JP3777352B2 - Fan motor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fan motor used for cooling electronic components and the like.
[0002]
[Prior art]
Fan motors are used for cooling various small electric devices such as notebook computers, digital video cameras, and PDAs, and various proposals have been made (for example, Patent Documents 1 to 3). Among such fan motors, in particular, in a conventional axial fan motor, a plurality of blades that generate airflow are generally processed integrally on a back yoke on which a magnet is mounted. Hereinafter, the structure of the rotor of the conventional axial fan motor will be described with reference to FIG. 3A is a cross-sectional view showing the structure of a conventional rotor 100 to which the rotary blade 101 is attached, FIG. 3B is a plan view of FIG. 3A, and FIG. It is the figure which expand | deployed the blade | wing part 101b.
[0003]
The rotor 100 is made of a disk-shaped permanent magnet. The rotating blade 101 is obtained by processing a single metal plate, and includes a back yoke portion 101a to which the rotor 100 is fixed, and a blade portion 101b integrally connected to the periphery of the back yoke portion 101a. The shaft 102 is fitted into the hole 101c provided in the center portion. The blade portion 101b is formed by being twisted about 90 degrees with respect to the back yoke portion 101a from the state shown in FIG. 3 (c) and slightly bent along the broken line shown in FIG.
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 10-336953 [Patent Document 2]
Japanese Patent Laid-Open No. 11-8951 [Patent Document 3]
Japanese Patent Laid-Open No. 11-8962
[Problems to be solved by the invention]
However, in the conventional fan motor, since the blades are disposed on the outer periphery of the back yoke, the size of the blades is limited to a limited space between the magnet and the housing. Therefore, there is a limit to the increase in the size of the blades, a sufficient air volume cannot be obtained, and it is difficult to improve the air volume-static pressure characteristics, which is an important characteristic for a fan motor.
[0006]
Accordingly, an object of the present invention is to provide a fan motor capable of obtaining a larger air volume.
[0007]
[Means for Solving the Problems]
According to the present invention, in a fan motor including a rotor to which a rotating blade is attached and a stator that biases the rotor to a rotational force, the rotating blade is radially formed from a central portion of the rotating blade. A plurality of fixing portions for extending and fixing the rotating blades to the rotor, and integrally connected to a side portion of each of the fixing portions on the rotating direction side of the rotor and outward of the fixing portion extending to the fan motor, characterized in that it consists of a single metal plate having a plurality of blade portions which are formed radially from the center near the Rukoto is bent at the side of the fixed part Is provided.
[0008]
In the present invention, the rotor includes an annular permanent magnet and a back yoke attached to the upper surface of the permanent magnet, and the stator biases the rotor with a magnetic force. The rotating blades can be configured to be fixed to the upper surface of the back yoke.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional structural view of an axial flow type fan motor A according to an embodiment of the present invention. The fan motor A includes a rotor 10 and a stator 20 that biases the rotor 10 with a rotational force by a magnetic force.
[0010]
The rotor 10 includes an annular (disc-shaped) permanent magnet 11 and a back yoke 12 to which the permanent magnet 11 is fixed. A rotating blade 13 is attached to the back yoke 12, and the rotating blade 13 is fitted to the upper end portion of the shaft 14. Then, an air flow is generated in the axial direction of the shaft 14 by the rotation of the rotary blade 13 accompanying the rotation of the rotor 10.
[0011]
The stator 20 is an armature composed of a coil wound around the shaft 14, and is opposed to the permanent magnet 14 with a slight gap on a base 30 provided with a hole for preventing interference with the shaft 14 at the center. It is fixed at the position to be. The stator 20 generates a magnetic field when a current is applied, and the magnetic field acts on the permanent magnet 11, whereby a rotational force is applied to the rotor 10.
[0012]
A cylindrical support 31 is erected at the center of the base 30, and a bearing 32 that supports the shaft 14 is provided inside the support 31. With this configuration, the shaft 14 is rotatably supported, and the rotor 10 can freely rotate.
[0013]
Next, the attachment structure of the rotary blade 13 to the rotor 10 will be described with reference to FIGS. 1 and 2. 2A is a plan view of the rotor 10 to which the rotating blades 13 are attached, FIG. 2B is a plan view of the rotating blades 13, and FIG. 2C is a plan view of the back yoke 12. ) Is a developed view of the blade portion 13b of the rotary blade 13. FIG.
[0014]
The rotary vane 13 has a hole 13a ′ for fixing the rotary vane 13 to the back yoke 12, and is integrated with a plurality of fixed portions 13b extending radially from the center of the rotary vane 13 and the side portions of the respective fixed portions 13b. And a plurality of blade portions 13c that extend outward in the radial direction of the fixed portion 13b, and a convex portion 13d that protrudes at the center of the rotary blade 13, and is punched out from a single metal plate It was created through processes such as press working and bending. Further, as shown in FIG. 2D, a hole 13e is provided at the center of the rotary blade 13, and the upper end of the shaft 14 is fitted therein.
[0015]
The back yoke 12 has a function of strengthening the magnetic flux generated by the permanent magnet 11, and is made of, for example, iron and has a disk shape having a hole 12a in the center and a space in which the permanent magnet 11 is mounted on the lower surface inside. A plurality of annular protrusions 12b are provided on the upper surface. Then, the annular protrusion 12b is inserted into the hole 13a provided in the fixing portion 13b of the rotating blade 13, and the protrusion 12b is caulked as shown in FIG. 1, whereby the rotating blade 13 is fixed to the back yoke 12. .
[0016]
Here, in this embodiment, as shown in FIG.2 (d), the blade | wing part 13c of the rotary blade 13 is connected to the side part of the fixing | fixed part 13b, and the boundary (shown in FIG.2 (d), (A broken line directed substantially in the radial direction) and is bent approximately 90 degrees with respect to the fixed portion 13b. In this case, as shown in FIG. 1, in FIG. 2D, the portion located on the side of the fixed portion 13 b of the blade portion 13 c is disposed so as to face upward of the fixed portion 13 b, thereby generating an air flow. It constitutes a part of the blade.
[0017]
By configuring the blade portion 13c including the portion positioned above the back yoke 12 as described above, the size of the blade portion 13c is the same as that of the conventional case where the blade portion is disposed on the outer periphery of the back yoke. Even if it is a fan motor, the blade | wing part 13c can be enlarged. Furthermore, air near the center of the shaft 14 can be taken into the fan motor A, so that a larger air volume can be obtained and air volume-static pressure characteristics can be improved. Further, the rotating blade 13 is required to be thin. However, by forming the rotating blade 13 from a metal plate, the ease of processing and the strength can be improved as compared with the case of resin molding. Cost reduction.
[0018]
【The invention's effect】
As described above, according to the present invention, a fan motor capable of obtaining a larger air volume is provided.
[Brief description of the drawings]
FIG. 1 is a sectional view of an axial flow type fan motor A according to an embodiment of the present invention.
2A is a plan view of a rotor 10 to which a rotating blade 13 is attached, FIG. 2B is a plan view of the rotating blade 13, and FIG. 2C is a plan view of a back yoke 12. (D) is a developed view of the blade portion 13b of the rotary blade 13. FIG.
3A is a cross-sectional view showing a structure of a conventional rotor 100 to which a rotary blade 101 is attached, FIG. 3B is a plan view of FIG. 3A, and FIG. 3C is a rotary blade. FIG. 10 is a developed view of a blade portion 101b of 101;
[Explanation of symbols]
A Fan motor 10 Rotor 11 Permanent magnet 12 Back yoke 13 Rotating blade 13b Fixed portion 13c Blade portion 20 Stator

Claims (2)

In a fan motor comprising: a rotor to which a rotating blade is attached; and a stator for biasing the rotor with a rotational force.
The rotating blades extend radially from the central portion of the rotating blades, a plurality of fixing portions for fixing the rotating blades to the rotor, and each of the fixing portions on the rotation direction side of the rotor parts to extend outwardly of the stationary part is connected together, having a plurality of blade portions which are formed radially from the center near the Rukoto it is bent at the side of the fixed part A fan motor comprising a single metal plate. The rotor is
An annular permanent magnet;
A back yoke attached to the upper surface of the permanent magnet,
The stator urges the rotor to rotate by a magnetic force;
The fan motor according to claim 1, wherein the rotary blade is fixed to an upper surface of the back yoke.

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