KR100724537B1 - Mold motor - Google Patents

Abstract

In the mold motor 50 in which the motor frame 53 was formed by mold-molding the stator 10 which consists of the straight cores 16 with mold resin, the straight cores 16 of the strip | belt-shaped back yoke 2 are formed. V-shaped notches formed on the side where the teeth 3 protrude between the plurality of teeth 3 protruding from one side of the long side and the adjacent teeth 3 and 3 of the back yoke 2 ( The laminated board 1 with 4) is laminated | stacked, At least the part except the inner peripheral side of the toothed part 3 is pre-molded by insulating resin, and the insulating layer 12 is made into the straight core 16 The coil 8 is wound around each tooth portion 3 on which the insulating layer 12 is formed, and the stator 10 is formed of the notch portion 4 of the straight core 16. It is bent and formed into a ring shape, and the joining surfaces of both ends of the back yoke 2 are joined by welding or adhesion.

Description

Mold Motor {MOLD MOTOR}

1 is a cross-sectional view of a motor according to a first embodiment of the present invention.

2 is a plan view of a trimmed plate.

3 is a front view illustrating a method of winding a stator core.

4 is a perspective view seen from the inner circumferential side of the straight core.

5 is a perspective view seen from the outer circumferential side of the straight core.

6 is a front view illustrating a step of bending a straight core.

Fig. 7 is a front view of the stator that is bent into a straight core to form a ring.

8 is a plan view of a wiring board mounted on a stator.

9 is an enlarged front view of the vicinity of the joint surface of the back yoke according to the second embodiment.

It is an enlarged front view of the junction surface vicinity of a back yoke when a gap has arisen.

The present invention relates to a mold motor.

The stator of the mold motor is manufactured by a general ring-shaped stator core and a method of producing a straight stator core (this is usually called a "straight core") by bending it into a ring shape. The prior art concerning such a straight core is disclosed by Unexamined-Japanese-Patent No. 1997-308143.

However, it is difficult to actually manufacture a mold motor using the straight core, and the production thereof is difficult only by the technique disclosed in the above publication.

Accordingly, the present invention seeks to provide an invention that can reliably manufacture a mold motor using a straight core.

The invention according to claim 1 is a mold motor in which a motor frame is formed by molding a stator composed of a straight core with a mold resin, wherein the straight core is formed from one side of the long side of the belt-shaped back yoke. A laminated plate having a plurality of protruding teeth and a V-shaped notch formed on the teeth protruding side between the adjacent teeth of the back yoke is configured by lamination, and the straight core is formed at least on the inner circumference of the teeth. A portion except the side is pre-molded with an insulating resin to form an insulating layer, and the straight core is wound around a coil in each tooth portion where the insulating layer is formed, and the stator is bent at the notched portion of the straight core. It is formed in an arc shape or a ring shape, and welds the joint surfaces of both ends of the back yoke. Or it is a mold motor characterized by bonding by bonding.

The invention according to claim 2 is a mold motor according to claim 1, wherein the joining surface shape of the back yoke is formed into a crank shape.

The invention according to claim 3 is characterized in that the motor frame is formed by mold-molding the entire outer edge of the stator, except for the inner diameter of the stator, with a mold resin around the center of the stator. It is a mold motor of Claim 1.

The invention according to claim 4 is the mold motor according to claim 1, wherein the mold resin is an insulating resin or a premix.

The invention according to claim 5 is a mold motor according to claim 1, wherein a wiring board is embedded in the motor frame.

According to the sixth aspect of the present invention, a wiring board is embedded in the motor frame, and a plurality of supporting parts for mounting the wiring board together with the insulating layer are pre-molded on one side of the straight core. It is a mold motor of Claim 1 characterized by the above-mentioned.

The invention according to claim 7, wherein the positioning protrusions further protrude from the plurality of supporting portions, and the wiring board is sandwiched and positioned between the plurality of positioning protrusions. The mold motor described.

The invention according to claim 8 is characterized in that a coating part is pre-molded together with the insulating layer on one side of the straight core, and a plurality of connecting pins for wiring the coil are protruded from the coating part. It is a mold motor of Claim 1.                     

The invention according to claim 9 is characterized in that the connecting pin is provided on the outer circumferential portion of the first to third teeth when the connecting pin is counted from the tooth at the end of the straight core. The mold motor described in.

The invention according to claim 10 is a back yoke which is located on the outer circumference of any one of the first to third teeth when one of the connecting pins for neutral point is counted from a tooth at one end of the straight core. And each phase connecting pin of the connecting pin is formed on a back yoke located at the outer circumference of any one of the first to third teeth or the plurality of teeth when counted from the teeth at the other end of the straight core. It is provided, The mold motor of Claim 6 characterized by the above-mentioned.

The invention according to claim 11 is the mold motor according to claim 1, wherein the mold motor is a brushless DC motor.

The invention according to claim 12 is the mold motor according to claim 1, wherein the number of teeth is 12.

The invention according to claim 13 is the first, fourth, and seventh when the brushless DC motor is three-phase, the number of teeth is 12, and is counted from the teeth on the end side of the straight core. , U-phase coil is wound on 10th tooth, V-phase coil is wound on 2nd, 5th, 8th, and 11th tooth, and 3rd, 6th, 9th W-phase coil is wound around the 12th tooth portion, the mold motor according to claim 1 characterized in that.

The invention according to claim 14 is the mold motor according to claim 1, wherein the mold motor is used for an air conditioner, a pump, a washing machine or an air cleaner.

According to the invention of claim 1, a mold motor using a straight core can be reliably manufactured.

According to the invention of claim 2, it is possible to reduce coil failure due to welding, and the flow of magnetic flux on the joining surface becomes good. In addition, when welding the joint surface portion from the outer peripheral side of the back yoke using a laser or the like, even if a gap occurs in the joint surface, the laser is irradiated to the curved surface of the crank shape, so that the coil in the inner peripheral portion of the back yoke may be damaged. There is no concern. In addition, it is possible to prevent the coil from being damaged during welding, and to suppress resonance of the joint surface portion of the back yoke due to electromagnetic vibration generated in the radial direction, and to secure a magnetic path. Become.

According to the invention of claim 3, since the mold resin also serves as the motor frame, the motor frame becomes unnecessary, and one bracket is unnecessary. As one bracket becomes unnecessary, the distance between the coil and the bracket is shortened and the motor can be made thinner.

In addition, since the resin is molded on the basis of the inner diameter, the inner diameter of the stator core and the shaft center of the housing and the flange rabbet coincide, thereby improving the motor characteristics.

In addition, since the motor frame is made of a resin, even when used in a humid environment, the coil is covered with an insulating resin, so that there is no risk of deterioration of the function and the life of the motor is long.

In addition, since the stator is covered with resin and serves as a bracket, the motor can be made thinner.

In addition, since the coil is coated with a resin, even if the motor vibrates, the coils do not have to be in contact with each other. The coil is very strong and resistant to vibration.

In addition, since the coil is covered with an insulating resin and one side bracket is unnecessary, the distance between the coil and the bracket is shortened and the motor can be made thinner.

According to the invention of claim 5, the motor is compact since the control substrate is incorporated.

According to the inventions of claims 12 and 13, the above-described configuration makes it possible to produce a motor having a good performance as well as relatively good workability such as coil work.

According to the invention of claim 14, even if stored in a humid place, it is possible to use for a long time without rusting.

(Example 1)

The structure and manufacturing process of the three-phase brushless DC motor 50 (hereinafter, simply referred to as a "motor") according to the first embodiment of the present invention will be described with reference to FIGS.

(1) Configuration of the Motor 50

The structure of the motor 50 which concerns on a present Example is demonstrated referring FIG. 1 is a cross-sectional view of the motor 50.

The motor 50 is composed of a motor frame 53, a rotor 56, a bracket 54, and two bearings 55. The motor frame 53 made of the insulating mold resin 52 contains the stator 10 and the wiring board 51. The rotor 56 is composed of a rotating shaft 57, the permanent magnet 60 and the yoke (58). The rotor 56 is rotatably held on the flange rabbit portion 59 and the bracket 54 of the motor frame 53 via the bearing 55. In addition, this bracket 54 is press-fit into the flange rabbit part 59 of the motor frame 53.

According to the motor 50 comprised as mentioned above, since the wiring board 51 provided with the stator core 7, the coil 8, and the control circuit is covered with the insulating mold resin 52, the coil 8 or the stator core (7) It is suitable for a motor used in a humid environment as there is no risk of water ingress. In addition, insulating resin or a premix is used as the mold resin 52.

In addition, since the coil 8 and the wiring board 51 are covered with the mold resin 52, the motor is resistant to vibration.

In addition, since the coil 8 is covered with the mold resin 52, the distance between the live part and the bracket 54 made of steel sheet can be shortened. Since one bracket can be omitted, a thin motor in the rotation axis direction can be made.

Moreover, since the wiring board 51 is incorporated, it becomes a compact motor.

As described above, the motor 50 is suitable as a driving source for rotation of fans and impellers such as air conditioners such as air conditioners, pumps, washing machines, and air purifiers.                     

(2) Manufacturing Method of Motor 50

The manufacturing process of the motor 50 is demonstrated, referring FIGS. 2-4 as follows.

(2-1) Manufacturing Step of Stator Core 7

As shown in FIG. 2, the stator core 7 is formed by laminating | stacking the laminated board 1 formed by punching the thin strip | belt-shaped steel plate 5 (henceforth "hoop material").

In this case, as shown in FIG. 2, the laminated board 1 can form several sheets (for example, eight sheets) in parallel in the width direction of the strip | belt-shaped hoop material 5. As shown in FIG.

The laminated board 1 is formed of the back yoke 2 formed in strip shape, and the twelve teeth 3 extended | extended from the one long side part 2a side of this back yoke 2 perpendicularly.

The teeth 3 are formed on the long side portion 2a side of the white yoke 2 in which the teeth 3 are extended, and a V-shaped notch 4 is formed at the center portion located between the teeth 3.

The teeth 3 are formed in a 'T' shape, and are composed of a teeth main body 3a on which the coil 8 is wound, and a converging portion 3b formed in an angular shape for converging magnetism. .

Below, the punching process is demonstrated.

In the first step, the wound belt-shaped hoop material 5 is drawn.

In a 2nd process, the caulking part 21 is formed in the said hoop material 5 at predetermined intervals.

In the 3rd process, the hoop material 5 is moved to the punching table of a punching apparatus.

In a 4th process, punching is carried out to the shape of the laminated board 1 which has the above structure by a punch, and the laminated board 1 punched by the receiving hole formed in the punching table is dropped. In this case, the dropped laminate 1 is laminated on the immediately punched laminate 1, and when pressurized by a punch, the laminated laminate 1 is laminated at the caulking portion 21. It is fixed. In this way, the laminated sheets 1 are stacked in succession.

According to the said manufacturing process, since the hoop material 5 is strip | belt-shaped, punching operation can be performed continuously.

In addition, since the laminated sheet 1 is formed in multiple sheets parallel to the width direction of the strip | belt-shaped hoop material 5, multiple laminated sheets 1 can be laminated | stacked simultaneously,

(2-2) Manufacturing Process of Insulating Layer 12

Next, the manufacturing process of the insulating layer 12 is demonstrated.

The insulating layer 12 is formed in the required part of the laminated board 1 laminated | stacked as mentioned above. This is because it is necessary to provide electrical insulation between the stator core 7 and the coil 8.

The laminated laminate 1 is housed inside a resin mold, and pre-molded with an insulating resin to form an insulating layer 12.

The part which forms the said insulating layer 12 is a part except the outer peripheral side of the back yoke 2 and the inner peripheral side of the tooth part 3, as shown in FIG.

That is, it is the long side part 2a of the back yoke 2, the both sides of the tooth part main body 3a, and the outer peripheral side of the converging part 3b.

4 and 5, the upper covering portion 14, the four upper supporting portions 15, and the positioning protrusions 19 are integrally formed at the same time as the insulating layer 12 on the back yoke 2, respectively. To form. In addition, the lower covering part 20 is integrally formed at the same time as the insulating layer 12 under the back yoke 2.

In the upper covering part 14, fixing holes for fixing the connecting pins 17 and 18 described later are formed. Moreover, four upper support parts 15 protrude from this upper cover part 14, and the upper support part 15 is a table for mounting the wiring board 51, and is also located from the upper support part 15. The crystal protrusion 19 protrudes integrally. And the upper support part 15 is formed in the 4th, 6th, 10th, and 12th tooth part 3 from the left end part of the straight core 16 as shown in FIG.

As mentioned above, the name of what formed the insulating layer 12 in the laminated | stacked laminated board 1 is called "straight core 16" below.

In addition, in the above description, the upper coating part 14 and the upper support part 15 are formed on the upper part of the back yoke 2, and the lower coating part 20 is formed on the lower part of the back yoke 2. Among these, the upper and lower parts are given names for convenience of understanding in FIGS. 4 and 5.

(2-3) Fixing process of connecting pins 17 and 18

Next, the fixing process of the connection pins 17 and 18 is demonstrated, referring FIG. 4 and FIG.

First, as shown in FIG. 4, the connection pin 17 of each phase of each phase is fixed to the outer peripheral part of the back yoke 2 in the straight core 16, or the upper covering part 14 of the vicinity of the outer peripheral part. Inserted into the hole, three are projected from the straight core 16. In detail, three connection pins 17 of each phase protrude from the right end of the straight core 16 to the outer circumference of the teeth 3 of any one of 1st, 2nd or 3rd.

Further, the U-shaped connecting pin 17 on the first tooth portion from the right end of the straight core 16, the V-shaped connecting pin 17 on the second tooth portion, and the W-shaped connecting pin 17 on the third tooth portion May protrude.

4 and 5, the connecting pin 18 for the neutral point is inserted into the fixing hole of the upper covering portion 14 near the outer circumference of the back yoke 2 or the outer circumference of the straight core 16. Then, one is projected from the straight core 16. In detail, one neutral point connecting pin 18 protrudes from the left end of the straight core 16 to the outer circumferential portion of any one of the first, second or third teeth 3.

(2-4) coil winding process

Next, the process of winding the three-phase coil 8 to the straight core 16 in which 12 slots were formed is demonstrated.

As shown in FIG. 3, the coil 8 is wound around the tooth main body 3a by turning the nozzle 9 through which the coil 8 penetrates around the tooth main body 3a of the stator core 7. At this time, the coil is wound in a state where the teeth 3 are arranged in parallel.

Since the stator 10 has twelve teeth 3, three nozzles 9, 9, 9 are arranged in parallel to correspond to the three teeth 3, 3, 3 and the coil is wound at the same time. . Then, the coil is wound around all 12 slots by winding the coil four times after winding the coil to the next slot.

In this case, in the straight core 16, the U phase winds the coil in the 1, 4, 7, and 10th slots from the left end, and the V phase winds the coil in the 2, 5, 8, and 11th slots from the left end. Wound, wound the coil in the 3rd, 6th, 9th, 12th slots from the left end of the W phase,

This makes it possible to perform the coil winding operation at high speed as compared with winding the coil on the ring-shaped stator core, and the number of windings of the coil can be adjusted freely.

In addition, since the coils 8 are wound in a state where the teeth 3 are arranged in parallel, the lamination factor of the coils 8 in each slot 6 is improved. That is, when the teeth 3 are arranged in parallel, the width between the tip of the converging portion 3b of one tooth 3 and the tip of the converging portion 3b of the adjacent tooth 3 is the width. The width of the opening 11 and the area inside the slot 6 are wider than the width of the opening 11 and the area inside the slot 6 after bending the back yoke 2 described later. In addition, since the coil 8 can be wound without having to consider the space for rotating the nozzle 9, the droplet ratio can be improved as compared with the conventional one.

In addition, since the number of the teeth 3 of the stator core 2 is 12 and the number of slots is not large, the coil work can be efficiently performed, and a motor can be produced in which workability and motor characteristics are balanced.

(2-5) Process of bus wiring

Next, the process of carrying out the bus wiring of the coil 8 of each phase and the coil 8 for neutral points is demonstrated, and also the star connection of three phases is performed.                     

One end of the U-phase coil 8 is connected to the U-phase connecting pin 17 and the other end is connected to the neutral-point connecting pin 18.

One end of the V-phase coil 8 is connected to the V-phase connecting pin 17, and the other end is connected to the neutral-point connecting pin 18.

One end of the W-phase coil 8 is connected to the W-phase connecting pin 17, and the other end is connected to the neutral-point connecting pin 18.

The bus wiring of the coil 8 of each phase to the neutral point connecting pin 18 is as shown in Fig. 5, namely, the other end of the U-phase coil 8 wound around the U-phase teeth 3 is formed. The lead is drawn to the upper side of the tooth 3 and then to the outer circumferential side through the upper cutout 14a in the upper sheath 14, and connected to the neutral point along the outer circumference of the upper sheath 14. Wiring is carried out to the pin 18 and connected to the connecting pin 18 for neutral points, the same is true of the other two-phase coil 8.

The bus wiring for each commercial connection pin 17 of the coil 8 of each phase is as shown in FIG. That is, one end of the U-phase coil 8 wound around the U-phase teeth 3 is drawn out to the lower side of the teeth 3, and then to the outer circumferential side through the lower cutout 20U in the lower coating 20. The lead is drawn out and connected to the U-phase connecting pin 17 by wiring up to the U-phase connecting pin 17 along the outer circumferential portion of the lower covering part 20. The same applies to the other two-phase coils 8. However, the depths of the lower cutout 20U, the lower cutout 20V of the V phase, and the lower cutout 20W of the W phase are formed deep in sequence so that the three-phase coils 8 do not contact each other. The upper coil 8 may be wired in parallel along the outer circumference of the lower sheath 20.

(2-6) Bending Process of Straight Core 16

Next, the bending process of the straight core 16 is demonstrated.

In the first step, as shown in Figs. 6 and 7, each notch part 4 of the straight core 16 on which the coil is wound is a point, and the teeth 3 are straight in the direction toward the axial center direction. The core 16 is bent.

In the second step, the back yoke 2 is bent to form a ring shape.

In a 3rd process, the joint surface of the both ends of the back yoke 2 is welded or fixed with an adhesive agent.

Thereby, the inner rotor type stator 10 is formed.

In addition, the cutting angle of the notch part 4 is made into the angle which the inclined surfaces of the notch part 4 may contact each other, when the back yoke 2 is formed in ring shape.

In addition, when the coil 8 wound around one tooth part 3 and the coil 8 wound around the adjacent tooth part 3 may come into contact with each other, an insulating plate ( Insert 13).

(2-7) Attachment Step of Wiring Board 51

Next, the attaching process of the wiring board 51 is demonstrated.

The wiring board 51 has a disc shape and a bushing 25 is provided in the outer peripheral portion. The bushing is made of synthetic resin and is used to pull out the plurality of cords 26 from the wiring board 51 to the outside of the motor 50.                     

As shown in FIG. 8, the disk-shaped wiring board 51 is mounted on the upper support part 15 of the stator 10. As shown in FIG. At this time, the cutouts 23 are provided in four places on the outer peripheral part of the wiring board 51, and the four positioning protrusions 19 are inserted in this position, respectively, and the positioning of the wiring board 51 and the stator 16 is carried out. Do it. In this case, since the upper support part 15 is formed in the 4th, 6th, 10th, and 12th tooth parts 3 from the left end of the straight core 16, when formed in ring shape, it is shown in FIG. As described above, since the upper support part 15 is disposed at four positions facing each other, the wiring board 51 can be stably placed, and the positioning by the positioning protrusion 19 coincides with the axis of the stator 10. Can be. Moreover, at the time of mold shaping | molding demonstrated later, since the positioning projection part 19 exists in four places facing each other, the wiring board 51 is not moved by mold resin.

In the wiring board 51, a wiring pattern 24 is formed, and four connection holes through which three phase connection pins 17 and one neutral connection pin 18 pass. It is. Then, as described above, the three connecting pins 17 and one neutral connecting pin 18 are inserted into the four connecting holes, respectively, when placed on the wiring board 51 and the stator 16. Soldering is performed with the wiring pattern.

Thereby, the coil 8 and the neutral point coil 8 of each phase can be simply connected to the wiring board 51. FIG.

(2-8) Manufacturing Process of Motor Frame 53

Next, the motor frame 53 will be described.                     

As described above, when the stator 10 holding the wiring board 51 is inserted into a motor plate made of a conventional steel plate to assemble the motor, the outer diameter of the stator 10 is not a circle, so the stator core 7 The shaft center based on the inner diameter of and the shaft center based on the outer diameter do not coincide. Therefore, it is difficult to assemble the motor based on the outer circumferential portion of the stator 10. That is, the adhesion accuracy of rotary bearings etc. which can be attached to the steel frame motor frame falls, and performance falls.

Therefore, in the present embodiment, the motor frame 53 is formed by molding with reference to the inner diameter of the stator 10 by insulating resin or premix (hereinafter referred to as "mold resin").

Specifically, as described above, the inner diameter portion of the stator 10 on which the wiring board 51 is held is inserted into a core bar of a water-receiving type (not shown), and the mold resin is closed at a high pressure after the mold is closed. Mold molding with

By such mold molding, the stator core 7, the wiring board 51, and the like are integrally covered with the mold resin 52 to form the motor frame 53.

As described above, the housing in which the bearing 55 supporting the rotor 56 is inserted, and the flange rabbit portion in which the bracket 54 is inserted, are formed on the basis of the inner diameter of the stator core 7 at the time of mold molding. 59 is formed simultaneously, so that the shaft centers of the inner diameter of the stator core 7 and the shaft centers of the housing and the shaft centers of the flange rabbit portion 59 coincide with each other, so that the air gap becomes a highly precise motor. . That is, the bearing housing portion can also be formed integrally with the motor frame 53 on the basis of the inner diameter portion of the stator 10, so that the inner diameter portion of the stator 10 and the shaft center coincide. In addition, since the flange rabbit portion 59 to which the other bracket 54 is coupled is also formed in the motor frame 53, the flange rabbit portion 59 also matches the inner diameter of the stator 10 and the shaft center.

Therefore, the motor frame 53 with high assembly precision is obtained.

(Second embodiment)

Next, a second embodiment of the joint surface of both ends of the back yoke 2 of the stator 10 will be described with reference to FIGS. 9 and 10.

As in the first embodiment, if the joining surfaces of both ends of the back yoke 2 are formed in a straight shape and only the outer peripheral side of the back yoke 2 is welded, the joining surfaces of the back yokes by the electromagnetic vibration generated in the radial direction The vicinity may form a waveform with the welded portion as a point, and may possibly resonate with the electromagnetic vibration. Therefore, in the second embodiment, the above problem is solved by making the joint surface 44 into a crank shape.

9 is an enlarged front view of the vicinity of the bonding surface 44 of the back yoke 2 according to the present embodiment, and FIG. 10 is an enlarged front view of the vicinity of the bonding surface 44 of the back yoke 2 when a gap is formed.

As described in the first embodiment, the stator 10 bends the straight core 16 in a ring shape.

The shape seen from the rotation axis direction of the joint surface 44 of the both ends of the back yoke 2 of the straight core 16 is a crank shape. And the protrusion 45a, 45b is formed in the outer peripheral surface of the both ends of the back yoke 2, respectively.

The back yoke 2 is bent to contact the projections 45a and 45b, and the laser exit port 46 is brought close to the projections 45a and 45b to be welded.

By configuring as described above, as shown in FIG. 10, even if a gap occurs in the joining surface 44 of the back yoke 2, the curved surface 44a in the middle of the joining surface 44 becomes a wall, and the laser is the back yoke. Since there is no possibility of reaching the inner peripheral part of (2), there is no possibility of damaging the coil 8.

Further, even if a gap occurs in the joint surface 44 of the back yoke 2, the curved surface 44a portion of the joint surface 44 is joined, so that a magnetic path (see arrow in FIG. 10) is secured. The flux flow is good.

Moreover, the back yoke 2 is joined at two points of the welded part (protrusion 45a, 45b part) and the curved surface 44a of the joining surface 44 by making the joining surface 44 into a crank shape. As a result, the rigidity of the joining surface 44 becomes high, and resonance hardly occurs. In addition, even when the stator 10 is mold-molded with a mold resin, the strength against the mold pressure is improved, and the case where the stator 10 is separated from the bonding surface 44 is eliminated.

In addition, the joining surface 44 of the stator 10 may be joined by adhesion.

The motor of the present invention is suitable for the rotation of fans and impellers such as air conditioners such as air conditioners, pumps, washing machines and air purifiers.

According to the present invention, a mold motor using a straight core can be reliably manufactured.

Claims (14)

A mold motor in which a motor frame is formed by molding the entire outer periphery except for the inner diameter of a stator composed of a straight core with an insulating mold resin around the stator core. The straight core has a plurality of teeth protruding from one side of the long side of a belt-shaped back yoke, and a V formed on the side from which the teeth protrude between the adjacent teeth of the back yoke. It consists of a laminated plate having a notch (notch) is laminated, In the straight core, at least a portion except the inner circumferential side of the teeth is pre-mold formed by an insulating resin to form an insulating layer. A connecting pin made of a plurality of conductors for wiring a coil protrudes from the insulating layer, These plurality of connecting pins are provided in the back yoke located at the outer circumference of the first to third teeth when counted from the teeth at the ends of the straight cores. The straight core has a coil wound around each tooth formed with the insulating layer, And the stator is bent at the notch portion of the straight core to form a ring shape, and the joining surfaces of both ends of the back yoke are joined by welding or adhesion. delete delete delete delete delete delete delete delete The method of claim 1, One of the connecting pins for the neutral point is installed on the back yoke which is located on the outer circumference of any one of the first to third teeth when counted from the teeth at one end of the straight core, Among the connecting pins, each phase connecting pin is provided on a back yoke located at the outer circumference of any one of the first to third teeth or the plurality of teeth when counted from the teeth at the other end of the straight core. Mold motor, characterized in that there is. The method of claim 1, The mold motor is a three-phase brushless DC motor, the number of teeth is 12, and the first, fourth, seventh, and tenth times when counted from the teeth at the ends of the straight cores. The U phase coil is wound around the teeth of the teeth, and the V phase coil is wound around the second, fifth, eighth, and eleventh teeth, and the third, sixth, ninth, A mold motor, characterized in that a coil in a W phase is wound around the twelfth tooth portion. delete delete The method of claim 1, A mold motor using the mold motor in an air conditioner, a pump, a washing machine or an air cleaner.

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