Motor assembly

Abstract

The present invention relates to a motor assembly including: a stator provided with a stator core, a stator coil wound around the stator core, and an insulator insulating the stator core and the stator coil; and a rotor disposed so as to be rotatable relative to the stator; the stator core is provided with a yoke portion, a plurality of teeth projecting radially from the yoke portion, and pole shoes extending in a circumferential direction from each end portion of the plurality of teeth to both sides; the insulator is provided with an insulator main body insulating an inner surface of the yoke portion and a peripheral surface of the teeth, and insulating an outer surface of the pole shoes in a manner that an inner side end portion of the pole shoes is exposed to the outside, and a creepage distance extension portion extending a creepage distance between the stator coil and the inner side end portion of the pole shoes; the creepage distance extension portion is provided with an inner side extension section extending in the circumferential direction from each end portion of the pole shoes, and an outer side extension section extending outward from each of the inner side extension sections.

Description

Technical Field

[0001] This invention relates to motor assemblies. Background Technology

[0002] As is well known, a motor is a device that converts electrical energy into mechanical energy.

[0003] The motor typically has a stator and a rotor, the rotor being configured relative to the stator in a rotatable manner with a predetermined air gap.

[0004] The motors come in various sizes and weights depending on their intended use.

[0005] A portion of the motor consists of a motor assembly equipped with an impeller to generate pressure or facilitate the movement of air when rotated.

[0006] On the other hand, when the size of the stator and rotor is reduced, in order to increase the air volume reduced due to the size reduction, the rotor needs to rotate at a relatively fast speed (e.g., above 100krpm).

[0007] However, for this existing motor assembly, when the size of the stator and rotor is reduced and the rotor rotates at high speed, there is a problem that it is difficult to ensure the insulation distance between the stator coil and the stator core.

[0008] In particular, motor assemblies for so-called handheld devices (e.g., hair dryers, vacuum cleaners, etc.) intended for hand-held use are limited in size and weight, and are therefore composed of miniature motor assemblies with relatively small size and weight.

[0009] However, for such existing micro motor assemblies, the reduced size makes it more difficult to ensure the insulation distance of the stator coils.

[0010] To address these issues, a motor was designed in which, for the insulation of the stator coil, a protrusion protruding from the inner side of a radially oriented slot is provided in the insulator that is coupled to the stator core.

[0011] However, for motors with protrusions in the insulator, the creepage distance between the stator coil and the stator core is increased radially by a size equivalent to the length of the protrusion by forming the protrusion, thus resulting in insufficient increase in creepage distance.

[0012] In particular, in the case of a miniature motor assembly with reduced stator and rotor dimensions, the creepage distance is limited due to the increased size of the protrusions because the radial dimension of the slots is already small.

[0013] In addition, in some existing motors, an insulation structure is designed in which insertion slots are formed in the opposite regions of the openings of the slots in the insulator. After the stator coil winding is completed, insulating paper is inserted into the insertion slots to block the openings of the slots.

[0014] However, for motors that insert insulating paper into the openings of slots in the insulator, after the stator coils are wound, the insulating paper must be inserted into the opening of each slot separately, which requires a lot of time and effort.

[0015] In addition, in some existing motors, an insulation structure is designed whereby, after the stator coil is wound, the outer surface of the stator coil is wrapped with insulating paper to insulate it.

[0016] However, for motors that use insulating paper to surround the outer surface of the stator coils, there is a problem that requires a lot of time and effort because each stator coil needs to be wrapped with the insulating paper one by one after the stator coils are wound.

[0017] On the other hand, for such existing micro motor assemblies, when configured to bond the insulator to the outer periphery of the stator core, the insulator thickness increases because it must have a structure that overlaps along the thickness direction to ensure creepage distance. This results in a significant reduction in the conductor occupancy of the stator coil wound inside the slot. In particular, the reduced conductor occupancy within the slot hinders the performance (output) of the motor assembly.

[0018] Existing technical documents

[0019] Patent documents

[0020] Patent Document 1: JP 2008-048491 A

[0021] Patent Document 2: KR 1020150027714 A

[0022] Patent Document 3: KR ​​1020120082920 A Summary of the Invention

[0023] The problem that the invention aims to solve

[0024] Therefore, the object of the present invention is to provide a motor assembly that can extend the creepage distance between the stator coil and the stator core in both the circumferential and radial directions without increasing the size of the stator in the radial direction.

[0025] Another object of the present invention is to provide a motor assembly that ensures the spacing for winding stator coils and the creepage distance of the stator coils.

[0026] Another object of the present invention is to provide a motor assembly that can reduce the thickness of the insulator to increase the internal space of the slot.

[0027] Another object of the present invention is to provide a motor assembly that can maintain the same creepage distance and can increase the spacing for winding stator coils.

[0028] Technical solutions to the problem

[0029] To address the issues described above, the motor assembly of the present invention is characterized in that the insulator insulating the stator core and the stator coil is provided with a creepage distance extension portion, which is configured to extend the creepage distance in the circumferential and outer directions of the stator core.

[0030] More specifically, the insulator includes: an insulator body that insulates the inner surface of the yoke of the stator core, the circumferential surface of the teeth, and the outer surface of the pole shoe; and a creepage distance extension that extends the creepage distance between the inner ends of the stator coil and the pole shoe. The creepage distance extension has an inner extension section extending circumferentially along the stator core and an outer extension section extending outward from the inner extension section, thereby increasing the creepage distance without increasing the radial dimension of the stator core.

[0031] In one embodiment of the invention, the motor assembly includes a stator and a rotor configured to rotate relative to the stator, the stator being formed to have an outer diameter of less than 20 mm.

[0032] In one embodiment of the present invention, the rotor is provided with a rotating shaft and a permanent magnet coupled to the rotating shaft.

[0033] In one embodiment of the present invention, an impeller is provided on the rotating shaft, an outer housing is provided on the outside of the impeller, and an inner housing is concentrically provided on the inside of the outer housing.

[0034] This embodiment is implemented as a micro motor assembly with an outer casing diameter of less than 30 mm and a stator outer diameter of less than 20 mm.

[0035] The outer surface of the inner housing is configured to be separated from the inner surface of the outer housing, and a plurality of fins are provided on the outer surface of the inner housing, one end of each fin being connected to the inner surface of the outer housing.

[0036] The stator is provided with a stator core, a stator coil wound on the stator core, and an insulator that insulates the stator core and the stator coil.

[0037] The insulator is formed from synthetic resin components.

[0038] The stator core is provided with a circular yoke, a plurality of teeth protruding radially on the inner surface of the yoke, and pole shoes extending circumferentially to both sides from each end of the plurality of teeth.

[0039] In one embodiment of the present invention, the plurality of teeth is set to three.

[0040] The stator coil has three phase coils wound on a plurality of the teeth respectively.

[0041] The three phase coils are respectively connected to each phase (U phase, V phase, W phase) of the three-phase AC power supply.

[0042] The motor assembly is provided with a printed circuit board connected to the three phase coils.

[0043] The printed circuit board can be configured to be powered by a three-phase AC power supply.

[0044] The stator coil is connected to the three-phase power supply section of the printed circuit board.

[0045] An embodiment of the present invention provides a motor assembly comprising: a stator having a stator core, a stator coil wound around the stator core, and an insulator insulating the stator core and the stator coil; and a rotor configured to rotate relative to the stator. The stator core includes: a yoke; a plurality of teeth protruding radially from the yoke; and pole shoes extending circumferentially to both sides from each end of the plurality of teeth. The insulator includes: an insulator body surrounding and insulating the inner surface of the yoke and the circumferential surface of the teeth, and surrounding and insulating the outer surface of the pole shoes such that the inner ends of the pole shoes are exposed to the outside; and a creepage distance extension extending the creepage distance between the stator coil and the inner ends of the pole shoes. The creepage distance extension includes: an inner extension section extending circumferentially from the end of the pole shoes; and an outer extension section extending outwardly from the inner extension section.

[0046] Therefore, the creepage distance between the stator coil and the stator core can be effectively increased without increasing the outer diameter of the stator and maintaining the appearance of the micro motor assembly.

[0047] In one embodiment of the present invention, the outer extension interval includes: a radial extension interval extending radially from the inner extension interval; and a circumferential extension interval extending circumferentially from the radial extension interval.

[0048] Here, the radial extension section protrudes at a position where it moves a predetermined distance circumferentially toward the tooth side from the end of the inner extension section.

[0049] Therefore, the creepage distance can be increased without increasing the radial length of the outer extended section.

[0050] In one embodiment of the present invention, the insulator body includes: a yoke insulating portion for insulating the inner surface of the yoke; a tooth insulating portion for insulating the circumferential surface of the tooth; and a pole shoe insulating portion for insulating the outer surface of the pole shoe.

[0051] The yoke insulation portion and the pole shoe insulation portion each have guides that extend further to both sides along the axial direction than the tooth insulation portion.

[0052] This allows the stator coil, which is wound around the outer periphery of the tooth insulation portion, to be suppressed from moving radially.

[0053] In one embodiment of the present invention, the insulator is injection molded by inserting it into the stator core.

[0054] Therefore, compared with assembling the insulator into the stator core, the thickness can be reduced, and the reduction in the winding space of the stator coil due to the increase in thickness can be suppressed.

[0055] In one embodiment of the invention, the inner extension section is formed to have an inner diameter that is larger than the inner diameter of the pole shoe in such a way that the end of the pole shoe protrudes by a predetermined length.

[0056] The inner end of the pole shoe is configured to protrude radially inward from the inner extension section.

[0057] Here, the end of the pole shoe, which protrudes radially inward from the inner extension section, can be used to support the stator during the insert injection molding of the stator. This enables stable support of the stator.

[0058] In one embodiment of the present invention, the insulating portion of the yoke is provided with a protrusion, the protrusion having an outer diameter that is larger than the outer diameter of the yoke; the protrusion is provided with a cut-off portion, the cut-off portion being cut to have a minimum outer diameter smaller than the outer diameter of the yoke.

[0059] Here, due to the formation of the cut-off portion, each part of the stator core that protrudes radially from the yoke insulation portion can be used to support the stator during the insert injection molding of the stator. This enables stable support of the stator.

[0060] In one embodiment of the present invention, the cut-off portion is implemented as a plurality of cut-off portions spaced apart circumferentially, each of the plurality of cut-off portions having a shape different from the shapes of the rest of the plurality of cut-off portions.

[0061] Therefore, the plurality of cut-off portions are easily identified, thereby facilitating the winding of the stator.

[0062] In one embodiment of the present invention, guide surfaces are provided at both ends of the creepage distance extension along the axial direction, and the axial length of the guide surfaces gradually decreases radially outward.

[0063] Therefore, when winding the stator coil, it is possible to prevent the conductor of the stator coil from winding around the end of the creepage distance extension along the axial direction.

[0064] In one embodiment of the present invention, the guide surface is provided with an outwardly convex arc cross section.

[0065] Therefore, when winding the stator coil, the conductor of the stator coil can move smoothly along the side of the guide facing the creepage distance extension portion for winding.

[0066] In one embodiment of the present invention, the guiding surface is provided with a linear cross section that slopes outward.

[0067] Therefore, when winding the stator coil, the conductor of the stator coil can move smoothly along the side of the guide facing the creepage distance extension portion for winding.

[0068] In one embodiment of the present invention, a connecting pin engagement portion is provided on the insulator, and the other end of a connecting pin connected to the printed circuit board is engaged with the connecting pin engagement portion.

[0069] Therefore, the connecting pin can be easily connected after the stator is injection molded.

[0070] The connecting pin is implemented with a conductive material.

[0071] Here, the end of the conductor of the stator coil is electrically connected to the connecting pin.

[0072] The conductors of the stator coil are electrically connected in a manner that allows them to conduct electricity after wrapping around the outer circumference of the connecting pin several times.

[0073] The insulator is provided with guide protrusions to guide the wire.

[0074] This enables stable support for the conductors of the stator coil, thereby suppressing the occurrence of conductor breakage.

[0075] In one embodiment of the present invention, the outer extended region is formed with an outer surface extending from the pole shoe insulation portion in a direction perpendicular to the radial direction.

[0076] Therefore, the outer surface is parallel to the stacking direction of the stator coil (wire) wrapped around the outer periphery of the tooth, thus enabling a stable stacking of the stator coil.

[0077] In one embodiment of the present invention, the ends of the inner extended section and the ends of the outer extended section are arranged on the same line.

[0078] Therefore, the interval between the inner extended intervals can be the same as the interval between the outer extended intervals.

[0079] In one embodiment of the present invention, the inner extended interval or the outer extended interval may be provided with a curved interval.

[0080] This allows for a further increase in the creepage distance between the stator coil and the stator core.

[0081] In one embodiment of the present invention, the inner extended interval and the outer extended interval are respectively curved intervals with a curved shape.

[0082] This allows for a further increase in the creepage distance between the stator coil and the stator core.

[0083] In one embodiment of the present invention, the boundary region between the inner extended interval and the outer extended interval may have a curved interval with a curved shape.

[0084] This allows for a further increase in the creepage distance between the stator coil and the stator core.

[0085] In one embodiment of the present invention, the impeller is axially disposed on one side of the inner housing inside the outer housing.

[0086] As the impeller rotates, air outside the outer housing moves along the airflow path between the inner housing and the outer housing via the impeller.

[0087] In one embodiment of the invention, the stator is configured to insert one end axially into the interior of the inner housing to a predetermined depth.

[0088] As a result, the air that moves as the impeller rotates moves along the outer surface of the stator.

[0089] In one embodiment of the present invention, a bearing assembly for rotatably supporting the rotating shaft is provided inside the inner housing.

[0090] Along the axial direction, the bearing assembly has the rotor on one side and the impeller on the other side.

[0091] The bearing assembly is disposed between the impeller and the rotor.

[0092] The bearing assembly is disposed inside the inner housing.

[0093] A bearing assembly receiving part is provided inside the inner housing to accommodate the bearing assembly.

[0094] A stator receiving portion for accommodating the stator is formed inside the inner housing.

[0095] In one embodiment of the present invention, the inner housing is provided with a through portion that extends axially.

[0096] Therefore, when the impeller rotates, air can move through the through section.

[0097] A plurality of through portions are provided along the circumference of the inner shell.

[0098] As a result, more air can move through the inner shell.

[0099] In one embodiment of the present invention, the through portion may be formed on the outside of the bearing assembly.

[0100] Therefore, the air moving through the through section can promote the cooling of the bearing assembly.

[0101] In one embodiment of the present invention, the bearing assembly comprises: an outer ring; an inner ring concentrically disposed inside the outer ring; and a plurality of balls disposed between the outer ring and the inner ring.

[0102] The bearing assembly is provided with a first bearing and a second bearing that are spaced apart along the axial direction.

[0103] Therefore, it is possible to suppress the occurrence of lateral displacement of the rotating shaft.

[0104] A spacer is provided between the first bearing and the second bearing.

[0105] Therefore, the first bearing and the second bearing can stably maintain a preset interval.

[0106] Invention Effects

[0107] As described above, according to an embodiment of the present invention, the insulator is provided with a creepage distance extension portion that extends the creepage distance between the stator coil and the stator core. The creepage distance extension portion is provided with an inner extension section extending circumferentially from both ends of the pole shoe and an outer extension section extending outward from the inner extension section, thereby increasing the creepage distance without increasing the radial dimension of the stator core.

[0108] In addition, the outer extension interval is provided with a radial extension interval extending radially from the inner extension interval and a circumferential extension interval extending circumferentially from the radial extension interval, thereby increasing the creepage distance while suppressing the increase in radial dimension.

[0109] In addition, the insulator is inserted into the stator core and injection molded, which reduces the thickness of the insulator and increases the winding space of the stator coil.

[0110] In addition, the inner extension section is provided with an inner diameter that is larger than the inner diameter of the pole shoe, so that the stator core can be easily supported during insert injection molding.

[0111] In addition, the yoke insulation portion is provided with a plurality of cut-out portions having a minimum outer diameter smaller than that of the yoke, thereby enabling easy support of the stator core during embedded injection molding.

[0112] In addition, any one of the plurality of cut sections can be configured in a different shape so that it can be easily identified for easy winding of the stator coil.

[0113] In addition, the creepage distance extension has guide surfaces at both ends along the axial direction, with the axial length decreasing radially outward, which makes it easy to wind the stator coil.

[0114] In addition, the insulator is provided with guide protrusions to guide the conductors of the stator coil, thereby stably supporting the conductors of the stator coil and suppressing the occurrence of conductor breakage.

[0115] In addition, the outer extension section extends from the pole shoe insulation portion in a direction perpendicular to the radial direction, thereby enabling the stator coil to be easily wound around the outer periphery of the tooth (tooth insulation portion).

[0116] In addition, the outer or inner extended section is provided with a curved section, which can effectively increase the creepage distance.

[0117] In addition, the outer extended section is configured to have an inclined section that is tilted relative to the radial direction, thereby effectively increasing the creepage distance.

[0118] In addition, by inserting one end of the stator into one end of the inner housing to a predetermined depth, the axial length of the motor assembly can be shortened, and the concentricity of the inner housing and the stator can be effectively maintained.

[0119] In addition, an impeller is provided on the outer side of the inner housing, and a bearing assembly for rotating the rotor shaft is provided inside the inner housing, thereby enabling the impeller and rotor to rotate smoothly. Attached Figure Description

[0120] Figure 1 This is a perspective view of a motor assembly according to an embodiment of the present invention.

[0121] Figure 2 yes Figure 1 A longitudinal section view of the motor assembly.

[0122] Figure 3 yes Figure 1 An exploded perspective view of the motor assembly.

[0123] Figure 4 yes Figure 1 A three-dimensional view of the stator coil before winding.

[0124] Figure 5 yes Figure 4 Side view of the stator.

[0125] Figure 6 The diagram is an exploded view used for illustration. Figure 4 A diagram showing the structure of the stator core and insulator.

[0126] Figure 7 yes Figure 5 Plan view of the stator.

[0127] Figure 8 yes Figure 4 A bottom-view stereoscopic view of the stator.

[0128] Figure 9 yes Figure 8 The bottom view of the stator.

[0129] Figure 10 yes Figure 7 A sectional view of the stator along line XX.

[0130] Figure 11 yes Figure 7 A cross-sectional view of the stator along line XⅠ-XⅠ.

[0131] Figure 12 It is used to explain in Figure 4 A diagram showing the winding process of the stator coil in the stator.

[0132] Figure 13 yes Figure 12 Plan view of the stator.

[0133] Figure 14It is used to explain in Figure 4 The diagram shows the connection method of the wires after the stator coil is wound on the stator core.

[0134] Figure 15 This is a diagram illustrating a portion of the stator of a motor assembly according to another embodiment of the present invention.

[0135] Figure 16 yes Figure 15 A partial sectional view.

[0136] Figure 17 yes Figure 15 A variation of the stator.

[0137] Figure 18 It is Figure 6 The enlarged illustration shows the extended creepage distance section.

[0138] Figure 19 yes Figure 18 A modified example of the creepage distance extension.

[0139] Figure 20 yes Figure 18 A modified example of the creepage distance extension.

[0140] Figure 21 yes Figure 18 A modified example of the creepage distance extension.

[0141] Figure 22 yes Figure 18 A modified example of the creepage distance extension.

[0142] Figure 23 This is a plan view of the stator core before winding the stator coil of a motor assembly according to another embodiment of the present invention.

[0143] Figure 24 yes Figure 23 Enlarged view of the extended creepage distance section.

[0144] Figure 25 yes Figure 24 A modified example of the creepage distance extension. Detailed Implementation

[0145] The embodiments disclosed in this specification will now be described in detail with reference to the accompanying drawings. Throughout this specification, similar structural elements are given the same or similar reference numerals even in different embodiments, and their description is based on the initial description. Unless the context clearly indicates otherwise, the singular expressions used in this specification include the plural expressions. Furthermore, in describing the embodiments disclosed in this specification, detailed descriptions of well-known technologies are omitted when it is determined that a detailed explanation of these technologies would obscure the essence of the disclosed embodiments. It should also be noted that the accompanying drawings are only used to facilitate understanding of the embodiments disclosed in this specification, and the technical ideas disclosed in this specification are not limited to the drawings.

[0146] Figure 1 This is a perspective view of a motor assembly according to an embodiment of the present invention. Figure 2 yes Figure 1 Longitudinal cross-sectional view of the motor assembly. Figure 3 yes Figure 1 An exploded perspective view of the motor assembly. (See image below.) Figures 1 to 3 The motor assembly described in this embodiment is provided with a stator 150 and a rotor 210.

[0147] The stator 150 is provided with: a stator core 160; a stator coil 170, which is wound around the stator core 160; and an insulator 180, which insulates the stator core 160 and the stator coil 170.

[0148] A rotor receiving hole 1607 is formed through the interior of the stator core 160, and the rotor 210 is rotatably received in the rotor receiving hole 1607.

[0149] A plurality of teeth 1604 and grooves 1605 are alternately formed on the outer periphery of the rotor receiving hole 1607.

[0150] The stator core 160 can be formed by stacking a plurality of electrical steel plates 161 in an insulating layer. Each of the plurality of electrical steel plates 161 has a rotor receiving hole 1607 formed in the center, and the teeth 1604 and the slots 1605 are alternately formed on the outer periphery of the rotor receiving hole 1607.

[0151] For example, the stator coil 170 can be connected to a three-phase AC power supply.

[0152] For example, the stator coil 170 may be provided with a plurality of phase coils 1701 connected to each phase (U phase, V phase, W phase) of the three-phase AC power supply.

[0153] The insulator 180 may be disposed between the stator core 160 and the stator coil 170.

[0154] The insulator 180 is provided with: an insulator body 181, which can insulate the stator core 160; and a creepage distance extension 190, which protrudes from the insulator body 181 and extends (increases) the creepage distance between the stator core 160 and the stator coil 170.

[0155] A printed circuit board (PCB) 250 is provided on one side (lower side in the figure) of the stator 150. The stator 150 and the PCB 250 are electrically connected. Power can be supplied to the stator 150 via the PCB 250.

[0156] For example, the printed circuit board 250 is provided with: a substrate 2501 having circuitry, and a plurality of connecting pins 2502 connected to the substrate 2501. The printed circuit board 250 is also provided with connectors 2503 capable of electrically connecting to different electrical components (e.g., an inverter).

[0157] In this embodiment, the electrical components (e.g., inverters) connected to the printed circuit board 250 to supply power can be configured to be connected to a household (220V) power supply.

[0158] In this embodiment, the creepage distance extension 190 meets the creepage distance standard that complies with the safety design standard for household 220V voltage.

[0159] The substrate 2501 is provided with a connecting pin insertion part 25011 for inserting the connecting pin 2502.

[0160] In this embodiment, there are six connecting pins 2502, and each connecting pin 2502 can be connected to both ends of each phase coil 1701 of the stator coil 170.

[0161] The connecting pin 2502 is formed of a conductor.

[0162] One end of the connecting pin 2502 is connected to one end of the stator 150 (the lower end in the figure), and the other end is connected to the printed circuit board 250.

[0163] The connecting pin 2502 is configured to be of a length that allows the stator 150 to be separated from the printed circuit board 250 by a predetermined distance.

[0164] The connecting pin insertion part 25011 is provided in six parts.

[0165] The connecting pins 2502 connected to one end of each phase coil 1701 are respectively connected to each phase (U phase, V phase, W phase) of the power supply, and the connecting pins 2502 connected to the other end of each phase coil 1701 can be electrically connected to each other. The substrate 2501 of the printed circuit board 250 may be provided with a neutral line (pattern) for simultaneously connecting (Y-connecting) one end of each of the three phase coils 1701.

[0166] The rotor 210 is rotatably housed inside the stator 150.

[0167] For example, the rotor 210 may be provided with a rotating shaft 211 and a permanent magnet 212 coupled to the rotating shaft 211.

[0168] The permanent magnet 212 is cylindrical in shape with a predetermined outer diameter. The outer diameter of the permanent magnet 212 can be 5.8 to 6.6 mm.

[0169] The stator 150 and the rotor 210 are joined together with a pre-set air gap (G).

[0170] A rotating shaft hole is formed in the center of the permanent magnet 212, into which the rotating shaft 211 can be inserted.

[0171] The rotating shaft hole is formed through the shaft along the axial direction.

[0172] The permanent magnet 212 has different magnetic poles (N pole and S pole) arranged circumferentially.

[0173] The rotating shaft 211 is longer than the permanent magnet 212.

[0174] An impeller 130 is provided on the rotating shaft 211.

[0175] The impeller 130 rotates around the rotating shaft 211.

[0176] For example, the impeller 130 is provided with a hub 1301 and a plurality of blades 1302 disposed on the outer periphery of the hub 1301.

[0177] An outer casing 110 is provided on the outside of the impeller 130.

[0178] The outer casing 110 is cylindrical in shape.

[0179] An inner housing 120 is provided inside the outer housing 110.

[0180] The impeller 130 and the inner housing 120 are disposed inside the outer housing 110.

[0181] The impeller 130 and the inner housing 120 are configured to be axially spaced apart.

[0182] The inner housing 120 has an outer surface that is smaller in size than the inner surface of the outer housing 110.

[0183] The inner housing 120 and the outer housing 110 are concentrically arranged.

[0184] An airflow path 115 is formed between the outer housing 110 and the inner housing 120.

[0185] A plurality of vanes 117 are provided between the inner housing 120 and the outer housing 110.

[0186] The plurality of blades 117 are arranged circumferentially to divide the airflow path 115 into a plurality of paths.

[0187] One side of each of the plurality of winglets 117 is connected to the inner housing 120, and the other side is connected to the outer housing 110.

[0188] In this embodiment, the motor assembly can be implemented as, for example, a micro motor assembly in which the outer diameter of the outer housing 110 is configured to be less than 30 mm and the outer diameter of the stator 150 is configured to be less than 20 mm. This significantly reduces the overall size and weight of the motor assembly. More specifically, for example, in this embodiment, it is implemented as a micro motor assembly in which the outer diameter of the outer housing 110 is 28 mm, the outer diameter of the stator core 160 is 17.5 mm, and the outer diameter of the permanent magnet 212 is 6.2 mm.

[0189] The motor assembly of this embodiment, implemented with such a miniature motor assembly, can be installed in a handheld device for handheld use, such as a hair dryer. The motor assembly of this embodiment has a small external size and light weight, thus reducing the installation space of the motor assembly inside the hair dryer and suppressing the weight increase caused by installing the motor assembly, thereby relatively reducing the size and weight of the hair dryer. This makes the manufacture and use (operation) of the hair dryer easier.

[0190] For example, the permanent magnet 212 is axially coupled to one end of the rotating shaft 211 (the lower end in the figure).

[0191] An impeller 130 is provided at the other end (upper end in the figure) of the rotating shaft 211.

[0192] For example, the impeller 130 can be configured to draw in air axially and discharge air axially.

[0193] In this embodiment, the rotor 210 can be configured to rotate at high speed (e.g., 120 to 185 KRPM). Thus, although the motor assembly is configured as a micro motor assembly with relatively small and lightweight dimensions, it can still rotate at high speed, thereby providing sufficient airflow.

[0194] For example, the impeller 130 may be configured with a hub 1301 and a plurality of blades 1302 disposed on the outer periphery of the hub 1301.

[0195] For example, the impeller 130 can be formed from a synthetic resin component.

[0196] For example, such as Figure 2 As shown, a reinforcing member 1303 may be provided on the hub 1301. The reinforcing member 1303 may be formed of a metal component to increase inertia.

[0197] More specifically, for example, the hub 1301 is formed by inserting the reinforcing member 1303 and injecting molten synthetic resin components into a mold.

[0198] The rotating shaft 211 may have a bearing assembly 215 disposed axially between the impeller 130 and the rotor 210.

[0199] For example, the bearing assembly 215 may be provided with: a first bearing 216 and a second bearing 217 spaced apart from each other along the axial direction, and a spacer 218 inserted between the first bearing 216 and the second bearing 217.

[0200] For example, the first bearing 216 and the second bearing 217 are implemented as ball bearings.

[0201] The first bearing 216 and the second bearing 217 are respectively provided with: an outer ring 219; an inner ring 220, which are concentrically arranged inside the outer ring 219; and a plurality of balls 221, which are arranged between the outer ring 219 and the inner ring 220.

[0202] For example, the spacer 218 is cylindrical. One end of the spacer 218 contacts the first bearing 216, and the other end contacts the second bearing 217. Thus, the first bearing 216 and the second bearing 217 can be arranged axially at a predetermined distance.

[0203] In this embodiment, the rotating shaft 211 may be provided with: a permanent magnet coupling portion 2111, in which the permanent magnet 212 is coupled; a bearing assembly coupling portion 2112, in which the bearing assembly 215 is coupled; and an impeller coupling portion 2113, in which the impeller 130 is coupled.

[0204] The bearing assembly joint 2112 may have an expanded outer diameter compared to the permanent magnet joint 2111 and the impeller joint 2113.

[0205] Therefore, the occurrence of lateral displacement of the rotating shaft 211 can be suppressed.

[0206] A bearing assembly receiving portion 1202 capable of accommodating the bearing assembly 215 is formed inside the inner housing 120.

[0207] A stator receiving portion 1201 is formed in the inner housing 120 so that the stator 150 can be inserted to a predetermined depth.

[0208] The stator housing 1201 may be formed at one end of the inner housing 120 (the lower end in the figure).

[0209] The stator receiving portion 1201 is disposed on one side (lower side in the figure) of the bearing assembly receiving portion 1202.

[0210] For example, the stator receiving portion 1201 communicates with the bearing assembly receiving portion 1202 and expands radially.

[0211] For example, the stator receiving portion 1201 may be provided with a stator core engaging portion 12011 for the stator core 160 to be inserted and engaged, and an insulator receiving portion 12012 for accommodating one end (the upper end in the figure) of the insulator 180. The insulator receiving portion 12012 is axially disposed above the stator core engaging portion 12011. The insulator receiving portion 12012 has an inner diameter that is smaller than that of the stator core engaging portion 12011.

[0212] On the other hand, the impeller 130 and the inner housing 120 can be configured to overlap each other axially.

[0213] A recess 1304 may be formed on the back side of the impeller 130 for the front end of the inner housing 120 to be inserted.

[0214] Thus, the impeller 130 and the inner housing 120 overlap each other axially, thereby reducing the axial length of the motor assembly.

[0215] Based on this structure, the motor assembly of this embodiment is a small structure with a radially and longitudinally reduced external dimensions.

[0216] The inner housing 120 is provided with an insertion part 1204 that is inserted into the recess 1304.

[0217] The inner housing 120 is provided with a plurality of through portions 1203 extending axially to allow air to move axially.

[0218] The plurality of through portions 1203 are configured to communicate with the stator receiving portion 1201.

[0219] According to this structure, when the impeller 130 rotates, air outside the outer housing 110 is drawn into the interior of the outer housing 110 and moves axially downstream via the impeller 130 through the airflow path 115 formed on the downstream side of the impeller 130.

[0220] On the other hand, if the impeller 130 rotates, the downstream side of the blades 1302 of the impeller 130 becomes a negative pressure state lower than atmospheric pressure. Therefore, the air in the plurality of through-holes 1203 of the inner housing 120 merges with the air moving due to the impeller 130 after moving between the inner housing 120 and the impeller 130, and thus moves downstream along the air flow path 115.

[0221] Thus, air is drawn in between the stator 150 and the printed circuit board 250, and the drawn-in air contacts the stator 150 and the rotor 210, thereby cooling the stator 150 and the rotor 210. Afterwards, the air moves through the plurality of through-holes 1203 after moving to the stator receiving portion 1201. This facilitates the cooling of the bearing assembly 215.

[0222] According to this structure, although the heat generated by the bearing assembly 215 increases during high-speed rotation, the motor assembly of this embodiment promotes the cooling of the bearing assembly 215 by the air passing through the through-hole 1203, allowing the bearing assembly 215 to operate at a relatively low temperature. This significantly suppresses forced wear of the bearing assembly 215 caused by high temperatures, thereby extending the service life of the bearing assembly 215.

[0223] Figure 4 yes Figure 1 A three-dimensional view of the stator coils before winding. Figure 5 yes Figure 4 Side view of the stator Figure 6 The diagram is an exploded view used for illustration. Figure 4 A diagram showing the structure of the stator core and insulator. (See diagram for example.) Figures 4 to 6 As shown, the insulator 180 can be manufactured by injection molding a synthetic resin component.

[0224] Although not specifically illustrated in the accompanying drawings, the insulator 180 can be formed by inserting the stator core 160 into the interior of the injection mold.

[0225] The stator core 160 is provided with: a yoke 1602; a plurality of teeth 1604 protruding from the inner surface of the yoke 1602; and pole shoes 1606 extending circumferentially to both sides from each end of the plurality of teeth 1604.

[0226] The yoke 1602 can be in the form of a ring.

[0227] A plurality of grooves 1603, recessed radially inward and extending axially, may be formed on the outer surface of the yoke 1602. For example, the plurality of grooves 1603 may be configured to be circumferentially spaced at equal intervals. For example, the circumferential center of the plurality of grooves 1603 may be formed corresponding to the center of the tooth 1604. The centers of the plurality of grooves 1603 may be located on a connecting line connecting the center of the tooth 1604 and the center of the stator core 160.

[0228] A plurality of radially protruding and circumferentially spaced teeth 1604 are provided on the inner surface of the yoke 1602. For example, three teeth 1604 are provided. A groove 1605 is formed between two circumferentially consecutive teeth 1604. Three grooves 1605 are provided. The teeth 1604 and grooves 1605 are arranged alternately with each other circumferentially.

[0229] At each end of the plurality of teeth 1604, a circumferentially extending pole shoe 1606 is formed. The pole shoe 1606 may be generally arc-shaped. The inner ends 16061 of the pole shoe 1606 are arranged on the same circumference. The pole shoe 1606 may be configured such that its radial thickness gradually decreases circumferentially. The inner ends 16061 of the pole shoe 1606 form a rotor receiving hole 1607 capable of rotatably accommodating the rotor 210. The pole shoes 1606 may be formed with a predetermined circumferential spacing. Thus, the groove 1605 can communicate with the rotor receiving hole 1607.

[0230] Here, the pre-set interval along the circumference of the pole shoes 1606 is preferably 2.0 mm. If the interval of the pole shoes 1606 exceeds 2.0 mm, the torque (performance) may be reduced when the same input current is applied.

[0231] The insulator 180 is provided with: an insulator body 181 that surrounds the inner surface of the yoke 1602 and the circumferential surface of the tooth 1604 to insulate them, and surrounds the outer surface of the pole shoe 1606 in such a way that the inner end 16061 of the pole shoe 1606 is exposed to the outside to insulate it; and a creepage distance extension 190 that extends the creepage distance between the stator coil 170 and the inner end 16061 of the pole shoe 1606.

[0232] The insulator body 181 is provided with a yoke insulation portion 1811 that insulates the inner surface of the yoke portion 1602.

[0233] The insulator body 181 is provided with a tooth insulation portion 1812 that insulates the circumferential surface of the tooth 1604.

[0234] The insulator body 181 is provided with a pole shoe insulation portion 1813 that insulates the outer surface of the pole shoe 1606.

[0235] The insulating portion 1811 of the yoke is cylindrical in shape.

[0236] The insulating portion 1811 of the yoke can be formed as an inner surface surrounding the yoke 1602.

[0237] The tooth insulation portion 1812 can be configured to surround the peripheral surface (upper surface, bottom surface, and two side surfaces) of the tooth 1604.

[0238] The pole shoe insulation portion 1813 can be configured to surround the outer side surface of the pole shoe 1606 along the radial direction of the stator 150. The pole shoe insulation portion 1813 is configured to surround the upper surface, bottom surface, and both sides of the pole shoe 1606.

[0239] In this embodiment, the pole shoe insulation portion 1813 can be formed such that the inner end portion 16061 of the pole shoe 1606 protrudes radially by a predetermined length (see reference). Figure 7 Thus, the pole shoe 1606 allows its inner end face, upper face, bottom face, and two side faces to be exposed outside the pole shoe insulation portion 1813 by the predetermined length.

[0240] The yoke insulation portion 1811 may be configured to have external guides 18111 each protruding axially from the tooth insulation portion 1812 (see reference). Figure 5 ).

[0241] The pole shoe insulation portion 1813 may be configured to have internal guides 18131 that each protrude axially from the tooth insulation portion 1812.

[0242] This prevents the stator coil 170, which is wound around the outer periphery of the tooth insulation portion 1812, from radially disengaging (moving).

[0243] A connecting pin engagement portion 18113 is provided at one end (lower end in the figure) of the yoke insulating portion 1811 to engage the connecting pin 2502.

[0244] Each of the connecting pin joints 18113 can be formed to protrude axially from the lower end of the yoke insulating portion 1811.

[0245] The yoke insulation portion 1811 may be configured to have a protrusion 18112 that protrudes radially outward from the stator core 160. The protrusion 18112 has an outer diameter that is expanded compared to the outer diameter of the stator core 160.

[0246] For example, the protrusion 18112 is provided with a cutting portion 18114 that is cut inward in a manner smaller than the outer diameter of the stator core 160 (see reference). Figure 9 ).

[0247] For example, the interception section 18114 can be provided in three forms.

[0248] In this embodiment, the case where the interception section 18114 is provided in three parts is illustrated, but it is not limited thereto.

[0249] The cut-off portion 18114 may be formed at a position corresponding to the groove 1605 in the circumferential direction.

[0250] The cutting portion 18114 can be formed circumferentially between the teeth 1604 and the teeth 1604.

[0251] The creepage distance extension 190 may be formed to protrude outward from the pole shoe insulation portion 1813.

[0252] The creepage distance extension 190 may be provided with: an inner extension section 191, which extends circumferentially from the end of the pole shoe 1606; and an outer extension section 192, which extends outward from the inner extension section 191.

[0253] Here, the end of the creepage distance extension 190 can be formed to be separated from the yoke insulation portion 1811 by a predetermined interval.

[0254] Considering the wire diameter (e.g., 0.12 to 0.18 mm) of the conductor 1702 of the stator coil 170 wound around the outer periphery of the tooth insulation portion 1812, the predetermined interval between the end of the creepage distance extension portion 190 and the yoke insulation portion 1811 can be set to a degree to which the conductor 1702 can be smoothly inserted (e.g., about 1.0 mm).

[0255] In this embodiment, the pole shoe 1606 protrudes radially inward from the pole shoe insulation portion 1813 by a predetermined length, and the yoke insulation portion 1811 is provided with a cut-off portion 18114 cut to a size smaller than the outer diameter of the stator core 160, so that the stator core 160 can be easily supported when it is inserted into the stator core 160 for injection molding.

[0256] Reference Figure 6The cutting portion 18114 is provided with a cutting portion forming portion (mold, not shown) for forming the cutting portion 18114, thereby supporting the lower outer side surface of the stator core 160. The pole shoe 1606 is provided with a pole shoe insulation portion forming portion (mold, not shown) for forming the pole shoe insulation portion 1813, thereby supporting the inner end portion 16061 of the pole shoe 1606.

[0257] Here, the protrusion length of the pole shoe 1606 protruding from the inner diameter of the pole shoe insulation portion 1813 is preferably 0.2 mm.

[0258] The minimum outer diameter of the cut-off portion 18114, which is reduced compared to the outer diameter of the stator core 160, can preferably be formed to be 0.35 mm smaller than the outer diameter of the stator core 160.

[0259] Figure 7 yes Figure 5 A plan view of the stator. Figure 8 yes Figure 4 A bottom-view stereoscopic view of the stator. Figure 9 yes Figure 8 A bottom view of the stator. (e.g.) Figures 7 to 9 As shown, the yoke 1602 of the stator 150 is configured in a ring shape, and the insulating part 1811 of the yoke can be cylindrical on the inner side of the yoke 1602.

[0260] A tooth insulating portion 1812 is formed on the inner side of the yoke insulating portion 1811, which surrounds the circumferential surface of the tooth 1604 and insulates it.

[0261] A pole shoe insulation portion 1813 is formed extending from the tooth insulation portion 1812 to insulate the pole shoe 1606.

[0262] The yoke insulating part 1811, the tooth insulating part 1812, and the pole shoe insulating part 1813 are integrally connected.

[0263] According to this structure, compared with the insulators of the prior art that are configured for axial assembly, by integrally forming the yoke insulation 1811, the tooth insulation 1812, and the pole shoe insulation 1813 of this embodiment, it is not necessary to increase the thickness for forming the assembly structure, thereby reducing the thickness. As a result, the space (slot 1605) formed inside the yoke 1602, tooth 1604, and pole shoe 1606 for winding the stator coil 170 can be substantially increased. Consequently, the ratio (occupancy) of the cross-sectional area of ​​the conductor (wire 1702) of the stator coil 170 to the cross-sectional area of ​​the slot 1605 can be increased.

[0264] The inner end portion 16061 of the pole shoe 1606 protrudes radially from the inner surface of the pole shoe insulation portion 1813.

[0265] A protrusion 18112 is formed on the outer side of the yoke 1602, and a plurality of circumferentially spaced cut-off portions 18114 are formed on the protrusion 18112.

[0266] A creepage distance extension 190 is formed in the pole shoe insulation portion 1813, which can extend the creepage distance between the stator coil 170 (phase coil 1701) wound around the outer periphery of the tooth insulation portion 1812 and the stator core 160 (inner end 16061 of pole shoe 1606) exposed from the pole shoe insulation portion 1813.

[0267] The creepage distance extension 190 is provided with an inner extension section 191 extending circumferentially from the end of the pole shoe 1606 and an outer extension section 192 extending outward from the inner extension section 191, and is in a roughly "U" shape.

[0268] Therefore, the creepage distance between the stator coil 170 and the stator core 160 can be extended (increased) without increasing the radial dimension of the stator 150.

[0269] In this embodiment, the inner extension section 191 has an inner diameter that expands beyond the inner diameter of the inner end portion 16061 of the pole shoe 1606 in such a way that the inner end portion 16061 of the pole shoe 1606 can protrude.

[0270] The outer extension section 192 is provided with a radial extension section 193 extending radially outward from the outer surface of the inner extension section 191 and a circumferential extension section 194 extending circumferentially from the radial extension section 193.

[0271] More specifically, the inner extension section 191 is provided with: a first section 1911, extending circumferentially from the inner end 16061 of the pole shoe 1606; a second section 1912, extending radially from the first section 1911 by bending; and a third section 1913, extending circumferentially from the second section 1912 by bending.

[0272] Here, the first interval 1911, the second interval 1912, and the third interval 1913 of the inner extended interval 191 can be presented as a roughly linear shape (straight line).

[0273] Here, the inner extension intervals 191 can be formed circumferentially spaced apart from each other to form a gap that allows the nozzle 172, which is wound around the stator coil 170 on the outer periphery of the tooth insulation portion 1812, to be inserted in a manner that allows relative movement.

[0274] For example, the nozzle 172 is preferably 0.9 mm wide, and the interval between the inner extension sections 191 is 1.2 mm.

[0275] The radially extended section 193 is formed by curving outwards radially from the third section 1913.

[0276] Here, the radially extended interval 193 can be formed as a generally linear shape.

[0277] The circumferential extension interval 194 may be provided with: a first interval 1941, which bends from the radial extension interval 193 and extends circumferentially; a second interval 1942, which bends from the first interval 1941 and extends radially outward; and a third interval 1943, which bends from the second interval 1942 and extends circumferentially.

[0278] Here, the first interval 1911, the second interval 1942, and the third interval 1943 of the circumferentially extended interval 194 can be presented as a roughly linear shape (straight line).

[0279] The circumferentially extended intervals 194 can be formed to be spaced apart from each other circumferentially, so as to form a gap in which the nozzle 172, which is wound around the stator coil 170 on the outer periphery of the tooth insulation portion 1812, can be inserted in a manner that allows relative movement.

[0280] like Figure 8 and Figure 9 As shown, a plurality of connecting pin engagement portions 18113 are provided on the insulator 180 (yoke insulation portion 1811) for engagement of the connecting pin 2502.

[0281] The plurality of connecting pin joints 18113 can be respectively formed to protrude axially at the lower end of the protrusion 18112.

[0282] The connecting pin joint 18113 is formed correspondingly to each phase coil 1701.

[0283] The connecting pin joint 18113 can be formed in two in each phase coil 1701.

[0284] Each connecting pin 2502 is inserted into a recessed connecting pin receiving hole 181131 at the connecting pin engagement portion 18113.

[0285] The connecting pin engagement portion 18113 can be formed on both sides of the tooth 1604 in the circumferential direction.

[0286] The insulator 180 is provided with a plurality of guide protrusions 18115, which respectively guide the wires 1702 of the stator coil 170 (phase coil 1701) that are electrically connected to the connecting pin 2502.

[0287] For example, the plurality of guide protrusions 18115 are respectively disposed on the inner side of the connecting pin joint 18113.

[0288] The plurality of guide protrusions 18115 are configured to protrude radially inward from the yoke insulating portion 1811.

[0289] In this embodiment, for example, the guide protrusion 18115 may be formed as a curved surface with its outer surface facing outwards. More specifically, for example, the outer surface of the guide protrusion 18115 may be provided with cross-sections that protrude along the axial and circumferential directions, respectively.

[0290] Therefore, damage to the conductor 1702 that occurs when in contact with the conductor 1702 of the stator coil 170 can be suppressed.

[0291] The protrusion 18112 of the insulator 180 is provided with an outer diameter that is expanded compared to the outer diameter of the stator core 160, and the protrusion 18112 is provided with a plurality of cut-out portions 18114 cut out to have a minimum outer diameter smaller than the outer diameter of the stator core 160.

[0292] The plurality of cut-off portions 18114 are respectively provided with two radially arranged side wall portions 181142 and a recessed bottom portion 181141 connecting the two side wall portions 181142.

[0293] The plurality of interception units 18114 are provided as three.

[0294] Any one of the three cut-out portions 18114 can be of a different shape than the other two cut-out portions 18114. This makes the three cut-out portions 18114 easily identifiable, thereby facilitating easy connection between the stator coil 170 (phase coil 1701) wound around the outer periphery of each tooth 1604 and the printed circuit board 250. In this embodiment, an example is shown where the cut-out portions 18114 are configured to be differentiated based on the tilt angle of the two side wall portions 181142.

[0295] Figure 10 yes Figure 7 A cross-sectional view of the stator along line XX. Figure 11 yes Figure 7 A cross-sectional view of the stator along line XⅠ-XⅠ. (See attached image.) Figure 10and Figure 11 As shown, a yoke insulation portion 1811 is formed on the inner side of the yoke portion 1602 of the stator core 160, which forms a cylindrical shape. The yoke insulation portion 1811 has a generally cylindrical shape, and is provided with external guide members 18111 extending axially to both sides of the yoke portion 1602. The external guide members 18111 are cylindrical in shape.

[0296] In the figure, a protrusion 18112 protrudes outward compared to the yoke 1602 at the lower part of the yoke insulation portion 1811. A cut-off portion 18114 is formed in the protrusion 18112, having a minimum outer diameter smaller than the outer diameter of the stator core 160. At the lower end of the protrusion 18112, the connecting pin engagement portion 18113 protrudes downward. Guide protrusions 18115 for guiding the wires 1702 of the stator coil 170 are respectively provided on the inner side of the connecting pin engagement portion 18113.

[0297] A toothed insulating portion 1812 is formed on the inner side of the yoke insulating portion 1811.

[0298] On the inner side of the radially arranged tooth insulation portion 1812, a pole shoe insulation portion 1813 is formed to insulate the pole shoe 1606 by exposing the inner end 16061 of the pole shoe 1606.

[0299] The pole shoe insulation portion 1813 is provided with an inner guide 18131 extending axially from the tooth 1604 (pole shoe 1606) to both sides. The inner guide 18131 has an arcuate shape that protrudes outward from the center. The pole shoe insulation portion 1813 has an arcuate shape that protrudes outward from the radial direction and an arcuate shape that protrudes outward from the center along the axial direction.

[0300] A creepage distance extension 190 protruding from the outer surface of the pole shoe insulation portion 1813 is formed thereon.

[0301] In this embodiment, both ends of the creepage distance extension 190 along the axial direction can protrude from the tooth 1604 by a predetermined length. Here, the predetermined length of both ends of the creepage distance extension 190 from the tooth insulation portion 1812 can be set to, for example, 2.5 mm.

[0302] At both ends of the creepage distance extension 190 along the axial direction, there are guide surfaces 1901 formed with an axial length that gradually decreases radially outward.

[0303] Therefore, when the stator coil 170 is wound around the outer periphery of the tooth insulation portion 1812, it is possible to prevent the conductor 1702 of the stator coil 170 from being wound around the end face of the creepage distance extension portion 190.

[0304] Here, if the conductor 1702 of the stator coil 170 is wound approximately 200 turns or more around the outer periphery of the tooth insulation portion 1812, it is possible that the conductor 1702 is wound through both end faces of the creepage distance extension portion 190 along the axial direction. If the conductor 1702 remains in contact with the end of the creepage distance extension portion 190, the occurrence of cracks and / or damage to the conductor 1702 in contact with the end may increase.

[0305] In this embodiment, the creepage distance extension 190 is provided with the guide surface 1901, which can suppress the conductor 1702 of the stator coil 170 from winding around the end face of the creepage distance extension 190. As a result, the occurrence of cracks and / or damage to the conductor 1702 caused by contact with the end face of the creepage distance extension 190 can be suppressed.

[0306] For example, such as Figure 11 As shown, the guide surface 1901 can be an arc with a predetermined radius (R). Here, for example, the predetermined radius (R) of the guide surface 1901 can be set to 1.8 mm.

[0307] According to this structure, when winding the stator coil 170, the conductor 1702 of the stator coil 170 is guided by the guide surface 1901 to the guide of the tooth insulation portion 1812, the guide of the yoke insulation portion 1811, and the space formed inside the creepage distance extension portion 190, thereby enabling winding along the circumferential surface of the tooth insulation portion 1812 to the guide of the tooth insulation portion 1812, the guide of the yoke insulation portion 1811, and the inner side of the creepage distance extension portion 190. This suppresses the occurrence of wire breakage of the conductor 1702 of the stator coil 170.

[0308] The guide surface 1901 is formed to have an axial length that is smaller than the axial length of the outer guide 18111 and the inner guide 18131.

[0309] Figure 12 It is used for explanation Figure 4 A diagram showing the winding process of the stator coils in the stator. Figure 13 yes Figure 12 A plan view of the stator. Figure 14 It is used to explain in Figure 4The diagram shows the connection method of the wires after the stator core is wound with the stator coil. As previously mentioned, the insulator 180 can be integrally formed by inserting the stator core 160.

[0310] The stator coil 170 can be wound on the stator core 160, which is integrally formed with the insulator 180. Connecting pins 2502 are respectively attached to the connecting pin joints 18113 of the stator 150.

[0311] like Figure 12 As shown, the stator coil 170 can be wound around the outer periphery of the tooth 1604 using a nozzle 172 configured with an opening corresponding to the slot 1605.

[0312] For example, the nozzle 172 can be connected to a wire 1702 to be wound around the outer periphery of the teeth 1604 of the stator core 160. The wire 1702 connected to the nozzle 172 is wound around the outer periphery of a spool 175, which is configured to rotate such that when tension is applied to the wire 1702, the wire 1702 is unwound and pulled out. The nozzle 172 is configured to move up and down along the vertical direction of the stator core 160.

[0313] More specifically, the nozzle 172 is positioned above the opening of the first slot 1605a on one side of the first tooth 1604a of the stator core 160 to which the conductor 1702 is to be wound. When the winding of the stator coil 170 begins, it descends via the first slot 1605a. As the nozzle 172 descends, as... Figure 13 As shown, the stator core 160 rotates circumferentially, causing the second groove 1605b on the other side of the first tooth 1604a to be positioned above the nozzle 172. When the rotation of the stator core 160 is complete, the nozzle 172 moves upward toward the stator core 160 via the second groove 1605b. Then, the stator core 160 rotates in the opposite direction so that the first groove 1605a corresponds to the nozzle 172. Through this process, the wire 1702 via the nozzle 172 can be wound around the outer periphery of the first tooth 1604a. At this time, when the wire 1702 via the nozzle 172 contacts the end of the creepage distance extension 190, guide surfaces 1901 formed at the upper and lower ends of the creepage distance extension 190 guide the wire 1702 to the inside of the creepage distance extension 190.

[0314] When the winding of the first tooth 1604a is completed with a predetermined number of turns (e.g., 200 to 232 turns) around its outer periphery, as Figure 14 As shown, the wire 1702 can be connected to the connecting pin 2502.

[0315] The wire 1702, which is wound around the outer periphery of the tooth 1604, can be supported by the guide protrusion 18115 via one side of the guide protrusion 18115. Thus, when an external force is applied to the motor assembly, the vibration of the wire 1702 is suppressed, thereby preventing the wire 1702 from breaking due to vibration.

[0316] The wire 1702, via the guide protrusion 18115, can be wound a predetermined number of turns around the outer periphery of the connecting pin 2502. The wire 1702 wound a predetermined number of turns (e.g., 4 turns) around the outer periphery of the connecting pin 2502 can be electrically connected to the connecting pin 2502. More specifically, the wire 1702 wound around the outer periphery of the connecting pin 2502 can be fixedly bonded to the connecting pin 2502, for example, by brazing. Here, before winding the wire 1702 around the outer periphery of the tooth 1604, as previously described, the wire 1702 can be wound a predetermined number of turns around the outer periphery of other connecting pins 2502, and then wound around the outer periphery of the tooth 1604 in the aforementioned manner.

[0317] On the other hand, after the wire 1702 and the connecting pin 2502 are connected, the wire 1702 can be fixed to the guide protrusion 18115. More specifically, the wire 1702 can be bonded (adheded) to the guide protrusion 18115 with an adhesive.

[0318] Therefore, it is possible to further suppress the damage (breakage) of the wire 1702 caused by vibration generated during the operation of the motor assembly.

[0319] Figure 15 This is a diagram illustrating a portion of the stator of a motor assembly according to another embodiment of the present invention. Figure 16 yes Figure 15 A partial sectional view, Figure 17 yes Figure 15 A modified example of the stator. As previously described, the motor assembly of an embodiment of the present invention is provided with a stator 150 and a rotor 210. The stator 150 is provided with: a stator core 160; a stator coil 170 wound around the stator core 160; and an insulator 180a that insulates the stator core 160 and the stator coil 170. The stator core 160 is provided with: a yoke 1602; a plurality of teeth 1604 protruding inside the yoke 1602; and pole shoes 1606 extending from the ends of the teeth 1604.

[0320] As previously described, the insulator 180a is injection molded by inserting it into the stator core 160.

[0321] In this embodiment, the insulator 180a is provided with: a yoke insulating portion 1811, which insulates the yoke 1602; a tooth insulating portion 1812, which insulates the tooth 1604; and a pole shoe insulating portion 1813, which insulates the pole shoe 1606.

[0322] like Figure 15 As shown, the yoke insulation portion 1811 is provided with an external guide 18111 that protrudes axially from the yoke (tooth 1604). For example, the external guide 18111 is cylindrical in shape.

[0323] The pole shoe insulation portion 1813 is provided with an internal guide 18131a that protrudes axially from the pole shoe 1606. In this embodiment, the internal guide 18131a is configured to have the same axial length.

[0324] The pole shoe insulation portion 1813 is formed to have the same length along the axial direction.

[0325] On the other hand, the pole shoe insulation portion 1813 is provided with a creepage distance extension portion 190 protruding from the outer surface of the pole shoe insulation portion 1813.

[0326] The creepage distance extension 190 is provided with an inner extension section 191 extending circumferentially from the pole shoe 1606 and an outer extension section 192 extending outward from the outer surface of the inner extension section 191.

[0327] On the other hand, the creepage distance extension 190 is provided with guide surfaces 1901a at both ends along the axial direction, such that the axial length gradually decreases radially outward.

[0328] For example, the guide surface 1901a is formed such that its axial length gradually decreases from both ends of the inner guide 18131a of the pole shoe insulation portion 1813.

[0329] For example, such as Figure 16 As shown, the guide surface 1901a can be presented as an arc shape with a predetermined radius (R).

[0330] For example, such as Figure 17 As shown, the guide surface 1901b can be formed from the upper end of the inner guide 18131a of the pole shoe insulation portion 1813, inclined outward and downward. Although the case where the guide surface 1901b is formed on the inner guide 18131a of the pole shoe insulation portion 1813 disposed on the lower side of the stator core 160 is not specifically illustrated in the figures, the guide surface 1901b can be formed from the lower end of the inner guide 18131a of the pole shoe insulation portion 1813, inclined outward and upward.

[0331] Figure 18 It is Figure 6 The enlarged diagram shows the extended creepage distance. (See figure.) Figure 18 As shown, although the stator coil 170 is actually wound inside the creepage distance extension 190, in this embodiment, the extreme case in which the wire 1702 of the stator coil 170 may be wound around the end of the creepage distance extension 190, making the creepage distance extremely small, is considered to illustrate the creepage distance between the stator coil 170 and the stator core 160.

[0332] In this embodiment, the inner end portion 16061 of the pole shoe 1606 protrudes radially from the insulator 180 (pole shoe insulation portion 1813).

[0333] The creepage distance extension 190 is provided with an inner extension section 191 extending circumferentially from the end of the pole shoe 1606 and an outer extension section 192 extending outward from the inner extension section 191.

[0334] As previously described, the inner extension section 191 is provided with: a first section 1911, extending circumferentially from the end of the pole shoe 1606; a second section 1912, extending radially from the first section 1911 by bending; and a third section 1913, extending circumferentially from the second section 1912.

[0335] The outer extension section 192 is provided with a radial extension section 193 extending radially from the inner extension section 191 and a circumferential extension section 194 extending circumferentially from the radial extension section 193.

[0336] The radial extension section 193 can be bent and extended from the third section 1913 of the inner extension section 191.

[0337] The circumferential extension section 194 can be configured to have: a first section 1941, which bends from the radial extension section 193 and extends circumferentially; a second section 1942, which bends from the first section 1941 and extends radially; and a third section 1943, which bends from the second section 1942 and extends circumferentially.

[0338] In this embodiment, since it is assumed that the conductor 1702 of the stator coil 170 is wound around the outer surface of the third interval 1943 of the circumferential extension interval 194, the third interval 1943 is excluded from the total creepage distance.

[0339] In this embodiment, although for the sake of illustration, the example shows that the third interval 1913 of the inner extended interval 191 and the first interval 1941 of the circumferential extended interval 194 of the outer extended interval 192 are parallel to each other and configured to have the same length, they can also be configured to have different lengths and not be parallel.

[0340] Based on this structure, in this embodiment, the creepage distance between the stator coil 170 and the stator core 160 can be formed as follows: for example, the first interval 1911 of the inner extension interval 191 is 0.4 mm, the second interval is 0.75 mm, and the third interval is 0.6 mm.

[0341] This can be achieved by having the radial extension 193 of the outer extension 192 be 1.1 mm, and the first interval 1941 of the circumferential extension 194 of the outer extension 192 be 0.6 mm, and the second interval 1942 be 0.6 mm. Here, the third interval 1943 of the circumferential extension 194 can be between 1.0 and 1.1 mm.

[0342] According to this structure, it can be ensured that the minimum creepage distance between the stator coil 170 and the stator core 160, extended by the creepage distance extension 190, is 0.4+0.75+0.6+1.1+0.6+0.6=4.05mm.

[0343] This significantly reduces the likelihood of adverse effects caused by leakage current resulting from foreign matter flowing between the stator coil 170 and the stator core 160.

[0344] Furthermore, when the stator coil 170 is wound inside the creepage distance extension 190, the third section 1943 of the outer extension section 192 is additionally included in the total creepage distance, thus ensuring that the total creepage distance is 4.05 + 1.0 (1.1) = 5.05 (5.15) mm.

[0345] Figure 19 yes Figure 18 A variation of the creepage distance extension. For example... Figure 19 As shown, the creepage distance extension 190a of this embodiment is configured to have an inner extension section 191a extending circumferentially from the end of the pole shoe 1606 and an outer extension section 192a extending outward from the inner extension section 191a.

[0346] In this embodiment, the inner extension interval 191a or the outer extension interval 192a may include curve intervals 1913a and 1941a that can further extend the creepage distance.

[0347] For example, the inner extension section 191a can be configured to have: a first section 1911a extending circumferentially from the pole shoe 1606; a second section 1912a extending radially from the first section 1911a in a curved shape; and a third section 1913a extending from the second section 1912a in a curved shape.

[0348] For example, the third interval 1913a can be presented as an arc (semicircle) with a radius of a predetermined size.

[0349] Here, the third interval 1913a can be formed to be circumferentially separated from the second interval 1912a by a predetermined length. Here, the predetermined length by which the third interval 1913a is circumferentially separated from the second interval 1912a can be, for example, about 1.0 mm.

[0350] Therefore, it is possible to suppress the formation of sharp points in the boundary region between the second interval 1912a and the third interval 1913a.

[0351] The outer extension section 192a is provided with a radial extension section 193a extending radially from the inner extension section 191a and a circumferential extension section 194a extending circumferentially from the radial extension section 193a.

[0352] For example, the circumferential extension section 194a is configured to have: a first section 1941a extending circumferentially in a curved shape from the end of the radial extension section 193a; a second section 1942a extending radially from the first section 1941a; and a third section 1943a extending circumferentially from the second section 1942a in a curved manner.

[0353] Here, the third interval 1913a of the inner extended interval 191a formed as a curved interval can be referred to as the first curved interval, and the first interval 1941a of the circumferential extended interval 194a can be referred to as the second curved interval.

[0354] In this embodiment, the first curved interval (the third interval 1913a of the inner extended interval 191a) and the second curved interval (the first interval 1941a of the circumferential extended interval 194a) each have a first radius. Therefore, compared with the case where the second interval 1912a and the radial extended interval 193a of the inner extended interval 191a, as well as the radial extended interval 193a and the first interval 1941a are connected by a straight line (twice the first radius), the creepage distance can be further increased.

[0355] Figure 20 yes Figure 18 A variation of the creepage distance extension. For example... Figure 20As shown, in this embodiment, the creepage distance extension 190b is provided with an inner extension section 191b extending circumferentially from the end of the pole shoe 1606 and an outer extension section 192b extending outward from the inner extension section 191b.

[0356] The outer extension section 192b is configured to have a radial extension section 193b extending radially from the inner extension section 191b and a circumferential extension section 194b extending circumferentially from the radial extension section 193b.

[0357] In this embodiment, the outer extension interval 192b is configured to have a curved interval 193b that can extend the creepage distance.

[0358] For example, the curved interval 193b can be configured to extend radially in a curved shape from the third interval 1913b of the inner extension interval 191b.

[0359] This allows for a further increase in the creepage distance between the stator coil 170 and the stator core 160.

[0360] Figure 21 yes Figure 18 A variation of the creepage distance extension. For example... Figure 21 As shown, in this embodiment, the creepage distance extension 190c is provided with an inner extension section 191c extending circumferentially from the end of the pole shoe 1606 and an outer extension section 192c extending outward from the inner extension section 191c.

[0361] The outer extension section 192c is configured to have a radial extension section 193c extending radially from the inner extension section 191c and a circumferential extension section 194c extending circumferentially from the radial extension section 193c.

[0362] In this embodiment, the inner extension interval 191c and the outer extension interval 192c can be respectively provided with curved intervals 1913c, 193c, and 1941c with curved shapes.

[0363] The inner extension section 191c is provided with: a first section 1911c, which extends circumferentially from the pole shoe 1606; a second section 1912c, which extends radially from the first section 1911c in a curved manner; and a third section 1913c, which extends circumferentially in a curved shape from the second section 1912c.

[0364] Here, the third interval 1913c can be presented as an arc (semicircle) shape with a radius of a predetermined size.

[0365] The outer extension section 192c is provided with a radial extension section 193c extending radially from the inner extension section 191c and a circumferential extension section 194c extending circumferentially from the radial extension section 193c.

[0366] For example, the radial extension interval 193c can extend from the third interval 1913c of the inner extension interval 191c in a curved shape. The radial extension interval 193c can be an arc shape with a predetermined radius.

[0367] The circumferential extension interval 194c is provided with: a first interval 1941c, which extends in a curved shape from the radial extension interval 193c; a second interval 1942c, which extends radially from the first interval 1941c; and a third interval 1943c, which extends circumferentially from the second interval 1942c by curving.

[0368] For example, the first interval 1941c can be presented as an arc (semicircle) shape with a radius of a predetermined size.

[0369] According to this structure, the creepage distance can be further extended by the third interval 1913c of the inner extension interval 191c, the radial extension interval 193c, and the first interval 1941c of the outer extension interval 192c, which have a longer length than a straight line.

[0370] Figure 22 yes Figure 18 A variation of the creepage distance extension. For example... Figure 22 As shown, in this embodiment, the creepage distance extension 190d is provided with an inner extension section 191d extending circumferentially from the end of the pole shoe 1606 and an outer extension section 192d extending outward from the inner extension section 191d.

[0371] The outer extension 192d is configured to have a radial extension 193d extending radially from the inner extension 191d and a circumferential extension 194d extending circumferentially from the radial extension 193d.

[0372] In this embodiment, the inner extension interval 191d and the outer extension interval 192d can be respectively provided with curved intervals 1914d and 1931d with curved shapes.

[0373] The inner extension interval 191d is provided with: a first interval 1911d, which extends circumferentially from the pole shoe 1606; a second interval 1912d, which extends radially by curving from the first interval 1911d; and a third interval 1913d, which extends circumferentially from the second interval 1912d.

[0374] The outer extension interval 192d is provided with a radial extension interval 193d extending radially from the inner extension interval 191d and a circumferential extension interval 194d extending circumferentially from the radial extension interval 193d.

[0375] In this embodiment, the curve intervals 1914d and 1931d are configured to have a first curve interval 1914d forming the boundary between the inner extended interval 191d and the outer extended interval 192d.

[0376] For example, the first curve interval 1914d can be presented as an arc shape with a radius of a predetermined size.

[0377] For example, the first curve interval 1914d can be presented as an arc shape corresponding to 3 / 4 of a circle having a radius that is the same length as the third interval 1913d of the inner extended interval 191d.

[0378] The radius extension interval 193d can be formed to extend radially from the first curve interval 1914d.

[0379] The curve intervals 1914d and 1931d are configured to have a second curve interval 1931d that extends in a curved shape from the radially extended interval 193d.

[0380] For example, the second curve interval 1931d can be presented as an arc shape with a radius of a predetermined size.

[0381] For example, the second curve interval 1931d can be presented as having the same radius as the first curve interval 1914d. The second curve interval 1931d can be presented as an arc shape corresponding to 3 / 4 the size of a circle having a radius of the same size as the first curve interval 1914d.

[0382] The circumferential extension interval 194d is configured to have: a first interval 1941d, extending circumferentially from the second curved interval 1931d; a second interval 1942d, extending radially by curving from the first interval 1941d; and a third interval 1943d, extending circumferentially by curving from the second interval 1942d.

[0383] According to this structure, the creepage distance extension 190d of this embodiment is configured to have a first curve interval 1914d and a second curve interval 1931d with a longer length than a straight line, so that the creepage distance between the stator coil 170 and the stator core 160 can be further extended.

[0384] Figure 23This is a plan view of the stator core of a motor assembly before the stator coil is wound, according to another embodiment of the present invention. Figure 24 yes Figure 23 An enlarged view of the creepage distance extension section. As previously described, the motor assembly of this embodiment includes a stator 150 and a rotor 210.

[0385] The stator 150 is provided with: a stator core 160; a stator coil 170 wound around the stator core 160; and an insulator 180b that insulates the stator core 160 and the stator coil 170.

[0386] The stator core 160 is configured to have: a yoke 1602; a plurality of teeth 1604 protruding from the yoke 1602; and pole shoes 1606 extending circumferentially to both sides from the ends of the plurality of teeth 1604.

[0387] like Figure 23 As shown, the insulator 180b can be manufactured by injection molding by inserting it into the stator core 160.

[0388] The insulator 180b is configured to have an insulator body 181 and a creepage distance extension 190e. The insulator body 181 surrounds the inner surface of the yoke 1602 and the peripheral surface of the tooth 1604 to insulate them, and surrounds the outer surface of the pole shoe 1606 with the inner end 16061 of the pole shoe 1606 exposed to the outside to insulate it. The creepage distance extension 190e extends the creepage distance between the stator coil 170 and the inner end 16061 of the pole shoe 1606.

[0389] For example, the insulator body 181 is configured to have: a yoke insulating portion 1811 that insulates the inner surface of the yoke 1602; a tooth insulating portion 1812 that insulates the circumferential surfaces (upper surface, bottom surface, and both sides) of the tooth 1604; and a pole shoe insulating portion 1813 that insulates the pole shoe 1606 such that the inner end 16061 of the pole shoe 1606 is exposed to the outside.

[0390] In this embodiment, the pole shoe insulation portion 1813 of the insulator 180b can be configured to have the same inner diameter as the inner diameter of the pole shoe 1606.

[0391] The yoke insulation portion 1811 is disposed on the inner surface of the yoke portion 1602 and is configured to protrude axially from both sides (upper and lower sides) of the stator core 160.

[0392] In the yoke insulation portion 1811, a protrusion 18112 may be formed in the region disposed on the lower side of the stator core 160. In order to form the aforementioned connecting pin engagement portion 18113, the protrusion 18112 has an outer diameter in the radial direction that is larger than the outer diameter of the stator core 160.

[0393] In this embodiment, the aforementioned cut-off portion 18114 may not be formed in the protrusion 18112.

[0394] On the other hand, in this embodiment, the creepage distance extension 190e is configured to have an inner extension section 191e extending circumferentially from the end of the pole shoe 1606 and an outer extension section 192e extending outward from the inner extension section 191e.

[0395] like Figure 24 As shown, the inner extension section 191e is configured to have: a first section 1911e extending circumferentially from the pole shoe 1606; a second section 1912e extending radially from the first section 1911e by bending; and a third section 1913e extending circumferentially from the second section 1912e by bending.

[0396] The outer extension section 192e can be configured to extend obliquely outward from the inner extension section 191e.

[0397] The outer extension section 192e is configured to have: a first section 1921e that extends obliquely outward from the third section 1913e of the inner extension section 191e; and a second section 1922e that extends radially and curves from the first section 1921e.

[0398] In this embodiment, an arc portion is formed at the boundary region of the third interval 1913e of the inner extended interval 191e and the first interval 1921e of the outer extended interval 192e.

[0399] Figure 25 yes Figure 24 A variation of the creepage distance extension section. For example... Figure 25 As shown, in this embodiment, the creepage distance extension 190f is provided with: an inner extension section 191f, which extends circumferentially from the pole shoe 1606; and an outer extension section 192f, which extends outward from the inner extension section 191f.

[0400] In this embodiment, for example, the outer extension section 192f is configured to have an outer surface 193b that extends in a vertical direction relative to the connecting line between the center of the tooth 1604 and the center of the stator core 160.

[0401] In this embodiment, the creepage distance extension portion 190f is configured to have curved intervals 1913f and 1921f that extend in a curved shape in a manner that enables the creepage distance to be extended.

[0402] The inner extension section 191f is configured to have: a first section 1911f extending circumferentially from the pole shoe 1606; a second section 1912f extending radially from the first section 1911f in a curved manner; and a third section 1913f extending circumferentially in a curved shape from the second section 1912f.

[0403] In this embodiment, for example, the third interval 1913f of the inner extended interval 191f can be presented as an arc shape with a radius of a predetermined size.

[0404] The outer extension interval 192f can be configured to have: a first interval 1921f, which extends in a curved shape from the inner extension interval 191f (the third interval 1913f); and a second interval 1922f, which extends radially from the first interval 1921f by curving.

[0405] For example, the first interval 1921f can be presented as an arc shape with a radius of a predetermined size.

[0406] According to this structure, the creepage distance between the stator coil 170 and the stator core 160 wound around the outer periphery of the tooth 1604 can be further extended by the third interval 1913f of the inner extension interval 191f formed in a curved shape and the first interval 1921f of the outer extension interval 192f.

[0407] The above description illustrates and describes specific embodiments of the present invention. However, the present invention can be implemented in various forms without departing from its spirit or essential characteristics, and therefore the embodiments described above should not be limited to the specific content used to implement the invention.

[0408] Furthermore, even the embodiments not listed individually in the detailed description above should be broadly interpreted within the scope of the technical concept defined in the appended claims. Moreover, all modifications and variations included within the scope of the above claims and their equivalents should be included in the appended claims.

Claims

1. A motor assembly, in, include: A stator comprising a stator core, a stator coil wound around the stator core, and an insulator insulating the stator core and the stator coil; and The rotor is configured to rotate relative to the stator; The stator core is provided with: yoke; A plurality of teeth protrude radially from the yoke; and The pole shoe extends circumferentially to both sides from each end of the plurality of teeth; The insulator is provided with: An insulator body insulates the inner surface of the yoke and the circumferential surface of the teeth, and insulates the outer surface of the pole shoe by exposing the inner end of the pole shoe to the outside; and Creepage distance extension section, which extends the creepage distance between the stator coil and the inner end of the pole shoe; The creepage distance extension section is provided with: The inner extension section extends circumferentially from the end of the pole shoe; and The outer extension interval extends outward from the inner extension interval respectively; The inner extended interval includes: The first section extends circumferentially from the inner end of the pole shoe; The second section extends radially, curving from the first section; and The third section curves from the second section and extends circumferentially; The outer extended interval includes: A radially extended section, curving from the third section of the inner extended section and extending radially; and The circumferential extension interval extends circumferentially from the radial extension interval.

2. The motor assembly according to claim 1, wherein, The insulator body includes: An insulating portion for insulating the inner surface of the yoke; Tooth insulation portion, which insulates the circumferential surface of the tooth; and The pole shoe insulation portion insulates the outer surface of the pole shoe. The yoke insulation portion and the pole shoe insulation portion are respectively provided with guides that extend further to both sides along the axial direction than the tooth insulation portion; The insulator is injection molded by inserting it into the stator core.

3. The motor assembly according to claim 2, wherein, The end of the creepage distance extension and the yoke insulation portion are formed at a predetermined distance; The preset distance between the end of the creepage distance extension and the yoke insulation is set to 5.6 to 8.3 times the wire diameter of the stator coil conductor.

4. The motor assembly according to claim 2, wherein, The inner extension section is formed to have an inner diameter that is larger than the inner diameter of the pole shoe in such a way that the end of the pole shoe protrudes by a predetermined length.

5. The motor assembly according to claim 2, wherein, The insulating portion of the yoke is provided with a protrusion, the protrusion having an outer diameter that is larger than the outer diameter of the yoke; The protrusion is provided with a plurality of cut-off portions, each cut-off portion being cut to have a minimum outer diameter smaller than the outer diameter of the yoke portion; Any one of the plurality of cut-out portions has a shape that is different from the shape of the other cut-out portions of the plurality of cut-out portions.

6. The motor assembly according to claim 2, wherein, The end of the creepage distance extension and the yoke insulation portion are formed at a predetermined distance; The conductor diameter of the stator coil is 0.12 mm to 0.18 mm. The preset distance between the end of the creepage distance extension and the yoke insulation is set to 1.0 mm.

7. The motor assembly according to claim 1, wherein, Guide surfaces are provided at both ends of the creepage distance extension along the axial direction, and the guide surfaces are formed such that their axial length gradually decreases radially outward.

8. The motor assembly according to claim 7, wherein, The guiding surface has an outwardly convex arc cross section.

9. The motor assembly according to claim 7, wherein, The guiding surface has a linear cross-section that slopes outwards.

10. The motor assembly according to claim 1, wherein, The insulator is provided with a connecting pin engagement portion, and one end of the connecting pin connected to the printed circuit board is engaged with the connecting pin engagement portion.

11. The motor assembly according to claim 10, wherein, The ends of the conductors of the stator coil are electrically connected to the connecting pins. The insulator is provided with guide protrusions to guide the wire.

12. The motor assembly according to claim 10, wherein, The plurality of teeth are set to three; The stator coil has three phase coils wound on a plurality of teeth, and the three phase coils are respectively connected to the three-phase power supply section of the printed circuit board.

13. The motor assembly according to claim 1, wherein, The insulator body includes: An insulating portion for insulating the inner surface of the yoke; Tooth insulation portion, which insulates the circumferential surface of the tooth; and The pole shoe insulation portion insulates the outer surface of the pole shoe. The outer extended section has an outer surface that extends from the pole shoe insulation portion in a direction perpendicular to the radial direction.

14. The motor assembly according to claim 13, wherein, The ends of the inner extended section and the ends of the outer extended section are arranged on the same line.

15. The motor assembly according to claim 1, wherein, The inner extended interval or the outer extended interval is a curved interval with a curved cross-sectional shape.

16. The motor assembly according to claim 1, wherein, The boundary region between the inner extended interval and the outer extended interval has a curved section with a curved cross-sectional shape.

17. The motor assembly according to any one of claims 1 to 16, wherein, The rotor is equipped with a rotating shaft and a permanent magnet coupled to the rotating shaft. An impeller is attached to the rotating shaft. An outer casing is provided on the outside of the impeller. An inner shell is concentrically disposed on the inner side of the outer shell. The stator is inserted axially into one end of the inner housing to a predetermined depth.

18. The motor assembly according to claim 17, wherein, A bearing assembly that provides rotatable support for the rotating shaft is disposed inside the inner housing.

Images