Motor and drainage pump including the same

Abstract

This embodiment relates to a motor and a drainage pump including the same. The motor of this embodiment may include: a rotor; a rotating shaft extending through the center of the rotor; and a shaft securing member supporting the rotor and the rotating shaft. The shaft securing member and the rotor may include securing means disposed in a direction intersecting the rotational direction of the rotating shaft to prevent the rotating shaft from idling.

Description

Technical Field

[0001] The present invention relates to a motor and a drainage pump comprising the same. Background Art

[0002] Drain pumps are used in laundry handling appliances such as washing machines or dryers, or dishwashers, and use either a unidirectional or bidirectional motor, depending on the requirements.

[0003] The drainage pump should enable the impeller to operate normally even when immersed in water or in contact with water, and may include a rotating shaft for rotating the impeller.

[0004] The rotating shaft is coupled to a rotor of a motor. The rotor may include a magnet and may be configured to have a ring shape.

[0005] When current is applied to the motor, the rotating shaft and the rotor rotate integrally, and therefore a shaft fixing member is required to firmly connect the rotating shaft and the rotor.

[0006] In conventional motors, the rotating shaft may idle due to a weakening or release of the coupling force of the shaft fixture supporting the rotor. To address this issue, a solution could be considered to implement a separate device or shape for securing the shaft fixture and the rotor.

[0007] Meanwhile, the motor rotor can be formed by compressing and sintering a base material, such as a powdered metal, at high temperature. During this forming process, the material is pressed by a pressurizing mechanism. To prevent cracks in the rotor, the rotor shape must have fewer steps in the direction in which the pressurizing mechanism presses the material, or the material density must be uniform.

[0008] Prior art literature

[0009] Patent Literature

[0010] Patent Document 1: Korean Patent Publication No. 10-2007-0019148 (February 15, 2007) Summary of the Invention

[0011] In order to solve the above-mentioned problem, an object of the present embodiment is to provide a motor including a fixing device including a rotor, a shaft fixing member, and a rotating shaft, so as to prevent the rotating shaft from idling.

[0012] The purpose of this embodiment is to provide a motor, wherein the shaft fixing component is arranged on the inner side of the rotor by insert injection molding, and the fixing device is arranged in a direction that interferes with or intersects with the rotation direction of the rotor to achieve a firm connection between the rotor and the rotating shaft.

[0013] The object of this embodiment is to provide a motor, wherein the fixing device includes a fixing protrusion provided on any one of the rotor and the shaft fixing member and a protrusion groove for supporting the fixing protrusion, so that the fixing device can be set in the direction where the interference occurs.

[0014] The purpose of this embodiment is to provide a motor, wherein the rotor has a ring shape with its upper and lower parts penetrating, and the fixing protrusion protrudes from the inner circumferential surface side of the rotor to achieve a firm connection between the shaft fixing member and the rotor.

[0015] An object of this embodiment is to provide a motor, wherein the fixing protrusion has a shape with fewer steps formed in the penetrating direction of the rotating shaft, so as to prevent cracks from being generated during the molding process of the rotor.

[0016] To this end, the fixing protrusion has a substantially uniform step having a length greater than a predetermined length in the radial direction.

[0017] In order to solve the above-mentioned problems, the motor of this embodiment may include: a rotor; a rotating shaft that passes through the center of the rotor; and a shaft fixing member that supports the rotor and the rotating shaft. The shaft fixing member and the rotor may include a fixing device arranged in a direction intersecting with the rotation direction of the rotating shaft to prevent the rotating shaft from idling.

[0018] The fixing device may include a fixing protrusion provided on one of the rotor and the shaft fixing member, and a protrusion groove provided on the other of the rotor and the shaft fixing member for supporting the fixing protrusion. Interference between the fixing protrusion and the protrusion groove can prevent the shaft fixing member from being separated from the rotor during rotation of the rotor.

[0019] The fixing device may include: a fixing protrusion provided on the rotor; and a protrusion groove provided on the shaft fixing member.

[0020] The rotor may have a ring shape and may include an outer peripheral surface and an inner peripheral surface. The fixing protrusion may be provided on the inner peripheral surface of the rotor, and the protrusion groove may be provided on a jaw portion of the shaft fixing member.

[0021] The rotating shaft may extend in the vertical direction, and the fixing protrusion may be provided on a cone portion for connecting the upper end portion of the rotor and the inner circumference of the rotor. Therefore, the fixing protrusion may be provided at a position lower than the upper end portion of the rotor.

[0022] The rotating shaft may extend in the vertical direction, and the fixing protrusion may be provided on a cone portion for connecting the lower end portion of the rotor to the inner circumference of the rotor. Therefore, the fixing protrusion may be provided at a position higher than the lower end portion of the rotor.

[0023] The fixing protrusion is provided at a height between the upper and lower ends of the rotor, and thus the shaft fixing member can easily support the upper and lower ends of the rotor and the inner circumferential surface of the rotor while supporting the fixing protrusion.

[0024] The rotor may include a conical portion, which is inclined from the upper end portion toward the inner circumferential surface or from the lower end portion toward the inner circumferential surface. Therefore, compared with the case where the conical portion extends directly downward from the upper end portion (or lower end portion) toward the inner circumferential surface, cracks can be prevented from being generated during the molding process of the rotor.

[0025] The outer circumferential surface of the fixing protrusion can have a shape that forms a portion of the outer circumferential surface of a cylinder. With this configuration, the upper end of the fixing protrusion can have a shape that extends along the radius of the rotor by a predetermined length or more, thereby preventing cracks from forming during the rotor forming process (stamping process).

[0026] The number of the fixing protrusions is the same as the number of magnet poles of the rotor, so a uniform magnetic field can be formed based on the rotation direction of the rotor.

[0027] A motor according to an embodiment of the present invention may include a rotating shaft; a ring-shaped magnet disposed on an outer circumference of the rotating shaft and having an outer circumferential surface and an inner circumferential surface; and a shaft fixing member for fixing the magnet and the rotating shaft.

[0028] The magnet may further include a fixing protrusion that protrudes from the inner peripheral surface portion in a direction intersecting with a rotational direction of the magnet and interferes with the shaft fixing member.

[0029] The shaft fixing member may form a protrusion groove for receiving the fixing protrusion.

[0030] The magnet may further include a fixing protrusion that protrudes from the inner peripheral surface portion in a direction intersecting with a rotational direction of the magnet and interferes with the shaft fixing member.

[0031] The magnet may further include a first end portion extending from one side of the outer peripheral surface portion toward the inner side of the magnet in the radial direction; and a second end portion extending from the other side of the outer peripheral surface portion toward the inner side of the magnet in the radial direction.

[0032] The fixing protrusion may be located closer to an inner center of the magnet than the first end or the second end.

[0033] The fixing protrusion may be provided on an inner peripheral surface portion of the magnet.

[0034] The inner peripheral surface of the magnet may include: a first inner peripheral surface in a ring shape; and a second inner peripheral surface that protrudes from the first inner peripheral surface toward the first end or the second end and forms a surface of the fixing protrusion.

[0035] The surface of the fixing protrusion forming the second inner peripheral surface portion may form the innermost surface of the fixing protrusion in the radial direction.

[0036] The distance from the first inner circumferential surface to the tip of the fixing protrusion is smaller than the distance from the first inner circumferential surface to the first end portion or the second end portion, so that the fixing protrusion does not protrude outside the first end portion or the second end portion.

[0037] The magnet may further include: a cone portion extending obliquely from the first end portion toward the interior of the magnet; and an inner extension portion extending from the cone portion toward the inner side in the radial direction of the magnet.

[0038] The fixing protrusion may be provided on at least one of the vertebral body portion and the inner extension portion.

[0039] The fixing protrusion may be arranged across the vertebral body and the inner extension portion.

[0040] The fixing protrusion may include a protrusion outer peripheral surface portion having a preset curvature to form a portion of the outer peripheral surface of a cylinder.

[0041] A plurality of the fixing protrusions may be provided along the circumferential direction of the inner circumferential surface portion of the magnet, and two of the plurality of fixing protrusions may overlap with a portion and another portion of the outer circumferential surface of the cylindrical body.

[0042] Six fixing protrusions may be provided corresponding to the number of poles of the magnet, and the first fixing protrusion and the fourth fixing protrusion among the six fixing protrusions may constitute a part of the outer circumferential surface of the first cylinder.

[0043] The second fixing protrusion and the fifth fixing protrusion among the six fixing protrusions may constitute a portion of the outer circumferential surface of the second cylinder.

[0044] The third fixing protrusion and the sixth fixing protrusion among the six fixing protrusions may constitute a portion of the outer circumferential surface of the third cylinder.

[0045] The fixing protrusions may be provided on the inner circumferential surface side of the first end portion and the inner circumferential surface side of the second end portion, respectively.

[0046] The shaft fixing member may include: a first end support portion, which extends from one side of the magnet support portion toward the outside in the radial direction and covers a portion of the first end portion of the magnet; and a second end support portion, which extends from the other side of the magnet support portion toward the outside in the radial direction and covers a portion of the second end portion of the magnet.

[0047] A protrusion groove for supporting the fixing protrusion may be formed in the jaw portion formed by the magnet support portion and the first end support portion or the magnet support portion and the second end support portion.

[0048] The jaw portion is provided with a vertebral body supporting portion having an inclined surface for supporting the vertebral body portion of the magnet, and the protruding groove may be recessed and formed in the vertebral body supporting portion.

[0049] According to the embodiment of the present invention, since the fixing device including the rotor, the shaft fixing member, and the rotating shaft is provided, it is possible to prevent the shaft fixing member from being separated from the rotor and to prevent the rotating shaft from idling.

[0050] The shaft fixing member is arranged on the inner side of the rotor by insert injection molding, and the fixing device is arranged in a direction that interferes with or intersects with the rotation direction of the rotor, thereby achieving a firm connection between the rotor and the rotating shaft.

[0051] The fixing device includes: a fixing protrusion provided on either the rotor or the shaft fixing member; and a protrusion groove for supporting the fixing protrusion, so that the fixing device can be easily arranged in a direction that interferes with (intersects) the rotation direction of the rotor.

[0052] The rotor has a ring shape with its upper and lower parts penetrating therethrough, and the fixing protrusion protrudes from the inner peripheral surface side of the rotor, thereby enabling a strong connection between the shaft fixing member and the rotor.

[0053] The fixing protrusion may have a shape having a small number of steps with respect to a penetrating direction of the rotation shaft.

[0054] As an example, the fixing protrusion may be configured to have a uniform step having a length greater than or equal to a predetermined length in the radial direction, thereby preventing cracks from being generated during the molding process of the rotor. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 It is a perspective view of a drainage pump according to an embodiment of the present invention.

[0056] Figure 2 It is an exploded perspective view of the drainage pump.

[0057] Figure 3 is an exploded perspective view of a motor assembly according to an embodiment of the present invention.

[0058] Figure 4 It is along Figure 2 A cross-sectional view taken along line 4-4'.

[0059] Figure 5 It is a perspective view showing a coupled state between a rotor and a rotating shaft according to an embodiment of the present invention.

[0060] Figure 6 This is an exploded perspective view showing the rotor, rotating shaft, and surrounding structures of an embodiment of the present invention.

[0061] Figure 7 It is a perspective view showing the structure of a rotor according to an embodiment of the present invention.

[0062] Figure 8 FIG. 1 is a diagram schematically showing the shape of a fixing protrusion of a rotor according to an embodiment of the present invention.

[0063] Figure 9 This is a diagram of a rotor according to an embodiment of the present invention as viewed from the front.

[0064] Figure 10 It is along Figure 9 A cross-sectional view taken along the 10-10' line.

[0065] Figure 11 It is a plan view showing the structure of a rotor according to an embodiment of the present invention.

[0066] Figure 12 It is an upper perspective view showing the structure of the shaft fixing member according to the embodiment of the present invention.

[0067] Figure 13 It is a lower perspective view showing the structure of the shaft fixing member according to the embodiment of the present invention.

[0068] Figure 14 This is a front view showing the structure of the shaft fixing member according to the embodiment of the present invention.

[0069] Figure 15 It is along Figure 5 A cross-sectional view taken along the 15-15' line.

[0070] Figure 16A and Figure 16B 1 is a schematic diagram showing that cracks may be generated during the rotor molding process when the rotor has spherical fixing protrusions.

[0071] Figure 17A and Figure 17B 1 is a schematic diagram showing that cracks may not be generated during the rotor molding process when the rotor has cylindrical fixing protrusions. DETAILED DESCRIPTION

[0072] The present invention will become more apparent by describing in detail preferred embodiments thereof with reference to the accompanying drawings. It should be understood that the embodiments described herein are illustrative only to facilitate understanding of the invention, and that the present invention may be implemented in various variations from the embodiments described herein. Furthermore, to facilitate understanding of the invention, the drawings are not drawn to scale, and the dimensions of some components may be exaggerated.

[0073] Figure 1 is a perspective view of a drainage pump according to an embodiment of the present invention. Figure 2 is an exploded perspective view of the drainage pump, Figure 3 is an exploded perspective view of a motor assembly according to an embodiment of the present invention. Figure 4 It is along Figure 2 The cross-sectional view taken along line 4-4' is as follows: Figure 5 is a perspective view showing a coupled state between a rotor and a rotating shaft according to an embodiment of the present invention, Figure 6 This is an exploded perspective view showing the rotor, rotating shaft, and surrounding structures of an embodiment of the present invention.

[0074] Reference Figures 1 to 6 The drainage pump 10 according to an embodiment of the present invention includes a pump casing 20. The pump casing 20 may form a housing body 21, which is used to form a water storage space. An impeller 50 may be rotatably housed in the housing body 21. As an example, the housing body 21 may have a cylindrical shape.

[0075] The pump housing 20 may include a water inlet pipe 22 disposed on the housing body 21 for allowing water to flow in. The water inlet pipe 22 may protrude from the outer circumference of the housing body 21 so that water flows in along the axial direction of the impeller 50 disposed inside the housing body 21 .

[0076] The pump housing 20 may further include a water outlet pipe 23 , which is disposed on the housing body 21 and is used to discharge water. The water outlet pipe 23 may protrude from the outer circumference of the housing body 21 along a tangential direction.

[0077] The drain pump 10 may further include a motor assembly 100 coupled to the pump housing 20 . The pump housing 20 may include a protrusion 25 , and the motor assembly 100 may include a locking rib 116 coupled to the protrusion 25 .

[0078] The motor assembly 100 may include an impeller 50 and motor housings 110 , 120 .

[0079] The impeller 50 may include an impeller hub 51 disposed at a central portion of the impeller 50 and coupled to the rotating shaft 260 , and a plurality of blades 53 radially extending from an outer circumferential surface of the impeller hub 51 .

[0080] A motor may be disposed inside the motor housings 110 and 120 .

[0081] The motor housings 110 and 120 may include a first housing 110 and a second housing 120 . An internal space formed by the first housing 110 and the second housing 120 may form a motor accommodating space 122 for accommodating the motor.

[0082] The first housing 110 may be configured to surround a top surface of the stator 130 , thereby preventing flames from spreading to the outside when a fire occurs.

[0083] The first housing 110 may include a first housing body 111 having a hollow interior. A rotor receiving portion 113 for receiving the rotor 200 may be formed inside the first housing body 111. The rotor receiving portion 113 may be formed such that the upper end of the first housing body 111 is open.

[0084] Among the ends of the first housing body 111 , the upper end of the first housing body 111 may be understood as the end facing the impeller 50 , and the lower end of the first housing body 111 may be understood as the end on the opposite side of the upper end.

[0085] A placement surface 115 for placing a packaging device 150 may be formed at an upper end portion of the first housing body 111. The placement surface 115 may have an annular shape, and the rotor receiving portion 113 may be formed inside the placement surface 115.

[0086] The first housing 110 may further include a housing protrusion 114, which is provided along the periphery of the seating surface 115 and protrudes from the seating surface 115 toward the impeller 50. As an example, the housing protrusion 114 may have a ring shape.

[0087] A packaging device 150 may be provided on the upper side of the first housing 110 to prevent water or foreign matter from the pump housing 20 from penetrating into the motor and to cover the motor, thereby preventing the rotor 200 from being separated from the rotor accommodating portion 113 .

[0088] The packaging device 150 may include a packaging base 151 rotatably coupled to a rotation shaft 260 . The rotation shaft 260 may penetrate the packaging base 151 .

[0089] The packaging device 150 may further include a sealing member 153 disposed on the packaging base 151 . The sealing member 153 may have an outer circumferential surface in contact with an inner circumferential surface of the rotor accommodating portion 113 .

[0090] The packaging device 150 may further include a packaging cover 155 . The packaging cover 155 is disposed on an upper side of the packaging base 151 and is fixed to the packaging base 151 by pressing the sealing member 153 downward.

[0091] A shaft through portion 156 may be formed at the center of the packaging cover 155, and the rotating shaft 260 may be rotatably inserted into the shaft through portion 156. The rotating shaft 260 may extend upward from the rotor accommodating portion 113, penetrate the packaging base 151, the sealing member 153, and the packaging cover 155, and protrude upward.

[0092] The impeller 50 may be placed on an upper side of the packaging cover 155 and coupled to the rotating shaft 260 .

[0093] The second housing 110 may be configured to surround a bottom surface of the stator 130 , thereby preventing flames from spreading to the outside when a fire occurs.

[0094] The second housing 120 may include a second housing body 121 coupled to the lower side of the first housing 110. A hook 117 may be provided on an outer circumference of the first housing body 111, and a hook rib 127 coupled to the hook 117 may be provided on an outer circumference of the second housing body 121.

[0095] A support protrusion 128 for supporting the stator 130 of the motor may be provided inside the second housing body 121. The support protrusion 128 may protrude upward from the bottom surface of the second housing body 121.

[0096] A motor for generating a rotational force may be provided in the motor accommodation space 122 of the first housing 110 and the second housing 120. The motor may include a stator 130 and a rotor 200.

[0097] Since the rotor 200 is disposed inside the stator 130 , the motor may be referred to as an inner rotor type motor.

[0098] The stator 130 may include a stator core 131 formed by stacking a plurality of sheets in a cylindrical shape along a circumferential direction. The sheets may include a plurality of slots 132a and teeth 132b.

[0099] The stator 130 may further include a coil 133 wound around the stator core 131 . The coil 133 may be wound around the teeth 132 b between the slots 132 a of the stator core 131 .

[0100] The stator 130 may further include an insulator 135 interposed between the stator core 131 and the coil 133 to perform an insulation function.

[0101] When a voltage is applied to the stator 130 , current flows through the coil 133 to generate a rotating magnetic field, thereby rotating the rotor 200 .

[0102] The rotor 200 may include a magnet 210 , a shaft fixing member 250 for supporting the magnet 210 , and a rotating shaft 260 inserted into and coupled to the center of the shaft fixing member 250 .

[0103] The magnet 210 may include a magnet that rotates under the action of the rotating magnetic field of the stator 130 .

[0104] The magnet 210 has a ring (annular) shape and may be defined by an upper end surface, a lower end surface, an inner circumferential surface, and an outer circumferential surface. The upper end surface of the magnet 210 may be a surface facing the impeller 50, and the lower end surface of the magnet 210 may be a surface opposite to the upper end surface.

[0105] The magnet 210 can be manufactured using power metallurgy. Powder metallurgy can be defined as the process of using metal powder to create a metal object of a desired shape, such as by melting metal. Specifically, powder metallurgy refers to the production of metal powder or alloy powder and the use of these powders for compression molding (compacting), followed by sintering (sintering) below the melting temperature to produce a metal product, which can be understood as a compression sintering method.

[0106] As an example, the magnet 210 may be manufactured using iron powder.

[0107] The shaft fixing member 250 may be provided on the inner circumference of the magnet 210 and around the outer circumference of the rotating shaft 260. A portion of the shaft fixing member 250 may be configured to cover a portion of the upper end surface and the lower end surface of the magnet 210.

[0108] The shaft fixing member 250 may be formed by insert molding. Specifically, the shaft fixing member 250 may be formed by insert molding by filling a resin material with the rotating shaft 260 disposed inside the magnet 210 .

[0109] The shaft fixing member 250 may include a shaft support portion 253 surrounding the outside of the rotating shaft 260. The shaft support portion 253 may have a cylindrical shape with upper and lower portions penetrating therethrough, and a shaft insertion portion 251 for inserting the rotating shaft 260 may be formed therein.

[0110] The shaft support portion 253 may contact and engage with the outer circumference of the rotating shaft 260. For example, a groove may be formed on the outer circumference of the rotating shaft 260 in a horizontal or inclined manner, so that the shaft support portion 253 can be engaged with the rotating shaft 260 by knurling.

[0111] The shaft fixing member 250 may further include a magnet support portion 254, which is disposed around the outer side of the shaft support portion 253 and is used to support the inner circumference of the magnet 210. The magnet support portion 254 may have a cylindrical shape with upper and lower portions penetrating therethrough, and may contact and engage with the magnet 210.

[0112] The shaft fixing member 250 may further include a first connection portion 255 for connecting the shaft support portion 253 and the magnet support portion 254. The first connection portion 255 may extend radially from the shaft support portion 253 toward the magnet support portion 254.

[0113] The first connection portion 255 may extend long from an upper end portion to a lower end portion of the shaft fixing member 250 in a vertical direction.

[0114] A plurality of the first connection parts 255 may be provided, and the plurality of the first connection parts 255 may be spaced apart along the circumferential direction.

[0115] The shaft fixing member 250 may be formed with a recessed portion 256 defined by the shaft supporting portion 253, the magnet supporting portion 254, and two adjacent first connecting portions 255. The recessed portion 256 may be formed in a recessed manner at the upper end portion of the shaft fixing member 250 or at the lower end portion of the shaft fixing member 250.

[0116] The recessed portion 256 may be used to reduce the weight of the rotor 200 and may function as a weight-reducing groove for reducing deformation during injection molding of the shaft fixing member 250 .

[0117] The shaft fixing member 250 may further include a second connecting portion 259 , which is disposed inside the recessed portion 256 and is configured to connect the shaft supporting portion 253 and the magnet supporting portion 254 .

[0118] The second connection portion 259 may extend radially from the shaft support portion 253 toward the magnet support portion 254 .

[0119] The second connection portion 259 may be provided at a substantially middle height based on a vertical height from an upper end portion to a lower end portion of the shaft fixing member 250 .

[0120] The shaft fixing member 250 may include a first end support portion 257a covering a portion of the upper end portion of the magnet 210 and a second end support portion 257b covering a portion of the lower end portion of the magnet 210. The first end support portion 257a and the second end support portion 257b allow the shaft fixing member 250 to stably support not only the inner circumferential surface of the magnet 210 but also the upper and lower ends of the magnet 210.

[0121] A fixing device may be provided in a direction intersecting the rotation direction of the rotor 200 so that the shaft fixing member 250 and the magnet 210 are firmly coupled together, thereby preventing the rotation shaft 260 from idling.

[0122] The fixing device may include a magnet protrusion 220 provided on the magnet 210 and a protrusion groove 258b formed in the shaft fixing member 250. The magnet protrusion 220 may be provided on the inner circumference of the magnet 210, and the protrusion groove 258b may be recessed from the outer surface of the shaft fixing member 250 to accommodate the magnet protrusion 220.

[0123] A rotating shaft 260 may penetrate the shaft fixing member 250 . The rotating shaft 260 may protrude above the shaft fixing member 250 and be inserted into the impeller 50 .

[0124] The rotating shaft 260 may include a supporting jaw 263 for supporting the impeller 50. The supporting jaw 263 may protrude from the outer circumferential surface of the rotating shaft 260 in the circumferential direction, thereby supporting the bottom surface of the impeller 50. Since the impeller 50 is supported by the supporting jaw 263, the impeller 50 and the rotating shaft 260 can be stably coupled.

[0125] The rotating shaft 260 may be formed such that a diameter of a lower portion based on the supporting jaw portion 263 is larger than a diameter of an upper portion.

[0126] The rotor 200 may further include supporting portions 271 and 275 for supporting the rotating shaft 260 in a radial direction to prevent wear of the rotating shaft 260 when the rotating shaft 260 rotates.

[0127] The supporting parts 271, 275 may include: a first supporting part 271, which is located on the upper side of the shaft fixing member 250 and is used to support a part of the rotating shaft 260 protruding above the shaft fixing member 250; and a second supporting part 275, which is located on the lower side of the shaft fixing member 250 and is used to support a part of the rotating shaft 260 protruding below the shaft fixing member 250.

[0128] The supporting parts 271 , 275 may be made of a plastic material.

[0129] The rotor 200 may further include washers 281 and 285 disposed on the shaft fixing member 250. The washers 281 and 285 may include a first washer 281 disposed on the upper end of the shaft fixing member 250 and a second washer 285 disposed on the lower end of the shaft fixing member 250.

[0130] The washers 281 and 285 can prevent wear of one side of the support parts 271 and 275 due to friction with one side of the shaft fixing member 250. Since the washers 281 and 285 have smooth surfaces, even if they rub against the support parts 271 and 275, the wear of the support parts 271 and 275 can be slow.

[0131] Figure 7 is a perspective view showing the structure of a rotor according to an embodiment of the present invention. Figure 8 FIG. 1 is a diagram schematically showing the shape of the fixing protrusion of the rotor according to an embodiment of the present invention. Figure 9 This is a diagram of the rotor according to an embodiment of the present invention viewed from the front. Figure 10 It is along Figure 9 The cross-sectional view taken along the 10-10' line, Figure 11 It is a plan view showing the structure of a rotor according to an embodiment of the present invention.

[0132] Reference Figures 7 to 11 The magnet 210 of the embodiment of the present invention may have a ring shape that is through-hole from top to bottom. The magnet 210 may include: an outer peripheral surface 211 having a curved surface extending along the circumferential direction; and an inner peripheral surface 212 disposed inside the outer peripheral surface 211 and having a curved surface extending along the circumferential direction.

[0133] The magnet 210 may include a first end portion 213 forming an end surface of the magnet 210 facing the impeller 50 and a second end portion 214 forming an end portion opposite to the first end portion 213. The end surface of the first end portion 213 may be formed to be closest to the surface of the impeller 50.

[0134] The first end portion 213 extends from one side of the outer circumferential surface portion 211 of the magnet 210 toward the inner side of the magnet 210 in the radial direction and may have a ring shape. The second end portion 214 extends from the other side of the outer circumferential surface portion 211 of the magnet 210 toward the inner side of the magnet 210 in the radial direction and may have a ring shape.

[0135] by Figure 7 As a reference, it can be understood that the first end portion 213 forms the upper end portion of the magnet 210 , and the second end portion 214 forms the lower end portion of the magnet 210 .

[0136] The magnet 210 may have a shape that is symmetrical in the vertical direction. Figure 7 As a reference, even if the magnet 210 is turned upside down, the magnet 210 can be formed into the same shape.

[0137] The magnet 210 may further include a cone portion 215, which extends obliquely from the first end portion 213 toward the inner side of the radius of the magnet 210. The oblique direction of the cone portion 215 may be from the first end portion 213 toward the second end portion 214, i.e., in the direction of Figure 7 The direction of downward tilt is the reference.

[0138] The conical body 215 may also be provided on the side of the second end portion 214. Specifically, the conical body 215 may be provided so as to extend obliquely from the second end portion 214 toward the inner side of the magnet 210 in the radial direction. The conical body 215 provided on the side of the first end portion 213 may be referred to as the "first conical body," and the conical body 215 provided on the side of the second end portion 214 may be referred to as the "second conical body."

[0139] The tilt direction of the second vertebral body 215 may be from the second end portion 214 toward the first end portion 213, that is, Figure 7 The direction of the upward tilt is the reference.

[0140] The cone portion 215 may be understood as a portion that is formed to be inclined in order to prevent cracks from being generated in the magnet 210 when the magnet 210 is manufactured by compression sintering.

[0141] This is because, if the conical body portion 215 is not provided, when a larger step is formed by extending the surface vertically downward from the first end portion 213, or when a larger step is formed by extending the surface vertically upward from the second end portion 214, there is a high possibility that cracks will be generated during the stamping process of compression sintering.

[0142] The magnet 210 may further include an inner extension portion 216 extending from the cone portion 215 toward the inner side of the magnet 210 in the radial direction. The inner surface of the inner extension portion 216 may be connected to the inner circumferential surface portion 212 of the magnet 210 .

[0143] That is, the inner peripheral surface portion 212 may be formed by a surface extending downward from the innermost end portion of the inner extension portion 216 connected to the first vertebral body 215. Similarly, the inner peripheral surface portion 212 may be formed by a surface extending upward from the innermost end portion of the inner extension portion 216 connected to the second vertebral body 215.

[0144] The first end portion 213 , the first vertebral portion 215 , and the inner extension portion 216 connected to the first vertebral portion 215 may form the top portion of the magnet 210 . The second end portion 214 , the second vertebral portion 215 , and the inner extension portion 216 connected to the second vertebral portion 215 may form the bottom portion of the magnet 210 .

[0145] A fixing protrusion 220 may be provided on the inner circumferential surface portion 212 of the magnet 210 . The fixing protrusion 220 is used to firmly couple the magnet 210 and the shaft fixing member 250 .

[0146] The fixing protrusion 220 may be located closer to the inner center of the magnet 210 than the first end 213 or the second end 214 .

[0147] The fixing protrusion 220 may be provided on the vertebral body 215 or the inner extension 216. As an example, the fixing protrusion 220 may be formed across the vertebral body 215 and the inner extension 216.

[0148] The fixing protrusion 220 may protrude from the vertebral body 215. Specifically, the fixing protrusion 220 may be provided to protrude from the inclined surface of the vertebral body 215 toward the inner side in the radial direction.

[0149] The fixing protrusion 220 may include a protrusion outer peripheral surface 223, and the protrusion outer peripheral surface 223 is used to form the outer surface of the fixing protrusion 220. The protrusion outer peripheral surface 223 may have an outer surface with a predetermined curvature.

[0150] The protruding outer peripheral surface 223 may be configured to form a portion of the outer peripheral surface of a cylinder C. For example, the cylinder C has a predetermined diameter θ1 and may be defined as a shape having a height H extending from one point on the inner peripheral surface 212 of the magnet 210 to another point on the opposite side.

[0151] The cross-sectional center of the cylinder C may be defined as C1. In addition, the central axis of the cylinder C may be defined as extending from the inner circumferential surface portion 212 toward the inner side in the radial direction and passing through the center C1.

[0152] A plurality of the fixing protrusions 220 may be provided on the inner circumferential surface portion 212 of the magnet 210 , and the plurality of fixing protrusions 220 may be spaced apart along the circumferential direction.

[0153] The number of the fixing protrusions 220 may correspond to the number of poles of the magnet 210. As an example, the plurality of fixing protrusions 220 may include six fixing protrusions.

[0154] Reference Figure 11 The magnet 210 may have six poles based on the inner center Co of the ring-shaped magnet 210. The six poles may be arranged alternately with north and south poles along the circumference. Each north pole and south pole region may have a 60° area based on the inner center Co.

[0155] Each of the fixing protrusions 220 may be located within each region formed by the N pole and the S pole. As an example, the plurality of fixing protrusions 220 may include a first magnet protrusion 2201 to a sixth magnet protrusion 2206 arranged along a circumferential direction (clockwise direction).

[0156] The first magnet protrusion 2201 may be arranged to face the fourth magnet protrusion 2204, and the second magnet protrusion 2202 may be arranged to face the fifth magnet protrusion 2205. In addition, the third magnet protrusion 2203 may be arranged to face the sixth magnet protrusion 2206.

[0157] The two magnet protrusions facing each other may constitute a portion and another portion of the outer circumference of the defined cylinder C. Specifically, the protrusion outer circumferential surface portions 223 of the two magnet protrusions facing each other may overlap with a portion and another portion of the outer circumference of the cylinder C.

[0158] Since six fixing protrusions 220 are provided, three cylinders C can be defined. The three cylinders C can have outer circumferential surfaces with the same shape and the same curvature.

[0159] The innermost surface of the fixing protrusion 220 in the radial direction may form the inner circumferential surface 212. Specifically, the inner circumferential surface 212 may include: a first inner circumferential surface 212a in an annular shape; and a second inner circumferential surface 212b protruding from the first inner circumferential surface 212a to form the innermost surface of the fixing protrusion 220.

[0160] On the other hand, the inner circumferential surface 212 of the magnet 210 may include: a first inner circumferential surface 212a in a ring shape; and a second inner circumferential surface 212b, which protrudes from the first inner circumferential surface 212a toward the direction close to the first end 213 or the second end 214 and forms a surface of the fixing protrusion 220.

[0161] The fixing protrusion 220 provided on the upper side of the inner peripheral surface 212, that is, the second inner peripheral surface 212b of the upper protrusion 220a, can protrude upward from the first inner peripheral surface 212a. The fixing protrusion 220 provided on the lower side of the inner peripheral surface 212, that is, the second inner peripheral surface 212b of the lower protrusion 220b, can protrude downward from the first inner peripheral surface 212a.

[0162] The magnet 210 has a symmetrical shape in the vertical direction. Therefore, the upper protrusion 220a and the lower protrusion 220b can have the same shape and size. The upper protrusion 220a and the lower protrusion 220b can be provided in plurality and arranged along the circumference of the inner circumferential surface 212 of the magnet 210.

[0163] The plurality of upper protrusions 220a and the plurality of lower protrusions 220b may be arranged at equal intervals along the circumferential direction.

[0164] The uppermost end of the upper protrusion 220a may form a tip portion P1. The lowermost end of the lower protrusion 220b may form a tip portion P1. For ease of description, the shape and size of the fixing protrusion 220 will be described with reference to the upper protrusion 220a.

[0165] The distance from the tip P1 of the upper protrusion 220a to the lower end of the second inner circumferential surface 212b connected to the lower end of the upper protrusion 220a (i.e., the first inner circumferential surface 212a) is defined as the protrusion height H1. In addition, the distance from the first end 213 to the tip P1 is defined as the protrusion depth H2.

[0166] The tip portion P1 of the upper protrusion 220a may be formed at a lower position than the first end portion 213. That is, the distance from the tip portion P1 of the upper protrusion 220a to the upper end portion of the first inner circumferential surface 212a may be formed to be smaller than the distance from the first end portion 213 to the upper end portion of the first inner circumferential surface 212a.

[0167] This is because the shaft fixing member 250 is provided outside the upper protrusion 220 a , and if the upper protrusion 220 a protrudes above the first end portion 213 , it is difficult to stably fix the shaft fixing member 250 to the upper protrusion 220 a .

[0168] When the protrusion height H1 of the upper protrusion 220 a is constant, as the diameter θ1 of the cylinder C decreases, the function of preventing the rotating shaft 260 from idling can be improved, but the possibility of cracks being generated during the molding of the magnet 210 may increase.

[0169] In addition, when the diameter θ1 of the cylinder C is constant, as the height H1 of the upper protrusion 220a increases, the function of preventing the rotating shaft 260 from idling can be improved, but the thickness of the shaft fixing member 250 used to cover the upper protrusion 220a will be reduced, thereby possibly increasing the probability of injection molding failure of the shaft fixing member 250.

[0170] Therefore, in this embodiment, it is suggested that the protrusion height H1 be formed to be greater than the protrusion depth H2.

[0171] The description of the protrusion height H1 and protrusion depth H2 of the lower protrusion 220b refers to the description of the protrusion height H1 and protrusion depth H2 of the upper protrusion 220a. This is because, as described above, the magnet 210 has a vertically symmetrical shape.

[0172] Figure 12 1 is an upper perspective view showing the structure of the shaft fixing member according to the embodiment of the present invention. Figure 13 1 is a lower perspective view showing the structure of the shaft fixing member according to the embodiment of the present invention. Figure 14 1 is a front view showing the structure of the shaft fixing member according to the embodiment of the present invention. Figure 15 It is along Figure 5 A cross-sectional view taken along the 15-15' line.

[0173] Reference Figures 12 to 15 The shaft fixing member 250 of the embodiment of the present invention may be configured to support the magnet 210 and the rotating shaft 260 to firmly fix the magnet 210 and the rotating shaft 260 .

[0174] The shaft fixing member 250 may be formed by insert molding in a state where the magnet 210 and the rotating shaft 260 are assembled.

[0175] The shaft fixing member 250 may have a shape symmetrical in the vertical direction corresponding to the shape of the magnet 210 .

[0176] The shaft fixing member 250 may include a shaft support portion 253 that surrounds the outside of the rotating shaft 260 and has a hollow cylindrical shape; and a magnet support portion 254 that is provided to surround the outside of the shaft support portion 253 and to support the inner circumferential surface of the magnet 210. The magnet support portion 254 may have a hollow cylindrical shape.

[0177] The shaft fixing member 250 may include: a first connecting portion 255 for connecting the shaft supporting portion 253 and the magnet supporting portion 254 ; and a recessed portion 256 defined by the shaft supporting portion 253 , the magnet supporting portion 254 and two adjacent first connecting portions 255 .

[0178] The shaft fixing member 250 may further include a second connecting portion 259 , which is disposed inside the recessed portion 256 and is used to connect the shaft supporting portion 253 and the magnet supporting portion 254 , and extends radially from the shaft supporting portion 253 toward the magnet supporting portion 254 .

[0179] The shaft fixing member 250 may further include a first end support portion 257a extending radially outward from an upper end portion of the magnet support portion 254 and covering a portion of an upper end portion of the magnet 210. The first end support portion 257a may have a ring shape.

[0180] The first end support portion 257a includes a washer rib 252 for forming a space for accommodating the first washer 281. The washer rib 252 may protrude upward from the first end support portion 257a and be formed along the circumferential direction. The first washer 281 may be disposed in the inner space of the washer rib 252.

[0181] The shaft fixing member 250 may include a second end support portion 257b extending radially outward from a lower end portion of the magnet support portion 254 and covering a portion of a lower end portion of the magnet 210. The second end support portion 257b may have a ring shape.

[0182] The second end support portion 257b may be provided with the washer rib 252. The description of the washer rib 252 of the second end support portion 257b is based on the description of the washer rib 252 of the first end support portion 257a. The second washer 285 may be provided in the inner space of the washer rib 252 of the second end support portion 257b.

[0183] A jaw portion is formed at the intersection of the magnet support portion 254 and the first end support portion 257a for supporting the top portion of the magnet 210. The jaw portion may be provided with a flange portion 258a that contacts the cone portion 215 of the magnet 210. The flange portion 258a may include a surface that is inclined corresponding to the cone portion 215 of the magnet 210.

[0184] The flange portion 258a is formed with a protrusion groove 258b for supporting the fixing protrusion 220 of the magnet 210. The protrusion groove 258b can be formed by recessing at least a portion of the flange portion 258a. The fixing protrusion 220 can be accommodated within the protrusion groove 258b, so that the flange portion 258a can surround the outer side of the fixing protrusion 220.

[0185] The fixing protrusion 220 and the protrusion groove 258 b may be configured to generate a supporting force in a direction intersecting or interfering with a rotation direction of the magnet 210 and the rotating shaft 260 .

[0186] That is, since the fixing protrusion 220 is accommodated in the protrusion groove 258b, the flange portion 258a supports both sides of the fixing protrusion 220 in the circumferential direction. Therefore, when the magnet 210 and the rotating shaft 260 rotate, the flange portion 258a can rotate along the circumferential direction together with the magnet 210 and can prevent separation from the magnet 210.

[0187] A plurality of the protrusion grooves 258 b may be formed corresponding to the number of the fixing protrusions 220 of the magnet 210 , and the plurality of protrusion grooves 258 b may be formed along a circumferential direction of the flange portion 258 a .

[0188] As described above, since the shaft fixing member 250 has a symmetrical shape in the vertical direction, the flange portion 258a and the protruding groove 258b may also be provided at the intersection of the magnet support portion 254 and the second end support portion 257b.

[0189] As described above, since the structures for supporting the fixing protrusions 220 of the magnet 210 are respectively provided on the upper and lower portions of the shaft fixing member 250 , the magnet 210 and the shaft fixing member 250 can maintain a firmly coupled state.

[0190] Figure 16A and Figure 16B 1 is a schematic diagram showing that cracks may be generated during the rotor molding process when the rotor has spherical fixing protrusions.

[0191] Unlike the embodiments of the present invention, Figure 16A and Figure 16B 2 shows a problem that occurs when the fixing protrusion Pr provided on the magnet M has a shape of a portion of the outer peripheral surface of a sphere rather than a portion of the outer peripheral surface of a cylinder.

[0192] When the fixing protrusion Pr has a partial shape of the outer circumference of a sphere, the radius of curvature of the fixing protrusion Pr can be relatively small due to the geometric characteristics of the sphere. If the radius of curvature of the fixing protrusion Pr is small, the fixing protrusion Pr may bend more at its tip. In other words, the step of the fixing protrusion Pr may be larger.

[0193] When the magnet M is formed by compression sintering, a stamping process is performed, and at this time, the uniformity of the force applied by the stamping may become uneven. Figure 16B The magnitudes of the forces shown in FIG. 4 can be represented by the fact that the difference between the magnitudes of the first force F1 acting on the tip of the fixing protrusion Pr and the magnitudes of the forces ( F2 and F3 ) acting gradually approaching the center of the fixing protrusion Pr is relatively large.

[0194] Therefore, the density of the magnet M achieved during the molding of the magnet M becomes uneven, thereby increasing the possibility of cracks being generated in the magnet M.

[0195] Figure 17A and Figure 17B 1 is a schematic diagram showing that cracks may not be generated during the rotor molding process when the rotor has cylindrical fixing protrusions.

[0196] and Figure 16A and Figure 16B Different, reference Figure 17Aand Figure 17B In the embodiment of the present invention, the fixing protrusion 220 of the magnet 210 may have a shape of a portion of the outer circumference of a cylinder.

[0197] When the fixing protrusion 220 is shaped like a portion of the outer circumference of a cylinder, the curvature radius of the fixing protrusion 220 may be formed to be relatively large due to the geometric characteristics of the cylinder. If the curvature radius of the fixing protrusion 220 is formed to be large, the length of the tip portion of the fixing protrusion 220 may be formed to be relatively long toward the inner side in the radial direction.

[0198] As a result, since the length of the tip of the fixing protrusion 220 becomes longer, the uniformity of the force applied by the punching can be made uniform during the compression sintering process of the magnet M. Figure 17B In the magnitudes of the forces shown in FIG, the first to third forces F1 ′, F2 ′, and F3 ′ acting on the tip of the fixing protrusion 220 may act uniformly along the inner side in the radial direction.

[0199] Therefore, the density of the magnet 210 achieved during the molding of the magnet 210 becomes uniform, thereby reducing the possibility of cracks in the magnet 210 .

[0200] Table 1 below shows the results of an experiment conducted to determine whether motor performance changes by comparing a magnet 210 having fixing protrusions 220 in this embodiment with a control magnet having recessed grooves.

[0201] [Table 1]

[0202] distinguish Control group (depressed groove) The present invention (fixed protrusion) Back electromotive force (BEMF) 3.75 (Vms) 3.77 (Vms)

[0203] As shown in Table 1 above, by comparison with the control group, it can be seen that when the magnet of the embodiment of the present invention forms the fixing protrusion, the magnetic force of the magnet 210 becomes stronger, thereby increasing the back electromotive force (BEMF) used to represent the motor performance by about 5%.

[0204] In summary, by providing the fixing protrusion 220 on the magnet 210 and forming the protrusion groove 258b for supporting the fixing protrusion 220 on the shaft fixing member 250, the magnet 210 and the rotating shaft 260 can be firmly fixed. In addition, the number of magnets 210 is increased by the number of fixing protrusions 220, thereby increasing the magnetic force and improving the back electromotive force of the motor.

Claims

1. A motor, wherein: include: Rotation axis; a magnet disposed on the outer peripheral side of the rotating shaft and having an outer peripheral surface portion and an inner peripheral surface portion so as to have a ring shape and have a first end portion and a second end portion; and a shaft fixing member for fixing the magnet and the rotating shaft, The magnet further includes a fixing protrusion that protrudes from the inner peripheral surface portion in a direction intersecting with the rotation direction of the magnet and interferes with the shaft fixing member. The fixing protrusion includes a protrusion outer peripheral surface portion having a predetermined curvature to form a portion of the outer peripheral surface of a cylinder. The shaft fixing member is formed with a protrusion groove for accommodating the fixing protrusion. The inner peripheral surface of the magnet includes: a first inner peripheral surface portion having a ring shape; as well as The second inner peripheral surface portion extends from the first inner peripheral surface portion toward the first end portion or the second end portion and forms one surface of the fixing protrusion. A protrusion height from the first inner peripheral surface portion to a tip portion of the fixing protrusion is greater than a protrusion depth from the tip portion to the first end portion or the second end portion.

2. The motor according to claim 1, wherein The first end portion extends from one side of the outer peripheral surface portion toward the inner side in the radial direction of the magnet. The second end portion extends from the other side of the outer peripheral surface portion of the magnet toward the inner side in the radial direction of the magnet. The fixing protrusion is located closer to the inner center of the magnet than the first end or the second end.

3. The motor according to claim 1, wherein The fixing protrusion is provided so as to protrude from the first inner peripheral surface portion of the magnet toward the first end portion or the second end portion.

4. The motor according to claim 1, wherein The surface of the fixing protrusion forming the second inner peripheral surface portion forms the innermost surface of the fixing protrusion in the radial direction.

5. The motor according to claim 1, wherein The distance from the first inner peripheral surface portion to the tip portion of the fixing protrusion is smaller than the distance from the first inner peripheral surface portion to the first end portion or the second end portion, so that the fixing protrusion does not protrude outside the first end portion or the second end portion.

6. The motor according to claim 2, wherein The magnet further comprises: a cone portion extending obliquely from the first end portion toward the interior of the magnet; and The inner extension portion extends from the cone portion toward the inner side of the magnet in the radial direction.

7. The motor according to claim 6, wherein The fixing protrusion is provided on at least one of the vertebral body portion and the inner extension portion.

8. The motor according to claim 7, wherein The fixing protrusion is arranged across the vertebral body and the inner extension portion.

9. The motor according to claim 1, wherein The fixing protrusions are provided in a plurality along the circumferential direction of the inner peripheral surface of the magnet. Two fixing protrusions facing each other among the plurality of fixing protrusions overlap with a portion and another portion of the outer circumferential surface of the cylinder.

10. The motor according to claim 9, wherein The fixing protrusions are provided with six corresponding to the number of poles of the magnet. The first fixing protrusion and the fourth fixing protrusion of the six fixing protrusions constitute a part of the outer circumferential surface of the first cylinder. The second fixing protrusion and the fifth fixing protrusion of the six fixing protrusions constitute a part of the outer circumferential surface of the second cylinder. The third fixing protrusion and the sixth fixing protrusion of the six fixing protrusions constitute a portion of the outer circumferential surface of the third cylinder.

11. The motor according to claim 2, wherein The fixing protrusions are respectively provided on the inner peripheral surface side of the first end portion and the inner peripheral surface side of the second end portion.

12. The motor according to claim 6, wherein The shaft fixing member comprises: a shaft support portion supporting an outer peripheral surface of the rotating shaft to fix the rotating shaft; and The magnet support portion surrounds the shaft support portion and supports the inner peripheral surface portion of the magnet.

13. The motor according to claim 12, wherein The shaft fixing member comprises: a first end support portion extending from one side of the magnet support portion toward the outside in a radial direction and covering a portion of the first end portion of the magnet; and The second end support portion extends from the other side of the magnet support portion toward the outside in the radial direction and covers a portion of the second end portion of the magnet. The protruding groove is formed in a jaw portion formed by the magnet support portion and the first end support portion or the magnet support portion and the second end support portion.

14. The motor according to claim 13, wherein The jaw portion is provided with a flange portion having an inclined surface for supporting the vertebral body portion of the magnet. The protrusion groove is recessed and formed in the flange portion.

15. A drainage pump, wherein: include: The motor according to any one of claims 1 to 14; as well as An impeller is combined with the motor.

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