JPH11285182A - Motor stator - Google Patents

Abstract

(57) [Summary] To improve the mounting strength and mounting accuracy of a stator core to a base. SOLUTION: Since a circumferential width W1 of a narrow portion 24a is set smaller than a pitch P between notches 23,
When the belt-shaped core 20 is bent from the cutout portion 23 to form the stator core, the mounting pieces 24 are less likely to be in the way. Also,
Since the width W2 of the wide portion 24b in the circumferential direction is set to be larger than the pitch P between the notches 23, the through hole 2 having a large diameter is used.
The stator core can be fixed to the base by inserting a large-diameter bolt into 4c, thereby increasing the stator core mounting strength. In addition, since the mounting piece 24 is formed integrally with the stator core, the mounting piece 24 is hardly deformed, and the mounting accuracy of the stator core to the base 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 in which an annular core is formed by bending a belt-like core.

[0002]

FIG. 10 shows a stator of an outer rotor type three-phase DC brushless motor. Here, the stator core 1 is formed by bending the band-shaped core from a plurality of notches into an annular shape, and the resin layer 2 is formed on the stator core 1. A plurality of mounting pieces 3 are integrally formed on the resin layer 2.
The stator core 1 is fixed to the base as bolts 4 are inserted into the through holes 3a of the mounting pieces 3 and fastened to the base.

In the above configuration, since the stator core 1 is large, the diameter of the through-hole 3a is increased to use a large-diameter bolt 4, thereby improving the mounting strength of the stator core 1 to the base. However, the strength of the mounting piece 3 made of resin is insufficient, and the mounting piece 3 is deformed, and there is a possibility that the mounting accuracy of the stator core 1 to the base is deteriorated.
Therefore, as shown in FIG. 11, it is considered to insert an iron mounting piece 3 into the resin layer 2. However, it is necessary to increase the circumferential width W of the mounting piece 3 to increase the strength. Therefore, the attachment piece 3 hinders the bending of the band-shaped core from the cutout. Incidentally, reference numeral 1a in FIG. 11 indicates a butted surface where the inner surfaces of the cutouts of the band-shaped core are butted.

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 the mounting strength and the mounting accuracy without hindering the bending of the belt-shaped core. It is in.

[0005]

According to a first aspect of the present invention, there is provided a motor stator comprising: an annular core formed by bending a band-shaped core; and a mounting piece formed integrally with the annular core. A plurality of cutouts that are open on one surface of the band-shaped core are provided in the band-shaped core, and the mounting piece is a narrow portion located between the cutouts and an insertion member into which a mounting member for mounting the annular core to the base is inserted. A wide portion provided with a hole, the circumferential width of the narrow portion is set smaller than the pitch between the cutout portions located on both sides, and the circumferential width of the wide portion is positioned on both sides. The feature is that it is set to be larger than the pitch between the notched portions.

[0006] According to the above means, a narrow portion narrower than the pitch between the notches is provided at the base end of the mounting piece. For this reason, when the band-shaped core is bent from the cutout portion, the attachment piece is unlikely to be in the way, so that the band-shaped core can be easily bent. Also, a wide portion wider than the pitch between the notches is provided at the tip of the mounting piece. For this reason, a large-diameter insertion hole is formed in the wide portion, and the annular core can be fixed to the base using the large-diameter mounting member, so that the mounting strength of the annular core to the base is increased. Further, a mounting piece is integrally formed with the annular core. For this reason, the strength of the mounting piece is increased, and the mounting piece is less likely to be deformed, so that the mounting accuracy of the annular core to the base is improved.

According to a second aspect of the present invention, there is provided a stator for an electric motor, comprising a substantially horizontal resin layer covering one axial end face of an annular core and one axial end face of a mounting piece, wherein one end of the mounting piece in the axial direction is the annular core. Where the thick portion is provided in a concave portion between the axial end of the annular core and the axial end of the mounting piece in the resin layer. Has features. According to the above means, the thick portion is provided in the resin layer. For this reason, since the strength of the resin layer is increased, it is possible to prevent the resin layer from being cracked by the mounting force of the mounting member, thereby preventing the insulation performance from deteriorating. In addition, the resin layer is substantially horizontal. For this reason, the resin layer is prevented from protruding in the axial direction due to the influence of the thick portion, and the space occupied by the stator is reduced.

According to a third aspect of the present invention, the stator for the electric motor includes a resin layer covering one end in the axial direction of the annular core and one end in the axial direction of the mounting piece, and the resin layer has a thick portion protruding from the one end in the axial direction. It is characterized in that it is provided corresponding to the mounting piece. According to the above means, since the thickness of the thick portion is increased, the insulation performance is maintained even if the thick portion is cut by the mounting force of the mounting member.

According to a fourth aspect of the present invention, the stator of the electric motor is characterized in that the thickness of the thick portion in the axial direction is set to 3 mm or more. According to the above means, even if cracks occur due to the mounting force of the mounting member or vibration during operation, etc. in the thick part,
Since a legal insulation distance is secured, safety is improved.

According to a fifth aspect of the present invention, the stator of the electric motor is characterized in that it has a resin layer covering one axial end surface of the annular core and another resin layer covering one axial end surface of the mounting piece. . According to the above means, for example, a resin layer covering the annular core is formed from a resin having high heat resistance, and another resin layer covering the mounting piece can be formed from a resin having high mechanical strength. Reliability increases on both sides. Moreover, even if a crack occurs in the resin layer of the mounting piece due to the mounting force of the mounting member,
Since cracks are less likely to progress in the resin layer of the annular core, insulation is improved.

According to a sixth aspect of the present invention, the stator of the electric motor is characterized in that another resin layer has a cylindrical portion that covers the inner peripheral surface of the insertion hole. According to the above means, the mounting member in the insertion hole is double insulated, so that the insulating property is improved. Moreover, another resin layer can be attached to the mounting piece based on fitting the cylindrical portion into the insertion hole, so that it is not necessary to insert-mold another resin layer. The stator of the electric motor according to claim 7 is characterized in that another resin layer is formed by insert molding in which the annular core is housed in a mold and resin is injected. According to the above means,
Since the adhesiveness between the resin layer covering the mounting piece and the resin layer covering the annular core is increased, the strength of the resin layer covering the mounting piece is particularly improved. For this reason, the resin layer covering the mounting piece is hardly deformed, and the mounting accuracy of the annular core to the base is improved.

According to an eighth aspect of the present invention, the motor stator is characterized in that the mounting piece is divided into a plurality of mounting pieces separated in the axial direction. According to the above means, the resin is filled in the gap between the mounting pieces, and the adhesion between the mounting piece and the resin layer is enhanced. For this reason, the strength of the resin layer is improved, and the resin layer is hardly deformed by the mounting force of the mounting member or the like, so that the mounting accuracy of the annular core to the base is improved. The stator of the electric motor according to the ninth aspect is characterized in that the belt-shaped core is formed by laminating a plurality of steel plates, and the steel plates located at both ends of the band-shaped core are arranged so that the burrs face the other party. doing. According to the above-described means, when the annular core is stored in the mold for forming the resin layer, the burrs are prevented from being caught on the mold, so that the annular core can be easily stored in the mold. At the same time, when the resin layer is molded, the resin easily flows smoothly, so that cracks are less likely to occur in the resin layer.

According to a tenth aspect of the present invention, there is provided a stator for an electric motor, comprising a resin layer covering both end faces in the axial direction of the annular core and both end faces in the axial direction of the mounting piece, and a portion of the resin layer corresponding to the mounting piece in the axial direction. It is characterized in that the thickness is different between one side and the other side in the axial direction. According to the above means, for example, it is possible to increase the thickness of the resin layer on the side where the load of the stator or the mounting force of the mounting member is concentrated, to reduce the thickness of the resin layer on the opposite side, and to increase only the strength of a necessary portion of the resin layer. it can. For this reason,
Since the required portion of the resin layer is less likely to be deformed, the mounting accuracy of the annular core to the base is improved, and the increase in product weight and material cost is minimized.

According to the eleventh aspect of the present invention, in the motor stator, a width dimension from one circumferential surface of the wide portion to the inner peripheral surface of the insertion hole is different from a width dimension from one radial surface to the inner peripheral surface of the insertion hole. It has features in what it does. According to the above means, the width dimension from one surface in the circumferential direction of the wide portion to the inner peripheral surface of the insertion hole and the width dimension from one surface in the radial direction to the inner peripheral surface of the insertion hole are adjusted. The load of the stator can be efficiently received in the wide portion while securing the installation space.

[0015]

FIG. 1 shows a first embodiment of the present invention.
A description will be given with reference to FIG. First, in FIG.
A water receiving tank 12 is provided in the outer box 11. As shown in FIG. 3, an upper cup 13 is fixed to a bottom of the water receiving tank 12, and an outer ring of a rolling bearing 14 is fixed to the upper cup 13.

A lower cup 15 corresponding to a base is fixed to the upper cup 13. An outer ring of a rolling bearing 16 is fixed to the lower cup 15.
A cylindrical tank shaft 17 is fixed to the inner ring and the inner ring of the rolling bearing 16. As shown in FIG. 4, a washing tub 18 is fixed to the upper end of the tub shaft 17, and the washing tub 18 is housed in the water receiving tub 12.

A stator 19 is fixed to the lower cup 15, as shown in FIG. Hereinafter, the stator 19 will be described in detail. The strip-shaped core 20 of FIG. 1 has a form in which 36 unit cores 21 (only three are shown) are connected via a connecting bar 22. As shown in FIG. 5, the strip-shaped core 20 is formed by laminating a plurality of steel plates 20a. In each of the steel plates 20a located in the upper half, the burrs 20b are directed downward, and the lower half is formed. Each steel plate 20a located in
The burrs 20b are directed upward. As shown in FIG. 1, each unit core 21 has a straight unit yoke 21a and a T-shaped tooth 21b. Triangular cutouts 23 are formed at both ends of the unit core 21. Have been.

A plurality of unit cores 21 are connected to the connecting beam 2
A mounting piece 24 is formed integrally on one surface opposite to 2. Each of these mounting pieces 24 is composed of a narrow portion 24a located at the base end and a wide portion 24b located at the distal end, and each narrow portion 24a is arranged between the notches 23, The dimension W1 is set smaller than the pitch P between the notches 23. Each wide portion 24b has a width W2.
Is set larger than the pitch P between the notches 23.

A circular through hole 24c corresponding to an insertion hole is formed at the center of each wide portion 24b. The width Wa from one surface of each wide portion 24b to the inner peripheral surface of the through hole 24c is as follows. The width Wb from another surface to the inner peripheral surface of the through hole 24c is set to be larger than the width Wb. The symbol D indicates the diameter of the through hole 24c.

The height H1 in the axial direction of each mounting piece 24 is
As shown in FIG. 2B, the height of the belt-shaped core 20 in the axial direction is set to be smaller than the height H of the belt-shaped core 20. A step is formed between the lower end surface of the belt 24 and the lower end surface of the belt-shaped core 20. The height of each step is "(H-H1) / 2".
Is set to

The band-shaped core 20 is bent substantially annularly around each connecting bar 22, and the unit cores 21 located at both ends are welded. FIG. 2A shows a stator core 25 in which the band-shaped core 20 is bent in a substantially annular shape. The stator core 25 corresponds to an annular core, and a resin layer 26 made of PPS (polyphenylene sulfide) is formed on the stator core 25. The resin layer 26 is formed by insert molding in which the stator core 25 is housed in a mold (not shown) and molten PPS is injected, as shown in FIGS. 2 (a) and 2 (b). , The entire inner surface of the stator core 25 and both end surfaces in the axial direction, the entire surface of each mounting piece 24, the inner surface of each through hole 24c, and the entire outer surface of each tooth 21b.

Each end plate 26a of the resin layer 26 is formed horizontally as shown in FIG. 2 (b). Each of these end plate portions 26a is a plate-like portion that covers the axial end surface of the stator core 25 and the axial end surface of the mounting piece 24, and the resin layer 26 is provided with a plurality of thick portions 26b. Each of these thick portions 26b is a portion that fills a step between the mounting piece 24 and the stator core 25, and the axial thickness T2 of each thick portion 26b is set to 3 mm or more. The symbol T1 indicates the axial thickness of the end plate 26a. The stator 19 is configured as described above.

As shown in FIG. 3, a coil 27 is wound around each of the teeth 21b from above the resin layer 26.
Further, bolts 28a are provided in the through holes 24c of the respective mounting pieces 24.
Are inserted from below. A nut 28b is fastened to the upper end of each bolt 28a.
Are fixed to the lower cup 15 by a plurality of sets of bolts 28a and nuts 28b. Reference numeral 28 indicates a bolt 2
8 shows a mounting member composed of a nut 8a and a nut 28b.

A stirring shaft 30 is housed in the tub shaft 17, and a stirring body 31 is fixed to the upper end of the stirring shaft 30 in the washing tub 18 as shown in FIG. A rotor 32 is fixed to the portion as shown in FIG.
The rotor 32 constitutes a three-phase DC brushless motor 33 together with the stator 19. The rotor 32 has a disk-shaped rotor yoke 32 a made of an iron plate, and 24 rotor magnets 32 b mounted on the inner peripheral surface of the rotor yoke 32 a. Cylindrical resin part 3 adhered to the peripheral wall of rotor yoke 32a
2c and a plurality of radial resin plate portions 32d.

The resin portion 32c and the plurality of resin plate portions 32d
Is to temporarily fix 24 rotor magnets 32b on the inner peripheral surface of the rotor yoke 32a by magnetic force,
a is housed in a molding die (not shown) and formed by insert molding in which molten resin is injected, and the resin portion 32c fixes 24 rotor magnets 32b to the rotor yoke 32a.

At the upper end of the outer box 1, as shown in FIG.
A control circuit board 34 is provided.
Is mounted with a control device mainly composed of a microcomputer, a power supply circuit for converting a commercial AC power supply to a DC power supply, and an inverter circuit (all not shown) formed by bridging six triacs. The output side of this inverter circuit is connected to each coil 27, and the control device
With the PWM control of each triac of the inverter circuit, drive power is supplied to each coil 27 from the power supply circuit through the inverter circuit.

As shown in FIG. 3, a clutch holder 35 is fixed between the lower cup 15 and the rotor 32 on the outer periphery of the tank shaft 17, and a clutch 36 is fixed to the clutch holder 35. It is mounted so as to be rotatable around 36a. The clutch 36 is connected to a clutch drive mechanism (neither is shown) using a clutch motor as a drive source, and at the time of washing, the control device controls the clutch motor to drive the clutch 36 with an arrow A. In the direction of arrow A during dehydration.

A dewatering protrusion 36b is formed on the lower surface of the clutch 36. As shown by a two-dot chain line, when the clutch 36 rotates in the direction opposite to the arrow A during dewatering, the dewatering protrusion 36b is formed.
Are engaged between the resin plate portions 32b of the rotor 32. Then
The tub shaft 17 is connected to the rotor 32 via the clutch 36, and the washing tub 18 rotates at the target speed in synchronization with the stirring body 31.

A washing projection 36c is formed on the upper surface of the clutch 36. Further, a hole-shaped clutch engaging portion 15a is formed in the lower cup 15, and as shown by a solid line, when the clutch 36 rotates in the direction of arrow A during washing,
The washing protrusion 36c is engaged in the clutch engaging portion 15a.
Then, the rotation of the tank shaft 17 is restrained via the clutch 36 and the lower cup 15, so that the stirring body 31 rotates independently at the target speed.

According to the above embodiment, the narrow portion 24a narrower than the pitch P between the notches 23 is provided at the base end of the mounting piece 24. For this reason, when the band-shaped core 20 is bent from the cutout portion 23, the attachment piece 24 is unlikely to be in the way, and the work of bending the band-shaped core 20 becomes easy. Further, a wide portion 24b wider than the pitch P between the notches 23 is provided at the tip of the mounting piece 24. For this reason, the large-diameter through hole 24c is formed in the wide portion 24b.
Is formed, and the stator core 2 is formed using the large-diameter bolt 28a.
5 can be fixed to the lower cup 15 so that the stator core 25
The mounting strength to the lower cup 15 is improved. Further, the attachment piece 24 was formed integrally with the belt-shaped core 20. For this reason, the strength of the mounting piece 24 is increased, and the mounting piece 24 is hardly deformed, so that the mounting accuracy of the stator core 25 to the lower cup 15 is improved. In addition, vibration during operation is attenuated by the narrow portion 24a and is difficult to be transmitted to the wide portion 24b. Therefore, the bolt 28a and the nut 28b are loosened by vibration during operation and the mounting strength of the stator core 25 is prevented from being reduced. Is done.

The resin layer 26 has a thick portion 26b. For this reason, since the strength of the resin layer 26 is increased, cracks and the like are generated in the resin layer 26 when the bolts 28a and the nuts 28b are mounted, thereby preventing the insulation performance from deteriorating. At the same time, the strength of the resin layer 26 is improved and the resin layer 2
6 becomes difficult to deform, so that the mounting accuracy of the stator core 25 is further improved. In addition, the end plate 26a of the resin layer 26 was formed horizontally. For this reason, since the end plate portion 26a is prevented from partially protruding due to the influence of the thick portion 26b, the space occupied by the stator 19 is reduced.

The thickness T2 of the thick portion 26b is set to 3 mm or more. Therefore, the bolt 28a and the nut 2
Even if cracks occur in the thick portion 26b due to the fastening force of the 8b, vibration during operation, or the like, the legal insulation distance described in the Electrical Appliance and Material Control Law (specifically, 2.0 mm, 150 V
2.5 mm) is ensured, so that safety is improved.

Further, the steel plates 20a located at both end surfaces of the strip-shaped core 20 are arranged such that the burrs 20b face the other side.
Therefore, when the stator core 25 is stored in the mold, the burrs 20b are less likely to be caught by the mold, and the stator core 25 is easily stored in the mold. At the same time, the resin easily flows when the resin layer 26 is formed.
Cracks hardly occur in No. 6.

Further, the width Wa from the circumferential surface of the wide portion 24b to the inner circumferential surface of the through hole 24c is set larger than the width Wb from the radial surface to the inner circumferential surface of the through hole 24c. A space for accommodating the clutch 36 and the like is secured on the inner peripheral portion of the stator 19 without being disturbed by the wide portion 24b, and the load of the stator 19 can be efficiently received by the wide portion 24b.

Next, a second embodiment of the present invention will be described with reference to FIG. 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. Each mounting piece 24 is provided on the resin layer 26.
Thick portion 26c that fills the step between stator and stator core 25
Are formed, and each thick portion 26c projects in the axial direction from the end plate portion 26a.

According to the above embodiment, the resin layer 26 is provided with the thick portion 26c projecting from the end plate portion 26a. For this reason,
Since the thickness T3 of the thick portion 26c increases, the insulation performance is maintained even if the thick portion 26c is shaved by the fastening force between the bolt 28a and the nut 28b. At the same time, the strength of the thick portion 26c is improved, and the thick portion 26c is not easily deformed, so that the mounting accuracy of the stator core 25 to the lower cup 15 is improved.

In the second embodiment, the mounting piece 2
Although the axial end face of No. 4 is recessed with respect to the axial end face of the stator core 25, the present invention is not limited to this. For example, both may be arranged on the same horizontal plane. Even in the case of this configuration, the thickness of the thick portion 26c is increased, so that the insulation performance and the mounting accuracy are improved.

Next, a third embodiment of the present invention will be described with reference to FIG. 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. The axial height H1 of each mounting piece 24 is set equal to the axial height H of the stator core 25, and both axial end faces of each mounting piece 24 are in the same horizontal plane as the axial both end faces of the stator core 25. Is placed on top. In the resin layer 26, openings 26d are formed at both axial end faces of each mounting piece 24, and both axial end faces of each mounting piece 24 are exposed to the outside through the opening 26d. .

Each mounting piece 24 is provided with a resin layer 37 made of PET (polyethylene terephthalate). Each of these resin layers 37 is a bush 3 having a substantially T-shaped cross section formed by integrally forming an annular plate portion 38a and a circular cylindrical portion 38b.
8 and an annular flange 39. Each bush 38 is mounted on the mounting piece 24 by pushing the cylindrical portion 38b into the through hole 24c, and the outer peripheral surface of the cylindrical portion 38b. The collar 39 is pushed out of the through hole 24c to prevent it from being pulled out. Then, each plate portion 38a is formed of the resin layer 2
6, the cover 26 covers one end in the axial direction of the mounting piece 24, the cylindrical portion 38b covers the inner peripheral surface of the through hole 24c, and the flange 39 closes the opening 26d of the resin layer 26 for mounting. Piece 2
4 covers the other end surface in the axial direction.

According to the above embodiment, the axial end face of the stator core 25 is covered with the resin layer 26, and the axial end face of the mounting piece 24 is covered with another resin layer 37. For this reason, the resin layer 26 can be formed from PPS or the like having high heat resistance and moldability, and the resin layer 37 can be formed from PET or the like having high mechanical strength. Therefore, reliability is improved in both heat resistance and mounting strength. Moreover, even if a crack occurs in the resin layer 37 due to the fastening force of the bolt 28a and the nut 28b, the crack does not easily progress in the resin layer 26, so that the insulating property is improved.

The inner peripheral surface of the through hole 24c was covered by the cylindrical portion 38b of the resin layer 37. For this reason, the bolt 28a is double insulated, and the insulation is improved. In addition, the bush 3 is merely inserted by fitting the cylindrical portion 38b into the through hole 24c.
8 can be attached to the mounting piece 24, so that it is not necessary to insert-mold the resin layer 37 into the stator core 25.

In the third embodiment, the mounting piece 2
4, the resin layer 37 is separately assembled. However, the present invention is not limited to this. For example, the stator core 25 is housed in a molding die (not shown) and inserted into the molten PET by insert molding. 37 may be formed. In the case of this configuration, the adhesiveness between the resin layer 37 and the resin layer 26 is increased, so that the strength of the resin layer 37 is particularly improved. For this reason, since the resin layer 37 is less likely to be deformed, the mounting accuracy of the stator core 25 to the lower cup 15 is improved.

Next, a fourth embodiment of the present invention will be described with reference to FIG. 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. Each mounting piece 24 is divided into a plurality of mounting pieces 38 that are spaced apart in the axial direction. These mounting pieces 38 are formed by laminating a predetermined number of first steel plates and then laminating a predetermined number of second steel plates having a shape different from that of the first steel plate. The gap is filled with a PPS resin forming the resin layer 26.

According to the above embodiment, since the mounting piece 24 is divided into a plurality of mounting pieces 38 which are spaced apart in the axial direction, the gap between the mounting pieces 38 is filled with resin, and the mounting piece 24 and the resin layer 26 are separated. Adhesion with Therefore, the strength of the resin layer 26 is improved, and the resin layer 26 is
Since the deformation becomes difficult due to the fastening force of b, the mounting accuracy of the stator core 25 to the lower cup 15 is improved.

In the fourth embodiment, a plurality of mounting pieces 38 are formed by laminating a predetermined number of first steel plates and then laminating a predetermined number of second steel plates. However, the present invention is not limited to this. However, for example, when the mounting piece 24 is subjected to cutting or the like after the formation of the mounting piece 24,
May be divided into a plurality of mounting pieces 38.

Next, a fifth embodiment of the present invention will be described with reference to FIG. 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. Each mounting piece 24 is formed so as to be biased above the stator core 25 (toward the lower cup 15), and the thickness T4 of the thick portion 26b on the lower cup 15 side is greater than the thickness T5 of the thick portion 26b on the opposite side. It is set small.

According to the above embodiment, the lower thick portion 26b on which the load of the stator 19 and the fastening force of the bolt 28a act.
And the upper thick part 26b on the opposite side is thinned. For this reason, only the strength of the required portion is increased and the required portion is not easily deformed.
5, and the increase in product weight and material cost can be minimized.

In the first to fifth embodiments, the teeth 21b are formed integrally with the stator core 25. However, the present invention is not limited to this. For example, the teeth may be press-fitted into the annular core. In the first to fifth embodiments, the stator core 25 is bent in a substantially annular shape. However, the present invention is not limited to this. For example, the stator core 25 may be bent in a square ring shape.

In the first to fifth embodiments,
The through hole 24c is formed in the wide portion 24b of the mounting piece 24. However, the present invention is not limited to this. For example, a groove-like insertion hole that is open at both axial end surfaces and one radial surface is formed. The bolt 28a may be inserted into the hole.

In the first to fifth embodiments,
The notches 23 are formed at equal pitches in the belt-shaped core 20, but the present invention is not limited to this. For example, the notches 23 are formed at unequal pitches, and the narrow portions 24a of the mounting pieces 24 are formed with notches having a small pitch. It may be arranged between the notches or between the notches having a large pitch. In short, the circumferential width of the narrow portion 24a is set smaller than the pitch between the notches 23 adjacent on both sides, and the circumferential width of the wide portion 24b is set smaller than the pitch between the notches 23 adjacent on both sides. It should just be set large.

In the first to fifth embodiments,
Although the bolt 28a is inserted into the through hole 24c of the mounting piece 24, the present invention is not limited to this. For example, a rivet may be inserted and the stator core 25 may be fixed to the lower cup 15 by rivets.

In the first to fifth embodiments,
The steel plates 20a located in the upper half in the axial direction are laminated such that the burrs 20b are directed downward, and the steel plates 20a located in the lower half in the axial direction are laminated such that the burrs 20b are directed upward. The present invention is not limited to this, and the point is that the steel plates 20a located at both ends in the axial direction may be arranged so that the burrs 20b are directed to the other party. Alternatively, a plurality of steel plates 20a may be stacked such that the burrs face in the same direction.

In the first to fifth embodiments,
Although the present invention is applied to the stator of the DC brushless outer rotor type motor, the present invention is not limited to this. For example, the present invention may be applied to the stator of a DC brushless inner rotor type motor. In this case, the band-shaped core 20 of FIG.
It is preferable to form a notch that opens upwards and to bend the band-shaped core 20 from the notch.

In the first to fifth embodiments,
Although the present invention is applied to a motor of a washing machine, the present invention is not limited to this, and may be applied to, for example, a motor for driving a drum of a clothes dryer, a motor for driving a fan of a ventilation fan, and the like.

[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, since the narrow portion is provided at the base end of the mounting piece, the bending operation of the band-shaped core is facilitated. Further, since the wide portion is provided at the distal end of the mounting piece, the mounting strength of the annular core to the base is improved. Further, since the mounting piece is formed integrally with the belt-shaped core, the mounting accuracy of the annular core to the base is improved. According to the second aspect of the present invention, since the thick portion is provided in the resin layer, it is possible to prevent a crack from occurring in the resin layer due to the mounting force of the mounting member, thereby preventing the insulation performance from deteriorating. At the same time, the resin layer is less likely to be deformed, so that the mounting accuracy of the annular core to the base is improved. In addition, since the resin layer is formed substantially horizontally, the resin layer is prevented from partially protruding due to the effect of the thick portion, and the space occupied by the stator is reduced.

According to the third aspect of the present invention, since the thick portion protruding from the axial end face is provided on the resin layer, even if the thick portion is cut off by the mounting force of the mounting member or the like, the insulating performance is improved. Will be maintained. At the same time, the strength of the resin layer is improved and the resin layer is less likely to be deformed, so that the mounting accuracy of the annular core to the base is improved. According to the fourth aspect, the thickness of the thick portion is set to 3 mm or more. For this reason, even if a crack occurs in the thick portion due to the mounting force of the mounting member, vibration during operation, or the like, a legal insulation distance is ensured, and safety is improved.

According to the fifth aspect, the axial end face of the annular core and the axial end face of the mounting piece are covered with separate resin layers. For this reason, the resin layer covering the annular core can be formed from a resin having high heat resistance, and the resin layer covering the mounting piece can be formed from a resin having high mechanical strength, so that reliability is improved in both heat resistance and mounting strength. . Moreover, even if a crack occurs in the resin layer covering the mounting piece due to the mounting force of the mounting member, the crack does not easily progress in the resin layer covering the annular core, so that the insulating property is improved.

According to the sixth aspect of the present invention, the inner peripheral surface of the insertion hole of the mounting piece is covered with the cylindrical portion of the resin layer. For this reason,
Since the mounting member in the insertion hole is double-insulated, the insulation is improved. In addition, since the resin layer can be mounted on the mounting piece based on the fitting of the cylindrical portion into the insertion hole, it is not necessary to insert-mold the resin layer on the mounting piece. According to the means of claim 7, since the resin layer of the mounting piece is insert-molded on the annular core, the strength of the resin layer of the mounting piece is improved. For this reason, since the resin layer of the mounting piece is less likely to be deformed, the mounting accuracy of the annular core to the base is improved.

According to the means of claim 8, since the mounting piece is divided into a plurality of mounting pieces separated in the axial direction, the gap between the mounting pieces is filled with resin, and the gap between the mounting piece and the resin layer is formed. Adhesion increases. For this reason, the strength of the resin layer is increased and the resin layer is hardly deformed, so that the mounting accuracy of the annular core to the base is further improved. According to the ninth aspect of the present invention, since the steel plates located at both ends of the belt-shaped core are arranged so that the burrs face the other side, the annular core can be easily stored in the mold for forming the resin layer. At the same time, the resin easily flows at the time of molding the resin layer, so that cracks are less likely to occur in the resin layer.

According to the tenth aspect, the axial thickness of the portion of the resin layer corresponding to the mounting piece is made different on one side and the other side, so that only the strength of the necessary portion is increased. Can be. For this reason, since the required portion is hardly deformed, the mounting accuracy of the annular core to the base is improved, and
Increases in product weight and material costs are minimized. Claim 1
According to the means described in (1), the width dimension from one circumferential surface of the wide portion to the inner peripheral surface of the insertion hole is different from the width dimension from one radial surface to the inner peripheral surface of the insertion hole. For this reason, the load of the stator can be efficiently received in the wide portion while securing the installation space for the peripheral components.

[Brief description of the drawings]

FIG. 1 shows a first embodiment of the present invention (a plan view showing a developed core).

FIG. 2 is a cross-sectional view showing a stator core and a resin layer (a is a cross-sectional view along line X1-X1, and b is a cross-sectional view along line X2-X2)

FIG. 3 is a sectional view showing a state in which the motor is attached to the washing machine.

FIG. 4 is a sectional view showing the overall configuration of the washing machine.

FIG. 5 is a sectional view showing a laminated state of steel sheets.

FIG. 6 is a view corresponding to FIG. 2B showing a second embodiment of the present invention.

FIG. 7 shows a third embodiment of the present invention and corresponds to FIG.

FIG. 8 is a view corresponding to FIG. 2B showing a fourth embodiment of the present invention.

FIG. 9 shows a fifth embodiment of the present invention and is equivalent to FIG.

10 is a diagram showing a conventional configuration and corresponding to FIG.

FIG. 11 is a diagram corresponding to FIG. 2A showing another conventional configuration.

[Explanation of symbols]

15 is a lower cup (base), 19 is a stator, 20 is a strip-shaped core, 20a is a steel plate, 20b is a burr, 21b is a tooth, 23 is a cutout portion, 24 is a mounting piece, 24a is a narrow portion, 2a
4b is a wide portion, 24c is a through hole (insertion hole), 25 is a stator core (annular core), 26 is a resin layer, 26b is a thick portion, 26c is a thick portion, 27 is a coil, 28 is a mounting member,
37 indicates a resin layer, and 38 indicates a mounting piece.

Claims (11)

[Claims] An annular core formed by bending the band-shaped core; and a mounting piece integrally formed with the annular core, wherein the band-shaped core has a plurality of openings formed on one surface of the band-shaped core. The mounting piece has a narrow portion located between the notches, and a wide portion provided with an insertion hole into which a mounting member for mounting the annular core to the base is inserted. The width of the narrow portion in the circumferential direction is set to be smaller than the pitch between the notches located on both sides, and the width of the wide portion in the circumferential direction is larger than the pitch between the notches located on both sides. An electric motor stator characterized by being set. 2. A substantially horizontal resin layer which covers one end in the axial direction of the annular core and one end in the axial direction of the mounting piece, wherein one end in the axial direction of the mounting piece is located at one end in the axial direction of the annular core. The resin layer is provided with a thick portion located at a concave portion between one axial end surface of the annular core and one axial end surface of the mounting piece. The stator of an electric motor according to claim 1. 3. A resin layer covering one end in the axial direction of the annular core and one end in the axial direction of the mounting piece, wherein the resin layer has a thick portion protruding from one end in the axial direction corresponding to the mounting piece. The stator of an electric motor according to claim 1, wherein the stator is provided. 4. The electric motor stator according to claim 2, wherein the thick portion has an axial thickness of 3 mm or more. 5. The stator of an electric motor according to claim 1, further comprising: a resin layer covering one axial end surface of the annular core; and another resin layer covering one axial end surface of the mounting piece. 6. The stator for an electric motor according to claim 5, wherein the another resin layer has a cylindrical portion that covers an inner peripheral surface of the insertion hole. 7. The electric motor stator according to claim 5, wherein the another resin layer is formed by insert molding in which the annular core is housed in a mold and resin is injected. 8. The stator for an electric motor according to claim 1, wherein the mounting piece is divided into a plurality of mounting pieces separated in the axial direction. 9. The belt-shaped core is formed by laminating a plurality of steel plates, and the steel plates located at both ends of the band-shaped core are arranged such that the burrs face the other side. The stator of the motor as described. 10. A resin layer covering both axial end faces of the annular core and axial end faces of the mounting piece, and a portion of the resin layer corresponding to the mounting piece has an axial thickness of:
The stator of an electric motor according to claim 1, wherein the one side and the other side in the axial direction are different. 11. The width dimension from one circumferential surface of the wide portion to the inner circumferential surface of the insertion hole is different from the width size from one radial surface to the inner circumferential surface of the insertion hole. The stator of an electric motor according to claim 1, wherein