JPH0615499Y2 - Fan motor - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention is an air-cooling system that is installed and used inside the housing of equipment when forced internal air-cooling of electronic equipment such as office equipment is performed. Fan motor for automobiles.

[Conventional technology]

An example of the conventional structure of this type of fan motor is shown in FIGS.
It is shown in Fig. 5 and Fig. 5 (for example, see Jitsukai Sho 59-90255). FIG. 3 is a front view seen from the air suction side, and FIGS. 4 and 5 are XX sectional views thereof. In the figure, reference numeral 1 denotes a hollow cylindrical wind tunnel case having an inner diameter of a circular cross section, and a plurality of wind tunnel cases (three in the illustrated example) are provided on the air discharge side of the wind tunnel case 1.
End surface 3a of the stator case of the motor through the supporting leg 2 of
The outer peripheral portion of is fixedly supported. Reference numeral 4a denotes a stator core, which is fixed inside the circumferential portion 3b of the stator case, and a stator winding 4b is wound around the stator core 4a. 12
Is a lead wire for connecting the end of the stator winding 4b to an external power source (not shown), which is led out to the wind tunnel through the hole 13 formed in the rising portion of the stator case circumferential portion 3b, and further plural wires are provided. One of the supporting legs 2 is pulled out to the outside. The rotor of the motor has a rotor core 5a whose outer peripheral surface faces the inner peripheral surface of the stator core 4a via a small gap, a rotor conductor 5b integral with the rotor core 5a, and a rotor core 5a. Rotating hub 5 integrated with child conductor 5b
It is composed of c and. The rotating hub 5c also serves as a motor case on the air intake side. Reference numeral 6 is a cylindrical sleeve for holding the bearing, which is fixedly fitted inside a through hole formed at the center of the rotor core 5a and the rotor conductor 5b. Two balls are provided on the inner diameter side of the cylindrical sleeve 6. A bearing 7 is arranged, and the two ball bearings 7 allow the rotor to freely rotate around a fixed shaft 8 which is cantilevered and fixed to the center of the stator case end surface 3a. ing. Reference numeral 9 is a dustproof cover. Reference numeral 10 denotes a plurality of (five in the illustrated example) fan blades planted on the outer surface of the circumferential portion of the rotating hub 5c. The fan blades 10 rotate as the rotor rotates, and Air drawn from the left side of the drawing is discharged to the right side. The stator case end surface 3a and the circumferential portion 3b are integrally formed by using, for example, an iron plate. In that case, in order to electrically insulate between the stator winding 4b and the stator case end surface 3a. The electric insulating plate 11 is attached to the inside of the stator case end surface 3a. Further, in order to improve mass productivity, the support leg 2, the stator case end surface 3a, and the circumferential portion 3b are often integrally formed from the same iron plate as in the illustrated example.

[Problems to be solved by the device]

In the above-mentioned conventional structure, when an air flow in the direction from the suction side to the discharge side is generated with the rotation of the fan blade 10, the arrow 14 passes through the hole 13 opened in the stator case to pull out the lead wire 12. The indicated air flow is generated, and dust in the sucked air and the like also enter the motor. These dusts also enter the portion of the ball bearing 7 in the cylindrical sleeve 6 and reduce the life of the ball bearing, that is, the life of the fan motor.

To cope with this, conventionally, as shown in FIG.
Blocking the hole 13 with 15 prevents dust from being sucked in by the air flow from the hole 13. As the cap 15, one made of plastic or silicone rubber is used, or a semi-kneaded silicone rubber is used for the hole 13
The method of applying to the part and hardening it was adopted. However, all of these conventional methods have a problem in that the number of work steps and the number of parts are increased because the work is performed in a post-process after the work of assembling the lead wire 12 is completed.

The applicant has previously proposed a measure to prevent the life of the ball bearing from being shortened due to the airflow entering the motor through the gap between the circumferential portion of the rotating hub 5c and the stator case circumferential portion 3b. (See Japanese Utility Model Application No. 62-187773), however, the above proposal does not mention any countermeasure against dust entering the inside of the motor through the hole 13.

The object of the present invention is to solve the above-mentioned problems in the prior art, and to make it possible to close the lead wire drawing hole with a cap without the need for post-process work after the lead wire is assembled. An object of the present invention is to provide a fan motor that can reduce the number of parts, assembly, and management man-hours.

[Means for Solving the Problems]

The purpose is to provide a hole in the stator case for pulling out the lead wire connecting the stator winding terminal to the external power source to the outside in order to electrically insulate between the stator winding and the end surface of the stator case. This is achieved by a structure in which the cap is integrally formed with a stator insulating plate that is attached to the inside of the end face of the stator case.

[Action]

By using the one that has a cap shape that matches the shape of the hole opened in the stator case for drawing out the lead wire and is integrally molded with the electrical insulating plate, first pass the lead wire through this integrally molded product and then fix it. If it is attached inside the end face of the child case, the lead wire drawing hole is also closed by the cap-shaped part of the integrally molded product at the same time by this attaching work, and the post-process work in the conventional technique is unnecessary, and It is also possible to reduce the number of parts.

[Example of device]

An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a sectional view, and FIG. 2 is a perspective view of a main part. The present embodiment is different from the conventional example in that in the conventional example, the cap 15 for closing the hole 13 was a component separate from the electric insulating plate 11, whereas in the present example, the electric When molding the insulating plate 11 from an electrically insulating material such as plastics,
The point is that a portion having a cap shape matching the shape of 13 is integrally formed to form an electric insulating plate 11 which also serves as a cap. In this case, the electric insulating plate 11 and the lead wire 12 are assembled into the motor by first penetrating the lead wire 12 through the cap portion of the electric insulating plate 11 which also serves as a cap, and fixing one end of the lead wire 12 to the stator. Connected to the end of the winding 4b, the other end of the lead wire 12 is pulled out to the outside of the wind tunnel case 1 along the support leg 2 integrated with the stator case, and the electrical insulating plate 11 is fixed. If fixedly attached inside the child case end face 3a, at the same time as this attachment, the cap portion closes the lead wire drawing hole 13 (Fig. 4).

According to the present embodiment, since the cap portion is an integrally formed electric insulating plate, the electric insulating plate 11 and the lead wire are
At the time of assembling the lead wire 12, the hole formed in the stator case for pulling out the lead wire is closed, thereby eliminating the inconvenience of the conventional technique of closing the hole by the post-process work by the separately prepared cap.

[Effect of device]

As described above, according to the present invention, it is possible to prevent dust from entering the inside of the motor, improve the durability of the bearing and contribute to the long life of the fan motor, reduce the number of components of the fan motor, and This has a great effect of reducing man-hours and management man-hours and manufacturing cost.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention, FIG. 2 is a perspective view of an essential part of the embodiment, FIG. 3 is a front view of a conventional example, FIG. 4 and FIG.
The drawing is a sectional view taken along line XX of FIG. Explanation of reference numerals 1 ... Wind tunnel case, 2 ... Support leg 3a ... End face of stator case 3b ... Circular part of stator case 4a ... Stator core, 4b ... Stator winding 5a. Rotor core, 5b Rotor conductor 5c Rotating hub, 6 Cylindrical sleeve 7 Ball bearing, 8 Fixed shaft 9 Dust cover, 10 Fan blade 11 Electrical insulating plate (Combination cap) 12 …… Lead wire

Claims (1)

[Scope of utility model registration request] 1. A stator case in which one end surface of a cylinder is joined to a disk surface, a stator having a winding wound around a stator core supported inside the cylinder of the stator case, and the stator. A rotor rotatably supported at the center of the cylindrical end surface of the child case, a plurality of fan blades radially planted through a rotating hub fixed to the outer circumference of the rotor, and an outer edge of the fan blade. An enclosing cylindrical wind tunnel case, a plurality of support legs connecting and fixing the cylindrical end surface of the stator case and the wind tunnel case, and the stator winding terminal provided in the stator case as an external power source. In a fan motor having a hole for guiding a connecting lead wire to the outside of the wind tunnel, a cap-shaped stator insulating plate that closely surrounds the lead wire and insulates a winding of the stator from an end surface of the stator case. Comprising: By fitted a stator insulation plate in said hole, fan motor, characterized by being configured so as to close the hole for guiding the lead wire.