JPH04114751U - Electric motor - Google Patents

Abstract

(57) [Summary] [Purpose] The iron core of the electric motor does not rust, and
The structure of the molding die is simple, workability is good, and the rotor and iron core can be reliably grounded. [Configuration] A stator 4 made of resin molded into an iron core wrapped with windings, and a rotor 5 installed inside the stator 4.
In an electric motor consisting of a bracket 6 that supports the rotor 5, and a terminal plate 7 that leads to power, a joint part that joins the ground terminal 8 to the iron core, and a terminal part 802 that joins the bracket 6.
The ground terminal 8 is provided on the terminal plate 7, and the terminal portion 802 of the ground terminal 8 and the bracket terminal 601 of the bracket 6 are joined.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is a molded motor in which an iron core wrapped with windings is molded with synthetic resin. It relates to an electric motor called.

0002

[Conventional technology]

Hereinafter, a conventional electric motor, that is, a molded motor will be described as an example. Figure 5 is an overall perspective view of a conventional molded motor, and Figure 6 is a portion of the molded motor. The cross-sectional view, Figure 7, shows the iron core around which the windings are wound, before it is molded with synthetic resin. FIG.

0003 In the figure, 1 is a molded motor, and this molded motor 1 has a winding 2 wound around it. The stator 4 is molded with synthetic resin on the iron core 3, and the stator 4 is A rotatable rotor 5 installed inside and a bracket 6 that supports the rotor 5 and a terminal board 7 that leads the power to the motor.

0004 Iron core 3 is made of laminated iron plates, with some parts exposed from the surface of the molded resin. In order to keep this exposed iron core 3 and rotor 5 at the same potential, the iron core 3 and the bracket are connected. Ground terminal 8 made of conductive paint or adhesive tape between terminal 6 and terminal 6. ing.

[0005] In addition, if this grounding is not available, there will be a potential difference between the rotor 5 and the iron core 3 during a pressure test, etc. If this happens, sparks will occur in the air gap 9 between the rotor 5 and the iron core 3. This generates strong electromagnetic noise, which can cause malfunction of electronic equipment around the motor. become.

[0006] A terminal plate 7 is provided on the outer side of the stator 4. Figure 8 shows how to attach the terminal plate to the FIG. 9 is a partial cross-sectional view of the terminal board attached to the terminal board, and FIG. 9 shows a front view of the terminal board. The terminal board 7 has three terminal board main bodies 701 molded from an insulating material such as resin. Power terminals 702 are embedded, and one end of these power terminals 702 is connected to the terminal board body. 701 and is connected to the winding 2, and the other end of the power terminal 702 is connected to the terminal board body 701. It protrudes into three cubic blind holes 703 formed in the.

[0007] Note that a plate-shaped joint portion 704 is integrally formed with the main body 701 and protrudes from the center of the lower part of the terminal board main body 701. It is formed by putting it out. A dovetail groove 10 is formed on the side of the iron core 3 in the thickness direction of the iron core 3, and the above-mentioned dovetail groove 10 is formed in the side part of the iron core 3 in the thickness direction of the iron core 3. By inserting the joint portion 704 of the terminal plate 7, the terminal plate 7 is prevented from coming off from the iron core 3. It is installed in such a way that it looks like it should.

[0008]

[Problem that the idea aims to solve]

However, in the conventional configuration, the iron core is exposed from the surface of the molded resin. This may cause the iron core to rust or complicate the structure of the molding die. There was a problem.

[0009] In addition, the work of applying and pasting conductive paint or adhesive tape for grounding is required. However, there was a problem in that productivity was not improved. Furthermore, due to the quality of the paint and tape peeling off or breaking, it is difficult to connect to the ground. It had the following problems.

0010 This invention was made to solve the above-mentioned conventional problems, and the iron core rusts. In addition, the mold structure is simple, workability is good, and the rotor can be reliably removed. The purpose is to provide an electric motor that can ground the iron core.

[0011]

[Means to solve the problem]

In order to achieve the above-mentioned problems, the electric motor of the present invention has an iron core wrapped with windings made of resin. A molded stator, a rotor installed inside the stator, and a rotor support. In an electric motor that consists of a bracket that connects the stator and a terminal board that leads to the power, Connect one end of the ground terminal to the iron core and bury it, and connect the other end of the ground terminal to the bracket. conducts.

0012 In addition, there is a joint at one end where the ground terminal is joined to the iron core, and a joint at one end where the ground terminal is joined to the iron core. This ground terminal is provided on the terminal board, and the ground terminal is The terminal part of the bracket is connected to the bracket terminal of the bracket.

[0013]

[Effect]

By configuring the present invention as described above, when the electric motor is assembled, it automatically A ground connection can be established between the stator core and the rotor.

[0014]

【Example】

FIG. 1 is an overall perspective view showing one embodiment of the electric motor of the present invention, and FIG. 2 is a model of the stator. FIG. 3 is a perspective view before molding.

[0015] The electric motor 1 of the present invention and the conventional electric motor are molded with synthetic resin. stator 4, dovetail grooves 10 formed in stator 4, and even the inside of stator 4. Since the structure of the rotor 5 which is rotatably supported by the rotor 5 is the same, the details will be omitted.

[0016] Therefore, first, the electric motor 1 of the present invention and the conventional electric motor 1 are connected to different terminal plates 7. explain about. Figure 3 is a partial cross-sectional view of the terminal plate attached to the stator, and Figure 4 is a partial cross-sectional view of the terminal plate attached to the stator. A front view is shown.

[0017] As shown in FIG. 2, the terminal board 7 has a terminal board main body 701 molded from synthetic resin. One side is thicker than the other, and there are three power terminals on this side. 702 is embedded. Note that the embedded structure of this power supply terminal 702 is different from the conventional one described above. It is similar to the molded motor.

[0018] A ground terminal 8 is attached to the other side of the terminal board main body 701. this earth The terminal 8 is a plate with elasticity, the center is bent in a stepped manner, and one end from the center has a stay. At the joint 801 inserted into the dovetail groove 10 of the iron core 3, the other end is joined to the bracket 6. It is a terminal section 802.

[0019] Six sawtooth-shaped protrusions 803 are formed on both sides of the joint 801. 803 improves the bondability with the iron core 3. In addition, the tip of the terminal section 802 is bent into a dogleg shape to give it spring properties, and the bracket of bracket 6 This improves the bondability with the terminal 601.

[0020] The bracket terminal 601 has a plate that protrudes radially outward from the outer peripheral edge of the bracket 6. The tip of this protruding plate is bent into an L-shape. child The inside of the tip bent into an L shape is connected to the terminal portion 802 of the ground terminal 8. The iron core 3 and the bracket 6 are configured to be electrically connected to each other.

[0021] In this way, the joint part 801 of the ground terminal 8 is press-fitted into the dovetail groove 10 of the iron core 3, and the terminal plate 7 is attached to the iron core 3 and molded to produce the stator 4. Insert the rotor 5 into the inside of the motor, support the rotor 5 with the bracket 6, and By assembling machine 1, the ground between rotor 5 and stator core 3 is established. It will be.

[0022] By providing the ground terminal 8 on the terminal plate 7 as described above, the stator core 3 and the terminal plate 7 are connected to each other. Since the racket 6 is electrically conductive through the ground terminal 8, the iron core is 3 and apply conductive bond or tape between the bracket 6 and the iron core 3. Since there is no need to paste the Therefore, it is possible to reliably ground between the iron core 3 and the rotor 5. Wear.

[0023] In the above embodiment, an example in which the ground terminal 8 was attached to the terminal plate 7 was explained. This idea does not necessarily require that the ground terminal 8 be attached to the terminal board 7; The ground terminal 8 is buried in the ground terminal 4 with only the joint 801 connected to the iron core 3, and the ground terminal The terminal portion 802 of No. 8 may be electrically connected to the bracket terminal 601.

[0024]

[Effect of the idea]

With the above configuration, the present invention prevents the iron core from being exposed and rusting, and can be molded. can also be done easily. Moreover, when the electric motor is assembled, the gap between the iron core and the rotor is automatically Since it is possible to ground the go up Furthermore, since there is no risk of the ground terminal breaking, the connection between the iron core and rotor is It is possible to reliably ground the space between the two.

[Brief explanation of drawings]

[Fig. 1] Overall perspective view showing one embodiment of the electric motor of the present invention

[Figure 2] A perspective view of the stator of the electric motor of the present invention before molding

[Figure 3] Partial cross-sectional view of the electric motor of the present invention

[Figure 4] Front view of the terminal board used in the electric motor of the present invention

[Fig. 5] Overall perspective view showing an example of a conventional electric motor

[Figure 6] Partial cross-sectional view of a conventional electric motor

[Figure 7] Perspective view of the stator of a conventional electric motor before molding

[Figure 8] Partial sectional view of a conventional electric motor

[Figure 9] Front view of a terminal board used in a conventional electric motor

[Explanation of symbols]

1 Electric motor 2 winding 3 Iron core 4 Stator 5 Rotor 6 Bracket 7 Terminal board 8 Earth terminal 801 Joint 802 Terminal section

Claims (2)

[Scope of utility model registration request] [Claim 1] A stator in which an iron core around which a winding is wound is molded with resin, a rotor installed inside the stator,
An electric motor consisting of a bracket that supports the rotor and a terminal board that leads to power, in which one end of the ground terminal is buried in the stator so that it is electrically connected to the iron core, and the other end of the ground terminal is electrically connected to the bracket. [Claim 2] The ground terminal is composed of a joint part on one end side that is joined to the iron core, and a terminal part on the other end side that is joined to the bracket, and this earth terminal is provided on a terminal board, and the terminal part of the earth terminal is 2. The electric motor according to claim 1, wherein the and the bracket terminals of the bracket are connected to each other.