JP6410116B2 - Impeller and fan motor having the same - Google Patents

Description

  The present invention relates to an impeller and a fan motor including the impeller.

An impeller (impeller) of a fan motor is known that is made of a molded resin that is integrally molded around a cylindrical rotor yoke.
Such an impeller has a disadvantage that the rotor yoke is easily moved in the axial direction because the resin is molded so as to cover the circumferential side surface from one end side of the rotor yoke, and falls off the impeller. .
As a means for solving such inconvenience, for example, the one disclosed in Patent Document 1 or 2 below is known.

In Patent Document 1, resin (a plurality of latching claws) covering a part of the other end surface of the rotor yoke is formed integrally with the resin covering the peripheral side surface from one end side of the rotor yoke.
In Patent Document 2, a resin covering the other end surface of the rotor yoke is formed integrally with a resin covering the peripheral side surface from one end side of the rotor yoke (magnetic metal).

JP 2002-39096 A Japanese Utility Model Publication No. 63-33371

  However, each of the impellers disclosed in Patent Documents 1 and 2 has a disadvantage that it is difficult to fix the rotor yoke to a predetermined position in the axial direction of the impeller.

  An object of the present invention is to provide an impeller that can prevent the rotor yoke from falling off the impeller and can easily fix the rotor yoke to a predetermined position in the axial direction of the impeller, and a fan motor including the impeller.

The present invention is grasped by the following composition.
(1) The impeller of the fan motor of the present invention is a mold resin impeller integrally formed surrounding the rotor yoke from one end side, and the other end surface of the rotor yoke is covered with the mold resin, and the other end surface of the rotor yoke A hole exposing a part of the other end surface of the rotor yoke is formed in the mold resin covering the surface.
(2) In the impeller of the fan motor of the present invention, in the configuration of (1), a balance groove is formed along the circumferential direction on the other end surface of the rotor yoke, and the hole is formed in the balance groove portion. It is characterized by that.
(3) A fan motor according to the present invention includes an impeller having the configuration (1) or (2).

  According to the impeller configured as described above and the fan motor including the impeller, the rotor yoke can be prevented from falling off the impeller, and the rotor yoke can be easily fixed to a predetermined position in the axial direction of the impeller.

It is a figure which shows the structure of Embodiment 1 of the fan motor of this invention, (a) is a top view, (b) is sectional drawing of the bb line of (a). It is explanatory drawing which shows one Example of the formation method of the impeller of this invention. It is a bottom view of Embodiment 2 of the impeller of the present invention.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as embodiments) will be described in detail with reference to the accompanying drawings. Note that the same number is assigned to the same element throughout the description of the embodiment.
(Embodiment 1)
1A and 1B are diagrams showing a configuration of a fan motor (blower) according to the present invention, in which FIG. 1A is a top view and FIG. 1B is a cross-sectional view taken along line bb in FIG.
The fan motor 10 shown in FIG. 1A is provided with a motor 20 at the center, a fan 30 that rotates by driving the motor 20 is arranged around the motor 20, and the motor 20 is arranged around the fan 30. A supporting casing 40 is arranged.

First, the motor 20 has a shaft 23 that is rotatably supported via bearings 22A and 22B inside a cylindrical body 21 that protrudes at the center of the casing 40.
A stator 24 is attached to the outer peripheral surface of the cylindrical body 21, and the stator 24 includes an iron core 24A and a winding 24B wound around the iron core 24A.
The shaft 23 is disposed on the shaft and has a cup-shaped member 25 for fixing one end of the shaft 23. The cup-shaped member 25 is disposed so as to contain the stator 24.

The cup-shaped member 25 is made of a resin material, and a rotor yoke 26 is disposed on its inner peripheral surface by molding. A ring-shaped magnet 27 is fixed to the inner peripheral surface of the rotor yoke 26 so as to have a gap with the stator 24. Has been.
The cup-shaped member 25 has a fan 30 formed integrally with the cup-shaped member 25 on the outer peripheral surface thereof. The cup-shaped member 25 and the fan 30 constitute an impeller 50.
The fan motor 10 configured as described above generates a magnetic flux flow from the iron core 24A by passing a current through the winding 24B, and causes the impeller 50 around the shaft 23 to interact with the magnetic flux flow from the magnet 27. It is designed to rotate.

  FIG. 2 is an explanatory view showing a method of forming the impeller 50 integrally with the rotor yoke 26 (see FIG. 1B). (A) is a side view, (b) is sectional drawing of the bb line of (a). Note that the rotor yoke 26 and the impeller 50 shown in FIGS. 2A and 2B are shown more simply than the rotor yoke 26 and the impeller 50 shown in FIG.

As shown in FIG. 2B, there is a cylindrical first jig 60, and the shaft 23 is inserted into a hole 60 </ b> A formed on the central axis of the first jig 60. The lower end of the shaft 23 is brought into contact with a second jig 70 disposed on the lower surface of the first jig 60, and the upper end is in a state of slightly protruding from the first jig 60. An upper end portion of the shaft 23 protruding from the first jig 60 is provided with a rotation stopper 23 </ b> A that intersects the shaft 23.
The columnar first jig 60 is formed such that the radius R1 of the peripheral side surface of the upper end portion is smaller than the radius R2 (> R1) of the peripheral side surface of the lower end portion, and is cylindrical on the peripheral side surface of the upper end portion having a small radius. The rotor yoke 26 is fitted. A step surface 60Q is formed at the boundary between the peripheral side surface having the radius R1 and the peripheral side surface having the radius R2 of the first jig 60.

  In this case, a protrusion 70P is formed on the second jig 70, and the protrusion 70P protrudes from the step surface with a length of α through the through hole 60H formed in the first jig 60, and the rotor yoke 26 It is made to contact | abut to the other end surface T of this. Although not shown, for example, three protrusions 70P are provided at equal intervals along the circumferential direction of the other end surface T of the rotor yoke 26. Therefore, the rotor yoke 26 is arranged so as to float with a gap of α from the step surface 60Q of the first jig 60.

  And the impeller 50 is formed by filling the resin material using a mold (not shown). The impeller 50 includes a cup-shaped member 25 that closes an opening on one end side (A side in the drawing) of the rotor yoke 26 and covers the peripheral side surface of the rotor yoke 26, and a plurality of fans formed on the peripheral side surface of the cup-shaped member 25. 30.

Then, the impeller 50 in which the rotor yoke 26 is molded can be obtained by removing the mold, the first jig 60, and the second jig 70. The impeller 50 can be in a state where the rotor yoke 26 is embedded in the inner peripheral surface of the cup-shaped member 25 and the other end of the rotor yoke 26 is covered with resin. Thereby, the movement of the rotor yoke 26 in the axial direction with respect to the impeller 50 can be restricted, and the falling off of the rotor yoke 26 from the impeller 50 can be avoided.
The thickness of the molding resin covering the other end surface T of the rotor yoke 26 (corresponding to α in FIG. 2B) can be easily adjusted by the length of the projecting body 70P. Can be easily fixed at a predetermined position in the axial direction.

  Thus, the molded resin impeller integrally formed by surrounding the rotor yoke 26 from one end side (A side in the figure) is formed on the mold resin covering the other end surface T of the rotor yoke 26 with the other end surface T of the rotor yoke 26. A hole (indicated by reference numeral 80 in FIG. 1B) is formed to expose the portion.

(Embodiment 2)
FIG. 3 is a bottom view showing Embodiment 2 of the impeller 50 of the present invention. As shown in FIG. 3, the other end surface T of the rotor yoke 26 is formed with a plurality of balance grooves 90 along the circumferential direction. When the impeller 50 or the like is rotated, the balance groove 90 is configured to avoid so-called whirling vibration due to unbalance of the entire mass thereof. In other words, the balance groove 90 as described above is provided on the other end surface T of the rotor yoke 26, and an adhesive or the like is placed in the balance groove 90 so as not to cause a whirling vibration, thereby balancing the overall mass. It has become a thing.

Also in this case, as shown in FIG. 2, the other end surface T of the rotor yoke 26 is covered with a mold resin.
A hole 80 formed in the mold resin covering the other end surface T of the rotor yoke 26 is formed in a part of the balance groove 90 as shown in FIG.
As a result, as shown in the first embodiment, the movement of the rotor yoke 26 in the axial direction relative to the impeller 50 can be restricted, and the rotor yoke 26 can be prevented from falling off. Further, the thickness of the resin covering the other end surface T of the rotor yoke 26 (corresponding to α in FIG. 2B) can be easily adjusted by the length of the projecting body 70P (see FIG. 2B). The rotor yoke 26 can be easily fixed to the impeller 50 at a predetermined position in the axial direction.

  As mentioned above, although this invention was demonstrated using embodiment, it cannot be overemphasized that the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above-described embodiments. Further, it is apparent from the description of the scope of claims that embodiments with such changes or improvements can also be included in the technical scope of the present invention.

10 …… Fan motor,
20 …… Motor,
21 …… Tubular body,
22A, 22B ... Bearings
23 …… Shaft,
23A …… Rotation stopper,
24 …… Stator,
24A ... Iron core,
24B …… Winding,
25 …… Cup-shaped member,
26 …… Rotor yoke,
27 …… Magnet,
30 …… Fan,
40 ... casing,
50 ... Impeller,
60 …… First jig,
60A ... hole,
60Q …… Step surface,
70 …… Second jig,
70P …… Protrusions,
80 …… hole,
90 …… Balance groove.

Claims (2)

A manufacturing method for manufacturing an impeller of a molded resin integrally formed by surrounding a cylindrical rotor yoke from one end side,
An insertion step of inserting a shaft so that one end protrudes from the jig into a hole formed on the central axis of the jig;
A fitting step in which the protrusion of the jig is brought into contact with the other end surface of the rotor yoke, and the rotor yoke is fitted to the peripheral side surface of the jig so that the rotor yoke is lifted and disposed;
A mold step of forming an impeller in which the rotor yoke is molded by filling a mold resin with a mold, and
A manufacturing method for manufacturing an impeller before fixing a magnet in which a hole exposing a part of the other end surface of the rotor yoke is formed in a mold resin covering the other end surface of the rotor yoke. The jig is
A first jig in which the hole is formed on the central axis and a step surface having a through hole is formed on the other end side of the peripheral side surface to which the rotor yoke is fitted;
The other end of the first jig is disposed, the other end of the shaft abuts, and the first jig
A second jig formed with the projections protruding from the step surface through the through-hole of the jig;
The manufacturing method according to claim 1, comprising:

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