JP2018182987A - Electric blower and vacuum cleaner mounting the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric blower and a vacuum cleaner in which a noise caused by the vibration of a stator is reduced.SOLUTION: An electric blower includes: an electric motor which includes a rotor core and a stator core; a revolving shaft which is freely rotated; the rotor core which is integrally formed in the vicinity of one end part of the revolving shaft; a rotary wing which is attached in the vicinity of the other end part of the revolving shaft; a pair of bearings which is attached to the revolving shaft between the rotor core and the rotary wing; a housing which holds the pair of bearings; and a fan casing which covers the rotary wing. The stator core is configured by connecting a plurality of split cores of an identical shape. Bobbins formed of insulating members to cover the respective split cores are arranged on the split cores. A connection member which joins a gap between each neighboring bobbins is provided.SELECTED DRAWING: Figure 6

Description

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

  In cordless vacuum cleaners and self-propelled vacuum cleaners whose demand has been rapidly increasing in recent years, an electric blower using a DC brushless motor to obtain sufficient output even with low voltage battery drive and reduce vibration and noise Is used.

  Moreover, in order to achieve miniaturization of the vacuum cleaner, miniaturization of the electric blower is also required. With regard to the 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.

  As a conventional motor-driven blower for vacuum cleaners, there exist some which are disclosed by Unexamined-Japanese-Patent No. 2016-153636 (patent document 1), for example.

  The motor-driven blower disclosed in Patent Document 1 includes “a rotary shaft provided rotatably, a bearing portion provided substantially at the center of the axial direction of the rotary shaft, and a centrifugal member provided at one end of the rotary shaft. Provided on the other end of the rotating shaft, a rotor, 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 facing the periphery of the rotor core And the ring member is larger than the specific gravity of the rotor core and is made of a nonmagnetic material. "

JP, 2016-153636, A

  In the motor-driven blower of Patent Document 1, the unbalance amount of the rotating body (rotor assembly) can be reduced to balance the ring member provided at the shaft end with the centrifugal impeller, and the vibration of the rotating body is reduced. The high-speed rotation of 80,000 revolutions per minute or more is possible, and the miniaturization of the electric blower is achieved. Moreover, the operation noise of the electric vacuum cleaner is also reduced by reducing the rotational vibration.

  However, when the electric blower is operated, the electromagnetic force generated between the rotor core and the stator core periodically changes as the rotor core rotates. The periodically changing electromagnetic force may cause the stator core to vibrate, which may generate noise. In addition, an insulating material winding frame is disposed around the stator core, and the field winding is wound via the winding frame, so that vibration of the stator core may be transmitted through the winding frame and noise may be generated from the winding frame. The

  SUMMARY OF THE INVENTION The object of the present invention is to solve the above-mentioned problems, suppress vibration generated from the stator section with a simple structure, reduce noise, in particular, reduce harmonics of rotation frequency (integer multiple of rotation frequency) noise. An object of the present invention is to provide an electric blower and an electric vacuum cleaner that can be designed.

  In order to solve the above problems, one of the representative electric blowers according to the present invention is integrally molded in the vicinity of one end portion of a rotary shaft and a rotary shaft provided with a rotor core and a stator core, which is rotatably provided. A rotor core, a rotary 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 for holding the pair of bearings, and a fan covering the rotary blade The stator core is configured by connecting a plurality of divided cores having the same shape, and a coil of an insulating member covering each of the divided cores is disposed on the divided cores, and a connection is formed to connect gaps between adjacent coils. It is achieved by providing the member.

  According to the present invention, it is possible to provide an electric blower capable of suppressing vibration of a motor stator portion and reducing noise, particularly harmonic noise of rotational frequency, and a vacuum cleaner including the same. is there.

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

(A) is an external view of the electric blower in embodiment of this invention, (b) is a longitudinal cross-sectional view of an electric blower. (A) is a top view of the stator core in the example of an embodiment of the present invention, (b) is a perspective view of the division core which constitutes a stator core. (A) is an exploded perspective view of a split core and a winding frame constituting the stator in the embodiment of the present invention, (b) is a perspective view in which the split core and the winding frame are fitted, (c) is a winding frame on the split core And the field winding is wound. (A) is an external appearance perspective view which looked at a stator in an example of an embodiment of the present invention from the fan casing side, (b) is a sectional view of a stator, (c) is an external appearance perspective view which looked at a stator from the anti fan casing side . (A) is an external appearance perspective view of the connection member which fixes the winding frames in embodiment of this invention, (b) is sectional drawing of a connection member. It is the appearance perspective view which looked at the stator which attached the connection member in the example of an embodiment of the present invention from the anti fan casing side. It is a frequency analysis result explaining the noise reduction effect by a connection member. It is an external appearance perspective view which shows the modification of the connection member of this invention. (A) is the external appearance perspective view which looked at the stator in other embodiment of this invention from the fan casing side, (b) is sectional drawing of the stator shown to (a). (A) is an external appearance perspective view which shows the connection member shown in FIG. 9, (b) is sectional drawing of a connection member. (A) is sectional drawing of the split core when the winding frame of other embodiment of this invention is used, (b) is the elements on larger scale of sectional drawing of a stator. FIG. 1 is a perspective view of a vacuum cleaner to which an electric fan according to an embodiment of the present invention is applied. It is sectional drawing which showed typically the cleaner body in the vacuum cleaner of FIG.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the present embodiment, the rotor is described using a centrifugal impeller.

  An electric vacuum cleaner 300 according to an embodiment of the present invention will be described with reference to FIGS. 12 and 13. FIG. 12 shows a perspective view of a vacuum cleaner to which the electric blower of the present embodiment is applied.

  As shown in FIG. 12, 100 is a vacuum cleaner main body for housing a dust collection chamber 101 for collecting dust and an electric blower 200 (FIG. 13) for generating suction air flow necessary for dust collection; A holding unit 100 is mounted, a grip unit 103 is provided at one end of the holding unit 102, and a switch unit 104 for turning on and off the electric blower 200 provided in the grip unit. A suction body 105 is attached to the other end of the holding portion 102, and the cleaner body 100 and the suction body 105 are connected by a connection portion 106. Reference numeral 107 denotes a charging stand for charging the battery unit 108 (FIG. 13).

  In the above configuration, when the switch section 104 of the grip section 103 is operated, the electric blower 200 stored in the cleaner body 100 is operated to generate suction air flow. Then, dust is sucked from the suction body 105 and collected in the dust collection chamber 101 of the cleaner body 100 through the connection portion 106.

Next, the cleaner body 100 will be described using a cross-sectional view schematically showing the cleaner body 100 in the electric vacuum cleaner shown in FIG. An electric blower 200 generating suction force, a battery unit 108 driving the electric blower 200, a drive circuit 109, and a dust collection chamber 101 are disposed inside the cleaner body 100.
The cleaner body 100 can be removed from the holding portion 102 and used as a handy cleaner, and the cleaner body 100 is provided with a body blip portion 110 and a suction opening 111. Reference numeral 112 (FIG. 12) denotes a main body switch that turns on and off the electric blower 200 when used as a handy cleaner. The main body switch 112 can be operated even when the cleaner main body 100 is attached to the holding portion 102.

Next, the electric blower 200 will be described with reference to the external view of the electric blower shown in FIG. 1 (a) and the longitudinal sectional view of the electric blower shown in (b). The electric blower 200 is roughly divided into a blower unit 201 and a motor unit 202. The fan unit 201 includes a centrifugal impeller 1 which is a rotary blade, a fan casing 2 for housing the centrifugal impeller 1, a plurality of diffuser blades 3a, and a plurality of return guide blades 3b on the back of the diffuser blades 3a. It comprises the guide wing 3. The fan casing 2 is provided with an air suction port 2 a. An airtight holding member 2 b using an elastic body is integrally formed on the fan casing 2 on the inner surface of the fan casing 2. In the present embodiment, the airtight holding member 2b and the fan casing 2 are integrally molded by insert molding.
The centrifugal impeller 1 is made of thermoplastic resin and is directly connected to the rotating shaft 4. Here, in the present embodiment, the centrifugal impeller 1 which is a rotary wing is press-fitted and fixed to the rotary shaft 4, but a screw is provided at the end of the rotary shaft 4 and the centrifugal impeller 1 is fixed using a fixing nut It is good.

  The motor unit 202 includes a rotor core 6 fixed to the rotary 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 side of the rotation shaft 4 opposite to the end to which the centrifugal impeller 1 is fixed, and is made of a rare earth bond magnet. The rare earth bond magnet is made by mixing a rare earth magnetic powder and an organic binder. As the rare earth bond magnet, for example, a samarium iron nitrogen magnet, a neodymium magnet, or the like can be used. The rotor core 6 is integrally formed on the rotating shaft 4. Although permanent magnets are used for the rotor core 6 in the present embodiment, there is no concern for this. For example, a reluctance motor, which is a type of non-commutator motor capable of high speed rotation of 80,000 or more per minute. You may use
The stator 7 is disposed on the outer peripheral side of the rotor core 6 and is fixed to the housing 5 by a fixing screw 8. The stator 7 has a stator core 9 (FIG. 2) formed by laminating electromagnetic steel plates in the rotational axis direction, and two winding frames 10 and 11 disposed around the stator core 9. 12 is wound. The field winding 12 is electrically connected to a circuit unit (not shown) provided in the electric blower 200. At an end portion of the winding frame 11, a connecting member 13 (FIG. 5) for fixing the winding frames 11 is inserted and fixed.

  Bearings 14, 15 are provided between the centrifugal impeller 1 and the rotor core 6, and the rotary shaft 4 is rotatably supported. A spring 16 is disposed between the bearing 14 and the bearing 15 in a compressed state to apply a preload to the bearings 14, 15. The bearings 14 and 15 and the spring 16 are contained in the bearing cover 17. A ring 18 for adjusting balance is attached to the end of the rotary shaft 4 with respect to the rotor core 6. By rotating the rotating body and scraping the rear surface of the centrifugal impeller 1 and the ring 18, two-plane balance correction can be performed. The balance adjustment ring 18 is a metal material having a specific gravity larger than that of the rotor core 6, and is manufactured by, for example, a sintered product such as a copper material or machining.

  A positioning sleeve 19 for positioning the bearing 15 is disposed between the rotor core 6 and the bearing 15. The housing 5 is a synthetic resin material, and has a support portion 20 for fixing a bearing cover 17 including the bearings 14 and 15. The bearing cover 17 is a nonmagnetic metal material and integrated with the resin housing 5 by insert molding. Preferably, the bearing cover 17 is a material having a high thermal conductivity, such as an aluminum alloy.

  At the end of the support portion 20 of the resin housing 5, a screw hole 21 extending in the rotational axis direction is formed. The fixing screw 22 can be screwed into the screw hole 21, and the guide wing 3 is fixed to the resin housing 5 by the screwing of the fixing screw 22. The housing 5 is provided with an opening 23 so that the air flows into the housing 5 and an exhaust port 24 for discharging the air to the outside of the electric blower 200. The stator core 9 and the winding frame 11 of the stator 7 disposed 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 rotary wing, 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 air flow that has flowed out of the centrifugal impeller 1 is guided to the guide vanes 3.

The guide vanes 3 are provided with a plurality of diffuser vanes 3a, and the air flow is decelerated between the vanes of the diffuser vanes 3a to convert kinetic energy of the air flow into pressure energy to increase pressure. The air flow that has flowed out from between the diffuser vanes 3a flows from the flow path formed by the inner surface of the fan casing 2 and the guide vanes 3 into the return guide vanes 3b.
When the diffuser blade 3a bites into the airtight holding member 2b of the fan casing 2, the airtightness of the fan casing 2 and the diffuser blade 3a is maintained. Thereby, the leakage between the deuser blades 3a of the guide vanes 3 can be prevented, and the fan efficiency can be improved. In the present embodiment, a vane-mounted diffuser is used, but a vaneless diffuser may be used.

  The air flow passing through the return guide vanes 3b flows into the housing 5 through the opening 23 of the housing 5, and cools the cooling fins 25 of the bearing cover 17. Accordingly, the bearings 14, 15 are cooled via the bearing cover 17. Do. Further, the rotor core 6, the stator core 9, the field winding 12 and the like are cooled and discharged to the outside. By this, each part in the housing 5 is cooled. Part of the air flow that has passed through the return guide vanes 3 b is exhausted from the exhaust port 24 of the housing 5 to the outside.

  The stator 7 of the motor unit 202 according to an embodiment of the present invention will be described with reference to FIGS. 2 to 6. 2 (a) is a plan view of the stator core 9 in the embodiment of the present invention, FIG. 2 (b) is a perspective view of the split core 26 constituting the stator core 9, FIG. 3 (a) is a split core 26 and the stator 7 (B) is a perspective view in which the divided core 26 and the winding frame 10, and the winding frame 11 are fitted; (c) is the divided core 26 with the winding frame 10 and the winding frame 11; FIG. 4 (a) is an external perspective view of the stator 7 viewed from the fan casing 2 side, FIG. 4 (b) is a cross-sectional view of the stator 7, FIG. 4 (c) is a stator FIG. 5 (a) is an external perspective view of the connecting member 13 for fixing the winding frames 11 in the embodiment of the present invention, and FIG. 5 (b) is a cross section of the connecting member. Fig. 6 is an anti-fan case of the stator 7 to which the connecting member 13 according to the present invention is attached It is an external perspective view from grayed 2 side.

  First, the stator core 9 constituting the stator 7 according to one 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 divided cores 26 of the same shape. The split cores 26 laminate the electromagnetic steel plates in the rotational axis direction, and fix the electromagnetic steel plates to each other by the caulking portion 27. The split core 26 includes a yoke portion 28, a pole portion 29, and a teeth portion 30. A slot 31 in which the field winding 12 is inserted is formed by the space surrounded by the yoke portion 28 of each split core 26, the pole portion 29, and the teeth portion 30.

  A substantially square groove 32 connecting the split cores 26 to each other is provided at an end of the yoke 28 in the circumferential direction, and a substantially square projection 33 is provided at the other end. The stator core 9 is integrally formed by fitting the divided cores 26 together. In the stator 7, the winding frames 10 and 11 are disposed on each of the divided cores 26 (see FIG. 3B), and the field winding 12 is mounted on the pole portion 29 of each divided core 26 via the winding frames 10 and 11. After being wound (see FIG. 3C), the split cores 26 are connected and integrally formed. A through hole 34 for fixing to the housing 5 is provided on the outer peripheral side of the circumferential center of the yoke portion 28 of the split core 26, and is fixed to the housing 5 by the fixing screw 8 together with the winding frame 11.

By using the stator core 9 as the split core 26, the material utilization rate of the electromagnetic steel sheet can be improved and the material cost can be reduced as compared with the case of using the integral core. Further, since the periphery of the pole portion 29 for winding the field winding 12 is open, the winding process can be easily performed, and the productivity can be enhanced. Furthermore, since the field winding 12 can be wound neatly, the length of the field winding 12 can be shortened, and the efficiency of the electric blower 200 can be improved.
In addition, by providing the caulking portions 27 of each of the split cores 26 at three ends of the yoke portion 28 and the pole portion 29, the rigidity of the single split core 26 is improved. The split cores 26 can be firmly connected to each other by the substantially square groove 32 at the circumferential end of each split core 26 and the substantially square projection 33, and it is an integral type without requiring welding or the like. The rigidity of the stator core 9 can be increased. Here, in the present embodiment, the circumferential end of the split core 26 is connected by the substantially square groove 32 and the substantially square projection 33, but the substantially trapezoidal shape, the substantially triangular shape, the substantially elliptical shape, etc. It is sufficient if the divided cores 26 can be firmly connected to each other.
Next, the stator 7 according to an embodiment of the present invention will be described with reference to FIGS. 3 and 4. Two winding frames 10 and a winding frame 11 are disposed around the split core 26 according to the embodiment of the present invention. The winding frame 10 and the winding frame 11 are synthetic resin materials having insulation properties, and are fitted so as to prevent the field winding 12 from being in direct contact with the split core 26. In addition, the division | segmentation core 26 shown to Fig.3 (a) has integrated and displayed the laminated electromagnetic steel plate.

The winding frame 10 and the winding frame 11 may be any ones that are easy to mold and have electrical insulation, heat resistance and rigidity to some extent, and examples thereof include polybutylene terephthalate resin (PBT) and polyethylene terephthalate resin ( PET) and those containing glass fiber are desirable.
The winding frame 10 has a part on the inner diameter side of the inner peripheral surface 28a and the upper surface 28b on the inner diameter side of the yoke portion 28 of the split core 26 from the direction indicated by the arrow A shown in FIG. And the upper surface 29 b and the side surface 30 a and the upper surface 30 b of the tooth portion 30 are integrally molded. Further, a winding guide 35 for winding the field winding 12 is formed on the winding frame 10.

  The winding frame 11 is a part of the outer peripheral surface 28c on the outer diameter side of the yoke portion 28 of the divided core 26 in the direction indicated by the arrow B shown in FIG. And the lower surface 30c of the tooth portion 30 are integrally molded. Further, a winding guide 36 for winding the field winding 12 and a mounting hole 37 (see FIG. 4C) for fixing the stator 7 to the housing 5 are formed in the winding frame 11.

As shown in FIGS. 3B and 3C, by fitting the winding frame 10 and the winding frame 11 to the split core 26, the slot 31 is covered with the winding frame 10 and the winding frame 11 having insulation properties. Therefore, since the field winding 12 and the split core 26 do not come in direct contact with each other, they can be electrically isolated. As a result, the field winding 12 can be wound on the split core 26 with strong tension, so that the split core 26, the winding frame 10, and the winding frame 11 can be brought into close contact and integrated.
Winding guides 35 and 36 are formed on the winding frames 10 and 11, respectively, and serve as guides for winding the field winding 12 on the pole portion 29, and the field winding 12 protrudes to the teeth portion 30 side. And the field winding 12 can be wound with a strong tension.
The field winding 12 is wound around the split core 26, and then the split cores 26 (FIG. 3C) are fitted to form the stator 7 (FIG. 4). As shown in FIG. 4, the teeth portion 30 of the stator 7 and the winding guides 35 and 36 have a substantially cylindrical shape. As shown in FIG. 1B, the bearing cover 17 is disposed on the inner diameter side of the substantially cylindrical winding guide 35, and the balance adjusting ring 18 is disposed on the inner diameter side of the substantially cylindrical winding guide 36. Be placed. Each tooth portion 30, each winding guide 35, and each winding guide 36 are formed with a gap C, respectively. Although the stator 7 has three slots in this embodiment, the number of slots may be increased, such as four slots or six slots, without being limited by this. It is sufficient to set the number of magnetic poles and the number of slots of the rotor core 6 appropriately. .
Next, the connection member 13 according to the embodiment of the present invention will be described with reference to FIGS. 5 and 6. In the present embodiment, the connecting member 13 shown in FIG. 5 is disposed and fixed at the end of the substantially cylindrical winding guide 36. In the connection member 13, a connecting portion 39 is formed on an end face 38 a of the annular support portion 38, and a substantially triangular fixing portion 40 is formed on a side surface 39 a of the connecting portion 39. The connecting member 13 is a nonmagnetic synthetic resin material, which is integrally formed of polybutylene terephthalate resin (PBT), polyethylene terephthalate resin (PET), or those containing glass fiber.
The connecting portion 39 is a substantially rectangular flat plate, and is inserted into a gap C (see FIG. 4C) between the winding guides 36 to connect and fix the winding guides 36 in the circumferential direction. The fixed surface 40a on the inner diameter side of the fixed portion 40 is formed in an arc shape so as to be connected and fixed to the outer diameter of the winding guide 36, and the field winding 12 is wound around the field winding 12 The fixing portion 40 has a substantially triangular shape so as to be able to arrange 12, that is, the space between the fixing portions 40 is formed.
The thickness t1 of the connecting portion 39 on the support portion 38 side is larger than the thickness t2 of the tip of the connecting portion 39. Further, the thickness t1 on the side of the support portion 38 is larger than the gap C between the winding guides 36 by approximately 0.1 to 0.3 mm. Since the thickness of the connecting portion 39 is t1> t2, it is suitable for smoothly releasing the molded product from the mold. Further, when the connecting member 13 is inserted into the gap C of the winding guide 36, it can be smoothly inserted.
Furthermore, since the thickness t1 on the support portion 38 side is approximately 0.1 to 0.3 mm larger than the gap C between the winding guides 36, the end face of the winding guide 36 and the end face 38a of the support portion 38 are Since the winding guide 36 is spread to the outer diameter side when contacting, the outer diameter of the winding guide 36 and the inner surface 40 a of the fixing portion 40 are in close contact, and the connection member 13 can be held firmly.
Thereby, the circumferential direction and the radial direction of the winding guide 36 can be strongly restrained. Furthermore, since the end face in the rotational axis direction of the winding frame 11 and the end face 38a of the connection member 13 can be connected and fixed, the rotational axis direction of the winding guide 36 can also be restrained.
In the present embodiment, the fixing portion 40 has a substantially triangular shape. However, the fixing portion 40 does not suffer from this, and may have a substantially square shape or the like if not interfering with the field winding 12. It is sufficient that the outer diameter of the winding guide 11 has substantially the same curvature and that the connecting member 13 and the winding guide 11 can be in close contact with each other.
When the electric blower 200 is operated, an electromagnetic force generated between the rotor core 6 and the teeth portion 30 of the stator 7 generates a suction force and a repulsive force in the teeth portion 30 of the stator 7. A periodically changing force is applied to the unit 30. The periodically changing force causes the stator core 9 to vibrate and is likely to generate harmonics of the rotation frequency (integer multiple of the rotation frequency) noise.
In the present embodiment, the winding frames 10 and 11 are formed in tight contact with the stator core 9, and the connecting member 13 can restrain the radial direction, the circumferential direction, and the rotational axis direction of the winding guide 36. The vibration of the stator 7 can be suppressed, and harmonic noise of the rotational frequency can be reduced.
Further, since the connecting member 13 formed in one piece is attached to the winding frame 11, the connecting member 13 can be easily attached after assembling the stator 7 (FIG. 4) or after assembling the electric blower 200, Assemblability is good without the need for special production equipment. Therefore, the vibration which generate | occur | produces from a stator part can be suppressed by simple structure, and reduction of noise can be aimed at.
Further, since the connecting member 13 is made of a nonmagnetic synthetic resin material, the connecting member 13 is not affected by the attraction force of the magnet of the rotor core 6, and a low noise electric fan excellent in assemblability can be obtained.

FIG. 7 is a view showing the noise reduction effect of the connection member 13 of the present invention, which is the result of frequency analysis of the driving noise. The horizontal axis indicates frequency, and the vertical axis indicates sound pressure level. The solid line indicates the present embodiment, and the broken line indicates the conventional example. In the conventional example, the rotational frequency noise and the harmonic noise of the rotational frequency are high, but the harmonic noise is significantly reduced by attaching the connecting member 13 of the present embodiment to the winding guide 36 of the winding frame 11 You can see that The lower the harmonic noise, the better the hearing.
In the conventional example, when the electric blower 200 is operated, the stator core 9 vibrates due to the electromagnetic excitation force that changes periodically in the teeth portion 30 of the stator 7, and the bobbins 11 closely attached to the stator core 9 vibrate. There was noise. However, in the present embodiment, the winding guides 36 of each winding frame 11 can be integrated by restraining the circumferential direction, the radial direction, and the rotational axis direction by the connecting member 13 made of one component. Rigidity can be increased and noise can be reduced. In particular, harmonic noise at the rotational frequency can be reduced, and the motor-driven blower 200 good in hearing can be obtained.

  Also, after the field winding 12 is wound around the split core 26, the stator 7 is assembled. However, due to the field winding 12, the winding frame guides 35, 36 may be deformed, for example, to the inner diameter side, and individual differences may occur. . The thickness t1 of the connection portion 39 on the support portion 38 side of the connection member 13 is larger by about 0.1 to 0.3 mm than the gap C between the winding guides 36, and the thickness t2 of the tip of the connection portion 39 is t1. Since t2 is used, the connection member 13 can be easily inserted into the winding guide 36, and the winding guide 36 can be expanded to the outer diameter side. Therefore, even if individual differences occur, the circumferential direction, the radial direction, and the rotation axis The direction can be strongly restrained. In addition, by fixing to the fixing | fixed part 40 of the connection member 13 using an adhesive agent, it can restrain more firmly, and it can be effective also as drop-off prevention of the connection member 13. FIG.

  According to the electric blower 200 of the present embodiment described above, by using the stator core 9 as the split core 26, the material utilization rate of the magnetic steel sheet can be improved, and the material cost can be reduced. Also, the winding process for winding the field winding 12 can be easily performed, and the productivity can be enhanced. Furthermore, since the field winding 12 can be wound neatly, 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 caulking portion 27 on each split core 26, the rigidity of the split core 26 alone is improved. Further, the split cores 26 can be firmly connected to each other by the groove 32 and the protrusion 33 at the circumferential direction end of each split core 26, and the rigidity of the integral stator core 9 is increased without the need for welding or the like. be able to.
Furthermore, winding guides 35 and 36 are formed on the winding frames 10 and 11, respectively, to prevent the field winding 12 from protruding to the teeth portion 30 side, and the field winding 12 is wound with a strong tension. As a result, the split core 26, the winding frame 10, and the winding frame 11 can be brought into close contact and integrated.
The thickness t1 of the connection portion 39 on the support portion 38 side of the connection member 13 is approximately 0.1 to 0.3 mm larger than the gap C between the winding guides 36, and the thickness t2 of the tip of the connection portion 39 is And t1, the connection member 13 can be smoothly released from the mold.
Furthermore, when the connection member 13 is inserted into the gap C of the winding guide 36, the connection member 13 can be smoothly inserted, and the inner surface 40a of the fixing portion 40 of the connection member 13 closely contacts the outer diameter of the winding guide 36. In addition to holding, the circumferential direction of the winding guide 36, the radial direction and the rotational axis direction can be strongly restrained and integrated. For this reason, the rigidity of the winding guide 36 can be enhanced, noise from the stator 7 can be reduced, and in particular, harmonic noise of the rotational frequency can be reduced, and the electric blower 200 good in hearing can be obtained.

  Furthermore, since the connecting member 13 formed in one part can be attached to the winding frame 11, the connecting member 13 can be easily attached after assembling the stator 7 or after assembling it as the electric blower 200, special production equipment Assemblability is good without the need for

  Further, since the connecting member 13 is made of a nonmagnetic synthetic resin material, the connecting member 13 is not affected by the attraction force of the magnet, and a low noise electric fan excellent in assemblability can be obtained. Therefore, even if stator core 9 is divided core 26, rigidity of winding frame 11 can be increased with a simple structure, and vibration generated from the stator portion can be suppressed, and noise can be reduced.

Next, modified examples of the connection member 13 will be described. FIG. 8 is an external perspective view of another connection member 41. As shown in FIG. The connection member 41 has a shape that does not include the support portion 38 of the connection member 13 shown in FIG. 5, and one connection member is disposed at each gap between the winding guides 36. In the present embodiment, since three slots are used, the circumferential direction and the radial direction of the winding guide 36 are restrained using three connecting members 41. In the support member 41, a substantially rectangular fixed portion 43 is formed on a substantially rectangular flat connection portion 42 and a side surface 42a of the connection portion 42.
The thickness t1 of the connecting portion 42 is larger than the thickness t2 of the tip of the connecting portion 39. The thickness t1 of the connecting portion 42 is larger than the gap C between the winding guides 36 by about 0.1 to 0.3 mm. Since the thickness of the connecting portion 42 is t1> t2, it is suitable for smoothly releasing the molded product from the mold.
Also in the connecting member 41 shown in FIG. 8, the circumferential direction and radial direction of the winding guide 36 can be restrained, noise from the stator 7 can be reduced, and in particular, harmonic noise at the rotational frequency can be reduced. .

By using such a connecting member 41, the material cost and mass of the connecting member 41 can be reduced, and the die for manufacturing the connecting member 41 can be made smaller, so that the manufacturing cost can be reduced. Can. In addition, even if the gap C of the winding guide 36 varies, the rigidity of the winding guide 36 is controlled uniformly by appropriately setting and managing the pushing force in the direction of the rotation axis of the connecting member 41 to be inserted last. And the variation can be reduced.
Next, the case where another connecting member 44 is attached to the winding frame 10 will be described with reference to FIGS. 9 (a) is an external perspective view of the stator 7 in which the connecting member 44 is attached to the winding frame 10, FIG. 9 (b) is a sectional view of the stator 7 shown in FIG. FIG. 6B is a cross-sectional view of the connection member 44. FIG. In FIG. 9, the same parts as those of the stator 7 used in the first embodiment shown in FIG.
The connection member 44 shown in FIG. 9 is disposed and fixed inside the substantially cylindrical winding guide 35, and the gap C of the teeth portion 30 of the stator 7 is connected and fixed via the winding frame 35. The connecting member 44 has a connecting portion 46 and a fixing portion 47 on the end face of the substantially conical supporting portion 45 in accordance with the shape of the winding frame 10. The connecting member 44 is a nonmagnetic synthetic resin material, which is integrally molded of polybutylene terephthalate resin (PBT), polyethylene terephthalate resin (PET), or those containing glass fiber.
The connecting portion 46 is inserted into the gap C of the winding frame 35 covering the teeth portion 30, and connects and fixes the winding frames 35 in the circumferential direction, and connects and fixes the radial direction of the winding frame at the inner diameter surface of the fixing portion 47 Do. Further, fixing of the winding frame 35 in the rotational axis direction is performed by the support portion 45.
As a result, the circumferential direction of the teeth 30, which receives the electromagnetic excitation force, and the radial direction and the rotational axis direction can be strongly restrained, noise from the stator 7 can be reduced, and harmonic noise of the rotational frequency is particularly reduced. can do. The embodiment is characterized in that when the stator core 9 is manufactured by the split core 26, at least one of the winding frames is firmly connected by the connection member.
Next, a reel according to another embodiment of the present invention will be described. FIG. 11A is a cross-sectional view of the split core 26 when another winding frame is used, and FIG. 11B is a partially enlarged view of a cross-sectional view of the stator 7. In FIG. 11, the same parts as those of the stator 7 used in the first embodiment shown in FIG.
The difference between the reels 10 and 11 shown in FIG. 4 and the reels 48 and 49 shown in FIG. 11 will be described. Although the winding frame 10 and the winding frame 11 shown in FIG. 4 are separated from each other, when the winding frame 48 and the winding frame 49 of the other embodiment of the present invention are assembled as the stator 7 as shown in FIG. 4 is different from the winding frame shown in FIG. 4 in that the respective winding frames are connected to each other.
At the circumferential end of the winding frame 48, protrusions 48a and 48b for connecting the winding frames 48 are provided, and at the other end, fitting portions 48c and 48d are provided. Further, at the circumferential end of the winding frame 49, a projection 49a connecting the winding frames 49 with each other and a fitting portion 49b are provided at the other end. Winding guides (not shown) are formed on the winding frames 48 and 49, respectively.
The winding frame 48 and the winding frame 49 are fitted to the split core 26, the field winding 12 is wound, and then the split cores 26 are fitted to each other to form the stator 7. The protrusion 48a and the fitting portion 48c on the yoke portion 28 side of the winding frame 48, the protrusion 48b and the fitting portion 48d on the tooth portion 30 side, and the protrusion 49a and the fitting portion 49b of the winding frame 49 are respectively connected. .
Thereby, the circumferential direction and the radial direction of the winding frames 48 and 49 can be restrained, the rigidity of the winding frames 48 and 49, that is, the rigidity of the stator 7 can be increased, and vibration and noise from the stator 7 can be reduced. It can be reduced. By attaching the connecting member of the present invention to the winding guide portions of the winding frames 48 and 49, it is possible to further reduce the vibration and noise from the stator 7, and in particular to reduce the harmonic noise of the rotational frequency.
In the present embodiment, the winding frame 48 connects the projection 48a and the fitting portion 48c, and the projection 48b and the fitting portion 48d at two locations, respectively. Only the location may be used, as long as the circumferential direction and the radial direction of the winding frame 48 can be restrained.

By mounting the electric blower 200 according to the present embodiment to a vacuum cleaner, harmonic noise of the rotational frequency of the vacuum cleaner 100 can be reduced, and a vacuum cleaner good in hearing can be obtained.
The present invention is not limited to the embodiments described above, but includes various modifications. For example, the above-described embodiments are described in detail in order to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the described configurations. Also, part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. In addition, with respect to a part of the configuration of each embodiment, it is possible to add, delete, and replace other configurations.

DESCRIPTION OF SYMBOLS 1 centrifugal impeller 2 fan casing 3 guide wing 4 rotating shaft 5 housing 6 rotor core 7 stator 8 fixing screw 9 stator core 10, 11 winding frame 12 field winding 13 connecting member 14, 15 bearing 16 spring 17 bearing cover 18 balance ring 19 Sleeve 20 housing support 21 screw hole 22 fixing screw 23 housing opening 24 housing exhaust 25 cooling fin 26 split core 27 caulking portion 28 yoke portion 29 pole portion 30 teeth portion 31 slot portion 32 groove portion 33 protrusion 34 through hole 35, 36 Winding guide 37 Mounting hole 38, 45 Support part 39, 42, 46 Connecting part 40, 43, 47 Fixing part 41 Other connecting member 44 Other connecting member 48, 49 Other winding frame 100 Electric vacuum cleaner body 200 Electric blower 201 blower section 202 electricity Machine part

Claims (5)

An electric motor comprising a rotor core and a stator core; a rotary shaft provided rotatably; a rotor core integrally formed near one end of the rotary shaft; and a rotary wing mounted near the other end of the rotary shaft; A pair of bearings attached to the rotating shaft between the rotor core and the rotor, a housing for holding the pair of bearings, and a fan casing covering the rotor;
The stator core is configured by connecting a plurality of divided cores having the same shape, and the divided cores are provided with a winding frame of an insulating member covering each divided core, and a connecting member is provided to connect gaps between adjacent winding frames. Electric blower characterized by   The motor-driven blower according to claim 1, wherein the connecting member includes a support portion, a connection portion connecting a gap extending from the support portion, and a fixing portion at the connection portion.   The electric blower according to any one of claims 1 to 2, wherein a plate thickness of the connecting portion on the support portion side is larger than a plate thickness of an open end of the connecting portion.   The electric blower according to claim 3, wherein a plate thickness on the support portion side is larger than a gap of the winding frame by 0.1 to 0.3 mm.   A vacuum cleaner equipped with the electric blower according to any one of claims 1 to 4.

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