JP2012034500A - Outer rotor type electric motor - Google Patents

Abstract

An electric motor that can be easily fused without extending the winding length.
At least one of the plurality of insulators 12 is formed with an outer partition wall 28 extending radially outward on one axial end side and provided with a notch penetrating in the axial direction. A neutral point 16 is provided so as to face each other in the axial direction, and the neutral point 16 is held by an insulating grommet 60 fixed to the notch 16c.
[Selection] Figure 2

Description

  The present invention relates to an abduction type electric motor mounted on an electric vehicle.

  As an abduction motor, for example, an electric motor described in Patent Document 1 is known. In the stator of the electric motor of Patent Document 1, each phase coil formed by salient pole concentrated winding is divided into two coil groups, one end of both coil groups is connected to an external connection terminal, and the other side It is disclosed to connect the end of each to a neutral point.

Japanese Patent Laid-Open No. 2002-199638

  However, Patent Document 1 does not specifically disclose at which position of the stator the neutral point is held.

  Further, in an electric motor having a coil formed by distributed winding, a neutral point is fixed to a coil portion on one end side in the axial direction of the stator, but in a salient pole concentrated winding stator, the axial direction of the stator There is a case where the crossing portion is stretched around one end side, and such a configuration may not be adopted.

  Considering the working space of the fusing, it is conceivable to extend the winding to create a neutral point. However, if this is done, the winding cost will increase and the entire motor will become large.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide an abduction type electric motor that can be easily fused without extending the winding length. There is to do.

In order to achieve the above object, the invention according to claim 1
A stator core (e.g., a stator core 11 in an embodiment described later) having a plurality of teeth (e.g., teeth 11b in an embodiment described later) that are arranged at predetermined intervals in the circumferential direction and project radially, and a plurality of teeth provided on the teeth. A plurality of coils (for example, described later) formed by winding an insulator (for example, an insulator 12 in the embodiment described later) and a winding (for example, a para-winding 14 in the embodiment described later) around the outer periphery of the insulator. A three-phase salient pole concentration comprising at least one coil group (for example, a coil group 18 in an embodiment to be described later) in which each phase coil is wound with the same winding. A winding stator (for example, salient pole concentrated winding stators 10 and 10A in an embodiment described later);
An outer rotation type electric motor (for example, an outer rotation type electric motor 1 in an embodiment described later) including an annular rotor (for example, a rotor 4 in an embodiment described later) disposed on the outer peripheral side of the stator, ,
A coil wound around each of the insulators includes a first winding end (for example, a first winding end 41 in an embodiment described later) positioned on the radially outer side on one axial end side of the stator, and an axial direction of the stator. Having a second winding end (for example, a second winding end 42 in an embodiment described later) located on the radially inner side on one end side,
The first winding end of one of the coils adjacent to each other in each coil group and the second winding end of the other are connected by a crossing portion (for example, a crossing portion 14T in an embodiment described later) straddling a coil of a different phase. ,
At least one of the plurality of insulators has a flange portion (for example, an outer partition wall 28 in an embodiment described later) provided with a notch extending radially outward on one end side in the axial direction and penetrating in the axial direction. Formed,
A neutral point (for example, a neutral point 16 in an embodiment described later) is provided so as to face the notch in the axial direction,
An abduction motor, wherein the neutral point is held by an insulating member (for example, a grommet 60 in an embodiment described later) fixed to the notch.

In the invention according to claim 2, in addition to the configuration of claim 1, the coils of each phase are constituted by one coil group wound by the same winding,
Each phase coil group has one end connected to an input / output terminal (for example, a U-phase connection terminal 15u, a V-phase connection terminal 15v, and a W-phase connection terminal 15w in an embodiment described later), and the other end is Connected to a single said neutral point,
The neutral point is held by a single grommet.

In the invention according to claim 3, in addition to the configuration of claim 1, the coils of each phase are each composed of two coil groups around the right direction and around the left direction wound by the same winding.
Each of the two coil groups of each phase has one end connected to the input / output terminal and the other end connected to a single neutral point,
The neutral point is held by a single grommet.

  According to the first aspect of the present invention, the cost of the winding can be minimized without extending the length of the winding to form the neutral point. Moreover, the insulation of a neutral point is ensured by hold | maintaining a neutral point with an insulating member. Further, the fusing can be performed by moving the fusing electrode back and forth in the axial direction through the notch, and a fusing space can be secured and the fusing can be easily performed.

  According to invention of Claim 2 and 3, a neutral point can be collected in one place.

It is a principal part longitudinal cross-sectional view of the abduction motor of 1st Embodiment of this invention. It is a front view of the stator in FIG. It is a front view of a stator core. It is a perspective view of an insulator. It is a front view of an insulator. It is the sectional view on the AA line in FIG. FIG. 6 is a sectional view taken along line BB in FIG. 5. It is a front view of the coil by which the coil | winding was wound by the insulator. It is a principal part enlarged side view of a coil. It is explanatory drawing which shows the process of winding a coil | winding around an insulator. It is a front view which shows the process by which a coil | winding is wound over two or more layers by an insulator. It is explanatory drawing which shows the state which mounts | wears the teeth of a stator core with the insulator by which the coil | winding was wound. It is a principal part perspective view of a neutral point. It is a principal part perspective view of the neutral point which shows the state which omitted the grommet from FIG. It is a perspective view of a grommet. It is a front view of an abduction type electric motor of a 2nd embodiment of the present invention.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.

<First Embodiment>
FIG. 1 is a longitudinal sectional view of an abduction motor according to the present invention. As shown in FIG. 1, the electric motor according to the present embodiment is a three-phase eight-pole pair external rotation type electric motor 1, and includes a stator 10 fixed to a motor housing 2 by bolts 3 and a slight amount on the outer peripheral side of the stator 10. And an annular rotor 4 disposed through a gap.

  In the rotor 4, an annular rotor yoke 6 in which a magnet 6b is embedded in a rotor core 6a formed by laminating electromagnetic steel plates is fixed to an inner peripheral surface 5a of an edge portion of a framed support member 5, and the motor housing 2 is provided. Are fixed to a rotating shaft 8 that is rotatably supported by ball bearings 7 and 7 fitted therein. The rotor 4 is rotationally driven 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 base portion 5 b of the support member 5 and the stator 10.

  2 and 3, the stator 10 includes a stator core 11 and a plurality (24 in this embodiment) of coils 13 (13u, 13v, 13w). The stator core 11 is formed 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. 3, and is formed to project radially outward from the annular support portion 11a. A plurality (24) of teeth 11b are arranged in the circumferential direction. The coil 13 is formed of a predetermined number of conductive wires 14 (in this embodiment, a para-winding composed of two conductive wires, hereinafter referred to as a para-winding) 14 made of a synthetic resin having insulating properties. It is formed by winding around each tooth 11b of the stator core 11 by means of salient pole concentrated winding via the insulator 12 made.

  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.

  Each of the eight coils 13 (U-phase, V-phase and W-phase coils 13u, 13v, 13w) constitutes one coil group 18 (U-phase, V-phase and W-phase coil groups 18u, 18v, 18w). The eight coils 13 (U-phase, V-phase and W-phase coils 13u, 13v, 13w) belonging to each coil group 18 (U-phase, V-phase and W-phase coil groups 18u, 18v, 18w) are the same. It is wound continuously by a para-winding 14 (U-phase, V-phase, and W-phase para-windings 14u, 14v, 14w).

  One end of the U-phase para winding 14u of the U-phase coil group 18u is connected to the U-phase connection terminal 15u, and one end of the V-phase para winding 14v of the V-phase coil group 18v is connected to the V-phase connection terminal 15v. And one end of the W-phase para winding 14w of the W-phase coil group 18w is connected to the W-phase connection terminal 15w. The other end of the para-winding 14 (U-phase, V-phase, and W-phase para-winding 14u, 14u, 14v) of each coil group 18 (U-phase, V-phase, and W-phase coil groups 18u, 18v, 18w). The part is connected to a neutral point terminal 16 a that constitutes the neutral point 16.

  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 support 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).

  As shown in FIGS. 4 to 7, the insulator 12 includes a body portion 24 around which the para-winding 14 is wound, an outer peripheral side flange portion 25 and an inner peripheral side provided at both radial ends of the body portion 24. And a collar portion 26. 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. A plurality of concave grooves 27 for positioning the para-winding 14 when the para-winding 14 is wound are provided in the walls 22 and 23 in a direction orthogonal to the axis of the square hole 24a. .

  An outer partition wall 28 extending outward in the radial direction is formed at the end of the outer peripheral flange 25 on the wall 20 side. An outer winding projecting toward one axial end opposite to the body portion 24 in the axial direction is provided at a corner between one circumferential end surface (left end surface in FIG. 5) 28a and the radially inner side surface 28b of the outer partition wall 28. A support portion 30 is formed. The outer winding support 30 has a side C connecting the radial intermediate portion of the circumferential one end surface 28a of the outer partition wall 28 and a portion of the radially inner side surface 28b that is approximately ３ center from the circumferential end. 28 is formed in a substantially triangular column shape by extending the inner end portion of the circumferential end surface 28a and the inner end portion 28b of the radial inner surface 28b in the axial direction, and the one side C extends in the axial direction. The top of the radially outwardly inclined surface 30c formed by this and the end surface 30d extending in the axial direction from the circumferential end surface 28a of the outer partition wall 28 constitutes a curved surface 30b formed in a curved shape. Yes.

  Further, a step portion 30 a parallel to the one side C is provided between the radially outward inclined surface 30 c of the outer winding support portion 30 and the outer partition wall 28. Furthermore, a guide protrusion 31 having a side surface substantially parallel to the one side C is formed at the intermediate portion in the circumferential direction of the outer partition wall 28 and at the radially inner portion thereof, facing the radially inner portion of the inclined surface 30c. Yes. A groove 32 is formed between the inclined surface 30 c of the outer winding support 30 and the side surface of the guide protrusion 31.

  Moreover, the axial direction one end side part of the inner peripheral side collar part 26 is formed so as to be gradually widened from the one end surface side in the circumferential direction toward the other end surface (right end surface in FIG. 5) when viewed from the radial direction. In addition, as viewed from the axial direction, the thickness is gradually increased from the circumferential intermediate portion toward the other circumferential end surface. A substantially triangular prism-shaped inner winding support 34 that protrudes toward one end in the axial direction is provided at the corner between the other circumferential end surface and the radially outer side surface of the inner circumferential flange 26. In addition, an inclined surface 33 that is inclined inward in the radial direction from the circumferential intermediate portion toward the other circumferential end surface is formed at one axial end side portion of the inner circumferential flange portion 26. A groove portion 35 is formed to face the radially inward inclined surface 34a of the inner winding support portion 34. Further, a parallax that is first wound along the wall 20 from the other end surface side in the circumferential direction to the one end surface side in the circumferential direction at the boundary portion between the axial end portion of the inner peripheral side flange portion 26 and the wall 20. A guide portion 36 that is inclined with respect to the inner peripheral side flange portion 26 that guides the winding 14 is formed, and between the guide portion 36 and the inner peripheral side flange portion 26, a groove portion 35 is connected to the trunk portion. A step portion 36a for guiding the para-winding 14 heading to 24 in the axial direction is formed.

  Further, the outer winding support portion 30 and the inner winding support portion 34 of the insulator 12 are such that a virtual straight line M connecting the outer winding support portion 30 and the inner winding support portion 34 passes through a circumferential intermediate portion of the insulator 12. Therefore, the length of the transition portion 14T can be shortened.

  As shown in FIG. 8, the coil 13 is formed by winding the para-winding 14 around the trunk portion 24 of the insulator 12 a plurality of times. In the coil 13 wound around the trunk portion 24 of the insulator 12, the first winding end 41 is located on the radially outer side of the trunk portion 24, and the second winding end 42 is located on the radially inner side of the trunk portion 24. To position. The para-winding 14 extending from the first winding end 41 toward the crossing portion 14T passes through the groove 32, and the inclined surface 30c is arranged such that the para-winding 14 is axially aligned with the radially outward inclined surface 30c. Along the curved surface 30b of the outer winding support 30 and is locked and supported at the outer support point D. Further, the para-winding 14 extending from the second winding end 42 toward the crossing portion 14T passes through the groove 35 obliquely downward so that the para-winding 14 is axially aligned with the radially inwardly inclined surface 34a, Locked to the inner winding support 34 and supported at the inner support point E. At this time, the outer side winding support part 30 is farther from the coil 13 in the radial direction than the inner side winding support part 34, and the distance from the outermost diameter part of the coil 13 to the outermost diameter part of the outer winding support part 30. H1 is larger than the distance H2 from the innermost diameter portion of the coil 13 to the innermost diameter portion of the inner winding support portion 34. This reliably prevents the para-winding 14 from interfering on the inner diameter side where the space is narrow.

  FIG. 9 is an enlarged side view showing the vicinity of the outer partition wall 28 of the coil. The outer winding support portion 30 and the inner winding support portion 34 protrude outward in the axial direction from the side surface 13a on one end side of the coil 13 in the axial direction. Be placed. The distance X from the side surface 13 a of the wound coil 13 to the step portion 30 a of the outer winding support 30 is set to be longer than the width d of the para-winding 14. Thereby, the 1st winding end 41 side is supported by the outer side support point D of the outer side winding support part 30, and the 2nd winding end 42 side is the inner side of the inner side winding support part 34 of the coil 13 adjacent in the coil 13 of the same phase. Even if the crossover portion 14T supported by the support point E is disposed across the different-phase coil 13, the crossover portion 14T is positioned away from the para-winding 14 of each coil 13 in the axial direction, so that contact is ensured. Is prevented.

  FIG. 10 is an explanatory view showing a state in which the para-winding is wound around the insulator, and a plurality of (in this embodiment, eight) insulators 12 are held at predetermined intervals by the holder 50 with the outer partition wall 28 down. Is done. The para-winding 14 is discharged by a nozzle 51 of a winding device that can rotate and move up and down around the insulator 12, and is wound around the plurality of insulators 12 sequentially.

  Specifically, the nozzle 51 that has finished winding the first winding end 41 of the para-winding 14 around the first insulator 12 </ b> A moves obliquely downward along the shape of the outer winding support 30, and moves the para-winding 14. The para-winding 14 is supported by the outer support point D of the outer winding support 30 by being inserted into the groove 32 and wound around the curved surface 30 b and moving obliquely upward while applying tension. And it moves to the 2nd insulator 12B, the para coil | winding 14 is inserted in the groove part 35 of the inner coil | winding support part 34, is supported by the inner support point E, and the para coil | winding 14 is supplied from the nozzle 51, providing tension | tensile_strength. Derived and wound around the second insulator 12B. Thereafter, the same para-winding 14 is wound around the third to eighth insulators 12 in the same manner.

  As shown in FIG. 11, the para winding 14 is wound around the insulator 12 over a plurality of layers. More specifically, the para-winding 14 that has passed through the groove 35 between the inner winding support 34 and the inclined surface 33 is wound from the upper side to the lower side in the drawing to form the first layer winding 141. (FIG. 11 (a)). When the first layer winding 141 reaches the outer peripheral side flange 25, the second layer winding 142 is located above the first layer winding 141 from the bottom to the top to substantially half the position of the first layer winding 141. The third layer winding 143 is wound on the second layer winding 142 by further reversing the winding direction downward (FIG. 11B), and the outer winding support 30. Through the groove 32 between the winding guide 31 and the winding guide 31, and is guided by the stepped portion 30a and drawn downward (FIG. 11C).

  In this way, the same para-winding 14 is sequentially wound around the plurality of (eight) insulators 12 in succession, so that a plurality of coils 13 continuously wound by the same para-winding 14 can be obtained. A coil group 18 is formed.

  In FIG. 10, the para-winding 14 between the outer support point D of the insulator 12A and the inner support point E of the insulator 12B is a portion that becomes a transition portion 14T (see FIG. 2), and its length L is It is wound in a state set to a predetermined length. In other words, the holder 50 holds the insulator 12 so that the distance between the outer support point D and the inner support point E of the adjacent insulator 12 becomes a predetermined length L, and winds the para-winding 14. Turn.

  Next, assembly of the stator 10 will be described with reference to FIG. U-phase, V-phase, and U-phase, V-phase, and W-phase coil groups 18u, 18v, and 18w composed of a plurality of (eight) coils 13 wound continuously by the same para-winding 14; As shown in FIG. 12, the W-phase coils 13 u, 13 v, and 13 w are arranged in an annular shape radially outward corresponding to the teeth 11 b of the stator core 11. Then, all the coils 13 are simultaneously moved in the direction of reducing the diameter (arrow direction), and the square holes 24 a of the insulator 12 are inserted into the teeth 11 b of the stator core 11.

  Here, when the insulator 12 is inserted radially into the teeth 11b of the stator core 11 and radially outward, the space between the adjacent insulators 12 gradually increases as it goes radially outward. However, as described above, the coil 13 wound around the insulator 12 is formed so that the number of layers wound radially outward from the radially inner side is increased and the radially outer portion is expanded in the circumferential direction. The space is filled with the para-winding 14 without waste, and the space factor can be improved.

  When the coil 13 arranged in an annular shape outward in the radial direction of the stator core 11 moves in the reduced diameter direction, the length in the circumferential direction is shortened, so that the transition portion 14T is slackened, but the stator core is formed in the square hole 24a of the insulator 12. After the 11 teeth 11b are inserted, the transition portion 14T is locked to the outer support point D of the outer winding support portion 30 and the inner support point E of the inner winding support portion 34, as shown in FIG. By bending and forming the transition portion 14T in a substantially S shape, the slack is absorbed and tension is applied to the transition portion 14T.

  Next, one end of the U-phase para-coil 14u of the U-phase coil group 18u disposed on the stator core 11 is connected to the U-phase connection terminal 15u, and similarly, the V-phase para-coil 14v of the V-phase coil group 18v is connected. Is connected to the V-phase connection terminal 15v, and one end of the W-phase para winding 14w of the W-phase coil group 18w is connected to the W-phase connection terminal 15w. Then, the other end of each para-winding 14 (U-phase, V-phase, and W-phase para-winding 14u, 14v, 14w) is connected to a midpoint terminal 16a constituting the neutral point 16 (see FIG. 2). ).

  As a result, each coil 13 is connected to the second winding end 42 of the adjacent coil 13 with the first winding end 41 in the in-phase coil 13 straddling the coil 13 of the different phase via the crossing portion 14T. The stator 10 connected to the phase star is assembled.

  Here, the configuration of the neutral point 16 of the present invention will be described more specifically with reference to FIGS. FIG. 13 is a perspective view of the main part of the neutral point, FIG. 14 is a perspective view of the main part of the neutral point showing a state where the grommet is omitted from FIG. 13, and FIG. 15 is a perspective view of the grommet. 13 and 14, the insulator 12 shows only the insulator 12 provided with the neutral point 16, and the para-winding 14 also includes the para-winding 14 (U phase, V-phase, and W-phase) constituting the neutral point 16. Only the ends of the para-windings 14u, 14v, 14w) are shown.

  The neutral point 16 is disposed so as to be axially adjacent to the outer partition wall 28 of one insulator 12 in the vicinity of each phase connection terminal (U-phase, V-phase and W-phase connection terminals 15u, 15v, 15w). . As shown in FIG. 14, the outer partition wall 28 of the insulator 12 is provided with a substantially semicircular arc-shaped notch 28c penetrating in the axial direction, and the neutral point 16 is accessible from the notch 28c in the axial direction. Thus, the notch 28c and the radial position are substantially equal, and the notch 28c is positioned on one end side in the axial direction.

  The neutral point 16 is a connection terminal (U-phase, V-phase, and W-phase connection terminals 15u, 15v) of each phase of each para-winding 14 (U-phase, V-phase, and W-phase para-windings 14u, 14v, 14w). , 15w), the other ends not connected to each other, that is, six conductors of U-phase, V-phase, and W-phase para-windings 14u, 14v, 14w are arranged in the cylindrical middle point terminal 16a and The intermediate point terminal 16a that is swaged and fused is held by an insulating grommet 60 that is fixed to the notch 28c.

  In the fusing operation, a fusing electrode (not shown) arranged opposite to the axial direction so as to sandwich the notch 28c and the midpoint terminal 16a is used so that the fusing electrode on the notch 28c side crosses the notch 28c. Next, it is performed by advancing and retreating in the axial direction indicated by the arrow in FIG. By applying a current by applying pressure to the cylindrical midpoint terminal 16a containing six conducting wires with the fusing electrode, the resin covering the conducting wire is softened, and the conducting wire is in conduction with the midpoint terminal 16a.

  As shown in FIG. 15, the grommet 60 has a substantially semicircular fixing portion 61 fixed to the notch 28c, and extends from the fixing portion 61 to one end side in the axial direction so as to extend from the radially outer side to the midpoint terminal 16a. And an axial wall 63 extending from the tip of the outer diameter side wall 62 at a substantially right angle inward in the radial direction and covering the midpoint terminal 16a from one end in the axial direction. The outer diameter side wall part 62 and the axial direction wall part 63 are formed in a substantially arc shape along the midpoint terminal 16a. Further, the outer peripheral surfaces of the fixed portion 61 and the outer diameter side wall portion 62 are flush with the outer peripheral surface of the outer partition wall 28. Then, the fixing portion 61 is fixed to the notch 28c by fitting or bonding, so that the fusing midpoint terminal 16a is covered with the grommet 60 and insulated.

  As described above, according to the present embodiment, the insulator 12 is formed with the outer partition wall 28 (flange portion) extending radially outward on one axial end side, and the outer partition wall of at least one insulator 12 is formed. 28 is provided with a notch 28c penetrating in the axial direction. A neutral point 16 is provided so as to face the notch 28c in the axial direction, and the neutral point 16 is held by an insulating grommet 60 (insulating member) fixed to the notch 28c. Therefore, the cost of the winding can be minimized without extending the length of the para-winding 14 to form the neutral point 16. Further, by holding the neutral point 16 with the insulating grommet 60, the insulating property of the neutral point 16 is ensured.

  Further, the fusing can be performed by moving the fusing electrode back and forth in the axial direction through the notch 28c, and a fusing space can be secured and the fusing can be performed easily.

  Further, the coils 13 (U-phase, V-phase, and W-phase coils 13u, 13v, 13w) of each phase have the same para-winding 14 (U-phase, V-phase, and W-phase para-windings 14u, 14v, 14w). 1 coil group 18 (U-phase, V-phase and W-phase coil groups 18u, 18v, 18w), and para-winding 14 (U-phase, V-phase, and W-phase para-winding 14u, 14v, 14w) are connected to a single neutral point 16, and the neutral point 16 is held by a single grommet 60, so that the neutral point 16 can be concentrated in one place.

<Second Embodiment>
Next, an electric motor according to a second embodiment of the present invention will be described with reference to FIG.
In the stator 10A of the electric motor 1 of the second embodiment, each of the eight U-phase, V-phase, and W-phase coils 13u, 13v, and 13w has eight coils each corresponding to a half circumference of the stator core 11. The coils 13 are divided into groups 18 (18u, 18v, 18w), and the coils 13 (four coils for a half circumference) belonging to the same coil group 18 are continuously connected by the same para-windings 14u, 14v, 14w, respectively. It is wound.

  Here, the coil group 18 formed in the counterclockwise direction (coil group positioned on the left side of the boundary line P in FIG. 16) has the same configuration as that of the first embodiment, but is formed in the clockwise direction. The group 18 (coil group located on the right side of the boundary line P in FIG. 16) is different from the first embodiment in the structure of the insulator 12 and how to wind the para-winding 14.

  The insulator 12 that winds the coil 13 of the coil group 18 formed in the clockwise direction has a radial centerline CL (FIG. 5) of the insulator 12 that winds the coil group 18 formed in the counterclockwise direction. The outer winding support portion 30 and the inner winding support portion 34 are formed so as to be line-symmetric with respect to the reference).

  The coil 13 wound around the insulator 12 is wound clockwise as viewed from the outside in the radial direction so that a current flows in the same direction as the coil group 18 formed around the left direction. Therefore, the nozzle 51 has the para-winding 14 inserted into the groove portion 35 and wound around the inner winding support portion 34 to form the first layer winding 141, the second layer winding 142, and the third layer winding 143. Thereafter, the wire is wound around the outer winding support 30 and passes through the groove 32 between the outer winding support 30 and the winding guide 31.

  The neutral point 16 of the stator 10 of the electric motor 1 configured as described above is a position where the coil group 18 formed around the left direction and the coil group 18 formed around the right direction meet, that is, the connection terminals of the respective phases. It is arranged on the opposite side of the (U-phase, V-phase and W-phase connection terminals 15u, 15v, 15w) so as to be close to the outer partition wall 28 of one insulator 12 in the axial direction.

  The outer partition wall 28 of the insulator 12 is provided with a substantially semicircular arc-shaped notch 28c penetrating in the axial direction, and the neutral point 16 is connected to the notch 28c so as to be accessible in the axial direction from the notch 28c. The radial positions are substantially equal and are located on one axial end side of the notch 28c.

  Further, the neutral point 16 is connected to each phase connection terminal (U-phase, V-phase, and W-phase connection terminal 15u) of each para-winding 14 (U-phase, V-phase, and W-phase para-windings 14u, 14v, 14w). , 15v, 15w) are connected to the other end, that is, twelve conductors of the U-phase, V-phase, and W-phase para-windings 14u, 14v, 14w in the cylindrical middle point terminal 16a. The middle point terminal 16a that has been fused is then held by an insulating grommet 60 that is fixed to the notch 28c. The grommet 60 has the same configuration as the grommet 60 of the first embodiment.

  Also in the present embodiment configured as described above, similarly to the first embodiment, the cost of the winding can be minimized without extending the length of the para-winding 14. Moreover, the insulation of the neutral point 16 is ensured by holding with the grommet 60. Furthermore, it is possible to secure the fusing space and perform the fusing easily.

  Further, the coils 13 (U-phase, V-phase, and W-phase coils 13u, 13v, 13w) of the respective phases are respectively connected to the same para-winding 14 (U-phase, V-phase, and W-phase para-windings 14u, 14v, 14w). ) And two coil groups 18 around the right direction and the left direction, and the para-windings 14 (U-phase, V-phase, and W-phase para-windings 14u, 14v, 14w) are single. Since the neutral point 16 is connected to the neutral point 16 and is held by the single grommet 60, the neutral point 16 can be concentrated in one place.

  In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably.

1 External motor (motor)
4 Rotor 10, 10A stator (salient pole concentrated winding stator)
11 Stator core 11b Teeth 12 Insulator 13 Coil 13u U phase coil 13v V phase coil 13w W phase coil 14 Para winding (winding)
14T Crossover 14u U phase para winding 14v V phase para winding 14w W phase para winding 15u U phase connection terminal 15v V phase connection terminal 15w W phase connection terminal 16 Neutral point 18 Coil group 18u U phase coil group 18v V Phase coil group 18w W phase coil group 28 Outer partition (flange)
41 First winding end 42 Second winding end 60 Grommet

Claims (3)

A stator core having a plurality of teeth arranged at predetermined intervals in the circumferential direction and projecting radially, a plurality of insulators provided on the teeth, and a plurality of coils formed by winding a winding around the outer periphery of the insulator And a three-phase salient pole concentrated winding stator comprising at least one coil group in which coils of each phase are wound with the same winding,
An abduction-type electric motor comprising an annular rotor disposed on the outer peripheral side of the stator,
The coil wound around each insulator has a first winding end located on the radially outer side on one axial end side of the stator and a second winding end located on the radially inner side on one axial end side of the stator. And
The first winding end of one of the coils adjacent to each other in each coil group and the second winding end of the other are connected by a bridging portion across the coils of different phases,
At least one of the plurality of insulators is formed with a flange portion extending radially outward on one axial end side and provided with a notch penetrating in the axial direction.
A neutral point is provided so as to face the notch in the axial direction,
An abduction motor, wherein the neutral point is held by an insulating member fixed to the notch. Each phase coil is composed of one coil group wound with the same winding,
Each phase coil group, one end is connected to the input / output terminal, the other end is connected to the single neutral point,
The abduction motor according to claim 1, wherein the neutral point is held by a single grommet. Each phase coil is composed of two coil groups around the right direction and the left direction wound by the same winding,
Each of the two coil groups of each phase has one end connected to the input / output terminal and the other end connected to a single neutral point,
The abduction motor according to claim 1, wherein the neutral point is held by a single grommet.

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