JP2010200592A - Armature of ac servo motor and ac servo motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an armature of an AC servo motor and an AC servo motor capable of reducing withstand-voltage failure between a stator core and an armature winding, accurately positioning a winding bobbin, and reducing breakage of the armature winding. <P>SOLUTION: In the armature of the AC servo motor, a bobbin inner core contact section 19 that is on a counter-load side within the hollow section 2A of a winding bobbin 1 is provided with a bobbin inner core run-off section 17 in a region facing the vicinity of an edge section 3C of an inner core 3. A bobbin outer core contact section 18 that is a region facing the contact section of an outer core 4 is formed into a planar surface. A projection 20 is provided in a region facing the inner core 3 on a load side within the hollow section 2A of the winding bobbin 1. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to an armature for an AC servo motor having an armature core composed of an outer core and an inner core, having a winding bobbin attached to the inner core and winding an armature winding.

Conventionally, an inner core having a plurality of core teeth protruding inward and connecting the inner sides of adjacent core teeth, a ring-shaped outer core fitted to the outside of the inner core, and attached to the inner core And the armature of the AC servo motor provided with the coil | winding bobbin which has the hollow part which wound the armature coil | winding is proposed (for example, refer patent document 1).
6 is a front view of a conventional AC servo motor, FIG. 7 is an enlarged side sectional view of the motor stator portion of FIG. 6 viewed from the side, and FIG. 8 is attached to the inner core of the motor stator of FIG. It is a top view which shows the insertion part of the winding bobbin made.
In FIG. 6, 1 is a winding bobbin, 2 is an armature winding, 2A is a hollow portion, 3 is an inner core, 3A is an iron core tooth, 3B is a bridging portion, 4 is an outer core, and in FIG. The outer core contact portion, 19 is a bobbin inner core contact portion, in FIG. 8, 3C is an edge, and 22 is a bobbin inner core insertion portion.
The armature of the AC servo motor shown in FIGS. 6 and 7 includes an inner core 3 having a plurality of iron core teeth 3A protruding inward and the inner sides of the adjacent iron core teeth 3A being connected by a bridging portion 3B. , A ring-shaped outer core 4 and a winding bobbin 1 having a hollow portion 2A around which the armature winding 2 is wound. The inner core 3 is inserted into the hollow portion 2A of the winding bobbin 1 to which the armature winding 2 is mounted, and the outer core 4 is assembled into the inner core 3 by shrink fitting. The bobbin inner core contact portion 19 and the bobbin outer core contact portion 18 on the opposite load side of the winding bobbin 1 shown in FIG. 7 are located on the same plane. Further, it is necessary to determine the dimension of the winding bobbin 1 in consideration of the dimensional tolerance in the stacking direction of the inner core 3, and the dimensions are such that the winding bobbin 1 can be inserted even with the maximum dimension of the inner core 3.
In addition, as shown in FIG. 8, the inner core 3 shown in FIG. In FIG. 8, the bobbin inner core contact portion 19 and the bobbin outer core contact portion 18 on the opposite side of the winding bobbin 1 are located on the same plane. In consideration of the thickness tolerance of the inner core 3, the bobbin inner core insertion portion 22 of the winding bobbin 1 has a shape that can be inserted even with the maximum dimension of the inner core 3.

JP-A-8-182265 (Page 3, FIGS. 1 and 2)

However, the shape of the conventional winding bobbin 1 is such that the anti-load-side bobbin inner core contact portion 19 is in contact with the plane, and the edge 3C of the inner core end portion is in contact with the corner of the bobbin inner core insertion portion 22. They are in contact with each other and pressed by the molding resin molding pressure, and a breakdown voltage failure occurs between the inner core 3 and the armature winding 2. Depending on the direction of the pressing of the inner core 3, there is a problem that when the winding bobbin 1 is inserted, the corners of the bobbin insertion part are scraped off, resulting in poor pressure resistance. In this case, the gate position of the mold resin is on the anti-load side, and the mold resin flows from the anti-load side to the load side.
In addition, in consideration of the thickness tolerance of the inner core 3, a gap is generated between the bobbin inner core insertion portion 22 and the inner core 3 in order to obtain the dimension of the inner bobbin insertion portion 22 of the winding bobbin 1. When positioning of the wire bobbin 1 is difficult and a gap is generated on the anti-load side, the winding bobbin 1 moves from the anti-load side to the load side during molding resin molding, and as a result, between the windings of the armature winding 2 There is a problem that stress is applied to a soldering portion of a connection board (not shown) provided for connection, and the armature winding 2 is disconnected. Furthermore, there is a problem that mold resin flows into the gap between the non-load side of the winding bobbin 1 and the outer core 4 and the winding bobbin 1 is deformed, resulting in disconnection of the armature winding 2 and defective breakdown voltage. It was.
The present invention has been made in view of such a problem, and reduces the breakdown voltage failure between the stator core and the armature winding, performs reliable positioning of the winding bobbin, and breaks the armature winding. An object of the present invention is to provide an AC servomotor armature and an AC servomotor that can be reduced.

In order to solve the above-mentioned problem, an invention according to claim 1 of the present invention includes an inner core having a plurality of iron core teeth protruding inward and connecting inner sides of adjacent iron core teeth, and the inner core. An AC servomotor armature comprising: a ring-shaped outer core fitted on an outer side of the coil; and a winding bobbin attached to the inner core and having a hollow portion around which an armature winding is wound. The anti-load side inside the hollow part of the bobbin is provided with a relief part in a part facing the vicinity of the edge part of the inner core, and a part facing the contact part with the outer core is formed in a plane. It is a feature.
The invention according to claim 2 is the armature of the AC servo motor according to claim 1, wherein the load side inside the hollow portion of the winding bobbin is a stator core composed of the inner core and the outer core. A protrusion is provided at a portion facing the inner core so that the bobbin can be inserted into the inner core even if the thickness of the stack varies.
According to a third aspect of the present invention, there is provided a rotor provided with the armature according to the first or second aspect, and a rotor provided with a permanent magnet that forms a field disposed opposite to the inner side of the armature via a magnetic gap. It features an AC servo motor equipped with

According to the first aspect of the present invention, the edge of the inner core end portion does not contact the corner portion of the bobbin inner core insertion portion and is not pressed by the molding resin molding pressure. Can be prevented. Even in the direction of the inner core pressing process, the corner portion of the bobbin insertion portion is not scraped off when the bobbin is inserted. The outer core contact portion is flat and has no gap, can prevent deformation of the bobbin due to the inflow of the mold resin, and can prevent coil disconnection and defective pressure resistance.
According to the second aspect of the present invention, the bobbin can be easily inserted into the inner core even if the dimensions change due to the tolerance of the inner core thickness, and a gap can be prevented between the anti-load side bobbin insertion portion and the inner core. For this reason, the bobbin from the anti-load side to the load side moves during molding resin molding, and the mold resin can be prevented from flowing into the gap between the anti-load side bobbin and the outer core.
According to invention of Claim 3, the AC servomotor which has an effect by the armature of Claim 1 or 2 can be provided.

1 is a side sectional view of an AC servomotor showing a first embodiment of the present invention. Motor stator portion enlarged side sectional view of the present invention The top view which shows the insertion part of the winding bobbin attached to the inner core which looked at the motor stator of FIG. 2 from arrow A Explanatory drawing for attaching an inner core to the bobbin insertion part of the present invention, The top view which shows the insertion part of the winding bobbin with which the inner core of the AC servomotor by 2nd Example of this invention is mounted | worn Front view of a conventional AC servo motor FIG. 6 is an enlarged side sectional view of the motor stator portion of FIG. FIG. 8 is a plan view showing an insertion portion of a winding bobbin that is mounted on the inner core of the motor stator of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a side sectional view of an AC servo motor showing a first embodiment of the present invention.
In FIG. 1, 1 is a winding bobbin, 2 is an armature winding, 3 is an inner core, 4 is an outer core, 5 is a frame, 6 is a wiring board, 7 is a permanent magnet, 8 is a mold resin, and 9 is a load side. Bearings 10 and 10 are anti-load side bearings, 11 is a load side bracket, 12 is an anti load side bracket, 13 is a rotor, 14 is a wave washer, 15 is an encoder, and 16 is an encoder cover.
The AC servo motor includes an armature composed of an outer core 4 formed by mounting an inner core 3 on a winding bobbin 1 wound with an armature winding 2 and shrink-fitting the inner core 3, and an inner side of the armature. And a rotor 13 provided with a permanent magnet 7 that forms a magnetic field opposed to each other via a magnetic gap, and a mold resin 8 between the opposite side of the winding bobbin 1 and the outer core 4. And the both ends of the rotor 13 fixed to the outer periphery of the permanent magnet 7 are supported by both brackets 11 and 12 via bearings 9.10.
In FIG. 1, the basic configuration of the armature of the AC servo motor according to the embodiment of the present invention is that the inner core 3 is attached to the winding bobbin 1 and the inner core 3 is shrink-fitted to the outer core 4 as in the prior art. .
FIG. 2 is an enlarged side sectional view of the motor stator portion of the present invention, and FIG. 3 is a plan view showing an insertion portion of a winding bobbin attached to the inner core when the motor stator of FIG. In FIG. 2, 17 is a bobbin inner core escape portion, 18 is a bobbin outer core contact portion, 19 is a bobbin inner core contact portion, and 20 is a protrusion.
In FIG. 2, the present invention is different from the prior art in that the anti-load side (bobbin inner core contact portion 19) inside the hollow portion 2 </ b> A of the winding bobbin 1 faces the vicinity of the edge portion 3 </ b> C of the inner core 3. The bobbin inner core escape portion 17 is provided on the bobbin, and the bobbin outer core contact portion 18 which is a portion facing the contact portion of the outer core 4 is formed on a plane.
In addition, on the load side inside the hollow portion 2A of the winding bobbin 1, the winding bobbin 1 can be inserted into the inner core 3 even if the thickness of the stator core composed of the inner core 3 and the outer core 4 varies. The projection 20 is provided in a portion facing the inner core 3.
Next, the process of attaching the winding bobbin to the inner core will be described with reference to FIG. FIG. 4 is an explanatory diagram for mounting the inner core on the bobbin insertion portion of the present invention. ,
As shown in FIG. 4, the winding bobbin 1 having the armature winding 2 wound is inserted into the bobbin insertion portion 21 of the inner core 3, and then the outer periphery of the inner core is mounted with the armature winding. An armature core is completed by shrink fitting an outer core (not shown).
In the first embodiment, as shown in FIG. 3, a bobbin inner core relief portion 17 is provided on the opposite side of the winding bobbin 1 to the vicinity of the edge portion 3C of the inner core 3, and the winding bobbin 1 Since the positioning projection 20 is provided on the load side of 1, a gap generated at the contact portion between the inner core 3 and the outer core 4 on the opposite side of the winding bobbin 1 can be eliminated.

FIG. 5 is a plan view showing the insertion portion of the winding bobbin mounted on the inner core of the AC servomotor according to the second embodiment of the present invention, which corresponds to the view of the motor stator of FIG. To do.
5, positioning protrusions 23 having a shape different from that in FIG. 4 are provided.
Thereby, the 2nd Example can eliminate the clearance gap which arises in the contact part of the inner core 3 and the outer core 4 in the anti-load side of the winding bobbin 1 like 1st Example.

1 Winding bobbin 2 Armature winding 3 Inner core (stator core)
4 Outer core (stator core)
5 Frame 6 Connection board 7 Permanent magnet 8 Mold resin 9 Load-side bearing 10 Anti-load-side bearing 11 Load-side bracket 12 Anti-load-side bracket 13 Rotor 14 Wave washer 15 Encoder 16 Encoder cover 17 Bobbin inner core contact 18 Bobbin outer core contact Part 19 Bobbin inner core contact part 20 Protrusion 21 Inner core bobbin insertion part 22 Bobbin inner core insertion part 23 Protrusion

Claims (3)

An inner core having a plurality of core teeth protruding inward and connected to the inside of the adjacent core teeth, a ring-shaped outer core fitted to the outside of the inner core, and attached to the inner core; And a winding bobbin having a hollow portion wound with an armature winding, and an armature of an AC servo motor,
The anti-load side inside the hollow portion of the winding bobbin is provided with a relief portion at a portion facing the vicinity of the edge portion of the inner core, and a portion facing the contact portion with the outer core is formed in a plane. An AC servo motor armature characterized by comprising:   The load side inside the hollow portion of the winding bobbin faces the inner core so that the bobbin can be inserted into the inner core even if the thickness of the stator core composed of the inner core and the outer core varies. 2. The armature for an AC servo motor according to claim 1, wherein a projection is provided at a portion.   3. An AC servo motor comprising: the armature according to claim 1; and a rotor provided with a permanent magnet that forms a field disposed inside the armature so as to face each other via a magnetic gap. .

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