JP5981225B2 - Manufacturing method of laminated iron core - Google Patents

Description

The present invention relates to a rotor laminated core in which permanent magnets are respectively inserted into a plurality of magnet insertion holes provided in the rotor laminated iron core and fixed with resin.

Conventionally, a rotor laminated core in which a permanent magnet inserted into a magnet insertion hole is brought into contact with either the outer peripheral surface or the inner peripheral surface of the rotor laminated iron core in the magnet insertion hole and fixed with resin. It has been known.

For example, Patent Document 1 discloses an injection port for injecting a resin formed at one end in the width direction of a magnet insertion hole and a discharge hole for discharging a resin formed at the other end in the width direction. And a groove for promoting the wraparound of the resin is formed on the outer peripheral surface of the magnet insertion hole, so that the resin wraps around the outer periphery of the magnet insertion hole and the permanent magnet is moved to the inner peripheral surface of the magnet insertion hole. And a method of fixing it toward the center is disclosed.

Japanese Patent No. 4734957

In the method of Patent Document 1, since resin is injected from one end in the width direction of the magnet insertion hole, the force by which the resin presses the permanent magnet against the inner peripheral surface of the magnet insertion hole is even at both ends of the permanent magnet. It does not become a cause of tilting and fixing. Furthermore, since the groove that promotes the wrapping of the resin is too small, even if the resin flows into the groove, no force is generated to press the permanent magnet against the inner peripheral surface. As a result, the permanent magnet is placed in the magnet insertion hole. It cannot be fixed by pressing against the circumferential surface.

The present invention has been made in view of such circumstances, and the permanent magnet inserted into the rotor laminated core is brought close to either the inner peripheral surface or the outer peripheral surface of the magnet insertion hole, and the permanent magnet An object of the present invention is to provide a rotor laminated iron core that can be fixed without tilting a magnet.

Rotation in which permanent magnets respectively inserted into a plurality of magnet insertion holes formed in the rotor laminated core are brought to the outer peripheral surface or inner peripheral surface of the magnet insertion holes and fixed to the rotor laminated core with resin. In the child laminated iron core, a resin reservoir portion and a magnet holding portion formed in a portion facing the upper and lower end portions of the permanent magnet are provided on the surface of the magnet insertion hole opposite to the surface to which the permanent magnet is brought close. It is characterized by.

In the rotor laminated iron core, a resin injection groove formed along an axial direction of the rotor laminated iron core is provided on a surface of the magnet insertion hole opposite to a surface to which the permanent magnet is brought, and the resin injection The groove and the resin reservoir are in communication with each other.

In the rotor laminated iron core, the resin injection groove is formed at the center of the surface of the magnet insertion hole opposite to the surface to which the permanent magnet is brought close.

In the above-described rotor laminated iron core, the thickness of the magnet holding portion is 1 to 4 mm.

According to the first aspect of the present invention, a large amount of the resin injected into the magnet insertion hole flows into the resin reservoir provided on the surface of the magnet insertion hole on the side opposite to the surface on which the permanent magnet is brought close to the permanent magnet. It is pressed against the surface on the near side and fixed. At this time, since the permanent magnet is vertically held by the magnet holding portion, the permanent magnet is fixed without being inclined.

According to the second aspect of the present invention, a large amount of resin flows into the resin reservoir by injecting resin from the resin injection groove provided on the surface of the magnet insertion hole on the side opposite to the surface on which the permanent magnet is attracted. It is possible to enhance the effect of being pressed and fixed to the surface on which the magnet comes close.

According to the invention of claim 3, since the resin injection groove is formed at the center of the surface opposite to the surface on which the permanent magnet is moved, the flow of the resin is equal to the left and right in the width direction of the permanent magnet. The force pressed against the surface on the approaching side is also equal left and right in the width direction of the permanent magnet, and the effect of fixing the permanent magnet without tilting can be enhanced.

According to the invention of claim 4, when the resin is pressed from the resin injection groove, the resin holding portion is formed small by the magnet holding portion, and the pressing force against the surface on the side to which the permanent magnet is approached is suppressed. The permanent magnet can be resin-fixed without the surface of the holding part being deformed.

It is a top view of the rotor lamination | stacking iron core which concerns on one embodiment of this invention. It is the top view which showed the magnet insertion hole periphery of the rotor lamination | stacking iron core which concerns on one embodiment of this invention. It is the longitudinal cross-sectional view which showed the magnet insertion hole periphery of the rotor lamination | stacking iron core which concerns on one embodiment of this invention, (A) shows the AA cross section in FIG. 2, (B) is in FIG. A BB cross section is shown.

Subsequently, a rotor laminated core according to an embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a plan view of a rotor laminated core 10 according to an embodiment of the present invention. A plurality of magnet insertion holes 11 into which the permanent magnets 12 are inserted are formed in the rotor laminated core 10.

FIG. 2 is an enlarged view around the magnet insertion hole 11 of the rotor laminated core 10 of FIG. The magnet insertion hole 11 has a larger diameter than the permanent magnet 12, and a gap is formed between the permanent magnet 12 and the magnet insertion hole 11. The permanent magnet 12 can be fixed to the magnet insertion hole 11 by filling the gap between the permanent magnet 12 and the magnet insertion hole 11 with resin. Here, the permanent magnet 12 is fixed to either the inner peripheral surface or the outer peripheral surface of the magnet insertion hole 11 (in this embodiment, the outer peripheral surface). In the magnet insertion hole 11, a resin injection groove 15 having a substantially semicircular cross section is formed on the surface opposite to the surface on which the permanent magnet 12 is brought close (in this embodiment, the inner peripheral surface).

FIG. 3 is a longitudinal sectional view around the magnet insertion hole 11 of the rotor laminated core 10. Here, FIG. 3A shows an AA cross section in FIG. 2, and FIG. 3B shows a BB cross section in FIG. As shown in FIG. 3A, a resin injection groove 15 is formed along the axial direction on the inner peripheral surface of the magnet insertion hole 11, and as shown in FIG. The inner surface of the magnet insertion hole 11 is formed with a resin reservoir 13 into which the injected resin flows and a magnet holder 14 that holds the permanent magnet 12. The resin injection groove 15 and the resin reservoir 13 are formed so as to communicate with each other.

When the resin is injected into the magnet insertion hole 11, the resin is injected from the resin injection groove 15 formed on the inner peripheral surface of the resin insertion hole 11. At the initial stage of resin injection, most of the resin injected from the resin injection groove 15 flows into the resin reservoir 13 formed on the inner peripheral surface of the resin insertion hole 11, so that the permanent magnet 12 is inserted into the resin insertion hole 11. A force is generated to press against the outer peripheral surface. As a result, the permanent magnet 12 is fixed to the magnet insertion hole 11 while being brought close to the outer peripheral surface of the magnet insertion hole 11.

By forming the resin injection groove 15 at the center of the inner peripheral surface of the magnet insertion hole 11, the flow of resin from the resin injection groove 15 to the resin reservoir 13 becomes equal in the width direction of the permanent magnet 12. The force pressing the permanent magnet 12 against the outer peripheral surface of the magnet insertion hole 11 is also equal to the left and right in the width direction of the permanent magnet 12, and the permanent magnet 12 can be prevented from being tilted and fixed.

The resin reservoir 13 and the resin injection groove 15 are formed radially inside the rotor laminated core 10, and the distance a between the resin injection groove 15 and the permanent magnet 12 and the distance b between the resin reservoir 13 and the permanent magnet 12. Are preferably the same. If the distance a between the resin injection groove 15 and the permanent magnet 12 is large, the amount of resin flowing into the resin injection groove 15 increases, and it takes time until the permanent magnet 12 is pressed against the outer peripheral surface of the magnet insertion hole 11. The resin may wrap around the outer peripheral surface before the permanent magnet 12 is pressed against the outer peripheral surface.

When the resin is injected, the permanent magnet 12 inserted into the magnet insertion hole 11 is a magnet holding member formed in a predetermined range in a portion facing the upper and lower ends of the permanent magnet 12 on the inner peripheral surface of the magnet insertion hole 11. It is held vertically by the part 14. As shown in FIG. 3B, when the permanent magnet 12 is divided into a plurality (two in this embodiment), each of the divided permanent magnets 12 on the inner peripheral surface of the magnet insertion hole 11. Magnet holding portions 14 are respectively formed in portions facing the upper and lower end portions.

The magnet holding part 14 prevents the permanent magnet 12 from being tilted and fixed, and prevents the resin reservoir part 13 from being dammed by the tilting of the permanent magnet 12. If the magnet holding portion 14 is too thick (the range is too large), the resin reservoir portion 13 is formed small, and the force for pressing the permanent magnet 12 against the outer peripheral surface of the magnet insertion hole 11 becomes weak. In addition, if the magnet holding portion 14 is too thin, the surface of the magnet holding portion 14 may be deformed when the resin is press-fitted from the resin injection groove 15, so the thickness of the magnet holding portion 14 is about 1 to 4 mm. Is preferred.

So far, the case of injecting resin from the resin injection groove 15 has been described, but even if the resin injection groove 15 is not provided, by injecting resin from the gap on the inner peripheral side of the magnet insertion hole 11, The effect that the magnet 12 is fixed to the outer peripheral surface is obtained.

As described above, the present invention has been described with reference to the embodiment. However, the present invention is not limited to the configuration described in the above-described embodiment, and the matters described in the scope of claims. Other embodiments and modifications conceivable within the scope are also included. For example, the resin reservoir, the resin injection groove, and the magnet holding portion are provided on the inner peripheral surface of the magnet insertion hole, but may be provided on the outer peripheral surface of the magnet insertion hole.

10: Rotor laminated iron core, 11: Magnet insertion hole, 12: Permanent magnet, 13: Resin reservoir, 14: Magnet holder, 15: Resin injection groove

Claims (6)

A rotor laminated iron core extending in the laminating direction and having a magnet insertion hole into which at least one permanent magnet is inserted ,
The outer peripheral surface or inner peripheral surface of the magnet insertion hole is an uneven surface in which convex portions and concave portions extending in a direction orthogonal to the stacking direction are alternately arranged in the stacking direction,
The convex portion is
The permanent magnets are arranged so as to face each end in the stacking direction of the permanent magnets in a non-contact state,
In the magnet insertion hole has a function of suppressing the permanent magnet from being fixed by the resin in a tilted state,
The recess has a function of storing the resin inside,
The permanent magnet core according to claim 1, wherein the permanent magnet is pressed against a surface of the magnet insertion hole opposite to the concave and convex surface by the resin accumulated in the concave portion .   In the rotor laminated core according to claim 1, a plurality of the permanent magnets are inserted in the magnet insertion hole so as to be aligned in a row in the lamination direction,
  The rotor laminated core, wherein the convex portions are arranged so as to face each end portion in the laminating direction of the permanent magnets in a non-contact state with the permanent magnets. Wherein the laminated rotor core according to claim 1 or 2, with the surface opposite to the uneven surface of the inlet in the vicinity and the magnet insertion holes of said magnet insertion hole extends in the stacking direction A resin injection groove functioning as an injection path for the resin into the magnet insertion hole is formed ,
The rotor-laminated iron core is characterized in that the resin injection groove and the recess communicate with each other. 4. The rotor laminated core according to claim 3 , wherein the resin injection groove is formed at a center of a surface of the magnet insertion hole opposite to the uneven surface . 5.   5. The rotor laminated core according to claim 3, wherein the resin injection groove has a semicircular shape when viewed from the lamination direction. 6. The rotor laminated core according to any one of claims 1 to 5 , wherein the convex portion has a thickness of 1 to 4 mm.

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