JP3072413B2 - Outer rotor fan motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention is used, for example, to form air curtains for food showcases,
Alternatively, the present invention relates to a fan motor used for cooling a control device of a machine tool, particularly to an outer rotor fan motor.

[0002]

BACKGROUND ART As the outer rotor fan motors are conventionally proposed, as shown in FIG. 4, an annular rising on the upper surface outside the periphery
A dish-shaped bracket 1 having a flange formed thereon, a stator 3 provided around a metal cylinder 2 erected at the center of the upper surface of the bracket, and a rotor pivotally supported inside the metal cylinder 2 And four.

[0003] The stator 3 is formed by winding a coil 7 around a stator core 6 in which a number of substantially disk-shaped thin metal plates are laminated.

The rotor 4 has a rotor core 9 formed by laminating a large number of disk-shaped thin metal plates fixed to the inner periphery of an inverted bowl-shaped rotor case 8, and rotor end rings 10, 1, 1 at the upper and lower ends thereof.
1, a blade 14 is provided outside the rotor case 8, and a rotating shaft 12 is fixed to the center of the rotor case 8.

A rotating shaft 12 of the rotor 4 is rotatably supported by a ball bearing 13 provided inside the metal cylinder 2 to form an integral fan motor.
In operation, the rotor 4 rotates and the blades 14 discharge air. Naturally, a predetermined gap 1 is provided between the lower end of the rotor case 8 of the rotor 4 and the upper end of the outer periphery of the bracket 1.
5 will be formed.

[0006]

The outer rotor fan motor as described above is installed and used in various mounting modes, for example, in a control unit of a showcase or a machine tool. Penetrates and corrodes the coil 7, which may cause the coil 7 to be broken, a layer short, and insulation failure.

[0007] The outer rotor fan motor, due to its structure,
The gap 15 is formed, and it is extremely difficult to form a closed structure in which the gap 15 is shielded from the surroundings.

[0008] When the outer rotor fan motor is installed at the side position and used outdoors, raindrops particularly easily enter through the gap 15. Even when used indoors, a large amount of water droplets will be introduced into the fan motor if the gap 15 is installed facing the direction of entry of the water droplets. Also,
When the bracket 1 is mounted on the ground side and the rotor case 8 is mounted on the top side, the upper end surface of the outer peripheral flange of the bracket 1 is located above the lower end of the stator 3 . The coil 7 is immersed in the water collected inside the flange. In the case of a machine tool, water droplets are generated by cutting oil containing water or the like.

As a means for preventing disconnection, rare short-circuit, or insulation failure of the coil due to invading water droplets or accumulated water as described above, a structure in which the coil is covered with a waterproof resin by molding is considered. Can be However, there is a problem that a mold corresponding to the coil shape is required, and that it takes a long time for molding.

[0010]

According to the present invention, a bra is provided.
A metal cylinder stands upright at the center of the upper surface of the bracket
And, on the outer circumference of the cylinder, arranged a stator having a core plate stack and the coil winding body, is further secured that the rotating shaft on the inner wall center of the formed rotor casing reversed bowl-shaped, swirl vanes in the outer periphery The rotatable shaft of the rotor having the outer core plate laminated body on the inner circumference is rotatably supported in the metal cylinder of the stator, and the rotor is positioned on the upper surface side of the bracket.
In the outer rotor fan motor, the lower end of the side wall of the rotor case is extended.
To the bracket upper surface of the inner and outer peripheral walls formed on the outer peripheral portion, to form an annular recess between the inner and outer peripheral walls, to position the side wall lower end of the rotor case the annular recess, on the inner and outer peripheral wall of the bracket
Make sure that the end face is located below the lower end face of the coil winding.
And further inside the inner peripheral wall of the annular concave portion of the bracket,
Extends horizontally outward at the upper end of the cylindrical part, and the lower surface is on the inner peripheral wall of the bracket
The water stop wall by forming a flange portion you located above the end surface in which is provided upward.

[0011]

DETAILED DESCRIPTION OF THE INVENTION Figure 1, Figure 2 is an example of an outer rotor fan motors corner preparative coil form of the invention, the central portion
Dish-shaped bracket 20 and the bracket but protruding upward
It comprises a stator 21 and a rotor 22 arranged on the upper surface side (upper side) of 20 . Bracket 20 is made of metal such as aluminum, it has an inner peripheral wall 23 protruding central top, upper
The surface periphery, annular recess 26 is provided which is formed between the inner and outer peripheral walls 24 and 25. In addition, through holes 27 and 28 are formed around the center of the bracket 20.

On the outer periphery of the inner peripheral wall 23 of the bracket 20,
Upward, aluminum, is engaged et screws 31 inserted through the hole 27 into the screw hole 30 provided in the flange portion of the lower bottom portion of the metal cylindrical 29 formed by brass material is inserted cylindrical , The bracket 20 and the metal cylinder 29 are integrated.

Bearings 32 and 33 such as ball bearings are slidably inserted on the inner periphery of the metal cylinder 29, and a cylindrical spacer 34 is similarly inserted between the two bearings. An annular concave groove is formed on the inner periphery of the metal cylinder 29, and a C-shaped snap ring 35 is fitted in the groove.
2 is placed.

The stator 21 is provided with a core plate laminated body 37 in which a plurality of core plates made of silicon steel are laminated on a lower bobbin case 42 made of insulating plastic, and an upper bobbin case made of insulating plastic is placed thereon. The upper and lower bobbin cases 38 and 42 are abutted and integrated. Upper and lower bobbin cases 38, 42
Upper and lower insulating caps 43 at the upper and lower ends of the bobbin
44 are provided to form coil chambers A and B. The core plate laminate 37 is provided with a plurality of vacancies extending in the up-down direction. The coils are provided in the coil chambers A, vacant chambers, the interior of the coil chamber A, and the coil chambers B, vacant chambers, and the coil chamber B. It is continuously wound to form a coil winding 41. The upper and lower bobbin cases 38 and 42 have upper and lower insulating caps 43 and 4 respectively.
4 are provided to integrally form the stator 21. The lower end surface of the coil winding 41 of the stator 21 is
0 are located above the upper end surfaces of the inner and outer peripheral walls 24 and 25. The inner periphery of each core plate of the core plate laminate 37 is fitted on the outer periphery of the metal cylinder 29, and the core plate laminate 37 and the metal cylinder 29 are integrated.

The rotor 22 has an inverted bowl-shaped rotor case 45.
Has a plurality of revolving blades 46 on a side wall 45a thereof, and a bush 47 is fixed to an inner wall surface at the center of the upper wall. A plurality of openings 48 are provided on the outer periphery of the upper wall. On the inner circumference of the side wall,
An outer core plate laminate 49 in which a plurality of core plates made of a ring-shaped silicon steel plate are laminated is inscribed. An annular short-circuit ring 50 is fixed to the inner wall of the outer wall of the upper wall of the rotor case 45, and the opening 48 is formed on the upper surface of the short-circuit ring.
The same number of concave grooves 51 are provided. On the lower surface of the outer core plate laminated body 49, the annular short-circuit ring 5 is also provided.
2 are provided, and a plurality of concave grooves 53 are also provided on the lower surface of the short-circuit ring 52. The short-circuit rings 50 and 52 are short-circuited by aluminum die-casting in a cage shape through dozens of holes provided in the outer core plate laminate 49, and the openings 4 are formed.
8. The concave grooves 51 and 53 are spaces for inserting lead for correcting the unbalance amount of the rotor portion. The bush 4 fixed to the inner wall at the center of the upper wall of the rotor case 45
A rotating shaft 54 is fixed to 7.

The rotator 22 having the above-mentioned structure is
Is arranged to be positioned on the upper surface of the rotating shaft 54 of the rotor 22, is inserted through the inside of the metal cylinder 29, by bearings 32 and 33, it is journaled. At the lower end of the rotating shaft 54, a washer 55, a spring 56, a washer 57, E
The mold snap ring 58 is sequentially provided, and the spring 5
The bearing 32 is pressed toward the bush 47 by the elastic force of 6.

When the rotating shaft 54 is supported by the metal cylinder 29, the rotor case 45 of the rotor 22 is rotated.
Side wall 45a is further from the position of the lower end face of the coil winding 41.
The lower end is located in the annular recess 26 of the bracket 20. The lead wire 19 is inserted into the through hole 28 of the bracket 20. The distal end of the lead wire 19 is housed in a gap formed in the outer periphery of the core plate laminate 37 and is connected to both ends of the coil of the coil winding 41.

Inner peripheral wall 2 of annular concave portion 26 of bracket 20
The inner periphery of the 4, cut-off wall 59 is secured upwardly.
The water stop wall 59 is made of a thin plate made of a metal or a plastic material, and has a cylindrical portion 59a and a flange portion 59b extending horizontally outward from the upper end of the cylindrical portion. The lower surface of the flange portion 59b is located above the upper end surface of the inner peripheral wall 24, and the short-circuit ring 5
Located below the second lower end tip of the flange portion 59b is arranged in close proximity to the inner peripheral surface of the side wall 45a of the rotor case 45.

FIG. 3 shows a shaded coil type outer rotor fan motor according to another embodiment of the present invention. The fan motor of FIG. 1 is further provided with a second water stop wall 60. . That is, the second water stop wall 60 is fixed downward to the inner peripheral wall of the short-circuit ring 52, extends horizontally outward from the cylindrical portion 60 a and the lower end of the cylindrical portion, and has a lower surface formed of the franc of the water stop wall 59.
And a flange portion 60b you located below di portion 59b top surface. 1 and 2 are denoted by the same reference numerals, and description thereof is omitted.

1 and 2, when the fan motor is mounted and used as shown in this figure, water drops such as rainwater are discharged from the lower end of the side wall 45a of the rotor case 45 of the rotor 22 and the bracket 20 of the rotor 20. The gas enters the rotor case 45 through the gap between the inner and outer peripheral walls 24 and 25. At this time, a part enters the inside without being stored in the annular concave portion 26, but the lower surface is closer to the upper end surface of the inner peripheral wall 24 of the bracket 20.
Ri further progression is prevented by cut-off wall 59 positioned on the upper side. Further, the water level becomes stagnant water water droplets entering the interior is agglomerated, the inner peripheral wall 24 of the bracket 20,
25 does not stay above the upper end face ,
The inner and outer peripheral walls 24 and 25 of the racket 20 are located above the upper end surfaces.
The lower end of the coil winding 41 of the stator 21 to be placed is not immersed. Furthermore, even when the bracket 1 and the rotor case 8 are used in a state where they are turned 90 degrees, that is, in a state where both the bracket 1 and the rotor case 8 face in the vertical direction, intrusion of water droplets is similarly prevented,
The stored water is discharged to the outside from the annular concave portion 26 located below.

In the fan motor of FIG. 3, the second water blocking wall 60 reliably prevents water from entering.

[0022]

According to the present invention, regardless of the manner in which the fan motor is mounted, even if surrounding water droplets enter the interior, they do not reach the coil portion, and as a result, drainage is effectively performed. It is possible to prevent disconnection of the coil, a layer short, and occurrence of insulation failure.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is another sectional view of the embodiment of the present invention.

FIG. 3 is a sectional view showing another embodiment of the present invention.

FIG. 4 is a sectional view of a conventional fan motor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 20 Bracket 21 Stator 22 Rotor 29 Metal cylinder 52 Short-circuit ring 59, 62 Water stop wall 60, 64 Second water stop wall

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H02K 5/04-5/10 H02K 7/14 H02K 21/22

Claims (2)

(57) [Claims] 1. A metal cylinder is provided at the center of the upper surface of a bracket.
Standing upward, a stator having a core plate laminate and a coil winding is arranged on the outer periphery of the cylinder, and a rotating shaft is fixed to the center of the inner wall of a rotor case formed in an inverted bowl shape. A rotating shaft of a rotor having a rotating blade on an outer periphery and an outer core plate laminated body on an inner periphery so as to be rotatable in a metal cylinder of the stator ;
In the outer rotor fan motor arranged so as to be located on the upper surface side of the slot, the lower end of the side wall of the rotor case is
With stretching, the bracket upper surface on the outer peripheral portion provided with inner and outer peripheral walls to form an annular recess between the inner and outer peripheral walls, to position the side wall lower end of the rotor case the annular recess, the bracket
The upper end surface of the inner and outer peripheral walls is located below the lower end surface of the coil winding.
Configured to location, further, the inner peripheral wall inward of the annular recess of the bracket, the bottom surface extending in a horizontal outward on the top of the cylindrical part Bra
Outer rotor fan motors, characterized in that the water-stop wall formed by forming a flange portion you located above the socket inner circumferential wall upper surface are provided upward. 2. A short-circuit ring is provided on a lower surface of the outer core plate laminate , and a cylindrical portion and a cylindrical portion are formed on an inner peripheral wall of the ring.
Extends horizontally outward from the lower end and the lower surface is the flange of the water stop wall
Outer rotor fan motor according to claim 1, wherein the second water-stop wall and a flange portion you positioned on the lower side is provided downward from the upper surface.