JP2020010482A - Electric blower and vacuum cleaner mounted with the same - Google Patents

Abstract

To provide an electric blower and a vacuum cleaner in which noise caused by the vibration of a stator is reduced.SOLUTION: An electric blower is provided with: a motor provided with a rotor core and a stator core; a rotatably arranged rotary shaft; the rotor core integrally molded near one end portion of the rotary shaft; a rotary vane installed near the other end portion of the rotary shaft; a pair of bearings installed on the rotary shaft between the rotor core and the rotary vane; a housing for holding the pair of bearings; and a fan casing covering the rotary vane. The stator core connects a plurality of partitioned cores with identical shapes. Each of the partitioned cores is arranged with a winding frame of an insulation member covering each of the partitioned cores, and has a joint part for connecting gaps of adjacent winding frames to each other.SELECTED DRAWING: Figure 6(a)

Description

  The present invention relates to an electric blower and a vacuum cleaner equipped with the same.

  In recent years, demand for cordless vacuum cleaners and self-propelled vacuum cleaners has been increasing rapidly, and electric blowers that use DC brushless motors to obtain sufficient output even with low-voltage battery operation and reduce vibration and noise Is used.

  In addition, in order to achieve downsizing of the vacuum cleaner, downsizing of the electric blower is also required. Regarding miniaturization of the electric blower, the outer diameter of the fan can be reduced by increasing the speed of the electric blower. Therefore, there is an example in which the number of rotations of the brushless motor is about 80,000 or more per minute.

  2. Description of the Related Art As a conventional electric blower for a vacuum cleaner, for example, there is one disclosed in JP-A-2006-153636 (Patent Document 1).

  The electric blower disclosed in Patent Literature 1 includes a rotary shaft provided rotatably, a bearing provided substantially at the center of the rotary shaft in the axial direction, and a centrifugal shaft provided at one end of the rotary shaft. An impeller, a rotor core provided on the opposite side to the centrifugal impeller with the bearing portion of the rotating shaft interposed therebetween, a stator core disposed to face around the rotor core, and provided at the other end of the rotating shaft. A ring member that is larger than the specific gravity of the rotor core, and is made of a non-magnetic material. "

JP-A-2006-153636

  In the electric blower of Patent Document 1, the balance is adjusted by the ring member provided at the shaft end and the centrifugal impeller, so that the unbalance amount of the rotating body (rotor assembly) can be reduced, and the vibration of the rotating body is reduced. A high-speed rotation of 80,000 revolutions per minute or more is enabled, and the size of the electric blower is reduced. In addition, the operating noise of the electric vacuum cleaner is reduced by reducing the rotational vibration.

  Here, when the electric blower is operated, the electromagnetic force generated between the rotor core and the stator core changes periodically with the rotation of the rotor core. This periodically changing electromagnetic force may cause the stator core to vibrate, which may generate noise.

  SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and to suppress vibration generated from a stator portion with a simple structure, to reduce noise, and particularly to reduce harmonic noise (an integral multiple of the rotation frequency) of the rotation frequency. It is an object of the present invention to provide an electric blower and a vacuum cleaner which can be achieved.

  In order to solve the above problems, one of typical electric blowers of the present invention is an electric blower having a rotor core and a stator core, a rotating shaft rotatably provided, and integrally formed near one end of the rotating shaft. Rotor core, a rotor blade mounted near the other end of the rotary shaft, a pair of bearings mounted on the rotary shaft between the rotor core and the rotary blade, a housing holding the pair of bearings, and a fan covering the rotor blade. A stator core is formed by connecting a plurality of split cores having the same shape, and the split core has an annular yoke portion, a pole portion projecting from the yoke portion toward the inner diameter side, and a tip portion of the pole portion. This is achieved by forming a tooth portion on each of the divided cores, disposing a winding frame of an insulating member covering each of the divided cores, and having a connecting portion for connecting the tooth portion by adjacent winding frames.

  Advantageous Effects of Invention According to the present invention, it is possible to provide an electric blower that can suppress vibration of a motor stator portion and reduce noise, in particular, harmonic noise of a rotation frequency, and a vacuum cleaner including the same. is there.

  Problems, configurations, and effects other than those described above will be apparent from the following description of the embodiments.

It is an outline view of an electric blower in an example of an embodiment of the present invention. It is a longitudinal section of an electric blower in an example of an embodiment of the present invention. It is a top view of a stator core in an example of an embodiment of the present invention. It is a perspective view of the division core which constitutes a stator core in an example of an embodiment of the present invention. FIG. 3 is an exploded perspective view of a split core and a bobbin forming a stator according to the embodiment of the present invention. It is the perspective view which fitted the split core and the winding frame which comprise the stator in embodiment of this invention. FIG. 2 is an external perspective view in which a winding frame is fitted to a divided core constituting a stator and a field winding is wound in the embodiment of the present invention. It is the appearance perspective view which looked at the stator in the embodiment of the present invention from the fan casing side. It is a sectional view of a stator in an example of an embodiment of the present invention. It is the appearance perspective view which looked at the stator in the embodiment of the present invention from the fan casing side. It is the top view seen from the stator side of the bobbin 10 in the embodiment of the present invention. It is an external view in which two divided cores were fitted. It is sectional drawing to which the teeth part was expanded. FIG. 3 is an external view in which a winding frame is fitted to a split core. 9 is a frequency analysis result illustrating a noise reduction effect due to a stator tooth portion constraint. 1 is a perspective view showing a vacuum cleaner equipped with an electric blower according to an embodiment of the present invention, which is used as a stick type. BRIEF DESCRIPTION OF THE DRAWINGS It is a side view at the time of using a vacuum cleaner equipped with the electric blower in one Example of this invention, and using a vacuum cleaner as a handy type. It is a longitudinal cross-sectional view of the cleaner main body equipped with the electric blower in a present Example.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the present embodiment, the rotating blades will be described using centrifugal impellers.

  The electric blower 200 will be described with reference to an external view of the electric blower shown in FIG. 1A and a vertical sectional view of the electric blower shown in FIG. The electric blower 200 is roughly divided into a blower unit 201 and an electric motor unit 202. The blower unit 201 includes a centrifugal impeller 1 that is a rotating blade, a fan casing 2 that houses the centrifugal impeller 1, a plurality of diffuser blades 3a, and a plurality of return guide blades 3b on the back surface of the diffuser blade 3a. It is composed of a guide wing 3. The fan casing 2 is provided with an air inlet 2a. An airtight holding member 2b using an elastic body is formed integrally with the fan casing 2 on the inner surface of the fan casing 2. In this embodiment, the airtight holding member 2b and the fan casing 2 are integrally formed by insert molding.

  The centrifugal impeller 1 is made of a thermoplastic resin and is directly connected to the rotating shaft 4. Here, in the present embodiment, the centrifugal impeller 1, which is a rotary blade, is press-fitted and fixed to the rotary shaft 4, but a screw is provided at an end of the rotary shaft 4, and the centrifugal impeller 1 is fixed using a fixing nut. May be.

  The motor unit 202 includes a rotor core 6 fixed to the rotating shaft 4 housed in the housing 5 and a stator 7 fixed to the housing 5.

  The rotor core 6 is formed on the end of the rotating shaft 4 opposite to the end on which the centrifugal impeller 1 is fixed, and is made of a rare-earth bonded magnet. A rare earth-based bonded magnet is made by mixing a rare earth-based magnetic powder and an organic binder. As the rare earth bonded magnet, for example, a samarium iron nitrogen magnet, a neodymium magnet, or the like can be used. The rotor core 6 is formed integrally with the rotating shaft 4. In this embodiment, a permanent magnet is used for the rotor core 6. However, the present invention is not limited to this. For example, a reluctance motor, which is a type of a commutatorless motor capable of rotating at a high speed of 80,000 or more per minute, is used. May be used.

  The stator 7 is arranged on the outer peripheral side of the rotor core 6 and is fixed to the housing 5 with fixing screws 8. The stator 7 includes a stator core 9 (FIG. 2) formed by laminating electromagnetic steel sheets in the rotation axis direction, and two winding frames 10, 11 around the stator core 9, and a field winding via the winding frames 10, 11. 12 are wound. The field winding 12 is electrically connected to a circuit unit (not shown) provided in the electric blower 200.

  Bearings 13 and 14 are provided between the centrifugal impeller 1 and the rotor core 6 to rotatably support the rotating shaft 4. A spring 15 is arranged between the bearings 13 and 14 in a compressed state, and applies a preload to the bearings 13 and 14. The bearings 13 and 14 and the spring 15 are included in a bearing cover 16. A ring 17 for balance adjustment is attached to the end of the rotating shaft 4 closer to the rotor core 6. By rotating the rotating body and shaving the back surface of the centrifugal impeller 1 and the ring 17, the two-plane balance can be corrected. The balance adjusting ring 17 is made of a metal material having a specific gravity greater than that of the rotor core 6, and is manufactured by, for example, a sintered product such as a copper material or by machining.

  A positioning sleeve 18 for the bearing 14 is arranged between the rotor core 6 and the bearing 14. The housing 5 is a synthetic resin material, and has a support portion 19 for fixing a bearing cover 16 including the bearings 13 and 14. The bearing cover 16 is made of a non-magnetic metal material, and is integrated with the resin housing 5 by insert molding. The bearing cover 16 is desirably made of a material having a high thermal conductivity such as an aluminum alloy.

  A screw hole 20 extending in the rotation axis direction is formed at an end of the support portion 19 of the resin housing 5. A fixing screw 21 can be screwed into the screw hole 20, and the guide blade 3 is fixed to the resin housing 5 by screwing the fixing screw 21. The housing 5 is provided with an opening 22 for allowing air to flow into the housing 5 and an exhaust port 23 for discharging air to the outside of the electric blower 200. The stator core 9 and the winding frame 11 of the stator 7 arranged at the end of the housing 5 are fixed to the housing 5 by fixing screws 8.

  Next, the flow of air in the electric blower 200 will be described. When the motor unit 202 is driven to rotate the centrifugal impeller 1, which is a rotating blade, air flows in from the air suction port 2 a of the fan casing 2 and flows into the centrifugal impeller 1. The inflowing air is pressurized and accelerated in the centrifugal impeller 1 and flows out from the outer periphery of the centrifugal impeller 1. The airflow flowing out of the centrifugal impeller 1 is guided to the guide vanes 3.

  The guide vanes 3 are provided with a plurality of diffuser blades 3a, and the air flow is reduced between the blades of the diffuser blades 3a, so that the kinetic energy of the air flow is converted into pressure energy to increase the pressure. The air flow that has flowed out between the diffuser blades 3a flows into the return guide blades 3b from a flow path formed by the inner surface of the fan casing 2 and the guide blades 3.

  The airtightness between the fan casing 2 and the diffuser blade 3a is maintained by the bite of the diffuser blade 3a into the airtight holding member 2b of the fan casing 2. As a result, it is possible to prevent the guide wing 3 from leaking between the deuser blades 3a, and to improve the blower efficiency. In this embodiment, a diffuser with blades is used, but a diffuser without blades may be used.

  The airflow that has passed through the return guide blades 3b flows into the housing 5 through the opening 22 of the housing 5, cools the cooling fins 24 of the bearing cover 16, and thereby cools the bearings 13, 14 via the bearing cover 16. I do. Further, the rotor core 6, the stator core 9, the field winding 12 and the like are cooled and discharged to the outside. Thereby, each part in the housing 5 is cooled. Part of the airflow that has passed through the return guide blades 3b is discharged to the outside from the exhaust port 23 of the housing 5.

  The stator 7 of the motor unit 202 according to one embodiment of the present invention will be described with reference to FIGS. FIG. 2A is a plan view of the stator core 9 according to the embodiment of the present invention, FIG. 2B is a perspective view of a split core 25 forming the stator core 9, and FIG. An exploded perspective view of the winding frame 10 and the winding frame 11, (b) is a perspective view in which the divided core 25 and the winding frame 10 and the winding frame 11 are fitted, and (c) is a diagram in which the winding frame 10 and the winding frame 11 are fitted to the divided core 25. FIG. 4A is an external perspective view of the stator 7 seen from the fan casing 2 side, FIG. 4B is a cross-sectional view of the stator 7, and FIG. 7 is a perspective view of the external appearance when viewed from the fan casing 2 side, FIG. 5 is a plan view of the winding frame 10 as viewed from the stator 7 side, and FIG. 6A is a cross-sectional view in which the stator teeth portion is enlarged. . FIG. 6A is an external view in which two split cores are fitted, and FIG. 6B is an enlarged cross-sectional view of the teeth portion. FIG. 7 is an external view in which the winding frame 10 is provided on the split core 25.

  First, a stator core 9 constituting a stator 7 according to an embodiment of the present invention will be described with reference to FIG. The stator core 9 of one embodiment according to the present invention is configured by connecting split cores 25 having the same shape. The divided cores 25 are formed by laminating electromagnetic steel sheets in the rotation axis direction, and fix the electromagnetic steel sheets to each other by caulking portions 26. The split core 25 includes a yoke portion 27, a pole portion 28, and a teeth portion 29. A slot portion 30 into which the field winding 12 is inserted is formed by a space surrounded by the yoke portion 27, the pole portion 28, and the teeth portion 29 of each split core 25.

  At the circumferential end of the yoke 27, a substantially rectangular groove 31 for connecting the divided cores 25 is provided, and at the other end, a substantially rectangular protrusion 32 is provided. The stator core 9 is integrally formed by fitting the divided cores 25. In the stator 7, the winding frames 10 and 11 are arranged on each of the divided cores 25 (see FIG. 3B), and the field winding 12 is attached to the pole 28 of each of the divided cores 25 via the winding frames 10 and 11. Is wound (see FIG. 3C), the divided cores 25 are connected and integrally formed. A through hole 33 for fixing the split core 25 to the housing 5 is provided on the yoke portion 27 at the center in the circumferential direction, and is fixed to the housing 5 by the fixing screw 8 together with the winding frame 11.

  By using the split core 25 as the stator core 9, the material utilization rate of the electromagnetic steel sheet is improved as compared with the case where the stator core is formed as an integral core, and the material cost can be reduced. Further, since the area around the pole portion 28 around which the field winding 12 is wound is open, the winding process is easy to perform, and the productivity can be increased. Furthermore, since it becomes easy to wind the field winding 12 orderly, the length of the field winding 12 can be shortened, and the efficiency of the electric blower 200 can be improved.

  Further, by providing the caulked portions 26 of each of the split cores 25 at both ends of the yoke portion 27 and the pole portion 28, the rigidity of the split core 25 alone is improved. The divided cores 25 can be firmly connected to each other by the substantially rectangular groove portions 31 at the circumferential ends of the divided cores 25 and the substantially rectangular projections 32, and can be integrally formed without requiring welding or the like. The rigidity of the stator core 9 can be increased. Here, in the present embodiment, the circumferential ends of the split cores 25 are connected by the substantially square groove 31 and the substantially square protrusion 32, but may be substantially trapezoidal, substantially triangular, substantially elliptical, etc. Alternatively, it is only necessary that the divided cores 25 can be firmly connected to each other.

  Next, a stator 7 according to an embodiment of the present invention will be described with reference to FIGS. Two winding frames 10 and 11 are arranged around the split core 25 according to one embodiment of the present invention. The winding frame 10 and the winding frame 11 are made of an insulating synthetic resin material, and are fitted so as to prevent the field winding 12 from directly contacting the split core 25. Note that the split core 25 shown in FIG. 3A integrally displays laminated electromagnetic steel sheets.

  The winding frame 10 and the winding frame 11 may be any as long as they can be easily formed, and have both electric insulation and some heat resistance and rigidity. For example, polybutylene terephthalator resin (PBT), polyethylene terephthalate resin (PET) or those containing glass fibers are desirable.

  The winding frame 10 includes a part of the inner peripheral surface 27a on the inner diameter side of the yoke portion 27 of the split core 25 and a part of the inner diameter side of the upper surface 27b in the direction indicated by the arrow A shown in FIG. And the upper surface 28b and the side surface 29a and the upper surface 29b of the teeth portion 29 are integrally formed. A winding guide 34 for winding the field winding 12 is formed on the winding frame 10. As shown in FIG. 5, fitting portions 35 and 36 are provided at ends of the winding frame 10 in the circumferential direction covering the teeth portions 29 so as to connect the winding frames 10 to each other. When the split cores 25 are connected, the fitting portions 35 and 36 are connected, and are restricted in the circumferential direction and the radial direction. Thereby, the rigidity of the integrated stator 7 can be increased.

  The winding frame 11 includes a part and a lower surface 27d of the outer peripheral surface 27c on the outer diameter side of the yoke portion 27 of the split core 25 and a lower surface (not shown) of the pole portion 28 in the direction indicated by the arrow B shown in FIG. ) And the lower surface 29c of the teeth portion 29 are integrally formed. The winding frame 11 is provided with a winding guide 37 for winding the field winding 12 and a mounting hole 38 (see FIG. 4C) for fixing the stator 7 to the housing 5.

  As shown in FIGS. 3B and 3C, by fitting the bobbin 10 and the bobbin 11 into the split core 25, the slot portion 30 is covered with the bobbin 10 and the bobbin 11 having insulating properties. Therefore, since the field winding 12 and the split core 25 do not directly contact each other, it is possible to electrically insulate. As a result, the field winding 12 can be wound around the split core 25 with a strong tension, so that the split core 25 and the winding frame 10 and the winding frame 11 can be strongly adhered and integrated.

  Winding guides 34 and 37 are formed on the winding frames 10 and 11, respectively. The winding guides 34 and 37 serve as guides for winding the field winding 12 around the pole 28, and the field winding 12 protrudes toward the teeth 29. , And the field winding 12 can be wound with a strong tension.

  The winding frame 10 and the winding frame 11 are fitted to the split core 25, the field winding 12 is wound thereon, and then the split cores 25 (FIG. 3C) are inserted and fitted in the rotation axis direction to fit the stator 7 together. (FIG. 5) is formed. At this time, the fitting portions 35 and 36 of the winding frame 10 are also connected together, so that the rigidity of the integrated stator 7 (FIG. 4C) can be increased.

  As shown in FIG. 5, the fitting portions 35 and 36 of the winding frame 10 are formed with fitting portions 35a and 35b on the fitting portion 35 side and fitting portions 36a and 36b on the fitting portion 36 side. I have. As shown in FIG. 6, the circumferential direction is connected by connecting the fitting portions 35a and 36a, and the radial direction is connected by connecting the fitting portions 35b and 36b. Accordingly, the teeth 29 are integrated, and the rigidity of the teeth 29 can be increased.

  The fitting portions 35 and 36 of the winding frame 10 are not limited to the shape shown in FIG. 5, and the split core 25 can be inserted from the rotation axis direction, and the circumferential direction and the radial direction are firmly connected by the fitting portions 35 and 36. I hope I can do it. For example, a substantially square groove shape and a substantially square protrusion shape, a substantially trapezoidal shape, a substantially triangular shape, a substantially elliptical shape, or the like may be used.

  As shown in FIG. 7, one end of the fitting portions 35 and 36 of the winding frame 10 in the rotation axis direction is chamfered 39. When the intersection between the fitting portions 35 and 36 and the chamfer 39 is D, when the length from the chamfer 39 and the other end to the intersection D is L1, and when the thickness of the stator core 9 is L2, L1 <L2. Like that. That is, the length (L1) in the rotation axis direction of the portion where the fitting portions 35 and 36 of the winding frame 10 are connected is shorter than the thickness L2 of the stator core 9.

  As a result, since the stator 7 has the divided cores 25 inserted and connected in the rotation axis direction, the groove 31 and the projection 32 connecting the divided cores 25 before the fitting portions 35 and 36 of the winding frame 10 are connected. Is connected. In addition, since the chamfer 39 is formed on the end surface of the bobbin 10, the fitting portions 35 and 36 of the bobbin 10 can be smoothly connected to connect the bobbin 10 to each other. Therefore, the manufacturing process of the stator 7 can be easily performed, and the productivity can be increased.

  Here, in this embodiment, the chamfer 39 of the winding frame 10 is chamfered by an R shape, but may be chamfered by a straight line or the like, as long as L1 <L2.

  When the electric blower 200 is operated, an attractive force and a repulsive force are generated in the teeth 29 of the stator 7 by the electromagnetic force generated between the rotor core 6 and the teeth 29 of the stator 7, and the teeth are rotated with the rotation of the rotor core 6. A periodically changing force is applied to the portion 29. The stator core 9 vibrates due to the periodically changing force, and harmonics (an integral multiple of the rotation frequency) of the rotation frequency are likely to generate noise.

  In this embodiment, the winding frames 10 and 11 are formed in tight contact with the stator core 9, so that the fitting portions 35 and 36 can restrict the circumferential direction and the radial direction of the teeth portion 29, and Vibration can be suppressed, and harmonic noise of the rotation frequency can be reduced.

  Further, since the length L1 of the winding frame 10 and the thickness L2 of the stator core 9 are L1 <L2, and the chamfer 39 is formed on the end surface of the winding frame 10, the divided core 25 is connected first, and then the winding is performed. Since the frame 10 is connected, the assemblability is good. Therefore, vibration generated from the stator portion 29 can be suppressed with a simple structure, and noise can be reduced.

  FIG. 8 is a diagram illustrating the noise reduction effect of the winding frame 10 of the present invention in which the teeth 29 are constrained in the circumferential direction and the radial direction. The horizontal axis indicates the frequency, and the vertical axis indicates the sound pressure level. The solid line indicates the result of restricting the teeth of the present embodiment, and the broken line indicates the result without the restriction of the teeth. When the teeth 29 are not restrained, the rotational frequency noise and the noise of the harmonics of the rotational frequency are high. By doing so, it can be seen that the harmonic noise is significantly reduced. The lower the harmonic noise, the better the audibility.

  According to the electric blower 200 of the present embodiment described above, since the stator core 9 is the split core 25, the material utilization rate of the electromagnetic steel sheet can be improved, and the material cost can be reduced. Further, the winding step of winding the field winding 12 becomes easier, and the productivity can be increased. Further, since the field winding 12 is easily and neatly wound, the length of the field winding 12 is shortened, and the efficiency of the electric blower 200 can be improved.

  Further, by providing the caulking portion 26 in each of the divided cores 25, the rigidity of the divided core 25 alone is improved. Further, the divided cores 26 can be firmly connected to each other by the groove portions 32 and the protruding portions 33 at the circumferential ends of the divided cores 25, and the rigidity of the integrated stator core 9 is increased without the need for welding or the like. be able to.

  Further, winding guides 34 and 37 are formed on the winding frames 10 and 11, respectively, to prevent the field winding 12 from protruding toward the teeth portion 29, and wind the field winding 12 with strong tension. As a result, the divided core 25 and the bobbin 10 and the bobbin 11 can be tightly adhered and integrated.

  Furthermore, by connecting the fitting portions 35 and 36 of the winding frame 10, the circumferential direction and the radial direction of the tooth portion 29 can be connected, and the tooth portion 29 is integrated. This makes it possible to increase the rigidity of the teeth portion 29, suppress vibrations generated from the stator portion 29 with a simple structure, and reduce noise.

  Further, since the length L1 of the winding frame 10 and the thickness L2 of the stator core 9 are L1 <L2, and the chamfer 39 is formed on the end surface of the winding frame 10, the divided core 25 is connected first, and then the winding is performed. Since the frames 10 are connected, the assemblability is good, and the productivity can be increased.

  Next, a vacuum cleaner 400 according to an embodiment of the present invention will be described with reference to FIGS.

  In the following, a case where the present invention is applied to a rechargeable vacuum cleaner 400 that can be used by appropriately switching between a stick type and a handy type will be described as an example. It can be applied to vacuum cleaners.

  9A and 9B show a vacuum cleaner equipped with an electric blower according to the present embodiment, wherein FIG. 9A is a perspective view when the stick type is used, and FIG. 9B is a side view when the handy type is used. is there.

  As shown in FIG. 9A, a vacuum cleaner 400 includes a dust collecting chamber 401 for collecting dust and an electric blower 200 (FIG. 1) for generating a suction airflow required for collecting dust. A main body 410, a telescopic pipe 402 provided to be extendable and retractable with respect to the cleaner main body 410, a grip part 403 provided at one end of the telescopic pipe 402, and a switch part for turning on and off the electric blower 200 provided at the grip part 403. 404 is provided.

  The vacuum cleaner 400 shown in FIG. 9A is in a stick state, in which the telescopic pipe 402 is extended. Further, a suction body 405 is attached to the other end of the cleaner body 410, and the cleaner body 410 and the suction body 405 are connected to each other by a connection portion 406.

  The vacuum cleaner 400 shown in FIG. 9B is in a handy state, in which the telescopic pipe 402 is stored in the main body 410 of the vacuum cleaner, and the grip portion 403 is close to the telescopic pipe 402 side. In addition, a handy grip portion 407 serving as a handle in a handy state is provided between the grip portion 403 and the dust collecting chamber 401 which are close to each other on the upper surface side of the cleaner body 410. In addition, a suction body (gap nozzle) 408 is attached to the other end of the cleaner body 410, and the cleaner body 410 and the suction body 408 are connected by a connection portion 406.

  In the above-described vacuum cleaner 400, by operating the switch unit 404 of the grip unit 403, the electric blower 200 (see FIG. 1) housed in the cleaner main body 410 operates to generate suction airflow. Then, dust is sucked from the mouthpieces 405 and 408 and collected in the dust collecting chamber 401 of the cleaner main body 410 through the connection portion 406.

  FIG. 10 is a vertical cross-sectional view of a cleaner body equipped with the electric blower according to the present embodiment. FIG. 10 shows a handy state, in which the mouthpiece 408 is removed from the cleaner body 410.

  As shown in FIG. 10, an electric blower 200 that generates a suction force, a battery unit 420 that supplies electric power to the electric blower 200, and a driving circuit 430 are provided inside the cleaner body 410.

  The air sucked in from the mouthpieces 405 and 408 (see FIGS. 9A and 9B) passes through the flow path 440 (see FIG. 9A) provided in the cleaner body 410 and is supplied to the electric blower 200. The dust is sent to the dust collection chamber 401 disposed in the front, and is collected in the dust collection chamber 401. The air after the dust is separated in the dust collection chamber 401 passes through the electric blower 200 and the driving circuit 430, and is discharged to the outside from an exhaust port (not shown) formed in the cleaner body 410.

  By mounting the electric blower 200 of this embodiment on a vacuum cleaner, harmonic noise of the rotation frequency of the vacuum cleaner 100 can be reduced, and a vacuum cleaner with a good audibility can be obtained.

  Note that the present invention is not limited to the above-described embodiment, and includes various modifications. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described above. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of one embodiment can be added to the configuration of another embodiment. Further, for a part of the configuration of each embodiment, it is possible to add, delete, or replace another configuration.

DESCRIPTION OF SYMBOLS 1 Centrifugal impeller 2 Fan casing 3 Guide blade 4 Rotating shaft 5 Housing 6 Rotor core 7 Stator 8 Fixing screw 9 Stator core 10, 11 Roll frame 12 Field winding 13, 14 Bearing 15 Spring 16 Bearing cover 17 Balance ring 18 Sleeve 19 Housing Supporting part 20 Screw hole 21 Fixing screw 22 Housing opening 23 Housing exhaust port 24 Cooling fin 25 Split core 26 Caulking part 27 Yoke part 28 Pole part 29 Teeth part 30 Slot part 31 Groove part 32 Projection part 33 Through hole 34, 37 Winding guide 35, 36 Fitting part 38 Mounting hole 39 Chamfer 200 Electric blower 201 Blower part 202 Motor part 400 Vacuum cleaner main body

Claims (4)

An electric motor having a rotor core and a stator core, a rotatable rotating shaft, the rotor core integrally molded near one end of the rotating shaft, and a rotating blade attached near the other end of the rotating shaft. A pair of bearings attached to the rotary shaft between the rotor core and the rotary blade, a housing for holding the pair of bearings, and a fan casing for covering the rotary blade, wherein the stator core has a plurality of the same shape. An annular yoke portion, a pole portion protruding from the yoke portion to the inner diameter side, and a tooth portion are formed at the tip of the pole portion, and the divided core is configured by connecting the divided cores.
An electric blower, wherein a winding frame of an insulating member that covers each of the split cores is arranged on the split core, and a connecting portion that connects the teeth portion by adjacent winding frames is provided.   The electric blower, wherein the connection portion has a portion that contacts the circumferential direction and the radial direction of the teeth portion.   3. The electric blower according to claim 1, wherein a length at which the connection portion is connected is shorter than a thickness of the stator core. 4.   An electric vacuum cleaner equipped with the electric blower according to claim 1.

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