JPH0239176B2 - MOORUDOMOOTANOSEIZOHOHO - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a method for manufacturing a molded motor, and particularly aims to provide a molded motor with stable quality for motors in which the stator core is divided into a plurality of parts. It is something.

2. Description of the Related Art Molded motors are well known in which a stator of a small electric motor is molded with thermosetting synthetic resin and integrally formed with a frame or one of the brackets.

Generally, in the molding of the above-mentioned molded motor, the undivided stator core with the finished winding, which is the object to be molded, is placed in the cavity of the mold, and after the mold is clamped, the injection molded in advance is placed in the mold. Pressure is applied to the molding resin and the resin is injected in a fluid state through the molding gate.

In this case, the number and position of gates depend on the shape of the molded part,
It varies depending on the size, number of pieces per mold, etc., but basically the stator core will not be affected by it no matter where it is installed.

This is because the core has an annular shape and is clamped in the stacking direction of the core pieces by an appropriate method such as welding or riveting.

However, when molding a core divided into multiple parts in the radial direction due to reasons such as winding, there is a method of mechanically joining the joined parts of the divided core with windings, such as by welding, to form an annular shape. is necessary. This is to prevent mold resin from entering the joint surfaces of the split cores, which would create gaps in the joint surfaces of the cores, increasing magnetic resistance and significantly degrading the performance of the motor.

Problems to be Solved by the Invention However, it is clear that methods such as welding are not steps that can be taken after winding has been completed, and can seriously impair the properties and reliability of the product, such as damaging the wire.

In addition, as another main stage, it is possible to provide unevenness that interlocks with each other on the dividing surface of the core, but this is not suitable for small motors with small core dimensions.
In addition, this method is unfavorable in terms of characteristics because it always creates a gap in the occlusal area.

The present invention has been made in view of the above-mentioned drawbacks, and has excellent quality and performance, in which the iron core is divided and toroidal winding is applied, and the divided iron core can be molded without the need for a main stage of forced coupling. A method for manufacturing a molded motor is provided.

Means for Solving the Problems In order to achieve this object, the present invention provides a method in which, after applying toroidal winding to a plurality of segmented cores having arc-shaped outer peripheries in which core pieces are laminated, the arc of each segmented core is Each divided core is placed in contact with the cavity of a mold for resin molding so as to be located on the same circumference to form an annular stator core shape, and a synthetic resin is injected into the cavity. A method for manufacturing a molded motor in which each split core and a winding are integrally molded and solidified, wherein when injecting the synthetic resin, the split cores are line-symmetrical to the split plane in which they abut each other,
and a resin injection molding plate provided in the mold at a point symmetrical position with respect to the center point of the ring formed by the split core, and at a position corresponding to the center of the core pieces of the split core in the stacking direction. The synthetic resin is injected into the cavity of the mold through the gate.

Function: When synthetic resin is injected from the resin injection gate at the above-mentioned predetermined position of the mold, a force is applied to each split core toward the center of the ring of the annular stator core. An annular stator core can be formed by contacting the stator core.

The details of the present invention will be explained below by taking as an example a case in which a stator is molded in which a toroidal winding is applied to each slot of a divided core.

FIG. 1 is a sectional view of the molded state taken along a diameter perpendicular to the dividing plane of the core, and FIG. 2 is a sectional view taken along line X-X' in FIG.

In FIG. 1, a split core 4 having a toroidal winding 8 is set together with a core 3 in a cavity 2' provided in a lower mold 2 in an annular manner, and is sealed by an upper mold 1.

Here, the center core 3 is provided with a key 7 in the axial direction as shown in FIG. 2, and the slot opening 9 of the split core 4 is fitted into this key 7, so that the joint surfaces of the respective split cores are separated from each other to the left and right. It prevents things from happening. The gate 5, which is a resin injection port, is located at the center of the core pieces of the split core in the stacking direction li, and
They are provided at two locations facing each other on a diameter substantially perpendicular to the splitting plane (that is, at positions line-symmetrical to the splitting plane and point-symmetrical to the center point of the ring formed by the splitting core).

In this state, when the molding resin 6 is made fluid under high pressure and injected through the gate 5, the resin 6 flows as shown by the arrows in FIGS. The resin 6 is filled into the cavity 2' while applying a force in the direction of pressing the resin 6.
When the resin 6 has flowed to the point where it covers the joint surface 4', other parts are already covered with resin, so the joint surfaces are not pushed apart by the force of the resin, so the joint surfaces are in close contact with each other. It becomes possible to mold with.

Further, as shown in FIG. 3, a plurality of gates may be provided for one divided core.

Effects of the Invention As described above, when molding is performed by the method of the present invention, the gap between the joining surfaces does not increase when the core is divided, and therefore the magnetic field due to the division of the core does not increase. It is possible to minimize loss. This eliminates the need to weld the joint surface after winding the wire, so there are no quality or reliability problems such as damage to the winding, and there is no need to place special equipment such as a welding machine during the manufacturing process. An excellent method for manufacturing a molded motor can be provided.

[Brief explanation of drawings]

Fig. 1 is a vertical cross-sectional view taken at a diameter perpendicular to the dividing plane of the divided core, when a toroidal winding is applied to a divided core divided into two parts, which is installed in the cavity of a molding die and molded. , FIG. 2 is a sectional view taken along line X-X' in FIG. 1, and FIG. 3 is an explanatory view showing another embodiment of the present invention. 1... Upper mold, 2... Lower mold, 3... Middle core, 4
...Stator, 5...Gate, 6...Resin.

Claims (1)

[Claims] 1. After toroidal winding is applied to a plurality of split cores each having an arc-shaped outer periphery made by laminating core pieces, the core pieces are placed in the cavity of a mold for resin molding so that the arcs of each split core are located on the same circumference. The divided cores are placed in contact with each other to form an annular stator core shape.
A method for manufacturing a molded motor in which a synthetic resin is injected into the cavity and each split core and winding are integrally molded and solidified, wherein the split cores are in contact with each other when injecting the synthetic resin. a position of the mold that is line symmetrical to the dividing plane, point symmetrical to the center point of the ring formed by the divided core, and corresponding to the center of the core pieces of the divided core in the stacking direction; A method for manufacturing a mold motor, in which the synthetic resin is injected into a cavity of a mold through a resin injection gate provided in the mold.