KR20210050844A - Motor assembly - Google Patents

Abstract

Various embodiments disclosed herein are intended to reduce the overall weight of the motor assembly, secure a space inside the motor assembly, and provide a motor assembly to which an improved coupling structure for coupling each component is applied.

Description

Motor assembly {MOTOR ASSEMBLY}

Various embodiments of the present invention relate to a motor assembly having an improved assembly structure.

A general motor is a device that implements a driving force by the interaction between the stator and the rotor, and basically the overall structure of the stator and the rotor is the same.

However, the types of motors are divided according to the principle in which the rotor rotates due to the interaction between the stator and the rotor. In addition, the type of motor is divided according to the type or phase of power applied to the stator coil. In addition, the types of motors are also classified according to how the stator coil is wound. For example, there are a DC type variable voltage motor and an AC type three-phase induction motor.

In the general structure of the motor, a shaft forming a rotating shaft, a rotor coupled to the shaft, and a stator fixed inside the housing are provided, and the stators are installed at predetermined intervals along the circumference of the rotor.

In addition, the stator is provided with a tooth so that a coil forming a rotating magnetic field is wound on the tooth to induce electrical interaction with the rotor to induce rotation of the rotor.

The coil is divided into concentrated winding and distributed winding according to the winding method, and the concentrated winding is a winding method in which the coil is concentrated in one slot, and the distributed winding is divided into two or more slots. It is a winding method.

In the case of concentrated zone, copper wire (Copper loss) can be reduced while reducing the amount of winding compared to the distribution zone, but the change in magnetic flux density is large because the coil is excessively concentrated in the slot. Power loss increases. For this reason, coils wound in a concentrated winding method are generally used in small motors.

In recent years, motors used in various home appliances (eg, hair dryers, vacuum cleaners, etc.) have been developed in various ways to secure assembly, securing flow path area, and solving spatial constraints that occur in response to demand for miniaturization and performance improvement. It is being done.

Looking at the prior patent (GB2495547B, published on April 17, 2013), the prior literature discloses a BLDC motor including a 4-pole permanent magnet rotor and a 4-pole stator arm, but the rotor and stator of this structure is applied only to single-phase drive. As a result, it is difficult to arbitrarily designate the rotation direction, and it is not suitable for small motors used in home appliances because the torque ripple is relatively large compared to the multi-phase drive, which generates a lot of vibration and noise. In addition, prior patents are posted on windings and magnetic flux, but not on specific structures.

Patent document: GB2495547B (published on April 17, 2013)

Accordingly, one of the various problems disclosed in the present specification is to provide a motor assembly with an improved assembly structure capable of solving the spatial constraints that may occur due to the miniaturization of the motor.

One of the various problems of the present specification is to provide a structure capable of reducing the weight of the motor and securing a space inside the motor by independently configuring a stator core.

One of the various problems of the present specification is to provide a structure in which an insulator surrounding an independent stator core is coupled to a motor housing, thereby securing a space inside the motor and improving the assembling property and robustness of the motor.

One of the various problems of the present specification is to provide a structure capable of eliminating the existing press-in process by applying and combining a screw wire structure to a shroud and a motor housing, and preventing a decrease in fastening force due to rotation of the impeller.

One of the various problems of the present specification is to provide a structure in which the diffuser is fitted inside the motor housing without the need for a component for connecting the diffuser and the motor housing.

Various embodiments for solving various problems of the present specification provide a motor assembly including a core forming each phase independently to reduce the weight of the motor and secure a space inside the motor.

An exemplary embodiment of the present specification provides a hole in a motor housing for fixing an independently configured core, and an uneven structure of a core insulator fitted in the hole.

An exemplary embodiment of the present specification provides a structure in which a plurality of stator cores are fixed to a side wall of a motor housing, and a bearing coupled with a shaft is fixed to the motor housing.

An exemplary embodiment of the present specification provides a structure capable of minimizing bolting when fixing each part of a motor assembly.

An exemplary embodiment of the present specification includes at least a portion of a shaft forming a rotation shaft of a motor, a rotor coupled to the shaft to form magnetism, a stator core forming a magnetic path by being spaced apart from the rotor by a predetermined gap, and an outer circumferential surface of the stator core. And a motor housing in which a space for accommodating the motor is formed, and an insulator in which a coil is wound around and the insulator is formed, and the insulator is fixed to the motor housing.

Preferably, the motor housing includes a first groove formed on an inner wall of the motor housing, and the insulator may include a fixing portion inserted into the first groove, and the first groove is the motor housing It is formed along the longitudinal direction of the rotation shaft on the inner wall of the insulator, and the insulator is inserted into the motor housing in the longitudinal direction of the rotation shaft, and the fixing part is guided and fitted along the first groove in the longitudinal direction of the rotation shaft. .

Meanwhile, the stator core may be provided with a plurality of stator cores along the circumference of the rotor, and the plurality of stator cores may be provided to be independently spaced apart from each other, and the stator core may include two It may include two pole arms and a connection portion connecting the pole arms.

The insulator includes a winding portion forming a gap in which the connection portion is inserted, a section in which the coil is wound, and a fixing portion extending from the winding portion toward an outer radial direction of the shaft, and the motor housing A first groove is formed on the inner wall, the fixing part can be inserted into the first groove, the fixing part is provided with at least two, and the fixing part extends from both sides of the winding part toward the outer side in the radial direction of the shaft. Can be.

In addition, the fixing part may extend outward in the radial direction of the shaft, and may be elastically deformed and inserted into the first groove.

An exemplary embodiment of the present specification includes a shaft forming a rotation shaft of a motor, an impeller coupled to the shaft, a diffuser provided between the impeller and the motor, and a motor housing in which a space for accommodating the motor is formed, The diffuser includes a support portion extending in a direction of a rotation axis of the shaft, and the motor housing includes a second groove in an inner wall into which the support portion is inserted.

Preferably surrounding the outer circumference of the impeller, the air inlet is formed, further comprises a shroud coupled to the motor housing, the motor housing is formed with a screw thread along the outer circumference, the shroud , The screw wire is coupled to the motor housing, and the screw wire may be formed in the same direction as the rotation direction of the impeller.

On the other hand, the second groove is formed in the inner wall of the motor housing along the longitudinal direction of the rotation shaft, the diffuser is inserted into the shaft in the longitudinal direction of the rotation shaft, and the support part, the rotation shaft in the second groove It can be fitted by being guided in the longitudinal direction of.

Each of the features of the above-described embodiments may be implemented in combination in other embodiments, unless contradictory or exclusive with other embodiments.

According to various embodiments disclosed herein, a space inside the motor assembly may be secured to secure a space for flow of air capable of cooling the heat generated by the motor. In other words, performance improvement can be expected by minimizing heat generation in a small high-speed motor.

By simplifying the various coupling structures for coupling the motor assembly, the space inside the motor can be secured, the process erasing effect and the assembling property of the motor assembly can be improved.

By improving the structure of each component of the motor assembly, it is possible to secure an organic connection between each component and a fastening force between each component.

1 is a perspective view of a cleaner according to an embodiment of the present specification.
2 is a perspective view of a motor assembly according to an embodiment of the present specification.
Figure 3 is an exploded view of Figure 2;
Figure 4 is an enlarged view of the part of Figure 2;
5 is a view showing a coupling portion between the insulator and the motor housing.
6 is a top cross-sectional view of the motor assembly.
7 is a top cross-sectional perspective view of the motor assembly.
8 is an exploded perspective view of the motor assembly.
9 is a view showing a coupling portion between the diffuser and the motor housing.

Hereinafter, a specific embodiment of the present invention will be described with reference to the drawings. The following detailed description is provided to aid in a comprehensive understanding of the methods, devices, and/or systems described herein. However, this is only an example and the present invention is not limited thereto.

In describing the embodiments of the present invention, when it is determined that a detailed description of a known technology related to the present invention may unnecessarily obscure the subject matter of the present invention, a detailed description thereof will be omitted. In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to the intention or custom of users or operators. Therefore, the definition should be made based on the contents throughout the present specification. The terms used in the detailed description are only for describing embodiments of the present invention, and should not be limiting. Unless explicitly used otherwise, expressions in the singular form include the meaning of the plural form. In this description, expressions such as "comprising" or "feature" are intended to indicate certain features, numbers, steps, actions, elements, some or combination thereof, and one or more It should not be construed to exclude the presence or possibility of other features, numbers, steps, actions, elements, any part or combination thereof.

In addition, in describing the constituent elements of the embodiment of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are for distinguishing the constituent element from other constituent elements, and the nature, order, or order of the constituent element is not limited by the term.

1 is a perspective view of a cleaner according to an embodiment of the present specification. Hereinafter, it will be described with reference to FIG. 1.

Referring to Fig. 1, the vacuum cleaner includes a cleaner body 1 having a motor for generating a suction force, a suction nozzle 6 for sucking air containing dust, and the cleaner body 1 and the suction nozzle 6. It may include an extension pipe (5) to connect.

Meanwhile, although not shown, the suction nozzle 6 may be directly connected to the cleaner body 1 without the extension pipe 5.

The cleaner body 1 may include a dust bin 2 in which dust separated from air is stored. Accordingly, dust introduced through the suction nozzle 6 may be stored in the dust bin 2 through the extension pipe 5.

The cleaner body 1 may be provided with a handle 3 for gripping by a user. The user can perform cleaning while holding the handle 3.

The cleaner body 1 may be provided with a battery (not shown), and the cleaner body 1 may be provided with a battery accommodating part 4 in which the battery (not shown) is accommodated. The battery accommodating part 4 may be provided under the handle 3. The battery (not shown) may be connected to the suction nozzle 6 to supply power to the suction nozzle 6.

Hereinafter, the motor assembly described in the present specification means that it can be applied to the vacuum cleaner as described above, but is not necessarily applied to the vacuum cleaner described above, and can be applied to various products in which a small motor is used.

2 is a perspective view of a motor assembly according to an embodiment of the present specification, FIG. 3 is an exploded view of FIG. 2, and FIG. 4 is an enlarged view of a component of FIG. 2. Hereinafter, it will be described with reference to FIGS. 2 to 4.

The motor assembly 10 of this embodiment includes a shroud 11, an impeller 12, a diffuser 13, a shaft 14, a rotor 16, and a motor housing 17, and the motor 15 is As a configuration that rotates with respect to the rotation axis by receiving, in the case of the present embodiment, a shaft 14, a rotor 16, a stator core 153, and an insulator 151 may be included.

The insulator 151 is a configuration in which a coil (not shown) is wound around the stator core 153. In order to more clearly express the coupling structure of the motor assembly, the coil wound around the insulator 151 or the stator core 153 is Omit it.

It is exemplified that the motor 15 of this embodiment is a brushless direct current motor (BLDC). In this drawing, the back yoke of the stator is omitted as a BLDC motor, and a motor having a structure in which each stator core 153 is independently provided is shown.

Each stator core 153 is provided in a "C" shape to form each phase of a multiphase motor, and the virtual circumference formed by the stator core 153 shows a structure disposed outside the rotor 16, have.

That is, a plurality of stator cores 153 are provided along the circumference of the rotor 16, and the plurality of stator cores 153 are independently spaced apart from each other to form each phase of a multiphase motor.

In the case of a general motor, an annular back yoke is provided, and an inner type in which teeth extend radially inward from the back yoke or an outer type in which teeth extend radially outward from the back yoke. It is provided to help the back yoke to form the magnetic path of the motor. However, in this embodiment, as a structure applied to a high-speed, small-sized motor, each stator core is located at a relatively close distance, so the back yoke is omitted and each The magnetic path can be formed with only the stator core of.

Of course, an annular back yoke may be formed in a small motor to help form a magnetic path, but in the case of a high-speed, small motor, an air passage area for cooling heat generation must be secured. That is, increasing the cooling efficiency by securing the air passage area in a small high-speed motor is a task directly connected to the efficiency of the motor.

Therefore, rather than having more advantages in the formation of the magnetic path by the back yoke, the overall cooling efficiency of the motor is increased by removing the back yoke and securing the air passage area by forming each independent core as in this embodiment. The efficiency can be further increased. The shape of the stator core and the structure of the insulator will be described later in more detail with reference to FIG. 4.

In the motor housing 17, a space for accommodating the motor 15 is formed, and the motor 15 is provided in the space. The motor housing 17 may be provided in a cylindrical shape for efficient use of space, and the shaft 14 may be positioned on a central axis of the motor housing 17. Because, since the rotor 16, the stator core 153, and the insulator 151 are located between the shaft 14 and the inner wall of the motor housing 17, the minimum space in which the components can be located is secured. At the same time, in order to reduce the size of the overall motor assembly 10, it is preferable that the motor housing 17 is provided in a cylindrical shape.

And the motor housing 17 is combined with the shroud 11 to form the exterior of the motor assembly 10, and a space in which the motor 15, the diffuser 13, and the impeller 12 are provided. . The internal space of the motor assembly 10 is communicated with the outside by a through part 1703 formed through the motor housing 17, and the through part 1703 discharges the internal heat of the motor 15 to the outside. I can make it. In addition, in the lower part of the motor housing 17, a through part penetrating through the motor housing 17 is formed in the rest of the parts except for a part to which structures such as a bearing (not shown) and a shaft 14 are fastened. Can be expected.

The shroud 11 surrounds the outer circumference of the impeller 12, has an inlet 111 through which air is introduced, and is coupled to the motor housing 17. The suction port 111 may be formed at the center side of the shroud 11 and may form a curved portion 113 based on the suction port 111.

In more detail, the inlet 111 of the shroud 11 may be formed in a circular shape, and the curved portion 113 may be formed so that the inner diameter thereof is expanded along the flow direction of the air with respect to the inlet 111. In addition, one end of the curved portion 113 is coupled to the motor housing 17, and in this embodiment, a screw line 1701 is formed along the upper circumference of the motor housing 17 to be coupled to the shroud 11. Are posting.

The screw wire 1701 may be formed in the same direction as the rotation direction of the impeller 12. In general, the screw wire is formed in a right-hand screw method and is rotated in a clockwise direction to release the connection to the screw wire, but in the case of this embodiment, the screw wire is formed in the same direction as the rotation direction of the impeller 12, so that the impeller 12 rotates. It is possible to prevent the reduction of the tightening force of the screw connection.

That is, when the impeller 12 rotates in a counterclockwise direction, the screw wire is processed in a left-hand screw method, and when the motor is driven at high speed by receiving a force in the direction in which the coupling is made by the rotation of the impeller 12, the shroud ( 11) It is possible to prevent a decrease in the fastening force between the motor housing 17 and the motor housing 17. Of course, when the rotation of the impeller 12 rotates in a clockwise direction, the thread may be processed by a right-hand screw method.

When the shroud 11 and the motor housing 17 are combined as described above, since it is not based on a separate structure such as a bolt, it is possible to simplify the process, reduce the weight of the motor assembly, and reduce the overall volume.

The impeller 12 is coupled to the shaft 14 and rotates to generate a flow of air, and a part of the impeller 12 is exposed to the outside of the motor assembly 10 by the suction port 111.

The impeller 12 generates a flow of air pressurized through the inlet 111, and the impeller 12 is provided between the diffuser 13 and the shroud 11 at the tip of the shaft 14. It may be coupled to, the shaft 14 is provided with a shaft hole 121 is inserted.

The shaft hole 121 is formed on the hub 123 that supports the overall rigidity of the impeller 12, and the hub 123 has a surface that inclines downward as it gradually moves away from the center of rotation in the radial direction, It may be a four-flow type impeller 12 provided with radial blades 125.

The diffuser 13 has a hole 131 formed in a central portion, the hub 123 is seated along the outer circumferential surface of the hole 131, and a cylindrical portion having an inner diameter corresponding to the outer diameter of the impeller 12 133 is formed, and a plurality of vanes 135 are provided along the outer circumferential surface of the cylindrical portion 133 to guide the flow of air pressurized and flowed by the impeller 12.

The outer diameter of the virtual circumference formed by the vanes 135 may correspond to the inner diameter of the side wall of the motor housing 17, and the correspondence between the inner diameter and the outer diameter of the cylindrical portion 133 is not only physical contact but also , Can be interpreted as a meaning including even a slight difference. That is, the overall structure of the motor assembly 10 can be assembled in a texture, and at the same time, the gap generated in each of the components is minimized to prevent the flow of air flowing along the vanes 135 from being dispersed. It is desirable.

The shaft 14 forms a rotation shaft r, and a rotor 16 that forms magnetism on the outer surface of the shaft 14 is coupled along the longitudinal direction of the shaft 14. The rotor 16 rotates by mutual electrical interaction between the stator core 153 and the coil wound around the insulator 151 so that the shaft 14 forms a rotation shaft r, Rotate.

Although not shown in the drawings, bearings may be provided on both sides or both ends of the shaft 14.

Referring to FIG. 4, the stator core 153 and the insulator 151 among the configurations of the motor 15 will be described below.

The stator core 153 is independently provided as described above, and the independently provided means that the plurality of stator cores 153 are physically separated, and at the same time, each phase of the multi-phase motor is independently formed. Means.

The stator core 153 may be provided close to a'C' shape including two pole arms 1533 extending toward the radially inner side of the shaft 14 and a connection part 1531 connecting the pole arms 1533. have.

The radially inner side of the shaft 14 may mean a direction toward the rotation axis r around an imaginary circle formed with respect to the rotation axis r of the shaft 14. That is, the radial inner side may be understood as a direction from the virtual circumference toward the rotation axis r, and the radial outer side may be understood as a direction from the rotation axis r toward the virtual circumference.

The insulator 151 is an insulator that insulates the stator core 153 and covers a part of the outer surface of the stator core 153 to directly contact the coil.

The insulator 151 of the present embodiment may be made of two separate parts 151a and 151b, and will be described as a first insulator 151a and a second insulator 151b, respectively. That is, the insulator may be manufactured as a single part, but for convenience of assembly, it may be manufactured as a divided part as in the present embodiment and assembled to the stator core.

The first insulator 151a may be provided to be fitted into the stator core 153 at one side of the stator core 153, and may be provided to surround approximately half of the stator core 153 and the second insulator ( The 151b may be provided to be fitted into the stator core 153 at the other side of the stator core 153, and may be provided to surround the other half of the stator core 153.

The first insulator 151a and the second insulator 151b may be bonded to a contact surface by a bonding method, but this is not necessarily the case, and various methods for combining each insulator may be adopted. .

After each of the insulators 151a and 151b are coupled to surround the stator core 153, a coil may be wound around the insulator 151.

In more detail, the insulator 151 forms a gap into which the connection part 1531 is inserted, and the winding part 1511 forming a section in which the coil is wound, and the outer side in the radial direction of the shaft 14 in the winding part 1511 It may include a fixing portion 1513 extending toward.

The winding part 1511 has an inner wall having a gap in contact with the connection part 1531 and into which the connection part 1531 is inserted, and the outer wall of the winding part 1511 is in contact with the coil and a section in which the coil is wound. Can be formed.

In addition, the fixing parts 1513 may extend from both sides of the connection part 1531 toward the outer side in the radial direction of the shaft 14, and the fixing part 1513 has a predetermined length greater than the diameter of the coil. It is preferable to extend while forming. This is because if the fixing part 1513 does not form a predetermined length, the coil may flow down when the coils are stacked and wound.

That is, the fixing part 1513 is not only configured to be coupled to the inner wall of the motor housing 14 as described later, but also prevents the coil from flowing down when the coils are stacked and wound.

When two of the fixing parts 1513 are respectively extended from both sides of the connection part 1511 as in this embodiment, the fixing parts 1513 will be kept spaced apart from each other by at least the length of the connection part 1511. . In this case, the fixing part 1513 may be elastically deformed, and the degree of the elastic deformation may be deformed within a distance of each fixing part.

As each of the fixing parts is elastically deformed, the fixing parts may be fixed to the inner wall of the motor housing 17 to be described later.

5 is a view showing a coupling portion between the insulator and the motor housing, FIG. 6 is an upper cross-sectional view of the motor assembly, and FIG. 7 is an upper cross-sectional perspective view of the motor assembly.

Hereinafter, a coupling structure between the insulator and the motor housing according to the present embodiment will be described with reference to FIGS. 5 to 7.

The fixing part 1513 of this embodiment extends radially outward of the shaft 14 from both sides of the winding part 1511, and the fixing part 1513 is fitted to the inner wall of the motor housing 17. to be.

In more detail, the motor housing 17 includes a first groove 171 formed in the inner wall 17a of the motor housing 17, and the depth of the first groove 171 is determined by the rigidity of the motor housing 17 and In consideration of the coupling with the fixing part 1513, it may be formed between the inner wall 17a and the outer wall 17b of the motor housing.

The first groove 171 may be formed along the longitudinal direction of the rotation shaft r on the inner wall of the motor housing 17, and the longitudinal direction of the rotation shaft r is parallel to the rotation shaft r, and the motor housing ( It can be understood as a direction corresponding to the height direction of 17).

Preferably, the first groove 171 corresponds to the height of the insulator 151 and may be bent from the inner wall 17a of the motor housing 17 toward the outer wall 17b. Therefore, the insulator 151 may be inserted into the motor housing 15 in the longitudinal direction of the rotation shaft r, and the fixing part 1513 is guided along the first groove 171 in the longitudinal direction of the rotation shaft r. It can be fitted to the inner wall of the motor housing 17.

The fixing part 1513 may be provided in a curved protruding shape at a tip side, and the first groove 171 may be provided corresponding to the shape of the fixing part 1513. However, the fixing part 1513 of this embodiment is not necessarily interpreted as being limited to this shape, and the shape of the fixing part 1513 and the first groove 171 includes various shapes for increasing the bonding force by increasing the contact area. Will be understood.

On the other hand, since the fixing parts 1513 are respectively extended from both sides of the winding part 1511 and each fixing part is spaced a predetermined distance, a plurality of the first grooves 171 are also provided on the inner wall of the motor housing 17. This is desirable.

The first grooves 171 may also be formed in pairs along the inner wall of the motor housing 17 to be provided at a predetermined interval. This is because in the case of a multi-phase motor, a plurality of stator cores forming each phase are provided, and the stator cores are provided at predetermined intervals along the outer circumference of the rotor 16.

In the case of this embodiment, three stator cores are provided, and each stator core forms U, V, W phases, so it is preferable to be spaced apart at 120 degree intervals along the outer circumference of the rotor 16. Accordingly, three insulators surrounding the stator core may be provided, and six fixing portions 1513 extending from each insulator may be provided. In addition, 6 first grooves 171 may be formed on the inner wall of the motor housing 17, and since the two first grooves fix one insulator, each pair of two first grooves forms a pair of 120 degrees apart. As a result, it may be formed on the inner wall of the motor housing 17.

The distance between the two first grooves 171 coupled to the fixing portions 1513 extending from each of the insulators 151 is formed smaller than the distance between the fixing portions 1513 and spaced apart from each other to form a press fit tolerance. I can.

In other words, the fixing part 1513 is elastically deformed in its position and fitted into the first groove 171 and fitted into the first groove 171 by the restoring force of the fixing part 1513, so that the insulator ( The coupling force between the 151 and the motor housing 17 may be increased.

Of course, in order to further increase the bonding force, an adhesive may be applied to the outer surface or the first groove 171 of the fixing part 1513 to fix each other.

As in the present embodiment, the stator core 153 forming each phase is formed by a fixing portion 1513 of the insulator 151 and a first groove 171 formed in the inner wall of the motor housing 17. Can be fixed to Accordingly, a separate structure for fixing the stator core 153 can be minimized, and a portion that can act as resistance to the flow of air can be minimized by securing an internal space of the motor assembly.

As described above, compared to a method in which the stator core is generally attached to a structure formed on the shaft or fastened as a separate structure using the thickness direction of the back yoke, this embodiment uses an independent “c”-shaped core. By removing the back yoke, the motor assembly was aimed at reducing the overall weight and size of the motor assembly, and by fixing the stator core to the inner wall of the motor housing through the improvement of the structure of the insulator, it is possible to secure a space inside the motor assembly.

8 is an exploded perspective view of the motor assembly, and FIG. 9 is a view showing a coupling portion between the diffuser and the motor housing.

Hereinafter, the previously described parts with reference to FIGS. 8 and 9 will be omitted, and the coupling structure of the shroud and the motor housing of the present embodiment will be described.

The shroud 11 of the present embodiment may have a threaded line 139 formed on the inner surface thereof, and the threaded line 139 is fitted with the threaded line 1701 of the motor housing 17, so that the shroud 11 and the The motor housing 17 may be coupled.

As described above, the screw wires 1701 and 139 are processed in the same direction as the rotation direction of the impeller 12 to prevent a decrease in the fastening force between the motor housing 17 and the shroud 11 due to the rotation of the impeller 12 can do.

In addition, by removing the separate bolt structures for coupling through the above structure, it is possible to expect lighter weight, miniaturization, and ease of manufacture of the motor.

The diffuser 13 may include a support part 137 extending in the direction of the rotational axis r of the shaft 14, and the support part 137 is a second groove 173 formed in the inner wall of the motor housing 17. ), it is possible to fix the diffuser 13.

In more detail, in the case of a small, high-speed motor as in this embodiment, the diffuser 13 may vibrate due to high-speed rotation of the impeller 12, and when the diffuser 13 vibrates, not only noise is generated, but also the overall durability of the motor assembly. Can be reduced.

In this embodiment, the support part 137 is inserted into the second groove 173 of the motor housing 17 to fix the circumferential movement of the diffuser 13, and preferably the support part 137 and the second groove It may be possible to fix the position of the diffuser 13 by applying an adhesive between the 173 and fixing it.

Looking at the structure of the support part 137 and the second groove 173 in more detail, the support part 137 may extend under the outer circumference of the diffuser 13. As described above, since the circumference of the vane 135 provided along the outer circumference of the cylindrical part 133 may be formed to correspond to the inner diameter of the motor housing 17, the support part 137 is the cylindrical part 133 It may be located in a virtual circumference formed by the vane 135 in the lower portion of the, and preferably may be formed in contact with the imaginary circumference.

In addition, since the vane 135 forms a flow path for air, when the support part 137 is positioned within a virtual circumference formed by the vane 135, it may act as resistance to the flow of air. Therefore, the support part 137 is in contact with the vane 135 and is preferably located under the diffuser 13.

That is, since a flow path through which air is guided is formed between the vanes 135 and the vanes 135, it is preferable not to invade the space between the vanes 135 and the vanes 135. However, the support part 137 is a structure for fixing the movement or vibration of the diffuser 13 in the circumferential direction as described above, and may be formed to be thicker than the thickness of the vane 135 when considering rigidity. It is desirable to minimize the protrusion in the space between the vanes and the vanes by being located at the bottom of (135).

The second groove 173 may be formed along the longitudinal direction of the rotation shaft r on the inner wall of the motor housing 17 to correspond to the extended length of the support part 137. Therefore, the diffuser 13 is inserted into the shaft 14 in the direction of the rotation axis r when assembling, and the support part 137 is guided and fitted in the second groove 173 in the longitudinal direction of the rotation axis r. I can.

According to the present embodiment described above, a separate structure for coupling the motor assembly 10 can be minimized. In more detail, the stator core 153 may be fixed to the inner wall of the motor housing 17 by the improved structure of the insulator 151, and the improved structure of the insulator 151 allows the stator core 153 to be attached to the motor housing. In addition to fixing it to (17), it is also possible to prevent the coil from flowing down when the coil is laminated.

And by inserting the support part 137 of the diffuser 13 into the second groove 173 formed in the inner wall of the motor housing 17, the position of the diffuser 13 may be fixed, and the shroud 11 It is possible to prevent a reduction in tightening force that may occur when the motor is driven through the screw connection with the motor housing 17.

That is, the motor assembly 10 according to the present embodiment can improve the coupling structure of each component as a whole to reduce the size and weight of the motor and secure an internal space, and at the same time, it is possible to prevent a decrease in fastening force even when the motor is driven at a high speed.

Although the exemplary embodiments of the present invention have been described in detail above, those of ordinary skill in the art to which the present invention pertains will understand that various modifications can be made to the above-described embodiments without departing from the scope of the present invention. . Therefore, the scope of the present invention is limited to the described embodiments and should not be determined, and should not be determined by the claims to be described later, but also by those equivalents to the claims.

10: motor assembly
11: Shroud
13: diffuser
14: shaft
15: motor
16: rotor
17: motor housing

Claims (15)

A shaft forming a rotational shaft of the motor;
A rotor coupled to the shaft to form a magnetism;
A stator core spaced apart from the rotor to form a magnetic path;
An insulator winding around at least a portion of an outer circumferential surface of the stator core and winding a coil; And
Includes; a motor housing in which a space accommodating the motor is formed,
The motor assembly, wherein the insulator is fixed to the motor housing. The method of claim 1,
The motor housing includes a first groove formed in an inner wall of the motor housing,
The insulator includes a fixing part inserted into the first groove. The method of claim 2,
The first groove is a motor assembly, characterized in that formed along the longitudinal direction of the rotation shaft in the inner wall of the motor housing. The method of claim 3,
The insulator is inserted into the motor housing in the longitudinal direction of the rotation shaft,
The motor assembly, characterized in that the fixing portion is fitted by being guided along the first groove in the longitudinal direction of the rotation shaft. The method of claim 1,
The stator core,
A plurality is provided along the circumference of the rotor,
The motor assembly, characterized in that the plurality of stator cores are provided to be independently spaced apart from each other. The method of claim 5,
The stator core,
Two pole arms extending radially inward of the shaft; And
A motor assembly comprising a; connecting portion connecting the pole arm. The method of claim 6,
The insulator,
A winding part forming a gap into which the connection part is inserted and forming a section in which the coil is wound; And
Including; a fixing portion extending from the winding portion toward the outer radial direction of the shaft,
A motor assembly, wherein a first groove is formed in an inner wall of the motor housing, and the fixing part is inserted into the first groove. The method of claim 7,
At least two or more of the fixing parts are provided,
The motor assembly, wherein the fixing portion extends from both sides of the winding portion toward the outer side in the radial direction of the shaft. The method of claim 2,
The fixing part is a motor assembly, characterized in that extending toward the outer side in the radial direction of the shaft, elastically deformed and inserted into the first groove. A shaft forming a rotational shaft of the motor;
An impeller coupled to the shaft;
A diffuser provided between the impeller and the motor; And
Includes; a motor housing in which a space accommodating the motor is formed,
The diffuser includes; a support part extending in a direction of a rotation axis of the shaft,
And a second groove in which the support part is inserted into an inner wall of the motor housing. The method of claim 10,
And a shroud surrounding the outer circumference of the impeller and having an intake port through which air is introduced, and coupled to the motor housing. The method of claim 11,
The motor housing is a motor assembly, characterized in that a screw line is formed along an outer circumference, and the shroud is coupled to the screw line to be coupled to the motor housing. The method of claim 12,
The screw wire, motor assembly, characterized in that formed in the same direction as the rotation direction of the impeller. The method of claim 10,
The second groove is a motor assembly, characterized in that formed along the longitudinal direction of the rotation shaft in the inner wall of the motor housing. The method of claim 14,
The diffuser is inserted into the shaft in the longitudinal direction of the rotation shaft,
The support part is a motor assembly, characterized in that the guide is fitted in the second groove in the longitudinal direction of the rotation shaft.

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