JPH10271720A - Stator in mold motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mold motor made up of a stator core molded with synthetic resin and having good heat radiation and good in productivity. SOLUTION: A molded motor has a stator core 2, in which a winding 3 is molded with synthetic resin 4. The molded motor has a ring-shaped groove 7 between an outer circumferential part of a bearing housing 5 and an inner circumferential part of the winding 3. As a result, heat from the stator core 2 and the winding 3 is prevented from transmitted to bearings 6 and 14. In addition, the amount of resin is reduced, so the productivity can be enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor used, for example, for driving a blower of a home appliance, and more particularly to a molded motor in which a stator core and a winding are integrally formed of a synthetic resin material for the purpose of reducing noise and vibration. The stator.

[0002]

2. Description of the Related Art A motor used for driving a blower of a home electric appliance or the like is strongly required to have low noise and low vibration due to the characteristics of its use environment.

To meet this demand, there has been proposed a molded motor in which a stator core and windings and, in some cases, a circuit board on which electronic components are mounted are integrally formed of a synthetic resin, and this type of motor has become mainstream at present. ing. Hereinafter, a conventional molded motor will be described with reference to FIGS. 9 and 10. FIG.

FIG. 9 is an external perspective view of a conventional molded motor, and FIG. 10 is a sectional view of the conventional molded motor. The stator 50 of the molded motor winds a winding 52 around a stator core 51 via a bobbin, and then the stator core 5
Except for the inner peripheral surface of No. 1, it is integrally formed so as to be surrounded by the synthetic resin material 53. Stator core 5 of stator 50
The inner side of the inner peripheral surface of the housing 1 is a space for accommodating the rotor 54. A bearing housing 56 for accommodating a bearing 55 a for rotatably supporting the rotor 54 is integrally formed of a synthetic resin material 53 on one end face of the stator 50. The other end surface of the stator 50 has an opening, and is covered with a steel plate bracket 58 having a bearing storage portion 57 in which the bearing 55b is stored after the rotor 54 is inserted. The rotor 54 has a permanent magnet 60 disposed on the outer periphery of a rotor core 59, and a shaft 61 is press-fitted into the rotor core 59, and the shaft 61 has bearings 55 a and 55.
b, it is rotatably supported by the stator 50.

[0005] With the above structure, the vibrations generated in the stator core 51 and the windings 52 are suppressed by the synthetic resin material 53 covering them, so that it is possible to provide a motor with little vibration and excellent quietness.

[0006]

However, in the molded motor having the above structure, the stator core 51, the winding 52,
Further, in some cases, since a circuit board or the like on which electronic components are mounted is covered with resin, there is a problem that heat dissipation is poor. Further, in this type of mold motor, there is a problem that the curing time of the synthetic resin is long and the productivity is not good during resin molding, and this tendency becomes more remarkable as the amount of the synthetic resin increases.

The present invention solves such a conventional problem, and provides a molded motor having good heat dissipation and good productivity.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention has a groove provided on an end face of a molded motor stator near a bearing housing and on an inner diameter side of a winding. With the groove, the heat radiation effect can be improved by increasing the surface area, and at the same time, the conduction of heat generated from the winding to the bearing can be blocked by the groove, thereby suppressing a rise in bearing temperature.

According to the present invention, a hole having a large surface area penetrating in the axial direction is provided in the resin portion of the molded motor stator. As a result, the surface area of the stator resin surface can be increased and the heat radiation effect can be improved.

Further, in the present invention, the position of the hole penetrating in the axial direction is arranged in the slot space remaining after the winding is wound around the stator core. As a result, heat can be efficiently radiated from the inner diameter portion where heat is easily stored.

As described above, in the stator of the molded motor according to the present invention, by providing grooves or holes in the synthetic resin portion, the surface area is increased to improve the heat radiation effect, and the heat generated by the winding is hardly transmitted to the bearing. Not only that, it is possible to reduce the amount of synthetic resin to be used, thereby saving resources and shortening the molding time. Therefore, it is possible to provide an inexpensive mold motor stator with high productivity.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention described in claim 1 of the present invention is that a stator core and a winding wound therearound are integrally formed of a synthetic resin material so as to surround at least an inner peripheral surface of the stator core. A stator for a molded motor, which is integrally formed of the synthetic resin with a bearing housing for covering a bearing at a center position in a radial direction on one end face thereof, the bearing housing being provided on one end face. And a groove is provided on the inner diameter side with respect to the winding, and has an effect of increasing the surface area by the groove and at the same time, preventing heat conduction from the winding to the bearing.

According to a second aspect of the present invention, there is provided a molded motor in which a stator core and a winding wound therearound are covered with a synthetic resin material by integral molding so as to surround at least an inner peripheral surface of the stator core. It is a stator that has a hole with irregularities on the wall surface, penetrating in the axial direction at a position avoiding the windings and the stator core, and has the effect of securing a large heat dissipation area due to the irregularities on the wall surface of the hole. Have.

According to a third aspect of the present invention, there is provided a molded motor in which a stator core and a winding wound therearound are covered with a synthetic resin material by integral molding so as to surround at least an inner peripheral surface of the stator core. A stator that penetrates in the axial direction at a position avoiding the windings and the stator core, and has a hole internally divided into a plurality of sections by walls, and a wall that divides the inside of the hole has a larger size. It has an effect that a heat radiation area can be secured.

According to a fourth aspect of the present invention, there is provided the stator of the molded motor according to the second or third aspect, wherein the position of the hole penetrating in the axial direction remains after the winding is wound around the stator core. Since it is located in the slot space, the heat can be efficiently radiated from the inner diameter portion where heat is easily stored.

According to the fifth aspect of the present invention, the hole penetrating in the axial direction is larger in the vicinity of the opening than in the other portions, and is possible in the end face portion where no winding or the like is arranged. Enlarging the hole as much as possible has the effect of reducing the amount of resin and simultaneously increasing the heat dissipation area.

According to a sixth aspect of the present invention, the steel plate bracket can be fixed to the stator by utilizing the holes.

[0018]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a perspective view of a molded motor according to Embodiment 1 of the present invention, and FIG. 2 is a sectional view thereof. 1 and 2, reference numeral 1 denotes a stator obtained by winding a winding 3 around a stator core 2 via an electric insulator (not shown), and removing a synthetic resin material 4 except for at least the inner peripheral surface of the stator core 2. It is integrally formed so as to be surrounded by. Reference numeral 5 denotes a bearing housing integrally formed of a synthetic resin material 4 on one end face of the stator 1 and accommodates a bearing 6. Reference numeral 7 denotes one end face of the stator 1 and a bearing housing 5.
And a substantially ring-shaped groove formed on the inner diameter side of the winding 3. The other end surface of the stator 1 has an opening for inserting the rotor 8. The rotor 8 has a shaft 11 press-fitted and fixed through a radial center of a rotor core 10 having a permanent magnet 9 arranged on the outer periphery. The steel plate bracket 12 has a bearing bracket 13 as a part thereof,
A bearing 14 is housed in the bearing bracket 13. The rotor 8 is housed in a space inside the inner peripheral surface of the stator 1, and is rotatably supported by the bearings 6 and 14.

As described above, in the first embodiment of the present invention, the heat radiation area of the stator 1 can be increased by the groove 7 provided between the winding 3 and the bearing housing 5, so that the temperature rise can be reduced. At the same time, since the heat conduction between the winding 3 and the bearing 5 is hindered by the groove 7, the bearing temperature can be significantly reduced as compared with the conventional stator of the molded motor. As a result, even when the bearing is used at a relatively high ambient temperature, the operating temperature condition of the bearing is greatly relaxed as compared with the conventional molded motor, so that it is not necessary to use an expensive heat-resistant bearing. Alternatively, when a bearing having the same level of heat resistance is used, deterioration of the bearing due to temperature is greatly reduced, so that an excellent effect that the life of the bearing can be extended can be obtained.

Further, in the first embodiment, the amount of the synthetic resin is reduced by the amount of the groove 7, so that it is possible to save resources and to shorten the molding time.

In the first embodiment, the groove 7 is described as a ring. However, the groove 7 may be an arc-shaped groove divided into a plurality of portions, and the shape is not limited to a ring or an arc, but may be a polygon or a circle. It goes without saying that the shape may be spiral or any other shape.

(Embodiment 2) FIG. 3 is a perspective view showing a stator core and windings of a molded motor according to Embodiment 2 of the present invention before they are integrally formed of a synthetic resin material.
FIG. 2 is a perspective view of a molded motor. 3 and 4, the same components as those of the molded motor according to the first embodiment are denoted by the same reference numerals.

In FIG. 3, reference numeral 2 denotes a stator core, and the winding 3 is wound via a winding frame 15. The winding 3 is concentratedly wound around a slot of the stator core 2, and a space 16 is formed between adjacent windings in the slot so that a nozzle of a winding machine passes therethrough.

The stator 17 shown in FIG. 4 is integrally formed of a synthetic resin material so as to surround the stator core 2 and the windings 3 configured as described above except for the inner peripheral surface of the stator core 2. Numeral 18 is a hole penetrating in the axial direction with openings on both side end surfaces of the stator 17, and has a plurality of irregularities 19 connected to the wall surface in the axial direction. The hole 18 is arranged so as to pass through the space 16 between adjacent windings in the slot.

(Embodiment 3) FIG. 5 shows a hole 2 penetrating in the axial direction.
It is divided into a plurality of sections by a thin wall 21 in order to secure a large surface area of 0, and the other configuration is the same as that of FIG.

With this configuration, the heat of the portion far from the surface of the stator can be dissipated from the hole 20, so that the temperature rise in the central portion of the stator can be suppressed low. Also,
Since the thickness of the resin in the slot portion is reduced, the curing time of the resin is shortened, and the productivity is improved.

(Embodiment 4) FIG. 6 shows an example in which a stepped hole 23 is provided in the stator 22 and the outside diameter of the stepped hole 23 is increased. Further, a portion having the smallest diameter of the stepped hole 23 is used as the screw hole 24. FIG. 7 is a cross-sectional view of a molded motor according to the fourth embodiment. The same components as those in the first, second, and third embodiments are denoted by the same reference numerals. Hole 23 is used for winding 3
The stator core 2 penetrated through the space 16 in the slot. The portion close to the end of the hole 23 can have a large hole diameter. By increasing the hole diameter, the heat radiation area can be increased and the amount of resin can be reduced. When a portion having a small hole diameter is used as the screw hole 24, the screw 25 penetrating the screw hole 24 has a role of fixing the motor to the device main body or a role of fixing the steel plate bracket 12 to the stator 22. Steel plate bracket 1
When press-fitting the stator 2 into the stator 22, it is not necessary to fix the steel plate bracket 12 with the screw 25, so the hole 23 does not need to be screwed. With this configuration, the heat generated in the winding 3 is radiated inside the hole 23, so that the heat radiation is excellent. In particular, since the hole diameter is larger outside the hole 23, the heat dissipation is particularly excellent. Further, it is possible to fix the motor to the device body or the steel plate bracket 12 to the stator 22 with short screws. Further, since there is no need to install an ear-shaped mounting portion for mounting the main body, the size of the motor can be reduced. Further, since the thickness of the resin in the slot portion is reduced, the curing time of the resin is reduced, and the productivity is improved.

As shown in FIG. 8, the screw holes 24 may be used to fix the steel plate bracket 12 to the stator 22.

In the present invention, the motor does not need to have a permanent magnet and may be an induction motor or the like. The same applies to the case where the steel plate bracket is on the output shaft side.
Further, the shapes of the grooves and holes are not limited to the above-described embodiments, and various modifications can be made according to the gist of the present invention.

[0031]

As is apparent from the above description, claim 1
According to the invention, the stator surface area is increased, heat dissipation is improved, and the mold layer between the bearing housing portion and the winding portion is thinned, so that mutual heat conduction is deteriorated,
The temperature of the bearing can be lowered and the service life can be extended.

According to the second aspect of the present invention, the heat generated in the stator is radiated inside the hole, so that the heat of the stator can be efficiently dissipated. It shortens time and improves productivity.

According to the third aspect of the present invention, the reduction in rigidity due to the provision of the hole by the wall can be reduced, so that the heat of the stator can be efficiently dissipated without lowering the function of suppressing vibration noise. In addition, by reducing the amount of resin, the resin curing time is shortened and the productivity is improved.

According to the fourth aspect of the present invention, since the hole passes through the inner part of the stator, heat can be efficiently radiated from a portion far from the surface where heat is easily stored.

According to the fifth aspect of the present invention, since there is no winding or the like near the end face of the stator, the heat radiation area can be increased by increasing the diameter of the hole and the amount of synthetic resin used can be reduced. It is.

According to the sixth aspect of the present invention, the steel plate bracket can be fixed to the stator by using the holes for heat dissipation, which has an advantage in terms of assembly in addition to the heat dissipation effect.

[Brief description of the drawings]

FIG. 1 is a perspective view of a molded motor according to a first embodiment of the present invention.

FIG. 2 is a sectional view of the molded motor.

FIG. 3 is a perspective view of a stator core winding product of a molded motor according to a second embodiment of the present invention.

FIG. 4 is a perspective view of the molded motor.

FIG. 5 is a perspective view of a molded motor according to a third embodiment of the present invention.

FIG. 6 is a perspective view of a molded motor according to a fourth embodiment of the present invention.

FIG. 7 is a sectional view of the molded motor.

FIG. 8 is a sectional view of a molded motor according to another example of Embodiment 4 of the present invention.

FIG. 9 is a perspective view of a conventional molded motor.

FIG. 10 is a sectional view of a conventional molded motor.

[Explanation of symbols]

 1, 17, 22 Stator 2 Stator iron core 3 Winding 4 Synthetic resin material 5 Bearing housing 6, 14 Bearing 7 Groove 8 Rotor 9 Permanent magnet 10 Rotor core 12 Steel plate bracket 13 Bearing bracket 16 Space 18, 20, 23 hole 19 Unevenness 21 Wall 24 Screw hole 25 Screw

Claims (6)

[Claims] 1. A stator core and a winding wound therearound are covered by a synthetic resin material so as to surround at least an inner peripheral surface of the stator core except for an inner peripheral surface thereof, and one end face has a radial center. A stator of a molded motor in which a bearing housing for accommodating a bearing at a position is integrally formed of the synthetic resin material, and has a groove in the vicinity of the bearing housing on the one end surface and on the inner diameter side with respect to the winding. A stator for a molded motor. 2. A stator of a molded motor in which a stator core and a winding wound therearound are integrally covered with a synthetic resin material so as to surround at least an inner peripheral surface of the stator core. A stator for a molded motor, characterized by having a hole penetrating in the axial direction at a position avoiding the wire and the stator core and having irregularities on a wall surface. 3. A stator for a molded motor in which a stator core and a winding wound therearound are integrally covered with a synthetic resin material so as to surround at least an inner peripheral surface of the stator core, the stator comprising a winding. A stator for a molded motor, wherein a hole penetrates in an axial direction at a position avoiding a wire and a stator core, and has an interior divided into a plurality of sections by walls. 4. The stator for a molded motor according to claim 2, wherein the position of the hole penetrating in the axial direction is located in a slot space remaining after the winding of the winding on the stator core. 5. The stator for a molded motor according to claim 2, wherein the hole penetrating in the axial direction has a larger diameter in the vicinity of the opening than in other portions. . 6. The stator according to claim 5, wherein a screw is inserted into a small diameter portion of the hole penetrating in the axial direction, and the steel plate bracket is fixed to the stator with the screw.