Rotating electric machine and manufacturing method of rotating electric machine

Abstract

Provided is a rotary electric machine comprising a rotor (11), a plurality of magnets (12), and a retainer (13), wherein the rotor (11) is composed of a laminated steel plate fixed to a rotation shaft, the plurality of magnets (12) are arranged along the circumference of the rotor (11), the retainer (13) is the same number as the magnets (12) arranged between the magnets (12), the retainer (13) is pressed into and fixed to the rotor (11) by a press-in portion (13a) extending in the radial direction of the rotation shaft, one circumferential side of the magnet (12) is positioned on the rotor (11), the other circumferential side is pressed by the retainer (13) in the circumferential direction, and both ends of the magnet (12) are pressed by the retainer (13) in the radial direction. With the above structure, a rotary electric machine is provided in which the magnets of the rotor can be fixed with high precision by simple work.

Description

Technical Field

[0001] This application relates to a rotary electric motor and a method for manufacturing the rotary electric motor. Background Technology

[0002] Previously, a technique was known in which, in a rotary electric motor in which a rotor unit with fixed magnets rotates inside a coil, multiple magnets are fixed to the rotor without the use of adhesives, but rather by means of a resin-made magnet retainer. For example, Patent Document 1 discloses a technique in which a magnet retainer insert is pre-formed into a rotor made of laminated steel plates, and the magnet is pressed in and fixed to the magnet retainer from the direction of rotation.

[0003] Furthermore, Patent Document 2 discloses a technique in which a magnet holder made of resin is fixed to a rotor, and a magnet is pressed in from the direction of rotation and fixed to a magnet receiving part formed by the magnet holder and the outer peripheral surface of the rotor.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent No. 5842365.

[0007] Patent document 2: Japanese Patent No. 5044217. Summary of the Invention

[0008] The technical problem that the invention aims to solve

[0009] However, the structure of Patent Document 1, which pre-inserts the magnet holder into the rotor, is complex and requires expensive molds for insert molding, resulting in high equipment investment and inevitable increases in product cost.

[0010] Furthermore, in the structure of Patent Document 2, which fixes the integrated magnet holder to the rotor and presses and fixes the magnet into the magnet receiving part formed by the magnet holder and the outer peripheral surface of the rotor, there will be assembly errors such as rotor installation error, magnet holder molding error, and magnet holder deformation caused by assembly. Therefore, there is a technical problem that the deviation of the magnet configuration accuracy becomes larger.

[0011] Especially when the circumferential positional accuracy of the shaft deviates, torque pulses and cogging torque will be generated, resulting in a deterioration in the performance of the rotary motor. In addition, since the magnet needs to be pressed in from the shaft direction and fixed to the magnet housing formed by the magnet cage and the outer circumferential surface of the rotor, there is a possibility of deterioration in assembly workability, scratches or rusting of the magnet and magnet cage during pressing, and a decrease in accuracy.

[0012] This application was made to solve the problems mentioned above, and its purpose is to provide a rotary motor that does not require molds for insert molding, has good assembly accuracy, and has low torque pulse and cogging torque.

[0013] Technical solutions adopted to solve technical problems

[0014] The rotary motor disclosed in this application includes: a rotor fixed to a rotating shaft; a plurality of magnets disposed on the outer periphery of the rotor; and a retainer for fixing the magnets disposed among the plurality of magnets. The rotor has a positioning part for positioning the magnets and a groove for pressing and fixing the retainer. The retainer has a pressing part for pressing into the groove and a pressing part for fixing the magnets. By pressing the pressing part into the groove, the pressing part presses and fixes the end of the magnet positioned by the positioning part.

[0015] Invention Effects

[0016] According to the rotary motor disclosed in this application, since there is no need for complex and expensive molds for insert molding, the magnet and magnet cage will not be damaged during pressing, and the assembly accuracy is good. Therefore, it can obtain the characteristics of small torque pulse and cogging torque. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of the rotary motor according to Embodiment 1.

[0018] Figure 2 This is a perspective view of the rotor, magnet, and magnet cage of the rotary electric machine according to Embodiment 1 after assembly.

[0019] Figure 3 This is a side view of the rotor, magnet, and magnet cage of the rotary electric machine according to Embodiment 1 after assembly.

[0020] Figure 4 This is a perspective view of the rotor of the rotary electric motor according to Embodiment 1.

[0021] Figure 5 This is a perspective view of the magnet of the rotary motor in Embodiment 1.

[0022] Figure 6 This is a perspective view of the magnet holder of the rotary electric motor according to Embodiment 1.

[0023] Figure 7 This is a perspective view of the rotating motor before it is fixed by the magnet holder of embodiment 1.

[0024] Figure 8 This is implementation method 1. Figure 2 A-A sectional view.

[0025] Figure 9 This is implementation method 1. Figure 3 A magnified view of section B-B.

[0026] Figure 10 This is implementation method 1. Figure 3 A magnified view of the C-C section.

[0027] Figure 11 This is a perspective view of the rotor unit of Embodiment 1.

[0028] Figure 12 This is a perspective view of the rotor, magnet, and magnet cage of the rotary electric motor according to Embodiment 2 after assembly.

[0029] Figure 13 This is a side view of the rotor, magnet, and magnet cage of the rotary electric machine according to Embodiment 2 after assembly.

[0030] Figure 14 This is a perspective view of the rotor of the rotary electric motor according to Embodiment 2.

[0031] Figure 15 This is a perspective view of the magnet holder of the rotary motor according to Embodiment 2.

[0032] Figure 16 This is implementation method 2. Figure 12 D-D sectional view.

[0033] Figure 17 This is a perspective view of the magnet holder of the rotary motor in Embodiment 2 before it is pressed in.

[0034] Figure 18 This is a perspective view of the magnet holder of the rotary motor after it has been pressed in according to Embodiment 2.

[0035] Figure 19 This is a perspective view of the rotor and rotor shaft assembly of Embodiment 3.

[0036] Figure 20 This is a perspective view of the magnet holder according to embodiment 3.

[0037] Figure 21 This is a top view of the magnet holder in Embodiment 3.

[0038] Figure 22 This is a top view of the rotor in Embodiment 3.

[0039] Figure 23 This is a perspective view of the magnet holder before it is pressed in according to embodiment 3.

[0040] Figure 24 This is a perspective view of the rotor unit in Embodiment 3. Detailed Implementation

[0041] Implementation Method 1

[0042] Hereinafter, preferred embodiments of the rotary electric motor of this application will be described with reference to the accompanying drawings. Furthermore, identical symbols will be used to denote the same content or substantial portions, and detailed descriptions thereof will be omitted. Similarly, in subsequent embodiments, repeated descriptions of structures marked with the same symbols will be omitted.

[0043] Furthermore, this application is not limited to the following description and may be appropriately modified without departing from the spirit of this application. In the following drawings, for ease of understanding, the scale of each component may sometimes differ from the actual scale. In addition, illustrations of structures unrelated to the features of this application have been omitted.

[0044] use Figures 1 to 11 The rotary motor of Embodiment 1 of this application will be described.

[0045] This embodiment shows an example of applying a rotary motor to an electric power steering system installed in a vehicle. In order to assist the steering force of the vehicle's steering system, a control device is required in addition to the rotary motor body, but the illustration of the control device is omitted. Figure 1 It is a sectional view used to illustrate the structure of a rotating electric machine.

[0046] The frame 2, which serves as the housing of the rotary motor 1, is a generally cylindrical shape with an opening on the rear side (upper side in the figure), and is made of inexpensive and lightweight aluminum alloy. The stator 3 is formed by stacking electromagnetic steel sheets and is fixed to the frame 2. A stator winding 5 is wound around the stator 3 with an insulating member 4 serving as an insulator, and terminals 6 are provided for supplying current from a control device (not shown) located on the rear side to the stator winding 5. Furthermore, a bearing 7 is fixed to the front side of the frame 2, and a bearing 9 is fixed to the rear side of the frame 2 via a bearing seat 8.

[0047] A rotor 11, formed by stacking electromagnetic steel plates, is fixed to the rotor shaft 10. Multiple magnets 12 are fixed to the outer periphery of the rotor 11 by a magnet retainer 13. The multiple magnets 12 are covered by a non-magnetic protective tube 14 to form a rotor unit 15. The rotor shaft 10 is supported by bearings 7 and 9 to enable rotation. The rotor unit 15 is configured to be surrounded in a manner separate from the stator 3.

[0048] In addition, a connector 16 for assembly with the vehicle side is provided at the front end of the rotor shaft 10 (bottom of the figure), and a rotation angle detection sensor for detecting the rotation state of the rotor 11 is provided in the omitted part of the rear side of the rotor shaft 10.

[0049] The radiator 17 of the control device (not shown) is fixed to the rear opening end of the frame 2. The control device includes a power conversion circuit having a power semiconductor that converts a DC current from the outside and a control circuit, and the required current is supplied to the stator winding 5 via the terminal 6. Thereby, a rotational force is generated in the rotor 11, and the rotor shaft 15 and, further, the joint 16 are rotated.

[0050] Next, the structure of the rotor unit 15 of the present embodiment will be described in detail.

[0051] In Figure 2 and Figure 3 FIGS. show a perspective view and a side view of the assembled state of the rotor 11, the magnet 12, and the magnet holder 13. A plurality of magnets 12 are arranged at uniform intervals on the outer periphery of the rotor 11, and the same number of magnet holders 13 as the magnets 12 are arranged between the magnets 12, and these magnet holders 13 fix and hold the magnets 12.

[0052] In Figure 4 FIG. shows a perspective view of the rotor 11. The rotor 11 is composed of laminated steel plates formed by laminating a plurality of electromagnetic steel plates in the vertical direction. In the present embodiment, the outer shape is substantially an octagonal prism shape, has eight outer peripheral surfaces 11a, and a through hole 11b for inserting the rotor shaft 10 is provided in the center. In addition, positioning protrusions 11c, 11d for defining the circumferential position of the magnet 12 and positioning protrusions 11e, 11f for defining the axial position of the magnet 12 are formed near the upper and lower ends of the outer periphery. In addition, a groove portion 11g extending in the axial direction is formed between the magnets 12.

[0053] In Figure 5 FIG. shows a perspective view of the magnet 12. The magnet 12 is, for example, a sintered magnet of the Nd-Fe-B series, and the surface is coated for rust prevention, and has a substantially fish cake shape (Japanese: slightly kamaboko shape) having a cylindrical surface 12a, a plane 12b opposite to the cylindrical surface 12a, two side surfaces 12c, 12d, and upper and lower surfaces 12e, 12f, and is arranged on the eight side surfaces of the rotor 11 at uniform intervals in the circumferential direction of the rotor shaft 10.

[0054] Next, in Figure 6The image shows a perspective view of the magnet retainer 13. The magnet retainer 13 is a molded product of a high-rigidity and elastic epoxy, PPS (polyphenylene sulfide), or PBT (polybutylene terephthalate) resin. Furthermore, it has a generally T-shaped cross-section, with a press-in portion 13a, a first contact portion 13b and a second contact portion 13c that presses against the cylindrical surface 12a of the magnet 12 in the radial direction. It also has a third contact portion 13d that presses against the side surface 12c of the magnet 12 in the circumferential direction, a non-contact portion 13e that does not contact the side surface 12d of the magnet 12, and a fourth contact portion 13f that presses against the upper surface 12e of the magnet 12 in the axial direction.

[0055] exist Figure 7 The diagram shows a perspective view prior to fixation by the magnet holders 13. Eight magnets 12 are arranged relative to the rotor 11, and the eight magnet holders 13 are simultaneously moved radially (in the direction of the arrow) to press the press-in portion 13a into the slot 11g of the rotor 11. Thus, the rotor is assembled... Figure 2 as well as Figure 3 The state shown.

[0056] Next, in Figure 8 It shows Figure 2 The AA section. Furthermore, in Figure 9 , 10 It shows Figure 3 Enlarged views of the BB and CC sections. Figure 8 As shown, the upper surface 12e of the magnet 12 is pressed by the fourth contact portion 13f of the magnet holder 13, and the lower surface 12f abuts against the positioning protrusions 11e and 11f of the rotor 11, and is thus positioned and fixed.

[0057] like Figure 9 , Figure 10 As shown, the cylindrical surface 12a of the magnet 12 is pressed by the first contact portion 13b and the second contact portion 13c of the magnet holder 13, and the flat surface 12b abuts against the outer peripheral surface 11a of the rotor 11, thus being positioned and fixed. One side 12c of the magnet 12 is pressed by the third contact portion 13d of the magnet holder 13, and the other side 12d abuts against the positioning protrusions 11c and 11d of the rotor 11, thus being positioned and fixed. At this time, the non-contact portion 13e of the magnet holder 13 is separated from the side 12d of the magnet 12 and is not pressed.

[0058] Here, the magnet retainer 13 is designed based on the pressing amount, pressing length, and material to ensure that it will not fall off the rotor 11 after pressing, thus ensuring the required retaining force. In addition, in this embodiment, the magnet retainer 13 is a resin molded product, but it can also be a casting, machined part, or stamped part made of non-magnetic metals such as aluminum or stainless steel.

[0059] Because of the above-described configuration, the magnet holder 13 does not require complex and expensive molds and can be supplied in a small and inexpensive manner. Furthermore, since the individual magnet holder 13 is pressed radially into and fixed to the rotor 11 from the rotor shaft 10, simple assembly can be performed while pressing in the magnet 12 without rubbing against the rotor 11 and the magnet holder 13.

[0060] During assembly, the magnet 12 does not require axial or circumferential movement, thus enabling simpler assembly. Furthermore, this prevents the coating of the magnet 12 from peeling off and rusting, and also prevents the magnet holder 13 from being scratched, which would compromise the magnet's configuration accuracy and holding force.

[0061] Furthermore, the magnet 12 is not affected by the component precision of the magnet cage 13 or the assembly precision of the magnet cage 13 and the rotor 11. It is fixed with high precision only by the component precision of the rotor 11. Therefore, a rotary motor with good characteristics that suppresses the generation of torque pulses and cogging torque can be provided.

[0062] Furthermore, the magnet 12 is reliably pressed by the first contact portion 13b and the second contact portion 13c of the magnet holder 13, so that the plane 12b is reliably pressed against the outer peripheral surface 11a of the rotor 11 without loosening.

[0063] In this embodiment, the magnet 12 uses eight fish cake-shaped components, and the rotor 11 is roughly in the shape of a regular octagonal prism. However, regardless of the number of magnets, the shape can be segmented or other shapes, and the rotor 11 can be cylindrical or other shapes.

[0064] Next, in Figure 11 A perspective view of rotor unit 15 is shown in the figure.

[0065] A protective tube 14, made of a non-magnetic material such as stainless steel or aluminum formed by deep drawing, is externally fitted to the magnet holder 13, which is fixed in the manner described above. In this embodiment, the outer perimeter of the magnet holder 13 is configured to be slightly larger than the outer perimeter of the magnet 12. After the protective tube 14 is fixed to the magnet holder 13 by slightly pressing it in, its end face is bent and fixed in contact with the upper and lower surfaces of the magnet holder 13 or the rotor 11.

[0066] In this rotor unit 15, it can also be configured without the protective tube 14, but it is installed to prevent the rotor unit 15 from locking in the event that the magnet 12 breaks or falls off. Furthermore, the protective tube 14 more securely fixes and holds the magnet holder 13 and the magnet 12. Finally, the rotor unit 15 is completed by pressing the rotor shaft 10 into the through hole 11b of the rotor 11.

[0067] Furthermore, in this embodiment, the rotor shaft 10 is pressed in and fixed after the magnet is fixed to the rotor 11. However, it goes without saying that the magnet 12 can also be fixed after the rotor 11 is pressed in and fixed to the rotor shaft 10.

[0068] As described above, the rotary motor according to Embodiment 1 can be configured with a small cage, thus eliminating the need for complex and expensive molds for insert molding, and allowing for the manufacture of a low-cost cage. Furthermore, the position of the magnet is not affected by the accuracy of the cage or the assembly accuracy of the cage and rotor, but is determined with high precision solely by the accuracy of the rotor, resulting in excellent characteristics of low torque pulses and low cogging torque. Additionally, since a single cage is radially fixed to the rotor from the shaft, there is no need for magnet pressing operations, allowing for simple assembly. Moreover, since the magnet is not scratched during assembly, a rotary motor that does not rust, maintains high accuracy, and has high reliability is achieved.

[0069] Implementation Method 2

[0070] Next, use Figures 12 to 16 The structure of the rotor unit 15 in this embodiment 2 will be described in detail.

[0071] exist Figure 12 , Figure 13 The figures show a perspective view and a side view of the assembled rotor 11, magnet 12, and magnet cage 13 according to Embodiment 2. Furthermore, in... Figure 14 A perspective view of rotor 11 is shown in the figure. Figure 15 A perspective view of the magnet holder 13 is shown. The magnet 12 is the same as in Embodiment 1. Furthermore, descriptions of structures and functions identical to those in Embodiment 1 are omitted.

[0072] As from Figure 15 As shown in the front view of figure (A), the magnet holder 13 has upper and lower surfaces and four claw portions 13g located between them. Thus, the pressing portion 13a is divided into three parts, and the third contact portion 13d and the non-contact portion 13e are also divided into three parts. Furthermore, as from... Figure 15 As shown in the diagram of the back side of (B), the root of the claw portion 13g is connected to the main body through a fine flexure portion 13h, and a protrusion 13i that is higher than the surrounding back side is formed near the center of the flexure portion 13h. In addition, a hole 13j and a long hole 13k are formed in the recess on the back side.

[0073] Next, as Figure 14 As shown, on the upper and lower surfaces of the rotor 11 and between them, engagement portions 11h are formed at four locations corresponding to a magnet holder 13, which engage with the claw portions 13g of the magnet holder 13. Figure 16 yes Figure 12The DD section, which is shown to facilitate understanding the structure of the engaging part 11f from the center to the left, shows the rotor 11 without the magnet holder 13 installed. Since the rotor 11 is formed by stacking electromagnetic steel plates vertically, even complex shapes like those described above can be easily formed.

[0074] In the above structure, the positioning, fixing structure, method, and function of magnet 12 are the same as in implementation method 1. Figure 13 The B-B section and C-C section are also related to Figure 9 , Figure 10 Same. After pressing in the magnet holder 13, as... Figure 16 As shown in the center to the right, the claw portion 13g of the magnet retainer 13 is hooked onto the engaging portion 11h of the rotor 11, thus the retaining force becomes higher relative to the centrifugal force generated radially during rotation.

[0075] Furthermore, in Embodiment 1, the axial position of the magnet 12 is defined by the positioning protrusions 11e and 11f of the rotor 11. However, in this embodiment, since the positioning is achieved by the engagement of the claw portion 13g at the axial end with the engaging portion 11h at the axial end of the magnet 12, the lower surface of the assembled rotor 11 is equal to the lower surface 12f of the magnet 12. Alternatively, axial positioning can also be achieved using the positioning protrusions 11e and 11f as in Embodiment 1.

[0076] Next, use Figure 17 , Figure 18 The assembly method is explained in detail. Figure 17 This indicates the state before the magnet holder 13 is pressed in. Figure 18 This indicates the state after the magnet holder 13 has been pressed in.

[0077] First, such as Figure 17 As shown, the rotor 11 and eight magnets 12 are mounted on the fixing fixture 100, with the hole 13j and the elongated hole 13k on the back side. Figure 15 Based on the (B) diagram, the magnet holder 13 is set at eight movable clamps 101.

[0078] By lowering the upper mold (not shown), the eight movable clamps 101 move radially simultaneously, pressing the pressing portion 13a of the magnet holder 13 into the slot 11g of the rotor 11. Simultaneously, the claw portion 13g of the magnet holder 13 contacts the rotor 11 and moves while warping upwards or downwards. At this time, the root of the claw portion 13g of the magnet holder 13 has a fine flexural portion 13h and a protrusion 13i higher than the surrounding back surface, thus the claw portion 13g also warps radially, thereby comfortably hooking onto the engaging portion 11h of the rotor 11. When the magnet holder 13 is released from the movable clamps 101, the flexural nature of the claw portion 13g is released, allowing it to be securely fixed to the engaging portion 11h of the rotor 11 without loosening.

[0079] Based on the above structure and assembly method, in addition to the effects described in Embodiment 1, radial anti-detachment can be achieved through a simple operation of radially inserting the magnet retainer 13, enabling more secure radial retention without the need for additional components or processes. In this embodiment, the anti-detachment mechanism is formed by the claw portion 13g, but it goes without saying that other processes such as bonding, riveting, threading, or pinning can also be used to establish the anti-detachment mechanism. Furthermore, the structure and assembly method of the rotor unit 15 are the same as in Embodiment 1.

[0080] Implementation Method 3

[0081] In Embodiment 3, the case of applying the magnet mounting structure of Embodiment 2 to the stepped skewed rotor unit 15 will be described.

[0082] like Figure 19 As shown, in this embodiment, the two rotors 11 are offset by a predetermined angle (a few degrees) in the circumferential direction, so that they are stacked in two layers in the axial direction and pressed into and fixed to the rotor shaft 10, and the magnet 12 is fixed to the two rotors 11 by the magnet retainer 13.

[0083] exist Figure 20 ( Figure 20 (A) is the image viewed from the front. Figure 20 Figure (B) shows a perspective view of the magnet holder from the rear. The two magnet holders of Embodiment 2 are similarly offset circumferentially from the rotor 11 by a predetermined angle to form an axially overlapping shape, and are integrally molded. Here, in Figure 21 and Figure 22 The figures show bottom views of the magnet retainer 13 and the rotor 11 (partial enlarged views). The pressing portion 13a and the claw portion 13g of the magnet retainer 13 are configured to be parallel at their upper and lower sides, which are axially coincident. The slots of the slot portion 11g and the slots of the engaging portion 11h of the rotor 11 are also configured to be parallel at their upper and lower sides, which are axially coincident.

[0084] Therefore, the magnet holder 13 can be smoothly pressed into the rotor 11 radially. The assembly method is the same as in Embodiment 1 and Embodiment 2, as follows: Figure 23 As shown, the process ends with the magnet holder 13 being moved radially and pressed in simultaneously while all magnets 12 are positioned relative to the rotor.

[0085] Subsequently, as Figure 24 As shown, after fixing the protective tube 14 to the magnet holder 13 by slightly pressing it in, similar to Embodiment 1, the end face is bent and contacted with the upper and lower surfaces of the magnet holder 13 or the rotor 11 and fixed to complete the rotor unit 15. Furthermore, in this embodiment, a component formed by offsetting the two rotors 11 by a fixed angle (a few degrees) in the circumferential direction and overlapping them in the axial direction is pressed in and fixed to the rotor shaft 10. However, it is also possible to integrally manufacture a component that offsets the rotors 11 by a predetermined angle (a few degrees) in the circumferential direction, and fix the magnet 12 to the rotor shaft 10 in the same manner as in Embodiments 1 and 2. Since the rotor 11 is formed by stacking electromagnetic steel plates, even complex shapes like those described above can be easily formed.

[0086] As described above, according to this embodiment, in the stepped skew-type rotor unit 15, the magnet retainer 13 can be assembled radially in a one-degree press-fit operation without increasing the number of rotors 11 and magnet retainers 13, providing a low-cost, easy-to-assemble, and high-precision rotary motor. Furthermore, the effects described in Embodiments 1 and 2 can be achieved.

[0087] This application describes various exemplary implementation methods and embodiments, but the various features, methods and functions described in one or more implementation methods are not limited to specific implementation methods, and can be applied to implementation methods alone or in various combinations.

[0088] Therefore, numerous variations not illustrated are contemplated within the scope of the technology disclosed in this application. These include variations, additions, or omissions of at least one constituent element, as well as the extraction of at least one constituent element and its combination with constituent elements of other embodiments.

[0089] (Symbol Explanation)

[0090] 1 Rotary motor; 2 Frame; 3 Stator; 4 Insulator; 5 Stator winding; 6 Terminal; 7 Bearing; 8 Bearing housing; 9 Bearing; 10 Rotor shaft; 11 Rotor; 11a Outer peripheral surface; 11b Through hole; 11c, 11d Positioning protrusions; 11e, 11f Positioning protrusions; 11g Slot; 11h Engaging part; 12 Magnet; 13 Magnet retainer; 13a Press-in part; 13b First contact part; 13c Second contact part; 13d Third contact part; 13e Non-contact part; 13f Fourth contact part; 13g Claw part; 13h Flexural part; 13i Protrusion; 13j Hole; 13k Elongated hole; 14 Protective tube; 15 Rotor unit; 16 Connector; 17 Radiator; 100 Fixed clamp; 101 Movable clamp.

Claims

1. A rotary electric motor, characterized in that, include: Rotor, the rotor being fixed to the shaft; A plurality of magnets are disposed on the outer periphery of the rotor; and a retainer, which is disposed between the plurality of magnets and secures the magnets. The rotor has a first positioning part for positioning the magnet in the axial direction and a groove for pressing and fixing the cage. The cage has a pressing part for pressing into the groove and a first pressing part for fixing the magnet in the axial direction. By pressing the pressing part into the groove, the first pressing part presses and fixes the end of the magnet that has been positioned by the first positioning part. The first positioning part is formed at one end of the axial direction and engages with the magnet. The first pressing part is formed on the axial side of the retainer. By pressing the pressing part into the groove, the first pressing part presses the other end of the magnet in the axial direction that is not engaged with the first positioning part.

2. The rotary motor as described in claim 1, characterized in that, A second positioning part formed on the rotor and circumferentially positioned engages with one circumferential end of the magnet. A second pressing part formed on the cage and fixing the magnet is formed on the circumferential side of the pressing part. By pressing the pressing part into the groove, the second pressing part presses the other circumferential end of the magnet that is not engaged with the second positioning part in both the circumferential and radial directions.

3. The rotary motor as described in claim 2, characterized in that, The second pressing part presses the end of the magnet that engages with the second positioning part in the radial direction.

4. A rotary electric motor, characterized in that, include: Rotor, the rotor being fixed to the shaft; A plurality of magnets are disposed on the outer periphery of the rotor; and a retainer, which is disposed between the plurality of magnets and secures the magnets. The rotor has a positioning part for positioning the magnet and a groove for pressing and fixing the cage. The retainer has a pressing part for pressing into the groove, a pressing part for fixing the magnet, and a radial anti-detachment means. The anti-detachment means comprises a claw extending from the flexible portion and integrally formed with the pressing portion. The flexible portion is integrally formed with the retainer and elastically displaces in the radial direction. By pressing the insert into the groove, the pressing part presses and fixes the end of the magnet, which has been positioned by the positioning part. The pressing portion and the claw portion are arranged alternately in the axial direction and extend parallel to each other.

5. The rotary electric motor as described in any one of claims 1 to 4, characterized in that, The magnets are stacked in multiple layers along the axial direction, with each layer staggered in the circumferential direction.

6. The rotary electric motor as described in claim 5, characterized in that, The cage secures the magnets, which overlap in the axial direction, into a single unit.

7. A method for manufacturing a rotary electric motor according to any one of claims 1 to 6, characterized in that, Multiple cages are simultaneously assembled onto the rotor.

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