TW201600731A - Electric blower - Google Patents

Abstract

An electric blower that increases the cooling efficiency of an electric motor is provided. In order to solve the above problems, there is provided an electric blower having a stator, a rotor having a rotating shaft, and a fan fixed to the rotating shaft, and cooling the stator by a flow generated by the rotation of the fan, wherein the stator has a stator core The stator coil and the insulating cover formed with the coil holding portion for holding the stator coil, the insulating cover is attached to the stator core, and the stator coil is wound to the coil holding portion of the insulating cover, and the stator coil is wound through the insulating cover and wound onto the stator core A gap may be formed between the coil holding portion and the stator coil.

Description

Electric blower

The present invention relates to an electric blower used in an electric sweeper or the like.

Previously, there was an electric blower having a motor and a fan mounted on a rotating shaft of the motor. The electric blower cools the rotor, the stator and the stator coil by introducing an air flow generated by the rotation of the fan to the inside of the motor. In particular, there is a gap between the outer peripheral portion of the shielding stator and the bracket constituting the outer contour of the motor, and the airflow is actively caused to flow through the slots in the stator to efficiently cool the stator coil or the rotor of the rotor (for example, refer to the patent) Document 1).

[First technical literature] [Patent Literature]

[Patent Document 1] Japanese Laid-Open Patent Publication No. 2001-234897 (Fig. 1)

However, the conventional electric blower is directed to the outer surface of the coil constituting the stator, and is cooled by contact with the flowing airflow, but the surface of the coil facing the inner side cannot be in contact with the flowing airflow, but is located at the stator core ( The problem of insufficient cooling of the coil on the side of the magnetic field core).

The present invention has been made in order to solve the above problems, and an object thereof is to provide an electric blower that can improve cooling efficiency inside a motor.

In order to solve the above problems, an electric blower includes a stator, a rotor including a rotating shaft, and a fan fixed to the rotating shaft, and the stator is cooled by an air flow generated by the rotation of the fan. The stator includes a stator core, a stator coil, and an insulating cover formed with a coil holding portion for holding the stator coil, and the insulating cover is attached to the stator core, and the stator coil is wound by the stator coil to the coil holding portion of the insulating cover. The insulating cover is wound around the stator core, and a gap may be formed between the coil holding portion and the stator coil.

According to the present invention, an electric blower that can efficiently cool the inside of the motor can be obtained.

10‧‧‧Motor Department

11‧‧‧Frame

12‧‧‧ bracket

13‧‧‧1st bearing

14‧‧‧2nd bearing

15‧‧‧Rotary axis

16‧‧‧Rotor

17‧‧‧ commutator

19‧‧‧ Stator

19a‧‧‧Silker core

19b‧‧‧statar coil

19c‧‧‧Insulation cover

30‧‧‧Blasting Department

31‧‧‧Fan cover

32‧‧‧Air supply fan

100‧‧‧Electric blower

191c‧‧‧Coil holding unit

192c‧‧‧ outer wall

194c (194c1 ~ 194c5) ‧ ‧ convex

D‧‧‧ gap

Fig. 1 is a cross-sectional view showing the electric blower of the first embodiment.

Fig. 2 is a perspective view of the stator of the first embodiment.

Fig. 3 is a perspective view of the insulating cover of the first embodiment.

Fig. 4 is a plan view showing the stator of the first embodiment.

Fig. 5(a) is a perspective view of the insulating cover of the second embodiment, and Fig. 5(b) is a perspective view of the stator of the second embodiment.

Fig. 6 is a side view of the insulating cover of the second embodiment.

Fig. 7 is a plan view showing the stator of the second embodiment.

Fig. 8 is a perspective view of the insulating cover of the third embodiment.

Figure 9 is a side view of the insulating cover of the third embodiment.

Fig. 10(a) is a side view of the insulating cover of the fourth embodiment, and Fig. 10(b) is a side view showing a modification of the tenth (a) figure.

Fig. 11(a) is a side view of the stator of the fifth embodiment, and Fig. 11(b) is a perspective view of the stator of the fifth embodiment.

(Embodiment 1)

Hereinafter, the first embodiment will be described with reference to Figs. 1 to 4 .

In the first drawing, the electric blower 100 is composed of a motor unit 10 and an air blowing unit 30. The motor unit 10 rotationally drives the blower fan 32. The air blowing unit 30 borrows the rotation of the air blowing fan 32, draws air from the outside, and rectifies the flow of the air.

The outer contour of the motor portion 10 is constituted by a cylindrical frame 11 having an opening 11a at one end and a bottom portion 11b at the other end.

In the opening portion 11a of the frame 11, a bracket 12 having a circular center 15 as a center of the rotating shaft 15 of the motor portion 10 described below is fixedly attached to the mounting flange 11d of the frame 11 by screws.

An opening 12a is formed in the bracket 12. The opening 12a is introduced into the inside of the motor unit 10 by the cooling air that is rectified by the fan guide described below.

Next, the first bearing 13 is provided on the bottom portion 11b of the frame 11, and the second bearing 14 is provided in the bracket 12.

In addition, the rotating shaft 15 attached to the rotor 16 is rotatably supported by the second bearing 14 and the first bearing 13 in a state in which the tip end portion 15a protrudes from the second bearing 14 in the through bracket 12.

Further, an opening portion of the air that discharges the inside of the motor portion 10 is formed in the frame 11.

Next, the rotor 16 is constituted by winding the rotor coil 16b to a slot 16a formed by laminating iron cores of a plurality of iron plates. Further, the rotating shaft 15 is fixedly mounted in a state of penetrating the center of the slot 16a constituting the rotor 16.

Further, a commutator 17 is fixedly mounted between the rotor 16 of the rotating shaft 15 and the first bearing 13. The commutator 17 is electrically connected to the coil of the rotor 16, and is slidably coupled to a pair of power supply brushes provided on the frame 11.

Next, when referring to FIGS. 1 to 4, the stator 19 that generates the magnetic force acting on the rotor 16 has a stator core 19a, which is laminated with a plurality of iron plates to be formed, and has a pair of magnetic poles; the insulating cover 19c is insulated Material composition; and stator coil 19b.

The stator 19 is provided with an insulating cover 19c to the stator core 19a, and the stator coil 19b is wound to the insulating cover 19c. That is, the stator 19 is configured to pass through the insulating cover 19c, and the stator coil 19b is wound and mounted to the stator core 19a.

When viewed from the axial direction, the stator core 19a is a laminate in which a plate having an inner opening and a slightly rectangular plate is laminated. In this stator core 19a, an insulating cover 19c is attached from the up-and-down direction, and a pair of stator cores 19b are wound and mounted on the insulating cover 19c so as to face each other.

In this way, the stator 19 constituting each part is held on the inner surface of the frame 11 to abut against the outer wall surface of the stator core 19a, and the rotor 16 is located at an opening position of the pair of magnetic poles opposite to each other, and is rotatably Facing this open position.

Here, the insulating cover 19c will be described with reference to Figs. 2 to 4 . The insulating cover 19c is formed of a resin, and the stator coil 19b is wound around the stator. The roll of the core 19a. The stator coil 19b is wound along the insulating cover 19c mounted on the stator core 19a, whereby the stator coil 19b is prevented from directly contacting the stator core 19a.

Further, the insulating cover 19c is provided on the upper surface side and the lower surface side of the stator core 19a, respectively, whereby the insulating cover 19c from the upper side is wound around the winding frame of the stator coil 19b of the lower insulating cover 19c. .

The insulating cover 19c is formed by fitting the outer shape of the stator core 19a, and is formed in a schematic rectangular shape that is opened inside when viewed from the axial direction in a state of being mounted inside the electric blower.

Further, a coil holding portion 191c is formed on one of the opposite sides of the opposing direction. The coil holding portion 191c holds the stator coil 19b that protrudes toward the opening side of the inner side of the insulating cover 19c.

The coil holding portion 191c has a predetermined width in the side direction of the insulating cover 19c, and extends in the axial direction, and the coil holding portion 191c that is opposed to each other has an arcuate curved shape in which a substantially circular opening is formed.

Thereby, the space formed by the coil holding portion 191c is the space in which the rotor 16 is rotatably placed.

Further, a convex portion 194c extending in a strip shape in the axial direction is formed on the outer wall surface 192c on the radial side of the coil holding portion 191c.

In the case of the present embodiment, the convex portions 194c are respectively provided at the center of the outer wall surface 192c in the side direction and the left and right positions of the convex portion 194c at the center.

The coil holding portions 191c thus configured are attached to the upper and lower surfaces so as to cover the upper and lower surfaces of the stator core 19a. Further, the stator coil 19b is wound around the outer wall surface 192c of the coil holding portion 191c, and the stator coil 19b It is mounted on the stator core 19a.

When the details are described, the stator coil 19b is repeatedly passed outside the outer wall surface 192c of the coil holding portion 191c which is attached to one side of the stator core 19a, and passes through the opening inside the stator core 19a to reach the coil holding portion 191c on the other side. The outer side of the outer wall surface 192c passes through the opening of the inner side of the stator core 19a, and reaches the outer side of the outer wall surface 192c of the coil holding portion 191c of the one side, thereby being wound around the stator by the coil holding portion 191c. Core 19a.

In other words, the stator coil 19b passes through the opening inside the stator core 19a, and is in a state of straddle the outer wall surface 192c of the insulating cover 19c wound on one side and the outer wall surface 192c of the insulating cover 19c on the other side.

Here, the stator coil 19b is formed on the outer side of the convex portion 194c formed on the outer wall surface 192c, and is wound so as to traverse the convex portion 194c. Therefore, a parallel rotation axis is formed between the stator coil 19b and the outer wall surface 192c. The gap d in the direction.

Next, the air blowing unit 30 will be described with reference to Fig. 1 .

The air blowing unit 30 is composed of a fan cover 31, a blower fan 32, and a fan guide. The fan guide rectifies the outside of the air supply fan 32 and reaches the air flow in the opening 12a of the opening of the bracket 12.

The fan cover 31 is composed of a cylindrical peripheral wall portion 31a and a lid portion 31b that blocks one side of the peripheral wall portion 31a.

The lid portion 31b of the fan cover 31 is composed of a flat portion 31f and a protruding portion 31g. The flat portion 31f extends from the peripheral wall portion 31a toward the inner side of the cylinder. The protruding portion 31g is raised from the flat portion 31f along the shape of the blower fan 32.

Further, at the position of the top of the protruding portion 31g, that is, at the central portion of the lid portion 31b, an air inlet port 31c is formed by providing an opening.

Further, the center of the intake port 31c coincides with the center of rotation of the blower fan 32.

Further, the fan cover 31 is fitted to the outer peripheral end 12b of the bracket 12 at the lower end portion of the peripheral wall portion 31a, and is fixed to the bracket 12.

As described above, the electric blower constituted by each unit operates as follows.

Referring to Fig. 1, when the motor blower 10 drives the motor unit 10 as described above, the rotor 16 rotates, and the blower fan 32 attached to the rotary shaft 15 of the rotor 16 rotates.

As shown by the arrow in the figure, the airflow of the air that is sucked by the air blower fan 32 is deflected in the outer peripheral direction by the air intake port 31c of the air blowing fan 32, and is rectified by the fan guide through the inside of the air blowing fan 32. The inside of the motor unit 10 flows down from the opening portion 12a.

Then, the air flow that has flowed down to the inside of the motor unit 10 is discharged from the opening of the frame 11 to the outside of the motor unit 10 after cooling the stator core 19a, the stator coil 19b, and the rotor 16.

Here, the stator coil 19b is wound around the convex portion 194c provided on the insulating cover 19c while being attached to the stator core 19a. Therefore, the stator coil 19b and the outer wall surface 192c are formed between the stator coil 19b and the outer wall surface 192c. The gap d is parallel to the direction of the rotation axis (axial direction).

Therefore, the air flow flowing down to the inside of the motor portion 10 may also enter the gap d, and the contact may be increased with respect to the air flow in the motor portion 10. The area of the stator coil 19b.

Thereby, the portion of the stator coil 19b on the side of the insulating cover 19c can be cooled, and the cooling efficiency of the stator coil 19b can be improved.

(Embodiment 2)

Next, the second embodiment will be described.

In the present embodiment, a modification of the second embodiment of the coil holder 191c is described as a center, and the same components as those of the first embodiment are denoted by the same reference numerals. Omitted.

When referring to FIGS. 5 to 7 , the coil holding portion 191 c is formed with a rib 193 c extending from the tip end in the outward direction (the direction opposite to the opening).

This rib 193c is a stopper for preventing the transmission coil 191c from being wound around the stator coil 19b of the stator core 19a and falling downward (or upward) from the coil holding portion 191c.

The convex portion 194c formed on the outer wall surface 192c of the coil holding portion 191c is in a positional relationship in which the rib 193c is vertically intersected.

As a result, in addition to the effect of the first embodiment, the positional relationship between the rib 193c and the convex portion 194c can increase the strength with respect to the force applied in the tilting direction of the rib 193c.

Thereby, when the stator coil 19b is wound to the stator core 19a, tension can be further applied to wind, so that the stator coil 19b can be wound on the stator core 19a with a smaller volume.

(Embodiment 3)

Next, the third embodiment will be described.

Modification of the third embodiment coil holder 191c, in this embodiment In the first embodiment and the second embodiment, the same points as those in the first embodiment and the second embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

When referring to Figs. 8 to 9 , a convex portion 194c extending in the axial direction is formed on the outer wall surface 192c of the coil holding portion 191c of the insulating cover 19c.

In the case of the present embodiment, the convex portion 194c is composed of a central convex portion 194c1 at the center of the outer wall surface 192c in the lateral direction, and a left convex portion 194c2 and a right convex portion 194c3 which are located at right and left positions of the central convex portion 194c1, respectively.

Further, the central convex portion 194c1 formed at the center in the side direction of the outer wall surface 192c protrudes higher from the outer wall surface 192c than the left and right convex portions 194c2 and 194c3.

In this way, if the convex portion 194c (194c1) located at the center is higher than the other convex portions (194c2, 194c3), the gap d can be increased, so that the air flow inside the gap d can be more efficient.

Thereby, the heat of the stator coil 19b can be more efficiently discharged from the gap d, and the cooling effect of the stator coil 19b can be improved.

In particular, by making the convex portion 194c located at the center higher than the other convex portions, the stator coil 19b used can be further reduced in comparison with the case where all the convex portions 194c are higher and the gap d is increased. The increase in the amount can increase the gap d.

(Embodiment 4)

Next, the fourth embodiment will be described.

In the present embodiment, a modification of the fourth embodiment of the coil holder 191c is described as a center, and the same configuration as that of the first embodiment and the second embodiment is described. Give the same number, The description is omitted.

When referring to Fig. 10(a), a convex portion 194c4 is formed on the outer wall surface 192c of the coil holder 191c of the insulating cover 19c. The convex portion 194c4 protrudes outward (radially) and extends in the axial direction.

The convex portion 194c4 is directed to the tip end of the coil holding portion 191c, and the height from the outer wall surface 192c gradually increases. That is, the surface of the convex portion 194c4 becomes the inclined surface 194d.

In this way, by forming the convex portion 194c4, the opening width dr of the gap d can be increased, and the air flow can be more efficiently flowed down to the inside of the gap d.

In particular, since the height of the convex portion 194c4 is gradually increased toward the tip end of the coil holding portion 191c, the increase in the amount of the stator coil 19b to be used can be further reduced.

Further, in the present embodiment, as shown in Fig. 10(a), the height of the convex portion 194c4 to the end of the coil holding portion 191c is gradually increased from the outer wall surface 192c. As shown in Fig. 10(b), the portion from the middle portion of the convex portion 194c4 gradually becomes larger.

(Embodiment 5)

Next, a fifth embodiment will be described.

In the present embodiment, a modification of the fifth embodiment of the coil holder 191c is described as a center, and the same components as those of the first embodiment are denoted by the same reference numerals. Omitted.

When referring to Fig. 11, a convex portion 194c5 is formed on the outer wall surface 192c of the coil holder 191c of the insulating cover 19c. The convex portion 194c5 protrudes toward the outer side (radial direction) of the rotation direction of the rotor 16 and extends in the axial direction.

In this way, by forming the convex portion 194c5, the convex portion 194c5 can be formed. The direction of the axial extension is nearly parallel to the direction of the airflow of the swirling flow generated by the rotation of the air fan 32.

Thereby, the deceleration of the airflow by the convex portion 194c5 in the gap d can be suppressed, and the heat of the stator coil 19b can be more efficiently discharged, and the cooling effect of the stator coil 19b can be improved.

The "axial" "axis" used in each of the above embodiments refers to the rotating shaft 15 constituting the rotor 16. Further, the "radial direction" is the radial direction of the electric blower 100 viewed from the rotating shaft 15.

10‧‧‧Motor Department

11‧‧‧Frame

11a‧‧‧ Opening

11b‧‧‧ bottom

11d‧‧‧ mounting flange

12‧‧‧ bracket

12a‧‧‧ openings

12b‧‧‧outside

13‧‧‧1st bearing

14‧‧‧2nd bearing

15‧‧‧Rotary axis

15a‧‧‧ tip

16‧‧‧Rotor

16a‧‧‧Slots

16b‧‧‧Rotor coil

17‧‧‧ commutator

19‧‧‧ Stator

19a‧‧‧Silker core

19b‧‧‧statar coil

19c‧‧‧Insulation cover

30‧‧‧Blasting Department

31‧‧‧Fan cover

31a‧‧‧Walls

31b‧‧‧Cap

31c‧‧‧ suction port

31f‧‧‧Flat Department

31g‧‧‧Protruding

32‧‧‧Air supply fan

100‧‧‧Electric blower

Claims (8)

An electric blower having a stator, a rotor having a rotating shaft, and a fan fixed to the rotating shaft, and cooling the stator by an air flow generated by the rotation of the fan, wherein the stator has a stator core, a stator coil, and An insulating cover that holds the coil holding portion of the stator coil is formed, and the insulating cover is attached to the stator core, and the stator coil is wound around the coil holding portion of the insulating cover, and the stator coil is wound through the insulating cover A gap is formed between the coil holding portion and the stator coil to the stator core. The electric blower according to the first aspect of the invention, wherein the coil holding portion is formed on a wall surface outside the winding position of the stator coil, and a convex portion that protrudes outward is formed, and the stator coil is wound up to A gap is formed on the outer side of the convex portion. The electric blower according to claim 2, wherein the convex portion is a strip-shaped convex portion extending in the axial direction. The electric blower according to claim 3, wherein the plurality of convex portions are provided. The electric blower according to claim 4, wherein the convex portion located at the center of the outer wall surface is higher than the other convex portions from the outer wall surface. The electric blower according to any one of claims 3 to 5, wherein the convex portion is further toward the tip end of the coil holding portion, from the foregoing The height at the beginning of the wall gradually increases. The electric blower according to claim 2, wherein the convex portion is a strip-shaped convex portion that extends obliquely in a direction of rotation of the rotor. The electric blower according to claim 7, wherein the convex portion is provided in plural numbers on the outer wall surface.