TWI506923B - Electric blowers and electric vacuum cleaners - Google Patents

Description

Electric blower and electric vacuum cleaner

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

An electric blower that is integrated into a blower and a motor of an electric vacuum cleaner generally uses a high number of revolutions of 30,000 to 45,000 r/min. Therefore, in the electric blower, a stator having a magnetic field coil having two magnetic poles and a commutator motor including a rotor having a motor sub-coil and a commutator inside the stator are used.

In the conventional electric blower, the magnetic pole protrudes inward from a yoke whose shape is slightly square, and the magnetic pole angle (the angle formed by the two straight lines connecting the ends of the arc of the magnetic pole tip and the center of the shaft) is 120. Degree ~ 140 degrees. The magnetic field coil is wound around the magnetic pole, and if the coil end between the left and right sides of the magnetic pole is connected by a straight line of the shortest path, the rotor is disturbed, so that it is bent on the outer diameter side. Bypass. Further, the side surfaces on the right and left sides of the magnetic poles of the magnetic field coil are not parallel but are inclined on the inner diameter side, and have a shape in which the yoke is surrounded by the outer side. Therefore, when the coil is wound around the magnetic pole, a wire is slid in from the opening between the tip end of the magnetic pole and the yoke, and is wound around the root of the magnetic pole by the tension of the strand. As a result, the arrangement of the coils is determined by the process, and it is difficult to arrange the coils (the coils are regularly aligned and high-density side by side), and the coil occupation ratio (the actual packaged winding line, the space occupied by the occupant configuration winding line) The ratio is low, and since the winding wire is often long, the efficiency and weight reduction of the electric blower are hindered.

For example, in Patent Document 1 to be described later, a technique in which a split core that is divided at a root portion of a magnetic pole is a stator core and a pre-roll is placed outside the stator core. A coil (a component state) which is formed or wound in a high density by a bobbin is mounted on the divided individual magnetic poles, thereby increasing the coil occupation ratio.

Advanced technical literature Patent literature

Patent Document 1: Japanese Laid-Open Patent Publication No. 2010-200467

However, according to the above-described past technique, the magnetic field coil is wound around the magnetic pole having a large magnetic pole angle, and it is necessary to bend the end portion of the coil between the left and right sides of the magnetic pole on the outer diameter side. In order to achieve the bending of the coil end portion and the alignment of the coils, it is necessary to perform the entire array of coils without bending the coil ends, and then separately deform the coil ends into a curved shape. Therefore, there is a case where the arrangement of the coil is broken when the end portion of the coil is deformed, or the insulating film is damaged. Further, after the deformation, it is necessary to use a varnish or a self-melting line (the surface is previously coated with heat and melt). The resin strands and the like are used to fix the coils, and thus productivity and economy are remarkably lowered. Moreover, since the core division position is the root of the magnetic pole, all the magnetic flux lines cross the division plane, so that the core division further leads to inefficiency.

In addition, in the electric blower for electric vacuum cleaners for household use, the inner diameter of the axial height of the stator core is shorter by 1/3 to 1/2, and the length of the end of the coil has a great influence on the efficiency of the electric blower. . Therefore, from the viewpoint of improving the efficiency of the electric blower, it is preferable to avoid bending the coil end portion on the outer diameter side.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to provide an electric blower which can easily achieve an entire row of coils of a field coil, and can improve efficiency and reduce weight.

In order to solve the above problems and achieve the object, the electric blower of the present invention is composed of a stator having a stator core and a field coil, and a rotor disposed inside the stator; wherein the stator core is in the direction of rotation of the magnetic pole center line The two core split positions of the rear side are divided into a first stator core and a second stator core of two C-shaped portions; the first stator core and the second stator core are perpendicular to the magnetic pole center line The position of the outermost core portion is three straight portions and is bulged outward in a U shape, and the U-shaped shape bulging outward is used in the same manner as the outer circumference of the rotor. a region, and a second region sandwiching a core portion of the straight portion of the central portion of the three straight portions and symmetrical with the first region, as a region in which the magnetic field coil is wound, and with the rotor pair The width in the radial direction of the portion is smaller as it is closer to the core division position.

According to the electric blower of the present invention, the entire coil of the field coil is easily achieved, and the efficiency and the weight reduction can be improved.

1‧‧‧Electric blower

2‧‧‧Air Supply Department

3‧‧‧ commutator motor

4‧‧‧Fan

5‧‧‧Fan Guide

6‧‧‧Shell

7‧‧‧ Stator

8‧‧‧Rotor

9‧‧‧ Stator core

9A‧‧‧C shape department

9Aa‧‧‧Left end

9Ab‧‧‧Shoulder

9Ac‧‧‧ wrist

9Ad‧‧‧Shoulder

9Ae‧‧‧Right end

9B‧‧‧C shape section

9Ba‧‧‧Left end

9Bb‧‧‧Shoulder

9Bc‧‧‧ wrist

9Bd‧‧‧Shoulder

9Be‧‧‧Right end

10‧‧‧ magnetic field coil

11‧‧‧Axis

12‧‧‧Rotor core

13‧‧ ‧ commutator

14‧‧‧ bearing

15‧‧‧ bearing

16‧‧‧ shaft end

17‧‧‧Motor sub-coil

18‧‧‧frag

19‧‧‧

20‧‧‧ gap

21‧‧‧ bracket

23‧‧‧Wedges

24‧‧‧Insulating materials

24a, 24b‧‧‧ wall

25a, 25b‧‧‧core division position

26a, 26b‧‧‧ magnetic pole

27‧‧‧Iron fixed fixture

28‧‧‧spindle arm

29‧‧‧Nozzles

30, 32‧‧‧ space

31, 33‧‧‧ space

34‧‧‧Line material

34a‧‧‧Introduction line

35‧‧‧Magnetic center line

36‧‧‧Rotation direction

37‧‧‧Rotate

38‧‧‧ moving back and forth

41‧‧‧ vacuum cleaner body

42‧‧‧Inhalation

43‧‧‧Dust collection department

44‧‧‧Export

Fig. 1 is a longitudinal sectional view showing a schematic structure of the inside of an electric blower.

Fig. 2 is a view showing a main portion of the commutator motor viewed from the axial direction of the air blowing portion side.

Fig. 3 is a view showing the shape of the stator core of the first embodiment.

Figure 4 is a diagram showing the state of the entire column of coils.

Fig. 5 is a view showing a state of a whole-row coil by a flyer winding machine.

Fig. 6 is a view showing the shape of a stator core in the second embodiment.

Fig. 7 is a view showing the shape of a stator core in the second embodiment.

Fig. 8 is an example of a magnetic flux diagram when the stator core of Fig. 7 is obtained by electro-magnetic analysis.

Fig. 9 is an example of a case where the corners of one of the spaces 30 and 32 are 120 degrees.

Figure 10 is a cross-sectional view of an electric vacuum cleaner having an electric blower.

Fig. 11 is a view showing the shape of a stator core of the sixth embodiment.

Fig. 12 is a view showing the shape of the stator core of the sixth embodiment.

Fig. 13 is a view showing the shape of the stator core of the seventh embodiment.

Fig. 14 is a view showing the shape of the stator core of the seventh embodiment.

Hereinafter, embodiments of the electric blower of the present invention will be described in detail using the drawings. Further, the present invention is not limited to the embodiment.

Embodiment 1

(constitution)

Fig. 1 is a longitudinal sectional view showing a schematic structure of the inside of an electric blower. The electric blower 1 is basically composed of two units, that is, a blower 2 that generates a suction force and a commutator motor 3 that drives the blower unit 2. The electric blower 1 can be applied to, for example, an electric vacuum cleaner.

The blower unit 2 includes a fan 4 having a plurality of fins, and a fan guide 5 that covers the fan 4 and introduces the air that has flowed into the commutator motor 3 in accordance with the rotation of the fan 4. The air that has passed through cools the commutator motor 3 that generates heat as it is operated, and is discharged from an opening (not shown) provided in the casing 6.

The commutator motor 3 includes a stator 7 as a field magnet fixed inside a cup-shaped casing 6, and is disposed oppositely through the gap 20 inside the stator 7, and is rotatably supported It serves as the rotor 8 of the motor. Further, there is no portion that is received inside the casing 6, and the casing 6 is provided with an opening, a notch, or the like (not shown) and protrudes to the outside.

The stator 7 includes a stator core 9 which is fixed by lamination of a plurality of electromagnetic steel sheets, and a field coil 10 which is wound around the stator core 9 by an insulating member. In the stator 7, a magnetic field is generated inside the stator 7 by flowing a current through the field coil 10.

The rotor 8 includes a shaft 11 disposed at a center, a ring-shaped rotor core 12 fixed by laminating a plurality of electromagnetic steel sheets fixed around the shaft 11, and wound around the rotor core by an insulating member. The motor sub-coil 17 on the 12 and the commutator 13 disposed around the rotor 11 are disposed apart from the rotor core 12. The rotor 8 is rotatably supported by the housing 6 by a shaft 11, a bearing 14, and a bearing 15.

The bearing 14 on the side of the air blowing unit 2 is housed in a bracket 21 that is provided in a bridging shape across the opening of the casing 6. Further, the bearing 15 on the other side (the side opposite to the side of the air blowing portion 2) is housed in the bottom of the casing 6.

The fan 4 is fixed to the shaft end portion 16 on the side of the air blowing portion 2 of the shaft 11, and the fan 4 is driven to rotate in accordance with the rotation of the rotor 8. The start end (one end of the start of the roll) and the end (the end of the roll) of the plurality of coils constituting the motor sub-coil 17 are electrically connected to the segment 18 of the commutator 13 by a method such as fusing or the like. . It is held in the casing 6, and a pair of brush bodies 19 which are pressed and contacted to the commutator 13 by a spring are connected to a power source (not shown), and are passed through the commutator 13 to supply a current (motor sub-current) to the motor sub-coil. 17.

Torque is generated in the rotor 8 by the magnetic field generated by the stator 7 and the motor sub-current. In the rotor 8, since the direction of rotation is constant, the coil through which the motor subcurrent flows is coupled to the motor sub-coil 17 and the segment 18 in a switching manner in accordance with the phase of the rotor 8.

Fig. 2 is a view showing a main portion of the commutator motor 3 viewed from the axial direction of the air blowing portion 2. However, the casing 6 and the rotor 8 are cross-sectional views, and the right half of the field coil 10 is a view seen from the axial direction and the left half is a cross-sectional view. In addition, Fig. 3 is a view showing the shape of the stator core 9 of the present embodiment, in which the stator core 9 is picked up from Fig. 2 . The rotor 8 has a shaft 11 at its center, and the motor sub-coil 17 is wound around the rotor core 12 by an insulating member 22, and is blocked by a wedge 23. The rotation direction 36 of the rotor 8 is determined by the direction of the fin of the blower unit 2, and is left-handed (counterclockwise) in the drawing viewed from the axial direction of the blower unit 2 side. The stator core 9 is divided into two C-shaped portions 9A and 9B at the two core division positions 25a and 25b (that is, the first stator core and the second stator core). C-shaped portion 9A The left end portion 9Aa and the right end portion 9Be of the C-shaped portion 9B, and the right end portion 9Ae of the C-shaped portion 9A and the left end portion 9Ba of the C-shaped portion 9B constitute one magnetic pole 26a, 26b, respectively. Inside the magnetic poles 26a and 26b, the rotor 8 is disposed to face each other with a predetermined gap 20.

The two core division positions 25a and 25b are located at symmetrical positions with respect to the rotor 8, and are located at positions shifted from the magnetic pole center line 35 toward the rear side in the rotation direction of the rotor 8. Specifically, next to the electrically neutral axis. The magnetic flux generated by the magnetic field coil 10 is along the direction of the magnetic pole center line 35 between the magnetic poles 26a, 26b, but because of the magnetic flux synthesis generated by the motor sub-coil 17, the electrically neutral axis is rotated from the magnetic pole center line 35. The back side offset. Therefore, the angle at which the two core division positions 25a and 25b are offset from the magnetic pole center line 35 is set in accordance with the balance condition of the magnetic fluxes generated by the field coil 10 and the motor sub-coil 17, respectively.

Among the two C-shaped portions 9A and 9B, the cross-sectional shape (in the axial direction) perpendicular to the axis of the rotor 8 is slightly symmetrical with respect to the center of the rotor 8. Among the two C-shaped portions 9A and 9B, the central portion at a position slightly perpendicular to the magnetic pole center line 35 is a shoulder portion 9Ab, a wrist portion 9Ac, a shoulder portion 9Ad, a shoulder portion 9Bb, and a wrist portion 9Bc. Each of the three straight portions of the shoulder portion 9Bd is formed in a U shape, and is bulged outward from both ends of the magnetic poles 26a and 26b, and a space 30 and 32 (first region) having a substantially square shape is formed between the outer circumference of the rotor 8. The magnetic field coils 10 are at the wrist portions 9Ac and the wrist portions 9Bc in the slightly square-shaped spaces 30 and 32, and the wrist portions 9Ac and the wrist portions 9Bc sandwiching the central straight portion and the symmetrical spaces 31 and 33 (the second region). The surrounding package is a toroidal roll. The direction of the current flowing to the left and right magnetic field coils 10 is sandwiched by the magnetic pole center line 35, and is viewed from the axial direction of the rotor 8, and is connected to the magnetic pole center line 35 in an asymmetrical flow direction. In Figure 2, the circle There is a point in the circle and a cross-hatched (x-mark) mark in the circle indicates the direction of the volume. Further, the direction of the current flowing to the field coil 10 is not limited to the direction of the second drawing, and may be a combination of the opposite directions.

(effect)

In the electric blower 1, the stator core 9 of the commutator motor 3 is configured as described above, whereby interference with the rotor 8 can be avoided, and therefore it is not necessary to bend the coil end portion of the field coil 10. Further, the wrist portion 9Ac and the arm portion 9Bc which are the surfaces of the first layer in which the field coil 10 is provided are linear, and the left and right spaces of the field coil 10 are open, whereby it is easy to control the position where the strands are placed, and it is easy to arrange the entire column. Coil. In addition, the useless space that does not contribute to the performance of the motor is reduced, and the magnetic path length is shortened. The above reasons are explained in more detail below.

In general, when the wire material having a circular cross section generally used is disposed at a high density, as shown in the cross-sectional view of Fig. 4, the first layer is arranged at intervals of the wire diameter d with almost no gap. Figure 4 is a diagram showing the state of the entire column of coils. In addition, in order to simplify the description, the number of rolls and the arrangement shown in FIG. 4 are different from the number of rolls and the arrangement shown in FIG. In the entire column of coils, when the configuration of each layer is finished and moved to the upper layer, it must be controlled to intersect with the strand before the turn and change the direction of the strand by the wall faces 24a, 24b of the insulating member 24. This makes it easy to control the strands. Specifically, it is the direction of the strand of the last turn of the first layer shown in Fig. 4 and the direction of the strand when moving to the second layer. After the second layer, the strands are placed along the recesses between the strands of the lower layer, thereby preventing positional deviation, and the entire array of coils (so-called "straw pack accumulation") can be easily achieved. Therefore, the surface placed on the first layer is linear along the direction in which the strands are arranged, and is suitable for forming an entire row of coils.

The automaton that performs the winding is used, for example, as shown in the schematic diagram of Fig. 5, using a flyer winding machine. Figure 5 shows a diagram of the appearance of the entire array of coils by a flyer. In the spindle winding machine, the C-shaped portion 9A or 9B is fixed by the core fixing jig 27 so that the flyer arm 28 of the nozzle 29 of the guide wire 34 is provided at the tip end at the wrist 9Ac or the wrist. The periphery of the portion 9Bc is rotated to perform winding. In Fig. 5, the control of the position of the wire 34 is performed by synchronously controlling the rotation 37 of the flyer arm 28 and the forward and backward movement 38. The introduction line 34a is an introduction portion when the strand 34 is wound around the C-shaped portion 9A or 9B by a spindle winding machine. However, the wire 34 is usually adopted The copper wire or the aluminum wire of 2 or less is low in rigidity, and since the old state of bending remains after the deformation process before the nozzle 29 is inserted, the wire 34 from the outlet of the nozzle 29 is not straight, and the line is placed. The position of the material 34 is offset by the target position such that the entire array of coils is lost. In order to reduce this phenomenon, it is preferable that the nozzle 29 is close to the surface on which the strand 34 is placed. Therefore, the left and right spaces of the field coil 10 are open to allow the nozzles 29 to be close to each other, and are suitable for the entire array of coils. Further, in the case of a spindle winding method in which the nozzle 29 is fixed and the C-shaped portion 9A or 9B is rotated.

Further, the core division positions 25a and 25b have a low magnetic flux density in the vicinity of the electrical neutral axis, and the number of magnetic flux lines crossing the core division surface is small, thereby suppressing the inefficiency due to the core division.

Further, it is not necessary to bend the coil end portion of the field coil 10, and the surface on which the first layer is placed is linear, and other methods of easily forming the entire row of coils are not wound around the wrist portion 9Ac and the wrist portion 9Bc, but are wound around The circumference of the shoulders 9Ab, 9Ad, and 9Bb, 9Bd is a toroidal roll. However, in this case, it is necessary to have a space through which the nozzle 29 passes in the spaces 30, 32, which cannot be matched in this portion. Since the coil is placed, it is not suitable for downsizing and weight reduction of the stator core 9.

(effect)

As described above, according to the present embodiment, it is not necessary to bend the coil end portion of the field coil 10 in order to avoid interference with the rotor 8, and to arrange the surface of the first layer of the field coil 10 (the wrist portion 9Ac and the wrist portion 9Bc). In the form of a straight line, the left and right spaces of the field coil 10 are open, thereby making it easy to control the position at which the strands are placed, and it is easy to arrange the coils. In addition, the useless space that does not contribute to the performance of the motor is reduced, and the magnetic path length is shortened. Further, by making the magnetic flux density of the core division positions 25a and 25b low, it is possible to suppress the inefficiency due to the core division. With these features, the efficiency and weight reduction of the electric blower 1 can be achieved.

Embodiment 2

In the present embodiment, the two C-shaped portions 9A and 9B constituting the stator core 9 will be described as different from the first embodiment.

(constitution)

In the electric blower 1, the left end portion 9Aa, the right end portion 9Be, the right end portion 9Ae, and the left end portion 9Ba of the two C-shaped portions 9A and 9B facing each other in the radial direction (magnetic path width) are respectively The position near the core division positions 25a, 25b is reduced. Applicable examples are shown in Figures 6 and 7. Figs. 6 and 7 are views showing the stator core 9 viewed from the axial direction as in the third embodiment, and are views showing the shape of the stator core 9 of the present embodiment. In Fig. 6, the abutting faces of the C-shaped portion 9A and the C-shaped portion 9B having a small width are provided in the core dividing positions 25a and 25b. In addition, in FIG. 7, the shape of FIG. 6 is almost the same, but a minute gap is provided in the core division positions 25a and 25b, and the C-shaped portion 9A and the C-shaped portion 9B are separated, and Each tip end portion has an R-shaped spherical shape.

(effect)

In the electric blower 1, the C-shaped portion 9A and the C-shaped portion 9B are configured as described above, and the efficiency can be suppressed and the weight can be reduced. The above reasons are explained in more detail below.

Fig. 8 is a view showing an example of a magnetic flux diagram when the stator core 9 of Fig. 7 is obtained by electro-magnetic analysis. Further, the magnetic flux diagram when the stator core 9 of Fig. 6 is used is also the same as that of Fig. 8. In other words, since the magnetic flux density in the vicinity of the core division positions 25a and 25b is low, the degree of freedom of shape is high and can be designed into a desired shape. The electrically neutral axis is almost a straight line connecting the core division position 25a and the core division position 25b. Therefore, the magnetic flux line has two parts: 9Aa, 9Ab, 9Ac, and 9Ad which sequentially connect the rotor core 12 and the C-shaped portion 9A. 9Ae, a loop on the left side of the rotor core 12, and 9Be, 9Bd, 9Bc, 9Bb, and 9Ba of the rotor core 12 and the C-shaped portion 9B, and a loop on the right side of the rotor core 12 in this order.

The magnetic flux line passing through the core division position 25a passes through the (outer ring) position close to the core division position 25b, and passes through the (inner ring) position away from the core division position 25b by the magnetic flux line far from the core division position 25a. In other words, in the left end portion 9Aa, the right end portion 9Be, and the right end portion 9Ae and the left end portion 9Ba, the number of magnetic flux lines closer to the core division position 25a and the core division position 25b is smaller, and the distance from the core division position 25a and the core is further. The number of the magnetic flux lines at the division position 25b is larger. Therefore, even if the magnetic path width closer to the core division position 25a and the core division position 25b is smaller, the magnetic flux density is not saturated, and the efficiency can be suppressed, and the weight reduction corresponding to the reduction of the magnetic path width can be achieved.

(effect)

As described above, according to the present embodiment, in the two C-shaped portions 9A and the C-shaped portion 9B, the width in the radial direction of the portion facing the rotor 8 is closer to the core division position 25a and the core division position 25b. The smaller it is. Thereby, it is possible to suppress the inefficiency and further reduce the weight.

Embodiment 3

In the present embodiment, the method of winding the magnetic field coil 10 will be described with respect to the portions of the first and second embodiments.

(constitution)

In the electric blower 1, in the spaces 30 and 32 on the inner side of the stator core 9, the field coil 10 is placed in a straw-packed shape, and a cross point at which the upper and lower layers are intersected with each other is disposed in the space 30. Further, 32 (the spaces 31 and 33 on the outer side of the stator core 9 or the coil ends on the upper side and the lower side in the axial direction) are more preferable.

(effect)

By forming the winding state of the field coil 10 as described above, it is possible to reduce the outer shape of the stator core 9 (specifically, the lengths of the shoulder portions 9Ab, 9Ad, 9Bb, and 9Bd), and it is possible to achieve efficiency improvement and weight reduction. The above reasons are explained in more detail below.

The cross-sectional area of the spaces 30, 32 is roughly the product of the length of the wrist (9Ac, 9Bc) and the length of the shoulders (9Ab, 9Ad, 9Bb, 9Bd). The length of the wrist portions (9Ac, 9Bc) is determined by the outer diameter of the rotor 8 and the magnetic pole angle. Therefore, shortening the length of the shoulder portions (9Ab, 9Ad, 9Bb, and 9Bd) can be used as a means for improving efficiency and weight. The necessary cross-sectional area of the spaces 30 and 32 is a result obtained by dividing the cross-sectional area of the field coil 10 by the coil occupation ratio of the spaces 30 and 32. By increasing the coil occupying ratio of the spaces 30 and 32, the length of the shoulder portions (9Ab, 9Ad, 9Bb, 9Bd) can be shortened. Therefore, the magnetic field coil 10 may be disposed in the space 30 and 32 in a straw packing shape. However, in the cross section of the intersection where the strands of the upper and lower layers intersect each other, the coil occupancy rate is lower than the position where the straw bales are stacked, but it is necessary to set the intersection point in at least one of the following four points: the stator Spaces 30 and 32 on the inner side of the core 9; spaces 31 and 33 on the outer side of the stator core 9; coil end portions on the upper side in the axial direction; and coil end portions on the lower side in the axial direction. Therefore, in the side having the intersection, since the coil region in the layer direction is enlarged, the intersections can be arranged in the spaces 31 and 33 outside the stator core 9 and the coil ends on the upper side and the lower side in the axial direction.

(effect)

As described above, according to the present embodiment, the intersection points are arranged in a space other than the spaces 30 and 32 inside the stator core 9 at the time of arranging the coils. Thereby, the outer shape of the stator core 9 can be reduced, and efficiency can be improved and weight reduction can be achieved.

Embodiment 4

Further, in the first to third embodiments, the angles of the two corners on the outer sides of the slightly square-shaped spaces 30 and 32 are described as being slightly 90 degrees, but the present invention is not limited thereto. For example, it may be 120 degrees on one side or both sides. In this case, as in the case where the corner angle is about 90 degrees, the field coil 10 is easily arranged in a straw pack. Fig. 9 is an example of a case where the corners of one of the spaces 30 and 32 are 120 degrees. In this case, there is also a one-sided corner angle of about 120 degrees in the spaces 31, 33. As described above, when the corner angle of one side is about 120 degrees, it is also possible to easily arrange the straw pack when the coil is aligned.

Embodiment 5

Here, the case where the electric blower 1 described in the first to fourth embodiments is actually used in the product will be described. Figure 10 is a cross-sectional view of an electric vacuum cleaner having an electric blower. The electric vacuum cleaner includes a suction port 42 that sucks outside air into the cleaner body 41, a dust collecting portion 43 that collects dust in the sucked outside air, and a discharge port 44 that discharges the sucked outside air, and generates external air from the suction. The air blower 1 that sucks the air flow discharged from the discharge port 44 and the air blown from the suction port 42 passes through the dust collecting portion 43, the electric blower 1, and the discharge port 44, and is discharged to the outside of the cleaner body 41. As described above, by mounting the electric blower 1 in the electric vacuum cleaner, the electric vacuum cleaner can also achieve efficiency improvement and weight reduction. Further, the case where the electric blower is used for the electric vacuum cleaner is described as an example, but the present invention is not limited thereto, and the electric blower 1 may be attached to another product.

Embodiment 6

(constitution)

In the stator core 9 shown in FIGS. 6 to 8 of the second embodiment, it is preferable that the left end portion 9Aa, the right end portion 9Be, and the right end portion 9Ae of the two C-shaped portions 9A and 9B facing the rotor 8 are The left end portion 9Ba expands and abuts the width in the radial direction of the tip end portion thereof. An example of application is shown in Fig. 11, and a state in which the abutting portion of Fig. 11 is enlarged is shown in Fig. 12. 11 and FIG. 12 and FIG. 6 are views showing the stator core 9 viewed from the axial direction, and are views showing the shape of the stator core 9 of the present embodiment. The broken line shown in Figs. 11 and 12 indicates the outline in the case where the width of the tip end portion in the radial direction is not enlarged. The case of the non-expansion is the same as the sixth figure of the second embodiment. In the C-shaped portion 9A, the portion that has been enlarged on the right end portion 9Ae side is the right enlarged portion 9Af, and the left end The enlarged portion of the portion 9Aa side serves as the left enlarged portion 9Ag. Similarly, in the C-shaped portion 9B, the enlarged portion on the right end portion 9Be side serves as the right enlarged portion 9Bf, and the enlarged portion on the left end portion 9Ba side serves as the left enlarged portion 9Bg. Hereinafter, the right enlarged portion 9Af, the left enlarged portion 9Ag, the right enlarged portion 9Bf, and the left enlarged portion 9Bg are referred to as enlarged portions unless otherwise specified. Further, in the two C-shaped portions 9A and 9B, a portion that is in contact with another C-shaped portion including the enlarged portion is a contact portion.

In the stator core 9, both sides of the abutting portion including the left enlarged portion 9Ag of the C-shaped portion 9A and the abutting portion including the right enlarged portion 9Bf of the C-shaped portion 9Ba may be used, for example, by welding or adhesion. Secured. Similarly, both sides of the abutting portion including the right enlarged portion 9Af of the C-shaped portion 9A and the abutting portion of the left enlarged portion 9Bg including the C-shaped portion 9B may be fixed by, for example, welding or adhesion.

In the stator core 9 shown in Fig. 11, the magnetic flux diagrams in the two C-shaped portions 9A and 9B are the same as those in Fig. 8. As shown in FIG. 6 and FIG. 7, in order to reduce the weight, the shape of the left end portion 9Aa and the right end portion 9Ae of the C-shaped portion 9A and the shape of the C-shaped portion 9B are set in the radial direction width based on the number of the magnetic flux lines. The shapes of the left end portion 9B and the right end portion 9Be are closer to zero in the radial direction at the core division positions 25a and 25b, and the two C-shaped portions 9A and 9B and the rotor 8 are opposite to the left end portion 9Aa and the right end portion 9Be, and The tip end portions of the right end portion 9Ae and the left end portion 9Ba are pointed. When the tip end portion is pointed, the two C-shaped portions 9A and 9B are low in rigidity even when they are in contact with each other, and the joint depth is insufficient when the contact portion is melted, and the area to be adhered when the contact portion is adhered is insufficient. The width of the abutting portion in the radial direction must have a size determined based on the necessary rigidity.

(effect)

As shown in Fig. 11 and Fig. 12, the C-shaped portion 9A is provided with a right enlarged portion 9Af and a left enlarged portion 9Ag, and the C-shaped portion 9B is provided with a right enlarged portion 9Bf and a left enlarged portion 9Bg. The contact portion of the other C-shaped portion is increased in contact area, whereby the rigidity of the C-shaped portions 9A and 9B can be improved. Further, when the abutting portion is fixed, the two C-shaped portions 9A and 9B can be operated as one element in addition to the rigidity.

As shown in Fig. 11, the shape of the C-shaped portion 9A is the width in the radial direction of the portion facing the rotor 8, and is divided from the three straight portions of the shoulder portion 9Ab, the wrist portion 9Ac, and the shoulder portion 9Ad to the core. The direction of the 25a and 25b is reduced, and the portion of the tip end having a reduced width in the radial direction is provided with a larger width in the radial direction than the width of the tip end portion having a reduced width in the radial direction, but is not limited thereto. The width of the contact portion in the radial direction may be such that the width of the portion facing the rotor 8 in the radial direction is the same as the width of the portion of the tip that is reduced to the respective core division positions 25a and 25b. The above description has been made for the C-shaped portion 9A, and the portion of the C-shaped portion 9B is also the same.

(effect)

According to the present embodiment, the two C-shaped portions 9A and 9B are provided with enlarged portions, and the abutting portions including the enlarged portions are in contact with the other C-shaped portions. Thereby, the rigidity of the C-shaped portions 9A and 9B is increased, and the noise and vibration in the electric blower 1 including the stator core 9 can be reduced. Further, by operating the two C-shaped portions 9A and 9B as one element, it is possible to achieve a reduction in manufacturing cost.

Embodiment 7

(constitution)

In the sixth embodiment, the two C-shaped portions 9A and 9B are provided with abutting portions including the enlarged portions, and the shape of the abutting portions is preferably a dovetail-shaped concave portion and a convex portion. An example of application is shown in Fig. 13, and a state in which the abutting portion of Fig. 13 is enlarged is shown in Fig. 14. Similarly to the fourteenth and fourteenth drawings, the stator core 9 is viewed from the axial direction, and is a view showing the shape of the stator core 9 of the present embodiment. The broken line shown in Figs. 13 and 14 indicates the outline in the case where the width of the tip end portion in the radial direction is not enlarged. Here, in the C-shaped portion 9A, a concave portion is provided in the abutting portion including the right enlarged portion 9Af, and a convex portion is provided in the abutting portion including the left enlarged portion 9Ag. Similarly, in the C-shaped portion 9B, a concave portion is provided in the abutting portion including the right enlarged portion 9Bf, and a convex portion is provided in the abutting portion including the left enlarged portion 9Bg.

In the stator core 9, both sides of the abutting portion including the left enlarged portion 9Ag of the C-shaped portion 9A and the abutting portion including the right enlarged portion 9Bf of the C-shaped portion 9B may be fused or adhered, for example. Secured. Similarly, both sides of the abutting portion including the right enlarged portion 9Af of the C-shaped portion 9A and the abutting portion of the left enlarged portion 9Bg including the C-shaped portion 9B may be fixed by, for example, welding or adhesion.

(effect)

As shown in Fig. 13 and Fig. 14, the two C-shaped portions 9A and 9B are configured such that the abutting portion including the enlarged portion has a dovetail-shaped concave portion and a convex portion, and is in other C-shapes. When the concave portion and the convex portion are fitted to each other, the rigidity of the C-shaped portions 9A and 9B can be improved, and the two C-shaped portions 9A and 9B can be operated as one element. Further, the coaxiality of the C-shaped portions 9A and 9B facing the rotor 8 can be easily removed.

(effect)

According to the present embodiment, the shape of the abutting portions of the two C-shaped portions 9A and 9B is a dovetail-shaped concave portion and a convex portion. Thereby, the rigidity of the C-shaped portions 9A and 9B can be improved, and the noise and vibration in the electric blower 1 including the stator core 9 can be reduced. In addition, the two C-shaped portions 9A and 9B are operated as one element, and the coaxiality with respect to the rotor 8 can be easily removed, whereby productivity can be improved and manufacturing cost can be reduced.

Industrial use possibilities

As described above, the electric blower of the present invention is suitable for air supply of air, and is particularly suitable for use in an electric vacuum cleaner or the like.

9A, 9B‧‧‧C shape parts

9Aa, 9Ba‧‧‧ left end

9Ab, 9Ad, 9Bb, 9Bd‧‧‧ shoulders

9Ac, 9Bc‧‧‧ wrist

9Ae, 9Be‧‧‧Right end

25a, 25b‧‧‧core division position

26a, 26b‧‧‧ magnetic pole

30, 31, 32, 33‧‧‧ space

35‧‧‧Magnetic center line

Claims (7)

An electric blower comprising: a stator having a stator core and a field coil; and a rotor disposed inside the stator; wherein the stator core is divided by two cores at a rear side of the magnetic pole center line in a rotational direction a first stator core and a second stator core that are divided into two C-shaped portions; the first stator core and the second stator core have a core portion at a position perpendicular to a center line of the magnetic pole The straight portion is bulged outward in a U-shape, and a first region formed between the U-shaped bulging outward and a peripheral portion of the rotor is used, and the three straight portions are sandwiched. a second region of the core portion of the central straight portion and symmetrical with the first region as a region in which the magnetic field coil is wound, and the width in the radial direction of the opposite portion of the rotor is closer to the core split The closer the position is, the smaller the position. An electric blower comprising: a stator having a stator core and a field coil; and a rotor disposed inside the stator; wherein the stator core is divided by two cores at a rear side of the magnetic pole center line in a rotational direction a first stator core and a second stator core that are divided into two C-shaped portions; the first stator core and the second stator core have a core portion at a position perpendicular to a center line of the magnetic pole The straight portion is bulged outward in a U-shape, and a first region formed between the U-shaped bulging outward and a peripheral portion of the rotor is used, and the three straight portions are sandwiched. The second portion of the central portion of the straight portion and the second portion symmetrical with the first region The area is provided as a region in which the magnetic field coil is wound, and a portion in which the width in the radial direction of the opposing portion of the rotor is reduced in the direction from the three straight portions toward the core division position is set and divided. The other C-shaped portion of the stator core is in contact with the abutting portion. In the electric blower according to the second aspect of the invention, the first stator core and the second stator core have a width in the radial direction of the abutting portion that is greater than or equal to a width of the tip end portion in the radial direction. The electric blower according to claim 2, wherein the first stator core and the second stator core have two abutting portions that are connected to the divided stator cores of the other C-shaped portions. The shape of the portion is such that the shape of one of the abutting portions is a concave shape, and the shape of the other abutting portion is a convex shape. The electric blower according to any one of claims 1 to 4, wherein the first stator core and the second stator core are rotated around the linear core portion into a ring-shaped coil. In the stator core, the direction of the current flowing to the two field coils is such that the field coil is connected to the magnetic pole center line in an asymmetrical direction from the direction of the rotor axis. The electric blower according to any one of claims 1 to 4, wherein the first stator core and the second stator core are wound in the first region in a straw-packed configuration. The intersection point at which the strands of the upper and lower layers intersect each other is disposed in a region other than the first region. An electric vacuum cleaner, which is characterized in that the electric blower according to any one of claims 1 to 6 is used.