JPH07231587A - Magnetic member for electric rotating machine - Google Patents

Abstract

PURPOSE:To enhance productivity of the magnetic member for a rotating machine by enhancing the workability when flat magnetic pieces are laminated to constitute a ties. CONSTITUTION:When a magnetic member 31 is manufactured, a yoke 31 and a ties 26 are constituted individually, and the ties 26 are secured to the yoke 31 while being arranged. Each ties 26 is formed by laminating a plurality of flat magnetic pieces 30. The flat magnetic pieces 30 are laminated in the direction substantially parallel with a plane intersecting the axis 100 of the yoke 31 perpendicularly. Since the dimensions of the flat magnetic piece 30 are increased, workability is enhanced when the ties 26 is manufactured by lamination.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to magnetic members such as stators and rotors that constitute rotating machines such as electric motors and generators.
Particularly, it relates to the structure of the yoke and the teeth.

[0002]

2. Description of the Related Art Rotating machines such as electric motors and generators are classified into an inner rotor type in which a rotor is arranged inside a stator and an outer rotor type in which a rotor is arranged outside a stator. Further, the rotor and the stator are usually formed by punching a magnetic material plate such as a silicon steel plate or an electromagnetic steel plate which has been surface-insulated with a press or the like, and laminating plate-like magnetic material pieces obtained by punching in a predetermined direction. FIG. 7 shows the structure of the magnetic member of the rotating machine according to the first conventional example. The magnetic member 10 shown in this figure has a structure used as, for example, a stator of an inner rotor type rotating machine, and is constituted by laminating a plurality of plate-shaped magnetic material pieces 12 in the axial direction shown by a chain line 100 in the figure. Has been done. Further, each plate-shaped magnetic material piece 12 has an annular yoke portion 1
2a and a predetermined number of teeth portions 12b radially arranged in the axis 100 direction inside the yoke portion 12a. Therefore, by laminating the plate-shaped magnetic material pieces 12, a predetermined number of teeth facing the rotor via the gap, and a yoke forming a magnetic circuit together with the teeth are formed. In order to form the plate-shaped magnetic material piece 12, it is necessary to prepare a press die having a complicated shape.

FIG. 8 shows the structure of the magnetic member 14 of the rotating machine according to the second conventional example. This magnetic member 14
For example, it is used as a stator of an outer rotor type rotating machine. The magnetic member 14 has a structure in which a plurality of plate-shaped magnetic material pieces 16 punched by a press or the like are laminated along the axis 100 direction, like the plate-shaped magnetic material piece 12 in the first conventional example. Each plate-shaped magnetic material piece 16 has an annular yoke portion 16a and a shaft 100 on the outside of the yoke portion 16a.
It is composed of a plurality of teeth portions 16b radially arranged as viewed from above. Therefore, also in this conventional example, it is necessary to perform pressing with a mold having a complicated shape.

A problem common to these first and second conventional examples is that, as described above, a complicated shape must be punched out by a press die, and therefore the outer diameter of the rotating machine and the air gap between the rotor and the stator must be eliminated. There is a point that a new expensive press die must be recreated when a design change or the like occurs. In addition to this, the first conventional example has a problem that it is difficult to wind the winding wire around the tooth portion 12b.
In the second conventional example, since the teeth portions 16b extend radially outside the yoke portion 16a, the workability of winding the winding is better than that in the first conventional example. However, also in the second conventional example, for example, when each tooth portion 12b is covered with insulating paper or the like and the winding is wound thereon, the winding time per turn becomes long, so that ) × (number of turns) × (number of teeth portions 16b) increases the winding time. Further, in the second conventional example, it is possible to wind a winding wire around a bobbin formed of an insulating material such as FRP, and then insert the bobbin into the teeth portion 16b and mount it.
Even in this case, a certain degree of strength (thickness) is required for the bobbin in order to prevent deformation of the bobbin due to winding and ensure proper insertion and mounting. And the number of turns will be reduced. In addition, in the second conventional example, since the teeth portions 16b are arranged radially outside the yoke portion 16a, when the plate-shaped magnetic material pieces 16 are punched from a magnetic material plate such as a silicon steel plate, the yield of the silicon steel plate is increased. Another problem is that it is difficult to improve.

FIG. 9 shows a magnetic member 18 according to a third conventional example.
The configuration of is shown. The configuration shown in this figure is
Like the conventional example, it can be used as a stator of an inner rotor type rotating machine, for example, Japanese Patent Publication No. 57-12378.
It is disclosed in the publication.

In manufacturing the magnetic member 18, first, a plate-like magnetic material piece 20 having an annular shape similar to the yoke portion 12a in the first conventional example is punched from a magnetic material plate such as a silicon steel plate by a press or the like. At the same time, the teeth portion 12 in the first conventional example is also made of a magnetic material plate such as a silicon steel plate.
The plate-shaped magnetic material piece 22 having the same shape as b is punched by a press or the like. The plate-shaped magnetic material piece 2 thus obtained
0 and 22 are laminated in a predetermined number, and the laminated body of the plate-shaped magnetic material pieces 22 is placed inside the plate-shaped magnetic material piece 20 to form the shaft 100.
They are aligned and fixed so that they are radial with respect to each other and the laminating direction of the plate-shaped magnetic material pieces 22 is parallel to the axis 100. In this way, the laminated body of the plate-shaped magnetic material pieces 20 constitutes the yoke 24, and the laminated body of the plate-shaped magnetic material pieces 22 constitutes the teeth 26. With such a configuration, it is only necessary to use a press die having a simple shape as compared with the first and second conventional examples, and the manufacturing cost and the development cost can be reduced. Further, since the work of winding the winding wire around the tooth 26 can be performed before the laminated body of the plate-shaped magnetic material pieces 22 is attached to the laminated body of the plate-shaped magnetic material pieces 20, the winding operation is performed. The workability involved is also improved. At that time, if the bobbin is mounted on the laminated body of the plate-shaped magnetic material pieces 22 and then the winding is wound, it is not necessary to consider the deformation of the bobbin and the bobbin can be thinned. Also, the number of turns can be increased. In addition, the yield at the time of punching the plate-shaped magnetic material pieces 20 and 22 from a magnetic material plate such as a silicon steel plate by pressing is improved.

[0007]

However, even when the yoke and the teeth are formed as a laminated body of separate plate-like magnetic material pieces as in the third conventional example, the plate-like magnetic material forming the teeth portion is particularly important. Since the size of the body piece is small, it is difficult to stack the pieces, which hinders the improvement of productivity. In particular, this problem becomes remarkable in a rotating machine having many teeth.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and in the rotating machine, the plate-like magnetic material pieces forming the teeth in a laminated form have a larger shape. The purpose is to further improve the productivity of magnetic members.

[0009]

In order to achieve such an object, in the magnetic member of the rotating machine according to the present invention, the teeth form a plurality of plate-shaped magnetic material pieces in the circumferential direction with respect to the central axis of the yoke. It is characterized by being integrally laminated.

Further, the magnetic member according to the present invention is characterized in that the plate-shaped magnetic material piece forming the tooth is a plate-shaped magnetic material piece formed by cutting the plate-shaped magnetic material.

[0011]

In the present invention, the teeth formed by stacking the plate-shaped magnetic bodies are aligned and fixed on the surface of the yoke such that the stacking direction of the plate-shaped magnetic body pieces is the circumferential direction.
Therefore, the size of each plate-shaped magnetic material piece constituting the tooth becomes larger and the number of sheets can be reduced as compared with the case where the laminating direction of the plate-shaped magnetic material piece is made substantially parallel to the axis of the yoke.

Further, according to the present invention, the plate-shaped magnetic material piece forming the tooth is formed by cutting a plate-shaped magnetic material, for example, a magnetic material plate such as a silicon steel plate. That is, punching with a press or the like is not necessary, so that the yield of the plate-shaped magnetic body used is improved.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings. The same components as those in the conventional example shown in FIGS. 7 to 9 are designated by the same reference numerals and the description thereof will be omitted.

FIG. 1 shows the structure of a magnetic member 28 according to the first embodiment of the present invention. The magnetic member 28 shown in this figure has a configuration that can be used as a stator of an inner rotor type rotating machine as in the first and third conventional examples. Similar to the third conventional example, the magnetic member 28 has an annular yoke 24 that is individually laminated and formed, and teeth 26 that are aligned and fixed inside the yoke 24. The teeth 26 are arranged along a direction parallel to the axis 100 of the yoke 24, and are arranged inside the yoke 24 at intervals so as to be radial when viewed from the axis 100.

A feature of this embodiment is that the tooth 26 is composed of a plurality of plate-shaped magnetic material pieces 30 laminated along a direction parallel to a plane orthogonal to the axis 100. Since the length of the tooth 26 to be formed in the direction of the axis 100 is smaller than the thickness in the direction orthogonal thereto, the plate-shaped magnetic piece 30 in this embodiment is larger than the plate-shaped magnetic piece 22 in the third conventional example. Becomes Therefore,
The work of stacking the plate-shaped magnetic material pieces 30 to form the teeth 26 has better workability than that in the third conventional example.

FIG. 2 shows the structure of the magnetic member 32 according to the second embodiment of the present invention. The magnetic member 32 shown in this figure can be used as a stator of an outer rotor type rotary machine as in the second conventional example, and has a structure in which a predetermined number of teeth 26 are aligned and fixed to the outside of the yoke 31. The extending direction of the teeth 26 is a direction parallel to the shaft 100, and the teeth 26 are radially arranged at intervals when viewed from the shaft 100.

The characteristics of this embodiment are similar to those of the first embodiment.
Each of the teeth 26 is formed by stacking the plate-shaped magnetic material pieces 30, and thereby the workability in stacking the teeth 26 is improved.

FIG. 3 shows a manufacturing process of the tooth 26.

As shown in FIG. 3A, in manufacturing the tooth 26 according to the first or second embodiment,
First, a plurality of plate-shaped magnetic material pieces 30 are formed by cutting or pressing from a magnetic material plate such as a silicon steel plate. When the plate-shaped magnetic material piece 30 is formed by cutting, the yield of the magnetic material plate such as a silicon steel plate is improved as compared with when using a press. This is because it is not possible to use the entire surface of the silicon steel plate or the like used when punching the plate-shaped magnetic material piece 30 by pressing,
In the case of cutting, it depends on what can be used.

Next, as shown in FIG. 3B, a predetermined number of plate-shaped magnetic material pieces 30 obtained by cutting or pressing are laminated and integrated by welding or the like. Thereby, the teeth 26 are formed.

As shown in FIG. 3 (c), the teeth 26 thus formed are provided with bobbins or insulating paper 3 as shown in FIG.
4 is mounted, and the winding 36 is wound via the bobbin or the insulating paper 34. When winding the winding 36, as shown in FIG. 3D, the entire tooth 26 is rotated around the axis indicated by the alternate long and short dash line 200. In this way, the winding 36 can be wound very easily.

Further, when a bobbin is used as the member 34, since the bobbin 34 is attached to the tooth 26 prior to the winding of the winding wire 36, the distortion of the bobbin 34 due to the winding of the winding wire 36 is taken into consideration. Bobbin 34
Can be made thinner than before. As a result, the number of turns of the winding 36 can be increased or ensured.

The teeth 26 thus obtained are
It is aligned and fixed to a yoke 31 having a shape as shown in FIG. Therefore, the yoke 31 has grooves 3 on its outer surface.
1a. The teeth 26 are aligned and fixed by press fitting or fitting with the grooves 31a. At that time, it is preferable to perform welding or resin molding. As shown in FIG. 5, the magnetic member 32 obtained through these steps is incorporated inside a rotor 40 in which a predetermined number of permanent magnets 38 are arranged inside, so that an outer rotor type rotating machine is obtained. 42 can be obtained.

As described above, according to this embodiment, the teeth 26 are formed by stacking the plate-shaped magnetic material pieces 30 in a direction substantially parallel to the plane orthogonal to the axis 100. The size of the plate-shaped magnetic material piece 30 to be formed is increased, and therefore the workability relating to lamination is improved. Further, since the plate-shaped magnetic piece 30 can be manufactured by cutting, the yield of the magnetic plate, which is a material of the plate-shaped magnetic piece 30, for example, a silicon steel plate is improved, and the manufacturing cost is reduced. This effect becomes more remarkable as the number of teeth 26 increases.

In addition, the teeth 26 are connected to the yoke 24 or 3
Since it is configured separately from 1, the winding 36 can be wound while rotating the teeth 26, as shown in FIG. 3D, and the number of winding winding steps can be reduced. Further, since it is not necessary to consider the deformation of the bobbin 34, the wall thickness can be reduced. It is also easy to deal with design changes.

Further, even if the laminating direction of the plate-shaped magnetic members 30 constituting the teeth 26 is different from that of the third conventional example as in these embodiments, no problem occurs in the characteristics of the rotating machine 42. In particular, the eddy current generated at the end surface of the plate-shaped magnetic body piece 30 due to the passage of the magnetic flux through the contact surface between the yoke 24 and the teeth 26 hardly changes. This is because the scale of the eddy current generated is determined by the thickness of the plate-shaped magnetic body piece 30.

In addition, in each of the embodiments described above, the plate-like magnetic material piece constituting the tooth 26 and the yoke 24 are provided.
It is possible to form it from a material different from the plate-shaped magnetic body piece 20 constituting the. That is, it is possible to use a generally expensive material for the teeth 26 in which the magnetic flux is more likely to be concentrated than in the yoke 24, so that magnetic saturation can be avoided.

FIG. 6 shows an example of the structure of the magnetic member of the rotating machine according to the third embodiment of the present invention, particularly another structure of the teeth 26 thereof. In the tooth 26 shown in this figure, plate-shaped members 44 whose upper portions are bent in an L-shape are fixed to the left and right sides of the laminated body of the plate-shaped magnetic material pieces 30 by, for example, welding. The bent portion of the upper portion of the member 44 functions as a collar of the tooth 26. By using the teeth 26 having such a collar, it is possible to deal with the case where the magnet used in the opposing magnetic member (the rotor when the teeth 26 are used as the teeth of the stator) is not strong.

[0029]

As described above, according to the present invention,
Since the lamination direction of the plate-shaped magnetic members forming the teeth is set to be substantially parallel to the plane orthogonal to the axis of the yoke, the size of the plate-shaped magnetic material pieces forming the teeth can be increased. The workability of assembling is improved. In addition, according to the present invention, the plate-shaped magnetic body is cut to form the plate-shaped magnetic body pieces that form the teeth. Therefore, as compared with the case where punching is performed by, for example, a press, an expensive press metal is used. Since a mold is not required, the cost can be significantly reduced. In addition, the yield of the plate-shaped magnetic body used (for example, silicon steel plate) is improved, the plate-shaped magnetic body is not wasted, and a structure with a good material cost can be obtained. .

[Brief description of drawings]

FIG. 1 is a perspective view showing a configuration of a magnetic member according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a configuration of a magnetic member according to a second embodiment of the present invention.

FIG. 3 is a view showing a manufacturing process of teeth, in particular, (a) shows a step of forming a plate-shaped magnetic material piece by cutting or pressing, and (b) shows a step of laminating a plate-shaped magnetic material piece by welding or the like.
(C) is a diagram showing a bobbin or insulating paper mounting process, and (d) is a winding winding process.

FIG. 4 is a plan view showing the shape of a yoke used in a second embodiment.

FIG. 5 is a cross-sectional view taken along the axis orthogonal direction showing the configuration of a rotating machine when the magnetic member according to the second embodiment is used as a stator of an outer rotor type rotating machine.

FIG. 6 is a perspective view showing a shape of a tooth in a magnetic member according to a third embodiment of the present invention.

FIG. 7 is a perspective view showing a configuration of a magnetic member according to a first conventional example.

FIG. 8 is a perspective view showing a configuration of a magnetic member according to a second conventional example.

FIG. 9 is a perspective view showing a configuration of a magnetic member according to a third conventional example.

[Explanation of symbols]

 24, 31 Yoke 26 Teeth 28, 32 Magnetic Member 30 Plate-shaped Magnetic Material Pieces 34 Comprising Teeth 34 Bobbin or Insulating Paper 36 Winding 42 Rotating Machine

Claims (2)

[Claims] 1. A rotary machine comprising: a cylindrical yoke made of a magnetic material; and a tooth that is separately formed from the yoke and is fixed to an outer peripheral surface or an inner peripheral surface of the yoke so as to project radially. A magnetic member for a rotating machine, wherein the teeth are formed by integrally laminating a plurality of plate-shaped magnetic material pieces in a circumferential direction with respect to a central axis of the yoke. 2. The magnetic member according to claim 1, wherein the plate-shaped magnetic material piece forming the tooth is a plate-shaped magnetic material piece formed by cutting the plate-shaped magnetic material. .