KR102777701B1 - Motor assembly - Google Patents

Abstract

The present invention relates to a motor assembly.
An exemplary embodiment of the present invention provides a motor assembly including a shaft forming a rotational axis of a motor, a rotor coupled to the shaft, end plates respectively provided on both sides of the rotor along an axial direction of the shaft, and a core provided along a circumference of the rotor to form a magnetic path, wherein the end plates include a support portion that contacts an end surface of the rotor and supports the rotor, and a protrusion portion that extends from the support portion along a longitudinal direction of the shaft, and wherein the protrusion portion forms a flow between the rotor and the core according to rotation of the shaft.

Description

MOTOR ASSEMBLY

The present invention relates to a motor assembly.

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

However, the types of motors are divided according to the principle of rotation of the rotor by the interaction between the stator and the rotor. Also, the types of motors are divided according to the type or phase of power applied to the stator coil. Also, the types of motors are divided according to the method by which the stator coil is wound. For example, there are DC variable voltage motors and AC three-phase induction motors.

The general structure of the above motor is explained as follows: a shaft forming a rotational axis, a rotor coupled to the shaft, and a stator core fixed to the inside of the housing are provided, and the stator is installed at a predetermined interval along the circumference of the rotor.

And the stator core is provided with teeth, and coils are wound around the teeth to form a rotating magnetic field, causing electrical interaction with the rotor to induce rotation of the rotor.

Depending on the winding method, coils are classified into concentrated winding and distributed winding. Concentrated winding is a winding method in which the coil is wound concentrated on one slot, while distributed winding is a winding method in which the coil is wound divided into two or more slots.

In the case of concentrated winding, the copper loss can be reduced by reducing the number of turns compared to distributed winding, but since the coils are excessively concentrated in the slot, the change in magnetic flux density is large, and the core loss (or iron loss), that is, the power loss of the iron core, increases. For this reason, coils wound in the concentrated winding method are generally used in small motors.

Recently, various developments are being carried out to solve problems such as securing assembly, securing the flow area, and spatial constraints that arise due to the demands for miniaturization and improved performance of motors used in various home appliances (e.g. hair dryers, vacuum cleaners, etc.).

The cited invention (10-2013-0034267, published on April 5, 2013) is a form in which a rotor core is manufactured with a salient pole structure for processing a cover blade portion. Therefore, since it is not a centrifugal rotor core, it does not have a uniform shape in the circumferential direction, and this may act as a factor preventing the generation of uniform magnetic force. In addition, since the rotational inertia is non-uniform, it may act as a vibration factor during operation.

In addition, since the cited invention has the blade portion positioned at the longitudinal center of the rotor core, only one location can be installed at the center due to the characteristics of the shape, so the heat dissipation effect is insufficient, and there is always a risk of assembly failure due to processing tolerance when in contact with the rotor core.

Therefore, the present invention aims to solve the above-described problem.

One of the various tasks of the present invention is to provide a motor assembly including an end plate having a structure capable of improving the heat dissipation effect of a rotor.

One of the various tasks of the present invention is to provide a motor assembly capable of increasing structural life by reducing the axial load of the rotor assembly.

One of the various tasks of the present invention is to provide a motor assembly including an end plate having a structure capable of offsetting an axial load caused by a rotating impeller.

Various embodiments for solving the problem of the present invention provide a motor assembly capable of forming a flow around a rotor through an end plate having a salient pole structure and dissipating heat from a rotor and a stator by the formed flow.

An exemplary embodiment of the present invention provides a motor assembly capable of maintaining equilibrium by forming a counterforce in the opposite direction to an axial load caused by an impeller of a rotor assembly through an end plate forming a fan-shaped pole structure.

An exemplary embodiment of the present invention provides a motor assembly including a shaft forming a rotational axis of a motor, a rotor coupled to the shaft, end plates respectively provided on both sides of the rotor along an axial direction of the shaft, and a core provided along a circumference of the rotor to form a magnetic path, wherein the end plates include a support portion that contacts an end surface of the rotor and supports the rotor, and a protrusion portion that extends from the support portion along a longitudinal direction of the shaft, and wherein the protrusion portion forms a flow between the rotor and the core according to rotation of the shaft.

The above protrusion is formed within the radius of the rotor, and the protrusion extends from the support while forming a predetermined inclination angle. In addition, the protrusion can extend while forming an inclination angle in either a left-hand thread direction or a right-hand thread direction based on the rotational direction of the shaft.

Meanwhile, an exemplary embodiment of the present invention further includes an impeller installed on the shaft and rotating, and the end plate may include a first end plate provided between the impeller and one surface of the rotor and a second end plate provided on the other surface of the rotor. A protrusion of the first end plate may be symmetrical with respect to a protrusion of the second end plate with respect to the rotor.

The protrusion of the first end plate and the protrusion of the second end plate can extend from each support member while forming a predetermined inclination angle.

An exemplary embodiment of the present invention provides a motor assembly including a shaft forming a rotational axis of a motor, a rotor coupled to the shaft, an impeller coupled to the shaft at a predetermined distance from the rotor, a diffuser provided between the impeller and the rotor, a shroud accommodating the impeller and the diffuser and forming an intake portion through which outside air is introduced, end plates respectively provided on both sides of the rotor along the axial direction of the shaft, and a core provided along the circumference of the rotor to form a magnetic path, wherein the end plates include a support portion that contacts an end surface of the rotor and supports the rotor, and a protrusion portion that extends from the support portion along the longitudinal direction of the shaft, wherein a flow moving in a first direction from the intake portion along the impeller and the diffuser according to the rotation of the shaft, and a flow formed in a second direction opposite to the first direction between the rotor and the core are provided.

The above diffuser may include a diffuser body connected to the shaft and a plurality of vanes extending radially outwardly from an outer surface of the diffuser body of the shaft.

The above impeller may include an impeller body connected to the shaft and a plurality of blades extending radially outwardly from an outer surface of the impeller body, and the impeller body may be provided with a shape in which a circumference increases from one end surface to the other end surface along the longitudinal direction of the shaft.

The above diffuser body may be formed so that the circumference of one end surface is the same as or larger than the circumference of the other end surface of the impeller body, and the diffuser body may be provided in a shape in which the circumference increases from one end surface to the other end surface along the longitudinal direction of the shaft.

Meanwhile, the protrusion may be formed within a radius of the rotor, and the protrusion may extend from the support while forming a predetermined inclination angle.

The features of each of the above-described embodiments may be implemented in combination in other embodiments as long as they are not contradictory or exclusive to other embodiments.

According to various embodiments of the present invention, cooling performance around a motor rotor can be improved, and structural life can be expected to be increased through reduction of the axial load of the rotor assembly.

Therefore, it is expected that the heat dissipation performance of small high-speed motors will be improved and durability will be improved through reduction of the axial load of the rotor assembly.

The effects of the present invention are not limited to those described above, and other effects not mentioned will be clearly recognized by those skilled in the art from the description below.

FIG. 1 is a perspective view of a motor assembly according to one embodiment of the present invention.
Figure 2 is an exploded perspective view of a motor assembly according to one embodiment of the present invention.
FIG. 3 is a perspective view of a rotor having an end plate applied according to various embodiments of the present invention.
FIGS. 4 and 5 are drawings showing the internal configuration and flow of a motor assembly according to one embodiment of the present invention.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. The following detailed description is provided to help 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 embodiments of the present invention, if it is judged that a detailed description of a known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description will be omitted. In addition, the terms described below are terms defined in consideration of their functions in the present invention, and may vary depending on the intention or custom of the user or operator. Therefore, the definitions should be made based on the contents throughout this specification. The terms used in the detailed description are only for describing embodiments of the present invention, and should never be limited. Unless clearly used otherwise, the singular form includes the plural form. In this description, expressions such as "comprises" or "comprising" are intended to indicate certain features, numbers, steps, operations, elements, parts or combinations thereof, and should not be construed to exclude the presence or possibility of one or more other features, numbers, steps, operations, elements, parts or combinations thereof other than those described.

In addition, when describing components of an embodiment of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only intended to distinguish the components from other components, and the nature, order, or sequence of the components are not limited by the terms.

FIG. 1 is a perspective view of a motor assembly according to one embodiment of the present invention, and FIG. 2 is an exploded perspective view of a motor assembly according to one embodiment of the present invention.

The following description is provided with reference to Figures 1 and 2.

The motor assembly (1) according to one embodiment of the present invention can be used in small home appliances. For example, it can be used in a vacuum cleaner. Vacuum cleaners include a canister type in which a nozzle for sucking dust and a dust collector for storing dust are connected by a hose, and a handy type in which the nozzle and dust collector are provided as a single module. In the case of the handy type, since cleaning is performed while the user holds the entire vacuum cleaner module, overall miniaturization and weight reduction of the vacuum cleaner are required.

The above motor assembly (1) can be applied to small home appliances to meet the requirements described above.

The motor assembly (1) of the present embodiment may include a shroud (10), an impeller (20), a diffuser (30), a housing cover (40), a core assembly (5), and a motor housing (60).

The above shroud (10) can guide and inhale outside air. And it can form the upper outer appearance of the motor assembly.

The above shroud (10) may include a suction portion (101), an inclined portion (102), and a third connecting portion (103). The suction portion (101) may be provided in a hollow ring shape at the top of the shroud (10). Since outside air is introduced through the suction portion (101), the diameter of the suction portion (101) may be designed in consideration of the diameter of the impeller (20).

The above shroud (10) may include an inclined portion (102) that extends from the suction portion (101) and forms a gentle curve. The inclined portion (102) may be provided in a shape in which the diameter increases along the axial direction from the suction portion (101). The inclined portion (102) may form a gentle curve in order to minimize elements that may act as resistance to the flow of air introduced through the suction portion (101).

One end of the above-described inclined portion (102) may be formed with the above-described suction portion (101), and the other end of the above-described inclined portion (102) may be formed with a third coupling portion (103). The third coupling portion (103) may extend radially outward from the other end of the above-described inclined portion (102) to form a predetermined thickness. The third coupling portion (103) may contact one surface of the second coupling portion (403) of the housing cover (40) to couple the shroud (10) and the housing cover (40). It goes without saying that various structures for coupling the third coupling portion (103) and the second coupling portion (403) may be applied within the thickness of the above-described third coupling portion (103).

The above impeller (20) may include a through hole (20a), a blade (203), and an impeller body (201). The above impeller (20) may be installed on one side of the shaft (52). More specifically, the impeller (20) may be installed on the opposite side of the shaft (52) where the rotor (53) is installed, based on the axial direction of the shaft (52).

By connecting the shaft (52) forming the rotation axis of the motor to the through hole (20a), the impeller (20) can be fixed to one side of the shaft (52). The impeller (20) can be fixed to the shaft (52) in various ways, and as an example, it can be done by a screw fastening method.

The impeller body (201) may be provided with a shape in which the circumference thereof widens along the axial direction of the shaft (52). The blade (203) may extend from the outer surface of the impeller body (201) toward the radial outer side of the shaft (52). The blade (203) may be provided along the longitudinal direction of the impeller body (201). The blade (203) may be arranged spaced apart from each other along the circumferential direction on the outer surface of the impeller body (201).

The impeller (20) of the present embodiment may be provided as a diagonal impeller that sucks in gas such as air in the axial direction of the shaft (52) and then discharges it in an oblique direction between the centrifugal direction and the axial direction.

That is, the gas flowing into the interior of the shroud (10) through the suction portion (101) can be guided toward the motor housing (60) along the outer surface of the impeller body (201) by the rotation of the blade (203). However, the embodiments of the present invention are not limited thereto, and the impeller (20) may be provided as a centrifugal impeller that sucks in gas in the axial direction and discharges it in the centrifugal direction. However, for the convenience of explanation, the following description will focus on the case where the impeller (20) is a diagonal impeller.

The diffuser (30) may include a through hole (30a), a fastening hole (), a diffuser body (301), and a vane (303). The diffuser (30) may convert the dynamic pressure of the gas passing through the impeller (20) into static pressure.

The above diffuser (30) can be fastened to the shaft (52) by inserting the shaft (52) into the through hole (30a), and the diffuser (30) can be provided between the impeller (20) and the rotor (53). Therefore, the through hole (30a) can be provided at a position that communicates with the through hole (20a) of the impeller (20) when the impeller (20) and the diffuser (30) are fastened to the shaft (52). In addition, the fastening hole (30b) is configured to fasten the diffuser (30) to the housing cover (40).

The diffuser body (301) may be provided with a shape in which the circumference thereof widens along the axial direction of the shaft (52). The vane (303) may extend from the outer surface of the diffuser body (301) toward the radial outer side of the shaft (52). The vane (303) may be provided along the longitudinal direction of the diffuser body (301). The vane (303) may be arranged to be spaced apart from each other along the circumferential direction on the outer surface of the diffuser body (301).

According to this structure, gas flowing into the shroud (10) through the suction portion (101) can be guided to the space between the shroud (10) and the diffuser (30) by the impeller (20), and gas flowing between the inner surface of the shroud (10) and the diffuser (30) can be guided to the core assembly (5) side by a plurality of vanes (303).

The housing cover (40) may include a through hole (40a), a fastening hole (40b), a second bearing housing (401), a second bridge (402), and a second connecting portion (403).

The above through hole (40a) is configured to be inserted into a shaft (52), and when the housing cover (40), diffuser (30), and impeller (20) are combined to the shaft (52), it can be formed at a position where the through hole (20a) of the impeller and the through hole (30a) of the diffuser are in communication.

The above-mentioned fastening hole (40b) is a configuration for joining the diffuser (30) and the housing cover (40), and can be formed at a position that communicates with the fastening hole (30b) of the diffuser when the diffuser (30) is joined to the housing cover (40).

The second bearing housing (401) is configured to accommodate a second bearing (50) for supporting one side of the shaft (52), and is preferably provided at the center of the housing cover (40). The second bearing (50) may be, for example, a ball bearing, and the shaft (52) may have a step formed radially inwardly on the outer surface of the shaft (52) to support the second bearing (50). Alternatively, the shaft (52) may have a step formed radially outwardly on the outer surface of the shaft (52) to support the second bearing (50).

The second coupling portion (403) extends radially outwardly from the shaft (52) to form a predetermined thickness. One surface of the second coupling portion (403) contacts the third coupling portion (103) of the shroud (10), and the other surface of the second coupling portion (403) contacts the first coupling portion (601) of the motor housing (60), thereby allowing the shroud (10), the housing cover (40), and the motor housing (60) to be coupled. It goes without saying that various structures for the above-described coupling may be applied within the thickness of the second coupling portion (403).

The second bridge (402) connects the second bearing housing (401) and the second connecting portion (403). A plurality of second bridges (402) may be provided to ensure structural stability of the housing cover (40), and may be formed to a predetermined thickness to secure the rigidity of the second bridge (402).

When the second bridge (402) is provided in multiple numbers while forming a predetermined thickness, it can act as resistance to the flow of outside air introduced through the suction unit (101). Therefore, the second bridge (402) of the present embodiment forms a predetermined incline along the longitudinal direction of the shaft (52). As the second bridge (402) is provided at an incline, the portion that acts as resistance to the flow of outside air introduced through the suction unit (101) can be minimized. In addition, by guiding the flow toward the core assembly (5), it is possible to cool the heat generated by the current flowing through the coil (56).

Meanwhile, the diffuser (30) can be formed integrally with the housing cover (40), but is preferably manufactured separately from the housing cover (40) and then connected to the housing cover (40).

The rotor (53) may be provided to surround a portion of the outer surface of the shaft (52). The shaft (52) may rotate due to the electromagnetic interaction between the rotor (53) and the core assembly (5), and as the shaft (52) rotates, the impeller (20) connected to the shaft (52) may also rotate together with the shaft (52), and as the impeller (20) rotates, outside air may be sucked into the interior of the motor assembly (1).

The core assembly (5) may include a core (54), an insulator (55a, 55b), and a coil (56). The motor of the present embodiment is exemplified as a BLDC motor (brushless direct current motor). Therefore, the core assembly (5) of the present embodiment may be placed on the outside of the rotor (53).

The above core (54) is provided along the circumference of the rotor (53) to form a shaft, and a plurality of cores may be provided. The core (54) of the present embodiment is an independent C-shaped core formed with two pole arms that are spaced apart from each other and extend in the radial direction of the shaft (52) and a yoke that connects the two pole arms.

The above insulator (55a, 55b) is coupled to the core (54) and surrounds the pole arm and yoke of the core (54) to insulate between the core (54) and the coil (56). The insulator may be provided as a first insulator (55a) and a second insulator (55b) so that it can be easily assembled to the core (54).

The motor housing (60) may include a first coupling portion (601), a core support portion (603), a first bridge (605), and a first bearing housing (607).

The first coupling portion (601) is configured to be coupled with the second coupling portion (403) of the housing cover (40) as described above, and may be provided in a hollow ring shape. In addition, the core assembly (5) may be coupled to the motor housing (60) along the axial direction of the shaft (52) by penetrating the first coupling portion (601).

The core support member (603) is configured to support the core assembly (5) and may extend from the first coupling member (601) along the longitudinal direction of the shaft (52). A mounting groove (6033) may be formed on a surface of the core support member (603) facing the shaft (52). The core assembly (5) may be accommodated in the mounting groove (6033).

The above core support member (603) may be formed with a second hole (6031). The heat generated by current flowing through the coil (56) through the second hole (6031) may be released, or the outside air introduced through the intake member (101) may be discharged through the core assembly (5) to the second hole (6031), thereby cooling the core assembly (5).

The first bearing housing (607) is configured to accommodate a first bearing (57) for supporting one side of the shaft (52). Therefore, it is preferable that the first bearing housing (607) be formed in the center of the motor housing (60). The first bearing (57) may be, for example, a ball bearing. Since the first bearing (57) and the second bearing (50) support both sides of the shaft (52), the shaft (52) can rotate stably.

The first bridge (605) connects the first bearing housing (607) and the core support (603). A plurality of first bridges (605) may be provided to ensure structural stability of the motor housing (60), and may be formed to a predetermined thickness to secure the rigidity of the second bridge (402).

And the first bridge (605) may be formed with a first hole (6051). The first hole (6051) may be formed within the thickness of the first bridge (605), and when the first bridge (605) is provided in plurality while forming a predetermined thickness, it may act as resistance to the flow passing through the inside of the motor housing (60) along the longitudinal direction of the shaft (52). Therefore, the first bridge (605) of the present embodiment may minimize the portion that acts as resistance to the flow by forming the first hole (6051) along the longitudinal direction of the first bridge (605), while at the same time securing the rigidity of the motor housing (60).

FIG. 3 is a perspective view of a rotor to which an end plate is applied according to various embodiments of the present invention. FIG. 3a is a drawing showing an end plate having a protrusion formed in a support portion, and FIG. 3b is a drawing showing an end plate having a groove formed in a support portion.

The following explanation is given with reference to Fig. 3a.

The end plates (581, 582) of the present embodiment can be provided on both sides of the rotor (53). The end plates (581, 582) can fix the position so that the rotor (53) can be provided to surround a part of the outer surface of the shaft (52), and can play a role in supporting the rotor (53).

The end plates (581, 582) of the present embodiment may be provided at both ends of the rotor (53) along the longitudinal direction of the shaft (52). The end plates may include a first end plate (581) provided at one end of the rotor (53) and a second end plate (582) provided at the other end of the rotor (53).

Accordingly, the first end plate (581) may be provided between the impeller (20) and one surface of the rotor (53), and the second end plate (582) may be provided between the other surface of the rotor (53) and the first bearing housing (607).

The above first end plate may include a support portion (5811) and a protrusion portion (5813).

The above support member (5811) can be defined as a configuration that contacts an end surface of the rotor (53) and supports the rotor (53). That is, the support member (5811) can make surface contact with one end surface of the rotor (53).

The above protrusion (5813) extends from the support (5811) along the length of the shaft (52). The above protrusion (5813) can be formed within the radius of the rotor (53).

The radius of the rotor (53) above may mean the radius from the center of rotation of the shaft (52) to the outer surface of the rotor (53), since the rotor (53) is provided to surround a portion of the outer surface of the shaft (52). Alternatively, it may mean the thickness of the rotor (53), which is the distance from the inner surface of the rotor (53) to the outer surface of the rotor (53).

That is, the protrusion (5813) extends from the support (5811) along the length of the shaft (52), but protrudes within the radius of the rotor (53), so that when the rotor (53) rotates, the protrusion (5813) can be prevented from coming into contact with the core assembly (5), thereby reducing the durability of the motor assembly.

The above protrusion (5813) can extend from the support (5811) at a predetermined angle of inclination. That is, the protrusion (5813) can form an inclined surface based on the axial direction of the shaft (52), and by the structure of the protrusion (5813), an external force acting as a counterforce to the axial load of the shaft (52) when the rotor (53) rotates can be transmitted to the shaft (52).

In more detail, the shaft (52) receives an axial load due to the impeller (20) and diffuser (30) coupled to the upper side based on the rotor (53), which may shorten the life of the motor assembly. Accordingly, when the protrusion (5813) forms an inclined surface and rotates together with the rotor (53), an external force is provided to the shaft (52) in a direction opposite to the axial direction, thereby reducing the axial load applied to the shaft (52).

Of course, even if the above-described inclined surface is not formed on the protrusion (5813) and the protrusion (5813) is formed along the axial direction of the shaft (52) from the support (5811), an airflow can be formed between the rotor (53) and the core (54) by the rotation of the rotor (53).

However, as described above, when the protrusion (5813) extends from the support (5811) while forming a predetermined inclination angle, the strength of the airflow between the rotor (53) and the core (54) can be increased, and the axial load of the shaft (52) can also be reduced.

The second end plate (582) may be formed with a support portion (5821) and a protrusion portion (5823) corresponding to the support portion (5811) and the protrusion portion (5813) of the first end plate (581) described above. That is, the support portion (5821) of the second end plate (582) is in surface contact with the other end surface of the rotor (53) and supports the rotor (53), and the protrusion portion (5823) may extend from the support portion (5821) along the axial direction of the shaft (52).

The protrusion (5813) of the first end plate (581) and the protrusion (5823) of the second end plate (582) can be formed symmetrically with respect to the rotor (53).

Alternatively, in order to increase the strength of the flow between the rotor (53) and the core (54) described above and at the same time enhance the offsetting effect of the axial load of the shaft (52), one of the protrusions of the first end plate (581) or the second end plate (582) may be inclined in either the left-hand or right-hand thread direction with respect to the rotational direction of the shaft (52), and the other of the protrusions of the first end plate (581) or the second end plate (582) may be inclined in the right-hand or left-hand thread direction with respect to the rotational direction of the shaft (52).

In this case, the angle of inclination formed by the protrusion (5813) and the support (5811) of the first end plate (581) can form an angle of inclination formed by the protrusion (5823) and the support (5821) of the second end plate (582) at an angle different from the axial direction of the shaft (52).

Meanwhile, Fig. 3b is a drawing showing an end plate in which a groove (5813b) is formed in a support portion (5811b). The groove (5813b) has a configuration corresponding to the protrusion (5813) and is formed by being sunken along the longitudinal direction of the shaft (52) from the support portion (5811b).

FIGS. 4 and 5 are drawings showing the internal configuration and flow of a motor assembly according to one embodiment of the present invention. The following description will be given with reference to FIGS. 4 and 5.

In the motor assembly of this embodiment, the impeller (20) coupled to the shaft (52) rotates according to the rotation of the rotor (53). When the impeller (20) rotates, outside air is drawn in through the suction portion (101) of the shroud (10). The drawn in outside air moves in a first direction and is discharged. The first direction means the direction in which the outside air drawn in through the suction portion (101) passes through the interior of the motor assembly, passes through the motor housing (60), and is discharged through the space between the first bridge (605), the first hole (6051) or the second hole (6031) formed in the first bridge (605). That is, the first direction can be defined as the direction from the suction portion (101) side toward the motor housing (60).

The outside air drawn in through the above suction portion (101) can move along the space (S1) between the inner surface of the diffuser (30) and the shroud (10), pass between the inner wall of the motor housing (60) and the outer surface of the coil (54), and form a first flow (f1) discharged through the space between the first bridges (605) or the first hole (6051) formed in the first bridge (605).

Alternatively, the outside air drawn in through the suction portion (101) may move along the space (S1) between the inner surface of the diffuser (30) and the shroud (10), and then change direction at the inner wall of the motor housing (60) and move along the inner surface of the coil (54) to form a second flow (f2) discharged through the space between the first bridges (605) or the first hole (6051) formed in the first bridge (605). The second flow (f2) may be formed by the step between the first coupling portion (601) and the core support portion (603).

Alternatively, the outside air drawn in through the above-described intake (101) may move along the space (S1) between the diffuser (30) and the inner surface of the shroud (10) and then form a fourth flow (f4) that is discharged to the outside through the space (S2) between the core supports (603) or the second hole (6031) formed in the core supports (603).

Meanwhile, as the end plate (58) rotates together with the rotor (53), a third flow (f3) is generated that moves in a second direction opposite to the first direction. The second direction can be defined as a direction from the motor housing (60) toward the suction portion (101).

The above third flow (f3) is a flow in which outside air on the motor housing (60) side flows into the inside of the motor assembly, and more specifically, it may mean a flow flowing into the inside of the motor assembly through the space between the first bridges (605) of the motor housing (60) or the first hole (6051).

Since the above third flow (f3) is formed by the rotation of the end plate (58), it can pass between the rotor (53) and the core (54), but can move along the outer surface of the rotor (53).

And the second flow (f2) is a flow that flows between the rotor (53) and the core (54) like the third flow (f3), but is formed closer to the core (54) than the third flow (f3). This is because the second flow (f2) is formed by separating the air introduced through the suction part (101) and moving along the winding surface of the coil (56).

In addition, the outside air drawn in through the above-mentioned intake portion (101) may move along the space (S1) between the diffuser (30) and the inner surface of the shroud (10) to form a fifth flow (f5) that joins the airflow in the second direction formed by the end plate (58) before being discharged from the lower side of the motor housing (60).

The above fifth flow (f5) can be defined as a flow that moves toward the shaft (52) along the space (S3) between the core assembly (5) and the first bridge (605) or the first bearing housing (607) and moves between the rotor (53) and the core (54) along the second direction.

The fifth flow (f5) can preferably join the third flow (f3) and move along the second direction.

The above-described first flow (f1), second flow (f2), and fourth flow (f4) can cool the outer direction of the coil (56) wound around the core (54). The outer direction of the coil (56) can mean the coil (56) facing the inner wall side of the motor housing (60) among the wound coils.

The third flow (f3) and the fifth flow (f5) described above can cool the inner direction of the coil (56) wound around the core (54). The inner direction of the coil (56) can be defined as a direction opposite to the outer direction of the coil (56) described above, and can mean a coil (56) facing the rotor (53) side among the wound coils.

In addition, the life of the motor assembly can be increased by offsetting the axial load of the shaft (52) by the third flow (f3) and the fifth flow (f5).

Although various embodiments of the present invention have been described in detail above, those skilled in the art 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 rights of the present invention should not be limited to the described embodiments, but should be determined not only by the claims described below but also by equivalents of the claims.

1: Motor assembly
10: Shroud 101: Intake
102: Slope 103: Third joint
20: Impeller
20a: Through hole 201: Impeller body
203: Blade
30: Diffuser
30a: Through hole 30b: Fastening hole
301: Diffuser body 303: Vane
40: Housing cover
40a: Through hole 40b: Fastening hole
401: Second bearing housing 402: Second bridge
403: Second joint
60: Motor Housing
601: First joint 603: Core support
6031: 2nd hole
605: 1st Bridge 6051: 1st Hall
607: First bearing housing
5: Core Assembly
50: Second bearing 52: Shaft
53: Rotor 54: Core
541: Polarm 542: Connector
543: Paul Shu
56: Coil 57: First bearing

Claims (21)

delete delete delete delete delete delete delete A shroud having an intake port for admitting outside air;
A motor housing fixed to the above shroud and equipped with a discharge portion for discharging air drawn into the above suction portion to the outside;
An impeller located inside the above shroud;
A diffuser positioned within the shroud and between the impeller and the motor housing;
A shaft penetrating the diffuser and connected to the impeller, the shaft forming the rotation axis of the impeller;
A core fixed to the above motor housing to form a shaft;
a rotor coupled to the shaft and rotated by the core; and
It includes an end plate provided on each side of the rotor along the axial direction of the shaft;
The above end plate,
A support member that contacts the end face of the rotor and supports the rotor; and
including a protrusion extending along the length of the shaft from the support;
The above impeller forms a flow that moves outside air along a first direction from the suction portion toward the discharge portion into the space between the inner wall of the motor housing and the core,
A motor assembly characterized in that the end plate forms a flow that moves outside air introduced through the discharge portion along a second direction opposite to the first direction into the space between the rotor and the core, and a flow that moves air introduced into the shroud through the suction portion between the core and the discharge portion along the second direction into the space between the rotor and the core. In Article 8,
The above diffuser,
a diffuser body attached to the above shaft; and
A motor assembly characterized by including a plurality of vanes extending radially outwardly of the shaft from the outer surface of the diffuser body. In Article 9,
The above impeller,
an impeller body connected to the above shaft; and
A motor assembly characterized by including a plurality of blades extending radially outwardly of the shaft from an outer surface of the impeller body. In Article 10,
A motor assembly characterized in that the impeller body is provided with a shape in which the circumference increases from one end surface to the other end surface along the longitudinal direction of the shaft. In Article 11,
A motor assembly characterized in that the circumference of one end of the above diffuser body is formed to be equal to or larger than the circumference of the other end of the above impeller body. In Article 12,
A motor assembly characterized in that the diffuser body is provided with a shape in which the circumference increases from one end surface to the other end surface along the longitudinal direction of the shaft. In Article 8,
A motor assembly, characterized in that the protrusion is formed within a radius of the rotor. In Article 14,
A motor assembly, characterized in that the protrusion extends from the support portion while forming a predetermined incline angle. In Article 15,
A motor assembly characterized in that the protrusion extends while forming an inclined angle in either a left-hand thread direction or a right-hand thread direction based on the rotational direction of the shaft. In Article 8,
The above end plate,
A first end plate provided between the impeller and one surface of the rotor; and
A motor assembly characterized by including a second end plate provided on the other surface of the rotor. In Article 17,
A motor assembly characterized in that the protrusion of the first end plate is symmetrical with respect to the protrusion of the second end plate with respect to the rotor. In Article 17,
A motor assembly characterized in that the protrusion of the first end plate and the protrusion of the second end plate extend from each support portion while forming a predetermined inclination angle. In Article 8,
A motor assembly, characterized in that the two second-directional flows formed by the end plates merge and move into the space between the rotor and the core. In Article 8,
A motor assembly, characterized in that the flow that moves air introduced through the suction portion among the two second-directional flows formed by the end plate into the space between the rotor and the core is branched from the flow moving along the first direction by the impeller.