JP2556075Y2 - Electric motor device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor device in which an insulating member made of synthetic resin covering at least a part of a stator core has a protruding portion rising from the stator core.

[0002]

2. Description of the Related Art In a motor device such as a fan motor, a necessary portion of a stator core is often covered with an insulating member made of a synthetic resin in order to mainly electrically insulate the windings from each other. Done. FIG.
FIG. 3 is a cross-sectional view of a stator core a to which insulating members b and c divided into two in an axial direction are mounted.

In such a case, the stator core a
Is provided, and the protrusion d
In some cases, for example, a process is performed in which a holding hole e is provided to insert and hold a metal pin f for entanglement of a lead portion of a winding and soldering.

However, the synthetic resin insulating member b
However, when the insulating member b is attached to the stator core a, if the insulating member b is attached to the stator core a, the protrusion d may be, for example, as indicated by an arrow as shown in FIG. May be bent inward as shown. Then, for example, the direction of the holding hole e provided in the projection d is also inclined from the expected direction, and it is extremely difficult to insert the pin f into the holding hole e by an automatic machine. . Such inconvenience may also occur in other processes for the protrusion d.

The present invention has been made in view of the above-mentioned problems in the prior art, and has as its object to provide a synthetic resin insulating member that covers at least a part of a stator core. However, it is an object of the present invention to provide an electric motor device in which a protrusion that rises from a stator core is oriented substantially in a desired direction, and therefore, the processing of the protrusion is easily performed.

[0006]

In order to achieve the above object, in the electric motor device according to the present invention, an insulating member made of synthetic resin covering at least a part of the stator core includes a protrusion and a fitting protrusion.
Having a base portion at a predetermined portion of the insulating member.
Is located and protrudes in the direction of rising from the stator core.
Wherein the fitting protrusion has a base positioned at the predetermined portion.
And projecting in a direction substantially opposite to the projection.
The fitting projection is fitted into an insertion hole provided in the stator core in a direction substantially opposite to the projection.

[0007]

[Function] A predetermined portion of a synthetic resin insulating member is
The base of the protrusion that stands up from the data core is located
And has a base at a predetermined portion thereof, and is substantially opposite to the protrusion.
Fitting projection which protrudes to the orientation, because they are fitted into insertion holes provided in the stator core substantially opposite the protrusion, fitting projection becomes possible to always face the expected direction. for that reason,
The protrusion opposite to the fitting protrusion also maintains the desired direction, or is corrected in the desired direction.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings. 1 to 3 relate to a fan motor as one embodiment of the electric motor device of the present invention, FIG. 1 is a sectional view of a main part thereof, FIG. 2 is a half sectional view of a stator core to which an insulating member is mounted, FIG. 3 is a plan view of the stator core.

Although the fan motor of this embodiment is an outer rotor type brushless motor having a four-pole stator with a slot, it goes without saying that the present invention is not limited to this embodiment.

Reference numeral 10 denotes a four-rotationally symmetric stratified stator core having four slots. Each tooth 10a of the stator core 10
An axial insertion hole 12 is formed in the outer peripheral portion and slightly inward central portion thereof, which is opened on the upper surface in FIGS. 2 and 3.

Reference numeral 14 denotes a first insulating member, and 16 denotes a second insulating member. The first insulating member 14 and the second insulating member 16 are mainly used to electrically insulate the stator winding 18 and the stator core 10 from each other. It is divided into two parts, each of which is fitted and mounted on the stator core 10 from above and below.

The first insulating member 14 is configured such that the upper surface and each side surface of the stator core 10 excluding the outer peripheral surface of the teeth 10a and the outer peripheral surface of the cylindrical core yoke portion 10b are equal to or have the same thickness as one layer constituting the stator core 10. It is covered with a thinner thickness. The reason why the thickness is reduced in this way is to make the volume of the slot portion 20 as large as possible so that a sufficient amount of the winding 18 can be easily wound on each tooth 10a. Reference numeral 14a denotes a first cylindrical portion formed such that a portion covering the outer peripheral surface of the core yoke portion 10b extends upward in FIG. Also on the outer peripheral center portion of the portion covering the upper surface of each tooth 10a in the first insulating member 14 (one example of the predetermined portion of the insulating member), the holding of the transverse section substantially rectangular shape which protrudes axially upward in FIGS. 2 and 3 A projection 22 is provided. Therefore, the holding projection 2
2 is located above each tooth 10 a in the first insulating member 14.
It is located at the center of the outer periphery of the portion that covers the surface. Each of the holding projections 22 has an axial holding hole 24 that is open on the upper surface thereof.
have. Further, a fitting projection 26 having a circular cross section, which is substantially opposite to the holding projection 22, is provided in the outer peripheral portion of the portion covering the upper surface of each tooth 10 a, and slightly inward at the center. The fitting projection 26 is fitted and held in the insertion hole 12 of the stator core 10. Therefore, the base of the fitting projection 26 is
The portion covers the upper surface of each tooth 10a in the first insulating member 14.
The outer part of the part is slightly inward and the center part, that is, the insulating member
Is located slightly inward in a predetermined portion of

Since the first insulating member 14 has a relatively small thickness except for the holding projection 22, the first insulating member 14 lacks rigidity enough to maintain the direction of the holding projection 22 by itself. Since the fitting protrusion 26 facing in the opposite direction to the upper and lower sides of the fitting protrusion 22 is fitted and held in the insertion hole 12 of the stator core 10 and always faces in the desired direction, the holding protrusion 22 also substantially changes in the desired direction. It will be maintained or corrected in approximately the desired direction. Therefore, it is easy to perform the operation of inserting and holding the metal pin 28 for tangling the lead portion 18a of the winding 18 and soldering the same with an automatic insertion machine.

The first insulating member 14 is fixed to the stator core 1 by the fitting projection 26 being fitted and held in the insertion hole 12.
Since the first insulating member 14 is held at 0, the mounting of the first insulating member 14 to the stator core 10 can be maintained without using means such as bonding with an adhesive.

The second insulating member 16 has the same thickness as the first insulating member 14 on the lower surface and each side surface except the outer peripheral surface of the teeth 10a of the stator core 10, and the outer peripheral surface and the upper end surface of the cylindrical core yoke portion 10b. Coated. 16a is
A portion that covers the lower end surface of the core yoke portion 10b in FIG. 2 is a second cylindrical portion formed to extend below the stator core 10. An inwardly extending portion 32 having a J-shaped cross section is provided over the entire circumference at the upper and lower middle portions of the second cylindrical portion 16a.

In FIG. 1, reference numeral 34 denotes a frame. The frame 34 is supported at the center of a fan housing (not shown) via a support bone 36. Frame 34
1 has a deep dish shape with an upper opening in FIG. 1, and a cylindrical bearing housing portion 37 projects upward at the center. A fitting groove 38 is provided in an outer peripheral portion of an upper end of the bearing housing portion 37.

A cylindrical oil-impregnated bearing 40 is fitted and held inside the bearing housing portion 37. Reference numeral 42 denotes a positioning protrusion protruding inward from the bearing housing portion 37, and the lower surface of the positioning protrusion 42 and the upper surface of the oil-impregnated bearing 40 are in contact with each other.

A rotary shaft 44 of the rotor is rotatably supported via the oil bearing 40. A retaining ring 48 is fixed to the tip of the rotating shaft 44 with an annular thrust plate 46 interposed between the rotating shaft 44 and the oil-impregnated bearing 40, thereby preventing the rotating shaft 44 from falling off the oil-impregnated bearing 40. . 50 is
It is a sealing member that seals the lower opening of the bearing housing 37.

On the outer peripheral side of the base of the bearing housing portion 37,
A circuit board 52 is provided with a gap between the frame 34 and the bottom plate 34a. And the bearing housing part 37
The stator core 10 integrated with the first insulating member 14 and the second insulating member 16 is externally fitted and fixed to the outer peripheral portion of the upper and lower intermediate portions from above. After the first insulating member 14 and the second insulating member 16 are attached to the stator core 10, a stator winding 18 is wound around each tooth 10 a, and a drawer 18 a of the stator winding 18 is The base of the pin 28 inserted and held in the holding projection 22 is entangled and soldered. The lower part of the pin 28 in FIG.
After penetrating the circuit board 52, it is soldered to a terminal of the circuit board 52.

The inwardly protruding portion 32 of the second cylindrical portion 16a of the second insulating member 16 is fitted in the fitting groove 38, so that it is integrated with the first insulating member 14 and the second insulating member 16. Is prevented from shifting upward. The downward displacement of the stator core 10 is prevented by the contact between the enlarged diameter portion 54 of the bearing housing portion 37 and the inner peripheral lower end surface of the stator core 10. The lower portion of the inward extension 32 in FIG. 1 is curved, and the outer peripheral portion of the upper end of the bearing housing portion 37 is curved.
Is easily made mainly by the elastic deformation of the inwardly extending portion 32. Since the upper end surface of the inwardly extending portion 32 and the upper surface of the fitting groove 38 which comes into contact therewith are both perpendicular to the axial direction, the stator core 10 is effectively prevented from falling off.

Reference numeral 56 denotes a cup-shaped rotor hub. The rotation shaft 44 projects downward from the center of the rotor hub 56. 58 is a rotor yoke fixed to the inner peripheral portion of the peripheral wall 56a of the rotor hub 56, 60 is a rotor yoke 58
The rotor magnet 60 is opposed to the stator core 10 with a radial gap therebetween. Rotor hub 56
A blade 62 is protruded from an outer peripheral portion of the peripheral wall 56a, thereby constituting an impeller.

Reference numeral 64 denotes an inspection hole penetrating the bottom plate 34a of the frame 34, and reference numeral 66 denotes an inspection terminal provided at a position corresponding to the inspection hole 64 on the lower surface of the circuit board 52. By using the inspection hole 64 and the inspection terminal 66, for example, when a thermistor is incorporated in a motor drive circuit to change the rotation speed of the fan motor in accordance with a temperature change, a resistance corresponding to a constant temperature is changed. The terminal 68a of the resistor 68 or the terminal of a variable resistor capable of responding to a temperature change is brought into contact with the inspection terminal 66 on the circuit board 52 through the inspection hole 64 to thereby provide the rotational characteristics of the completed fan motor. And malfunctions can be checked very easily.

[0023]

According to the electric motor device of the present invention, since the fitting projection is fitted into the insertion hole, the projection opposite to the fitting projection also maintains the expected direction. It is corrected in almost the expected direction. Therefore, processing on the projection, such as automatically inserting a pin into a holding hole provided in the projection, can be easily performed.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a fan motor.

FIG. 2 is a half sectional view of a stator core.

FIG. 3 is a plan view of a stator core.

FIG. 4 is a half sectional view of a conventional stator core.

[Description of sign]

 Reference Signs List 10 Stator core 12 Insertion hole 14 First insulating member 16 Second insulating member 22 Holding projection 26 Fitting projection

Claims (1)

(57) [Scope of request for utility model registration] An insulating member made of synthetic resin that covers at least a part of a stator core has a protrusion and a fitting protrusion, and the protrusion has a base located at a predetermined portion of the insulating member.
And project from the stator core
The fitting projection has a base located at the predetermined portion,
An electric motor device which projects in a direction substantially opposite to the raised portion, and wherein the fitting projection is fitted into an insertion hole provided in the stator core in a direction substantially opposite to the projection.