JP7426318B2 - Electric motors, electric blowers and vacuum cleaners - Google Patents

Description

The present invention relates to an electric motor, an electric blower, and a vacuum cleaner.

Electric motors are becoming faster and faster with the aim of making electric motors and mechanical devices smaller and lighter. In particular, cordless vacuum cleaners, whose demand has been increasing rapidly in recent years, are equipped with brushless electric motors that can rotate at over 80,000 revolutions per minute in order to reduce the fan diameter and weight of electric blowers. When the speed of an electric motor is increased, the frequency of the magnetic flux flowing through the core becomes higher, which increases iron loss and friction loss of bearings. Furthermore, when the electric motor is downsized, the amount of heat generated per volume increases, the heat radiation area decreases, and the temperature rises. An increase in loss and a rise in temperature both lead to a decrease in motor efficiency and hinder the realization of miniaturization through higher speeds.
Slotless motors that do not have teeth, which are the sites where iron loss occurs, and slotted motors that have smaller teeth are known as structures that suppress the increase in iron loss that occurs as motor speeds increase.

Patent Document 1 describes a permanent magnet type motor having a stator having windings and an iron core and a rotor having permanent magnets constituting a plurality of magnetic poles, in which the winding is formed by a coil having a plurality of concentratedly wound air cores. A permanent magnet type motor is described in which the iron core has teeth inserted into the air core of the coil.

Japanese Patent Application Publication No. 2004-187344

The electric motor described in Patent Document 1 is configured such that the angular width of the teeth is narrower and the degree of flatness of the coil is larger than that of a general electric motor. The number of flux linkages is increased compared to a slotless motor, and the magnetic flux created by the windings is dispersed to reduce the effects of magnetic saturation. On the other hand, by providing the teeth, a magnetic attraction force acts between the permanent magnets of the rotor and the teeth, generating a force that draws the teeth inward in the radial direction, which may cause noise when the motor is driven. .

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide an electric motor, an electric blower, and a vacuum cleaner that reduce the magnetic attraction force acting on the teeth of the electric motor and suppress noise when the electric motor is driven. Take it as a challenge.

In order to solve the above problems, an electric motor of the present invention includes a stator having a core, a coil, and an insulating bobbin, and a rotor having a permanent magnet. The teeth core is fixed to the insulating bobbin, and a gap is provided between the teeth core and the ring core.

According to the present invention, it is possible to provide an electric motor, an electric blower, and a vacuum cleaner that reduce the magnetic attraction force acting on the teeth of the electric motor and suppress noise when the electric motor is driven.

FIG. 1 is a perspective view of the electric motor according to the first embodiment of the present invention, viewed diagonally from the front and above. FIG. 2 is a cross-sectional view of the electric motor of FIG. 1; FIG. 7 is a diagram showing an analysis result of the magnetic attraction force acting on the tee core and the ring core when the radial width of the gap is large while driving the electric motor according to the first embodiment. FIG. 7 is a diagram showing an analysis result of the magnetic attraction force acting on the tee core and the ring core when the radial width of the gap is small while driving the electric motor according to the first embodiment. FIG. 3 is a diagram showing the relationship between the size of the gap of the electric motor and the size of pulsation of magnetic attraction force according to the first embodiment. FIG. 3 is a diagram showing the relationship between the gap size and the average value of magnetic attraction force of the electric motor according to the first embodiment. FIG. 3 is a sectional view of an electric motor according to a second embodiment of the present invention. FIG. 8 is a side view showing the configuration of a tee core and an insulating bobbin of the electric motor shown in FIG. 7; FIG. 3 is a sectional view of an electric motor according to a third embodiment of the present invention. 10 is a side view showing the configuration of a tee core and an insulating bobbin of the electric motor shown in FIG. 9. FIG. FIG. 7 is a sectional view of an electric motor according to a fourth embodiment of the present invention. It is a sectional view of the electric motor concerning the 5th embodiment of the present invention. It is a sectional view of an electric blower provided with an electric motor concerning a 6th embodiment of the present invention. It is a perspective view at the time of using the vacuum cleaner concerning the 7th embodiment of the present invention as a stick type. It is a perspective view at the time of using the vacuum cleaner based on the said 7th Embodiment as a handy type. It is a longitudinal cross-sectional view of the vacuum cleaner main body concerning the said 7th Embodiment.

Embodiments of the present invention will be described in detail below with reference to the drawings.
(First embodiment)
DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, modes for carrying out the present invention (hereinafter referred to as "embodiments") will be described in detail with reference to the drawings as appropriate. Note that in each embodiment, similar components are given the same reference numerals, and description thereof will be omitted.

FIG. 1 is a perspective view of an electric motor 100 according to a first embodiment of the present invention, viewed obliquely from the front and above. In addition, below, the right side of the electric motor 100 will be referred to as the right side, and the left side will be referred to as the left side. FIG. 2 is a cross-sectional view of the electric motor 100 of FIG.

As shown in FIGS. 1 and 2, the electric motor 100 includes a stator 1 and a rotor 2 disposed on the inner peripheral side of the stator 1 with an air gap interposed therebetween.
The electric motor 100 includes a stator 1 having a core 10 (see FIG. 2), a coil 13, and an insulating bobbin 12, and a rotor 2 having a permanent magnet 21.
The core 10 is divided into a ring core 11 which is a yoke portion and a teeth core 14 which is a teeth portion, and the teeth core 14 is fixed to an insulating bobbin 12.
The electric motor 100 is characterized in that a gap 15 is provided between the tee core 14 and the ring core 11.

<Configuration of stator 1>
The stator 1 includes a cylindrical ring core 11, an insulating bobbin 12 disposed on the inner circumferential side thereof, a coil 13 wound around the insulating bobbin 12, and a coil 13 that is housed in the insulating bobbin 12 via a gap 15 between the ring core 11 and the insulating bobbin 12. and a tee score 14.

There are three tee cores 14 and three coils 13 each, and they are arranged at intervals of 120 degrees in the circumferential direction. Three-phase alternating current currents whose phases are shifted by 120 electrical degrees are applied to the coils 13 to form a rotating magnetic field.
The ring core 11 and the tooth core 14 can be constructed by laminating, for example, electromagnetic steel sheets in the axial direction (in a direction perpendicular to the cross-sectional view of FIG. 2). The tee cores 14 may be stacked in the circumferential direction (rotation direction of the rotor 2).

The insulating bobbin 12 has an inner circumferential portion 121 extending in the circumferential direction between the permanent magnet 21 and the tooth core 14, an outer circumferential portion 122 extending in the circumferential direction between the teeth core 14 and the ring core 11, and an inner circumferential portion 121. It includes a wall portion 123 that connects the outer peripheral portion 122 in the radial direction.
The insulating bobbin 12 can be made of resin, for example. When a resin reinforced with glass fiber or the like is used, creep due to heat is less likely to occur, and the coil is less likely to be deformed during winding, making it possible to reduce manufacturing variations during mass production.

The insulating bobbin 12 has an inner circumferential side connected in a cylindrical shape (see inner circumferential part 121 in FIG. 2), and the tee core 14 is inserted into the insulating bobbin 12 from the outer circumferential side, for example, and is received by the cylindrical part on the inner circumferential side. I can do it. After the coil 13 is wound around the insulating bobbin 12 into which the tee core 14 is inserted, it is fixed to the ring core 11 by press fitting or with an adhesive.
Here, the tooth core 14 is fixed against the magnetic attraction force from the permanent magnet 21 by contacting the insulating bobbin 12 on the inner circumferential side facing the permanent magnet 21, and on the outer circumferential side facing the ring core 11, it is fixed against the magnetic attraction force from the permanent magnet 21. A gap 15 (void) serving as a resistance is provided.

<Configuration of rotor 2>
The rotor 2 includes a cylindrical permanent magnet 21 and a shaft 22 disposed on the inner peripheral side thereof.
The number of poles of the permanent magnet 21 is, for example, four, and the magnetization distribution is polar anisotropic or Halbach array. Torque is generated by the magnetic interaction between the magnetic poles of the rotor 2 and the rotating magnetic field of the stator 1, and the rotor 2 rotates in the circumferential direction.

The operation of the electric motor 100 configured as described above will be described below.
First, the magnetic attraction force acting on the core 10 will be described.
3 and 4 are diagrams showing the analysis results of the magnetic attraction force (radial component Fr of electromagnetic force) that acts on the tooth core 14 and the ring core 11 when the electric motor 100 is driven. 3 shows a case where the radial width of the gap 15 between the tee core 14 and the ring core 11 is large (reference value: 1), and FIG. This is the case when the radial width of is small (reference value: 0). The horizontal axis in FIGS. 3 and 4 is the rotation angle θ of the rotor 2.

As shown in FIG. 3, when the gap 15 between the tee core 14 and the ring core 11 is small, the Fr of the tee core pulsates greatly. On the other hand, as shown in FIG. 4, when the gap 15 between the tee core 14 and the ring core 11 is large, the pulsation is significantly reduced.

Next, the size of the gap 15 and the pulsation of the magnetic attraction force will be described.
FIG. 5 is a diagram showing the relationship between the size of the gap 15 and the pulsation size (Fr_pp) of the magnetic attraction force. The horizontal axis in FIG. 5 is the radial width of the gap 15 between the tee core 14 and the ring core 11.
As shown in FIG. 5, the larger the gap 15 between the tee core 14 and the ring core 11, the smaller the magnetic attraction force pulsations of the tee core 14. This is because the gap 15 between the teeth core 14 and the ring core 11 widens, and the teeth core 14 receives not only the magnetic attraction force in the inner circumferential direction from the permanent magnet 21, but also the outer circumferential direction due to the interaction with the ring core 11. This is thought to be because the magnetic attraction force also acts, and the forces in opposite directions cancel each other out.

Next, the relationship between the size of the gap 15 and the average value of the magnetic attraction force will be described.
FIG. 6 is a diagram showing the relationship between the size of the gap 15 and the average value (Fr_ave) of the magnetic attraction force. The horizontal axis in FIG. 6 is the radial width of the gap 15 between the tee core 14 and the ring core 11.
As shown in FIG. 6, the larger the gap 15 between the tee core 14 and the ring core 11, the larger the magnetic resistance, and the smaller the average value (Fr_ave) of the magnetic attraction force acting on the ring core 11.

As described above, the electric motor 100 of the present embodiment includes a stator 1 having a core 10, a coil 13, and an insulating bobbin 12, a rotor 2 having a permanent magnet 21, a ring core 11 as a yoke portion, and an insulating bobbin. 12 and includes a teeth core 14 which is a teeth portion, and a gap 15 provided between the teeth core 14 and the ring core 11.

In the conventional example, the magnetic attraction force acting on the tee core is large, and in order to firmly fix the tee core, it is necessary to fit it with the ring core or adhere it to the ring core.

In contrast, in this embodiment, the gap 15 provided between the tee core 14 and the ring core 11 can reduce the pulsation of the magnetic attraction force acting on the tee core 14 (see FIG. 6). Thereby, the tee core 14 can be inserted and fixed into the insulating bobbin 12 without fitting the ring core 11 or bonding it to the ring core 11. Moreover, the electromagnetic vibration of the motor caused by the pulsation of the magnetic attraction force acting on the tee core 14 can be reduced (see FIGS. 3 and 4), and the noise when the motor is driven can be reduced.
In this way, by reducing the magnetic attraction force acting on the teeth core 14, it is possible to provide an electric motor 100 that achieves fixing of the teeth core 14 with the insulating bobbin 12 and reduces electromagnetic noise of the motor. .

(Second embodiment)
FIG. 7 is a sectional view of an electric motor 100A according to a second embodiment of the present invention. Components that are the same as those in FIG. 2 are denoted by the same reference numerals, and explanations of overlapping parts will be omitted.
As shown in FIG. 7, the electric motor 100A (100) includes a stator 1 having a core 10, a coil 13 and an insulating bobbin 12A, a rotor 2 having a permanent magnet 21, a ring core 11 which is a yoke part, and an insulating bobbin. 12A, and includes a teeth core 14 which is a teeth portion, and a gap 15 provided between the teeth core 14 and the ring core 11.

The insulating bobbin 12A includes an inner circumferential portion 121 extending in the circumferential direction between the permanent magnet 21 and the tooth core 14, an outer circumferential portion 122 extending in the circumferential direction between the teeth core 14 and the ring core 11, and an inner circumferential portion 121. It includes a wall portion 123 that connects the outer peripheral portion 122 in the radial direction, and a protrusion 124 that extends toward the gap 15 provided between the tee core 14 and the ring core 11.

A protrusion 124 extends toward the gap 15 between the ring core 11 and the tee core 14 on the insulating bobbin 12A. That is, the protrusion 124 of the insulating bobbin 12A extends so as to be inserted into the gap 15 from the left and right. The protrusion 124 functions as a spacer that maintains the radial thickness of the gap 15 at a predetermined thickness.
When the circumferential width of the tee score 14 is A and the circumferential width of the gap 15 is B, the relationship A>B holds true. The protrusion 124 allows the tee core 14 to be fixed to the insulating bobbin 12A while ensuring the gap 15 between the ring core 11 and the tee core 14. Furthermore, the radial width of the gap 15 can be arbitrarily set depending on the radial thickness of the protrusion 124.

FIG. 8 is a side view showing the configuration of the tooth core 14 and the insulating bobbin 12A of the electric motor 100A of FIG. 7, and shows the insulating bobbin 12A divided into two in the axial direction.
As shown in FIG. 8, the teeth core 14 can be housed in the insulation bobbin 12A by dividing the insulation bobbin 12A into two in the axial direction and covering the teeth core 14 from both sides in the axial direction.

As described above, according to the present embodiment, the insulating bobbin 12A of the electric motor 100A has the protrusion 124 extending toward the gap 15 provided between the tee core 14 and the ring core 11. Thereby, the teeth core 14 can be fixed to the insulating bobbin 12A, and the gap 15 between the teeth core 14 and the ring core 11 can be accurately and easily secured.

(Third embodiment)
FIG. 9 is a sectional view of an electric motor 100B according to a third embodiment of the present invention. Components that are the same as those in FIG. 2 are denoted by the same reference numerals, and explanations of overlapping parts will be omitted.
As shown in FIG. 9, the electric motor 100B (100) includes a stator 1 having a core 10, a coil 13, and an insulating bobbin 12B, a rotor 2 having a permanent magnet 21, a ring core 11 which is a yoke part, and an insulating bobbin. 12B and includes a tooth core 14B that is a tooth portion, and a gap 15 provided between the tooth core 14B and the ring core 11.

The tee core 14B has a wide surface facing the permanent magnet 21 on the inner peripheral side, and a narrow surface facing the ring core 11 on the outer peripheral side. In the tee score 14B, when the circumferential width on the inner circumferential side is C and the circumferential width on the outer circumferential side is D, the relationship C>D holds true.

The insulating bobbin 12B has an inner peripheral part 121 extending in the circumferential direction between the permanent magnet 21 and the tooth core 14, an outer peripheral part 122 extending in the circumferential direction between the teeth core 14 and the ring core 11, and an outer peripheral part 122 extending in the circumferential direction between the permanent magnet 21 and the tooth core 14. A wall portion 123B connects the inner peripheral portion 121 and the outer peripheral portion 122 while being inclined so that the opening becomes narrow.

In accordance with the shape of the teeth core 14B, the insulating bobbin 12B has wall portions 123B that are in contact with the teeth core 14B on both sides in the circumferential direction and are not parallel to each other, but are wider on the side facing the permanent magnet 21 and narrower on the side facing the ring core 11. There is. That is, the insulating bobbin 12B has a wide circumferential width on the inner circumferential side and a narrow circumferential width on the outer circumferential side.
The wall portion 123B that is inclined outwardly to become narrower allows the tooth core 14B to be firmly fixed to the insulating bobbin 12B while ensuring the gap 15 between the ring core 11 and the teeth core 14B.

FIG. 10 is a side view showing the configuration of the tooth core 14B and the insulating bobbin 12B of the electric motor 100B of FIG. 9, and shows the insulating bobbin 12B divided into two in the axial direction.
As shown in FIG. 10, by dividing the insulating bobbin 12B into two in the axial direction and covering the tee core 14B from both sides in the axial direction, the tee core 14B can be housed in the insulating bobbin 12B.

As described above, according to the present embodiment, in the electric motor 100B, the tooth core 14 has a wide surface facing the permanent magnet 21 and a narrow surface facing the ring core 11, and the insulating bobbin 12 has a wide surface facing the permanent magnet 21 and a narrow surface facing the ring core 11. 14, the wall portions 123B that contact the tee core 14 on both sides in the circumferential direction are not parallel to each other, and are wider on the side facing the permanent magnet 21 and narrower on the side facing the ring core 11. Thereby, the teeth core 14B can be firmly fixed to the insulating bobbin 12B while easily securing the gap 15 between the teeth core 14B and the ring core 11.

(Fourth embodiment)
FIG. 11 is a sectional view of an electric motor 100C according to a fourth embodiment of the present invention. Components that are the same as those in FIG. 2 are denoted by the same reference numerals, and explanations of overlapping parts will be omitted.
As shown in FIG. 11, the electric motor 100C (100) includes a stator 1 having a core 10, a coil 13, and an insulating bobbin 12C, a rotor 2 having a permanent magnet 21, a ring core 11 which is a yoke part, and an insulating bobbin. 12C and includes a teeth core 14 which is a teeth portion, a gap 15 provided between the teeth core 14 and the ring core 11, and an adhesive 151 filled in the gap 15.

The insulating bobbin 12C has an inner circumferential side (inner circumferential portion 121) which is not an annular ring but is made up of three members divided into three parts.
Gap 15 between tee core 14 and ring core 11 is filled with adhesive 151.
By fixing the tee core 14 and the ring core 11 with the adhesive 151, there is no need to receive the inner peripheral side of the tee core 14 with the insulating bobbin 12C. Therefore, the air gap between the tooth core 14 and the permanent magnet 21 can be narrowed, and the torque of the electric motor can be improved.

As described above, according to the present embodiment, the electric motor 100C includes the insulating bobbin 12C, which is made up of three members whose inner circumferential side (inner circumferential portion 121) is divided into three parts, and the tee core 14 and the ring core 11. The gap 15 in between is filled with adhesive 151. Since the insulating bobbin 12C is composed of three members whose inner circumferential side is divided into three parts, it is no longer necessary to receive the inner circumferential side of the tee core 14 with the inner circumferential part 121 (the tee core 14 can be enlarged in the radial direction), and the tee core 14 can be enlarged in the radial direction. The air gap between the score 14 and the permanent magnet 21 can be further narrowed. Thereby, it is possible to provide the electric motor 100C with improved torque.

(Fifth embodiment)
FIG. 12 is a sectional view of an electric motor 100D according to a fifth embodiment of the present invention. Components that are the same as those in FIG. 11 are denoted by the same reference numerals, and explanations of overlapping parts will be omitted.
As shown in FIG. 12, the electric motor 100D (100) includes insulating bobbins 12D1 and 12D2 (12D) obtained by further dividing the insulating bobbin 12C shown in FIG. and a holding member 16.

The electric motor 100D (100) has a configuration in which the insulating bobbins 12D1 and 12D2 (12D) are individually separated, so that after winding the coil 13 around each insulating bobbin 12D with a high space factor, the inner peripheral side of the ring core 11 It can be paid to.

As described above, according to the present embodiment, the electric motor 100D is configured such that the insulating bobbin 12D is separated for each tooth core 14, and the cylindrical holding member 161 is provided between the insulating bobbin 12D and the permanent magnet 21. It is located. Thereby, it is possible to provide the electric motor 100D in which the coil 13 is wound with a high space factor.

Further, in this embodiment, the holding member 16 is provided with a convex portion 161 that protrudes in the radial direction at a portion facing the tee core 14. By doing so, the circumferential position of the insulating bobbin 12D can be accurately secured by the convex portion 161, and the tee core 14 can be stably fixed.

(Sixth embodiment)
An electric blower which is an example to which the electric motor of the present invention is applied will be explained.
FIG. 13 is a sectional view of an electric blower 200 including an electric motor 100 according to a sixth embodiment of the present invention.
As shown in FIG. 13, the electric blower 200 is a blower including a mixed flow impeller 40 (impeller), a fan cover 41, and a flow path 42, and includes an electric motor 100.

As the electric motor 100, any of the electric motors 100, 100A to 100D of each embodiment may be applied.
The electric motor 100 is housed in a motor housing 30, and the insulating bobbin 12 is fixed to a coil holding part 32 provided on an end bracket 31. The rotor 2 is rotatably fixed to the motor housing 30 via a bearing 33.
A mixed flow impeller 40 is provided at the end of the shaft 22, and together with a fan cover 41 constitutes an electric blower 200. Further, a cylindrical flow path 42 is provided between the outer periphery of the motor housing 30 and the fan cover 41.

The operation of the electric blower 200 configured as described above will be described below.
A DC magnetic field is formed on the outer circumferential side of the rotor 2 by permanent magnets 21 . On the other hand, when three-phase power converted to a predetermined frequency by an inverter (not shown) is fed to the coil 13, a rotating magnetic field is formed on the inner peripheral side of the stator 1.
By applying a current matched to the magnetic pole position of the rotor 2, torque is generated due to attraction and repulsion between the rotating magnetic field and the DC magnetic field, and the rotor 2 rotates around the axis O.
As a result, the mixed flow impeller 40 rotates as shown by the thin arrow in FIG. (see thick arrow). The airflow F formed by the mixed flow impeller 40 consists of a straight component moving toward the right and a swirling component in the same direction as the rotation of the shaft.

As described above, according to the present embodiment, the electric blower 200 using the electric motor 100 of the present invention can provide a small, lightweight, highly efficient, and low-noise electric blower.

(Seventh embodiment)
A vacuum cleaner 400, which is an example to which the electric motor of the present invention is applied, will be described.
14 to 16 are configuration diagrams of a vacuum cleaner 400 including a motor 100 according to a seventh embodiment of the present invention. FIG. 14 is a perspective view when the vacuum cleaner 400 is used as a stick type, FIG. 15 is a side view when the vacuum cleaner 400 is used as a handheld type, and FIG. 16 is a longitudinal section of the main body of the vacuum cleaner 400. It is a diagram.
In addition, although the case where it is applied to the rechargeable vacuum cleaner 400 that can be used by switching between a stick type and a handy type as appropriate will be explained below, it can also be applied to various types such as only a stick type, only a handy type, etc. Can be applied to vacuum cleaners.

As shown in FIGS. 14 to 16, the vacuum cleaner 400 includes a dust collection chamber 401 that collects dust and an electric blower 200 (see FIG. 16) that generates a suction airflow necessary for collecting dust.
The vacuum cleaner 400 includes a vacuum cleaner main body 410 that houses the electric blower 200, a telescopic pipe 402 that is extendable and retractable with respect to the vacuum cleaner main body 410, a grip portion 403 provided at one end of the telescopic pipe 402, and a grip portion. It is configured to include a switch section 404 that turns on and off the electric blower 200 provided at 403 .

The vacuum cleaner 400 shown in FIG. 14 is in a stick state, and the telescopic pipe 402 is in an extended state. 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 by a connecting portion 406.

The vacuum cleaner 400 shown in FIG. 15 is in a handy state, with the telescopic pipe 402 being housed in the vacuum cleaner body 410 and the grip portion 403 being close to the telescopic pipe 402 side. Further, a handy grip portion 407 that serves as a handle in a handy state is provided on the upper surface side of the cleaner main body 410 between the grip portion 403 and the dust collection chamber 401 which are brought close to each other. Further, 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 connecting portion 406.

In the above configuration, in the vacuum cleaner 400, by operating the switch section 404 of the grip section 403, the electric blower 200 (see FIG. 16) housed in the vacuum cleaner main body 410 is operated to generate a suction airflow. Then, dust is sucked in from the suction bodies 405 and 408 and collected into the dust collection chamber 401 of the cleaner main body 410 through the connection part 406.

FIG. 16 is a longitudinal sectional view of the vacuum cleaner 400 main body. Note that FIG. 16 shows a handy state, with the suction body 408 removed from the vacuum cleaner main body 410.
As shown in FIG. 16, inside the vacuum cleaner body 410, an electric blower 200 that generates suction force (see FIG. 13), a battery unit 420 that supplies power to the electric blower 200, and a driving circuit 430 are provided. There is.

The air sucked in from the suction bodies 405 and 408 (see FIGS. 14 and 15) passes through a flow path 440 (see FIG. 14) provided in the vacuum cleaner body 410 to a dust collector disposed in front of the electric blower 200. The dust is sent to the chamber 401 and collected therein. After the dust has been separated in the dust collection chamber 401, the air 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.

As described above, according to the present embodiment, the vacuum cleaner 400 includes the electric blower 200 using the electric motor 100 of the present invention. As a result, it is possible to provide a vacuum cleaner that is small, lightweight, highly efficient, and has low noise.

[Modified example]
In each embodiment, in the electric motor 100, the permanent magnet 21 has four poles, and the magnetization distribution is polar anisotropic or Halbach array, but other pole numbers such as two poles or six poles may be used. The magnetization distribution may also be parallel magnetization or radial magnetization.
The material of the permanent magnet 21 is assumed to be a rare earth bonded magnet made by mixing rare earth magnetic powder such as a samarium iron nitrogen magnet or a neodymium magnet with an organic binder, but rare earth sintered magnets or ferrite may also be used. Other permanent magnets may also be used, such as magnets. Alternatively, a reluctance motor or the like that does not use a permanent magnet may be used.
Further, the number of coils is not limited to three, and may be any other number that is a multiple of three, such as six or nine.

In each embodiment, the electric motor 100 has an inner rotor structure with the rotor 2 on the inner circumference side and the stator 1 on the outer circumference side, but an outer rotor structure with the rotor 2 on the outer circumference side and the stator 1 on the inner circumference side. It may also be a structure.

The above-described embodiments have been described in detail to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the configurations described. Furthermore, it is possible to replace a part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. Further, it is possible to add, delete, or replace a part of the configuration of each embodiment with other configurations.

1 Stator 2 Rotor 10 Core 11 Ring core 12, 12A, 12C, 12D, 12D1, 12D2 Insulating bobbin 13 Coil 14, 14B Tee core 15 Gap (void)
16 Holding member 21 Permanent magnet 32 Coil holding part 40 Diagonal flow impeller (impeller)
41 Fan cover 42 Channel 100, 100A to 100D Electric motor 121 Inner periphery 122 Outer periphery 123, 123B Wall 124 Projection 151 Adhesive 161 Projection 200 Electric blower (blower)
400 Vacuum cleaner 401 Dust collection chamber 410 Vacuum cleaner body

Claims (8)

A stator having a core, a coil, and an insulating bobbin, and a rotor having a permanent magnet,
The core is divided into a ring core, which is a yoke part, and a teeth core, which is a teeth part,
The electric motor is characterized in that the teeth core is fixed to the insulating bobbin, and a gap is provided between the teeth core and the ring core. The insulating bobbin includes an inner peripheral portion extending in a circumferential direction between the permanent magnet and the tee core;
an outer peripheral portion extending in the circumferential direction between the tee core and the ring core;
The electric motor according to claim 1, further comprising a wall portion connecting the inner peripheral portion and the outer peripheral portion in a radial direction. The electric motor according to claim 1, wherein the insulating bobbin has a protrusion extending toward the gap provided between the tee core and the ring core. The tee core has a wide surface facing the permanent magnet and a narrow surface facing the ring core,
The insulating bobbin is characterized in that, in accordance with the shape of the teeth core, the wall portions that contact the teeth core on both sides in the circumferential direction are wide on the side facing the permanent magnet and narrow on the side facing the ring core. The electric motor according to claim 2. The electric motor according to claim 1, wherein the gap between the tee core and the ring core is filled with an adhesive. The insulating bobbin is configured separately for each of the tee cores,
The electric motor according to claim 1, wherein a cylindrical holding member for holding the insulating bobbin is disposed between the insulating bobbin and the permanent magnet. An electric blower comprising an electric motor that drives a blower having an impeller, a fan cover, and a flow path,
An electric blower, wherein the electric motor is the electric motor according to any one of claims 1 to 6. A vacuum cleaner comprising a dust collection chamber and an electric blower that generates the suction airflow necessary for dust collection,
A vacuum cleaner, wherein the electric blower includes the electric blower according to claim 7.

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