JP2011229299A - Motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To raise cooling efficiency of a stator by a cooling medium in a motor utilizing square winding wire as a stator coil.SOLUTION: At least a part of a square winding wire 70 is arranged so as to form a projection 24 projected to an end face of a stator core 13 near the stator core 13, and the projection 24 is arranged so as to incline to the stator core 13. The square winding wire 70 is preferably a flat square wire, and a face equivalent to the long side of a cross section of the flat square wire is arranged so as to constitute a top face 71 and a bottom face 71', and the projection 24 is inclined to the stator core 13 so that a cooling medium 32 is transmitted on the top surface 71 to flow to the side of the stator core 13.

Description

  The present invention relates to a motor.

  An example of a general motor will be described. A motor 10 illustrated in FIG. 6 includes a stator 12 as a stator that forms a hollow portion in an inner portion, and a rotor 14 as a rotor that faces the inner portion of the stator 12 and is rotatable about a shaft 16. With.

  The stator 12 includes a stator core 13 and a coil 22 (also referred to as “stator coil”) that winds the stator core 13. In addition, coil ends 22 a and 22 b are formed so as to protrude from both ends of the stator core 13. The coil 22 can be formed by a plurality of windings constituting a plurality of phase coils, such as a three-phase coil including a U-phase coil, a V-phase coil, and a W-phase coil (not shown).

  By the way, in order to suppress overheating of the stator accompanying the operation of the motor, for example, an existing lubricant such as ATF or gear oil is discharged as a cooling medium (refrigerant) toward the coil ends protruding from both end portions of the stator, and cooled. Technology is known. For example, Patent Document 1 discloses a refrigerant discharge port that discharges a cooling medium disposed above a stator.

  In addition, in a motor including such a system configuration, a stator including a coil formed of a so-called spiral winding is known in which a winding is wound in a spiral shape around a stator core (for example, cited document 2) reference).

  On the other hand, for the purpose of improving motor characteristics, a conductive wire having good electrical conductivity such as copper is replaced with a conventional round winding coated with a thin film of enamel resin having an insulating property, for example, and is illustrated in FIG. An attempt has been made to apply a square winding 70 having such a cross-sectional shape to a stator coil. A rectangular winding 70 shown in FIG. 1 includes a conductor 62 having a substantially rectangular cross section and an insulating layer 64 that covers and insulates the outer periphery of the conductor 62. The insulator layer 64 can be formed from a first insulator layer 66 and a second insulator layer 68 in order from the conductor 62 side, if necessary. The first insulator layer 66 can be formed of, for example, enamel resin, and the second insulator layer 68 is higher in rigidity than the first insulator layer 66, such as polyphenylene sulfide (PPS) resin. It can be made of an insulating material with low thermal conductivity.

  In the case of forming the spiral winding as described above, the end portion of each winding is drawn out in the vicinity of the stator core, and is electrically connected to a jumper extending from another winding. When such a spiral winding is formed by using the square winding 70 as shown in FIG. 1, the joint portion between the end portion of the square winding and the end portion of another square winding is the coil end. (See, for example, Patent Document 3). At this time, as illustrated in FIG. 4, there is a case where a protrusion 124 is formed in which a joint (not shown) of the square winding 70 protrudes with respect to the end face 15 of the stator core 13. .

JP 2006-197772 A JP-A-11-266574 JP 2009-219343 A

  FIG. 5 is a schematic view of the stator core 13 and the projections 124 of the square winding 70 shown in FIG. Except for the stator core 13 and the protrusions 124, other configurations are omitted.

  The rectangular winding 70 used as the stator coil is generally a rectangular winding (flat wire) having a long side 171 and a short side 172 in cross section. As illustrated in FIG. 5, the protrusions 124 are usually aligned so that the long side of the cross section of the square winding 70 is parallel to the stator core 13. At this time, the cooling medium 32 discharged from the refrigerant discharge port 30 (see FIG. 4) disposed on the upper portion of the stator core 13 flows down while sequentially passing through the surface of the rectangular winding 70. For this reason, there is a case where the cooling medium 32 hardly winds around the winding portion (not shown) wound around the portion closer to the stator core 13 than the protruding portion 124 and the stator core 13 side, and the cooling efficiency as a whole of the stator is not sufficient. It was possible.

  An object of the present invention is to improve the cooling efficiency of a stator by a cooling medium in a motor using a square winding as a stator coil.

  The configuration of the present invention is as follows.

  (1) A stator core and a coil that is wound around the stator core and is formed of a rectangular winding having a substantially cross-sectional rectangular shape, the stator being disposed so as to form a hollow portion in the inner portion, and the hollow portion A rotor that is disposed and is rotatable to face the stator, and a refrigerant discharge port for discharging a cooling medium that cools the stator above the stator, and the square winding is provided in the stator core. In the vicinity of the stator core, at least a part of the square winding is disposed so as to form a protruding portion protruding from the end surface of the stator core, and the square winding is wound. The motor, wherein the protruding portion of the wire is disposed so as to be inclined with respect to the stator core.

  (2) The rectangular winding is a flat rectangular winding having a long cross-section side and a short cross-section side, and surfaces corresponding to the long cross-section side of the rectangular winding constitute an upper surface and a lower surface. The motor according to (1) above, wherein the motor is disposed and is inclined with respect to the stator core such that the cooling medium flows along the upper surface and flows toward the stator core.

  (3) The motor according to (1) or (2), wherein the protrusion is a joint obtained by electrically joining ends of a plurality of square windings.

  ADVANTAGE OF THE INVENTION According to this invention, in the motor using a square winding as a stator coil, it becomes possible to improve the cooling efficiency of the stator by a cooling medium.

4 is a cross-sectional view for explaining an outline of a configuration of a rectangular winding 70. FIG. It is a figure for demonstrating arrangement | positioning of the stator core 13 and the projection part 24 in embodiment of this invention. FIG. 3 is a side view of FIG. 2. It is a figure for demonstrating arrangement | positioning of the conventional stator core 13 and the projection part 124. FIG. FIG. 5 is a side view of FIG. 4. 2 is a diagram for explaining an outline of a configuration of a motor 10. FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 2 is a diagram for explaining the arrangement of the stator core 13 and the protrusion 24 in the embodiment of the present invention. 4 has substantially the same arrangement relationship as that of FIG. 4 except that a projection 24 is formed in place of the projection 124 of the square winding 70 arranged so as to project with respect to the end face 15 of the stator core 13. Yes.

  The difference between the protrusion 124 and the protrusion 24 will be further described with reference to FIG. FIG. 3 is a schematic diagram viewed from the side focusing on the stator core 13 and the protrusion 24 of the square winding 70 shown in FIG. As in FIG. 5, except for the stator core 13 and the protruding portion 24, other configurations are omitted.

  As shown in FIG. 3, the protrusion 24 is aligned such that the long side of the cross section of the rectangular winding 70 is inclined with respect to the stator core 13 so as to form an upper surface 71 and a lower surface 71 ′. At this time, the cooling medium 32 discharged from the refrigerant discharge port 30 (see FIG. 2) disposed on the upper portion of the stator core 13 flows down while sequentially passing through the surface of the rectangular winding 70, particularly the upper surface 71. At this time, since the protruding portion 24 is arranged to be inclined with respect to the stator core 13, a part of the cooling medium 32 transmitted through the upper surface 71 flows toward the stator core 13 side. For this reason, the cooling medium 32 spreads around the winding portion (not shown) wound around the portion close to the stator core 13 and the stator core 13, and the cooling efficiency of the entire stator is improved.

  As an example of a method for forming the protrusion 24 shown in FIGS. 2 and 3 as an embodiment of the present invention, first, after forming the protrusion 124 as shown in FIGS. It may be inclined so that the cooling medium 32 flows appropriately with respect to the stator core 13 by appropriately twisting the adjacent rectangular winding 70, but is not limited to this. Any method may be used as long as the protrusion 24 as shown in FIG. In addition, the inclination angles of the protrusions 24 with respect to the stator core 13 may be the same or different, but it is preferable that the adjacent protrusions 24 do not contact each other.

  The present invention can be used in a motor using a square winding as a stator coil.

  DESCRIPTION OF SYMBOLS 10 Motor, 12 Stator, 13 Stator core, 14 Rotor, 15 End face, 16 Shaft, 22 Coil, 22a, 22b Coil end, 24, 124 Projection part, 30 Refrigerant discharge port, 32 Cooling medium, 62 Conductor, 64 Insulator layer, 66 1st insulator layer, 68 2nd insulator layer, 70 square winding, 71 upper surface, 71 'lower surface, 171 cross section long side, 172 cross section short side.

Claims (3)

A stator core, and a stator that is wound around the stator core and is formed of a rectangular winding having a substantially cross-sectional rectangular shape, the stator being disposed so as to form a hollow portion in the inner portion;
A rotor disposed in the hollow portion and rotatable to face the stator;
A refrigerant discharge port for discharging a cooling medium for cooling the stator above the stator;
With
The square winding is wound around the stator core in a spiral shape,
In the vicinity of the stator core, at least a part of the square winding is disposed so as to form a protruding portion protruding from the end surface of the stator core,
The motor according to claim 1, wherein the protrusions of the rectangular winding are arranged so as to be inclined with respect to the stator core. The rectangular winding is a rectangular winding having a cross-sectional long side and a cross-sectional short side,
The plane corresponding to the long side of the cross section of the rectangular winding is arranged to constitute an upper surface and a lower surface,
The motor according to claim 1, wherein the protrusion is inclined with respect to the stator core so that the cooling medium flows along the upper surface and flows toward the stator core.   The motor according to claim 1, wherein the protrusion is a joint obtained by electrically joining ends of a plurality of square windings.

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