JP2002101591A - Stator for slotless motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stator for a slotless motor which enables suppression of a coil deforming due to heating during the resin molding, enhancement of a coil fixing, and protection of a coil insulating coating. SOLUTION: The stator for a slotless motor is provided with a air-core coil 2 arranged on the inner circumferential face of a stator core 1 without slots. In this stator, an expansible protection layer 5, formed into mesh, cylindrical shape by coating a resin or an adhesive on a fiber body, is adhered and cured after being inserted in such a way that the protection layer 5 covers the inner circumferential face of the coil 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator of a slotless motor in which a coil is disposed on an inner peripheral surface of a stator core having no slot.

[0002]

2. Description of the Related Art As shown in FIG. 4, a conventional stator of a slotless motor has an inner peripheral surface (inner diameter portion) of a stator core 1 having no slots formed by laminating thin electromagnetic steel sheets.
When arranging an air-core coil 2 formed in an arc shape (R shape) along the stator core 1, a resin impregnated with glass fiber or the like is used to secure insulation between the stator core 1 and the coil 2. In order to bond and cure the coil 2 on a possible insulating sheet 3 and to seal the coil 2, a stator S
The resin mold is performed by inserting the mandrel 4 which forms the shape of the inner peripheral surface of the resin. In addition, as shown in FIG. 5, a resin protective layer 7 is further disposed on the inner peripheral surface (inner diameter portion) of the coil 2 and resin molding is performed.

[0003]

However, in such a conventional slotless motor stator,
There were the following problems. (1) When performing resin molding, since there is an air layer that becomes a resin layer after molding between the inner peripheral surface of the coil 2 of the stator S and the mandrel 4, when the stator S is inserted into the mandrel 4, 2 may be damaged or the coil 2 may be deformed to the inner diameter side due to heating during molding. (2) When the resin protective layer 7 is arranged on the inner diameter side of the coil 2, the magnet and the core are compared with the case where the protective layer 7 is not provided because there is a restriction in manufacturing the thickness of the resin material. Since the gap between them is widened, the characteristics of the motor are degraded, and since no molding resin is interposed between the coil 2 and the protective layer 7,
Since the coil 2 is fixed only at the outer diameter part and the side part of the coil 2, the reliability of the coil fixing is reduced. The present invention
In order to solve such a problem, a stator for a slotless motor has been provided which suppresses deformation of a coil due to heating during resin molding, strengthens coil fixing, and strengthens protection of a coil insulating coating. It is intended to do so.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a stator for a slotless motor in which an air-core coil is disposed on the inner peripheral surface of a stator core having no slot. Alternatively, a protective layer formed into a stretchable mesh and having a tubular shape and coated with an adhesive is inserted so as to cover the inner peripheral surface of the coil, and then the adhesive is cured.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a stator of a slotless motor according to an embodiment of the present invention, in which a part of a stator core is cut away. The present invention, as shown in FIG.
After inserting a protective layer 5 formed in a stretchable mesh shape and a tubular shape in which a fibrous body is coated with a resin or an adhesive so as to cover the inner peripheral surface of the coil 2, the adhesive is cured. . The protective layer 5 is formed by inserting a protective net 5a formed in a mesh shape and a tubular shape and capable of expanding and contracting in a radial direction and an axial direction so as to cover the inner diameter surface of the air-core coil 2 and then bonding and curing. You. Therefore, as shown in FIG. 2, by providing an intervening member between the mandrel 4 forming the inner diameter of the stator S and the inner diameter of the coil during resin molding and eliminating the air layer, deformation of the coil 2 due to heating during molding is suppressed. Is done. When the stator S is inserted into the mandrel 4, the insulating coating of the coil 2 can be protected. Next, the coil 2 is fixed not only by the insulating sheet 3 which also serves as insulation from the stator core 1 disposed on the outer diameter side of the conventional coil 2 but also held on the inner diameter side of the coil 2. Is strengthened. Further, FIGS. 3 (a) and 3 (b)
By forming the protection net 5a in a mesh shape and a cylindrical shape as shown in FIG. 5, the molding resin 6 penetrates into the lattice of the protection layer 5, so that the molding resin 6, the protection net 1 and the air-core coil 2 Adhesion is improved. Therefore, by the inclusion of the protective layer 5, an air layer is eliminated by providing an intervening member between the mandrel 4 forming the inner diameter of the stator S and the inner diameter of the coil 2, so that deformation of the coil 2 due to heating during molding can be prevented. Is suppressed. When the stator S is inserted into the mandrel 4, the insulating coating of the coil 2 can be protected. Next, the fixation of the coil 2 is maintained by the inner and outer diameters of the coil 2, so the fixation of the coil 2 is strengthened. Further, by forming the protective layer 5 in a mesh shape and a cylindrical shape, the mold resin 6 penetrates into the lattice of the protective layer 5, so that the adhesion between the mold resin 6, the protective layer 5, and the coil 2 is improved. . Further, the thickness of the protective layer 5 of the present invention is:
Since the thickness is the same as the thickness of the mold resin 6 when the protective layer 5 is not provided, the motor characteristics do not decrease with the addition of the protective layer 5.

[0006]

As described above, according to the present invention, a stretchable mesh formed by applying a resin or an adhesive to the surface of a glass fiber, a fiber capable of being impregnated with a resin or an adhesive, or a metal fiber having an insulating property. After inserting the protective layer, which is shaped like a tube and covering the inside diameter of the air-core coil, it is bonded and cured, thereby suppressing deformation of the coil due to heating during resin molding and strengthening the fixation of the coil. In addition, there is an effect that the protection of the insulating coating of the coil can be enhanced.

[Brief description of the drawings]

FIG. 1 is a perspective view of a stator showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a stator when a mandrel is inserted according to the embodiment of the present invention.

FIG. 3 is a sectional view of a stator showing an embodiment of the present invention,
(A) is an overall view and (b) is a partially enlarged view.

FIG. 4 is a sectional view of a stator (without a protective layer) when a mandrel is inserted, showing the first related art.

FIG. 5 is a cross-sectional view of a stator (with a protective layer) when a mandrel is inserted according to a second conventional technique.

[Explanation of symbols]

 Reference Signs List 1 stator core, 2 coil, 3 insulating sheet, 4 mandrel, 5 protective layer, 5a protective net, 6 mold resin, 7 resin protective layer (conventional), S stator

Claims (2)

[Claims] The present invention relates to a slotless motor stator in which an air-core coil is disposed on an inner peripheral surface of a stator core having no slot. A stator for a slotless motor, wherein a protection layer formed into a shape is inserted so as to cover an inner peripheral surface of the coil, and is then adhesively cured. 2. The stator for a slotless motor according to claim 1, wherein the fibrous body is a glass fiber, a fiber impregnable with a resin or an adhesive, or a metal fiber having an insulating property.