JPH09201018A - Commutator motor and magnetizing device - Google Patents

Abstract

(57) Abstract: The present invention prevents deterioration of a brush and a commutator. SOLUTION: The permanent magnet 13 has two main magnetic poles 20, 21.
Is formed. Moreover, at the magnetic pole boundary portion of each permanent magnet 13, the main magnetic poles 20 and 21 and the auxiliary magnetic poles 20a and 21 opposite to the main magnetic poles 20 and 21 in the range where the circumferential width is θ and the axial length is approximately L / 2.
a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a commutator motor and a magnetizing device in which a permanent magnet is improved.

[0002]

FIG. 14 shows an example of a commutator motor. The stator 1 is configured by attaching permanent magnets 3 that alternately form N poles and S poles in the circumferential direction on the inner peripheral surface of a frame 2 that also serves as a stator yoke. The rotor 4 is configured by mounting a rotor core 6 on a rotating shaft 5 and providing windings 7 of a plurality of phases on the rotor core 6. A commutator 8 is provided on the rotor 4 side, and a brush 9 that contacts the commutator 8 and energizes the winding 7 of each phase is provided on the stator 1 side.

As the permanent magnets 3, as shown in FIG. 15, two permanent magnets are magnetized in a single pole. Further, the air gap G between the permanent magnets 3 is a section in the circumferential direction that does not contribute to the rotation torque, and when the commutator 8 and the brush 9 commutate, an induced voltage is applied to the winding 7 connected to the brush 9. It is provided in the range where it does not occur.

As shown in FIG. 16, in the case of a four-pole motor, four single-pole magnetized permanent magnets 3 are provided. Also in this case, the gap G between the permanent magnets 3 is a section in the circumferential direction that does not contribute to the rotation torque, and the commutator 8 and the brush 9 are provided.
It is provided in a range where an induced voltage is not generated in the winding wire 7 connected to the brush 9 during commutation due to.

By the way, if the commutator motor has a multi-pole structure, the number of permanent magnets increases, resulting in an increase in cost due to an increase in the number of parts and a deterioration in quality. As a countermeasure against this, when a plurality of magnetic poles are magnetized with respect to one permanent magnet, an induced voltage is generated in a winding crossing this magnetic pole boundary portion at the time of energization switching by a commutator and a brush. In this case, one brush is in contact with a plurality of commutators and short-circuits the windings connected to the commutators. As a result, there is a problem that sparks or the like are generated between the brush and the commutator, and these deteriorate.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a commutator motor and a magnetizing device capable of preventing deterioration of a brush and a commutator.

[0007]

A commutator motor according to the present invention includes a stator having a permanent magnet, a rotor provided inside the stator and having a rotor core provided with windings.
A commutator and a brush for commutating with respect to the winding of the rotor, wherein the brush commutates by contacting a plurality of commutators, the plurality of permanent magnets are arranged in a circumferential direction. At the same time, two or more main magnetic poles are uniformly formed in each permanent magnet, and the rotation angle width in which an induced voltage is generated in the winding commutated during the commutation is θ, and the axial length of each permanent magnet is Assuming L, the circumferential width is θ and the axial length is approximately L / 2 at the boundary between the main magnetic poles of each permanent magnet.
It is characterized in that an auxiliary magnetic pole which is opposite to the main magnetic pole is formed within the range.

In the commutator motor of this structure, since the permanent magnet is magnetized with two or more main magnetic poles, the number of permanent magnets, that is, parts, is larger than that of a permanent magnet having a single-pole magnetization. The number can be reduced and the cost can be reduced. Moreover, an auxiliary magnetic pole, which is opposite to the main magnetic pole, is formed at the magnetic pole boundary of each permanent magnet within the range of the circumferential width θ and the axial length of approximately L / 2. The total amount of magnetic flux becomes zero, and no induced voltage is generated in the winding facing the auxiliary magnetic pole during energization switching, that is, during commutation.Therefore, sparks may occur between the commutator and the brush. Absent.

In this case, the permanent magnet may be formed in a cylindrical shape, and main poles of different magnetic poles may be alternately and evenly formed in the circumferential direction in the permanent magnet. The number of parts can be reduced and the cost can be reduced as compared with the case where a permanent magnet is used. And
By forming the auxiliary magnetic poles similar to those described above at the magnetic pole boundaries of the permanent magnets, it is possible to prevent generation of induced voltage in the windings facing the auxiliary magnetic poles at the time of energization switching, that is, commutation.

The magnetizing device of the present invention magnetizes the material of the permanent magnet in the commutator motor described above, wherein an inner yoke arranged on the inner surface of the material and an outer material arranged on the outer surface of the material. A main inner protrusion is formed on the inner yoke so as to face a region of the material excluding the angular width θ, and each of the axial half regions of the region of the material facing the angular width θ. Each of the sub inner protrusions is formed, the main inner winding is wound around the main inner protrusion, and the sub inner windings are wound around the respective sub inner protrusions in opposite directions to each other. The sub-outer winding is formed so that each sub-outer protrusion is formed so as to face each sub-inner protrusion, and a magnetic flux in the same direction as each sub-inner protrusion that opposes each sub-outer protrusion is generated. To It is characterized by being wound.

In this magnetizing device, a plurality of main magnetic poles are magnetized on the material of the magnet by energizing the main inner winding wound around the main inner protrusion on the inner yoke, and the inner yoke is By energizing the sub inner windings wound around the sub inner protrusions in opposite directions and the sub outer windings wound on the outer outer protrusions of the outer yoke, Auxiliary magnetic poles opposite to the main magnetic pole are magnetized within a range where the circumferential width is θ and the axial length is approximately L / 2.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. First, FIG.
Now, a schematic configuration of, for example, a 4-pole commutator motor 10 will be described. The stator 11 is configured by attaching, for example, two permanent magnets 13 to the inner peripheral surface of the frame 12 that also serves as a stator yoke. In the rotor 14, the rotor core 16 is attached to the rotary shaft 15 and the rotor core 16
Is provided with a multi-phase winding 17. And
A commutator 18 is provided on the rotor 14 side, and a brush 19 that contacts the commutator 18 and energizes the winding 17 of each phase is provided on the stator 11 side.

Each of the permanent magnets 13 has an N-pole main pole 2
The main poles 21 of 0 and S poles are evenly magnetized. Each permanent magnet 13 is attached to the frame 12 so that the main magnetic poles 20 and 21 thereof are alternately arranged in the circumferential direction.

Now, the rotation angle width in which the induced voltage is generated in the commutated winding is θ, and the axial length of each permanent magnet 13 is L.
Then, in the permanent magnet 13, in the boundary portion of the main magnetic pole 20, in the range of the angular width θ and the length in the axial direction of L / 2,
Auxiliary magnetic pole 20 that is the opposite pole to the main magnetic pole 20, that is, the S pole
a is formed. Further, an auxiliary magnetic pole 21a which is a pole opposite to the main magnetic pole 21, that is, an N pole is also formed in the boundary portion of the main magnetic pole 21 within a range of the angular width θ and a length of L / 2 in the axial direction. .

The permanent magnets 13 are magnetized by the magnetizing device 22 shown in FIGS. The magnetizing device 22 will be described. That is, the magnetizing device 22
Is provided with an inner yoke 23 arranged on the inner surface side of the material A of the permanent magnet 13 and an outer yoke 24 arranged on the outer surface side of the material A.

Since the inner yoke 23 is symmetrical with respect to the center line 23a shown in FIG. 4, the half on one side will now be described. The main inner protrusion 2 is arranged so as to face the area of the material A excluding the angular width θ.
5 and 26 are formed, and main inner protrusions 25 and 26 are formed.
In the boundary portion between and, sub inner protrusions 25a and 25b and 26a and 26b are formed in the respective axial half regions of the region substantially facing the angular width θ of the material A.

A main inner winding 27 is wound around the main inner protruding portion 25 so as to form the N-pole main magnetic pole 20 on the material A, and the sub inner protruding portions 25a and 25b are wound.
The sub inner windings 27a, so that they are in opposite directions to each other.
27b is wound. A main inner winding 28 is wound around the main inner protruding portion 26 so as to form the S-pole main magnetic pole 21 on the material A, and the sub inner protruding portion 26 is wound.
Sub inner windings 28a and 28b are wound around a and 26b so as to be opposite to each other.

On the other hand, the outer yoke 24 has sub-outer protrusions 29a, 29b, 30a, and 29a, 25b, 26a, 26b facing the respective sub-inner protrusions 25a, 25b, 26a, 26b.
30b, and each of the sub-outer protrusions 29a, 29
b sub-outer winding 31 so that magnetic flux in the same direction as that of each sub-inner protrusion facing b, 30a, 30b
A, 31b, 32a and 32b are wound.

Therefore, the material A attached to the frame 2 is arranged between the inner yoke 23 and the outer yoke 24, and the respective windings 27, 27a, 27b, 28, 28a, 28 are arranged.
b, 31a, 31b, 32a, 32b are energized, the magnetic flux generated in the main inner protrusion 25 causes the main magnetic pole 20
While most of the (N pole) is magnetized, the auxiliary magnetic pole 20a (S pole) is magnetized by the magnetic flux generated in the sub inner protrusion 25a and the sub outer protrusion 29a, and the sub inner protrusion 25b and A part of the main magnetic pole 20 (N pole) is magnetized in the lower portion of the auxiliary magnetic pole 20a (S pole) by the magnetic flux generated in the sub outer protruding portion 29b.

Further, most of the main magnetic pole 21 (S pole) is magnetized by the magnetic flux generated in the main inner protrusion 26, and the sub inner protrusion 26a and the sub outer protrusion 30a are also magnetized.
The auxiliary magnetic pole 21a (N pole) is magnetized by the magnetic flux generated in the sub-inside projection 26b and the sub-outside projection 30.
With b, a part of the main magnetic pole 21 (S pole) is magnetized in the lower portion of the auxiliary magnetic pole 21a (N pole).

In such a commutator motor 10,
Each of the plurality of permanent magnets 13 of the permanent magnet 13 has a two-pole main magnetic pole 2.
Since 0 and 21 are magnetized, it is possible to reduce the number of permanent magnets, that is, the number of parts, as compared with the case where a single-pole magnetized permanent magnet is used, which contributes to cost reduction. In addition, auxiliary magnetic poles 20a and 21a opposite to the main magnetic poles 20 and 21 are formed in the magnetic pole boundary portion of each permanent magnet 13 in the range where the width in the circumferential direction is θ and the length in the axial direction is approximately L / 2. Therefore, the total amount of magnetic flux in this portion becomes zero. That is, FIG. 7 (a)
7 shows the magnetic flux density of the portion La (shown in FIG. 1) of the permanent magnet 13, and FIG. 7B shows the height L of the permanent magnet 13.
The magnetic flux density of the portion b (shown in FIG. 1) is shown, and the total magnetic flux density of the permanent magnet 13 is shown in FIG.

As can be seen from FIG. 7, the main pole 20
At the boundary of (21), the auxiliary magnetic pole 20a (21
The magnetic flux of a) and the magnetic flux of the main magnetic pole 20 (21) are canceled out, and the total amount of magnetic flux becomes zero. As a result, no induced voltage is generated in the winding facing the portion of the angular width θ when switching the energization, that is, during commutation.
No spark is generated between 9 and the commutator 18. Therefore, the deterioration of the brush 19 and the commutator 18 can be effectively prevented.

Further, in the above-described magnetizing device 22, the main inner protrusion 25 of the inner yoke 23 and the inner yoke 23.
The main magnetic pole 20 is magnetized by the sub inner protrusion 25b of the inner yoke 23 and the sub outer protrusion 29b of the outer yoke 24, and the sub inner protrusion 25a of the inner yoke 23 and the outer yoke 2 are magnetized.
The auxiliary magnetic pole 20a can be favorably magnetized by the sub outer protrusion 29a of No. 4. Particularly, in order to magnetize the auxiliary magnetic pole 20a, not only the inner sub-projection 25a and the winding 27a are provided on the inner yoke 23, but also the sub-external projection 29a and the winding 31a are provided on the outer yoke 24. Therefore, the magnetization is performed from both the inside and outside, and even if the thickness of the material A is large, the complete saturation magnetization can be performed. As a result, the auxiliary magnetic pole 20a can be surely magnetized although the magnetizing area is small. In addition, other main magnetic poles 21 and auxiliary magnetic poles 2
Similarly, 1a can be magnetized well.

FIG. 8 shows a second embodiment of the present invention. In this embodiment, the permanent magnet 41 has a first structure.
Is different from the embodiment. That is, the permanent magnet 41 is formed in a cylindrical shape, and the four main magnetic poles 42 to 45 are uniformly magnetized to the permanent magnet 41, and each main magnetic pole 42 is formed.
The auxiliary magnetic pole 42 is provided at the boundary portion (both ends) of
a, 42b, 43a, 43b, 44a, 44b, 45
a and 45b are magnetized respectively. In the second embodiment, since all poles are formed in one permanent magnet 41, the number of permanent magnets, that is, the number of parts can be further reduced, which can further contribute to cost reduction.

FIG. 9 shows a third embodiment of the present invention, which is different from the first embodiment in the following points. That is, the groove 51 extending in the axial direction is formed in the boundary portion between the main magnetic poles 20 and 21 on the outer surface side of the permanent magnet 13, and the convex portion 52 that fits into this groove 51 is formed on the inner surface side of the frame 12.

According to this embodiment, since the groove 51 extending in the axial direction is formed at the boundary portion between the main magnetic poles 20 and 21, even if the material A has a large thickness, this boundary portion (the auxiliary magnetic pole 20) is formed.
Completely saturated magnetization of the portions (a, 21a) becomes easy. Also,
On the inner surface side of the frame 12, a convex portion 52 that fits into this groove 51
By forming the frame 12, the frame 12 and the permanent magnet 1 are formed.
The positioning of the permanent magnet 13 is easy and the permanent magnet 13 can be prevented from rotating in the circumferential direction.

FIG. 10 shows a fourth embodiment of the present invention, and is different from the first embodiment in the following points. That is, the groove 53 extending in the axial direction is formed in the boundary portion between the main magnetic poles 20 and 21 on the inner surface side of the permanent magnet 13. According to this embodiment, since the groove 53 extending in the axial direction is formed in the boundary portion between the main magnetic poles 20 and 21, even if the material A has a large thickness, the boundary portion (the auxiliary magnetic poles 20a and 21a portion) is completely formed. Saturation magnetization becomes easy.

FIG. 11 shows a fifth embodiment of the present invention, which is different from the first embodiment in the following points. That is, the auxiliary magnetic poles 20a and 21a in the permanent magnet 13 are magnetized so that one of the circumferential widths at both axial ends, in this case, the circumferential width W at the upper end is equal to or greater than the angular width θ. . According to this embodiment, the torque ripple can be reduced. The same effect can be obtained even if the widths of the lower ends of the auxiliary magnetic poles 20a and 21a in the circumferential direction are not less than the angular width θ.

FIG. 12 shows a sixth embodiment of the present invention. In this embodiment, the magnetizing device 61 is different from the magnetizing device 22 in the first embodiment. That is, the magnetizing device 61 is composed of only the inner yoke 23.
According to this embodiment, the magnetizing device 61 can be downsized and simplified, and the magnetizing work can be facilitated. The magnetizing device 71 is suitable for forming the permanent magnet 13 shown in FIG.

FIG. 13 shows a seventh embodiment of the present invention, in which the magnetizing device 71 is different from the magnetizing device 22 in the first embodiment. That is, the magnetizing device 71 includes the inner yoke 72 and the outer yoke 24, and the inner yoke 72 is the magnetizing device 2 in the first embodiment.
2 is different from the inner yoke 23. That is, on the inner yoke 72 of the magnetizing device 71 of the present embodiment, the main inner protrusion 2 is arranged so as to face the region of the material A excluding the angular width θ.
5 and 26 are formed, the sub inner protrusions 25a, 25b, 26a and 26b in the first embodiment are not formed, and accordingly, the sub inner winding 27 is formed.
There is no a, 27b, 28a, 28b.

According to this embodiment, compared with the magnetizing device 22 of the first embodiment, the magnetizing device 71 can be simplified, and the magnetizing device 61 of the sixth embodiment can be compared. Different,
Since the sub-outer protrusions 29a, 29b, 30a, 30b are provided on the outer yoke 24, the winding space of the winding can be made large and the auxiliary magnetic pole can be easily magnetized. The magnetizing device 71 is suitable for forming the permanent magnet 13 shown in FIG.

[0032]

As apparent from the above description, the present invention has the following effects. According to the commutator motor of claim 1, since the permanent magnet is magnetized with a plurality of main magnetic poles, the number of parts can be reduced and the cost can be reduced as compared with the case where a single-pole magnetized permanent magnet is used. Can contribute to cost reduction, and
When the rotation angle width at which the induced voltage is generated in the winding at the time of commutation is θ and the axial length of each permanent magnet is L, the width in the circumferential direction is at the boundary of the main magnetic poles of each permanent magnet. Since the auxiliary magnetic pole that is the opposite pole to the main magnetic pole is formed in the range where the axial length is approximately L / 2 at θ, no induced voltage is generated in the winding during commutation, and therefore the brush and the rectifier are rectified. It is possible to prevent the generation of sparks with the child and effectively prevent the deterioration of these brushes and commutators.

According to the commutator motor of claim 2, since the permanent magnet is formed in a cylindrical shape and a plurality of main magnetic poles are magnetized to the permanent magnet, the number of parts can be further reduced and the cost can be reduced. It can further contribute to cost reduction. According to the commutator motor of the third aspect, since the groove extending in the axial direction is formed at the boundary portion of the main pole on the outer surface side of the permanent magnet, the complete saturation magnetization of the auxiliary pole can be achieved even if the material is thick. It will be easy.

According to the commutator motor of the fourth aspect, since the groove extending in the axial direction is formed in the boundary portion of the main pole on the inner surface side of the permanent magnet, the auxiliary pole is completely saturated even if the material is thick. Magnetization becomes easy.

According to the commutator motor of the fifth aspect, since the auxiliary magnetic pole is magnetized so that one of the widths of both ends in the axial direction becomes the angular width θ or more, the torque ripple can be reduced.

According to the magnetizing device of the sixth aspect, the main inner protrusion is formed on the inner yoke so as to face a region of the material of the permanent magnet excluding the angle width θ, and the angle width θ of the material is formed. Sub inner protrusions are formed in the respective axial half regions of the regions facing each other, the main inner windings are wound around the main inner protrusions, and the sub inner protrusions are arranged so as to be opposite to each other. Wind the inner winding,
Each sub-outer protrusion is formed on the outer yoke so as to face each of the sub-inner protrusions, and each sub-outer protrusion is formed so as to generate a magnetic flux in the same direction as each sub-inner protrusion facing each sub-outer protrusion. Since it has a structure in which the outer winding is wound,
The material is magnetized from both the inside and outside, allowing full saturation magnetization even if the material is thick. As a result, the auxiliary magnetic pole can be reliably magnetized even though the magnetizing area is small.

According to the magnetizing device of the seventh aspect, since the magnetizing device is composed of only the inner yoke, the magnetizing device can be miniaturized and simplified, and the magnetizing work can be facilitated. You can

According to the magnetizing device of the eighth aspect, an inner yoke having a main inner protrusion for magnetizing the main magnetic pole and a main inner winding, a sub outer protrusion for magnetizing the auxiliary magnetic pole, and a sub outer winding. Since it is composed of an outer yoke provided with a wire, it can contribute to simplification of the magnetizing device, a large winding space for the winding, and easy magnetization of the auxiliary magnetic pole. it can.

[Brief description of drawings]

FIG. 1 is a perspective view of a permanent magnet showing a first embodiment of the present invention.

FIG. 2 is a side view in which a half of a motor is longitudinally sectioned.

FIG. 3 is a transverse plan view partially showing the magnetizing device.

FIG. 4 is a perspective view of an inner yoke.

FIG. 5 is a diagram showing the outer surface of the inner yoke in a developed manner.

FIG. 6 is a partial perspective view of an outer yoke.

FIG. 7 is a diagram showing magnetic flux densities of various parts in the permanent magnet.

FIG. 8 is a perspective view of a permanent magnet showing a second embodiment of the present invention.

FIG. 9 is a partially exploded perspective view of a permanent magnet and a frame showing a third embodiment of the present invention.

FIG. 10 is a partial perspective view of a permanent magnet showing a fourth embodiment of the present invention.

FIG. 11 is a partial perspective view of a permanent magnet showing a fifth embodiment of the present invention.

FIG. 12 is a view corresponding to FIG. 3 showing a sixth embodiment of the present invention.

FIG. 13 is a view corresponding to FIG. 3 showing a seventh embodiment of the present invention.

FIG. 14 is a side view in which a half of a motor showing a conventional example is longitudinally sectioned.

FIG. 15 is a perspective view of a permanent magnet.

FIG. 16 is a perspective view of a permanent magnet showing a different conventional example.

[Explanation of symbols]

10 is a commutator motor, 11 is a stator, 12 is a frame,
13 is a permanent magnet, 13a and 13b are permanent magnets, 14 is a rotor, 16 is a rotor core, 17 is a winding wire, 18 is a commutator,
Reference numeral 19 is a brush, 20 and 21 are main magnetic poles, 20a and 21a are auxiliary magnetic poles, 22 is a magnetizing device, 23 is an inner yoke, 24 is an outer yoke, 25 and 26 are main inner protrusions, 25a,
26a is a sub inner protrusion, 27a and 27b are sub inner windings, 28 is a main inner winding, 28a and 28b are sub inner windings, 29a, 29b, 30a and 30b are sub outer protrusions, 31a, 31b and 32a. , 32b are sub-outer windings,
41 is a permanent magnet 41, 42 to 45 are main magnetic poles, 42
a, 42b, 43a, 43b, 44a, 44b, 45
Reference numerals a and 45b are auxiliary magnetic poles, 51 is a groove, 52 is a convex portion, 53 is a groove, 61 is a magnetizing device, 71 is a magnetizing device, and 72 is an inner yoke.

Claims (8)

[Claims] 1. A stator having a permanent magnet, a rotor provided inside the stator and having a winding on a rotor core, and for commutating with respect to the winding of the rotor. A commutator and a brush, wherein the brush contacts and commutates a plurality of commutators, a plurality of the permanent magnets are provided so as to be arranged in the circumferential direction, and each permanent magnet has two or more main magnetic poles. And the rotation angle width at which induced voltage is generated in the winding commutated during the commutation is θ and the axial length of each permanent magnet is L, the boundary of the main magnetic poles of each permanent magnet A commutator motor, wherein an auxiliary magnetic pole, which is a magnetic pole opposite to the main magnetic pole, is formed in the portion in the range where the width in the circumferential direction is θ and the length in the axial direction is approximately L / 2. 2. A stator having a permanent magnet, a rotor provided inside the stator and having a winding on a rotor core, and for commutating with respect to the winding of the rotor. A commutator and a brush, in which the brush contacts a plurality of commutators to perform commutation, the permanent magnet is formed into a cylindrical shape, and the permanent magnet is provided with main magnetic poles having different magnetic poles in the circumferential direction. If the rotation angle width at which the induced voltage is generated in the winding commutated during the commutation is θ and the axial length of the permanent magnet is L, the boundary portion of the main magnetic poles of the permanent magnet is formed alternately. In addition, a commutator motor is characterized in that an auxiliary magnetic pole having a pole opposite to the main magnetic pole is formed within a range in which the circumferential width is θ and the axial length is approximately L / 2. 3. The commutator motor according to claim 1, wherein a groove extending in the axial direction is formed at a boundary portion of the main pole on the outer surface side of the permanent magnet. 4. The commutator motor according to claim 1, wherein a groove extending in the axial direction is formed in a boundary portion of the main pole on the inner surface side of the permanent magnet. 5. The commutator motor according to claim 1, wherein the auxiliary magnetic pole is formed so that one of the widths at both ends in the axial direction has an angular width θ or more. 6. The material for magnetizing the permanent magnet in the commutator motor according to claim 1, wherein an inner yoke arranged on the inner surface side of the material and an outer yoke arranged on the outer surface side of the material. A main inner protrusion is formed on the inner yoke so as to face a region of the material excluding the angular width θ, and each sub-region is formed in each axial half region of the region of the material facing the angular width θ. An inner protrusion is formed, a main inner winding is wound around the main inner protrusion, sub inner windings are wound around the respective sub inner protrusions in opposite directions, and the outer yoke, Each sub-outer protrusion is formed so as to face each sub-inner protrusion, and the sub-outer winding is wound so that a magnetic flux in the same direction as each sub-inner protrusion facing each sub-outer protrusion is generated. Times Magnetizing apparatus, characterized in that the. 7. The material for magnetizing the permanent magnet in the commutator motor according to claim 1, further comprising an inner yoke arranged on the inner surface side of the material, wherein the inner yoke has an angular width in the material. The main inner protrusion is formed so as to face the region excluding θ, and the sub inner protrusion is formed in each axial half region of the region facing the angular width θ in the material, and the main inner protrusion is formed on the main inner protrusion. A magnetizing device characterized in that a main inner winding is wound, and the sub inner winding is wound around each of the sub inner protruding portions in directions opposite to each other. 8. A magnetizing material for a permanent magnet in a commutator motor according to claim 1, wherein an inner yoke arranged on the inner surface side of the material and an outer yoke arranged on the outer surface side of the material. A main inner protrusion is formed on the inner yoke so as to face a region of the material other than the angular width θ, and a main inner winding is wound around the main inner protrusion, and the outer yoke is provided with the main inner winding. The sub-outer protrusions were formed in each axial half of the area facing the angular width θ of the material, and the sub-outer windings were wound around the sub-outer protrusions in opposite directions. Characterizing magnetizing device.