JP2001324353A - Method and structure for protecting coil in resolver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To protect a coil arranged in an annular stator core in a single process by forming a resin layer by resin molding without applying any varnishing treatment to the coil. SOLUTION: In this method and its structure for protecting coil in a resolver, resin molding is applied to the coil 5 arranged in the annular stator core 1 through insulating covers 2, 3 without any varnishing treatment, and the outside face of the coil 5 is covered with the resin layer 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a structure for protecting a winding of a resolver. And new improvements to obtain reduced materials and improved reliability.

[0002]

2. Description of the Related Art Conventionally, a winding protection method and structure of this type of resolver of this type include those shown in FIGS. That is, in the case of the first potting method shown in FIGS. 3 and 4, insulating covers 2 and 3 are provided on each end face of the annular stator core 1, and each of the slots 4 is wound many times through the insulating covers 2 and 3. Winding 5 is provided. After the varnish impregnation process is performed on the winding 5, a resin film 6 having a thickness of several millimeters is formed on the outer surface of the winding 5 by potting resin, and the winding 5 is fixed.

In the case of the second potting method shown in FIGS. 5 and 6, the first potting method shown in FIGS.
Since the structure is the same as that of the conventional potting method, the same portions are denoted by the same reference numerals and description thereof will be omitted. However, the different portions have a sufficient thickness so that the resin film 6 covers not only the outer surface but also the slot portions. Has been processed by.

Next, in the case of the third conventional protective cover system shown in FIGS. 7 and 8, insulating covers 2 and 3 are provided on each end face of the annular stator core 1, and each slot is inserted through the insulating covers 2 and 3. 4 is provided with a winding 5 wound many times.
After the varnish impregnation process, the winding 5 is covered with a resin cover 10 for covering the insulating covers 2 and 3 and the winding 5.
Are mounted on both end faces of the ring-shaped stator 1, and the resin cover 10 completely covers the winding 5 and the entire resin covers 2 and 3.

[0005]

Since the conventional method and structure for protecting a winding of a resolver have been constructed as described above, the following problems exist. That is, in the conventional configuration shown in FIGS. 3 to 6, since the winding is subjected to varnish impregnation after being subjected to potting with a resin, the number of processing steps is large, and a great deal of labor and materials are used. In the impregnation process, preheating, impregnation, and main drying are performed, so that it takes time, and it is difficult to improve production efficiency. In addition, in the case of the conventional method shown in FIGS. 7 and 8, it is difficult to achieve cost reduction because production and mounting of a resin cover are required in addition to the above-described varnish impregnation step of the winding.

The present invention has been made to solve the above problems, and in particular, by directly fixing a winding to a ring-shaped stator by resin molding without subjecting the winding to varnish impregnation, It is an object of the present invention to provide a method and a structure for protecting a winding of a resolver in which steps and materials are reduced and reliability is improved.

[0007]

A method of protecting a winding of a resolver according to the present invention comprises applying a resin mold to a winding provided on a ring-shaped stator core via an insulating cover without performing a varnish impregnation treatment. A method in which the outer surface of the winding is covered with a resin layer, a method in which a resin has penetrated into the inside of the winding, and the winding protection structure of the resolver according to the present invention is integrated with the annular stator core or In a resolver having a winding provided via a separate insulating cover, at least an outer surface of the winding is formed with a resin layer by resin molding, and the winding is subjected to a varnish impregnation treatment. And the resin has penetrated into the winding.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the method and structure for protecting a winding of a resolver according to the present invention will be described below with reference to the drawings. Note that the same or equivalent parts as those in the conventional example will be described using the same reference numerals. In FIG. 1 and FIG. 2, a reference numeral 1 denotes a ring-shaped stator core formed by laminating the whole shape in a ring shape. A pair of insulating covers 2 and 3 are provided on both end surfaces of the ring-shaped stator core 1. . The insulating covers 2 and 3 may be separately provided as shown in the figure, or may be integrated.

On the outer surfaces of the insulating covers 2 and 3, there are provided windings 5 wound many times so as to be located in the respective slots 4. Next, the annular stator core 1 in a state in which the winding is completed as described above is loaded into a molding die (not shown), and in this loaded state, a molten resin is injected into the die from an injection molding machine. A resin is supplied to the outer surface of the winding 5 and the slot 4 to form a resin layer 20. Therefore, the resin layer 20 is formed on the outer surface of the winding 5 by resin molding, and the resin enters the winding 5 and is integrated.

When the above-described resin molding is completed, the mold is opened after the resin is cooled, thereby obtaining the annular stator core 1 for a resolver in which the resin layer 20 is molded. Therefore, by forming the ring-shaped stator 1 by the resin mold described above, the winding 5 does not need to be subjected to a pre-consolidation treatment by a varnish impregnation treatment as in the related art, and the winding 5 is completely protected only by the resin mold. be able to.

[0011]

The method and structure for protecting a winding of a resolver according to the present invention are configured as described above, and the following effects can be obtained. That is, since a resin layer is formed by a resin mold on the outer surface of the winding wound around the annular stator core via the insulating cover, the conventional varnish impregnation process and the potting process that require time and cost are not required, The winding protection can be completed by one-step molding. In addition, the surface of the resin layer is mirror-finished by the resin mold and firmly fixed to the insulating cover side, and at the same time, the resin can enter the gap in the wound winding, and the winding is simultaneously fixed. As a result, productivity can be improved and reliability can be ensured.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a winding protection structure of a resolver according to the present invention.

FIG. 2 is an enlarged view showing a main part of FIG. 1;

FIG. 3 is a cross-sectional view illustrating a conventional winding protection structure of a resolver.

FIG. 4 is an enlarged view showing a main part of FIG. 3;

FIG. 5 is a sectional view showing another conventional structure.

FIG. 6 is an enlarged view showing a main part of FIG. 5;

FIG. 7 is a sectional view showing another conventional structure.

FIG. 8 is an enlarged view showing a main part of FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ring-shaped stator core 2, 3 Insulation cover 5 Winding 20 Resin layer

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2F077 AA41 AA43 AA46 FF13 FF34 VV09 VV11 VV33 5H604 AA08 CC01 CC05 CC13 DB01 DB26 PB03 5H615 AA01 PP01 PP06 PP12 QQ02 QQ19 RR02 SS05 SS11 SS13 SS44

Claims (4)

[Claims] An insulating cover (2, 3) is attached to a ring-shaped stator core (1).
A resolver characterized in that a resin mold is applied to the winding (5) provided through the varnish without performing varnish impregnation treatment, and at least an outer surface of the winding (5) is covered with a resin layer (20). Winding protection method. 2. The method for protecting a winding of a resolver according to claim 1, wherein a resin has entered the inside of the winding (5). 3. A resolver having a winding (5) provided integrally with or separate from an annular stator core (1) via an insulating cover (2, 3), wherein at least an outer surface of the winding (5) is provided. A winding protection structure for a resolver, wherein a resin layer (20) is formed by a resin mold. 4. The winding (5) is not subjected to a varnish impregnation treatment, and has a structure in which the resin penetrates into the winding (5). Resolver winding protection structure.