JP2004343876A - Motor and blower using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To offer a motor which can not deteriorate the efficiency of a blower such as a sirocco fan, a propeller fan, a turbo fan, etc. and can be used compactly. <P>SOLUTION: In a stator 14, a plurality of core pillars 20 project from a base 18 concentrically around a rotating shaft 22 and along the rotating shaft 22. A stator winding 38 is wound severally on each core pillar 20. In the rotating shaft 16, a discoid yoke 42 arranged above each core pillar 20 rotates around the rotating shaft 22, and a ring-shaped magnet is arranged at the downside of the yoke 42. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a motor and a blower such as a sirocco fan using the same.
[0002]
[Prior art]
Conventionally, a sirocco fan used for cooling electric devices and the like uses an inner rotor type motor and has a structure in which an impeller of the sirocco fan is attached to an output shaft of the motor. Then, there is a problem that the height of the impeller becomes large.
[0003]
Therefore, in order to reduce the height of the motor and the impeller, a configuration in which an outer rotor type motor is driven in an impeller has been conventionally proposed (Patent Documents 1 and 2). .
[0004]
The sirocco fan 100 having the conventional structure will be described with reference to FIG.
[0005]
The motor 102 of the sirocco fan 100 includes a stator 104 and an outer rotor type rotor 106.
[0006]
The stator 104 is formed by winding a stator winding around the upper and lower surfaces of a ring-shaped stator core 108, and the stator 104 is attached to a base 112.
[0007]
The rotor 106 has a rotating shaft 114 rotatably disposed at a center on the inner peripheral side of the stator 104 with respect to a base 112 via a pair of ball bearings 116 and 118.
[0008]
A cup-shaped yoke 120 is attached to the upper end of the rotating shaft 114, and a ring-shaped magnet 122 is provided on the inner peripheral side of the yoke 120 at a position facing the outer peripheral surface of the stator 104. Installed.
[0009]
On the opposite side of the base 112, a wiring board 124 containing a drive circuit for the motor 102 is arranged.
[0010]
An impeller 126 of the sirocco fan 100 is attached to an outer peripheral side of the yoke 120.
[0011]
[Patent Document 1]
JP-A-2002-238232
[0012]
[Patent Document 2]
JP-A-7-332290
[Problems to be solved by the invention]
In the sirocco fan 100 having the above-described configuration, the total size of the motor 102 and the impeller 126 is small, but as shown in the dimension of FIG. 9A, the size of the yoke 120 and the end face of the impeller 126 is small. However, there is a problem that the efficiency of the sirocco fan 100 is significantly reduced.
[0014]
In view of the above problems, the present invention provides a motor that can be used for compact without deteriorating the efficiency of a blower such as a sirocco fan, a propeller fan, and a turbofan, and a blower using the motor. It is.
[0015]
[Means for Solving the Problems]
The invention according to claim 1 is a motor having a stator and a rotor, in the stator, a plurality of iron core columns are arranged concentrically around a rotation axis from a base, and along the rotation axis. A stator winding is wound around each of the iron core columns, and the rotor has a disk-shaped yoke arranged at a distance from each of the iron core columns so as to be rotatable about the rotation axis. And a ring-shaped magnet plate in which S-pole and N-pole permanent magnets are alternately and concentrically arranged on the surface of the yoke opposed to the iron core column. is there.
[0016]
The invention according to claim 2 is the motor according to claim 1, wherein each of the iron core pillars is formed by laminating a steel plate on the base.
[0017]
The invention according to claim 3 is the motor according to claim 1, wherein the stator has the iron core pillar and the base integrally formed of a magnetically conductive material.
[0018]
According to a fourth aspect of the present invention, the magnetic conductive material is a sintered powder containing a magnetic material as the first material, a resin containing the magnetic material as the second material, and iron or iron as the third material. 2. The motor according to claim 1, wherein any one of forged materials containing iron as a main component is used.
[0019]
The invention according to claim 5 is the motor according to claim 1, wherein a wiring board having a drive circuit is disposed on a surface of the base opposite to a surface from which the iron core pillar projects. .
[0020]
The invention according to claim 6 is the motor according to claim 1, wherein the motor is a brushless DC motor.
[0021]
According to a seventh aspect of the present invention, there is provided a blower, wherein a blower impeller is attached to the yoke of the motor according to any one of the first to sixth aspects.
[0022]
The invention according to claim 8 is the blower according to claim 7, wherein the blower is a sirocco fan, a propeller fan, or a turbo fan.
[0023]
The invention according to claim 9 is the blower according to claim 8, wherein the blower is a sirocco fan, and an impeller of the sirocco fan is arranged to cover a stator of the motor.
[0024]
[Operation]
The motor according to claim 1 will be described.
[0025]
When electricity is passed through the stator windings of the stator, a magnetic field is generated for the magnets in the rotor, and the rotor rotates above the stator about the rotation axis.
[0026]
In this case, the thickness of the motor is the sum of the height of the base, the stator winding, the thickness of the magnet, and the thickness of the yoke, and the thickness can be reduced.
[0027]
In the motor according to the second aspect, the iron core pillar is formed by stacking steel plates on a base.
[0028]
In the motor according to the third aspect, the stator has the iron pole and the base integrally formed of a magnetically conductive material.
[0029]
According to the motor of the fourth aspect, the following three materials can be considered as materials for magnetic conductivity of the motor of the third aspect.
[0030]
The first material is a sintered powder, the second material is a resin containing a magnetic material, and the third material is iron or a forging material containing iron as a main component.
[0031]
In the motor according to the fifth aspect, since the wiring board having the drive circuit is arranged on the surface of the base opposite to the surface from which the iron core pillar projects, the thickness of the motor can be further reduced.
[0032]
In the motor according to the sixth aspect, the motor according to the first aspect is a brushless DC motor, and a driving current is supplied to a stator winding by an inverter circuit to rotate a rotor.
[0033]
According to the blower of the seventh aspect, by attaching the impeller to the motor according to any one of the first to sixth aspects, the blowing efficiency can be increased.
[0034]
The blower according to claim 8 can be applied to a sirocco fan, a propeller fan, or a turbo fan.
[0035]
According to the sirocco fan of the ninth aspect, since the impeller of the sirocco fan is arranged so as to cover the stator, the thickness can be further reduced.
[0036]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0037]
(1st Embodiment)
Hereinafter, a sirocco fan 10 according to a first embodiment of the present invention will be described with reference to FIGS.
[0038]
(1) Structure of Sirocco Fan 10 The structure of the motor 12 for rotating the sirocco fan 10 will be described.
[0039]
The motor 12 is a brushless DC motor, and includes a stator 14 and a rotor 16.
[0040]
In the stator 14, an iron core column 20 serving as a stator core projects on the upper surface of a metal disk-shaped base 18 along the direction of the rotation axis, and is arranged concentrically about the rotation axis. I have. That is, as shown in FIG. 3, three arc-shaped core pillars 20 protrude from the plane circular base 18 at predetermined intervals. The iron core column 20 is formed by laminating an arc-shaped steel plate on a metal base 18.
[0041]
A through-hole 24 through which the rotating shaft 22 of the rotor 16 penetrates passes through the center of the base 18, and a first ball bearing 26 is fixed to a lower surface side of the through-hole 24.
[0042]
An outer end of the base 18 has a flange 27 extending downward, and the base 18 has a dish shape. A wiring board 28 containing a drive circuit for driving the motor 10 is mounted on the lower surface side of the base 18, and a through hole 30 through which the rotating shaft 22 penetrates is provided at the center of the wiring board 28. Is penetrating. The height of the flange 27 is set to a size that can accommodate the wiring board 28. A disc-shaped lid 32 is covered on the lower surface side of the base 18 to house the wiring board 28. A recess 34 is provided in the center of the disc-shaped lid 32, and a second ball bearing 36 is attached to the recess 34. The rotating shaft 22 is rotatably supported on the base 18 by the first ball bearing 26 and the second ball bearing 36. Further, three fixed legs 40 protrude from the outer peripheral portion of the base 18 respectively.
[0043]
As shown in FIG. 3, a stator winding 38 is wound around each of the arc-shaped core pillars 20 which are stator cores. The stator winding 38 may be directly wound around the iron core column 20, or may be a structure in which the stator winding 38 is once wound around a bobbin or the like, and then the bobbin is attached to the iron core column 20. .
[0044]
The rotor 16 that rotates together with the rotation shaft 22 includes a yoke 42 and a magnet 44. The yoke 42 is cup-shaped, and the rotation shaft 22 is fixed to the center of the yoke 42, and a flange 46 projects from the outer end of the yoke 42.
[0045]
A ring-shaped magnet 44 shown in FIG. 4 is attached to the lower surface of the cup-shaped yoke 42, that is, the surface of the stator 14 facing the iron core column 20. The magnet 44 is provided with arc-shaped permanent magnets comprising S poles and N poles alternately, and four S poles and two N poles are alternately arranged.
[0046]
The impeller 48 of the sirocco fan 10 has a plurality of blades 50 mounted between a ring-shaped upper mounting plate 52 and a ring-shaped lower mounting plate 54.
[0047]
A flange 56 projects upward from the inner peripheral side of the ring-shaped lower mounting plate 54, and the flange 56 of the lower mounting plate 54 and the flange 46 of the yoke 42 are fixed. Thereby, the cup-shaped yoke 42 and the impeller 18 are in a state of covering a part of the stator 14 (the iron core pillar 20 and the stator winding 38).
[0048]
Since the motor 12 is a three-phase brushless DC motor, each stator winding 38 is connected to an inverter circuit, which turns on / off a switching element in the inverter circuit based on a PWM signal from the PWM circuit. By turning OFF, a driving current flows through the three-phase stator winding 38, and the rotor 16 rotates. When the rotor 16 rotates, the impeller 48 also rotates at the same time.
[0049]
(3) Effect of the structure of the sirocco fan 10 In the sirocco fan 10 having the above configuration, the total dimension B (see FIG. 1) of the motor 10 and the impeller 48 can be reduced. That is, the motor 10 is the sum of the thickness of the base 18 (that is, the height of the flange 27), the height of the iron pole 20, the thickness of the magnet 44, and the thickness of the yoke 42, and reduces the thickness. be able to. Therefore, the total size of the motor 10 and the impeller 48 can be reduced. Particularly, since the cup-shaped yoke 42 and the impeller 18 cover a part of the stator 14 (the iron core column 20 and the stator winding 38), the thickness can be further reduced.
[0050]
Further, since the thickness of the motor 10 can be reduced, the dimension C from the yoke 42 to the upper mounting plate 52 of the impeller 48 can be increased, so that the blowing efficiency can be improved as compared with the conventional case.
[0051]
(Second embodiment)
A second embodiment will be described with reference to FIG.
[0052]
In the stator 14 of the first embodiment, a steel plate is laminated on the upper surface of the base 18 and the iron core column 20 is attached. In the second embodiment, instead of this, as shown in FIG. The table 18 and the iron core column 20 are integrally formed of a magnetically conductive material.
[0053]
Specifically, the sintered powder including the magnetic powder is sintered to integrally mold the three iron core pillars 20 and the base 18.
[0054]
In addition, as the material of the magnetic conductivity, in addition to the sintered powder, a resin containing a magnetic material, or iron or a forged material containing iron as a main component may be used.
[0055]
(Third embodiment)
A third embodiment will be described with reference to FIG.
[0056]
In the motor 10 of the first embodiment and the second embodiment, the output shaft of the rotating shaft 22 is arranged on the upper surface side of the base 18, that is, on the side of the rotor 16, but instead of this, as shown in FIG. Alternatively, the output shaft may project from the lower surface of the base 18 opposite to the rotor 16.
[0057]
(Fourth embodiment)
A fourth embodiment will be described with reference to FIGS.
[0058]
In the motor 12 according to the first embodiment, the three iron core pillars 20 protrude from the base 18. Alternatively, as shown in FIG. 7, the six iron core pillars 20 project from the base 18. Thus, the three-pole motor 12 may be configured.
[0059]
In this case, as shown in FIG. 8, as the rotor 16, a ring-shaped magnet 44 in which four S poles and four N poles are alternately arranged is formed.
[0060]
(Example of change)
In the above embodiment, the motor 12 is used for the sirocco fan 10, but is not limited to this, and the motor 12 can be used for a blower such as a propeller fan or a turbo fan.
[0061]
【The invention's effect】
As described above, according to the motor of the present invention, the thickness can be reduced.
[0062]
Further, when this motor is used for a blower such as a sirocco fan, the size of the impeller can be increased because the motor is thin, so that the efficiency of the blower can be increased.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a motor and a sirocco fan according to a first embodiment of the present invention.
FIG. 2 is a plan view of the sirocco fan.
FIG. 3 is a plan view of the same stator.
FIG. 4 is a bottom view of the magnet.
FIG. 5 is a longitudinal sectional view of a motor and a sirocco fan according to a second embodiment.
FIG. 6 is a longitudinal sectional view of a motor according to a third embodiment.
FIG. 7 is a plan view of a stator according to a fourth embodiment.
FIG. 8 is a bottom view of a magnet according to a fourth embodiment.
FIG. 9 is a longitudinal sectional view of a conventional motor and a sirocco fan.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Sirocco fan 12 Motor 14 Stator 16 Rotor 18 Base 20 Iron pole 22 Rotating shaft 28 Wiring board 38 Stator winding 42 Yoke 44 Magnet 48 Impeller

Claims (9)

In a motor having a stator and a rotor,
The stator is
A plurality of iron core columns are arranged concentrically around the rotation axis from the base, and protrude along the rotation axis,
A stator winding is wound around each of the iron core columns,
The rotor,
A disc-shaped yoke arranged at an interval from each of the iron core columns is arranged rotatably around the rotation axis,
A motor, wherein a ring-shaped magnet plate in which S-pole and N-pole permanent magnets are alternately arranged concentrically is provided on a surface of the yoke facing the iron core column. The motor according to claim 1, wherein each of the iron core columns is formed by laminating a steel plate on the base. The motor according to claim 1, wherein the stator has the iron core pillar and the base integrally formed of a magnetically conductive material. The magnetically conductive material,
The first material is a sintered powder containing a magnetic material, the second material is a resin containing a magnetic material, and the third material is iron or a forged material containing iron as a main component. The motor according to claim 1, wherein two motors are used. 2. The motor according to claim 1, wherein a wiring board having a drive circuit is arranged on a surface of the base opposite to a surface from which the iron core pillar projects. 3. The motor according to claim 1, wherein the motor is a brushless DC motor. A blower, wherein a blower impeller is attached to a yoke of the motor according to any one of claims 1 to 6. The blower according to claim 7, wherein the blower is a sirocco fan, a propeller fan, or a turbo fan. The blower is a sirocco fan,
The blower according to claim 8, wherein the impeller of the sirocco fan is arranged so as to cover a stator of the motor.

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