JP2005124295A - Stator of ac servo motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stator for an AC servo motor, wherein an expensive insulating terminal plate is excluded to reduce the number of components for a lower cost, an insulation distance between a teeth end and an armature coil is assured only with a thin insulating material, and deviation between the armature coil and the teeth is eliminated as well. <P>SOLUTION: The stator for an AC servo motor comprises: a stator core (teeth) 11 of a slot structure; and an armature coil 12 whose hollow part is inserted in the stator core 11 while the main body itself is inserted in the slot. A thin insulating material l3 of at least one layer is wound around the stator core 11 to insulate the stator core 11 from the armature coil 12. Here, the thin insulating material 13 is provided with V-shaped bending parts 13d1, 13d2, 13d3 for assuring a constant distance between the teeth part of the stator core 11 and the armature coil 12. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a stator of an AC servo motor, and more particularly to an insulating structure of the stator.

The conventional AC servo motor insulation structure includes a portion that insulates the armature winding inside the stator core teeth portion and a portion that covers the armature winding side portion of the insulation material. It is already known that a portion covering the armature winding side portion of the armature is bent to insulate the stator core from the armature winding (see, for example, Patent Document 1).
JP 2003-61286 A

5A and 5B are schematic views of an AC servomotor stator insulation structure described in Patent Document 1. FIG. 5A is a perspective view after assembly, and FIG. 5B is a perspective view before assembly.
5A and 5B, 31 is a laminated iron core, 32 is an insulating material, and 33 is an insulating end plate. The laminated core 31 includes concave slot portions 31b on both sides of the tooth portion 31a. The laminated core 31 is provided with insulating end plates 33 on both ends of the laminated core 31 and insulating materials 32 on the slot portions 31b on both sides. Is insulated.
Then, the winding body 34 is formed by concentrating the coil around the tooth portion 31a, and the linear portion (slot portion) of the winding body 34 is covered so as to fold and wrap the protruding insulating material 32.

FIG. 6 is a longitudinal sectional view in the axial direction of an AC servomotor incorporating the stator described in Patent Document 1 of FIG.
In the figure, 40 is a stator, 41 is a rotor, and the rotor 41 is composed of a shaft 42 and a permanent magnet 43 provided on the shaft 42, and the stator 40 is fixed to the stator core 44. The armature winding 45 is configured to wind the child core 44. The rotor 41 is supported by a bearing 46 provided at the center of the stator 40. Insulating end plates 33 are attached to both ends of the stator core 44, thereby insulating the stator core 44.

Thus, in the case of the conventional insulating structure, it is necessary to insert an insulating end plate in order to secure the insulating distance at the end of the tooth, leading to an increase in the number of parts and an increase in cost.
Accordingly, the present invention has been made to solve these problems, and an object thereof is to obtain an AC servo motor stator that eliminates an insulating end plate, reduces the number of parts, and leads to cost reduction.

The present invention has been made to solve the above-mentioned problems, and the invention of the stator for an AC servo motor according to claim 1 includes a stator core having a slot structure, a hollow portion in the stator core, and the stator core. In an AC servo motor stator comprising an armature winding in which a main body is fitted in a slot, an insulating thin object of one layer or two or more layers is provided as an insulation between the stator core and the armature winding. The insulating thin object is provided with a V-shaped bent portion for winding around the stator core and securing a fixed distance between the tooth portion of the stator core and the armature winding. And
According to a second aspect of the present invention, in the AC servo motor stator according to the first aspect, the thin insulating material is an insulating paper or an insulating film.
According to a third aspect of the present invention, in the AC servo motor stator according to the first or second aspect, the thin insulating material is a developed view, and two rectangular bodies separated from each other, and the two rectangular bodies. And a connecting portion configured to be narrower than the side of the connected rectangular body.
According to a fourth aspect of the present invention, in the AC servo motor stator according to the third aspect, the V-shaped bent portion is formed by bending the connecting portion.

The invention of the AC servo motor according to claim 5 is an AC servo motor having a shaft, a rotor having a permanent magnet provided on the outer periphery of the shaft, and a stator that rotatably supports the rotor through a gap. The stator is the stator according to any one of claims 1 to 4.

  With the configuration as described above, the insulating end plate can be eliminated, leading to a reduction in the number of motor parts and cost. Moreover, the insulation distance of a tooth | gear edge part can be ensured only with an insulating material, and the position shift of a tooth | gear and armature winding can also be eliminated.

Hereinafter, the best mode for carrying out the present invention will be described with reference to FIGS.
FIG. 1 is a longitudinal sectional view in the axial direction of an AC servomotor that employs a stator having an insulating thin object according to the present invention. FIG. 2 is a development view of the thin insulating material. 3A and 3B are perspective views for explaining the process from assembling the insulating thin object of FIG. 2 until the core is inserted, where FIG. 3A is an assembled state of the insulating thin object, FIG. 3B is a relationship with the stator core, and FIG. ) Shows a state in which an insulating thin object is mounted on the stator core. FIG. 4 shows a plan view in which armature windings are fitted into the stator core of FIG.
In FIG. 1, reference numeral 40 denotes a stator, 41 denotes a rotor, and the rotor 41 includes a shaft 42 and a permanent magnet 43 provided on the shaft 42, and the stator 40 includes a stator core 44. The armature winding 45 is wound around the stator core 44. The rotor 41 is supported by a bearing 46 provided at the center of the stator 40.
In addition, a thin insulating material 13 (described later) is interposed between the stator core 44 and the armature winding 45 to ensure a constant distance between the stator core 44 and the armature winding 45.

FIG. 2 is a development view of an insulating thin object, and includes two rectangular bodies 131 and 132 that are spaced apart from each other, and a connecting portion 13d2 that connects the two rectangular bodies 131 and 132 to each other. The width t1 of 13d2 is configured to be narrower than the length t2 of the sides of the connected rectangular bodies 131 and 132 (t2> t1). Each of the rectangular bodies 131 and 132 is provided with a folding line L1 that is folded in a mountain and a folding line L2 that is folded in a valley, for example.
Each rectangular body 131, 132 is composed of surrounding portions 13a, 13b and 13d, 13e of the armature winding 45, and core contact portions 13c1, 13c2 in contact with the stator core 44, with the bend line L1 as a boundary. Similarly, connecting portions 13d1 and 13d3 are provided on opposite sides of the connecting portion 13d2.

  When each fold line of the thin insulating object 13 in FIG. 2 is fold-folded and valley-folded, the result is as shown in FIG. When the V-shaped bent portions of the connecting portions 13d1 and 13d3 of the thin insulating material 13 are overlapped, a diagram (b) is obtained. 11 in FIG. 1B is a tooth of the stator core 44 (FIG. 1), and a part of the stator core 44 is depicted. Since the insulating thin body 13 assembled in this way has a large through-opening at the center, insertion of the teeth 11 of the stator core 44 (FIG. 1) into the through-opening shows the figure (c). As described above, the insulating thin object 13 according to the present invention is mounted around the teeth 11 of the stator core 44 (FIG. 1).

As shown in FIG. 4C, a hollow armature winding 45 (FIG. 1) is provided around the teeth 11 of the stator core 44 (FIG. 1) to which the insulating thin body 13 according to the present invention is attached. The fitted state is shown in a plan view. In FIG. 3, for the sake of easy understanding, the folding lines L1 of the rectangular bodies 131 and 132 have been shown in a folded state. However, the folding is actually performed after the armature winding 45 is fitted.
As can be seen from the drawing, V-shaped bent portions 13d1, 13d2, and 13d3 are formed on the side surface of the tooth 11 facing the bent portion of the armature winding 45 (FIG. 1).
With the V-shaped bent portions 13d1, 13d2, and 13d3, the insulation interval and position fixing of the armature winding 45 can be easily and inexpensively ensured simultaneously.

  As described above, the AC servo motor according to the present invention winds one or more insulating thin objects around the stator core as the insulation between the stator core and the armature winding. Since the V-shaped bent part for securing a certain distance between the core tooth part and the armature winding is provided in the insulating thin object, the number of parts can be reduced by eliminating the conventional expensive insulating end plate. In addition to reducing the cost, the insulation distance between the tooth end portion and the armature winding can be ensured with only the thin insulating material, and at the same time, the positional deviation between the armature winding and the tooth can be eliminated.

It is an axial direction longitudinal cross-sectional view of the AC servomotor which employ | adopted the stator provided with the insulating thin thing which concerns on this invention. It is a development view of an insulating thin object according to the present invention. FIGS. 3A and 3B are perspective views for explaining a process from assembling the thin insulating object shown in FIG. 2 until the core is inserted, in which FIG. 2A is an assembled state of the insulating thin object, FIG. 2B is a relationship with the stator core, and FIG. The state where the insulating thin object was mounted | worn to the child core is each shown. The top view which fitted the armature coil | winding in the stator core of FIG.3 (c) is shown. It is the schematic of the insulation structure of the stator of the AC servomotor of patent document 1, (a) is after an assembly, (b) is a perspective view before an assembly. FIG. 6 is an axial longitudinal sectional view of an AC servomotor incorporating the stator described in Patent Document 1 in FIG. 5.

Explanation of symbols

11 Teeth 12 Armature winding 13 Insulating thin member 131, 132 Rectangular body 13d1-13d3 Connecting portion 13a, 13b, 13d, 13e Armature winding surrounding portion 13c1, 13c2 Stator core contact portion L1 Mountain fold line L2 Valley Folding line 40 Stator 41 Rotor 42 Shaft 43 Permanent magnet 44 Stator core 45 Armature winding 46 Bearing

Claims (5)

In a stator for an AC servo motor comprising a stator core having a slot structure, and an armature winding in which a hollow portion is fitted in the stator core and a main body is fitted in the slot,
As the insulation between the stator core and the armature winding, one layer or two or more layers of insulating thin material are wound around the stator core, and at that time, the teeth portion of the stator core and the armature winding An AC servomotor stator, characterized in that a V-shaped bent portion for securing a certain distance of the wire is provided in the thin insulating material. 2. The AC servo motor stator according to claim 1, wherein the insulating thin material is an insulating paper or an insulating film. In the developed view, the thin insulating material includes two rectangular bodies that are spaced apart from each other, and a connecting portion that connects the two rectangular bodies and is configured to be narrower than the sides of the connected rectangular bodies. 3. The AC servo motor stator according to claim 1, further comprising an AC servo motor stator. The AC servo motor stator according to claim 3, wherein the V-shaped bent portion is formed by bending the connecting portion. An AC servomotor having a shaft, a rotor provided with permanent magnets on the outer periphery of the shaft, and a stator that rotatably supports the rotor via a gap, wherein the stator is any one of claims 1 to 4. An AC servomotor characterized by being the stator described in the item.

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