Rotor

Abstract

To provide a rotor capable of simplifying a structure by omitting a rotary shaft in an inner diameter portion of a rotor core.SOLUTION: A rotor comprises: a shaft 21 supported rotatably; a rotor core 22 provided at one end of the shaft 21; and magnets 23 accommodated in magnet holes 45 provided in the rotor core 22. The magnet 23 is fixed to the shaft 21 without the rotor core 22 therebetween.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a rotor. [Background technology]

[0002] Patent Document 1 describes a rotor for a rotating electric machine that includes a rotor core made of laminated core sheets made of electromagnetic steel plates and magnets embedded in magnet holes formed in the rotor core. The rotor core of this rotor has a rotating shaft fitted and fixed in a rotating shaft hole in the center. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2015-192590 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, the rotor rotates due to the magnetic field generated by the stator, and the rotor core and magnets rotate under load. For this reason, it has been difficult to simplify the design by eliminating the rotating shaft that is fitted into the rotating shaft hole of the rotor core and fixed to the inner diameter part of the rotor core.

[0005] The present invention has been made in consideration of the above circumstances, and has an object to provide a rotor that can simplify the structure by eliminating the rotation shaft in the inner diameter portion of the rotor core. [Means for solving the problem]

[0006] In order to achieve the above object, the rotor of the present invention comprises: A rotatably supported shaft; At one end of the shaft Through the connection A rotor core provided with the rotor core; a magnet housed in a magnet hole provided in the rotor core; having The magnet is not connected to the rotor core. The end of the magnet The above Connecting part To By crimping or welding To be fixed, Rotor.

[0007] According to the rotor having this configuration, the magnets housed in the magnet holes of the rotor core are rotated without passing through the rotor core. Connecting part To By crimping or welding This directly fixes the magnet to the magnet. The load acting as a rotational force on the magnet due to its own weight and rotating magnetic force is Shaft through the connection Therefore, the rotor core can be supported by a simple support structure capable of supporting only its own weight, and for example, a support structure that supports the inner diameter side with a rotating shaft fitted in the center can be omitted. Structure This makes it possible to realize this structure. Effect of the Invention

[0008] According to the present invention, it is possible to provide a rotor that can simplify the structure by eliminating the rotation shaft at the inner diameter portion of the rotor core. [Brief description of the drawings]

[0009] [Figure 1] 1 is a cross-sectional view taken along an axial direction of a motor including a rotor according to an embodiment of the present invention. [Diagram 2] 13 is a cross-sectional view taken along the axial direction of a motor, illustrating a rotor according to a modified example. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view taken along the axial direction of a motor including a rotor according to an embodiment of the present invention.

[0011] As shown in FIG. 1, a rotor 10 according to this embodiment constitutes a motor 1 together with a stator 11. The outer periphery of the rotor 10 is covered by the stator 11. The rotor 10 is attached to a shaft 31 and, A connecting portion 21; It includes a rotor core 22 and a magnet 23.

[0012] Connecting part 21 is shaft 31 One end is fixed at shaft The shaft 31 is supported by a case 33 via a bearing 32. 31 is rotatably supported relative to the case 33.

[0013] Connecting part 21 is shaft The hub 36 is a plate-shaped hub provided on the outer periphery of the cylindrical portion 35. Connecting part 21 may be made of a non-magnetic material.

[0014] Hub 36 is Connecting part 21, and an annular fixed plate portion 38 fixed to the outer periphery of the support plate portion 37. The support plate portion 37 is fitted into the fixed plate portion 38, and the support plate portion 37 and the fixed plate portion 38 are fixed by welding. The fixed plate portion 38 is formed from a plate material such as stainless steel, for example.

[0015] The rotor core 22 is formed by laminating a plurality of electromagnetic steel sheets 41 made of a soft magnetic material, and is formed in a cylindrical shape. The rotor core 22 has a plurality of magnet holes arranged along the axial direction. 45 These magnet holes are formed. 45 are formed at intervals in the circumferential direction. Connecting part The inner periphery at the end opposite to 21 is rotatably supported by a support (not shown) via a bearing 42 .

[0016] The magnets 23 are permanent magnets, and are inserted and accommodated in the magnet holes 45 formed in the rotor core 22. The magnets 23 accommodated in the magnet holes 45 have their ends 23a inserted into the magnet holes 45 without passing through the rotor core 22. Connecting part The magnet 23 is fixed to the fixed plate portion 38 of the magnet 21 by a fixing portion 46. Connecting part The magnet 23 is fixed to the fixing plate portion 38 of the magnet 21 by crimping the end portion 23a. Connecting part Alternatively, the fixing plate 38 of the support 21 may be fixed by welding.

[0017] The stator 11 provided around the rotor 10 is cylindrical, and a small gap is provided between the rotor 10 and the stator 11. The stator 11 is composed of a stator yoke 51 and a stator coil 52 wound around teeth (not shown) of the stator yoke 51. The stator coil 52 is, for example, a three-phase coil.

[0018] In the motor 1 having the above configuration, a rotating magnetic field is generated by passing a three-phase AC current through the stator coil 52 of the stator 11. Then, in the rotor 10, the magnets 23 provided in the rotor core 22 are subjected to a load that becomes a rotational force due to the magnetic field. The load that these magnets 23 are subjected to is as follows: Rotor The core 22 is not interposed between the fixing portion 46 and the fixing portion 46. Connecting part 21 directly, Connecting part twenty one Through shaft 31 A rotational force is output from

[0019] At this time, the rotor core 22 receives a reluctance torque from each electromagnetic steel sheet 41 due to the rotating magnetic field generated by the stator 11. The reluctance torque received by the electromagnetic steel sheet 41 is transmitted to the magnet 23 and passes through the magnet 23. Connecting part twenty one Through shaft 31 is transmitted directly to

[0020] In this way, according to the rotor 10 of this embodiment, the magnets 23 housed in the magnet holes 45 of the rotor core 22 are rotated without passing through the rotor core 22. Connecting partAs a result, the load acting as a rotational force on the magnet 23 due to its own weight and rotational magnetic force is Connecting part twenty one Through shaft 31 The load and the weight of the rotor core 22 are directly transmitted to the rotor core 22, and the load and the weight of the rotor core 22 are prevented from being applied to the rotor core 22. Therefore, the rotor core 22 can be supported by a simple support structure capable of supporting only the weight of the rotor core 22. For example, the support structure for supporting the inner diameter side by a rotating shaft fitted in the center can be omitted. Structure This makes it possible to realize this structure.

[0021] Here, the attachment strength between rotor core 22 and magnets 23 is sufficient to withstand the reluctance torque received by one electromagnetic steel sheet 41. This attachment strength is sufficiently smaller than the combined load of magnets 23 generated by the rotating magnetic field and the weight of magnets 23. Therefore, the attachment structure of magnets 23 housed in magnet holes 45 to rotor core 22 can also be simplified.

[0022] The rotor 10 of the above embodiment is configured as follows: Connecting part The rotor 21 is not limited to having the hub 36 composed of the support plate portion 37 and the fixed plate portion 38 fixed to the outer periphery of the support plate portion 37.

[0023] FIG. 2 is a cross-sectional view taken along the axial direction of a motor, illustrating a rotor according to a modified example. As shown in FIG. 2, the rotor 10A has a hub 36 that is made up of a support plate portion 37 and a fixed plate portion 38 fixed to the outer periphery of the support plate portion 37. Connecting part Instead of 21, a hub 36A formed in a plate shape is integrally formed with the cylindrical portion 35. Connecting part 21A. The magnets 23 housed in the magnet holes 45 of the rotor core 22 are directly fixed to the hub 36A by, for example, crimping or welding. With this rotor 10A, the fixing plate portion 38 can be omitted, and also the process of fixing the fixing plate portion 38 to the support plate portion 37 by welding or the like can be made unnecessary. [Explanation of symbols]

[0024] 10,10A rotor twenty one ,21A Connecting part 22 Rotor core 23 Magnet 31 Shaft 45 Magnet hole

Claims

[Claim 1] A rotatably supported shaft; A rotor core provided at one end of the shaft via a connecting portion; a magnet housed in a magnet hole provided in the rotor core; having the magnet is fixed to the connecting portion by crimping or welding an end of the magnet to the connecting portion without using the rotor core; The rotor core has an inner periphery at an end opposite to the connecting portion, the inner periphery being rotatably supported on a support by a bearing. Rotor.

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