KR20080022981A - Axial gap type motor and manufacturing method of the same - Google Patents

Abstract

An axial gap type motor and a manufacturing method of the same are provided easily to be wound by winding a stator coil around a stator core and exactly and stably to fix a location of the stator coil by coupling the stator coil on a back yoke through the stator core. An axial gap type motor includes a stator(100) and a rotor(20) to face each other along an axial direction of the rotor. The stator includes a back yoke(11), a stator core(113), and stator coils(12). The back yoke forms a magnetic path. The plural stator core, made of a magnetic material, is installed on an upper part of the back yoke in a circumferential direction. The stator coils are wound around the stator core with respect to a center in parallel with a rotation axis(30).

Description

Axial gap type motor and manufacturing method of the same

1 is a cross-sectional view showing a conventional axial gap motor;

2 is a perspective view showing a stator of an axial gap motor according to the present invention;

3 is a cross-sectional view showing an axial gap motor according to the present invention.

<Explanation of symbols for the main parts of the drawings>

10, 100: stator 10: back yoke

12 stator coil 13 mold part

20: rotor 21: permanent magnet

22: permanent magnet frame 30: rotation axis

40: bushing 51: lower bracket

61, 62: bearing 70: Hall sensor

113: stator core 114: insulator

The present invention relates to an axial gap motor in which the stator and the rotor are provided to face each other along the rotation axis direction, and more particularly, to an axial gap motor that is easy to manufacture and increases efficiency.

In the axial gap type motor, a gap between the stator and the rotor is formed in the radial direction, whereas such a gap is formed in the rotational axis direction. For example, in the case of the inner rotor type motor, the rotor is provided in the radially inner side of the stator, but in the case of the axial gap motor, the rotor is provided in the upper or upper portion of the stator. Since the axial gap type motor has an advantage of being thin, it is used as a driving motor for compact home appliances or FD drives.

A conventional axial gap motor will be described in detail with reference to FIG. 1.

As shown in FIG. 1, the stator 10 includes a back yoke 11 made of a magnetic material and a stator coil 12 positioned above the back yoke. The stator coils 12 are wound around a predetermined position in the radial direction of the back yoke 11, and a plurality of stator coils are provided along the circumferential direction of the back yoke, so that one stator coil is one magnetic pole. Will form.

That is, in the case of a three-phase six-pole axial gap BLDC motor, six stator coils are provided, and two stator coils corresponding to each of the six stator coils are formed.

On the other hand, the rotor 20 is positioned with a predetermined gap along the axial direction with respect to the stator 10. The rotor includes a permanent magnet 21 provided to face the stator coil 12. The permanent magnet is attached to the permanent magnet frame, and a plurality of permanent magnets are provided along the circumferential direction of the permanent magnet frame 22.

The rotation shaft 30 is rotated by the rotation shaft 30 penetrating and fixed to the center portion of the permanent magnet frame, and the rotor shaft 30 including the permanent magnet frame 22 and the permanent magnet 21 is rotated. Done. Here, the rotation shaft 30 is fixed to the permanent magnet frame 22 through the bushing (40).

Meanwhile, the axial gap motor may include a bracket for accommodating the stator 10 and the rotor 20, and the bracket includes an upper bracket (not shown) and a lower bracket 51.

The stator is fixed to the lower bracket 51, and the rotor 20 is in the upper bracket and the lower bracket through a bearing 61 installed on the lower bracket and a bearing 62 installed on the upper bracket. It is rotatably supported.

Reference numeral 70 is a Hall sensor for detecting the position / speed of the rotor.

As shown in FIG. 1, a method of manufacturing a conventional axial gap motor is as follows.

First, after the stator coils are formed, the stator coils 12 are positioned at predetermined intervals on the back yoke 11. In addition, the molding part 13 is molded to surround all of the stator coils 12 by molding the stator coils. The stator coil 12 is fixed on the back yoke 11 through the molding part 13. Then, the stator coil 12 is insulated through the molding part 13.

In the conventional method of manufacturing an axial gap motor, the manufacturing method is complicated because the stator coil must be separately formed. In addition, it is difficult to position the stator coils at predetermined intervals on the back yoke, and it is also very difficult to mold the stator coils by molding. This is because, in the axial gap motor, the stator coil is formed in a substantially planar shape, and thus it is very difficult to mold on the back yoke while maintaining the stator coil formed earlier.

In addition, the axial gap motor manufactured by the manufacturing method has a problem in that the efficiency due to leakage of magnetic flux inside the stator coil is reduced because there is no stator core to which the stator coil is wound.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide an axial gap motor that is easy to manufacture. In addition, another object of the present invention is to provide an axial gap motor with improved efficiency by minimizing magnetic flux leakage.

In order to solve the above technical problem, the present invention, the stator and the rotor is provided in the axial gap motor which is provided to face each other along the direction of the rotation axis of the rotor, the stator, the back yoke; A plurality of stator cores provided in a circumferential direction above the back yoke; And to the stator core provides an axial gap-type motor comprising a stator core wound around a center parallel to each of the rotation axis.

Here, the stator core is coupled on the back yoke. This coupling method may be implemented in various ways, and the stator core may be inserted into a groove formed on the back yoke and coupled. In addition, the stator core may be coupled onto the back yoke through a screw passing through the center of the stator core. Of course, it is also possible for the stator core to be coupled onto the back yoke in parallel with a groove and a screw.

Here, after the stator coil is wound around the stator core, the stator core is preferably coupled onto the back yoke. Of course, it is also possible that the stator core is first wound onto the back yoke and then the stator coil is wound directly.

On the other hand, the stator core is preferably formed by compressing the fiber-reinforced thermosetting compound and such materials are known in the chemical or chemical engineering field as BMC or SMC. These materials are excellent in formability and can be fabricated into various shapes, and are formed to have strong magnetic characteristics.

In addition, the stator core may be formed of a magnetic plastic. Such materials are also excellent in formability, and because they are magnetic in themselves, they can minimize leakage of magnetic flux through them.

An insulator is interposed between the stator core and the stator coils.

Here, the front end of the stator core is preferably formed in a flat shape of a fan shape in which the center is cut. That is, when all of the stator cores are coupled to the back yoke, the shape of the stator cores forms an annular plate shape. And the longitudinal section of the center of the stator core is preferably a 'T' shape.

In order to solve the above technical problem, the present invention also comprises the steps of forming a plurality of stator cores; Winding stator coils around each of the stator cores in a rotation axis direction; And it provides a method of manufacturing an axial gap-type motor comprising the step of coupling the stator cores at predetermined angle intervals along the circumferential direction on the back yoke.

Here, the stator core is formed by compressing the fiber reinforced thermosetting compound. Of course, the stator core may be formed by injecting magnetic plastic.

According to the present invention described above it is possible to provide an axial gap-type motor is easy to manufacture and the efficiency is improved by preventing the leakage of magnetic flux due to the stator core.

Hereinafter, an axial gap motor according to the present invention will be described in detail with reference to FIGS. 2 to 3. The same components as in the related art are designated by the same reference numerals, and detailed description thereof will be omitted.

2 is a perspective view showing a stator 100 of an axial gap motor according to the present invention.

As shown in FIG. 2, the stator 100 of the axial gap motor according to the present invention includes a back yoke 11, a stator core 113, and a stator coil 12. In addition, an insulator such as interphase paper 114 is formed to insulate the stator coil 12 from the back yoke 11 and the stator core 113.

Of course, the function of the interphase paper may be replaced by a bobbin (not shown) made of an insulating material. In this case, after the stator coil 12 is wound around the bobbin, the stator core 113 is inserted into the bobbin. The bobbin has sidewalls formed at both sides of the central part of the stator coil to be wound to insulate the stator coil 12, the back yoke 11, and the stator core 113, respectively, through the sidewalls. Such bobbin or phase paper is a general matter in the motor field, and thus detailed description thereof will be omitted.

Meanwhile, as shown in FIG. 3, the stator core 113 is formed separately from the back yoke 11 and coupled to the back yoke. The coupling method of the stator core 113 and the back yoke 11 may be implemented in various ways.

For example, the groove 111 is formed on the back yoke 11 so that the stator core 113 is inserted into the groove 111 so that the stator core 113 is coupled to the back yoke 11. It is possible to be.

Although not shown, the stator core may be coupled to the back yoke through a screw (not shown) through the center of the stator core at the top of the stator core 113. Of course, the stator core 113 may be coupled to the back yoke 11 in parallel with the groove 111 and the screw.

For reference, in FIG. 3, an interphase paper between the stator core 113 and the stator coil 12 is omitted.

As shown in Figure 2 and 3, the cross-sectional shape of the stator core 113 is preferably made of 'T' type. That is, it may include a body portion 123 to which the stator coil is wound and a flat portion 133 forming one end portion of the body portion.

Here, one side of the body portion 123 is coupled to the back yoke 11 and fixed through the groove 111 and the like. And, the other side of the body portion 123 is connected to the flat portion 133.

The shape of the planar portion 133 constituting the front end of the stator core 113 may be formed in a fan shape having a center cut out, as shown in FIG. 2. As shown in FIG. 2, the planar portion 133 is preferably formed to cover all of the stator coils 12. 3 shows a form in which only a part of the stator coil 12 is covered.

On the other hand, when all of the stator core 113 is coupled to the back yoke 11, as shown in FIG. 2, the planar portions 133 of the stator core form an annular shape. Therefore, since the planar portion 133 of the stator core forms a magnetic path, the efficiency of the magnetic flux generated by the stator coil 12 may be prevented and the efficiency may be increased.

Here, the stator core 113 is preferably formed of a magnetic material. In other words, the stator coil is wound, and in order to minimize magnetic flux leakage by forming a magnetic path formed inside the stator core as well as a function as a configuration for supporting the stator coil.

In a conventional motor, a stator core is generally formed. The stator core is formed by stacking tin steel sheets. However, it is very difficult to variously form the stator core using such tin steel sheet.

Therefore, the axial gap motor according to the present invention comprises a stator core 113, the stator core can be molded by compressing the fiber-reinforced thermosetting compound. Such fiber reinforced thermosetting compounds are known as BMC or SMC and are very moldable. And it can be formed to have a stronger magnetic than to form by stacking a general tin steel sheet. Therefore, it is possible to provide an axial gap type motor that improves efficiency by minimizing leakage of magnetic flux formed at the center of the stator coil 12 through the stator core 113.

Similarly, since the stator core 113 has a flat portion 133, the magnetic flux leakage in the flat portion is also minimized to increase efficiency. That is, according to the present invention, the waste path is substantially formed, thereby minimizing the leakage of magnetic flux, thereby maximizing the efficiency of the motor.

Meanwhile, the stator core 113 may be formed of magnetic plastic. Likewise, the magnetic plastic has very good moldability. This is because it is easy to injection-mould the magnetic particles having a magnetic material into plastic. It is therefore possible to form stator cores of complex shape. Such magnetic plastics are magnetic materials and plastics at the same time. In addition, since the magnetic plastic is an insulating material, there is no need to separately insulate between the stator coil 12 and the stator core 113 using interphase paper or the like.

Hereinafter, a method of manufacturing an axial gap motor according to the present invention, in particular, a method of manufacturing a stator of an axial gap motor according to the present invention will be described in detail.

First, a stator core is formed. The stator core is formed of a magnetic material as described above. Preferably, the stator core may be molded by compressing a fiber-reinforced thermosetting compound, or may be molded by injection of a magnetic plastic.

Then, a stator coil is wound around the stator core. The winding direction of the stator coil is the same direction as the center of the rotation shaft.

Thereafter, the stator cores on which the stator coils are wound are coupled onto the back yoke at an angle along the circumferential direction of the back yoke. In this coupling method, the stator core may be inserted into a groove formed on the back yoke, or the coupling may be performed using a screw or the like.

Therefore, according to the method of manufacturing an axial gap motor according to the present invention, since the stator coil is wound around the stator core, the winding is very easy and the stator coil is easily fixed.

As described above, according to the present invention, there is an effect of providing an axial gap-type motor having improved efficiency by minimizing magnetic flux leakage in the stator coil and the upper part of the stator coil due to the stator core made of a magnetic material.

In addition, since the stator coil is wound around the stator core, the winding is easy, and since the stator coil is coupled onto the back yoke through the stator core, the stator coil can be accurately positioned and provide a stable gap gap motor.

In addition, since there is no need to form a separate mold for fixing and insulating the stator coil, it is possible to provide an easy axial gap motor.

Claims (10)

In the axial gap motor, the stator and the rotor are provided to face each other along the direction of the rotation axis of the rotor, The stator, A back yoke to form a jar; A stator core having a plurality of magnetic materials provided in a circumferential direction above the back yoke; And And an stator core wound around the stator core about a center parallel to the rotation axis. The method of claim 1, The stator core is an axial gap motor, characterized in that formed of a magnetic plastic of insulating material. The method of claim 2, And the stator core is coupled on the back yoke. The method of claim 3, wherein And the stator core is inserted into and coupled to a groove formed on the back yoke. The method of claim 3, wherein The stator core is coupled onto the back yoke through a screw passing through the center of the stator core. The method of claim 3, wherein And the stator core is coupled onto the back yoke after the stator coil is wound around the stator core. The method of claim 6, The front end of the stator core is an axial gap-type motor, characterized in that formed in a flat plane of the shape of the center cut. The method of claim 6, An longitudinal gap motor, characterized in that the longitudinal section of the center of the stator core has a 'T' shape. Forming a plurality of stator cores from a magnetic material; Winding stator coils around each of the stator cores in a rotation axis direction; And coupling the stator cores at predetermined angular intervals along the circumferential direction on the back yoke. The method of claim 10, And the stator core is made of magnetic plastic.

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