KR20230096166A - Magnetic device of double spoke type rotor - Google Patents

Abstract

The present invention relates to a magnetizing device for a double-spoke-type rotor to increase magnetization efficiency in magnetizing a permanent magnet of a double-spoke-type rotor. According to the present invention, the magnetizing device magnetizes a permanent magnet of a double-spoke-type rotor. The magnetizing device comprises: a yoke including a receiving space; a first group of teeth formed on one side of the inner peripheral surface of the yoke and formed of three teeth spaced apart from each other; a second group of teeth formed on the other side of the inner peripheral surface of the yoke and formed of three teeth spaced apart from each other; and a coil wound on the teeth. Each of the first and second teeth groups includes two teeth located at the outermost side and a central tooth located between the two outer teeth, a rotor core into which the permanent magnet is inserted is disposed in the receiving space, and the outer end part of the outer tooth is located on the outer peripheral surface of the central core located between a pair of permanent magnets forming one pole.

Description

Magnetizing device of double spoke type rotor {Magnetic device of double spoke type rotor}

The present invention relates to a magnetizing device for magnetizing a permanent magnet included in a rotor, and more particularly, to a magnetizing device for magnetizing a permanent magnet of a double spoke type rotor.

A motor is a machine that obtains rotational force from electrical energy, and includes a stator and a rotor. The rotor is disposed inside or outside the stator to interact with the stator electromagnetically, and is rotated by a force acting between a magnetic field and a current flowing in a coil.

Permanent magnet motors that use permanent magnets to generate a magnetic field include surface mounted permanent magnet motors, interior type permanent magnet motors, and spoke type permanent magnet motors. magnet motor). Among them, the spoke-type permanent magnet motor has the advantage of being able to generate high torque and high output because of structurally high magnetic flux concentration, and miniaturization of the motor for the same output. Therefore, the spoke-type permanent magnet motor can be usefully applied to a washing machine driving motor, an electric vehicle driving motor, a small generator driving motor, etc. requiring high torque and high output characteristics. In the case of a spoke type permanent magnet motor, the permanent magnet inserted into the rotor is arranged in a spoke type. Recently, a double spoke type motor in which the permanent magnet of the spoke type permanent magnet motor is divided into two is used to increase the reluctance torque. .

In order to manufacture a motor, it is necessary to magnetize a permanent magnet disposed inside the rotor.

1 schematically illustrates a magnetizing device of a double spoke motor capable of being magnetized once.

As shown in FIG. 1, a conventional double spoke magnetizing device capable of magnetizing once includes a yoke 10 forming an accommodation space therein and a plurality of teeth 11 formed on an inner circumferential surface of the yoke 10, The rotor of the double spoke motor is accommodated in the accommodating space formed by the yoke 10 . Two permanent magnets 21 are disposed per pole in the rotor, and the rotor shown in FIG. 1 has a total of 8 poles. The space between the permanent magnets 21 of one adjacent pole is called the pole piece 22, and the teeth 11 are disposed at the part where the pole piece 22 is located, and a total of eight teeth 11 are formed. A coil 12 is wound around (11) to generate magnetic flux toward the permanent magnet 21, thereby magnetizing the permanent magnet 21.

FIG. 2 shows the degree of magnetization and magnetic flux when the permanent magnet 21 is magnetized using the same type of magnetizing device as in FIG. 1 .

In FIG. 2, the red part of the permanent magnet is a magnetized part, and the blue part is a non-magnetized part. As shown in FIG. There were problems such as not being sufficiently magnetized and affecting the performance of the motor. This is due to the fact that as many teeth 11 as the number of pole pieces 22 are formed in the conventional magnetizing device, magnetic flux saturation occurs and the magnetic flux is sufficiently transmitted to the inside of the permanent magnet. because it doesn't In order to solve this problem, as shown in FIG. 3, a magnetizing device of a double spoke motor capable of magnetizing four times is schematically shown.

As shown in FIG. 3, the permanent magnet magnetizing device of the conventional four-time magnetized double spoke motor has fewer teeth 11 than the conventional magnetizing device of the double spoke motor capable of magnetizing once shown in FIG. The number of permanent magnets formed and magnetized in one magnetization is two. In this case, only two permanent magnets 21 can be magnetized at a time, which lengthens the work process, and due to the problem of the magnetic flux path, the pair of permanent magnets 21 and the central part of the rotor are less magnetized. There may be problems.

The above problems also appear in the permanent magnet magnetizing device of the twice magnetized double spoke motor shown in FIG. 4 .

Korean Patent Registration No. 10-2272599 (“Magnetizing Device and Method”, Publication Date 2021.07.02.)

The present invention has been made to solve the above problems, and an object of the magnetizing device of a double spoke type rotor according to the present invention is to improve magnetizing efficiency in magnetizing permanent magnets of a double spoke type rotor. It is to provide a magnetizing device that can be.

A magnetizing device for a double spoke type rotor according to the present invention for solving the above technical problem relates to a magnetizing device for magnetizing a permanent magnet of a double spoke type rotor, a yoke including a receiving space, the yoke A first tooth group formed on one side of the inner circumferential surface of the yoke and composed of three teeth spaced apart from each other, a second tooth group formed on the other side of the inner circumferential surface of the yoke and composed of three teeth spaced apart from each other, and a coil wound around the teeth Including, wherein each of the first tooth group and the second tooth group includes two outer teeth located on the outermost side and a central tooth located in the middle of the two outer teeth, and a permanent magnet is inserted into the receiving space The rotor core is disposed, and an outer end of the outer tooth is positioned on an outer circumferential surface of a central core positioned between a pair of permanent magnets constituting one pole.

In addition, an outer end of the outer tooth may be located at an end of an outer circumferential surface of the central core, far from the central tooth.

In addition, it is characterized in that it further comprises a gap formed between the outer teeth of each of the first tooth group and the second tooth group.

In addition, a distance between the gait pole and the outer circumferential surface of the rotor core may be the same as a distance between the outer teeth or the central teeth and the outer circumferential surface of the rotor core.

In addition, a distance between the gait pole and the outer circumferential surface of the rotor core may be greater than a distance between the outer teeth or the central teeth and the outer circumferential surface of the rotor core.

In addition, the auxiliary pole is characterized in that it is located on a pole piece between two adjacent poles of the outer circumferential surface of the rotor core.

In addition, the central tooth is characterized in that it is located on a pole piece between two adjacent poles of the outer circumferential surface of the rotor core.

In addition, the inner end of the outer tooth is characterized in that it is located at the inner end of the outer circumferential surface of the pole piece between two adjacent poles among the outer circumferential surfaces of the rotor core.

만큼 회전 방향으로 연장되어 형성되고, 상기 외측 티스는

만큼 회전 방향으로 연장되어 형성되며, 상기

는 상기

에 1.18~1.52를 곱 한 값을 가지는 것을 특징으로 한다.In addition, the central tooth

It is formed extending in the rotation direction by as much as, and the outer tooth is

It is formed by extending in the direction of rotation by as much as

said

It is characterized in that it has a value multiplied by 1.18 to 1.52.

According to the magnetizing device of the double spoke type rotor according to various embodiments of the present invention as described above, the outer end of the outer tooth is located in the central core between a pair of permanent magnets forming one pole, so that a stronger magnetic flux (or Many lines of magnetic force) can pass through the permanent magnet to be magnetized so that magnetization can be made to the inside of the permanent magnet to be magnetized, and permanent magnets constituting 4 poles can be magnetized more effectively and permanently when magnetized once. It has the effect of magnetizing a magnet.

In addition, according to the present invention, the outer end of the outer tooth is located at the outer end of the central core, so that stronger magnetic flux (or more lines of magnetic force) can pass through the permanent magnet to be magnetized, thereby improving the magnetization efficiency.

In addition, according to the present invention, there is an effect of improving the magnetization efficiency by subtracting the demagnetization flux to the permanent magnet other than the permanent magnet to be magnetized through the interpole.

In addition, according to the present invention, there is an effect that the magnetization efficiency can be further improved by adjusting the distance between the interpole and the rotor core to adjust the size of the demagnetizing magnetic flux subtracted through the interpole.

1 is a schematic diagram of a magnetizing device of a double spoke motor capable of being magnetized once;
FIG. 2 shows the degree of magnetization and magnetic flux when the permanent magnet 21 is magnetized using the same type of magnetizing device as in FIG.
3 is a schematic diagram of a permanent magnet magnetization device of a conventional four-time magnetized double spoke motor;
It is a schematic diagram of the permanent magnet magnetization device of the double magnetized double spoke motor shown in FIG.
5 is a schematic diagram of a magnetizing device for a double spoke type rotor according to a first embodiment of the present invention;
Figure 6 is a partially enlarged view of Figure 5,
7 is a schematic diagram of a magnetizing device for a double spoke type rotor according to a second embodiment of the present invention;
Figure 8 is a partially enlarged view of Figure 7,
9 is a comparison graph of magnetic flux strength by position of the conventional magnetizing device shown in FIG. 4 and the magnetizing device of the double spoke type rotor according to the second embodiment of the present invention shown in FIG. 7;
10 is a schematic diagram of a magnetizing device for a double spoke type rotor according to a third embodiment of the present invention;
FIG. 11 is a position of a magnetizing device for a double spoke type rotor according to a second embodiment of the present invention shown in FIG. 7 and a magnetizing device for a double spoke type rotor according to a third embodiment of the present invention shown in FIG. 10 It is a comparison graph of star magnetic flux strength,
12 is a schematic diagram of a magnetizing device for a double spoke type rotor according to a fourth embodiment of the present invention.

Hereinafter, a magnetizing device for a double spoke type rotor according to various embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[First Embodiment]

5 is a schematic diagram of a magnetizing device for a double spoke type rotor according to a first embodiment of the present invention.

As shown in FIG. 5, the magnetizing device of a double spoke type rotor according to the first embodiment of the present invention relates to a magnetizing device for magnetizing permanent magnets of a double spoke type rotor, and includes a yoke 10, It may include a 1 tooth group 110, a 2nd tooth group 120, and a coil 12.

The yoke 10 is made of a soft magnetic material and includes a receiving space therein. The rotor core 20 in which permanent magnets are disposed is disposed in the accommodation space. Double spoke type permanent magnets 21 are disposed in the rotor core 20 . In this embodiment shown in FIG. 5, the rotor core 20 has 8 poles, and two permanent magnets 21 are disposed on each pole. However, in the present invention, the number of poles of the rotor cores 20 to be magnetized is not limited to 8, and rotor cores of 6 or more poles may be magnetized. However, since the present invention can magnetize permanent magnets constituting 4 poles when magnetized once, the preferred number of poles of the rotor core 20 is 6 poles or more, but may be a multiple of 4. (For example, 8 poles, 12 poles, 16 poles...)

The first tooth group 110 and the second tooth group 120 are formed on one side and the other side of the inner circumferential surface of the receiving space formed in the yoke 10, respectively, and each tooth group consists of three teeth spaced apart from each other. The teeth included in the first tooth group 110 and the second tooth group 120 are members for forming a magnetic flux path, and may be formed of the same material as the yoke 10 . Since the first tooth group 110 and the second tooth group 120 are configured to correspond to each other, only the first tooth group 110 will be described, replacing the description of the second tooth group 120.

The three teeth included in the first tooth group 110 are referred to as a first outer tooth 112, a central tooth 111, and a second outer tooth 113 in order, respectively. At this time, the position of the central tooth 111 is located in the pole piece 22, which is the space between the permanent magnets forming two adjacent poles, among the outer circumferential surfaces of the rotor core 20, and the first outer teeth 112 and the second The outer teeth 113 may also be positioned adjacent to the adjacent pole piece 22 . That is, in the present invention, each tooth has a corresponding pole piece 22.

Coil 12 is wound on all teeth. A relatively large current flows through the coil 12 to form magnetic flux, and the magnetic flux formed by the coil 12, the yoke 10, and the teeth magnetizes the permanent magnets 21.

FIG. 6 is a partially enlarged view of FIG. 5 , showing both ends of the first outer teeth 112 in an enlarged manner.

As shown in FIG. 6, in this embodiment, the outer end of the first outer tooth 112 is a pair of permanent magnets 21 forming the closest adjacent one pole among a pair of permanent magnets 21 forming eight poles. Located between the permanent magnets (21). Here, the outer end of the first outer tooth 112 means an end far from the central tooth 111 .

As shown in FIGS. 5 and 6 , a space into which the permanent magnet 21 is inserted is formed in the rotor core 20 . The space into which the permanent magnets 21 are inserted is connected to the outside, and among the rotor core 20, a portion between a pair of permanent magnets 21 constituting one pole is called a central core 23. In this embodiment, the outer end of the first outer tooth 112 is positioned on the outer circumferential surface of the central core 23, and the second outer tooth 113 is also the same.

As described above, in the magnetizing device of the double spoke type rotor according to the first embodiment of the present invention, the outer ends of each of the first outer teeth 112 and the second outer teeth 113 are adjacent to each other of the central core 23. Located on the outer circumferential surface, unlike the conventional first outer teeth 112 and second outer teeth 113 simply located on the pole piece 22, stronger magnetic flux (or many lines of magnetic force) penetrate the central core 23 By passing through the permanent magnet 21 to be magnetized, it is possible to prevent the inner portion of the permanent magnet 21 to be magnetized (in the direction of the center of the rotor core 20) from being less magnetized. In this embodiment, the permanent magnets 21 to be magnetized include the permanent magnets 21 located between the first outer teeth 112 and the center teeth 111, and the second outer teeth 113 and the center teeth ( 111) is a permanent magnet 21 located between. In the present embodiment shown in FIGS. 5 and 6, the rotor core 20 has 8 poles, and a total of 4 permanent magnets are magnetized when magnetized once. (8 in total) Therefore, this embodiment In , it is possible to magnetize permanent magnets of all poles, 8 poles, by magnetizing a total of 2 times.

In this embodiment, the inner ends of the first outer teeth 112 and the second outer teeth 113 are at the inner ends of the outer circumferential surface of the pole piece 22 between two adjacent poles among the outer circumferential surfaces of the rotor core 20 can be located Here, the inner ends of the first outer teeth 112 and the second outer teeth 113 mean the ends closer to the central tooth 111 among the ends of both sides of each tooth.

[Second Embodiment]

7 is a schematic diagram of a magnetizing device for a double spoke type rotor according to a second embodiment of the present invention, and FIG. 8 is a partially enlarged view of FIG. 7 .

As shown in FIGS. 7 and 8, the magnetizing device of the double spoke type rotor according to the second embodiment of the present invention is the magnetizing device of the double spoke type rotor according to the first embodiment of the present invention described above. , The outer ends of the first outer teeth 112 and the second outer teeth 113 may be positioned to coincide with the ends farthest from the center teeth 111 of the outer circumferential surface of the central core 23 . This is to allow more strong magnetic flux (or more lines of magnetic force) to pass through the central core 23 to the target permanent magnet 21 to be magnetized.

만큼 회전 방향으로 연장되어 형성되고, 제1외측 티스(112) 및 제2외측 티스(113) 각각이

만큼 회전 방향으로 연장되어 형성된다고 했을 때,

는 상기

에 1.18~1.52를 곱한 값을 가질 수 있다. 상기한

와

과의 관계는 본 실시예에만 국한되지 않고, 앞서 설명한 본 발명의 제1실시예를 포함한 다양한 실시예에 적용될 수 있다.In this embodiment, the central teeth 111 are based on the centers of the yoke 10 and the rotor core 20.

It is formed by extending in the rotation direction by as much as, and each of the first outer teeth 112 and the second outer teeth 113

When it is formed extending in the direction of rotation by as much as

said

may have a value multiplied by 1.18 to 1.52. above

and

The relationship is not limited to the present embodiment, and may be applied to various embodiments including the first embodiment of the present invention described above.

FIG. 9 is a comparison graph of magnetic flux strength by position of the conventional magnetizing device shown in FIG. 4 and the magnetizing device of the double spoke type rotor according to the second embodiment of the present invention shown in FIG. 7 .

In FIG. 9, Model A refers to the conventional model shown in FIG. 4, and Model B refers to the magnetizing device of the double spoke type rotor according to the second embodiment of the present invention shown in FIG. 7, and FIGS. Each 3 o'clock direction in FIG. 7 is 0 degrees, and it is based on counterclockwise rotation. As shown in FIG. 9 , it can be seen that Model B, which is the present embodiment, has a greater magnetic flux intensity for each position than Model A, which is a conventional magnetizing device.

[Third and Fourth Embodiments]

10 is a schematic diagram of a magnetizing device for a double spoke type rotor according to a third embodiment of the present invention.

The magnetizing device of the double spoke type rotor according to the third embodiment of the present invention shown in FIG. 10 is the magnetizing device of the double spoke type rotor according to the second embodiment of the present invention described above. (200) may be further included.

The gap 200 extends inwardly from the yoke 10 and may be formed between the outer teeth of the first tooth group 110 and the second tooth group 120, respectively. Accordingly, a total of two electrodes 200 may be formed, and a separate coil is not wound around the electrodes 200 . The auxiliary pole 200 is located on the pole piece 22 between two adjacent poles of the outer circumferential surface of the rotor core 20 .

In the case of anisotropic magnetization such as a spoke-type magnetizer, the magnitude of magnetized magnetic flux is vector decomposed and magnetized by the magnitude in the direction in which the permanent magnets are anisotropically arranged. In the case of the first embodiment and the second embodiment of the present invention without the gap electrode 200, the magnetic flux is bent in the reverse direction, and therefore, one of the inner parts of the permanent magnet 21 adjacent to the permanent magnet to be magnetized is demagnetized ( demagnetization) occurs. The additional electrode 200 subtracts such demagnetizing magnetic flux, and can prevent the demagnetizing magnetic flux from being applied to the permanent magnets 21 other than the permanent magnets 21 to be magnetized.

FIG. 11 is a position of a magnetizing device for a double spoke type rotor according to a second embodiment of the present invention shown in FIG. 7 and a magnetizing device for a double spoke type rotor according to a third embodiment of the present invention shown in FIG. 10 This is a comparison graph of star magnetic flux strength.

In FIG. 11, Model A is the third embodiment of the present invention shown in FIG. 10, and Model B is the second embodiment of the present invention shown in FIG. and is based on a counterclockwise rotation. Here, the angular range in which the permanent magnet, which becomes the conventional demagnetization, is located is about 120 degrees to 200 degrees, and it can be seen that Model A, which is the present embodiment, has a larger magnetic flux in the corresponding section.

In this embodiment shown in FIG. 10, the distance between the strobe 200 and the outer circumferential surface of the rotor core 20 is the first outer teeth 112, the second outer teeth 113, or the central teeth 111 and the rotor It is the same as the distance between the outer circumferential surfaces of the core 20 . However, the present invention is not limited to the distance between the walking pole 200 and the outer circumferential surface of the rotor core 20, and the distance between the walking pole 200 and the outer circumferential surface of the rotor core 20 is the first outer tooth ( 112), there may also be embodiments smaller than the distance between the second outer teeth 113 or the center teeth 111 and the outer circumferential surface of the rotor core 20, which is shown in FIG. 12 in the fourth embodiment of the present invention It can be confirmed by the schematic diagram of the magnetizing device of the double spoke type rotor. In this case, the length at which the strut 200 extends may be shorter than that of the outer teeth or the central teeth 111 . Adjusting the distance between the interpole 200 and the outer circumferential surface of the rotor core 20 through the length of the interpole 200 is to control the magnetic demagnetization flux. As the distance between the gap pole 200 and the outer circumferential surface of the rotor core 20 is equal to the distance between the teeth and the outer circumferential surface of the rotor core 20, the demagnetizing magnetic flux that escapes through the gap pole 200 increases, but the magnetic flux decreases. As the distance between the interpole 200 and the outer circumferential surface of the rotor core 20 is different from the distance between the teeth and the outer circumferential surface of the rotor core 20, the demagnetizing magnetic flux exiting through the interpole 200 decreases, but the magnetic flux increases. do. That is, the user can adjust the degree of magnetization of the permanent magnet 21 by adjusting the length of the strobe 200 as needed.

The present invention is not limited to the above embodiments, and the scope of application is diverse, and various modifications and implementations are possible without departing from the gist of the present invention claimed in the claims.

10 : York
11 : Teeth
12: Coil
20: rotor core
21: permanent magnet
22 : Pole Peace
23: central core
110: 1st Teeth Army
111: center teeth
112: first outer tooth
113: second outer tooth
120: 2nd tooth group
200: Bogeuk

Claims (9)

It relates to a magnetizing device for magnetizing a permanent magnet of a double spoke type rotor,
A yoke containing an accommodation space;
a first tooth group formed on one side of an inner circumferential surface of the yoke and composed of three teeth spaced apart from each other;
a second tooth group formed on the other side of the inner circumferential surface of the yoke and composed of three teeth spaced apart from each other; and
a coil wound around the teeth;
Including,
Each of the first tooth group and the second tooth group includes two outer teeth located on the outermost side and a central tooth located in the middle of the two outer teeth,
The rotor core into which the permanent magnet is inserted is disposed in the accommodation space,
The magnetizing device of a double spoke type rotor, characterized in that the outer end of the outer tooth is located on the outer circumferential surface of the central core located between a pair of permanent magnets forming one pole.
According to claim 1,
The outer end of the outer tooth,
Magnetizing device of a double spoke type rotor, characterized in that located at the end of the outer circumferential surface of the central core, on the side far from the central tooth.
According to claim 1,
gaps formed between outer teeth of each of the first and second tooth groups;
Magnetizing device of a double spoke type rotor, characterized in that it further comprises.
According to claim 3,
The magnetizing device of a double spoke type rotor, characterized in that the distance between the step pole and the outer circumferential surface of the rotor core is the same as the distance between the outer teeth or the center teeth and the outer circumferential surface of the rotor core.
According to claim 3,
The magnetizing device of a double spoke type rotor, characterized in that the gap between the step pole and the outer circumferential surface of the rotor core is larger than the gap between the outer teeth or the center teeth and the outer circumferential surface of the rotor core.
According to claim 3,
The magnetizing device of a double spoke type rotor, characterized in that the pole piece is located on a pole piece between two adjacent poles of the outer circumferential surface of the rotor core.
According to claim 1,
The magnetizing device of a double spoke type rotor, characterized in that the central tooth is located on a pole piece between two adjacent poles of the outer circumferential surface of the rotor core.
According to claim 1,
The inner end of the outer tooth is located at the inner end of the outer circumferential surface of the pole piece between two adjacent poles, among the outer circumferential surfaces of the rotor core.
According to claim 1,
The center teeth

It is formed extending in the direction of rotation by as much as
The outer teeth

It is formed by extending in the direction of rotation by as much as
remind

said

Magnetizing device of a double spoke type rotor, characterized in that it has a value multiplied by 1.18 to 1.52.

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