JP5734148B2 - Magnet-embedded rotor and method for manufacturing the same - Google Patents

Description

  The present invention relates to a magnet-embedded rotor in which permanent magnets are mounted in a plurality of magnet insertion holes provided on the outer peripheral portion of a rotor laminated iron core of a motor, and a method for manufacturing the same. The present invention relates to a structure for fixing in an insertion hole and a method for manufacturing the structure.

  As a conventional magnet-embedded rotor, for example, as shown in Patent Document 1, a permanent magnet is laminated by placing an adhesive sheet impregnated or coated with an adhesive on the outer periphery of the permanent magnet. It has been proposed to be fixed in a magnet insertion hole provided in the. However, in such a magnet-embedded rotor, since the adhesive sheet impregnated or coated with an adhesive is disposed on the outer periphery of the permanent magnet, the position of the permanent magnet in each magnet insertion hole is not constant. However, there is a problem that the magnetic properties and the weight balance are deteriorated and the performance is deteriorated.

  On the other hand, for example, in Patent Document 2, the inner diameter side of the magnet insertion hole into which the permanent magnet provided in the laminated iron core is inserted is penetrated in the axial direction along the central axis of the laminated iron core. By forming an injection hole communicating with the magnet insertion hole at the corresponding position and filling the resin member between the magnet insertion hole and the permanent magnet through the injection hole, the permanent magnet can be balanced. Proposes to fix securely.

JP-A-9-163649 (page 4, FIG. 1) Japanese Patent Application Laid-Open No. 2002-34187 (page 3 to page 4, FIGS. 1 to 5)

  In the above-mentioned Patent Document 2, there is no ferromagnetic material, which is a thin plate member constituting the laminated iron core, in the injection hole, causing a slight increase in magnetic resistance, and a high performance motor with high output and high efficiency. In this case, there is a problem that the motor performance may be lowered.

  The present invention has been made to solve the above-described problems. The permanent magnet is securely fixed in a well-balanced manner, the increase in the magnetic resistance is suppressed, and the motor-embedded rotor does not deteriorate the motor performance and the manufacture thereof It is intended to provide a method.

A magnet-embedded rotor according to the present invention is formed in a cylindrical shape by laminating first plate-like magnetic members, and penetrates in the axial direction in the vicinity of the outer periphery of the cylindrical shape with a predetermined interval in the circumferential direction. A magnet embedded type having a plurality of formed magnet insertion holes, a laminated iron core having a shaft insertion hole into which a shaft is inserted at the center, and a permanent magnet fitted into each of the magnet insertion holes. In the rotor,
At least one second plate-like magnetic member in which a resin injection hole communicating with each of the magnet insertion holes is formed on one end side in the axial direction of the laminated core is laminated,
The second plate-like magnetic member includes a protrusion protruding from the inner peripheral wall surface of the resin injection hole,
The permanent magnet has a circumferential length and a radial length shorter than the circumferential length and the radial length of the plurality of magnet insertion holes, and a wall surface at a circumferential end of the magnet insertion hole. Between the peripheral end surface of the permanent magnet and between the outer peripheral wall surface of the magnet insertion hole and the outer peripheral side surface of the permanent magnet or between the inner peripheral wall surface of the magnet insertion hole and the permanent magnet. A gap is formed between the inner peripheral side surface,
The void is filled with resin.

A method for manufacturing a magnet-embedded rotor according to the present invention is formed in a cylindrical shape by laminating first plate-like magnetic members, and in the axial direction in the vicinity of the outer periphery of the cylindrical shape with a predetermined interval in the circumferential direction. A laminated iron core having a plurality of magnet insertion holes that are formed through and projecting radially outward, and a plurality of magnet cores that are fitted into each of the magnet insertion holes and project radially outward In a method of manufacturing a magnet-embedded rotor having a permanent magnet,
At least one second plate-like magnetic member in which a resin injection hole communicating with each of the magnet insertion holes is laminated on one end side in the axial direction of the laminated iron core, and the second plate-like magnetic member includes A protrusion protruding in the radial direction from the circumferential central portion of the inner wall surface of the resin injection hole is formed,
The permanent magnet has a portion whose circumferential length is shorter than the circumferential length of each of the magnet insertion holes, and between the circumferential end surface of each of the magnet insertion holes and the circumferential end surface of the permanent magnet. Forming a void in the
A gap is formed between the outer peripheral side surface of the permanent magnet and the outer peripheral side wall surface of the magnet insertion hole,
The resin injection port position of the mold for injecting the resin into each of the gaps is arranged on the outer peripheral side from the radial center of the magnet insertion hole, and the resin is injected into the gap, so that the permanent injection pressure of the resin is obtained. The inner peripheral side surface of the magnet is pressed against the inner peripheral wall surface of the magnet insertion hole.

In addition, the first plate-like magnetic member is laminated to form a cylindrical shape, and is formed in the vicinity of the outer periphery of the cylindrical shape with a predetermined interval in the circumferential direction and penetrating in the axial direction, and protrudes radially outward. Manufacture of a magnet-embedded rotor having a laminated iron core having a plurality of magnet insertion holes and a plurality of permanent magnets that are inserted into the respective magnet insertion holes and project radially outward In the method
Laminating at least one second plate-like magnetic member having a resin injection hole communicating with each of the magnet insertion holes on one end side in the axial direction of the laminated core;
The permanent magnet has a portion whose circumferential length is shorter than the circumferential length of each of the magnet insertion holes, and between the circumferential end surface of each of the magnet insertion holes and the circumferential end surface of the permanent magnet. Forming a void in the
The curvature radius of the outer peripheral side surface of the permanent magnet is made larger than the curvature radius of the outer peripheral wall surface of the magnet insertion hole, and a gap is formed between the outer peripheral side surface of the permanent magnet and the outer peripheral wall surface of the magnet insertion hole. Forming the radius of curvature of the inner peripheral side surface of the permanent magnet substantially the same as the radius of curvature of the inner peripheral wall surface of the magnet insertion hole, and setting the inner peripheral side surface of the permanent magnet to the inner peripheral side of the magnet insertion hole. The resin injection port position of the mold for injecting the resin into each of the gaps is arranged on the outer peripheral side from the radial center of the magnet insertion hole, and the resin is injected into the gap. The inner peripheral side surface of the permanent magnet is pressed against the inner peripheral wall surface of the magnet insertion hole with the injection pressure of

In addition, the first plate-like magnetic member is laminated to form a cylindrical shape, and is formed in the vicinity of the outer periphery of the cylindrical shape with a predetermined interval in the circumferential direction and penetrating in the axial direction, and protrudes radially outward. Manufacture of a magnet-embedded rotor having a laminated iron core having a plurality of magnet insertion holes and a plurality of permanent magnets that are inserted into the respective magnet insertion holes and project radially outward In the method
Laminating at least one second plate-like magnetic member having a resin injection hole communicating with each of the magnet insertion holes on one end side in the axial direction of the laminated core;
The permanent magnet has a portion whose circumferential length is shorter than the circumferential length of each of the magnet insertion holes, and is between the circumferential wall surface of each of the magnet insertion holes and the circumferential end surface of the permanent magnet. Forming a void in the
The radius of curvature of the inner peripheral side surface of the permanent magnet is made smaller than the radius of curvature of the inner peripheral side wall surface of the magnet insertion hole, and the inner peripheral side surface of the permanent magnet and the inner peripheral side wall surface of the magnet insertion hole An air gap is formed between them, and the radius of curvature of the outer peripheral side surface of the permanent magnet is substantially the same as the radius of curvature of the wall surface of the outer peripheral side of the magnet insertion hole, so that the outer peripheral side surface of the permanent magnet is the outer peripheral side of the magnet insertion hole. The resin injection port position of the mold for injecting resin into each of the gaps is arranged on the inner peripheral side from the radial center of the magnet insertion hole, and the resin is injected into the gap, The outer peripheral side surface of the permanent magnet is pressed against the wall surface on the outer peripheral side of the magnet insertion hole by resin injection pressure.

  According to the magnet-embedded rotor according to the present invention, since there is no structure such as a hole or a groove that increases the magnetic resistance of the laminated iron core in the vicinity of the magnet insertion hole of the laminated iron core, there is no decrease in magnetic resistance. The permanent magnet can be securely fixed in the magnet insertion hole in a well-balanced manner by the resin filled in the gap between the laminated core in the magnet insertion hole and the permanent magnet without deteriorating the motor performance.

  According to the magnet-embedded rotor manufacturing method of the present invention, since there is no structure such as a hole or a groove that increases the magnetic resistance of the laminated iron core in the vicinity of the magnet insertion hole of the laminated iron core, There is no decrease, without lowering the motor performance, and at the time of resin filling, filling is completed with the permanent magnet pressed against the inner or outer peripheral side in the magnet insertion hole of the laminated core by resin injection pressure The permanent magnet can be fixed in the magnet insertion hole in a well-balanced and reliable manner.

It is a figure which shows Embodiment 1 of the magnet embedded rotor which concerns on this invention. It is a top view which shows the plate-shaped magnetic member which comprises the laminated iron core of Embodiment 1 of the magnet embedded rotor which concerns on this invention. It is a figure which shows the structure of the laminated iron core which comprises Embodiment 1 of the magnet embedded rotor which concerns on this invention. It is a figure which shows the structure of the state by which the permanent magnet was inserted in the hole for magnet insertion of a laminated iron core. FIG. 3 is a cross-sectional view showing a state in which a laminated core in which permanent magnets are inserted into a molding die for filling a resin into a magnet insertion hole of the laminated core according to the first embodiment. FIG. 6 is a diagram showing a position of a resin inlet for filling a resin into a magnet insertion hole of the laminated iron core according to the first embodiment. It is a figure which shows another example of the resin inlet for filling resin in the magnet insertion hole of a laminated iron core. It is a figure which shows the shape of the permanent magnet of Embodiment 1. FIG. It is sectional drawing which shows the flow condition of resin when resin is filled in the magnet insertion hole of a laminated iron core. It is a figure which shows the flow condition of resin when resin is filled in the magnet insertion hole of a laminated iron core.

Embodiment 1 FIG.
1 (a), 1 (b), and 1 (c) are views showing Embodiment 1 of the magnet-embedded rotor according to the present invention, FIG. 1 (a) is a plan view, and FIG. 1 (b). FIG. 1A is a cross-sectional view taken along line AA in FIG. 1A, and FIG. 1C is a cross-sectional view taken along line BB in FIG. 2 (a) and 2 (b) are plan views showing a plate-like magnetic member constituting the laminated iron core according to the first embodiment of the magnet-embedded rotor according to the present invention, and FIG. FIG. 2 (b) shows a first plate-like magnetic member. 3 (a) and 3 (b) are views showing the structure of the laminated iron core constituting Embodiment 1 of the magnet-embedded rotor according to the present invention. FIG. 3 (a) is a plan view and FIG. (B) is CC sectional drawing in Fig.3 (a). 4 (a) and 4 (b) are views showing a structure in a state where a permanent magnet is inserted into the magnet insertion hole of the laminated core shown in FIG. 3, and FIG. 4 (a) is a plan view and FIG. ) Is a DD cross-sectional view in FIG. FIG. 5 is a cross-sectional view showing a state in which the laminated core in which the permanent magnets are inserted into the molding die for filling the resin into the magnet insertion hole of the laminated core according to the first embodiment. 6 (a) and 6 (b) are views showing the position of the resin injection port for filling the resin into the magnet insertion hole of the laminated core of the first embodiment, and FIG. 6 (a) is a plan view. FIG. 6B is an enlarged plan view showing the position of the resin injection port. FIGS. 7A and 7B are views showing another example of a resin injection port for filling a resin into the magnet insertion hole of the laminated iron core. FIG. 7A is a plan view, and FIG. ) Is an enlarged plan view showing the arrangement of the resin injection ports. 8 (a) and 8 (b) are views showing the shape of the permanent magnet of the first embodiment, where FIG. 8 (a) is a plan view, and FIG. 8 (b) is a side view. Fig. 10 is a cross-sectional view showing the flow of the resin when the resin is filled into the magnet insertion hole of the laminated core, Fig. 10 (a) and (b), when the resin is filled into the magnet insertion hole of the laminated core. It is a figure which shows the flow condition of resin, Fig.10 (a) is a top view, FIG.10 (b) is EE sectional drawing of Fig.10 (a).

Hereinafter, the structure of the magnet-embedded rotor according to the first embodiment will be described.
As shown in FIG. 1, the magnet-embedded rotor 1 according to the first embodiment has a required number of first plate-like magnetic members each having a hole 2d for magnet insertion that protrudes radially outward. 2b is laminated, and has a resin injection hole 2d4 protruding outward in the radial direction, and has at least one projection 2c protruding from the inner peripheral side to the outer peripheral side of the resin injection hole 2d4. A cylindrical laminated iron core 2 formed by laminating two plate-like magnetic members 2a, a permanent magnet 3 inserted into the magnet insertion hole 2d and projecting radially outward, and the center of the laminated iron core 2 The shaft 4 inserted into the shaft insertion hole 4a of the portion and the resin 5 for fixing the permanent magnet 3 to the laminated core 2 are provided. As will be described later, the resin 5 is injected from the resin injection port position 6. The number of the second plate-like magnetic members 2a is preferably 1 to 4 so that the magnetic characteristics of the magnet-embedded rotor are not deteriorated. Further, the protrusion 2c may not be provided, but when the resin 5 is injected, the resin 5 is guided to the outer peripheral side of the permanent magnet 3 by the protrusion 2c and easily flows into the gap 7.

  The permanent magnet 3 is formed with portions in which the circumferential length, radial length, and axial length are shorter than the circumferential length, radial length, and axial length of the magnet insertion hole 2d. Is inserted into the magnet insertion hole 2d, the wall surface at the circumferential end of the magnet insertion hole 2d and the circumferential end surface of the permanent magnet 3, the wall surface on the outer circumferential side of the magnet insertion hole 2d, and the outer circumferential surface of the permanent magnet 3 And a gap 7 is formed between the plate surface of the protrusion 2c and the axial end surface of the permanent magnet 3, and the inner peripheral wall surface of the magnet insertion hole 2d and the inner peripheral surface of the permanent magnet 3 are in close contact with each other. Each of the gaps 7 is filled with the resin 5.

  As shown in FIGS. 2A and 2B, shafts of the same size for inserting the rotor shaft 4 are inserted into the center portions of the second plate-like magnetic member 2a and the first plate-like magnetic member 2b. An insertion hole 4a is provided. Further, as shown in FIG. 2B, magnet insertion holes 2d for inserting the permanent magnets 3 are provided in the vicinity of the outer peripheral portion of the first plate-like magnetic member 2b for the number of magnetic poles. Further, as shown in FIG. 2A, in the vicinity of the outer peripheral portion of the second plate-like magnetic member 2a, the outer periphery of the magnet insertion hole 2d has the same shape and the central portion in the circumferential direction of the inner peripheral wall surface 2d2. A resin injection hole 2d4 having a protrusion 2c protruding toward the outer peripheral wall 2d1 is formed.

  As shown in FIGS. 3A and 3B, the positions of the shaft insertion holes 4a of the first plate-like magnetic member 2b and the second plate-like magnetic member 2a are matched with each other, and the magnet-insertion holes are used. The first plate-like magnetic members 2b and the second plate-like magnetic member 2a and the first plate-like magnetic member 2b so that the positions of the holes 2d and the positions of the magnet insertion hole 2d and the resin injection hole 2d4 coincide with each other. Is fixed by a method such as unshown caulking (not shown) to form the laminated iron core 2.

  As shown by the arrows in FIG. 4B, the permanent magnet 3 is inserted from the opening of the magnet insertion hole 2d opposite to the end on the second plate-like magnetic member 2a side. At this time, the permanent magnet 3 shown in FIG. 8 is configured such that the radius of curvature of the outer peripheral side surface 3b is larger than the radius of curvature of the outer peripheral wall surface 2d1 in the magnet insertion hole 2d of the laminated core 2. As shown in FIG. 4A, a gap 7 is generated between the outer peripheral side surface 3 b of the permanent magnet 3 and the outer peripheral wall surface 2 d 1 in the magnet insertion hole 2 d of the laminated core 2. Further, since the radius of curvature of the inner peripheral side surface 3a of the permanent magnet 3 is configured to be substantially equal to the radius of curvature of the inner peripheral side wall surface 2d2 of the magnet insertion hole 2d in the laminated core 2, the permanent magnet 3 The gap between the inner peripheral side surface 3a and the laminated iron core 2 is only provided for the insertion of the permanent magnet 3, and the gap is very small compared to the outer peripheral side surface 3b. It has become. Further, as shown in FIG. 4A, a gap 7 is formed between the circumferential end surface 3c in the circumferential direction S of the permanent magnet 3 and the wall surface 2d3 at the circumferential end of the magnet insertion hole 2d. The length dimension in the circumferential direction S of the permanent magnet 3 is formed so as to have a portion smaller than the length dimension in the circumferential direction of the magnet insertion hole 2d. Further, as shown in FIG. 4B, the length of the permanent magnet 3 in the axial direction Z is configured to be smaller than the length of the magnet insertion hole 2d in the laminated core 2 in the axial direction Z. A gap 7 is formed between the plate surface of the protrusion 2 c of the second plate-like magnetic member 2 a and the axial end surface of the permanent magnet 3 in the axial direction Z. As shown in FIG. 1, all the gaps 7 are filled with the resin 5, and the permanent magnet 3 is securely fixed to the laminated core 2 in a well-balanced manner.

  The difference between the length in the axial direction Z of the permanent magnet 3 and the length in the axial direction Z of the laminated core 2 is set to be larger than the thickness of one second plate-like magnetic member 2a. When inserted into the magnet insertion hole 2d of the laminated core 2, the permanent magnet 3 does not protrude from the end face of the laminated core.

Next, a manufacturing method of the magnet-embedded rotor according to the first embodiment will be described.
The first plate-like magnetic member 2b and the second plate-like magnetic member 2a shown in FIG. 2 are formed by a pressing device (first step), and as shown in FIG. 3, the required number of first plate-like magnetic members 2b. And the 2nd plate-shaped magnetic member 2a is laminated | stacked (2nd process), and the permanent magnet 3 is inserted in 2d for magnet insertion holes (3rd process).

  Next, the laminated iron core 2 in which the permanent magnet 3 is inserted is set in a molding die for resin filling. As shown in FIG. 5, the laminated core 2 is set on the lower die 9 so that the plate surface of the second plate-like magnetic member 2a is on the upper die 8 side. Thereafter, although not shown, the plate surface of the second plate-like magnetic member 2a of the laminated iron core 2 comes into contact with the upper die 8 by the clamping mechanism of the molding machine to which the upper die 8 and the lower die 9 are attached. The upper and lower plate surfaces 2 and the upper die 8 and the lower die 9 are in close contact with each other, pressurized by the clamping force of the molding machine, and the resin is injected into the gap 7 and solidified (fourth step).

  In FIG. 5, the resin injected from the molding machine passes through the resin flow path 8 a in the upper mold 8 of the molding die and reaches the resin injection port position 6, from which the resin is injected into the magnet insertion hole 2 d of the laminated core 2. The gap 7 is filled. As shown in FIG. 6, the resin inlet position 6 of the upper mold 8 of the molding die is the central portion in the circumferential direction S of the magnet insertion hole 2d and the radial center position of the magnet insertion hole 2d ( Center line) 2e is arranged on the outer peripheral side.

  Here, the flow of the resin in the laminated core 2 will be described. As shown in FIG. 9, the resin flow A flows from the resin injection port position 6 into the resin injection hole 2 d 4 of the second plate-like magnetic member 2 a of the laminated core 2. As shown in FIG. 6, since the resin injection port position 6 is provided closer to the outer peripheral side than the center line 2e of the magnet insertion hole 2d, the resin flowing into the resin injection hole 2d4 is projected 2c. Is guided to the outer peripheral side of the permanent magnet 3 and flows into the gap 7 between the outer peripheral side surface 3b of the permanent magnet 3 and the outer peripheral wall surface 2d1 of the magnet insertion hole 2d of the laminated core 2 as in the resin flow B. Stream C proceeds and eventually fills the entire gap 7. Since the gap between the inner peripheral side surface 3a of the permanent magnet 3 and the wall surface 2d2 on the inner peripheral side of the magnet insertion hole 2d is small, the gap 7 between the outer peripheral side surface 3b of the permanent magnet 3 and the laminated core 2 is filled with resin. Then, as in the resin flow D, the resin is a gap between the resin injection hole 2d4 of the second plate-like magnetic member 2a and the plate surface of the second plate-like magnetic member 2a and the axial end surface 3d of the permanent magnet 3. Reach 7. In addition, since there is no gap between the inner peripheral side surface 3a of the permanent magnet 3 and the laminated core 2, or there is no gap, the inner peripheral side surface 3a of the permanent magnet 3 is laminated even if the resin flows like the resin flow D. Resin does not flow between the iron core 2.

  As described above, the resin flows in the laminated core 2 in the order of A, B, C, and D, and the resin flows into and fills the gap 7 between the outer peripheral side surface 3b of the permanent magnet 3 and the laminated core 2. The permanent magnet 3 is pressed against the inner peripheral wall surface 2d2 in the magnet insertion hole 2d by the resin injection pressure during the flow and filling of the resin, and the resin is solidified in this state. The iron core 2 is always fixed at a stable position.

  Further, as shown in FIG. 10, the resin flow A becomes the resin flow F from the resin inlet position 6, and the resin flowing into the axial end surface 3 d of the permanent magnet 3 is the circumferential end surface 3 c of the permanent magnet 3. And the gap 7 between the circumferential wall end 2d3 of the magnet insertion hole 2d is also poured and filled, and the permanent magnet 3 is more firmly fixed to the magnet insertion hole 2d of the laminated core 2.

  After the permanent magnet 3 is fixed in the magnet insertion hole 2d of the laminated core 2 by resin filling, the laminated core 2 is taken out from the molding die, and the shaft 4 is inserted and fixed in the shaft insertion hole 4a at the center. The embedded magnet rotor 1 shown in FIG. 1 is completed.

  According to the first embodiment of the present invention, the permanent magnet 3 is always fixed while pressed against the wall surface 2d2 on the inner peripheral side of the magnet insertion hole 2d. 2, the position of the permanent magnet 3 is stabilized, the balance of the rotor can be improved, and it is not necessary to provide a hole for resin injection or the like in the laminated core 2. The increase in magnetoresistance is eliminated.

  As shown in FIG. 7, the radius of curvature of the inner peripheral side surface 3a of the permanent magnet 3 is made smaller than the radius of curvature of the inner peripheral wall surface 2d2 of the magnet insertion hole 2d so that the outer peripheral side surface 3b of the permanent magnet 3 The radius of curvature is configured to be substantially the same as the radius of curvature of the wall surface 2d1 on the outer peripheral side of the magnet insertion hole 2d, and the resin injection port position 6 is at the circumferential center of the magnet insertion hole 2d and in the radial direction. The permanent magnet 3 is disposed at a position on the inner peripheral side from the center position (center line) 2e and filled with a resin in the gap 7 in the magnet insertion hole 2d in the same manner as in the first embodiment, so that the permanent magnet 3 is caused by the injection pressure of the resin. It can also be fixed by pressing against the wall surface 2d1 on the outer peripheral side of the magnet insertion hole 2d. Also in this case, the position of the permanent magnet 3 in the laminated iron core 2 can be fixed in a stable state.

  In the first embodiment, the example in which the permanent magnet 3 and the magnet insertion hole 2d have a curvature has been described. However, the permanent magnet 3 and the magnet insertion hole 2d may have a shape having no curvature. 7 and 9, a gap 7 is provided between the outer peripheral side surface 3b of the permanent magnet 3 and the outer peripheral wall surface 2d1 of the magnet insertion hole 2d so that the inner peripheral side surface 3a of the permanent magnet 3 and the magnet insertion hole are inserted. There is no gap between the inner peripheral wall surface 2d2 of the hole 2d, and the resin injection port position 6 is located at the center in the circumferential direction of the magnet insertion hole 2d and from the radial center position (center line) 2e. A gap 7 is provided between the inner peripheral side surface 3a of the permanent magnet 3 and the inner peripheral side wall surface 2d2 of the magnet insertion hole 2d so that the outer peripheral side surface 3b of the permanent magnet 3 and the magnet are inserted. There is no gap between the outer peripheral wall surface 2d1 of the use hole 2d, and the resin injection port position 6 is located at the circumferential center of the magnet insertion hole 2d and from the radial center position (center line) 2e. What is necessary is just to arrange | position in the position of an outer peripheral side.

  The magnet-embedded rotor and the manufacturing method thereof according to the present invention can be effectively used for a motor for a vehicle such as an automobile.

1 magnet embedded rotor, 2 laminated iron core, 2a second plate-like magnetic member,
2b 1st plate-shaped magnetic member, 2c protrusion, 2d hole for magnet insertion, 2d1 outer peripheral wall surface,
2d2 inner wall surface, 2d3 circumferential wall surface, 2d4 resin injection hole,
2e radial center position (center line) of magnet insertion hole, 3 permanent magnet, 3a inner peripheral side surface,
3b outer peripheral side surface, 3c circumferential end surface, 3d axial end surface, 4 shaft,
4a Shaft insertion hole, 5 resin, 6 resin inlet position, 7 gap, 8 upper mold,
8a Resin channel, 9 Lower mold.

Claims (6)

The first plate-like magnetic member is laminated to form a cylindrical shape, and has a plurality of magnet insertion holes formed in the vicinity of the outer periphery of the cylindrical shape with a predetermined interval in the circumferential direction and penetrating in the axial direction. In a magnet-embedded rotor having a laminated core having a shaft insertion hole for inserting a shaft in the central portion and a permanent magnet fitted and inserted into each of the magnet insertion holes,
At least one second plate-like magnetic member in which a resin injection hole communicating with each of the magnet insertion holes is formed on one end side in the axial direction of the laminated core is laminated,
The second plate-like magnetic member includes a protrusion protruding from the inner peripheral wall surface of the resin injection hole,
The permanent magnet has a circumferential length and a radial length shorter than the circumferential length and the radial length of the plurality of magnet insertion holes, and a wall surface at a circumferential end of the magnet insertion hole. Between the peripheral end surface of the permanent magnet and between the outer peripheral wall surface of the magnet insertion hole and the outer peripheral side surface of the permanent magnet or between the inner peripheral wall surface of the magnet insertion hole and the permanent magnet. A gap is formed between the inner peripheral side surface,
A magnet-embedded rotor, wherein the gap is filled with resin. 2. The magnet-embedded rotor according to claim 1, wherein the protrusion protrudes in a radial direction from a circumferential central portion of the inner peripheral wall surface of the resin injection hole. Each of the magnet insertion holes and the permanent magnet has an arc shape protruding outward in the radial direction,
The curvature radius of the outer peripheral side surface of the permanent magnet is larger than the curvature radius of the outer peripheral wall surface of the magnet insertion hole, and the curvature radius of the inner peripheral side surface of the permanent magnet is the curvature of the inner wall surface of the magnet insertion hole. 3. The embedded magnet rotor according to claim 2, wherein the rotor is substantially the same as the radius. The first plate-like magnetic member is laminated to form a cylindrical shape, and is formed in the vicinity of the outer periphery of the cylindrical shape with a predetermined interval in the circumferential direction and penetrating in the axial direction, and projecting radially outward. In a method of manufacturing a magnet-embedded rotor having a laminated iron core having a plurality of magnet insertion holes, and a plurality of permanent magnets that are inserted into the respective magnet insertion holes and project radially outward. ,
At least one second plate-like magnetic member in which a resin injection hole communicating with each of the magnet insertion holes is laminated on one end side in the axial direction of the laminated iron core, and the second plate-like magnetic member includes A protrusion protruding in the radial direction from the circumferential central portion of the inner wall surface of the resin injection hole is formed,
The permanent magnet has a portion whose circumferential length is shorter than the circumferential length of each of the magnet insertion holes, and between the circumferential end surface of each of the magnet insertion holes and the circumferential end surface of the permanent magnet. Forming a void in the
A gap is formed between the outer peripheral side surface of the permanent magnet and the outer peripheral side wall surface of the magnet insertion hole,
The resin injection port position of the mold for injecting the resin into each of the gaps is arranged on the outer peripheral side from the radial center of the magnet insertion hole, and the resin is injected into the gap, so that the permanent injection pressure of the resin is obtained. A method for manufacturing a magnet-embedded rotor, wherein an inner peripheral side surface of a magnet is pressed against a wall surface on the inner peripheral side of the magnet insertion hole. The first plate-like magnetic member is laminated to form a cylindrical shape, and is formed in the vicinity of the outer periphery of the cylindrical shape with a predetermined interval in the circumferential direction and penetrating in the axial direction, and projecting radially outward. In a method of manufacturing a magnet-embedded rotor having a laminated iron core having a plurality of magnet insertion holes, and a plurality of permanent magnets that are inserted into the respective magnet insertion holes and project radially outward. ,
Laminating at least one second plate-like magnetic member having a resin injection hole communicating with each of the magnet insertion holes on one end side in the axial direction of the laminated core;
The permanent magnet has a portion whose circumferential length is shorter than the circumferential length of each of the magnet insertion holes, and between the circumferential end surface of each of the magnet insertion holes and the circumferential end surface of the permanent magnet. Forming a void in the
The curvature radius of the outer peripheral side surface of the permanent magnet is made larger than the curvature radius of the outer peripheral wall surface of the magnet insertion hole, and a gap is formed between the outer peripheral side surface of the permanent magnet and the outer peripheral wall surface of the magnet insertion hole. Forming the radius of curvature of the inner peripheral side surface of the permanent magnet substantially the same as the radius of curvature of the inner peripheral wall surface of the magnet insertion hole, and setting the inner peripheral side surface of the permanent magnet to the inner peripheral side of the magnet insertion hole. The resin injection port position of the mold for injecting the resin into each of the gaps is arranged on the outer peripheral side from the radial center of the magnet insertion hole, and the resin is injected into the gap. A method of manufacturing a magnet-embedded rotor, wherein an inner circumferential side surface of the permanent magnet is pressed against a wall surface on the inner circumferential side of the magnet insertion hole with an injection pressure of The first plate-like magnetic member is laminated to form a cylindrical shape, and is formed in the vicinity of the outer periphery of the cylindrical shape with a predetermined interval in the circumferential direction and penetrating in the axial direction, and projecting radially outward. In a method of manufacturing a magnet-embedded rotor having a laminated iron core having a plurality of magnet insertion holes, and a plurality of permanent magnets that are inserted into the respective magnet insertion holes and project radially outward. ,
Laminating at least one second plate-like magnetic member having a resin injection hole communicating with each of the magnet insertion holes on one end side in the axial direction of the laminated core;
The permanent magnet has a portion whose circumferential length is shorter than the circumferential length of each of the magnet insertion holes, and is between the circumferential wall surface of each of the magnet insertion holes and the circumferential end surface of the permanent magnet. Forming a void in the
The radius of curvature of the inner peripheral side surface of the permanent magnet is made smaller than the radius of curvature of the inner peripheral side wall surface of the magnet insertion hole, and the inner peripheral side surface of the permanent magnet and the inner peripheral side wall surface of the magnet insertion hole An air gap is formed between them, and the radius of curvature of the outer peripheral side surface of the permanent magnet is substantially the same as the radius of curvature of the wall surface of the outer peripheral side of the magnet insertion hole, so that the outer peripheral side surface of the permanent magnet is the outer peripheral side of the magnet insertion hole. The resin injection port position of the mold for injecting resin into each of the gaps is arranged on the inner peripheral side from the radial center of the magnet insertion hole, and the resin is injected into the gap, A manufacturing method of a magnet-embedded rotor, wherein an outer peripheral side surface of the permanent magnet is pressed against a wall surface on an outer peripheral side of the magnet insertion hole by a resin injection pressure.

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