JP2001016810A - Rotor for brushless motor and brushless motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress motor noise and improve the rotational efficiency of a motor by covering with end plate members the opening ends of through-holes formed by stacking holes provided in iron core plates. SOLUTION: A laminated iron core 31 of a rotor for a brushless motor is formed by a plurality of stacked, disk-shaped iron core plates 37 and iron core plates 43, 44, and an output shaft 30 is made to pass through in the center of the laminated iron core 31. Iron core plates 43, 44 having no circular opening are provided to seal a through-hole 42. By enclosing the through-hole 42 with the iron core plates 43, 44, air inside the through-hole 42 is prevented from being disturbed by a centrifugal force that occurs, when a rotor 15 is rotated. Consequently, the rotational noise of the rotor 15 can be suppressed. Also since the disturbance of air around the laminated iron core 31 can be reduced, air resistance which the rotor 14 receives when rotating can be decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotor for a brushless motor in which an opening end of a through hole formed in a laminated iron core is closed, and a brushless motor using the rotor.

[0002]

2. Description of the Related Art Conventionally, a rotor provided with magnets on a laminated core formed by laminating iron core plates, and a drive coil provided at a position facing the outer surface of the rotor and rotating the rotor. There is known a brushless motor that is roughly composed of a stator having a ridge formed therein, and this brushless motor has a structure in which rotation of a rotor is controlled by controlling power supply to a drive coil.

This brushless motor is, for example, shown in FIG.
A rotor 1 as shown in FIG. 6 is used. A through-hole 4 is formed in the laminated core.
The weight of the rotor 1 is reduced.

[0004]

However, when the rotor having the through-hole rotates, the air inside the through-hole is disturbed by centrifugal force, so that a vortex of air is generated. There is a problem in that rotational noise and rotational resistance to the rotor are generated, and as a result, motor noise of the brushless motor is generated and motor efficiency is reduced.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides a brushless motor rotor and a brushless motor using the rotor, which are capable of suppressing motor noise and improving motor rotation efficiency. The task is to provide.

[0006]

According to a first aspect of the present invention, there is provided a rotor for a brushless motor, comprising: a laminated core formed by laminating iron core plates having holes formed in a thickness direction thereof. And an opening end of the through hole formed by overlapping the holes is closed by an end plate member.

In the rotor for a brushless motor according to the first aspect of the present invention, since the open end of the through hole is closed, the rotation of the rotor for the brushless motor disturbs the air inside the through hole. This can be suppressed, and noise such as wind noise can be reduced.

Further, since the opening end of the through hole is closed, the turbulence of air generated around the rotor during rotation of the rotor for the brushless motor can be reduced, so that the air received by the rotor for the brushless motor can be reduced. The resistance can be reduced.

According to a second aspect of the present invention, in the rotor for a brushless motor, both the open ends of the through holes are closed by end plate members.

[0010] In the rotor for a brushless motor according to the second aspect of the present invention, the through-hole is completely sealed by closing both open ends of the through-hole.
Noise and air resistance can be reduced.

According to a third aspect of the present invention, in the rotor for a brushless motor, the end plate member is constituted by an iron core plate having no hole.

In the above-described rotor for a brushless motor according to the third aspect, since the end plate member is formed of an iron core plate, the structure is smaller than that in a case where a member other than the iron core plate is used to close the through hole. Can be simplified.

According to a fourth aspect of the present invention, in the rotor for a brushless motor, one surface of the end plate member is formed by a plane that covers an opening end of the through hole, and the other surface has a vertical cross-sectional contour shape when rotating. It is characterized by being formed by a smooth curve for guiding the wind passing in the laminating direction of the laminated core.

In the rotor for a brushless motor according to the fourth aspect of the invention, the profile of the longitudinal section of the end plate member is formed by a smooth curve for guiding the wind passing in the laminating direction of the laminated core during rotation. Therefore, even when air flows into the brushless motor as the brushless motor rotor rotates as in a blower, the turbulence of the airflow generated around the rotating rotor can be suppressed. Therefore, it is possible to reduce the air resistance of the brushless motor rotor.

[0015] A brushless motor according to a fifth aspect uses the brushless motor rotor according to any one of the first to fourth aspects.

In the brushless motor according to the fifth aspect, by using the brushless motor rotor according to any one of the first to fourth aspects, the brushless motor is generated around the brushless motor rotor. Motor noise can be reduced, and the driving efficiency of the motor can be improved.

[0017]

[First Embodiment] A first embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 shows an example of an electric blower 5 equipped with a brushless motor according to the present invention.

The electric blower 5 is roughly composed of a blower fan 6 and a drive motor 7. The blower fan unit 6 includes a fan case 8 and a rectifying plate 1 disposed in the fan case 8.
0, and a fan body 11.

The drive motor unit 7 includes a bottomed cylindrical motor case 12 and an end plate 14 for closing the opening of the motor case 12.
And a rotor 15 inside the motor case 12.
Brushless motor 17 schematically composed of a stator 16
Is installed.

The motor case 12 has a screw member 2
The end plate 14 is fixed to the current plate 10 by a screw member 21. Openings 22 and 23 for conducting outside air are formed in the bottom end portion and the end plate 14 of the motor case 12, and the outside air introduced by the rotation of the fan body 11 is supplied to the motor case 12 through the rectifying plate 10 and the opening 23. 1
2 to flow out of the motor case through the opening 22.

A bearing 27 having a bearing 25 is formed on the motor case 12, and a bearing 28 having a bearing 26 is formed on the end plate 14. These bearings 25, 26
, The output shaft 30 is rotatably supported.

The fan main body 11 is fixed to one end of the output shaft 30, and the rotation of the output shaft 30 causes the fan main body 11 to rotate.
Has a rotating structure.

The output shaft 30 is provided with a laminated core 31 which will be described later. The output shaft 30 forms the rotor 15 together with the laminated core 31.

The stator 16 is provided on the outer periphery of the laminated core 31 so as to face the outer surface of the laminated core 31. Stator 1
6, a drive coil 34 is provided.
By controlling the power supply to the motor 4, the rotation of the rotor 15 can be controlled.

In the vicinity of the stator 16, a Hall element 35 is provided.
It plays a role in preventing burnout by monitoring the heating status of the heating.

The laminated core 31 is composed of a plurality of disc-shaped iron core plates 37 and iron core plates 4 which are superposed as shown in FIGS.
The output shaft 30 extends through the center of the laminated core 31.

The iron core plate 37 is provided with four circular openings, and four through holes 42 are formed by overlapping the circular openings of the respective iron cores 37.

At both ends in the laminating direction of the laminated core plates 37, core plates 43, 44 having no circular opening are provided, and the through holes 4 are formed by the core plates 43, 44.
2 is sealed. The weight of the laminated core 31 is reduced by the through holes 42.

Four arc-shaped openings are provided in the vicinity of the outer peripheral edges of the iron core plates 37, 43, and 44.
An outer edge through-hole 39 is formed by superimposing 3, 44. The outer edge through hole 39 is filled with a resin magnet 40.

The rotor 15 used in the first embodiment as described above
In this configuration, since the iron core plates 43 and 44 seal the through hole 42, it is possible to prevent the air inside the through hole 42 from being disturbed by the centrifugal force when the rotor 15 rotates. Rotation noise can be reduced. Further, since the turbulence of the air around the laminated core 31 during rotation can be reduced, the air resistance that the rotor 15 receives during rotation can be reduced.

Further, by closing the through holes 42 using the iron core plates 43 and 44, the structure can be simplified as compared with the case where the through holes 42 are sealed using members other than the iron core plates.

In the brushless motor using such a rotor 15, the motor noise generated around the rotor 15 can be reduced, and the driving efficiency of the motor can be improved.

Second Embodiment FIG. 4 shows a rotor 50 according to a second embodiment.

The rotor 50 includes a laminated core 55 and an output shaft 30.
And closing members 51 and 52.

The laminated iron core 55 is formed by laminating disk-shaped iron core plates 37, and the resin magnet 40 is provided as in the first embodiment.

The laminated core 55 is provided with a through hole 42 formed by overlapping circular openings provided in the respective core plates 37, and the laminated core plates 37 are provided with through holes 42.
Among the end faces of the outermost layers, closing members 51 and 52 for closing the through holes 42 are provided.

The closing members 51 and 52 have a substantially conical shape whose outer surface is constituted by a continuous curved surface from the output shaft 30 to the outer surface of the laminated core 55.
The profile shape of the cross section along the output shaft 30 of 52 is formed by a smooth curve for guiding the wind passing in the laminating direction of the laminated core.

The bottom surfaces of the closing members 51 and 52 are formed as flat surfaces, and the through holes are sealed by the bottom surfaces.

The rotor 50 used in the second embodiment as described above.
In this case, the closing members 51 and 52 seal the through hole 42, so that the same effects as in the first embodiment can be obtained.

Further, since the closing members 51 and 52 are formed with smooth curves in the cross-sectional profile, the closing members 51 and 52 are inserted into the brushless motor with rotation of the brushless motor rotor like the blower shown in the first embodiment. Even in the case where air flows in, the air passing through the laminated core 55 in the laminating direction is guided to the outer surface of the laminated core 55 along the outer surfaces of the closing members 51 and 52, so that the periphery of the rotating rotor Therefore, it is possible to reduce the resistance of the rotor for the brushless motor due to the airflow.

Although the rotor for the brushless motor and the brushless motor using the rotor according to the present invention have been described with reference to the first and second embodiments, the present invention is not limited to the above-described structure. is not.

For example, in the first embodiment, the case where the brushless motor is used for the electric blower has been described, but if the rotor according to the present invention is used for the brushless motor, the brushless motor may be used for something other than the electric blower. May be the case.

[0044]

As described above, by using the brushless motor rotor according to the present invention, it is possible to reduce noise such as wind noise generated when the brushless motor rotor rotates, and to reduce the noise during rotation. It becomes possible to reduce the received air resistance.

Further, in a brushless motor using such a brushless rotor, it is possible to reduce motor noise generated around the brushless motor rotor and to improve the driving efficiency of the brushless motor.

[Brief description of the drawings]

FIG. 1 shows an electric blower using a brushless motor according to the present invention.

FIG. 2 is a perspective view of the rotor shown in the first embodiment.

FIG. 3 is a side sectional view of the rotor shown in the first embodiment.

FIG. 4 is a side sectional view of a rotor shown in a second embodiment.

FIG. 5 is a perspective view showing a conventional rotor.

FIG. 6 is a side sectional view showing a conventional rotor.

[Explanation of symbols]

 1, 15, 50 rotor (rotor for brushless motor) 4, 42 through-hole 17 brushless motor 30 output shaft 31, 55 laminated core 37 iron core plate 43, 44 iron core plate (end plate member) 51, 52 closing member (end) Plate member)

Claims (5)

[Claims] 1. A laminated iron core formed by laminating iron core plates having holes formed in a plate thickness direction, and an opening end of a through hole formed by overlapping the holes is closed by an end plate member. A rotor for a brushless motor, wherein the rotor is stripped. 2. The brushless motor rotor according to claim 1, wherein both open ends of said through holes are closed by end plate members. 3. The brushless motor rotor according to claim 1, wherein said end plate member is constituted by an iron core plate having no hole formed therein. 4. One surface of the end plate member is formed as a flat surface that closes an opening end of the through hole, and the other surface guides the wind passing through the laminated core in the laminating direction when the profile of the vertical cross section rotates. The brushless motor rotor according to claim 1 or 2, wherein the rotor is formed by a smooth curve. 5. A brushless motor using the brushless motor rotor according to any one of claims 1 to 4.