KR102452894B1 - Outer rotor type motor - Google Patents

Abstract

The present specification relates to an outer rotor type motor. The outer rotor type motor comprises: a rotor; a rotating shaft; a stator; and a coil. The rotor includes: a cylindrical heat dissipation frame; and a rotor core having a plurality of magnets fixed at constant intervals toward an inner center of the heat dissipation frame along the inner surface of the heat dissipation frame. The rotating shaft is connected to the rotor and transmits rotating force of the rotor. The stator allows the rotating shaft to pass through a penetrating hole formed in the center, and includes a stator core in which a plurality of teeth corresponding to the plurality of magnets are radially formed. The coil is wound on each of teeth. The each of teeth includes a hollow formed in a thickness direction. The present invention can reduce a weight of the outer rotor type motor.

Description

Outer rotor type motor {OUTER ROTOR TYPE MOTOR}

The present specification relates to an outer rotor type motor, and more particularly, to an outer rotor type motor and a manufacturing method thereof.

A motor is a device that generates power with electrical energy. Depending on the arrangement of the stator and rotor, an inner rotor type motor and an outer rotor type motor are used. type motor). The inner rotor type motor is a type in which a rotor is rotatably installed inside the stator, and the outer rotor type motor is a type in which the rotor is rotatably installed outside the stator.

Among the motors as described above, the outer rotor type motor is used in various fields such as, for example, a motor of a drone. In the case of an outer rotor type motor used in drones, the higher the cooling efficiency, the longer the battery usage time and lifespan, and the lighter the weight, the longer the battery usage time.

In general, an outer rotor type motor includes a rotor to which a plurality of magnets are attached at regular intervals on an inner circumferential surface of a cylindrical rotor core, a rotation shaft connected to the rotor to transmit the rotational force, and a position inside the rotor and a stator formed including a stator core having a plurality of teeth formed in a radial direction at positions corresponding to the plurality of magnets, and a coil wound around each of the plurality of teeth. A general shape of a rotor and a stator of such an outer rotor type motor is shown in FIG. 1 .

1 (a) shows a cross-section in which the rotor 10 and the stator 20 are cut in a direction perpendicular to the rotation axis in a state where the stator 20 is located inside the rotor 10, and FIG. 1 (b) is an enlarged view of part A of FIG. 1(a). Referring to FIG. 1( b ), grooves are formed at regular intervals on the inner surface of the cylindrical rotor core 11 , and the thin plate-shaped magnets 12 are inserted into the grooves and fixed. In the core back 21 of the stator 20, teeth 22 are formed in a radial direction at a position corresponding to each magnet 12, and a coil 23 is evenly arranged in each tooth 22 with a certain number of turns. is wound up.

However, when the above-described outer rotor type motor of FIG. 1 is used as a driving motor of a drone, heat is not rapidly discharged during operation due to the structural characteristics of the rotor and stator, and the weight is heavy, so the battery life and use time and There may be a problem that the lifespan is shortened. Laid-Open Patent Publication No. 2012-0134984 discloses an example of an outer rotor type motor having such a problem.

Korean Patent Publication No. 2012-0134984, 2012.12.12.

An object of the present specification is to provide an outer rotor type motor capable of rapidly dissipating heat generated from the rotor of the motor to increase the performance of the motor and extend the life and use time of the battery in order to solve the above problems do it with

In addition, an object of the present specification is to provide an outer rotor type motor capable of extending the use time of a battery by reducing the weight of the stator of the motor.

In addition, an object of the present specification is to provide an outer rotor type motor capable of improving smooth driving and vibration noise by removing the branching phenomenon.

In addition, an object of the present specification is to provide an outer rotor type motor capable of high efficiency and high torque operation by reducing leakage and repulsive magnetic force of a magnetic force line by increasing the number of windings of a coil of a stator tooth.

The problems to be solved by the present invention are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

The present specification presents an outer rotor type motor. The outer rotor type motor includes: a rotor including a cylindrical heat dissipation frame and a rotor core having a plurality of magnets fixed at regular intervals toward the inner center of the heat dissipation frame along an inner circumferential surface of the heat dissipation frame; a rotation shaft connected to the rotor to transmit a rotational force of the rotor; a stator including a stator core through which the rotation shaft passes through a through hole formed in the center thereof and having a plurality of teeth corresponding to the plurality of magnets formed in a radial direction; and a coil wound on each of the plurality of teeth, wherein each of the plurality of teeth may include a hollow formed in a thickness direction thereof.

The outer rotor type motor and other embodiments may include the following features.

According to an embodiment, the stator core is configured by stacking at least one core plate, and the core plate includes a ring-shaped unit core back and a plurality of unit teeth protruding from an outer circumferential surface of the unit core back in a radial direction. is formed, and the unit tooth may have a through hole penetrating therein along the longitudinal direction of the unit tooth.

According to an embodiment, the magnet has two protrusions extending outwardly from the center of the rotor core at both ends thereof, and the heat dissipation frame corresponds to the two protrusions of the magnet along its inner circumferential surface. Having a groove formed in a position, the protrusion may be inserted into the groove and fixed.

According to an embodiment, the core plate further includes a unit tooth extension formed by extending from one end of the unit teeth in the circumferential direction of the core plate, and the outer peripheral surface of the unit tooth extension is defined by the center of the stator as the center of the circle. is formed to be positioned on a first circle having a radius from the center of the stator to the outer circumferential surface of the unit tooth extension, and a surface of the magnet opposite the unit tooth extension is the center of the stator with the center of the circle and may be formed to be positioned on a second circle having a radius from the center of the stator to the surface of the magnet.

According to an embodiment, the coil may be wound such that the number of turns of the outer portion among at least two portions in the longitudinal direction of the tooth is greater than the number of windings of the inner portion of the tooth.

In some embodiments, the core plate may be formed by cutting a thin silicon plate.

Meanwhile, the present specification provides a method for manufacturing a stator of an outer rotor type motor. At least one of a ring-shaped core back, a plurality of teeth formed to protrude in a radial direction from an outer circumferential surface of the core back, and a tooth extension formed to extend in the circumferential direction of the core back from one end of the teeth; A method of manufacturing a stator from a core plate, the method comprising: preparing the silicon thin plate; preparing the at least one core plate by cutting the thin silicon plate so that a through hole is formed in each of the plurality of teeth in the thickness direction; stacking the at least one core plate in which the through hole is formed; and winding a coil on the plurality of stacked teeth.

The stator manufacturing method and other embodiments of the outer rotor type motor may include the following features.

According to an embodiment, the winding of the coil may include dividing the stacked plurality of teeth into at least two parts in an extension direction of the teeth; and winding the coil so that the number of windings of the portion located outside the at least two portions is greater than the number of windings of the portion located inside the at least two portions.

According to an embodiment, the winding of the coil so that the number of turns of the part located outside of the at least two parts is greater than the number of windings of the part located inside the at least two parts may include: dividing into 1st to 3rd parts; winding a first coil around the first to third parts with a first predetermined number of turns; winding a second coil with a second predetermined number of turns around the second to third portions on the first coil; and winding the third coil on the second coil with a third predetermined number of turns.

On the other hand, the motor of the outer rotor type disclosed herein may be configured to include a stator manufactured by the above-described stator manufacturing method.

The outer rotor type motor according to the embodiment disclosed in the present specification has the effect of rapidly dissipating heat generated from the rotor of the motor to increase the performance of the motor and extend the life and use time of the battery.

In addition, the outer rotor type motor according to the embodiment disclosed in the present specification has the effect of extending the battery usage time by reducing the weight of the stator of the motor.

In addition, the outer rotor type motor according to the embodiment disclosed in the present specification has an effect of improving smooth driving and vibration noise by removing the branching phenomenon.

In addition, the outer rotor type motor according to the embodiment disclosed in the present specification has the effect of enabling high efficiency and high torque operation by reducing leakage and repulsive magnetic force of magnetic force lines by increasing the number of windings of the coils of the stator teeth.

On the other hand, the effects obtainable in the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those of ordinary skill in the art to which the present invention belongs from the description below. will be able

The following drawings attached to the present specification illustrate preferred embodiments of the present invention, and serve to further understand the technical spirit of the present invention together with specific details for carrying out the invention, so the present invention is described in the drawings It should not be construed as being limited only to the matters.
1 shows a rotor and a stator of an outer rotor type motor in a general form.
2 is a perspective view of an outer rotor type motor according to an embodiment of the present invention.
3 is an exploded perspective view of an outer rotor type motor according to an embodiment of the present invention.
4 shows a configuration of a rotor core of an outer rotor type motor according to an embodiment of the present invention.
5 shows a configuration of a stator core of an outer rotor type motor according to an embodiment of the present invention.
6 illustrates a rotor core and a stator core of an outer rotor type motor according to an embodiment of the present invention.
7 illustrates one tooth and a portion of a rotor core corresponding thereto according to an embodiment.
8 is a view illustrating a portion of one tooth and a portion of a rotor core corresponding thereto, according to an embodiment.
9 is a flowchart illustrating a method of manufacturing a stator of an outer rotor type motor according to an embodiment of the present invention.
10 is a flowchart illustrating in detail a method of winding the coil of FIG. 9 .
11 is a flowchart illustrating in detail a method of winding the coil of FIG. 10 .

The technology disclosed herein may be applied to an outer rotor type motor and a method for manufacturing the same. However, the technology disclosed in the present specification is not limited thereto, and may be applied to all devices and methods to which the technical idea of the technology may be applied.

It should be noted that the technical terms used in this specification are only used to describe specific embodiments, and are not intended to limit the spirit of the technology disclosed herein. In addition, the technical terms used in this specification should be interpreted in the meaning generally understood by those of ordinary skill in the art to which the technology disclosed in this specification belongs, unless otherwise defined in this specification. It should not be construed in an overly comprehensive sense or in an excessively narrow sense. In addition, when the technical term used in this specification is an erroneous technical term that does not accurately express the spirit of the technology disclosed in this specification, a technical term that can be correctly understood by those of ordinary skill in the art to which the technology disclosed in this specification belongs. should be understood and replaced with In addition, general terms used in this specification should be interpreted according to the definition in the dictionary or contextual context, and should not be interpreted in an excessively reduced meaning.

As used herein, terms including ordinal numbers such as first, second, etc. may be used to describe various elements, but the elements should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, a first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

Hereinafter, the embodiments disclosed in the present specification will be described in detail with reference to the accompanying drawings, but the same or similar components are assigned the same reference numerals regardless of reference numerals, and redundant description thereof will be omitted.

In addition, in describing the technology disclosed in this specification, if it is determined that a detailed description of a related known technology may obscure the gist of the technology disclosed in this specification, the detailed description thereof will be omitted. In addition, it should be noted that the accompanying drawings are only for easy understanding of the spirit of the technology disclosed in this specification, and should not be construed as limiting the spirit of the technology by the accompanying drawings.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a perspective view of an outer rotor type motor according to an embodiment of the present invention, and FIG. 3 is an exploded perspective view of an outer rotor type motor according to an embodiment of the present invention.

2 to 3, the outer rotor type motor 1000 disclosed in the present specification is connected to the outer rotor type rotor 100 and the rotor 100 to transmit the rotational force of the rotor. It may be configured to include a rotation shaft 200 and a stator 300 positioned inside the rotor 100 and through which the rotation shaft 200 passes through a through hole formed in the center thereof.

The rotor 100 may include a cylindrical rotor core 110 and a rotor frame 120 in which the rotor core 110 is fixed to an inner circumferential surface thereof and transmits the rotational force generated by the rotor core 110 . have.

The rotor core 110 includes a heat dissipation frame 111 having a cylindrical shape, and a plurality of magnets 112 fixed at regular intervals toward the inner center of the rotor core 110 along an inner circumferential surface of the heat dissipation frame 111 . It may be composed of

The rotor frame 120 also has a cylindrical shape, and the rotor core 110 is fixed to its inner circumferential surface, and is connected to the rotation shaft 200 through a plurality of connecting bridges 121, thereby transferring a rotational force to the rotation shaft ( 200) can be passed.

The plurality of magnets 112 are fixed at regular intervals toward the inner center of the rotor core 110 along the inner circumferential surface of the heat dissipation frame 111 .

The rotation shaft 200 is connected to the rotor frame 120 to receive rotational force from the rotor frame 120, and passes through a through hole formed through the middle of the stator 300 to the upper bearing ( 410) and the lower bearing 420, the sealing ring 430, and the washer 440 for fixing can be rotated stably by being fitted.

The stator 300 includes a stator core 310 having a plurality of teeth 312 formed in a radial direction and a coil 320 wound around the teeth 312 . can be

The stator core 310 is configured to include a cylindrical core back 311 and a plurality of teeth 312 protruding from an outer circumferential surface of the core back 311, and the plurality of teeth 312 is the rotor. A position corresponding to the plurality of magnets 112 provided in the core 110 may be formed in a radial direction from the outer circumferential surface of the core back 311 .

A hollow is formed in each of the plurality of teeth 312 in the thickness direction, so that the overall weight of the stator core 310 may be smaller than when there is no hollow. The hollow formed in the tooth 312 will be described in detail with reference to FIG. 5 below.

The stator 300 may be fixed to the motor fixing frame 400 and connected and fixed to a body such as a drone through this.

Figure 4 is a view showing the configuration of the rotor core of the motor of the outer rotor type according to an embodiment of the present invention, Figure 4 (a) is a plurality of magnets 112 are fixed to the inner peripheral surface of the heat dissipation frame 111 It is a view showing the rotor core 110, FIG. 4 (b) is a view showing only the heat dissipation frame 111 from which the magnet 112 is removed, and FIG. 4 (c) is a magnet as a state in which only the heat dissipation frame 111 is removed. It is a view showing only 112, and FIG. 4(d) is an enlarged view of a part of the rotor core 110 of FIG. 4(a).

Referring to FIG. 4 , groove portions 111-1 are formed on the inner circumferential surface of the heat dissipation frame 111 so that the magnet 112 can be inserted and fixed, and both ends of the magnet 112 have groove portions of the heat dissipation frame 111 . A protrusion 112-1 is formed so as to be inserted into the 111-1.

The protrusions 112-1 at both ends of the magnet 112 are formed to extend outward from the center of the rotor core 110 with respect to the center of the rotor core 110, so that the magnet 112 is formed. When viewed in the thickness direction of the rotor 100, it has the shape of the letter “c”.

Therefore, when the magnet 112 is adhered to and fixed to the heat dissipation frame 111, it can be fixed more firmly than a conventional magnet, and due to the protrusion 112-1 and the groove 111-1, , since the contact area between the magnet 112 and the heat dissipation frame 111 becomes wider, heat generated from the magnet 112 can be rapidly discharged through the heat dissipation frame 111 .

5 is a view showing the configuration of a stator core of an outer rotor type motor according to an embodiment of the present invention. 5(b) is a view showing a stator core 310 configured by stacking a plurality of core plates 310-1 of FIG. 5(a).

Referring to FIG. 5 , each core plate 310-1 constituting the stator core 310 is a ring-shaped unit core back 311-1, radially from the outer peripheral surface of the unit core back 311-1. A plurality of unit teeth 312-1 protruding and formed in a rectangular shape, and a unit tooth extension 313 - formed extending in the circumferential direction of the core plate 310-1 from one end of the unit teeth 312-1. 1) may be included. In order to reduce the weight of the core plate 310-1, a through-hole 314-1 (eg, a rectangle) is formed in the center of the unit tooth 312-1 by cutting the inside of the tooth to leave only the outer shape.

Accordingly, when a plurality of core plates 310-1 are laminated and joined, the stacked unit core back 311-1 forms a cylindrical core back 311, and the stacked unit teeth 312-1 are Teeth 312 of a protruding shape are formed on the outer circumferential surface of the core back 311, and the stacked unit tooth extension 313-1 forms a tooth extension 313 of one end of the tooth 312, and A hollow 314 may be formed in the teeth 312 due to the through holes 314 - 1 to form a stator core 310 as shown in FIG. 5B .

The shape of the core plate 310-1 may be formed by cutting, for example, laser cutting, a silicon steel sheet in the form of a thin plate.

6 is a view showing a rotor core and a stator core of an outer rotor type motor according to an embodiment of the present invention. A cross section of the rotor core 110 and the stator core 310 cut in a direction perpendicular to the rotation axis is shown, and FIG. 6(b) is an enlarged view of part B of FIG. 6(a). In the drawings, reference numbers are described, but configurations not described below are the same as those of the same reference numbers described above, and thus detailed description thereof will be omitted.

Referring to FIG. 6( a ), in the outer rotor type motor according to the embodiment of the present invention, the teeth of the stator core 310 are hollow in all teeth, unlike the teeth of the conventional general stator core, hollows are formed inside the teeth. Since the weight of the portion is reduced, it is possible to provide an outer rotor type motor that is lighter than the conventional one.

Again, referring to (b) of FIG. 1 , in the prior art, since the interval between the neighboring teeth 22 is narrower inside than outside (that is, as the tooth extension part 24 goes into the core back 21 ), Because of the narrowing), the teeth 22 had to be wound outside with a thickness of about half of the narrowest interval to prevent interference between neighboring coils 23 .

However, referring to FIG. 6( b ), the teeth 312 of the stator core 310 according to an embodiment of the present invention are wound from the inside to the outside of the teeth 312 along the longitudinal direction of the teeth 312 . By winding the coil 320 so that the number of turns increases, it is possible to provide a coil with a greater number of windings than in the prior art.

7 is a view showing one tooth and a portion of a rotor core corresponding thereto according to an embodiment, and although reference numerals are described in the drawings, configurations not described below are the same as those of the same reference numerals described above. Therefore, a detailed description thereof will be omitted.

Referring to FIG. 7 , in an embodiment, the coil 320 surrounding the teeth 312 may be configured by dividing the teeth 312 into three parts, and then changing the number of windings in each part. For example, in the tooth 312 divided into three parts, the coil is set so that the number of turns of the coil C1 is greater than the number of turns of the coil C2 and the number of turns of the coil C2 is greater than the number of turns of the coil C3. It can be wound ((number of turns in coil C1) < (number of turns in coil C2) < (number of turns in coil C3)). That is, although the coil is wound for each divided part, the coil may be wound so that the number of windings is greater in a wide area than in a narrow space between adjacent teeth. In another embodiment, first, in the tooth 312 divided into three parts, all three parts are wound with a first constant thickness (N1), and then, the remaining two parts except for the part located closest to the core back 311 are The core back 311 by winding (N2) the part to a second constant thickness, and finally winding (N3) the other part (that is, the part located farthest from the core back 311) to a third constant thickness (N3). ), the coil can be configured so that the number of turns in the part located farther than the part close to it is greater.

In the example of FIG. 7, the tooth 312 is divided into three parts to form a coil with three different winding numbers. , it is possible to configure a coil by winding so that the number of turns of the outer part is greater than that of the inner part of the tooth among the divided parts.

8 is a view illustrating a portion of one tooth and a portion of a rotor core corresponding thereto, according to an embodiment.

Referring to FIG. 8 , in the outer rotor type motor according to the embodiment of the present invention, the surface 112 - 2 facing the tooth extension 313 in the magnet 112 inserted and fixed in the heat dissipation frame 111 . The curvature of the two surfaces 112-2 and 313-2 is so that the distance between the tooth extension part 313 and the surface 313-2 facing the magnet 112 is always constant while the rotor rotates. can be determined For example, all surfaces 313 - 2 facing the magnet 112 in all the tooth extensions 313 constituting the stator have the center of the stator as the center of a circle, and the surface 313 at the center of the stator It is configured to be positioned on a first circle having a distance to -2) as a radius, and all surfaces 112-2 facing the tooth extension 313 in all magnets 112 constituting the rotor are the center of the stator. It may be configured to be positioned on a second circle with a radius of the distance from the center of the stator to the surface 112 - 2 as the center of the circle. That is, the first circle and the second circle are concentric circles in which the length of the radius is different by the distance between the two surfaces 112-2 and 313-2, and the tooth extension part 313 is formed on the first circle. The teeth 312 are configured so that the faces 313-2 are positioned, and the magnets 112 are configured so that the faces 112-2 of the magnet 112 are positioned on the second circle, so that when the rotor rotates, the Since the distance between the two surfaces 112-2 and 313-2 can always be constant, the magnetic force lines (a, b, c) generated between them are formed uniformly, so that the branching phenomenon is eliminated, and the smooth rotation of the rotor and Vibration improvement can be outlined.

The components shown in FIGS. 1 to 8 are not essential, so an outer rotor type motor having more or fewer components may be implemented.

Hereinafter, a method of manufacturing an outer rotor type motor and components thereof according to an embodiment of the present invention will be described with reference to FIGS. 9 to 11 .

9 is a flowchart illustrating a method of manufacturing a stator of an outer rotor type motor according to an embodiment of the present invention.

9 , the stator of the outer rotor type motor according to the embodiment of the present invention includes a ring-shaped core back, a plurality of teeth protruding in a radial direction from an outer circumferential surface of the core back, and the core at one end of the teeth. It includes a tooth extension formed extending in the circumferential direction of the bag, and is composed of at least one core plate made of a thin silicon plate, and the stator may be manufactured by a method including the following steps.

In the method, first, preparing a thin silicon plate (S900), cutting the thin silicon plate to form a through hole in each of the plurality of teeth in the thickness direction to prepare the at least one core plate (S910), the The step of stacking the at least one core plate having a through-hole formed therein (S920), and winding a coil on the plurality of stacked teeth (S930) may be included.

10 is a flowchart illustrating in detail a method ( S930 ) of winding the coil of FIG. 9 .

Referring to FIG. 10 , the winding of the coil ( S930 ) includes dividing the stacked plurality of teeth into at least two parts in a direction in which the teeth extend from the core back (longitudinal direction of the teeth) ( S1000 ). and winding the coil so that the number of windings of the portion located outside the at least two portions is greater than the number of windings of the portion located inside ( S1010 ).

Here, in the step of winding the coil ( S1010 ), the tooth may be divided into three parts and wound as shown in the sequence of FIG. 11 below. A detailed method will be described with reference to FIG. 11 .

11 is a flowchart illustrating in detail a method ( S1010 ) of winding the coil of FIG. 10 .

Referring to FIG. 11 , the winding of the coil ( S1010 ) includes dividing the stacked plurality of teeth into first to third portions in a direction in which the teeth extend from the core back (the longitudinal direction of the teeth). (S1100), winding a first coil with a first predetermined number of windings for the first to third portions (S1110), dividing the second to third portions on the first coil with a second predetermined number of windings Winding the second coil (S1120), and winding the third part on the secondary coil by a third predetermined number of windings (S1130) may be configured to be included.

Accordingly, the user can manufacture an outer rotor type motor having high efficiency and high torque while reducing weight, and extending battery usage time and lifespan according to the method of FIGS. 9 to 11 .

In the above description, the steps or operations S900 to S1130 may be further divided into additional steps or operations, or combined into fewer steps or operations, according to an embodiment of the present invention. In addition, some steps or operations may be omitted as necessary, and the order between the steps or operations may be switched.

As used herein, the term “unit” (eg, a control unit, etc.) may mean a unit including, for example, one or a combination of two or more of hardware, software, or firmware. The term “unit” may be used interchangeably with terms such as, for example, unit, logic, logical block, component, or circuit. A "part" may be a minimum unit of a component integrally formed or a part thereof. A “unit” may be a minimum unit or a part of performing one or more functions. “Part” may be implemented mechanically or electronically.

As used herein, the term “a” is defined as one or more than one. Also, the use of introductory phrases such as “at least one” and “one or more” in a claim includes introductory phrases such as “at least one” and “one or more” and an ambiguous phrase such as “a” in the same claim. The introduction of another claim element by the ambiguous phrase "an", even if there is any, shall be construed to mean limiting any particular claim containing the claim element so introduced, to an invention containing only one such element. shouldn't be

In this document, expressions such as “A or B” or “at least one of A and/or B” may include all possible combinations of items listed together.

Unless otherwise indicated, terms such as “first” and “second” are used to arbitrarily distinguish between the elements described by such terms. Accordingly, these terms are not necessarily intended to indicate a temporal or other priority of such elements, and the mere fact that certain measures are recited in different claims does not indicate that a combination of these measures cannot be used to advantage. . Accordingly, these terms are not necessarily intended to denote the temporal or other priorities of such elements. The mere fact that certain measures are cited in different claims does not indicate that a combination of these measures cannot be useful.

Also, in the description and claims, terms such as “front”, “back”, “top”, “top”, “bottom”, “bottom”, “above”, “below”, etc. have been used for descriptive purposes, although It is not necessarily used to describe a permanent relative position. It is understood that the terms so used are interchangeable under appropriate circumstances to enable the embodiments of the invention described herein to operate otherwise than, for example, as shown or otherwise described herein.

For simplicity and clarity of illustration, it will be understood that elements (elements) shown in the drawings are not necessarily drawn to scale. For example, the dimensions of some elements may be exaggerated relative to others for clarity. Further, where considered appropriate, reference numerals may be repeated among the figures to indicate corresponding or analogous elements.

The arrangement of components to achieve the same function is effectively “related” such that the desired function is achieved. Thus, any two components combined to achieve a particular functionality may be considered "related" to each other so that the desired function is achieved, regardless of structure or intervening component. Likewise, two components thus associated may be considered “operably connected” or “operably coupled” to each other to achieve a desired function.

Also, those skilled in the art will recognize that the boundaries between the functionality of the operations described above are illustrative only. A plurality of operations may be combined into a single operation, the single operation may be distributed into additional operations, and the operations may be executed at least partially overlapping in time. Also, alternative embodiments may include multiple instances of a particular operation, and the order of operations may be changed in various other embodiments. However, other modifications, variations and alternatives are also possible. Accordingly, the detailed description and drawings are to be regarded in an illustrative rather than a restrictive sense.

The phrase “may be X” indicates that condition X may be satisfied. This phrase also indicates that condition X may not be met. For example, a reference to a system that includes a particular component should also include a scenario in which the system does not contain the specific component. For example, a reference to a method that includes a particular action should also include a scenario in which the method does not include the particular component. As another example, however, references to a system configured to perform a specific action should also include scenarios in which the system is not configured to perform a specific action.

The terms “comprising,” “having,” “consisting of,” “consisting of, and “consisting essentially of are used interchangeably. For example, any method may include at least the acts contained in the drawings and/or the specification, and may include only the acts contained in the drawings and/or the specification. Alternatively, the word “comprising” does not exclude the presence of elements or acts recited in a claim.

A system, apparatus, or device referred to in this specification includes at least one hardware component.

In the above, a preferred embodiment of the technology of the present specification has been described with reference to the accompanying drawings. Here, the terms or words used in the present specification and claims should not be construed as being limited to conventional or dictionary meanings, but should be interpreted as meanings and concepts consistent with the technical spirit of the present invention. The scope of the present invention is not limited to the embodiments disclosed herein, and the present invention can be modified, changed, or improved in various forms within the scope of the spirit and claims of the present invention.

1000: outer rotor type motor
100: rotor 110: rotor core
111: heat dissipation frame 112: magnet
120: rotor frame 121: connecting bridge
200: axis of rotation
300: stator 310: stator core
311: core back 312: teeth
313: tooth extension 314: hollow
320: coil
400: motor fixed frame 410: upper bearing
420: lower bearing 430: ring for sealing
440: washer for fixing

Claims (10)

a rotor including a cylindrical heat dissipation frame and a rotor core having a plurality of magnets fixed at regular intervals toward the inner center of the heat dissipation frame along an inner circumferential surface of the heat dissipation frame;
a rotation shaft connected to the rotor to transmit the rotational force of the rotor;
a stator including a stator core through which the rotation shaft passes through a through hole formed in the center thereof and having a plurality of teeth corresponding to the plurality of magnets formed in a radial direction; and
Including a coil wound on each of the plurality of teeth,
Each of the plurality of teeth includes a hollow formed in the thickness direction by cutting the inside of the teeth in the longitudinal direction of the teeth,
The coil winds each of the plurality of teeth so as to surround the entire hollow inside the teeth,
The stator core is
At least one core plate is laminated,
The core plate is
It is formed including a ring-shaped unit core back and a plurality of unit teeth protruding in a radial direction from an outer circumferential surface of the unit core back,
The unit tooth is
A through hole is formed through the inside of the unit tooth in the longitudinal direction, and the through hole forms the hollow when the core plate is stacked,
The magnet is provided with two protrusions extending outwardly from the center of the rotor core at both ends thereof,
The heat dissipation frame has a groove formed at positions corresponding to the two protrusions of the magnet along its inner circumferential surface,
The protrusion is inserted into the groove and fixed
Outer rotor type motor, characterized in that. delete delete The method of claim 1,
The core plate further includes a unit tooth extension formed by extending from one end of the unit tooth in a circumferential direction of the core plate,
The outer peripheral surface of the unit tooth extension has the center of the stator as the center of the circle, and is formed to be positioned on a first circle having a radius from the center of the stator to the outer peripheral surface of the unit tooth extension,
The surface of the magnet opposite the unit tooth extension is formed to be positioned on a second circle having the center of the stator as the center of the circle and the distance from the center of the stator to the surface of the magnet as a radius
Outer rotor type motor, characterized in that. The method of claim 1, wherein the coil is
of at least two portions in the longitudinal direction of the teeth
It is wound so that the number of turns of the part located on the outside is greater than the number of turns of the part located on the inside.
Outer rotor type motor, characterized in that. According to claim 1, wherein the core plate is
Formed by cutting a thin silicon plate
Outer rotor type motor, characterized in that. delete delete delete delete

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