JPH0530141B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a permanent magnet type rotating electric machine used in a generator or electric motor that uses high-energy magnets.

[Conventional technology]

As shown in Fig. 1, the conventional type has a magnetized core 4.
A magnetizing coil 5 for passing a magnetic flux 9 is wound around the magnetizing coil 5, and a magnetizing power source 6 is connected to the magnetizing coil 5 via a switch 7, thereby forming a magnetizing device. On the other hand, two arc-shaped magnets 1, 1 are fixed to the inner circumference of the yoke 2, and a motor 8 is constructed by inserting an armature 3 with an armature winding 3a wound between these magnets 1, 1. has been done.

After this motor 8 is inserted into the magnetizing core 4, current is supplied from the magnetizing power supply 6 to the magnetizing coil 5 via the switch 7, thereby magnetizing the magnets 1,1.

However, in the above-mentioned conventional devices, in order to improve the output of the rotating electric machine, a high-energy magnet that is small, lightweight, and can generate a strong magnetic force is used instead of, for example, a ferrite magnet that has been conventionally used as the magnets 1, 1. When using a yoke 2 having a small thickness as shown in FIG. 1, magnetic saturation of the magnetic flux path occurs when the yoke 2 shown in FIG. 1 is operated as a motor because the magnetic force of the high-energy magnet is strong. That is, the first
When the illustrated motor 8 operates, the magnetic flux generated by the magnets 1, 1 flows through the armature 3 and the yoke 2. To describe the flow of this magnetic flux more specifically,
In FIG. 1, the upper and lower magnets 1, 1 are magnetized by the north and south poles of the magnetized core 4, with their upper surfaces magnetized to the south pole and their lower surfaces magnetized to the north pole, so that
The magnetic flux emitted from the upper magnet 1 in FIG. 1 returns to the upper magnet 1 via the armature 3 → the lower magnet 1 → the yoke 2.
The magnetic flux of the lower magnet 1 returns to the lower magnet 1 via the yoke 2 → the upper magnet 1 → the armature 3. Since the magnetic flux of the magnets 1, 1 flows through the yoke 2 in this way, if the thickness of the yoke 2 is small, magnetic saturation occurs, resulting in a problem that the magnetic force of the magnets 1, 1 cannot be used effectively.

In order to avoid the above-mentioned magnetic saturation, it is necessary to enlarge the magnetic flux path by making the thickness A of the yoke 2a thicker than before, as shown in FIG. On the other hand, the second
As shown in the curve diagram B-H, the magnetizing magnetic field in curve 14, which shows the magnetization state of a high-energy magnet, is stronger than the magnetization field that magnetizes the ferrite magnet 100% in curve 13, which shows the magnetization state of a conventional ferrite magnet. It is necessary to make the magnetizing magnetic field stronger to 100% magnetize the high-energy magnets, but when trying to magnetize the magnets 1a, 1a, the magnetizing power source 6 is turned on by the switch 7 as shown in FIG. When connected to the magnetizing coil 5 through
a, magnetic flux path 1 flowing through armature 3 and magnet 1a
However, since the thickness A of the yoke 2a has increased, the leakage magnetic flux flowing into the magnetic flux path 11 becomes relatively large, and it becomes difficult for the magnetic flux to flow into the magnetic flux path 10 including the magnets 1a, 1a. magnet 1
There is a drawback that in order to sufficiently magnetize a and 1a, a magnetizing device with an extremely large capacity is required. In addition, as mentioned above, in order to avoid magnetic saturation when using a high-energy magnet, if a yoke 2a with a large thickness A and a sufficient magnetic path cross-sectional area is used, the weight of the yoke 2a becomes large and the motor 8 becomes difficult to reduce in weight.

[Purpose of the invention]

The present invention has been made in view of the above, and is a permanent magnet type that can be easily magnetized without increasing the capacity of the magnetizing device even when using a high-energy magnet, and is lightweight. The purpose is to provide a method for manufacturing a rotating electric machine.

[Summary of the invention]

In order to achieve the above object, the present invention integrates a high energy magnet, a first yoke equipped with the high energy magnet on its inner periphery, and an armature disposed inside the high energy magnet into a magnetizing device. Next, a magnetizing coil wound around the magnetizing core is energized to generate a magnetic flux in the magnetizing core, and this magnetic flux is transferred to the first yoke. The high energy magnet is magnetized by flowing a magnetic flux path through the high energy magnet and the armature, and then the high energy magnet, the first yoke, and the armature are connected to the open end of the magnetized core. Next, on the outer periphery of the first yoke, a second yoke having an axial length approximately equal to the axial length of the high-energy magnet is placed at a position overlapping the high-energy magnet.
A manufacturing method is adopted in which a yoke is attached.

〔Example〕

The present invention will be described below with reference to embodiments shown in the drawings. In FIG. 4, a magnetizing coil 5 that flows a magnetic flux 9 is wound around a U-shaped magnetizing core 4, and a magnetizing power source 6 is connected to this magnetizing coil 5 via an on/off switch 7. A magnetizing device is configured. And between the open ends of the magnetizing core 4 of this magnetizing device,
A motor 8 having the following configuration is inserted. That is, this motor 8 has two arc-shaped magnets 1a, 1a made of high-energy magnets attached to the inner circumference of a cylindrical yoke 2b, which is a first yoke, and Armature winding 3 in space
The motor is configured such that an armature 3 wound with a wire a is rotatably arranged, and this motor is inserted between the open ends of the magnetized core 4. Here, the thickness B of the yoke 2b is
Taking into consideration that the permeance coefficient does not decrease significantly when the magnet 1a is magnetized as shown in FIG. 4 and when the motor 8 is removed from the magnetized core 4 after magnetization is completed, That is, the thickness B of the yoke 2b is set to the minimum necessary value in consideration of the amount of demagnetization when the motor 8 is extracted from the magnetized core 4. However, in reality, the yoke 2b also serves as an end frame for rotating the armature 3 due to the structure of the motor 8, so it is set to a size that satisfies the strength required as an end frame due to the needs of the magnetic circuit. There is.

Next, in the above state, when the on-off switch 7 is closed and current is supplied from the magnetizing power source 6 to the magnetizing coil 5, magnetic flux 9 flows through the magnetizing core 4, and this magnetic flux 9 flows through the magnetic flux path in the motor 8 through the yoke 2b. 11
and a magnetic flux path 10 flowing through the magnet 1a, the armature 3, and the magnet 1a. Since the thickness B of the yoke 2b is set to the minimum necessary value, the magnetic flux path 11 flowing through the yoke 2b quickly becomes magnetically saturated, and most of the magnetic flux 9 flows through the path 1.
Since the current flows on the 0 side, the magnets 1a, 1a can be reliably and sufficiently magnetized. Here, magnet 1
In FIG. 4, magnets a and 1a are magnetized such that their upper surfaces are S poles and their lower surfaces are N poles.

After the magnets 1a, 1a are magnetized, the yoke 2b, to which the magnets 1a, 1a are fixed to the inner periphery, is taken out from the magnetized core 4 together with the armature 3. next,
As shown in FIGS. 5 and 6, a cylindrical second yoke 15 having an axial length that is approximately the same as the axial length of the arc-shaped magnet 1a is attached to the outer periphery of the first yoke 2b. 1a and 1a so that they overlap and are fixed. Here, when operated as a motor, the magnetic fluxes of the magnets 1a, 1a flow as follows in FIG. The magnetic flux emitted from the upper magnet 1a returns to the upper magnet 1a through a path of armature 3→lower magnet 1a→yoke 2b and yoke 15. The magnetic flux of the lower magnet 1a is the same as that of the yoke 2b and the yoke 1.
5 → Upper magnet 1a → Return to lower magnet 1a via armature 3. Further, by changing the radial thickness C of the second yoke 15, that is, the width of the magnetic path, it is possible to adjust the amount of magnetic flux when working as a motor and change the output characteristics of the motor. Furthermore, since the yoke 15 having an axial length that is almost the same as the axial length of the magnets 1a, 1a is fitted and fixed so as to overlap the magnets 1a, 1a, this second yoke 15 is different from the first yoke 15. It can be configured to be smaller than the yoke 2b, and the weight of the motor 8 can be reduced compared to a structure in which the first yoke 2b is simply made thicker.

Further, in the magnet characteristic diagram of FIG. 8, MA indicates the demagnetization characteristic curve of the high energy magnet, and MB indicates the demagnetization characteristic curve of the ferrite magnet. What is clear from this is that high-energy magnets (for example, rare earth magnets such as the product name "NEOMAX-35" manufactured by Sumitomo Special Metals Co., Ltd.) not only have a large residual magnetic flux density -B but also an extremely large coercive force -H.

Therefore, when the motor 8 is taken out from the magnetizing core 4 after being magnetized with the first yoke 2b as shown in FIG. 4, the perminance coefficient of the magnetic path as seen from the magnet 1a decreases. Also, the residual magnetic flux density B will not be extremely reduced (demagnetized).

[Other Examples]

In the embodiment described above, the yoke 15 which is the second yoke is cylindrical, but as shown in FIG. and 15b, and connect it to the first yoke 2b as shown in FIG.
It may be attached on the outer periphery of the yoke 2b at a position overlapping the magnets 1a, 1a, and fixed to the outer periphery of the yoke 2b using a band, adhesive, or the like.

Also in the embodiments shown in FIGS. 7 and 9, when operated as a motor, the upper and lower magnets 1a, 1a
The magnetic flux flows along the same path as in the previous embodiment.

That is, as shown in FIG. 9, two arc-shaped second yokes 15a, 15b are attached to the outer periphery of the first yoke 2b at positions overlapping the magnets 1a, 1a, and Since the thickness B of the yoke 2b is set to the minimum necessary value as in the previous embodiment, the magnetic flux emitted from the upper magnet 1a is transferred from the armature 3 to the lower magnet 1a in FIG. →
First yoke 2b and second yoke 15a, 1
It returns to the upper magnet 1a along the route 5b. On the other hand, the magnetic flux of the lower magnet 1a returns to the lower magnet 1a via the first yoke 2b and the second yokes 15a, 15b, the upper magnet 1a, and the armature 3.

Note that the term "high energy magnet" as used in the present invention refers to a magnet using, for example, a rare earth element, which has a large residual magnetic flux density and a large coercive force. In particular, among rare earth magnets, those whose demagnetization curve is approximately linear like MA in FIG. 8 are suitable.

〔Effect of the invention〕

As described above, in the present invention, a high-energy magnet, a first yoke equipped with the high-energy magnet on its inner periphery, and an armature disposed inside the high-energy magnet are integrated into a magnetizing device. The magnetizing core is inserted between the open ends of the magnetizing core, and then the magnetizing coil wound around the magnetizing core is energized to generate a magnetic flux in the magnetizing core, and this magnetic flux is transferred to the first yoke, The high energy magnet is magnetized by flowing a magnetic flux path through the high energy magnet and the armature, and then the high energy magnet, the first yoke, and the armature are connected to the open end of the magnetized core. Next, on the outer periphery of the first yoke, a second yoke having an axial length approximately equal to the axial length of the high-energy magnet is placed at a position overlapping the high-energy magnet.
Since the manufacturing method of attaching a yoke is adopted, the following excellent effects can be obtained.

(1) When magnetizing a high-energy magnet, only the first yoke is interposed in the magnetic flux path of the magnetizing magnetic flux, whereas when operating as a rotating electric machine, both the first yoke and the second yoke are By interposing the magnetic flux path of the high-energy magnet, magnetic saturation in the yoke during operation of the rotating electrical machine can be eliminated, and the magnetic force of the high-energy magnet can be effectively used to increase the output of the rotating electrical machine.

(2) By adding the second yoke to the first yoke as described above, the magnetic saturation of the high-energy magnet during operation of the rotating electric machine can be eliminated, so the thickness of the first yoke is sufficient. It can be made small, thereby sufficiently reducing leakage of magnetic flux to the first yoke during magnetization. Therefore, even a small-capacity magnetizing device can sufficiently magnetize a high-energy magnet.

(3) Since the second yoke has an axial dimension that is approximately the same as the axial dimension of the high-energy magnet, it is dimensionally smaller than the first yoke. The weight of the rotating electric machine can be reduced compared to the case where the thickness is simply increased.

[Brief explanation of the drawing]

Figure 1 is a front view of a rotating electric machine and magnetizing device using conventional magnets, Figure 2 is a characteristic diagram of magnetic flux density versus magnetic field strength for ferrite magnets and high-energy magnets, and Figure 3 is a diagram of magnetic flux density with respect to magnetic field strength for ferrite magnets and high-energy magnets. FIG. 4 is a schematic front view showing the flow of magnetic flux in the conventional rotating electrical machine and magnetizing device used; FIG. A schematic front view, FIG. 5 is an exploded perspective view when the second yoke is fitted to the first yoke of a rotating electric machine according to an embodiment of the present invention, and FIG. 6 is a high energy diagram according to an embodiment of the present invention. 7 is a perspective view showing a second yoke in another embodiment of the present invention, and FIG. 8 is a reverse view of a ferrite magnet and a high-energy magnet. It is a characteristic diagram of magnetic flux density with respect to a magnetic field. FIG. 9 is a sectional view of a completed rotating electrical machine using the second yoke in another embodiment shown in FIG. 7, as seen from the front. 1a... High energy magnet, 2b... First yoke, 3... Armature, 4... Magnetized core, 5... Magnetized coil, 15, 15a, 15b... Second yoke.

Claims (1)

[Claims] 1. A high-energy magnet formed in an arcuate shape, and a cylindrical first magnet with this high-energy magnet attached to the inner periphery.
The yoke and the armature placed inside the high-energy magnet are inserted as one body between the open ends of the magnetizing core of the magnetizing device, and then the magnetizing coil wound around the magnetizing core is inserted. energizes to generate magnetic flux in the magnetized core, and causes this magnetic flux to flow through a magnetic flux path passing through the first yoke, the high-energy magnet, and the armature, thereby magnetizing the high-energy magnet, and then The high-energy magnet, the first yoke, and the armature are taken out from between the open ends of the magnetized core, and then placed on the outer periphery of the first yoke at a position overlapping the high-energy magnet, A method for manufacturing a permanent magnet rotating electrical machine, comprising: installing a cylindrical or arcuate second yoke having an axial length substantially equal to the axial length of the high-energy magnet.