JPH104645A - Motor stator - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To improve insulation performance between different phases. An upper cover (2) and a lower cover (3) are mounted on a stator core (1).
Phase coils 4, V-phase coils, and W-phase coils are wound. In the case of this configuration, the recesses 8 and 9 are provided side by side in the lower cover 3, the connecting wire 6 a of the W-phase coil is inserted into the recess 8, and the connecting wire 5 a of the V-phase coil is inserted into the recess 9. I have. Accordingly, the crossovers 5a and 6a are displaced in the height direction and are separated via the partition walls of the recesses 8 and 9, so that the insulation performance between different phases is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator for an electric motor having a stator core and an insulating cover made of resin.

[0002]

For example, a stator of a three-phase DC brushless motor has a structure in which a resin insulating cover is fitted to a stator core, and coils of each phase are wound around the stator core from above the insulating cover. is there. In the case of this configuration, since a concave portion is formed on one end surface of the insulating cover, and a crossover of a coil of a different phase is inserted into the concave portion at a time, there is a possibility that insulation breakdown may occur between different phases.

[0003] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a motor stator capable of improving insulation performance between different phases.

[0004]

According to a first aspect of the present invention, a stator for an electric motor includes a stator core, a resin insulating cover mounted on the stator core, and a plurality of phases wound on the stator core from above the insulating cover. And a plurality of recesses which are arranged in parallel with the insulating cover and into which the crossover wires of the different-phase coils are inserted, and wherein the adjacent bottom surfaces of the plurality of recesses have a step. Have. According to the above means, the crossover wires of the different phase coils are inserted into the plurality of recesses, respectively, and the crossover wires of the different phase coils are displaced in the height direction. In addition, since the crossovers are separated from each other via the walls of the concave portions, the insulation performance is greatly improved as a whole.

According to a second aspect of the present invention, the crossover of the multi-phase coil is located on both the one end side and the other end side of the insulating cover. It is characterized in that a plurality of concave portions into which the lines are inserted are arranged in parallel. According to the above means, the connecting wires of the coils of the plurality of phases are located on both the one end face side and the other end face side of the insulating cover. Therefore, unlike the case where the crossover wires of a plurality of phases are concentrated on one end surface side of the insulating cover, it is not necessary to provide the concave portions on one end surface of the insulating cover, thereby reducing the size of the device.

According to a third aspect of the present invention, the stator of the electric motor is characterized in that each recess is formed in a circumferential shape, and a cutout portion into which a crossover is inserted is formed in a wall of each recess. According to the above means, since the crossover is wound around the concave portion in a circumferential shape, the length of the coil wire is reduced. Therefore, the resistance of the coil wire is reduced, and the electrical characteristics are improved.

According to a fourth aspect of the present invention, the stator of the electric motor is characterized in that the bottom surface of at least one of the plurality of recesses is located at substantially the same height as the winding end of the coil. According to the above means, the bottom surface of the concave portion is substantially at the same height as the winding end portion of the coil. For this reason, when winding the coil around the stator core, the crossover wire can be easily inserted into the concave portion, so that the assemblability and workability are improved.

According to a fifth aspect of the present invention, in the electric motor stator, a plurality of cylindrical terminal insertion portions are integrally formed at portions of the insulating cover corresponding to the angular positions of the winding start end and the winding end of each phase coil. It is characterized in that a groove is formed in each terminal insertion portion, and the groove into which the terminal wire of the coil is inserted is formed. According to the above-described means, if the terminal wires of the coils of a plurality of phases are inserted into the groove portions of the terminal insertion portions, and then the connection terminals are inserted into the terminal insertion portions, the respective terminal wires are held by the connection terminals. For this reason, when winding the coil around the stator core, it is not necessary to separately hold the terminal wire. At the same time, if the connection terminal is inserted into each terminal insertion portion, each terminal line is connected to the connection terminal, so that the processing of the terminal line is generally simplified. In addition, since the terminal insertion portion is arranged corresponding to the winding start end and the winding end, the terminal wire of the coil is easily inserted into the groove. Furthermore, since a plurality of terminal insertion portions are formed integrally with the insulating cover,
The cost of the device is reduced as compared with a case where a plurality of terminal insertion portions are separately attached to the insulating cover.

According to a sixth aspect of the present invention, the stator of the electric motor is characterized in that the height of the walls of the plurality of recesses changes stepwise. According to the above means, when winding the coil around the stator core, the crossover can be hooked on the wall of the concave portion and easily inserted into the concave portion, so that the lead time can be shortened.

According to a seventh aspect of the present invention, the stator of the electric motor is characterized in that the distance between the bottom surface of the plurality of recesses and the stator core is gradually reduced from the inner peripheral side to the outer peripheral side. According to the above means, the crossover wire of the heterophase coil has a step in the height direction as it is routed along the bottom surface of the concave portion. For this reason, the crossover wires of the different-phase coils are prevented from coming into contact at the intersections, and the insulation performance between the different phases is further improved.

According to an eighth aspect of the present invention, the stator of the electric motor is characterized in that a groove portion into which a coil wire is inserted is formed at a winding start end of a winding portion of the insulating cover on which the coil is wound. . According to the above means, the coil wire is positioned as it is inserted into the groove of the insulating cover. For this reason, the beginning of winding of each coil wire is stabilized, and the coil wires are easily aligned and wound along the portion, so that the electrical characteristics are stabilized and the assembling workability and workability are improved.

[0012]

FIG. 1 shows a first embodiment of the present invention.
This will be described with reference to FIG. In this embodiment, the present invention is applied to a stator of a three-phase outer rotor type DC brushless motor for rotating a pulsator and a washing tub of a washing machine. First, in FIG. 9, the stator core 1 is formed by connecting a plurality of arc-shaped unit cores (not shown), and each unit core is formed by laminating steel plates.

The upper cover 2 corresponding to an insulating cover is formed of a non-conductive synthetic resin. As shown in FIG. 1, a plurality of cylindrical wall ribs 2a and a plurality of radially extending ribs are formed from the wall ribs 2a. (See FIG. 5). Each of the winding portions 2b has a U-shaped cross section. When the upper cover 2 is pushed into the stator core 1 from above in the axial direction, the winding portions 2b become the teeth 1a to 1c of the stator core 1 as shown in FIG. And the upper half of the stator core 1 is covered with the upper cover 2 except for the inner and outer peripheral surfaces.

The lower cover 3 shown in FIG. 1 corresponding to an insulating cover is made of a non-conductive synthetic resin. Like the upper cover 2, a cylindrical wall rib 3a and a plurality of radially extending ribs from the wall rib 3a are provided. Winding part 3b. And
Each of the winding portions 3b has a U-shaped cross section. When the lower cover 3 is pushed into the stator core 1 from below in the axial direction, the lower cover 3
The ribs 3a and the winding portions 3b of the upper cover 2 abut against the wall ribs 2a and the winding portions 2b of the upper cover 2, and the winding portions 3b cover the teeth 1a to 1c of the stator core 1. Thereby, as shown in FIG. 10, the lower half of the stator core 1 is covered with the lower cover 3 except for the inner and outer peripheral surfaces.

Each tooth 1a of the stator core 1 has
As shown in FIG.
The phase coil 4 is wound. These U-phase coils 4
After winding the coil wire around the tooth 1a with 4s as the winding start end, sequentially winding the coil wire around the tooth 1a located on the arrow A side of the tooth 1a. (Reference numeral 4e)
Indicates the winding end portion of the U-phase coil 4). Then, for each tooth 1a, as shown in FIG.
The coil wire is wound in the direction of arrow B, and the crossover wire 4a of each U-phase coil 4 is located on the upper cover 2 side.

Each of the teeth 1b of the stator core 1 has a structure shown in FIG.
As shown in FIG.
The phase coil 5 is wound. These V-phase coils 5
After winding the coil wire around the tooth 1b with 5s as the winding start end, the coil wire is sequentially wound around the tooth 1b located in the direction opposite to the arrow A of the tooth 1b. It is formed by turning (reference numeral 5e indicates a winding end portion of the V-phase coil 5). As shown in FIG. 10, a coil wire is wound around each tooth 1b in the direction opposite to the arrow B, and the crossover wire 5a of each V-phase coil 5 is located on the lower cover 3 side. doing.

Each of the teeth 1c of the stator core 1 has a structure shown in FIG.
As shown in FIG.
The phase coil 6 is wound. These W-phase coils 6
After winding the coil wire around the tooth 1c with 6s as the winding start end, the coil wire is sequentially wound around the tooth 1c located in the direction opposite to the arrow A of the tooth 1c. It is formed by turning (the reference numeral 6e indicates the winding end portion of the W-phase coil 6). As shown in FIG. 10, a coil wire is wound around each tooth 1c in the direction opposite to the arrow B, and the crossover wire 6a of each W-phase coil 6 is located on the lower cover 3 side. doing.

As shown in FIG. 1, the upper cover 2 is formed with a concave portion 7 having a circular shape. This recess 7 is shown in FIG.
As shown in FIG. 2, the upper cover 2 is composed of a wall rib 2a, an annular bottom plate 7a formed integrally with the wall rib 2a, and a cylindrical wall rib 7b formed integrally with the bottom plate 7a. The upper surface of the bottom plate portion 7a is located at substantially the same height as the winding end portion of the U-phase coil 4, and the upper end surface of the wall rib 7b is located below the upper end surface of the wall rib 2a.

The wall rib 2a is formed with a plurality of cutouts 7c opening upward. These notches 7c are arranged corresponding to the teeth 1a as shown in FIG. 9, and the crossover wires 4a of the U-phase coils 4 are notched 7c.
And is drawn out through the adjacent cutout 7c while being supported by the bottom plate 7a.

As shown in FIG. 2, the lower cover 3 is formed with a first concave portion 8 having a circumferential shape. This recess 8
Is composed of a wall rib 3a of the lower cover 3, an annular bottom plate 8a formed integrally with the wall rib 3a, and a cylindrical wall rib 8b formed integrally with the bottom plate 8a. The lower surface of 8a is located at substantially the same height as the winding end of the W-phase coil 6, and the lower end surface of the wall rib 8b is located above the lower end surface of the wall rib 3a.

The wall rib 3a is formed with a plurality of notches 8c opening downward. These notches 8c are arranged corresponding to the teeth 1c, as shown in FIG. 10, and the crossover wires 6a of each W-phase coil 6 are notched.
c and is inserted into the recess 8 through the notch 8c adjacent thereto while being supported by the bottom plate 8a.

As shown in FIG. 4, the lower cover 3 has a first
Second concave portion 9 located on the inner peripheral side of concave portion 8
Are juxtaposed. The recess 9 is provided with a wall rib 8 b of the recess 8.
And an annular bottom plate portion 9a integrally formed with the wall rib 8a and a cylindrical wall rib 9b formed integrally with the bottom plate portion 9a. The bottom plate portion 9a
a, and the lower end surface of the wall rib 9b is
b is located above the lower end surface.

The wall ribs 3a and 8b are formed with a plurality of cutouts 9c and 9d opening downward. These notches 9c and 9d are arranged corresponding to the teeth 1b, as shown in FIG. 10, and the height of the bottom surface of each notch 9c is, as shown in FIG. It is set substantially equal to the bottom surface, and the bottom surface of each of the cutouts 9c and 9d is located below the bottom plate portion 8a. As shown in FIG. 10, the crossover wire 5a of each V-phase coil 5 is inserted into the recess 9 through the notches 9c and 9d, and the bottom plate 9
While being supported by a, it is drawn out through adjacent notches 9d and 9c.

As shown in FIG. 5, a horizontal seating surface 2c is formed on the upper cover 2, and three terminal insertion portions 10 to 12 each having a rectangular cylindrical shape are integrally formed on the seating surface 2c. Have been. The terminal insertion portions 10 to 12 are arranged close to the winding portion 2 b so as to correspond to the angular positions of the winding start ends 4 s to 6 s of the coils 4 to 6.
Grooves 10a to 12a that open upward are formed in the inner and outer peripheral side walls of the first to second walls. The width of each of the grooves 10a to 12a is set substantially equal to the diameter of the coil wire, and the terminal wires 4s to 6s on the winding start side of the coils 4 to 6 are, as shown in FIGS. Grooves 10a-
12a.

As shown in FIG. 5, three terminal insertion portions 13 to 15 each having a rectangular cylindrical shape are integrally formed on the seating surface 2c of the upper cover 2. These terminal insertion portions 13 to 15 are arranged corresponding to the angular positions of the winding end portions 4 e to 6 e of the coils 4 to 6, and the inner and outer peripheral walls of the terminal insertion portions 13 to 15. The grooves 13a to 13
15a are formed. These grooves 13a to 15a
Are set substantially equal to the diameter of the coil wire, and the terminal wires 4e to 6e on the winding end side of the coils 4 to 6 are:
As shown in FIGS. 6 to 8, they are inserted into the grooves 13a to 15a.

External connection terminals (not shown) are inserted into the terminal insertion portions 10 to 12, and common connection terminals (not shown) are inserted into the terminal insertion portions 13 to 15. Each of these connection terminals is composed of a poke-in terminal or the like. When an external connection terminal (not shown) is inserted into the terminal insertion portions 10 to 12 and a common connection terminal is inserted into the terminal insertion portions 13 to 15, Each connection terminal breaks through the coating of the coil wire and is electrically connected to the core wire of the coil wire.

Next, the procedure for assembling the stator will be described. First, the upper cover 2 is attached to the stator core 1 from both sides in the axial direction.
And the lower cover 3 is attached. Then, as shown in FIG. 8, the coil wire is pushed into the grooves 12a, 12a of the terminal insertion portion 12, and the external connection terminal is inserted into the terminal insertion portion 12, thereby holding the coil wire by the external connection terminal. Thereafter, the U-phase coil 4 is wound around the first tooth 1a with 4s as the winding start end.

When the U-phase coil 4 is wound around the first teeth 1a, the automatic winding machine is moved in FIG. 9 so that the crossover wire 4a of the U-phase coil 4 is hooked on the wall rib 2a. After that, the U-phase coil 4 is wound around the next tooth 1a. And, by repeating this operation,
When the U-phase coil 4 is sequentially wound around a plurality of teeth 1a,
In FIG. 8, the terminal wire of the U-phase coil 4 is inserted into the grooves 13a, 13a of the terminal insertion portion 13, and the common connection terminal is inserted into the terminal insertion portion 13.

When the winding of the U-phase coil 4 is completed, the coil wire is pushed into the grooves 10a, 10a of the terminal insertion portion 10 and the external connection terminals are inserted into the terminal insertion portion 10 in FIG. After the coil wire is held by the external connection terminal, the first tooth 1c is set with the reference numeral 6s as the winding start end.
Around the W-phase coil 6.

Next, in FIG. 10, the automatic winding machine is moved, and while the crossover wire 6a of the W-phase coil 6 is inserted into the recess 8 so as to be hooked on the wall rib 3a, the plurality of teeth 1c are The phase coils 6 are sequentially wound. Then, in FIG. 6, after the terminal wire of the W-phase coil 6 is inserted into the groove portions 14 a of the terminal insertion portion 14, the common connection terminal is inserted into the terminal insertion portion 15.

When the winding of the W-phase coil 6 is completed, the coil wire is pushed into the grooves 11a, 11a of the terminal insertion portion 11 and the external connection terminal is inserted into the terminal insertion portion 11 in FIG. After the coil wire is held by the external connection terminal, the first tooth 1b is set with the reference numeral 5s as the winding start end.
Is wound around the V-phase coil 5.

Next, referring to FIG. 10, the automatic winding machine is moved to insert the crossover wire 5a of the V-phase coil 5 into the concave portion 9 so as to be hooked on the wall rib 8b. The phase coils 5 are sequentially wound. Then, in FIG. 7, after the terminal wire of the V-phase coil 5 is inserted into the groove portions 15 a of the terminal insertion portion 15, the common connection terminal is inserted into the terminal insertion portion 15.

According to the above embodiment, the lower cover 3 has the recess 8
And 9 are juxtaposed, and the connecting wires 5a and W of the V-phase coil 5
The crossover wire 6a of the phase coil 6 was inserted into the recesses 9 and 8. For this reason, the crossovers 5a and 6a are displaced in the height direction and are separated via the wall ribs 8b, so that the insulation performance between different phases is generally improved, and as a result, insulation breakdown is prevented.

By the way, the connecting wires 4a to 6a are
And concentrated on either side of the lower cover 3
It is necessary to arrange three concave portions in one of the upper cover 2 and the lower cover 3. For this reason, not only one of the upper cover 2 and the lower cover 3 is enlarged, but also the other is enlarged. On the other hand, in the above embodiment, the connecting wire 4a of the U-phase coil 4 is drawn out to the upper cover 2 side, and the connecting wire 5a of the V-phase coil 5 and the connecting wire 6a of the W-phase coil 6 are drawn out to the lower cover 3 side. . For this reason, it is not necessary to arrange the three concave portions side by side, and the device is downsized.

The recesses 7 to 9 are provided circumferentially, and a notch 7c is formed in the wall rib 2a of the recess 7 so that the recess 8
A notch 8c is formed in the wall rib 3a of the
A notch 9d was formed in b. For this reason, since each coil wire is routed circumferentially along the concave portions 7 to 9, the length dimension of each coil wire is reduced. Therefore, the resistance of the coil wire is reduced, and the electrical characteristics are improved.

The bottom plate 7a of the recess 7 and the bottom plate 8a of the recess 8 are arranged at substantially the same height as the winding end of the U-phase coil 4 and the winding end of the W-phase coil 6. For this reason,
The crossover wire 4a of each U-phase coil 4 and the crossover wire 6a of each W-phase coil 6 can be easily inserted into the recesses 7 and 8, so that the assemblability and workability are improved, and as a result, lead time is shortened and mass production is achieved. Improvement of quality, reduction of cost, etc. are achieved.

The terminal insertion portions 10 to 15 are connected to the upper cover 2.
Provided. For this reason, the groove 10 of the terminal insertion portions 10 to 15
After inserting the terminal wire of the U-phase coil 4 through the terminal wire of the W-phase coil 6 into the terminals a through 15a, the connection terminals are inserted into the terminal insertion portions 10 through 15, whereby the connection and holding of each terminal line are performed. . Therefore, the processing of the terminal wire is facilitated, so that the assemblability and workability are improved.

Further, the terminal insertion portions 10 to 15 are connected to the coil 4
No. to No. 6 are arranged corresponding to the winding start end and the winding end. For this reason, the terminal wires of the coils 4 to 6 are connected to the groove portions 10 a to 1.
Since it can be easily inserted into the terminal 5a, the processing of the terminal line is further facilitated. Further, since the terminal insertion portions 10 to 15 are formed integrally with the upper cover 2, the terminal insertion portions 10 to 15 are
The cost of the apparatus is reduced as compared with a case where the apparatus is separately mounted.

The height of the wall rib 3a of the recess 8 and the height of the wall rib 8b of the recess 9 are changed stepwise. For this reason, when winding the V-phase coil 5 and the W-phase coil 6, the crossover wires 5a and 6a
Can be hooked on the wall ribs 8b and 3a and inserted into the recesses 9 and 8. Therefore, the crossovers 5a and 6a
Can be easily inserted into the recesses 9 and 8, so that the lead time can be further shortened, the mass production quality can be further improved, and the cost can be further reduced.

The height of the bottom surface of the recess 9 (the distance from the stator core 1) is higher than the bottom surface of the recess 8. For this reason, as shown in FIG.
Since the connecting wires 6a of the a and W-phase coils 6 are routed along the bottom surface of the concave portion 9 and the bottom surface of the concave portion 8 and have a step in the height direction, the connecting wires 5a and 6a are prevented from contacting at the intersection. Is done. Therefore, insulation performance between different phases is further improved, and as a result, insulation breakdown is reliably prevented.

Further, the height of the bottom surface of the notch 9c on the outer peripheral side is made higher than the bottom surface of the concave portion 8. Therefore, the V-phase coil 5
Crossover line 5a is positioned by the bottom surface of the notch 9c,
Since the connecting wire 5a is reliably prevented from contacting the connecting wire 6a, insulation breakdown between different phases is more reliably prevented.

Next, a second embodiment of the present invention will be described with reference to FIGS. The same members as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. Hereinafter, only different members will be described. First, FIG.
In the bottom plate 7a of the upper cover 2, a plurality of grooves 7d
(Only one is shown), and as shown in FIG. 12, the crossover wire 4a of each U-phase coil 4 is inserted into the groove 7d.

The wall rib 2a of the upper cover 2 and the lower cover 3
As shown in FIG. 13, a plurality of groove portions 7e extending in the vertical direction are formed on the outer peripheral surface of the wall rib 3a (only one is shown). As shown in FIG. 12, each of the grooves 7e is located at the base end of the tooth 1a, and the connecting wire 4a of each U-phase coil 4 is drawn out from the notch 7c of the concave portion 7 and then the groove 7e. Is inserted into the next table 1a
Wound around.

As shown in FIG. 14, a plurality of grooves 8d (only one is shown) are formed in the bottom plate 8a of the recess 8, and a plurality of grooves 9e are formed in the bottom plate 9a of the recess 9. In the cage (only one is shown), the connecting wire 5a of each V-phase coil 5 and the connecting wire 6a of each W-phase coil 6 are inserted into the grooves 9e and 8d.

The wall rib 3a of the lower cover 3 and the upper cover 2
The wall rib 2a is formed with a plurality of grooves 8e located on the outer peripheral surface and extending in the vertical direction (only one is shown). These grooves 8e are located at the base ends of the teeth 1c, and the crossover wires 6a of the respective W-phase coils 6 are inserted into the grooves 8e after being pulled out from the cutouts 8c of the concave portions 8, and are inserted into the teeth 1c. It is wound. Also, the wall rib 3a of the lower cover 3
The wall rib 2a of the upper cover 2 is formed with a plurality of grooves 9f extending in the vertical direction and located on the outer peripheral surface.
Only). These grooves 9f are located at the base ends of the teeth 1b, and the connecting wires 5a of the V-phase coils 5 are provided.
Is pulled out from the notches 9d and 9c of the recess 9,
It is inserted into the groove 9f and wound around the tooth 1b.

The depth of each groove 7d, 8d, 9e is set to approximately 1/5 to 3/2 of the diameter of the coil wire. Further, the depth dimension of each of the grooves 7e, 8e, 9f is set to approximately 1/2 of the diameter of the coil wire.

According to the above embodiment, the bottom plate 7 of the recess 7
a, a groove 7 in the bottom plate 8a of the recess 8 and a bottom plate 9a of the recess 9;
d, 8d, 9e were formed, and the connecting wires 4a, 6a, 5a were inserted into the grooves 7d, 8d, 9e. Therefore, crossover 4
a, 5a, and 6a are guided by the grooves 7d, 8d, and 9e, and the lengths of the crossovers 4a to 6a become the minimum values.
The resistance of the coil wire is reduced, and as a result, the electrical characteristics are further improved. Moreover, since the lengths of the crossover wires 4a to 6a are made uniform, the resistance of the coil wire is made constant, and the electrical characteristics are improved in this respect as well. Furthermore, each coil 4-6
There is also an advantage that the slack is prevented.

Further, grooves 7e, 8e, 9f are formed in the upper cover 2 and the lower cover 3, and the first turn of the U-phase coil 4, the W-phase coil 6, and the V-phase coil 5 is formed in the grooves 7e, 9f, 8e.
Inserted in. Therefore, the U-phase coil 4 to the W-phase coil 6
The winding start position is stable, and the coil wires can be easily aligned and wound, so that the lead time can be further shortened, the mass production quality can be further improved, the cost can be further reduced, and so on. Sag is prevented.

Next, a third embodiment of the present invention will be described with reference to FIGS. The same members as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. Hereinafter, only different members will be described. First, FIG.
, Each winding part 2b of the upper cover 2 and the lower cover 3
Each of the winding portions 3b has grooves 2c and 3c located at upper and lower end surfaces. These grooves 2c and 3c
As shown in FIG. 17, is located at the base end of the winding portions 2b and 3b, and the depth dimension of the grooves 2c and 3c is set to approximately 1/2 of the diameter of the coil wire.

According to the above embodiment, one of the coils 4 to 6
The turns are inserted into the groove portions 2c and 3c, and the upper coil wire is wound so as to be dropped between the lower coil wires (so-called close contact winding). For this reason, the first turn of each of the coils 4 to 6 is stabilized, so that it is easy to perform aligned winding. Therefore, the electrical characteristics are stabilized, and the quality is improved. At the same time, assembling workability and workability are improved, so that lead time is shortened, cost is reduced, and the like.

In the third embodiment, one groove 2c and 3c is formed at the winding start end of each of the winding portions 2b and 3b. However, the present invention is not limited to this. And a groove 2c in the entire area of each of the winding portions 2b and 3b.
And 3c may be formed. In the first to third embodiments, the winding is performed in the order of the U-phase coil 4, the W-phase coil 6, and the V-phase coil 5. However, the winding is not limited to this. The coil is wound in the order of the coil 6, the V-phase coil 5, and the U-phase coil 4;
May be wound before the V-phase coil 5.

In the first to third embodiments,
Although the height dimension of the wall ribs 9b, 8b, 3a of the lower cover 3 is increased from the inner peripheral side to the outer peripheral side, it is not limited to this, and may be reduced from the inner peripheral side to the outer peripheral side. Is also good.

In the first to third embodiments,
Although the height of the wall ribs 7b, 2a of the upper cover 2 is increased from the inner circumference to the outer circumference, the height is not limited to this, and may be reduced from the inner circumference to the outer circumference. .

In the first to third embodiments,
Although the present invention has been applied to the stator of the outer rotor type DC brushless motor, the invention is not limited to this. For example, the present invention may be applied to the stator of an inner rotor type DC brushless motor.

[0055]

As is apparent from the above description, the stator of the electric motor according to the present invention has the following effects. According to the first aspect of the present invention, a plurality of concave portions are provided in the insulating cover, and the crossover wires of the different-phase coils are inserted into the respective concave portions. For this reason,
Since the crossover wires of the different-phase coils are displaced in the height direction and are separated through the walls of the concave portions, the insulation performance between the different phases is generally improved, and as a result, insulation breakdown is prevented. According to the second aspect of the present invention, the crossover wires of the multi-phase coil are drawn out on both the one end face side and the other end face side of the insulating cover. For this reason, it is not necessary to provide a large number of concave portions on one end surface of the insulating cover, and the device is downsized.

According to the third aspect of the present invention, each recess is provided circumferentially, and a notch for coil wire insertion is formed in the wall of each recess. For this reason, each coil wire is routed circumferentially along the concave portion, and the length of each coil wire is shortened, so that the resistance of the coil wire is reduced, and as a result, the electrical characteristics are improved. According to the fourth aspect of the present invention, the bottom surface of the concave portion is disposed at substantially the same height as the winding end portion of the coil. For this reason, it becomes easy to insert the crossover into the concave portion, so that the assemblability and workability are improved.

According to the fifth aspect, the terminal insertion portion is formed integrally with the insulating cover. For this reason, if the connection terminal is inserted into the terminal insertion portion after the terminal wire of the coil is inserted into the groove portion of the terminal insertion portion, the connection and holding of each terminal wire are performed, so that the processing of the terminal wire becomes easy. According to the means of claim 6, the height of the walls of the plurality of recesses is changed stepwise. For this reason, when winding the coil, the crossover can be hooked on the wall and easily inserted into the recess, so that the assemblability and workability are improved.

According to the seventh aspect of the present invention, the bottom surface of the concave portion is raised stepwise from the outer peripheral side toward the inner peripheral side. For this reason, since the crossovers of the different phase coils have a step in the height direction, the crossovers are prevented from contacting at the intersection. Therefore, insulation performance between different phases is further improved, and as a result, insulation breakdown is reliably prevented. According to the eighth aspect of the present invention, the groove into which the coil wire is inserted is formed in the winding portion of the insulating cover. For this reason, the beginning of winding of each coil is stabilized, and it is easy to perform aligned winding, so that electrical characteristics are stabilized and assembling workability and workability are improved.

[Brief description of the drawings]

FIG. 1 is a view showing a first embodiment of the present invention (a longitudinal sectional view showing a main part).

FIG. 2 is a longitudinal sectional view showing a main part of a lower cover.

FIG. 3 is a longitudinal sectional view showing a main part of an upper cover.

FIG. 4 is another longitudinal sectional view showing a main part of the lower cover.

FIG. 5 is a partial top view showing the upper cover.

FIG. 6 is a top view showing a winding state of a W-phase coil.

FIG. 7 is a top view showing a winding state of a V-phase coil.

FIG. 8 is a top view showing a winding state of a U-phase coil.

FIG. 9 is a perspective view showing the overall configuration from above.

FIG. 10 is a perspective view showing the entire configuration from below.

FIG. 11 is a perspective view showing a crossing portion of a crossover of a different-phase coil.

FIG. 12 is a view showing a second embodiment of the present invention (a perspective view showing a main part of an upper cover).

FIG. 13 is a top view showing a main part of the upper cover.

FIG. 14 is a bottom view showing the main part of the lower cover.

FIG. 15 is a longitudinal sectional view showing a main part of an upper cover.

FIG. 16 is a view showing a third embodiment of the present invention (a longitudinal sectional view showing a main part).

FIG. 17 is a perspective view showing a main part of an upper cover.

[Explanation of symbols]

1 is a stator core, 2 is an upper cover (insulating cover), 2b
And 3b are winding parts, 3 is a lower cover (insulating cover), 4
Is a U-phase coil (coil), 4a is a crossover, 5 is a V-phase coil (coil), 5a is a crossover, 6 is a W-phase coil (coil), 6a is a crossover, 7 to 9 are recesses, 7c and 8c. Denotes a notch, 9c to 9d denote notches, 10 to 15 denote terminal insertion portions, and 10a to 15a denote grooves.

Claims (8)

[Claims] A stator core; a resin insulating cover mounted on the stator core; a plurality of phase coils wound on the stator core from above the insulating cover; And a plurality of recesses into which the connecting wires are inserted, respectively, wherein the plurality of recesses have a step between adjacent bottom surfaces. 2. The multi-phase coil has crossover wires located on both the one end face side and the other end face side of the insulating cover, and the crossover wires of the different phase coils are inserted into at least one end face of the insulating cover. The stator of an electric motor according to claim 1, wherein a plurality of recesses are arranged in parallel. 3. The stator for an electric motor according to claim 1, wherein each recess has a circumferential shape, and a wall of each recess is formed with a cutout into which a crossover is inserted. 4. The stator according to claim 1, wherein a bottom surface of at least one of the plurality of recesses is located at substantially the same height as a winding end portion of the coil. 5. A plurality of terminal insertion portions each having a cylindrical shape corresponding to the angular positions of a winding start end portion and a winding end portion of each phase coil are integrally formed on the insulating cover. 2. A stator for an electric motor according to claim 1, wherein a groove is formed in the groove for inserting a terminal wire of the coil. 6. The stator according to claim 1, wherein the height of the wall of the plurality of recesses changes stepwise. 7. The stator for an electric motor according to claim 1, wherein the plurality of recesses have a distance from a bottom surface of the stator core to the stator core that decreases gradually from an inner peripheral side to an outer peripheral side. 8. The winding portion of the insulating cover, on which the coil is wound, has a groove positioned at the winding start end and into which the coil wire is inserted. Motor stator.