JP2005045890A - Rotating machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve a performance realize and to realize a low cost in a rotating machine having an outer rotor type rotor. <P>SOLUTION: The rotating machine 1 includes a rotary shaft 2, a claw pole type stator 4 mounted on an outer periphery of the rotary shaft 2 via a bearing 3, and the outer rotor type rotor 6 having a magnet 5 opposed to an outer peripheral surface of the stator 4 and rotating together with the rotary shaft 1. The stator core 8 of the stator 4 is made of a dust molded product. The number of components can be reduced by adopting the claw pole type stator 4. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotating machine including an outer rotor type rotor.
[0002]
[Prior art]
As a conventional rotating machine, for example, there is one as shown in FIG. The rotating machine shown in FIG. 4A is used as a propeller fan motor, and is opposed to a rotating shaft 101, a stator 103 attached to the rotating shaft 101 via a bearing 102, and an outer peripheral surface of the stator. And an end bracket 106 arranged on one end side (right side in the figure) of the rotating shaft 101, and the rotating machine is held by the end bracket 106 at a fixed portion (not shown). Is possible.
[0003]
The stator core 107 constituting the stator 103 is formed by laminating a large number of steel plates. As shown in FIG. 4B, a plurality of salient poles 107b are provided at regular intervals on the outer periphery of the annular portion 107a. A coil 109 is wound around each salient pole 107b via an insulator 108. The stator 103 is press-fitted into a ring-shaped bracket 110 integrally having a bearing housing, and is connected to an end bracket 106 with a bearing 102 interposed between the bracket 110 and the rotating shaft 101.
[0004]
The rotor 105 has a shallow bottomed cylindrical shape, a fan 111 is provided on the outer side, a plurality of magnets 104 are provided on the inner peripheral surface at regular intervals, and a central portion is connected to the rotary shaft 101. It rotates with the rotation shaft 101.
[0005]
[Problems to be solved by the invention]
By the way, the rotating machines as described above are used in various electric machines including household electric appliances in addition to propeller fan motors. In order to make these electric machines more excellent, performance is improved and costs are reduced. Is required.
[0006]
OBJECT OF THE INVENTION
The present invention has been made in view of the above-described conventional situation, and an object thereof is to realize improvement in performance and cost reduction in a rotating machine including an outer rotor type rotor.
[0007]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided a rotating machine including a rotating shaft, a claw pole type stator mounted on the outer periphery of the rotating shaft via a bearing, and a magnet facing the outer peripheral surface of the stator. A rotating outer rotor type rotor is provided, and the stator core of the stator is formed of a compacted body, and as claimed in claim 2, the stator stator core is integrally formed with a bearing holding portion interposed between the stator shaft and the rotating shaft. According to a third aspect of the present invention, the rotor magnet is a ring-shaped magnet having internal polar anisotropy, and the above configuration is used as a means for solving the conventional problems.
[0008]
【The invention's effect】
According to the rotating machine of the first aspect of the present invention, since the claw pole type stator is adopted in the rotating machine including the outer rotor type rotor, the coil to be wound becomes one and a plurality of salient poles Compared to the case using a stator core having the above, it is possible to reduce the number of parts, reduce the weight, improve the productivity, and reduce the cost, and easily increase the number of slots. Further, according to the rotating machine, by adopting the stator core made of the compacted body, high molding accuracy of the stator core can be obtained, so that the assembly accuracy can be improved.
[0009]
According to the rotating machine of the second aspect of the present invention, the same effect as that of the first aspect can be obtained, and the bearing holding portion is integrally provided on the stator core of the stator, thereby further increasing the number of parts. Reduction can be realized, and it can contribute further by reducing weight, improving productivity, and reducing costs.
[0010]
According to the rotating machine of the third aspect of the present invention, the same effect as in the first and second aspects can be obtained, and further, by using a ring-shaped magnet having internal polar anisotropy for the rotor, The assembly can be improved, and the back yoke can be made thinner or yokeless, and further weight reduction and cost reduction can be realized.
[0011]
【Example】
A rotating machine 1 shown in FIG. 1 (a) is used as a propeller fan motor, and includes a rotating shaft 2, a claw pole type stator 4 attached to the outer periphery of the rotating shaft 2 via a bearing 3, A magnet 5 facing the outer peripheral surface of the stator 4 is provided, and an outer rotor type rotor 6 that rotates together with the rotary shaft 1 is provided, and an end bracket 7 disposed on one end side (right side in the figure) of the rotary shaft 2 is provided. Thus, the rotating machine can be held by the end bracket 7 at a fixed portion (not shown).
[0012]
The stator core 8 constituting the stator 4 includes a pair of segments 9 and 9 as shown in FIGS. Each segment 9 has claw-like salient poles 9a projecting in the axial direction on one side thereof at regular intervals in the circumferential direction, and a boss 9b in the center, at the end on the inner circumference side of the boss 9b. Corresponding to the bearing 3 interposed between the rotary shaft 2 and the stepped holding portion 9c is integrally provided.
[0013]
The segments 9 are assembled so that the counterpart salient pole 9a enters between the adjacent salient poles 9a with an appropriate gap, and the insulators are formed on the outer circumferences of both bosses 9b that are coaxially continuous. A coil 11 is wound through 10. Note that the coil 11 is wound around the insulator 10 in advance, and is incorporated at the same time as the assembly of both the segments 9.
[0014]
The stator 4 holds the bearing 3 interposed between the stator 4 and the rotary shaft 2 by a holding portion 9 c and connects the stator core 8 to the end bracket 7. Here, both segments 9 of the stator core 8 are made of a compacted body. That is, the segment 9 is obtained by, for example, using a powder material obtained by coating pure iron powder with an inorganic material or an insulating resin, pressing the powder material into a predetermined shape with a mold, and then firing the powder material.
[0015]
The rotor 6 has a shallow bottomed cylindrical shape, and a ring-shaped magnet 5 having multipolar inner surface polar anisotropy is provided on the inner peripheral surface, and the central portion is connected to the rotating shaft 2. Yes. The rotor 6 includes a fan 12 on the outer periphery, and rotates together with the rotating shaft 2 when the rotating machine is in operation. Further, the magnet 5 having the inner pole anisotropy is a magnet formed by a magnetic field by a conventionally known method, and the N pole and the S pole are alternately continued in the circumferential direction, as shown in FIG. A magnetic field is generated only on the inner peripheral side.
[0016]
In the rotating machine 1 having the above-described configuration, since the claw pole type stator 4 is employed, the number of parts is obviously smaller than that using a stator core having a plurality of salient poles (see FIG. 4). As a result, weight reduction, productivity improvement and cost reduction can be realized. Also, when increasing the number of slots, it is not necessary to increase the number of coils, which is easy to realize.
[0017]
Furthermore, in the rotating machine 1, since the stator core 8 is formed of a compacted body, the molding accuracy of the stator core is also high. In addition to this, the holding portion 9 of the bearing 3 is integrally molded with the stator core 8, It is possible to reduce the number of parts and improve the assembly accuracy.
[0018]
Further, in the rotating machine 1, the rotor 6 uses a ring-shaped magnet 5 having inner surface polar anisotropy, and this magnet 5 generates a magnetic field only inside as shown in FIG. The side back yoke (yoke 110 in FIG. 4) is not required, or the back yoke can be thinned, and this can also realize further weight reduction and cost reduction.
[0019]
The rotating machine of the present invention is exemplified by the propeller fan motor in the above embodiment, but can also be applied to a sirocco fan, a turbo fan motor, and other electric drive sources, and a detailed configuration. However, the present invention is not limited only to the above embodiment.
[Brief description of the drawings]
FIG. 1 is a sectional view (a) with one side omitted and a front view (b) of a stator for explaining an embodiment of a rotating machine of the present invention.
FIG. 2 is a perspective view illustrating a stator.
FIG. 3 is an explanatory diagram showing a magnetic field of a magnet having inner polar anisotropy.
FIG. 4 is a cross-sectional view (a) with one side omitted illustrating a conventional rotating machine and a front view (b) of a stator.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rotating machine 2 Rotating shaft 3 Bearing 4 Stator 5 Magnet 6 Rotor 8 Stator core 9c Holding part

Claims (3)

The stator includes a rotating shaft, a claw pole type stator mounted on the outer periphery of the rotating shaft via a bearing, and an outer rotor type rotor provided with a magnet facing the outer peripheral surface of the stator and rotating together with the rotating shaft. The stator core of the present invention comprises a compacted body. The rotating machine according to claim 1, wherein the stator core of the stator is integrally provided with a bearing holding portion interposed between the stator core and the rotating shaft. The rotating machine according to claim 1 or 2, wherein the magnet of the rotor is a ring-shaped magnet having inner polar anisotropy.

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