise is composed of the second coil 13.

  However, in the embodiment shown in FIG. 2, among the second coils 13 of the coil group 18 formed clockwise with respect to the stator 10, three coils 13 (13 u) connected to a neutral point to be described later. 13v, 13w), the first winding end 41 is inserted into the groove 29 and its end 41a is led upward to facilitate connection with the neutral point. Temporarily, these three coils 13 are called the 3rd coil 13. FIG. Note that all the coils 13 of the coil group 18 formed clockwise with respect to the stator 10 may be constituted by the second coils 13. In this case, the connection with the neutral point is slightly different.

  In FIG. 2, the bundled wire 14 derived from the pair of coils 13 having the same phase arranged closest to both sides of the boundary line P, specifically, the U-phase coil formed counterclockwise with respect to the stator 10. The end portions 42a of the second winding ends 42 of the first U-phase coil 13u of the group 18u and the second U-phase coil 13u of the U-phase coil group 18u formed clockwise with respect to the stator 10 are provided. , U-phase connection terminal 15u.

  Similarly, the end portions 42a of the second winding ends 42 of the pair of V-phase coils 13v arranged closest to both sides of the boundary line P are connected to the V-phase connection terminal 15v, and the first of the pair of W-phase coils 13w An end 42a of the second winding end 42 is connected to the W-phase connection terminal 15w.

  Further, the position where the coil group 18 formed in the counterclockwise direction and the coil group 18 formed in the clockwise direction meet, that is, the connection terminals 15 of each phase (U-phase, V-phase and W-phase connection terminals 15u, 15v). , 15w), the ends 41a of the first winding ends 41 of each phase pair and the six coils 13 arranged on both sides with the boundary line P interposed therebetween are the ends 41a of the adjacent coils 13. These are connected by connection lines 40 to form a neutral point.

  Furthermore, the 2nd winding end 42 of each 1st coil 13 of the coil group 18 formed in the left direction is inserted and latched in the groove part 36 of the adjacent coil 13, and the edge part 42a is circumferential direction. Are joined to the end portion 41a of the first winding end 41 that extends radially outward of the outer peripheral side flange portion 25 of the in-phase coil adjacent to each other.

  Similarly, in the coil 13 of the coil group 18 formed in the clockwise direction, the second winding end 42 of each second coil 13 passes through the groove portion 36 of the insulating bobbin 12 to the groove portion 35 of the adjacent coil 13. Inserted and locked, the end 42 a is joined to the end 41 a of the first winding end 41 extending radially outward of the outer peripheral side flange 25 of the in-phase coil adjacent in the circumferential direction. The joint portion 14 a between the end portion 41 a of the first winding end 41 and the end portion 42 a of the second winding end 42 is covered with an insulating material 50 and fixed to the insulating bobbin 12. The joining process is performed by applying an ultrasonic wave or a high frequency by an ultrasonic welding apparatus, a high frequency welding apparatus (not shown) or the like, and the insulating process solidifies the powder varnish that is the insulating material 50 to join the joint portion 14a. And is fixed to the outer peripheral side flange portion 25 of the insulating bobbin 12.

  Here, the teeth 11b of the present embodiment are, as shown in FIG. 5, a protruding portion 61 that protrudes radially outward from the radially outer end face 12a of the insulating bobbin 12 (the broken line of the teeth 11b in FIG. 5B). (Upper part).

  4 and 9, the radially outer end surface 12a of each insulating bobbin 12 is formed so as to surround the periphery of the protruding portion 61 of the tooth 11b, and the circumferential end surfaces 61a, 61a of the protruding portion 61 are also formed. And the ear member 63 which has the circumferential direction inner side edge parts 63a and 63a and the axial direction inner side edge parts 63b and 63b which adjoin the axial direction both side surfaces 61b and 61b, respectively is arrange | positioned. Here, similarly to the stator core 11, the ear member 63 is composed of electromagnetic steel plates laminated in the axial direction (see FIG. 5B).

  Further, the circumferential inner ends 63a and 63a of the ear member 63 have a radial width B (see FIG. 9) that is substantially the same as the radial width A (see FIG. 5B) of the protrusion 61 (A = B). Further, the ear member 63 is formed in a tapered shape (arc shape) whose radial width decreases as it goes away from the circumferential inner ends 63a, 63a in the circumferential direction, that is, as it is spaced apart from the protrusion 61 in the circumferential direction. Is done.

  As shown in FIG. 4, the ear members 63 adjacent to each other in the circumferential direction are connected by a connecting member 65 made of a resin having a substantially arc shape in cross section. The connecting member 65 is formed so as to surround each of the ear members 63, and more specifically so as to close a part of the gap S between the radially outer end faces 12a of the insulating bobbins 12 adjacent in the circumferential direction. Specifically, the gap S is formed so as to block a portion that does not overlap the insulating material 50 in the circumferential direction. The plurality of ear members 63 are connected to each other by a plurality of connecting members 65, and the radially outer end surface 63c of the ear member 63 and the radially outer end surface 65a of the connecting member 65 are arcs having substantially the same radius of curvature. It is formed to have a shape.

  By providing the ear member 63 and the connecting member 65 in this manner, the radially outer end surface 61c of the protruding portion 61, the radially outer end surface 63c of the ear member 63, the radially outer end surface 65a of the connecting member 65, A surface of the stator 10 facing the rotor 6 is formed as a smooth surface with few steps and irregularities. Therefore, it is possible to prevent the wind flow generated when the rotor is rotated from being disturbed, and the windage loss and NV are improved.

As shown in FIG. 9, the ear member 63 and the connecting member 65 configured as described above include three ear members 63 adjacent in the circumferential direction, and a connecting member 65 that connects the three ear members 63. Are fixed by press-fitting the arc-shaped assembly 67 composed of. In the present embodiment, eight assemblies 67 are press-fitted and fixed to the stator 10 respectively.
Note that the method of fixing the ear member 63 and the connecting member 65 to the stator 10 is not limited to the above-described method, and for example, a plurality of (24 in this embodiment) adjacent to the circumferential direction corresponding to the number of teeth 11b. A linear assembly 67 including an ear member 63 and a connecting member 65 for connecting the plurality of ear members 63 is deformed along the outer peripheral surface of the stator 10 and fixed by press-fitting over the entire periphery. May be. In this case, since the gaps between the assemblies 67 can be reduced as compared with the case where the plurality of assemblies 67 are press-fitted and fixed to the stator 10, the surface of the stator 10 facing the rotor 6 is rotated in the rotational direction of the rotor 6. The level difference and unevenness formed along can be further reduced.

As described above, according to the outer rotor type rotating electrical machine 1 of the present embodiment, the radially outer end surface 12a of each insulating bobbin 12 is adjacent to the circumferential end surfaces 61a and 61a of the protruding portion 61 of the tooth 11b. Ear members 63 having circumferential inner ends 63a, 63a are arranged. Further, the circumferential inner end portions 63a and 63a of the ear member 63 are set so that the radial width B thereof is substantially the same as the radial width A of the protruding portion 61. It is formed in a taper shape in which the radial width decreases as it goes outward in the direction. Therefore, steps and irregularities formed along the rotation direction of the rotor 6 can be reduced on the surface of the stator 10 facing the rotor 6, and the flow of air generated when the rotor 6 rotates can be rectified. . Thereby, the windage loss at the time of rotor 6 rotation can be reduced, and the efficiency of a rotary electric machine can be improved.
Moreover, since the cross section orthogonal to the radial direction of the teeth 11b is formed in substantially the same shape from the radial inner side to the radial outer side, it is easy to attach the insulating bobbin 12 to the teeth 11b.

  Further, according to the outer rotor type rotating electrical machine 1 of the present embodiment, the connecting member 65 that connects the circumferentially adjacent ear members 63 is between the radially outer end faces 12a of the insulating bobbins 12 adjacent in the circumferential direction. Since the gap S on the surface of the stator 10 facing the rotor 6 is reduced, the air flow generated when the rotor 6 rotates can be rectified. . Thereby, the windage loss at the time of rotor 6 rotation can be reduced, and the efficiency of a rotary electric machine can be improved.

  Further, according to the outer rotor type rotating electrical machine 1 of the present embodiment, the plurality of ear members 63 are connected to each other by the plurality of connecting members 65, and the radially outer end surface 63 c of the ear member 63 and the connecting member 65 are connected. Since the radially outer end face 65a is formed to have an arc shape with substantially the same radius of curvature, the flow of air generated when the rotor 6 rotates can be rectified. Thereby, the windage loss at the time of rotor 6 rotation can be reduced, and the efficiency of a rotary electric machine can be improved.

  Further, according to the outer rotor type rotating electrical machine 1 of the present embodiment, since the ear member 63 is formed by the electromagnetic steel plate laminated, the magnetic flux easily passes through the ear member 63 having a low magnetic resistance. Accordingly, since the magnetic flux passing through the coil 13 wound around the teeth 11b via the insulating bobbin 12 is reduced, eddy current loss generated in the coil 13 can be reduced, and the efficiency of the rotating electrical machine can be reduced. Can be improved.

  Further, according to the outer rotor type rotating electrical machine 1 of the present embodiment, since the plurality of magnets 6b are embedded in the rotor core 6a at predetermined intervals in the circumferential direction, the rotor is compared with the case where it is fixed to the surface of the rotor core 6a. Accordingly, the step and the unevenness on the surface facing the stator 10 can be reduced, and further, the windage loss can be reduced.

In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably.
For example, the ear member 63 is not necessarily configured to surround the protrusion 61 of the tooth 11b as in the above-described embodiment (see FIG. 4), and as shown in FIG. What is necessary is just to form so that the circumferential direction end surface 61a may be adjoined. In this case, a pair of ear members 63, 63 adjacent to the circumferential end surfaces 61 a, 61 a of the protruding portion 61 are formed on the radially outer end surface 12 a of each insulating bobbin 12. Even in such a configuration, the step and the unevenness formed along the rotation direction of the rotor 6 are reduced on the surface of the stator 10 facing the rotor 6, and the flow of air generated when the rotor 6 rotates is rectified. Is possible.

  Further, the connecting member 65 is not necessarily provided. In this case, the ear member 63 may be press-fitted and fixed to the radially outer end surface 12a of the insulating bobbin 12 so as to surround the periphery of the protruding portion 61 of the tooth 11b.

  Further, the circumferential inner end portions 63a and 63a of the ear member 63 may be set such that the radial width B thereof is smaller than the radial width A of the protruding portion 61 of the tooth 11b (A> B). .

  The outer rotor type rotating electrical machine of the present invention can also be applied to a surface magnet type motor that fixes a magnet on the rotor surface.

DESCRIPTION OF SYMBOLS 1 Outer rotor type rotary electric machine 6 Rotor 6a Rotor core 6b Magnet 10 Stator 11 Stator core 11a Ring part 11b Teeth 12 Insulating bobbin 12a Radial outer end face 61 Projection part 61a Circumferential end face 61b Axial side face 61c Radial outer end face 63 Ear member 63a Circumferential inner end (circumferential end)
63b Axial inner end portion 63c Radial outer end surface 65 Connecting member 65a Radial outer end surface A Radial width B Radial width S Clearance

Claims (5)

A stator core having a substantially annular ring portion and a plurality of teeth projecting radially outward from the ring portion at a predetermined interval in the circumferential direction;
An insulating bobbin attached to the teeth;
A stator comprising:
A substantially annular rotor facing a radially outer side of the stator via a predetermined air gap;
An outer rotor type rotating electrical machine comprising:
The teeth have a projecting portion in which a cross section perpendicular to the radial direction is formed in substantially the same shape from the radially inner side to the radially outer side, and protrudes radially outward from the radially outer end face of the insulating bobbin,
Ear members having circumferential end portions adjacent to the circumferential end surfaces of the protruding portions of the teeth are arranged on the radially outer end surfaces of the respective insulating bobbins,
The circumferential end of the ear member is set such that its radial width is substantially the same as the radial width of the protruding portion or smaller than the radial width of the protruding portion,
The outer rotor type rotating electrical machine is characterized in that the ear member is formed in a tapered shape whose radial width becomes smaller as it is spaced apart from the projecting portion in the circumferential direction from the circumferential end portion. A connecting member that connects the ear members adjacent to each other in the circumferential direction;
2. The outer rotor type rotating electrical machine according to claim 1, wherein the connecting member closes at least a part of a gap between radially outer end surfaces of the insulating bobbins adjacent in the circumferential direction. The plurality of ear members are connected over the entire circumference by the plurality of connection members,
3. The outer rotor type rotation according to claim 2, wherein a radially outer end surface of the ear member and a radially outer end surface of the coupling member are formed to have an arc shape having substantially the same radius of curvature. Electric. 4. The outer rotor type rotating electrical machine according to claim 1, wherein the ear member is formed of laminated electromagnetic steel plates. 5. The outer according to claim 1, wherein the rotor includes a substantially annular rotor core and a plurality of magnets embedded in the rotor core at a predetermined interval in the circumferential direction. Rotor type rotating electrical machine.

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