JPH08149737A - Stator for motor and manufacture thereof - Google Patents

Abstract

PURPOSE: To make thin the stator for a motor without altering the fixing dimensions of the motor by pressure holding the lead wire clamping part, composed of a protruding component, by means of a die and then resin molding that part thereby limiting the winding height of the stator core. CONSTITUTION: The stator core 1 has slots 3 and the end face insulated by a thin film molded integrally of an electric insulating resin 2. A lead holding part 4 and a lead stopper 5 for clamping the lead wire 4 integrally after cutting are formed of the electric insulating resin 2 on the radial outside of the outer diameter of stator core. Furthermore, protrusions 6 formed of the electric insulating resin 2 having predetermined dimensions are projecting from the outer diameter of the stator core. The stator core, the winding, and the like are then integrally molded of the electric insulating resin thus forming a stator part. Since the stator can be molded with reduced stator height, the motor can be made thin easily.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator for an industrial electric motor in which a stator core insulation is integrally molded with resin and a stator frame is formed by resin molding together with windings.

[0002]

2. Description of the Related Art In a conventional stator, a thin film insulator is inserted as a slot insulation from a stator core end into a slot to wind a winding. At this time, the thin film insulator is set to a length of 2 to 3 mm on one side with respect to the laminated length of the stator core to secure an insulation space distance between the stator core and the winding. In addition, folds are provided to prevent thin film insulation from moving within the slot. The winding is wound a predetermined number of times with a winding frame in advance and is inserted from the stacking direction of the stator core and unrolled.
After fixing the winding temporarily, it is bound with a binding thread, then subjected to secondary shaping, varnished, and fixed to complete the stator core and winding. Thereafter, the finished product of the stator core and the winding is fixed to a metal frame by a method such as press fitting, or integrally molded with an insulating resin to form a stator.

Although there is a demand for downsizing and space saving of an electric motor in an industrial electric motor, it is necessary to reduce the thickness of the electric motor in order to downsize the electric motor without changing the current mounting dimensions of the electric motor.

The stator of the conventional induction motor will be described below.

[0005]

As shown in FIG. 5, as the in-slot insulation of the stator core 1, a winding 7 having a thin film insulator 12 inserted in the slot and wound in advance a predetermined number of times by a winding frame is used. The stator core is inserted in the stacking direction, and is molded and fixed to have a predetermined size by a wedge, a binding thread, a varnish, etc., which are simultaneously inserted. Later, the stator core and the winding portion are integrally molded with resin 11 to form a stator.

However, in the above-mentioned conventional structure, the insulating ring 13 as shown in FIG. 6 is provided as a measure to prevent the winding from being deformed by the resin pressure during resin molding and reaching the resin frame surface to be exposed. Parts are required, which causes the cost to rise along with the mounting cost.

Further, as shown in FIG. 7, a folded-back portion 13 is provided at the end face of the stator core to secure a space distance between the winding and the stator core, and the thin film insulator 11 is fixed in the stator core slot. It prevents the child core from moving in the stacking direction. However, the folded-back dimension is usually about 2 to 3 mm, which occupies a considerable dimension of the winding from the end face of the stator core, and the winding height increases.

[0008]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art by forming a thin film integrally with the stator core on the stator core slots and end faces with an insulating resin to form an insulating layer, At this time, projecting structural parts are formed at the same time in radial positions protruding from the outer diameter of the stator core, the winding is inserted and the winding height is made low, and then the lead wire is connected to the projecting structural parts. Fit the lead wire on one side and set the protruding structure formed on the opposite side so that it is sandwiched from the top of the lead wire and fix the lead wire. After that, the stator iron core, windings, etc. are integrally formed of insulating resin to form the stator portion. In order to withstand the resin molding pressure at this time, the lead wire sandwiched portion formed by the projecting structural parts is pressed and held by the mold to perform resin molding.

[0009]

With this structure, the resin on the end face of the stator core is formed, and the folding of the thin film insulating paper, which has been conventionally required, can be formed together with the inside so that the winding height is low.

Since the winding height can be formed low, the winding does not move due to the resin pressure when the stator core and the winding are integrally formed by resin. At the same time, the insulating ring for winding is not required.

[0011]

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

In FIG. 1, reference numeral 1 denotes a stator core, and a stator core slot 3 and an end face are insulated with a thin film by an electrically insulating resin 2 which is integrally molded with the stator core.

At the same time, the lead wire holding portion 4 is formed at a radial position protruding from the outer diameter of the stator core by the electrically insulating resin 2 and the lead retainer 5 is integrally formed with the lead wire holding portion 4 after cutting so as to sandwich the lead wire. Has been done.

Further, a protruding portion 6 is formed at the tip end portion of the electrically insulating resin 2 at a radial position protruding from the outer diameter of the stator core and further having a protrusion of a predetermined size.

Later, as shown in FIG. 2, the winding 7 is inserted and the wedge 8 is inserted at the same time. After the winding is temporarily formed, the winding is fixed with a binding thread 9, and the lead wire 10 connected to the winding is inserted into the lead wire holding portion 4 and sandwiched by the lead retainer 5 to fix the winding by varnishing. . Finally, the stator core, windings, and the like are integrally molded with the resin 11 shown in FIG. 3 by the electrically insulating resin to form the stator portion. FIG. 4 shows an example in which a binding thread is wound around the winding, the outer surface of the stator core, and the stator core slot portion, and shows a configuration in which the winding height can be further reduced.

[0016]

As described above, according to the present invention, since the winding height is low, the rigidity of the winding becomes strong against the resin pressure at the time of molding later, the movement of the winding is eliminated, and the insulating ring is formed. Is unnecessary, and the thinning of the electric motor can be easily achieved. Further, the lead wire sandwiching component can be simultaneously formed by the insulating resin of the stator core.

The projecting parts that are molded at the same time as the stator core insulation are formed at radial positions outside the outer diameter of the stator core, and the resin flow during resin molding is good, and the position is also good for winding work. Winding work can be performed without any problems. Further, since the positioning protrusion is formed for the resin molding after the winding work, a highly accurate electric motor stator can be realized.

[Brief description of drawings]

FIG. 1 is a perspective view showing completed stator core insulation of an electric motor according to an embodiment of the present invention.

FIG. 2 is a perspective view showing the stator winding of the electric motor in one embodiment of the present invention.

FIG. 3 is a perspective view of a completed stator of an electric motor according to an embodiment of the present invention.

FIG. 4 is a perspective view showing a completed stator winding of an electric motor according to another embodiment of the present invention.

FIG. 5 is a partial sectional view of a stator of a conventional electric motor.

FIG. 6 is a sectional view of a conventional electric motor.

FIG. 7 is a partial cross-sectional view of an electric motor showing a conventional example.

[Explanation of symbols]

 1 Stator Iron Core 2 Electrical Insulating Resin 3 Stator Iron Slot Slot Part 4 Lead Wire Holding Part 5 Lead Retainer 6 Positioning Protrusion Part 7 Winding 8 Wedge 9 Binding Thread 10 Lead Wire 11 Stator Molding Electrical Insulating Resin 12 Thin film insulating paper 13 Insulation ring

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroshi Kitamura 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (5)

[Claims] Claim: What is claimed is: 1. Insulation of the stator core slot portion and the stator core end face portion is integrally molded with the stator core by an electrically insulating resin, and the winding is inserted in the stator core laminating direction to shape the winding end. And a binding thread and / or a varnish, and then the stator core and windings are further molded with an electrically insulating resin to form a stator, which is one or both of the stator end face side of the stator core insulation. , One or more projecting structures are formed at a radial position outside the outer diameter of the stator core with an electrically insulating resin, and the winding height is made lower than a specified value and wound with a binding thread and / or varnish. A stator of an electric motor that is fixed and molded with an electrically insulating resin. 2. At least two projecting structure portions formed on one or both of the end surface sides of the stator core so as to face the stator core outer diameter radial position have a pair of functions, and at least one projecting structure. The stator of an electric motor according to claim 1, wherein the structural portion is separated after resin molding and is used as a pair of component parts having a specific function together with the other protruding structural portion. 3. The stator of an electric motor according to claim 1, wherein a binding thread is wound around the stator core slot, the winding, and the outer circumference of the stator core to fix the stator winding. 4. A stator core having at least two projecting structures formed on one or both of the end faces of the stator core at radial outer positions of the stator core and having a predetermined size so as to project in the stator core stacking direction. A method for manufacturing a stator of an electric motor, wherein the protrusion-shaped structure portion is positioned when resin molding is performed after winding. 5. At least two of the projecting structure portions formed at the stator core outer diameter radial position on one or both of the end face sides of the stator core have a pair of functions, and at least one protrusion is formed after resin molding. A method of manufacturing a stator of an electric motor, which is used as a resin-sealed component when the resin is molded after winding by sandwiching a lead wire of a winding that is separated and separated as a pair of components.