JP3147495B2 - Resin mold motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low-noise, low-vibration resin-molded motor in which a bearing is supported by a bracket.

[0002]

2. Description of the Related Art In recent years, resin-molded electric motors have been widely used in various home appliances such as air conditioners, oil fan heaters, and air cleaners in response to demands for downsizing and low noise motors.

[0003] Conventionally, this type of resin-molded electric motor has a high accuracy, reliability, cost, and fixing method for the bracket.
Various methods are used in terms of workability and the like.

[0004] A conventional resin mold motor will be described below. As shown in FIGS. 3 and 4, the stator 1 is wound around a stator core, and is integrally molded and fixed with a main body molding resin 2. The rotor 4 facing the stator 1 is fixed to a shaft 5, and is rotatably supported by brackets 3 and 9 via bearings 6. One of the brackets 9 is integrally molded and fixed by the main body molding resin 2. In the other bracket 3, the spigot portion 3a of the bracket 3 is formed in the main mold resin 2 by the bracket spigot portion 2c formed in the main mold resin 2 so that the air gap accuracy between the stator 1 and the rotor 4 is improved. And is fixed to the main body mold resin 2 by a plurality of screws 7 and nuts 8 with a bracket fixing screw portion.

[0005]

However, in the above-mentioned conventional construction, the bracket fixing screw portion and the bracket spigot portion 2c are separated from each other, so that the spigot portion 3a of the bracket 3 is not sufficiently fixed, so that the electromagnetic vibration of the electric motor and the bearing are reduced. In order to solve the problem that the bracket 3 vibrates due to the rotational vibration and causes noise, and a method of increasing the thickness of the bracket 3 to solve this problem is considered, the material cost becomes expensive and However, there has been a problem that press working of the bearing portion becomes difficult.

An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide a low-noise, low-vibration resin-molded electric motor without increasing the thickness of a bracket.

[0007]

In order to achieve this object, a resin-molded electric motor according to the present invention abuts on a bracket.
On the stator end face (bracket spigot part)
Forming a convex portion, and attaching the bracket to the mold convex portion.
By pressing and fixing the outer peripheral part to the stator with screws,
A bracket is pressed against the mold projection.

[0008]

In this configuration, an appropriate stress is applied to a portion where the fixing between the bracket and the main body molding resin is insufficient, thereby increasing the rigidity.

[0009]

An embodiment of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2 showing an embodiment of the present invention, the same parts as those of the conventional example are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIGS. 1 and 2, the present embodiment is characterized in that the spigot portion 3a of the bracket 3 indicated by the symbol A of the bracket spigot portion 2c of the main body molding resin 2 is different from the conventional structure described above. That is, a mold convex portion 2b formed by a mold is added to the contact surface.

The bracket fixing screw portion 10 includes a bracket
On the face of the spigot part 2c, radially outward from the mold convex part 2b
Side (outer peripheral portion), and in this embodiment, as shown in FIG.
As described above, since the bracket fixing screw portion 10 is provided at three locations, the mold convex portion 2b is also provided at three locations. The height H of the mold convex portion 2b is about 0.3 mm, and the width W thereof is a dimension of about 2 mm that can sufficiently contact and fix the spigot portion 3a of the bracket 3. The size and number of the mold protrusions 2b may be set according to the shape and size of the bracket 3.

As described above, according to this embodiment, the bracket 3 of the bracket spigot portion 2c of the main body mold resin 2 is provided.
By providing the mold convex portion 2b on each contact surface of the spigot portion 3a, the spigot portion 3 of the bracket 3 is provided.
A moderate stress is applied to a so that it can be sufficiently fixed, and the rigidity can be increased without increasing the thickness of the bracket 3,
It is possible to suppress the vibration of the bracket 3 due to the electromagnetic vibration of the electric motor and the rotational vibration of the bearing which cause noise,
The motor can have low noise and low vibration.

[0014]

As will be apparent from the above description of the embodiment, the present invention has a structure in which a plurality of resin mold protrusions are provided on the surface of the main body mold resin where the bracket spigot portions of the bracket spigot portions abut. Further, it is possible to realize an excellent resin-molded motor having low noise and low vibration without increasing the thickness of the bracket.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing the concept of a resin-molded electric motor according to one embodiment of the present invention.

FIG. 2 is a schematic diagram of a slope of a bracket spigot portion of a main body mold resin of the resin mold type electric motor.

FIG. 3 is an exploded perspective view showing the concept of a conventional resin mold type electric motor.

FIG. 4A is a half-sectional view of the resin-molded electric motor at a bracket fixing screw portion, and FIG. 4B is a half-sectional view of the resin-molded electric motor at a bracket spigot portion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stator 2 Main body molding resin 2b Mold convex part 2c Bracket spigot part 3 Bracket 3a Spigot part 4 Rotor 5 Shaft 6 Bearing

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H02K 5/08 H02K 5/24 H02K 15/12

Claims (2)

(57) [Claims] A stator which is wound with a stator core and integrally molded with resin; a rotor facing the stator;
A bearing rotatably supporting a shaft to which the rotor is fixed,
A resin mold having a bracket for holding the bearing
In the electric motor, the stator abutting on the bracket
A mold convex portion is formed on an end face, and the bracket is
A resin-molded electric motor characterized by being brought into contact with a metal convex portion . 2. An end face of said stator contacting a bracket.
The bracket is fixed to the periphery by screws.
The resin-molded electric motor according to claim 1.