JP6126955B2 - Rotor - Google Patents

Description

  The present invention relates to a rotor built in a motor.

  As a rotor built in a brushless motor, there is one in which a magnet is sealed with resin on laminated electromagnetic steel sheets. The rotor is a component that is provided on the outer periphery of the rotating shaft and rotates. For this reason, if the center of gravity of the rotor does not coincide with the center of the rotating shaft, the load applied to the rotating shaft increases. For this reason, it is important to arrange the magnet at an accurate position in the electromagnetic steel sheet. As a technique related to such a rotor, there is a technique disclosed in Patent Document 1. Patent document 1 is demonstrated based on the following figure.

  As shown in FIG. 9, to manufacture the rotor 100, the magnet 103 is set in the cylindrical hole 101 a of the electromagnetic steel plate 101 set in the lower die 111, and the electromagnetic steel plate 101 is pressed by the upper die 112. Then, the sealing resin 105 is poured from the upper mold 112 into the cylindrical hole 101a.

  At this time, the sealing resin 105 is poured from the end of the cylindrical hole 101a. As a result, the magnet 103 is pressed against the end of the cylindrical hole 101a opposite to the side where the sealing resin 105 is supplied by the sealing resin 105, and the magnet 103 is sealed at this portion. In other words, the magnet 103 is positioned so as to be pressed against the opposite end of the cylindrical hole 101a by the poured sealing resin 105. However, according to the method of manufacturing the rotor 100, the following problems may occur.

  As shown in FIGS. 10A and 10B, it is difficult to press the lower end of the magnet 103 depending on the flow rate and pressure of the sealing resin 105 to be poured. Then, the lower end may move in the cylindrical hole 101a. That is, the magnet 103 cannot be disposed at a predetermined location.

  It is desirable to provide a technique that can position the magnet with certainty.

Japanese Patent No. 4850528

  This invention makes it a subject to provide the technique which can position a magnet reliably.

According to the invention of claim 1, laminated electromagnetic steel sheets;
A rod-shaped magnet inserted in a cylindrical hole for magnet insertion provided in these electromagnetic steel sheets,
A positioning member for positioning the magnet so that the magnet contacts a part of the cylindrical surface of the cylindrical hole;
A sealing resin and the magnet is positioned in the positioning member is filled in the gap between the cylindrical hole, Ri Tona,
The positioning member is formed in a substantially U shape along the three surfaces of the magnet, and includes a bottom surface that is in contact with one surface of the cylindrical hole and two tip surfaces that are in contact with the surface facing the one surface. And having
The one surface of the magnet, the two horns rotor that is formed substantially flush to the distal end surface is provided.

According to the present invention by claim 2, the electromagnetic steel plates stacked,
A rod-shaped magnet inserted in a cylindrical hole for magnet insertion provided in these electromagnetic steel sheets,
A positioning member for positioning the magnet so that the magnet contacts a part of the cylindrical surface of the cylindrical hole;
The sealing resin filled in the gap between the magnet positioned by the positioning member and the cylindrical hole,
A rotor is provided in a part of the positioning member. The rotor is formed in a concave shape toward the magnet and can flow the sealing resin .

According to the present invention by claim 3, the electromagnetic steel plates stacked,
A rod-shaped magnet inserted in a cylindrical hole for magnet insertion provided in these electromagnetic steel sheets,
A positioning member for positioning the magnet so that the magnet contacts a part of the cylindrical surface of the cylindrical hole;
The sealing resin filled in the gap between the magnet positioned by the positioning member and the cylindrical hole,
The magnet is connected so that a part of a plurality of permanent magnets abut each other ,
These rotors the that have positioning member is attached to the joint of the magnets are provided.

As described in claim 4, preferably, the first extension portion extends integrally from the lower end of the positioning member to the lower end of the magnet,
A second extending portion that covers the lower end surface of the magnet is integrally formed from the lower end of the first extending portion.

In the inventions according to claims 1 to 3 , the magnet is positioned by the positioning member. That is, by attaching the positioning member, the magnet can be arranged at an accurate position in the cylindrical hole. In addition, since the positioning member is in contact with a part of the cylindrical surface of the cylindrical hole during the supply of the sealing resin, the movement of the magnet is prevented. Thereby, a magnet can be sealed in the exact position in an electromagnetic steel plate. Thereby, the deviation of the center of gravity of the rotor from the center of the rotating shaft can be minimized, and the rotating shaft can be smoothly rotated.

In the invention which concerns on Claim 2 , the flow-path part is formed in the positioning member . Thereby, the resin for sealing can be reliably filled in the whole cylindrical hole.

  In the invention which concerns on Claim 3, the positioning member is attached to the joint of several permanent magnets. Thereby, it is suppressed that a permanent magnet moves from a joint. By suppressing the movement of the easily movable part, the magnet can be more securely fixed at a predetermined place.

  In the invention which concerns on Claim 4, the 2nd extension part which covers the lower end surface of a magnet is formed. By adjusting the thickness of the second extending portion, the magnet can be positioned also in the axial direction (height direction) of the electromagnetic steel sheet. Since the second extending portion is formed integrally with the positioning member, the magnet can be positioned in the circumferential direction and the axial direction of the electromagnetic steel sheet by one member. A resin member is provided in advance on the magnet end portion serving as the bottom surface. Thereby, an end surface board can be set thinly. Further, since the end resin serves as a cushion, a low cost material can be used for the end face plate.

It is a perspective view of the rotor which concerns on this invention. It is a perspective view of the magnet and the positioning member by Example 1 of this invention. It is a figure explaining the method of forming a positioning member. It is a figure explaining the form which inserted the magnet in the cylindrical hole. It is a figure explaining the state by which sealing resin was filled into the cylindrical hole. It is a principal part enlarged view of a rotor. It is a perspective view of the magnet and positioning member by Example 2 of this invention. It is a perspective view of the magnet and positioning member by Example 3 of this invention. It is a figure explaining the basic composition of the conventional technology. It is a figure explaining the problem of the prior art.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

First, Embodiment 1 of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the rotor 10 is inserted into each of the electromagnetic steel plates 12 that are laminated and have the cylindrical holes 11 for inserting magnets, and the cylindrical holes 11 of these electromagnetic steel plates 12. The rod-shaped magnet 15, the positioning member 20 that positions the magnet 15 so that these magnets 15 come into contact with part of the cylindrical surface of the cylindrical hole 11, and the gap between the magnet 15 and the cylindrical hole 11 are filled. And a sealing resin 17. The relationship between the magnet 15 and the positioning member 20 will be described with reference to FIG.

  As shown in FIG. 2, the magnet 15 is formed by connecting two rectangular parallelepiped permanent magnets 15a and 15a. A positioning member 20 is formed at the joint between the permanent magnets 15a and 15a. The positioning member 20 is a resin part integrally formed with the magnet 15 by a resin molding method.

  The positioning member 20 protrudes away from the magnet 15 at a portion corresponding to the bottom of the main body portion 21 and is formed in a substantially U shape along the three surfaces of the magnet 15. The protrusion 22 extending along the direction is integrally formed. The protrusion 22 is formed in a substantially semicircular column shape.

  Part of the main body 21 is formed in a concave shape toward the magnet 15, and channel portions 21 a and 21 a are formed for flowing sealing resin (FIG. 1, reference numeral 17). The resin molding method for forming the positioning member 20 on the periphery of the magnet 15 will be described in detail with reference to FIG.

  As shown in FIG. 3B, which is a cross-sectional view taken along the line 3b-3b in FIGS. 3A and 3A, the magnet 15 is first set on the lower mold 31 and the upper mold 32 is lowered.

  As shown in FIG. 3D, which is a cross-sectional view taken along line 3d-3d in FIGS. 3C and 3C, a thermosetting resin is formed in the cavity CA formed by lowering the upper mold 32. Supply. In this way, the positioning member 20 is integrally formed on the periphery of the magnet 15. Next, the magnet 15 and the positioning member 20 are sealed inside the electromagnetic steel plate (FIG. 1, reference numeral 12). Details will be described with reference to FIGS.

  As shown in FIG. 4A, the electromagnetic steel plate 12 is set on the upper surface of the lower mold 35, and the magnet 15 in which the positioning member 20 is integrated is inserted into the cylindrical hole 11.

  As shown in FIG. 4B, which is a cross-sectional view taken along line 4b-4b of FIG. 4A, the cylindrical hole 11 has a substantially rectangular shape, and a hole recess 11a that is partially recessed in a semicircular shape. Is formed. The front end surface 21 b, the bottom surface 21 c, and the protrusion 22 of the main body 21 of the positioning member 20 are in contact with the cylindrical surface 11 b of the cylindrical hole 11. In particular, the protrusion 22 is fitted in the hole recess 11a.

  As shown in FIG. 5A, the upper mold 36 is lowered to the upper surface of the electromagnetic steel sheet 12. The sealing resin 17 made of thermosetting resin is supplied from the lowered upper mold 36 to the cylindrical hole 11.

  The gap between the positioning member 20 (magnet 15) and the cylindrical hole 11 is filled with the sealing resin 17, as shown in FIG. 5B, which is a cross-sectional view taken along the line 5b-5b in FIG. It is done. Channel portions 21 a and 21 a are formed in the main body portion 21 of the positioning member 20. Thereby, the sealing resin 17 can be reliably filled in the entire cylindrical hole 11.

  As shown in FIG. 6, the magnet 15 is attached with a positioning member 20 that positions the magnet 15 so as to contact a part of the cylindrical surface 11 b of the cylindrical hole 11. By attaching the positioning member 20, the magnet 15 can be disposed at an accurate position in the cylindrical hole 11. In addition, since the positioning member 20 is in contact with a part of the cylindrical surface 11b of the cylindrical hole 11 during the supply of the sealing resin 17, the movement of the magnet 15 is prevented. Thereby, the magnet 15 can be sealed at an accurate position in the electromagnetic steel sheet 12.

  In addition, the positioning member 20 is a resin component integrally formed with the magnet 15 by a resin molding method. Compared with the case where a separate resin component is attached to the magnet, the attaching step is not necessary, and the positioning member 20 can be firmly fixed to the magnet 15. While being able to attach easily, the shift | offset | difference of the positioning member 20 at the time of sealing of the magnet 15 can be suppressed.

  Further, the positioning member 20 is formed with a protrusion 22, and the cylindrical hole 11 is formed with a hole recess 11 a into which the protrusion 22 is fitted. By adopting a configuration in which the protrusion 22 is fitted into the hole recess 11a, it is possible to more reliably prevent the magnet 15 from being displaced while being positioned at an accurate position.

  In order to achieve this effect, a protrusion projecting toward the other is formed on one of the positioning member 20 or the cylindrical hole 11, and the other of the positioning member 20 or the cylindrical hole 11 is It is necessary that a recess into which the protrusion 22 is fitted is formed. That is, this arrangement may be reversed for the protrusion 22 and the hole recess 11a.

  Referring also to FIG. 2, the positioning member 20 is attached to the joint P between the plurality of permanent magnets 15a, 15a. Thereby, it is suppressed that the permanent magnet 15a moves from the joint P as a starting point. By suppressing the movement of the easily movable part, the magnet 15 can be more securely fixed at a predetermined place.

Next, a second embodiment of the present invention will be described with reference to the drawings.
FIG. 7 shows magnets and positioning members used in the rotor of Example 2, and corresponds to FIG.

  As shown in FIG. 7, the first extension 25 extends integrally from the lower end of the positioning member 20 to the lower end of the magnet 15, and the magnet 15 integrally extends from the lower end of the first extension 25. The 2nd extension part 26 which covers the lower end surface 15b of is formed.

  The first extension part 25 and the second extension part 26 are formed integrally with the positioning member 20 by transfer molding. That is, the positioning member 20, the first extending portion 25, and the second extending portion 26 are integrally formed by a single molding. Even when the magnet 15 to which the positioning member 20, the first extending portion 25, and the second extending portion 26 are attached is used, the predetermined effect of the present invention can be obtained.

  In addition, by adjusting the thickness of the second extending portion 26, the magnet 15 can be positioned also in the axial direction (height direction) of the electromagnetic steel sheet (FIG. 1, reference electromagnetic steel sheet 12). Since the second extending portion 26 is formed integrally with the positioning member 20, the magnet 15 can be positioned in the circumferential direction and the axial direction of the electromagnetic steel sheet 12 with one member.

Next, Embodiment 3 of the present invention will be described with reference to the drawings.
FIG. 8 shows a magnet and a positioning member used in the rotor of Example 3, and corresponds to FIG.

  As shown in FIG. 8, the magnet 45 is configured by connecting four permanent magnets 15a. In this case, the positioning members 20, 50, 50 can be attached to the joints P of the permanent magnets 15a. Even in such a case, the predetermined effect of the present invention can be obtained.

  Further, it is desirable to use one positioning member 20 constituted by the main body portion 21 and the projection portion 22 and use positioning members 50 and 50 constituted only by the main body portion 21 at other portions. Since the protrusions 22 are not formed on the positioning members 50, 50, the amount of necessary resin can be reduced accordingly.

  In addition, it is desirable to attach the positioning member 20 having the protrusion 22 to the lowermost side. This is because, on the upstream side, it is relatively easy to dispose the magnet 45 at a predetermined location, while the magnet 45 easily moves in a portion near the lower end. In other words, the magnet 45 can be reliably arranged at a predetermined location by more reliably preventing the movement of the easily movable part.

  The rotor of the present invention can be used for any motor other than the motor of a hybrid vehicle. That is, the rotor according to the present invention can be employed in any motor.

  The rotor of the present invention is suitable for a motor for a hybrid vehicle.

DESCRIPTION OF SYMBOLS 10 ... Rotor 11 ... Cylindrical hole 11b ... Cylindrical surface 15, 45 ... Magnet 15a ... Permanent magnet 17 ... Sealing resin 20, 50 ... Positioning member 25 ... 1st extension part 26 ... 2nd extension part P ... joint

Claims (4)

Laminated electrical steel sheets,
A rod-shaped magnet inserted in a cylindrical hole for magnet insertion provided in these electromagnetic steel sheets,
A positioning member for positioning the magnet so that the magnet contacts a part of the cylindrical surface of the cylindrical hole;
A sealing resin and the magnet is positioned in the positioning member is filled in the gap between the cylindrical hole, Ri Tona,
The positioning member is formed in a substantially U shape along the three surfaces of the magnet, and includes a bottom surface that is in contact with one surface of the cylindrical hole and two tip surfaces that are in contact with the surface facing the one surface. And having
The one surface of the magnet, the two horns rotor that is formed substantially flush to the tip surface. Laminated electrical steel sheets,
A rod-shaped magnet inserted in a cylindrical hole for magnet insertion provided in these electromagnetic steel sheets,
A positioning member for positioning the magnet so that the magnet contacts a part of the cylindrical surface of the cylindrical hole;
The sealing resin filled in the gap between the magnet positioned by the positioning member and the cylindrical hole,
Wherein a portion of the positioning member toward said magnet is formed in a concave shape, the B over data flow path portion capable of supplying a sealing resin is formed. Laminated electrical steel sheets,
A rod-shaped magnet inserted in a cylindrical hole for magnet insertion provided in these electromagnetic steel sheets,
A positioning member for positioning the magnet so that the magnet contacts a part of the cylindrical surface of the cylindrical hole;
The sealing resin filled in the gap between the magnet positioned by the positioning member and the cylindrical hole,
The magnet is connected so that a part of a plurality of permanent magnets abut each other ,
These Carlo over data have the positioning member is attached to the joint of the magnets. A first extending portion extends integrally from the lower end of the positioning member to the lower end of the magnet,
The 2nd extension part which covers the lower end surface of the said magnet from the lower end of this 1st extension part is formed in one, The Claim 1 characterized by the above-mentioned. Rotor.

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