JP3445736B2 - Electric motor - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small electric motor used for ventilation of air conditioning equipment.

[0002]

2. Description of the Related Art Conventionally, as an example of this type of electric motor, the one shown in FIG. 5 has been known. The configuration will be described below with reference to the drawings.

As shown in the figure, the rotor 10 is provided at the center of the steel motor housings 103A and 103B which are divided into two in a shape covering the winding 102 wound around the stator 101.
Bearing part 1 in which the bearing 105 provided in 4 is inserted and held
06, the stator 101 is press-fitted and fixed to one motor housing 103A, the rotor 104 is inserted into the inner peripheral surface of the stator 101, the bearing 105 is fitted to the bearing portion 106 of the motor housing 103A, and the other is formed. The bearing 105 is fitted to the bearing portion 106 so that the motor housing 103B of the motor housing 103B is aligned with the motor housing 103A, and the motor housings 103A and 103B are screwed.
It was fixed by 7 and the nut 108 to form an electric motor.

[0004]

In the conventional construction of such an electric motor, the steel motor housing 103A,
103B is required, and after the stator 101 is press-fitted into the motor housing 103A, the other motor housing 1
Since 03B is fixed to the motor housing 103A with the screw 107 and the nut 108, there is a problem that the number of assembling steps is large.

After assembly, the motor housing 103
The internal state cannot be seen due to A and 103B, and during maintenance, it is necessary to release the fixing by the screw 107 and the nut 108 and disassemble, which is a problem that it takes time and labor.

The present invention solves the above problems, and an object of the present invention is to provide an electric motor which does not require a motor housing, reduces material costs, reduces the number of assembly steps, and facilitates maintenance. .

[0007]

In the electric motor of the present invention, a stator core laminated with slots between a plurality of teeth extending toward the center and the teeth of the teeth of the stator core. It is arranged in a stator formed by an insulator in which a winding receiver projecting in the axial direction is formed on a tooth portion in the vicinity of the circumferential side, and a winding wound around the tooth portion via the insulator. A pair of bearings that rotatably support the rotor and a bearing house that holds the bearings, and an engaging portion that fits the outer peripheral portion of the bearing house is provided on the inner periphery of the winding receiver. is there.

According to the present invention, it is possible to provide an electric motor that does not require a motor housing, reduces material costs, reduces the number of assembling steps, and facilitates maintenance.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is a stator core laminated with slots between a plurality of teeth extending toward the center, and the teeth of the stator core. Is disposed in a stator formed by an insulator having a winding receiver projecting in the axial direction on a tooth portion near the inner peripheral side of the portion, and a winding wound around the tooth portion via the insulator. A pair of bearings for rotatably supporting the rotor to be installed and a bearing house for holding the bearings are provided, and an engaging portion with which the outer peripheral portion of the bearing house fits is provided on the inner periphery of the winding receiver. In the configuration of the electric motor, the outer periphery of the bearing house that holds the bearing that rotatably supports the rotor is fitted and fixed to the engaging portion provided on the inner periphery of the winding receiver provided on the insulator. So beari Winding portion is exposed even when fitted with Guhausu, the maintenance is improved,
This eliminates the need for a steel motor housing, which has the effect of reducing material costs and improving assemblability.

The following is a description of the embodiments of the present invention with reference to FIGS.
This will be described with reference to FIG. (Embodiment 1) As shown in FIGS. 1 and 2, on a stator core 3 having slots 2 between a plurality of teeth 1 extending toward the center and being stacked, an outer peripheral side of the stator core 3 is provided. An insulator 6 having a winding receiver 5 protruding in the axial direction is integrally formed on the tooth portion 1 near the inner peripheral side of the tooth portion 1 and the tooth portion 1 formed on the tooth portion 1. The terminal pin 8 connected to the end of the winding wire 7 wound around is provided to form the stator 9.

Then, the rotor 1 disposed in the stator 9
A pair of bearings 11 for rotatably supporting 0 are provided on the rotor shaft 12, and a bowl-shaped bearing house 14 provided with a holding portion 13 of the bearing 11 is formed. Insulator 6 part 15
It is provided on the inner peripheral side of the winding receiver 5.

In the above structure, the stator 9 and the rotor 10 are arranged.
When assembling, the one bearing house 14 is fitted and fixed to the engaging portion 15 provided on the insulator 6, and the one bearing 11 provided on the rotor 10 is fitted and held by the holding portion 13 of the bearing house 14. , The other bearing house 14 with the thrust washer 16 inserted
Is fitted and fixed to the engaging portion 15 on the other side of the stator 9, and the rotor 10 is rotatably supported in the stator 9 by the bearing house 14 to form an electric motor.

As described above, according to the electric motor of the first embodiment of the present invention, the bearing house 14 holding the bearing 11 for rotatably supporting the rotor 10 is fitted to the engaging portion 15 provided on the insulator 6. Since it is fixed together, winding 7
Is exposed without being covered, and the heat dissipation effect is high,
By making the inside visible during maintenance, maintainability is improved, the need for a steel motor housing is eliminated, material costs are reduced, and screws and nuts are not used, and the number of assembly steps can be reduced.

Further, since the insulator 6 provided with the engaging portion 15 is integrally formed with the stator core 3, the assembly becomes easy.

(Second Embodiment) In the second embodiment, FIG.
As shown in FIG. 5, the engaging portion 15 of the insulator 6 is formed on a concentric circumference based on the inner peripheral surface 3a of the stator core 3.

In the above structure, the air gap between the rotor 10 and the stator 9 supported by the bearing 11 fitted and held in the holding portion 13 of the bearing house 14 fitted in the engaging portion 15A is made uniform. To be done.

As described above, according to the electric motor of the second embodiment of the present invention, the engaging portion 15 formed on the insulator 6 is formed.
Since A is formed on the concentric circumference with the inner peripheral surface 3a of the stator core 3 as a reference, the dimensional accuracy of the air gap between the stator 9 and the rotor 10 is improved, and the characteristics of the electric motor are improved.

(Embodiment 3) In Embodiment 3, FIG.
The bearing house 14 shown in is formed by resin.

In the above structure, by forming the electric motor using the bearing house 14 made of resin,
The noise generated from the bearing 11 held by the holding portion 13 of the bearing house 14 is reduced by the bearing house 14.

As described above, according to the electric motor of the third embodiment of the present invention, since the bearing house 14 for holding the bearing 11 for rotatably supporting the rotor 10 is made of resin, noise generated by the bearing 11 is generated. Etc. are alleviated by the bearing house 14, and the bearing noise can be attenuated.

(Embodiment 4) As shown in FIG. 3, one bearing house 14A is bonded and fixed to the engaging portion 15A of the insulator 6.

In the above structure, when assembling the electric motor, one bearing house 14A is fixedly adhered to the engaging portion 15A, so the rotor 10 is inserted into the stator 9 and the other bearing house 14 is inserted into the other. It can be easily fitted into the engaging portion 15 of.

As described above, according to the electric motor of the fourth embodiment of the present invention, one bearing house 14A is fitted to the engaging portion 15
Since it was fixedly bonded to A, the bearing house 14
Assembly is improved because B does not come off.

An example in which the electric motors of the first to fourth embodiments are incorporated in a ceiling-embedded ventilation fan will be described with reference to FIG.

As shown in the figure, a suction port 19 is provided inside a box-shaped main body 18 having a downward opening and a discharge port 17 on a side surface.
The electric motor 22 shown in FIG.
It is attached to the main body 18 via the to form a ceiling-embedded ventilation fan.

[0026]

As is apparent from the above embodiments, according to the present invention, a stator core laminated with slots between a plurality of teeth extending toward the center, and the stator core In a stator formed by an insulator having a winding receiver projecting in the axial direction on the tooth portion near the inner peripheral side of the tooth portion and a winding wound around the tooth portion via the insulator. A pair of bearings for rotatably supporting the rotor to be disposed and a bearing house for holding the bearings are provided, and an engaging portion with which an outer peripheral portion of the bearing house fits is provided with an inner periphery of the winding receiver. Since the motor is not required, the motor housing is not required, the material cost can be reduced, the number of assembling steps can be reduced, and the electric motor can be easily maintained.

Since the insulator provided with the engaging portion is integrally formed with the stator core, the number of assembling steps can be reduced.

Further, since the engaging portion of the insulator is formed on the basis of the inner peripheral surface of the stator core, the dimensional accuracy of the air gap between the stator and the rotor is improved.

Further, since the bearing house is made of resin, the bearing noise can be attenuated.

Further, since one bearing house is adhesively fixed to the engaging portion of the insulator, the assembling property is improved.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a configuration of an electric motor according to first to third embodiments of the present invention.

FIG. 2 is a perspective view showing an assembled state of the electric motor.

FIG. 3 is an exploded perspective view showing a configuration of an electric motor according to a fourth embodiment of the present invention.

FIG. 4 is a sectional view showing a state where the electric motor of the present invention is incorporated in a ceiling-embedded ventilation fan.

FIG. 5 is a partially cutaway side view showing the configuration of a conventional electric motor.

[Explanation of symbols]

1 tooth 2 slots 3 Stator core 3a Inner surface 5 winding receiver 6 insulators 7 windings 9 stator 10 rotor 11 bearings 14 Bearing house 14A bearing house 15 Engagement part 15A engagement part 22 Electric motor

Continuation of the front page (56) Reference JP-A-7-298540 (JP, A) Actually open 6-31376 (JP, U) Actually open 49-34903 (JP, U) Actually open 2-65059 (JP , U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H02K 3/32 H02K 5/173

Claims (5)

(57) [Claims] 1. A stator core laminated with slots between a plurality of teeth extending toward the center and an axial direction on the teeth of the stator core near the inner circumference of the teeth. A pair of bearings rotatably supporting a rotor provided in a stator formed by an insulator having a protruding winding receiver and a winding wound around the tooth portion via the insulator. And a bearing house that holds this bearing, and an electric motor in which an engaging portion with which the outer peripheral portion of the bearing house fits is provided on the inner periphery of the winding receiver. 2. The electric motor according to claim 1, wherein an insulator having an engaging portion is integrally formed with the stator core. 3. The electric motor according to claim 1, wherein the engagement portion of the insulator is formed with reference to the inner peripheral surface of the stator core. 4. The electric motor according to claim 1, wherein the bearing house is molded of resin. 5. The electric motor according to claim 1, wherein one bearing house is adhesively fixed to an engaging portion of the insulator.