JPH02254940A - Field magnet of outer-rotor electric rotating machine - Google Patents

Abstract

PURPOSE:To obtain a thin, ring magnet having a large outside diameter at low cost by arranging a plurality of magnet elements forming sections in a concentric circle to constitute a ring field magnet. CONSTITUTION:Eight sector magnets 9a1-9a8 are used and arranged in a ring to constitute a field magnet 9 to fulfill the same function as that of one ring magnet. In this case, a magnet element forming a sector is constituted to have one concentric circular arc, of which the inside and outside diameters are in parallel with each other, and both side faces, which are symmetric with respect to the central line and in parallel with each other. Thus, a thin magnet can be obtained practically and at very low cost so that it is possible to manufacture an outer rotor pulse motor having a large outside diameter.

Description

[Detailed Description of the Invention] [Industrial Field of Application] A ring-shaped field magnet used in a low-speed drive outer rotor motor or the like requires a larger magnet as the outer diameter of the motor increases.

However, currently due to limitations in the manufacturing method.

It is difficult to manufacture magnets that are thin and have a small difference between the inner and outer diameters, and a solution to this problem is being sought.

The present invention relates to a field magnet for an outer rotor rotating electrical machine that meets these demands.

[Prior Art] A conventional device was constructed as shown in FIG. The figure shows an example of an outer rotor type hybrid pulse motor.

The rotor 1 disposed on the inner side is constructed by press-fitting a laminated iron core 3 into a shaft 2 and winding a coil 4 around a slot in the iron core 3.

Although not shown, it is a pulse motor.

It is assumed that the cavity surface has guiding teeth.

On the other hand, the stator plate disposed on the outside is configured by arranging a ring-shaped field magnet 6, two sets of ring-shaped laminated iron cores 7a, 7b, and a casing 8 that sandwich the field magnet 6 from both sides. be done. Although not shown, guide teeth are of course also formed on the gap surfaces of the laminated cores 7a and 7b on the stator side.

As shown in the figure, the field magnet 6 is magnetized in the thickness direction, and the magnetic flux generated by the magnet is transferred to the laminated iron cores 7a and 7b on the stator side.
It reaches the motor cavity G1 through.

It reaches the laminated core 3 on the rotor 1 side through this gap G.

The magnetic flux that has entered the laminated core 3 travels through the core 3 in the axial direction and returns to the magnet 6 via the laminated core 7b arranged on the opposite side of the magnet 6 via the gap G2.

On the other hand, the coil 4 disposed above the first rotor is sequentially excited in a sequence according to the well-known principle of a pulse motor, and the field magnetic flux is switched to various types of inner.

In addition, as described above, induction teeth are provided on the gap surfaces between the iron cores 7a, 7b and the iron core 3, which are provided facing each other, and when magnetic flux passes through the opposing induction teeth, the magnetic resistance is minimized. Generate a torque to align the position.

In this way, by sequentially exciting the coils according to a predetermined sequence, magnetic flux can be switched to each magnetic pole and continuous torque can be obtained.

[Problems to be Solved by the Invention] By the way, in the case of the conventional configuration, if the outer diameter of the motor is up to about φ100, it is possible to manufacture a ring-shaped magnet, but for example, the outer diameter becomes large.

In the dimensions of the magnet.

When the size of the magnet is approximately 160 mm in outer diameter x 130 mm in inner diameter x 5 in thickness, it is very difficult to manufacture such a magnet, and if field magnets cannot be manufactured, motors cannot be manufactured either.

An object of the present invention is to provide a magnetic field magnet for an outer rotor rotating electrical machine that can practically obtain a thin ring-shaped magnet with a large outer diameter, which solves the above-mentioned problems (problems) of the conventional ones. shall be.

[Means for Solving the Problems] The present invention provides an outer rotor motor using permanent magnets, which includes a plurality of magnetic elements serving as sectors.

The present invention relates to a field magnet for an outer rotor rotating electrical machine that is arranged concentrically to form a ring-shaped field magnet.

In this case, the magnetic element serving as the sector has one concentric arc whose inner diameter and outer diameter are parallel.

It is also desirable that both side surfaces be symmetrical and parallel to the center line.

Furthermore, the magnetic element serving as the sector may have a concentric arc whose inner diameter and outer diameter are parallel, and both sides may be configured so that they are symmetrical with respect to the center line but are not parallel. .

Further, as a magnetic element serving as a sector, it has two or more concentric circular arcs with an inner diameter and an outer diameter parallel to each other, and both side surfaces are symmetrical with respect to the center line.

Alternatively, they may be configured to be parallel.

[Embodiment M] The present invention will be described below with reference to first to third embodiments shown in FIGS. 1(a) to 1(c). Note that in each figure, only the field magnet portion is extracted and shown, but the rest of the structure is the same as that in FIG. 2.

FIG. 1(A) shows a first embodiment. In this embodiment, eight sector-shaped magnets 9a, to 9as are arranged on a ring to constitute a field magnet 2, and have one function. The upper part can perform the same function as a single ring-shaped magnet. In this case, the magnetic element serving as the sector has one concentric circular arc whose inner diameter and outer diameter are parallel, and both side surfaces are symmetrical and parallel to the center line.

In this embodiment, 8 sectors are shown, but of course 8 sectors are used.
The number of sheets is not limited to 4 or 16, and can be set to a convenient number for manufacturing.

Furthermore, the shape of the magnet sector is also the same as in the first embodiment.

Although the shape is defined by arcs of the inner and outer diameters and lines on both sides parallel to the center line, various shapes can be taken as shown in other embodiments.

That is, as a second embodiment, as shown in FIG. 1(B), eight magnetic elements 10a to 10a forming sectors have concentric circular arcs whose inner diameter and outer diameter are parallel, In addition, both sides are formed symmetrically but not parallel to the center line to form the Retired Emperor Field Magnet.

Further, as a third embodiment, as shown in FIG. 1(C), the magnetic elements 11a to 11a serving as sectors have two or more concentric circular arcs whose inner diameter and outer diameter are parallel. ,
In addition, an example is shown in which one unit of field magnets is constructed by arranging the two side surfaces in a ring shape so that they are symmetrical and parallel to the center line.

[Operation] In each of the embodiments described above, eight sector-shaped magnetic elements are arranged concentrically, and their polarities are all arranged in the same direction.

Since both sides of each magnet are sandwiched between the laminated iron cores 7a and 7b, even if there is a gap between each sector, if the magnetic flux flows into the iron core, it becomes uniform, and compared to the case of a single ring-shaped magnet. Exactly the same magnetic flux distribution can be obtained.

Therefore, continuous rotational torque can be obtained by exciting the coil according to a predetermined sequence, similar to the conventional example shown in FIG.

[Effects of the Invention] The present invention provides an outer rotor motor using permanent magnets, which includes a plurality of magnetic elements serving as sectors.

Since the present invention relates to a field magnet for an outer rotor rotating electric machine in which a ring-shaped field magnet is formed by arranging concentric circles, it has an excellent first-order effect.

■If a magnetic element serving as a sector of the present invention is used.

A thin magnet with an outer diameter of φ150 or more, which has been difficult to manufacture in the past, can be practically obtained.

(2) Furthermore, since the field magnet produced by this method can be obtained at a very low cost, it is possible to manufacture an outer rotor pulse motor with a large outer diameter, which has been difficult to manufacture in the past.

[Brief explanation of drawings]

FIGS. 1(A) to 1(C) are side views showing only the field magnet portions showing first to third embodiments of the present invention, and FIG. 2 is a front view showing a conventional example. Figure 1 (a) 2.1 addition, 1 uni field magnet 9a + ~ 9a, magnet element 10a which becomes 2 sectors,
~10a,: n

Claims (1)

[Claims] 1. In an outer rotor motor using permanent magnets,
A field magnet for an outer rotor rotating electric machine, characterized in that a ring-shaped field magnet is constructed by arranging a plurality of magnetic elements serving as sectors on a concentric circle. 2. Claim 1, wherein the magnetic element serving as a sector has one concentric circular arc with an inner diameter and an outer diameter parallel to each other, and both side surfaces are symmetrical and parallel to the center line.
Field magnet of the outer rotor rotating electric machine described. 3. Claim 1, wherein the magnetic element serving as a sector has concentric circular arcs with an inner diameter and an outer diameter parallel to each other, and both side surfaces are symmetrical with respect to the center line but are not parallel to each other. Field magnet of the outer rotor rotating electric machine described. 4. As a magnetic element serving as a sector, it has two or more concentric circular arcs whose inner diameter and outer diameter are parallel, and both sides are configured so that they are symmetrical and parallel to the center line. A field magnet for an outer rotor rotating electric machine according to claim 1.