JP2003204645A - Motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wiring method for coil connecting wires, which is simple in structure and high in insulation reliability. <P>SOLUTION: Notched portions 70 for guiding connecting wires 40u, 40v, and 40w from coils 30u, 30v, and 30w to a connecting wire housing portion 60 are made different in height by phase. Thus, the connecting wires 40u, 40v, and 40w are prevented from crossing one another, in the connecting wire housing portion 60 in the direction of height. Further, axial ribs 80a are formed on a sidewall 50 of the connecting wire housing portion 60, and the connecting wires 40u, 40v, and 40w are placed thereon. Thus, the wires are prevented from slackening, and a wiring method high in insulating reliability is implemented. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric motor, and more particularly, to a structure of an insulating resin portion of a stator core molded by a covering member made of an insulating resin and a wiring method of a crossover wire of a stator winding.

[0002]

For example, in a stator of a three-phase DC brushless motor having a structure covered with a covering member made of an insulating resin, a crossover wire of a coil of each phase wound on the covering member is provided. Are collectively inserted into a storage portion formed in, for example, a concave groove provided on one end surface of the covering member, or as described in Japanese Patent No. 2942194, one storage portion is provided on one end surface in the axial direction and further in the axial direction. There is known a structure in which the second and third storage parts are provided side by side on the end face, and the connecting wire of each phase coil is separately inserted into the respective storage parts.

However, in the first method, since all the crossover wires are inserted in the grooves of the same housing portion, there is a possibility that dielectric breakdown may occur between coils of different phases. Also,
In the second method, since the crossover wire is inserted separately for each phase, there is little risk of dielectric breakdown, but instead a storage section for inserting the crossover wire for each phase is required,
It has a defect that the shape of the stator becomes large. The present invention provides a method for wiring a coil crossover wire with a simple structure and high insulation reliability, which is a method of accommodating all the crossover wires in one storage section.

[0004]

According to a first aspect of the present invention, there is provided a stator for an electric motor, the stator core being covered with a covering member made of an insulating resin, and the stator core being wound from above the covering member. At least one set of first-phase to third-phase coils and one of the first to third coils provided on one end face in the axial direction of the covering member.
In a stator of an electric motor having a crossover wire accommodating portion for accommodating a crossover wire of a phase coil, the notch provided for introducing the coil crossover wire from the coil to the crossover wire accommodating portion. The side wall height of the portion is different for each phase coil.

According to the above means, since the axial height of the crossover wire of each phase coil is different for each phase, the coil crossover wires of different phases must even be bent in the crossover wire storage portion. It does not intersect in the height direction. Therefore, there is no risk of dielectric breakdown between coils of different phases in the crossover wire storage portion, and it is not necessary to separately insert the crossover wire of each phase coil into each separate storage portion, which reduces the size of the device. Can be realized.

According to a second aspect of the present invention, there is provided a stator of an electric motor, wherein an upper end surface thereof has an axial rib having a height substantially equal to a height of a notch portion corresponding to each phase coil, and a connecting line of each coil is At least one crossover wire of the corresponding coil is placed on the side wall of the crossover wire storage portion on the way to the pair of coils, and the crossover wire of the corresponding coil is placed on the upper end surface.

According to the above means, the crossover wire of each coil is placed and held on the upper end surface of the axial rib while the crossover wire of each coil crosses the coil of the next set. Can be prevented, and the insulation distance between the coils of different phases can be reliably ensured.

In the stator of the electric motor according to claim 3, the uppermost step surface has substantially the same height as the highest one of the cutout portions of the coil, and the next step surface has the second height. A stepwise axial rib having substantially the same height as the notch portion, the crossover wire of each coil is installed on the side wall of the crossover wire storage portion while the crossover wire of each coil is crossing over to the next set of coils, The crossover of the corresponding coil is placed on the step surface. Here, the substantially same height means a height within a range of corresponding cutout portion height ± (2 × height dimension of crossover wire).

According to the above-mentioned means, as in the case of the second aspect, the crossover wire of each coil is placed and held on the step surface of the axial rib while the crossover wire of each coil crosses the coil of the next set. Therefore, it is possible to prevent bending of the crossover wire that occurs during the crossover, and to ensure the insulation distance between the coils of different phases.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below in detail with reference to FIGS. In addition, in the embodiment, an example in which the present invention is applied to a stator of an outer rotor type DC brushless motor is shown, but the present invention is not limited to this, and it goes without saying that it is applicable to an inner rotor type DC brushless motor. .

FIG. 5 is a plan view showing the entire structure of the stator 10 of the present outer rotor type brushless motor. In the case of this example, the rotor has a structure of three phases, 36 slots, and 24 poles, and although not shown, a rotor having 24 poles of permanent magnets arranged on the outer periphery of the stator 10 so as to face the stator 10. Therefore, the outer rotor type brushless motor is configured by being paired with the stator 10.

As shown in FIG. 9, the stator core 20 comprises an annular core yoke portion 20b and a plurality of core tooth portions 20a protruding radially outward from the core yoke portion 20b.
It is formed by stacking punched silicon steel sheets. Further, the stator iron core 20 has a structure in which almost the entire surface of the iron core tooth portion 20a except the outer peripheral surface is covered with an insulating resin covering member 90 formed by insert molding, and the coils 30u, 30v, 30w. Is wound around each core tooth portion 20a from above the covering member 90. As for the coils, in the case of the present embodiment, the U-phase coil 30u, the V-phase coil 30v, and the W-phase coil 30w are 12 coils each.
It is divided into sets and wound, and these are crossed wires 40u, 40v,
40w is connected in series to form the entire three-phase winding.

A partial top view of the stator is shown in FIG.
A sectional view is shown in FIG. As shown in the figure, the coils 30u,
The space on the inner diameter side where the lead wires of the winding start and the winding end of 30v and 30w enter and exit forms the crossover wire storage portion 60 which is a circumferential grooved space surrounded by the crossover wire storage portion side wall 50 on both sides. And crossovers 40u, 40 of each phase
v and 40w reach the next set of coils via the inside of the crossover wire storage portion 60. FIG. 1 and FIG. 2 are perspective views showing a main part before and after winding mounting in order to explain the details of this portion. The side wall height of the notch 70 provided for introducing the coil crossovers 40u, 40v, 40w from the coil into the crossover accommodating portion 60 is different for each phase coil and is different for U, V, W phases. Respectively h1, h2, 0
Has become. Further, in the case of this embodiment, the W-phase is notched so that the side wall height is 0 so that the side wall height is 0. However, as is clear from the gist of the invention, the W phase does not necessarily have to be 0.

The crossovers 40u, 40v, 40w are output from the coil, pass through the cutout portion 70, and are wired substantially horizontally in the crossover storage portion 60, so that the height of the cutout portion side wall is the same. Into the next set of in-phase coils having in this case,
Crossovers 40u, 4 of each phase coil 30u, 30v, 30w
Since the axial heights of 0v and 40w are different for each phase,
Even coil crossover wires of different phases can be wired in the crossover wire storage portion 60 without intersecting in the height direction.

Further, the upper end surface of each phase coil 30u, 3
The axial rib 80a having substantially the same height as the height of the cutout portion 70 corresponding to 0v and 30w is provided by the crossover wire 4 of each coil.
0u, 40v, 40w are installed on the side wall 50 of the crossover wire storage portion 60 on the way to the next set of coils, and the crossover wires 40u, 40v, 40w of the corresponding coils are supported by their upper end surfaces. Since it is wired, the crossovers 40u, 40
The wirings v and 40w are wired in such a manner that the insulation distance between the phases is secured without bending in the middle.

The coil connecting wires 40u, 40v, 40
In the case of the present embodiment, the notch width of the notch portion 70 provided for introducing w into the crossover wire storage portion 60 is almost the entire surface corresponding to the winding width, but of course, the crossover wire 40u,
The effect of the present invention is the same even in a form in which only the portions necessary for introducing 40v and 40w are cut out and the central portion is not cut out. The height of the side wall of the U-, V-, and W-phase cutouts can be increased or decreased to have the same effect. However, considering the automation of wiring and the ease of connection check, etc. It is desirable that the U-phase coil be gradually reduced to the W-phase coil or that they are periodically arranged in the reverse order.

A second embodiment is shown in FIGS. Similar to the first embodiment, a rib 80b for supporting the coil connecting wires 40u, 40v, 40w on the upper end surface thereof is installed on the side wall 50 of the connecting wire housing portion 60. In this case,
The height of the uppermost step surface is such that the cutout portion 70 of the coil is formed.
Is the highest, i.e., a stair-shaped axial rib 80b having a height substantially equal to h1 and a next step surface having a second height, that is, substantially equal to h2. Similar to the first embodiment, while the crossovers 40u, 40v, 40w of each coil cross the coils of the next set, the crossovers 40u, 40v, 40w of the corresponding coils are placed on the corresponding step surfaces. Since the wiring is carried out, as in the first embodiment,
Wiring is performed while the insulation distance between the phases is secured without bending during the process. The axial thickness of the axial ribs 80a and 80b is preferably in the range of 1 to 10 mm.

[0018]

As described above, according to the present invention, it is possible to provide a wiring method for a coil connecting wire of a stator winding having a simple structure and high insulation reliability.

[Brief description of drawings]

FIG. 1 is a perspective view showing a main part of a first embodiment of the present invention.

FIG. 2 is a perspective view showing a main part of the first embodiment of the present invention (before winding mounting).

FIG. 3 is a perspective view showing a main part of a second embodiment of the present invention.

FIG. 4 is a perspective view showing a main part of a second embodiment of the present invention (before winding mounting).

FIG. 5 is a plan view of a stator of an outer rotor type DC brushless motor according to the present invention.

FIG. 6 is a partial top view of a stator.

7 is a sectional view taken along line AA of FIG.

FIG. 8 is a partial top view of a stator before winding mounting.

9 is a sectional view taken along line BB of FIG.

FIG. 10 is a sectional view taken along line CC of FIG.

[Explanation of symbols]

10: Stator 20: Stator core 20a: Iron core tooth part 20b: Iron core yoke 30u, 30v, 30w: coil 40u, 40v, 40w: Crossover 50: Side wall of crossover section 60: Crossover storage 70: Notch for introducing crossover 80a: Axial rib 80b: stair-shaped axial rib 90: Covering member made of insulating resin

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hideaki Nakanishi             2-33 Higashi Kusatsu 2-38, Kusatsu City, Shiga Prefecture             Electric Stock Association In-house F term (reference) 5H603 AA03 AA04 BB01 BB07 BB10                       BB12 BB13 CA01 CA05 CB04                       CB18 CB24 CB26 CC11 CC17                       CD21 CE01 FA16                 5H604 BB01 BB14 BB15 BB17 CC01                       CC05 CC16 DB01 PB04 PC01                       QA01 QB01 QB14

Claims (3)

[Claims] 1. A stator core 20 covered with a covering member 90 made of an insulating resin, and two or more groups of first to third phases wound around the stator core 20 from above the covering member 90. The phase coils 30u, 30v, 30w and the first to third phase coils 3 provided on one end face in the axial direction of the covering member 90.
Crossovers 40u, 40v, 40w of 0u, 30v, 30w
In a stator of an electric motor having a crossover wire storage portion 60 that extends in the circumferential direction, the coils 30u, 30v, 30w are connected to the crossover wire storage portion 60.
Stator of electric motor, wherein side wall height of crossover introducing notch 70 provided for introducing u, 40v, 40w is different for each phase coil. 2. An axial rib 80a whose upper end surface has substantially the same height as the height of the crossover wire introducing notch portion 70 corresponding to each phase coil, is provided with crossover wires 40u, 40v,
At least one 40w is installed on the side wall 50 of the crossover wire storage portion 60 while passing 40w to the next set of coils,
The stator of the electric motor according to claim 1, wherein crossover wires 40u, 40v, 40w of corresponding coils are mounted on the upper end surface. 3. The uppermost step surface has substantially the same height as the highest cutout portion 70 of the coil, and the next step surface has substantially the same height as the second cutout portion 70. At least one staircase-shaped axial rib 80b having a height is installed on the side wall 50 of the crossover wire accommodating portion 60 while the crossover wires 40u, 40v, 40w of the respective coils cross the next set of coils. , Crossover 40u of the corresponding coil,
40v, 40w is mounted on the said step surface, The stator of the electric motor of Claim 1 characterized by the above-mentioned.