Rotor of a rotating electrical machine and rotating electrical machine

Abstract

An object of the present invention is to obtain a rotor and a rotating electric machine of a rotating electric machine that can improve the circumferential positioning accuracy of a magnet. A base portion (17) of a magnet holder (14) mounted on a rotor core portion (12) of a rotor (3) includes a press-fit pin (18) press-fitted into a press-fit hole (32) provided in an end face of the rotor core portion (12), and an arm portion (16) of the magnet holder (14) includes a holder rib (21) that projects radially inward of an output shaft (2) and one circumferential end face serves as a pressing surface (25); and an anti-disengagement protrusion portion (23) inserted into an insertion groove (29) provided in an outer peripheral surface of the rotor core portion (12). A magnet (13) is disposed between the rotor core portion (12) and the magnet holder (14), one circumferential end face abuts against the pressing surface (25), and the other circumferential end face abuts against a core rib (28) protruding from the rotor core portion (12).

Description

Technical Field

[0001] The present application relates to a rotor of a rotating electric machine and a rotating electric machine. Background Art

[0002] In a rotor of an existing rotating electric machine having permanent magnets, a magnet holder is included, and the magnet holder has: a holder base provided on a rotating shaft; a plurality of holder arm portions protruding axially of the rotating shaft from the holder base; and a bridge portion that connects the holder base and the holder arm portions and is elastic. (For example, refer to Patent Document 1).

[0003] Prior Art Documents

[0004] Patent Documents

[0005] Patent Document 1: International Publication No. 2007 / 080888 Summary of the Invention

[0006] Technical Problem to be Solved by the Invention

[0007] However, in the structure described in Patent Document 1, the elasticity of the bridge portion is used to achieve the circumferential positioning and fixing of the magnets. Therefore, the circumferential positioning accuracy of the permanent magnets deteriorates, and cogging torque and torque ripple may occur. In addition, the cogging torque and torque ripple as described above may deteriorate the performance of the rotating electric machine.

[0008] The present application discloses a technology for solving the above-described technical problems, and an object thereof is to obtain a rotor of a rotating electric machine and a rotating electric machine that can improve the circumferential positioning accuracy of magnets.

[0009] Technical Solution for Solving the Technical Problem

[0010] The rotor of the rotating electric machine disclosed in the present application includes: a rotor core portion fixed to an output shaft; a plurality of magnets arranged along the circumferential direction of the output shaft on the outer periphery of the rotor core portion; and a plurality of magnet holders having arm portions extending axially along the output shaft and a base portion that holds the arm portions. The base portion includes a press-in pin that is press-fitted into a press-in hole provided on an end face of the rotor core portion. The arm portion includes: a holder rib that protrudes radially inward of the output shaft, and one circumferential end face serves as a pressing surface; and a protrusion portion that is inserted into an insertion groove provided on the outer peripheral surface of the rotor core portion. The magnet is arranged between the rotor core portion and the magnet holder, one circumferential end face abuts against the pressing surface, and the other circumferential end face abuts against a core rib protruding from the rotor core portion.

[0011] Advantageous Effects of the Invention

[0012] According to the rotor of the rotating electric machine disclosed in the present application, the positioning accuracy of the magnet in the circumferential direction can be improved. Description of the Drawings

[0013] Figure 1 It is a cross-sectional view of the rotating electric machine according to Embodiment 1.

[0014] Figure 2 It is an exploded perspective view of the rotor according to Embodiment 1.

[0015] Figure 3 It is a perspective view of the magnet holder according to Embodiment 1.

[0016] Figure 4 It is a detailed view of the arm portion according to Embodiment 1.

[0017] Figure 5 It is a perspective view of the rotor core according to Embodiment 1.

[0018] Figure 6A It is Figure 5 The A-A cross-sectional view of, which is a top view of the first core plate according to Embodiment 1.

[0019] Figure 6B It is Figure 5 The B-B cross-sectional view of, which is a top view of the second core plate according to Embodiment 1.

[0020] Figure 6C It is Figure 5 The C-C cross-sectional view of, which is a top view of the third core plate according to Embodiment 1.

[0021] Figure 7 It is a diagram showing the assembly steps of the rotor according to Embodiment 1.

[0022] Figure 8A It is a perspective view of the rotor core with the magnet installed.

[0023] Figure 8B It is Figure 8A The D-D cross-sectional view of.

[0024] Figure 9 It is a perspective view of the magnet holder according to Embodiment 2.

[0025] Figure 10 It is a diagram showing the assembly steps of the rotor according to Embodiment 2.

[0026] Figure 11 It is a perspective view of the magnet holder according to Embodiment 3.

[0027] Figure 12 It is a perspective view of the rotor core according to Embodiment 3. Detailed Embodiments

[0028] Regarding the rotor and the rotating electric machine of the present application, embodiments thereof will be described below with reference to the accompanying drawings. In addition, in each figure, the same or similar structural parts are denoted by the same reference numerals. In order to avoid making the following description unnecessarily lengthy and to facilitate understanding by those skilled in the art, detailed descriptions of known matters and redundant descriptions of substantially the same structures may sometimes be omitted.

[0029] Embodiment 1

[0030] Based on Figures 1 to 8B Embodiment 1 will be described. Figure 1 FIG. is a cross-sectional view of the rotating electric machine according to Embodiment 1. The rotating electric machine 100 mainly includes a rotor 3 (i.e., the rotor of the rotating electric machine) built in a hollow cylindrical motor housing 1, a stator 4, and an output shaft 2 passing through the rotor 3. The rotor 3 is fixed to the output shaft 2, and the outer peripheral surface of the rotor 3 faces the inner peripheral surface of the stator 4 with an air gap therebetween. In addition, on the outer peripheral surface of the rotor 3, a plurality of pairs of permanent magnets (not shown) are arranged to form excitation poles on the outer peripheral surface of the rotor 3.

[0031] A three-phase (U-phase, V-phase, W-phase) armature winding 5 is wound around the stator 4. Near the upper side of the Figure 1 armature winding 5, a ring-shaped wiring portion 6 is arranged. Although not shown in the figure, the armature winding 5 and the ring-shaped wiring portion 6 are connected via the upper end portion of the armature winding 5 by welding or the like. The winding end portion 7 provided on the ring-shaped wiring portion 6 penetrates through a frame 8 described later and extends in the direction along the axis of the rotating electric machine 100, that is, the axial direction of the output shaft 2. The winding end portion 7 is connected to the armature winding 5 via the ring-shaped wiring portion 6. In addition, in the following description, the "output axial direction" refers to the axial direction of the output shaft 2, the "radial direction" refers to the radial direction of the output shaft 2, and the "circumferential direction" refers to the circumferential direction of the output shaft 2.

[0032] The winding end portion 7 is formed by gathering three conductors respectively connected to the end portions of the U-phase winding, the end portions of the V-phase winding, and the end portions of the W-phase winding of the armature winding 5.

[0033] In Figure 1 above and below the rotor 3, a pair of first bearings 9a and a pair of second bearings 9b that support the output shaft 2 for free rotation are respectively provided. The first bearing 9a is installed at the central portion of the frame 8. The frame 8 functions as a cover that seals the inside of the rotating electric machine 100. The second bearing 9b is fixed to a structural body 10 on the output side of the rotating electric machine 100.

[0034] A sensor rotor 11 is fixed to an end portion on the opposite side of the output of the output shaft 2 (the side opposite to the side of the structure 10 where the output side is disposed). A rotation sensor (not shown) is disposed with a gap from the end face on the opposite side of the output of the sensor rotor 11. The sensor rotor 11 includes one or more pairs of permanent magnets. The rotation sensor disposed separately from the sensor rotor 11 detects a change in the magnetic field of the permanent magnets of the sensor rotor 11 that rotates together with the rotation of the output shaft 2, converts it into an electrical signal, and sends the electrical signal to a control device (not shown) of the rotary electric machine 100 or the like. In addition, although the case where the sensor rotor 11 and the rotation sensor are of the magnetic sensor type has been described, it may be other than the magnetic sensor type, for example, it may be a resolver. Or it may also be a Hall sensor.

[0035] Figure 2 is an exploded perspective view of the rotor of Embodiment 1. A rotor core portion 12 is fixed to the output shaft 2, and magnets 13 as segment type permanent magnets are mounted on the outer periphery of the rotor core portion 12. The magnets 13 are positioned and fixed to the rotor core portion 12 by, for example, a magnet holder 14 made of synthetic resin. The number of magnet holders 14 is the same as the number of magnets 13 mounted on the rotor core portion 12. In addition, a hollow cylindrical cover 15 is mounted outside the magnets 13. The cover 15 has the following functions: when the magnets 13 are damaged, it prevents the fragments of the magnets 13 from flying around, and prevents the rotary electric machine 100 from being locked due to the fragments of the magnets 13. In the rotor 3 of Embodiment 1, a stepped skewing structure is adopted, and the rotor 3 includes two layers of rotor core portions 12 that are offset from each other in the circumferential direction. All the magnet holders 14 included in each rotor core portion 12 have the same shape. In addition, in Embodiment 1, in one rotor core portion 12, eight magnets 13 are mounted along the circumferential direction of the rotor core portion 12. Therefore, 8×2 columns of magnets 13 are arranged in the entire rotor 3. As described above, since the stepped skewing structure is adopted in the rotor 3, the magnets 13 of the same polarity in adjacent columns are mounted at positions offset by a predetermined step angle along the circumferential direction.

[0036] Figure 3 is a perspective view of the magnet holder of Embodiment 1. The magnet holder 14 includes a base portion 17. When the base portion 17 is mounted on the rotor core portion 12, one side is the radially inner side of the output shaft 2, and the other side is the radially outer side of the output shaft 2. The base portion 17 is in a fan shape that expands from the radially inner side to the radially outer side. In one surface of the base portion 17, an arm portion 16 is provided at the center of the radially outer side. The arm portion 16 holds the magnet 13 in the radial and circumferential directions and extends along the output axis direction.

[0037] On the surface of the base portion 17 on the side of the arm portion 16, a press-in pin 18 is protruding and provided at the center thereof. The press-in pin 18 is used to fix the magnet holder 14 to the rotor core portion 12. Further, in the surface of the base portion 17 on the side of the arm portion 16, a step is formed by the end portion on the radially outer side bulging toward the arm portion side, and an output-axial holding portion 19 for holding the magnet 13 in the output axial direction is provided. The output-axial holding portion 19 abuts against one end face of the magnet 13 in the output axial direction and holds the magnet 13 in the output axial direction. Further, the end face on the radially outer side of the base portion 17 on the side opposite to the arm portion (the side opposite to the side of the arm portion 16) is formed as a tapered portion facing radially inward, and a guiding portion 20 is provided. By means of the guiding portion 20, the accommodation of the rotor core portion 12 into the cover 15 becomes easier when assembling the rotor 3. Additionally, in consideration of the formability of the magnet holder 14, through holes may be appropriately provided in the base portion 17.

[0038] The arm portion 16 holds the magnet 13 in the radial direction through its radially inner surface 16a. That is, as will be described later, when the magnet 13 is inserted between the rotor core portion 12 and the magnet holder 14, the radially inner surface 16a of the arm portion 16 abuts against the radially outer surface of the magnet 13, thereby holding the magnet 13 in the radial direction. Further, a holder rib 21 for holding the circumferential side surface of the magnet 13 is provided on the arm portion 16. The holder rib 21 protrudes radially inward from the circumferential center portion of the arm portion 16. A notch portion 22 is provided on the side of the base portion 17 of the holder rib 21. The length of the notch portion 22 in the output axial direction is set to be longer than twice the length of the press-in pin 18. Further, a detachment-preventing protrusion portion 23, that is, a protrusion, which further protrudes radially inward from the holder rib 21 is provided at the end portion of the holder rib 21 on the side opposite to the base portion (the side opposite to the side of the base portion 17). The detachment-preventing protrusion portion 23 prevents the circumferential detachment of the magnet holder 14 when assembling the magnet holder 14 to the rotor core portion 12.

[0039] Figure 4 is a detailed view of the arm portion of Embodiment 1, which is a view when observing Figure 3 the shown arm portion 16 from the direction facing radially outward. The circumferential width of the root portion of the detachment-preventing protrusion portion 23 is smaller than the circumferential width of the front end portion, and a reduced-diameter portion 24 is formed. Further, one circumferential surface of the holder rib 21 becomes a pressing surface 25, and the surface on the side opposite to the pressing surface 25 becomes a retreating surface 26. Although the details will be described later, when mounting the magnet 13 to the rotor core portion 12, the pressing surface 25 abuts against the circumferential side surface of the magnet 13 to press the magnet 13, and the retreating surface 26 does not abut against the magnet 13 and is separated from the magnet 13.

[0040] Figure 5It is a perspective view of the rotor core of Embodiment 1. At both ends in the output axis direction of the outer peripheral surface 27 of the rotor core 12 having a substantially octagonal prism shape, a plurality of core ribs 28 protruding radially outward are provided at a prescribed interval in the circumferential direction. The core ribs 28 press against the magnets 13 to position them, and two are provided for each of the magnets 13. In Embodiment 1, eight magnets 13 are mounted on one rotor core 12, so sixteen core ribs 28 are provided for one rotor core 12.

[0041] An insertion groove 29 and a locking groove 30 are provided between the two core ribs 28 for each magnet 13. The insertion groove 29 is a groove into which the anti - detachment protrusion 23 of the magnet holder 14 is inserted, and its circumferential width is equal to or greater than the circumferential width of the anti - detachment protrusion 23. The locking groove 30 is a groove for preventing the anti - detachment protrusion 23 from falling off radially outward, and it has a shape that fits with the front end portion of the anti - detachment protrusion 23. The output axis direction length of the insertion groove 29 and the locking groove 30 is longer than the output axis direction length of each anti - detachment protrusion 23. A plurality of press - fit holes 32 are provided at prescribed intervals in the circumferential direction on one end face 31 in the output axis direction. The press - fit holes 32 press - fit and fix the press - fit pins 18 of the magnet holder 14. In Embodiment 1, since eight magnets 13 are mounted on the rotor core 12, eight magnet holders 14 are also assembled. Therefore, eight press - fit holes 32 are also provided. In addition, as long as the output axis direction length of the insertion groove 29 and the locking groove 30 is equal to or greater than the output axis direction length of the anti - detachment protrusion 23, it can be appropriately changed. Further, the distance between one end face 31 in the output axis direction and the locking groove 30 is smaller than the distance between the base portion 17 of the magnet holder 14 and the anti - detachment protrusion 23. Thus, when the press - fit pin 18 is press - fit into the press - fit hole 32, the anti - detachment protrusion 23 fits with the locking groove 30.

[0042] Figure 6A is Figure 5 the A - A cross - sectional view, which is a top view of the first core plate of Embodiment 1. Figure 6B is Figure 5 the B - B cross - sectional view, which is a top view of the second core plate of Embodiment 1. In addition, Figure 6C is Figure 5A C-C cross-sectional view, which is a top view of the third core plate of Embodiment 1. The rotor core 12 is formed by laminating a first core plate 33A, a second core plate 33B, and a third core plate 33C each made of an electromagnetic steel sheet with a thickness of about 0.5 mm and welding the laminated side surfaces. A plurality of first core plates 33A are laminated to form the end portion on the output axial single-side end surface 31 side and the press-fitting hole 32 of the rotor core 12. A plurality of second core plates 33B are laminated to form the central portion and the insertion groove 29 of the rotor core 12. A plurality of third core plates 33C are laminated to form the end portion of the rotor core 12 on the side opposite to the output axial single-side end surface 31 and the locking groove 30.

[0043] Next, the assembly steps of the rotor 3 of Embodiment 1 will be described. Figure 7 This is a diagram showing the assembly steps of the rotor of Embodiment 1. First, after inserting the anti-disengagement protrusion 23 of the magnet holder 14 into the insertion groove 29 of the rotor core 12 from the radially outer side, the magnet holder 14 is moved along the output axis, and the press-fitting pin 18 is pressed into the press-fitting hole 32 of the rotor core 12 to fix it. At this time, then, the magnet 13 is inserted along the output axis from the side of the magnet holder 14 opposite to the base portion. In Embodiment 1, eight magnets 13 are inserted relative to one rotor core 12. The magnet 13 is pressed in until it reaches the same height as the output axial opposite side end surface 35 of the rotor core 12 through the press-fitting surface 34, so as to insert the magnet 13 into the gap 36 between the magnet holder 14 and the rotor core 12. Here, the press-fitting surface 34 is the end surface of the magnet 13 on the side opposite to the base portion, which is the surface pressed when the magnet 13 is inserted. The output axial opposite side end surface 35 is the output side direction end surface on the side opposite to the output axial single-side end surface 31.

[0044] Next, in the same steps, the magnet 13 and the magnet holder 14 are also installed in another rotor core 12, the centers are aligned, the two rotor cores 12 are arranged and configured in the output axis direction, and the output shaft 2 is pressed into the center holes of the two rotor cores 12 on which the magnets 13 are installed. At this time, the two rotor cores 12 are arranged such that the magnets 13 respectively installed in the two rotor cores 12 have the same polarity. After the output shaft 2 is pressed in, a part of the output shaft 2 protrudes from the rotor core 12. Finally, the cover 15 is moved from the side opposite to the side where the output shaft 2 protrudes and covers the two rotor cores 12, and the output axial both ends of the cover 15 are bent toward the radially inner side to provide the bent portion 37, thereby completing the rotor 3. When the two rotor cores 12 are arranged, in order to prevent the magnet holders 14 installed in each rotor core 12 from interfering with each other, the output axial opposite side end surfaces 35 are opposed to each other.

[0045] In addition, in the magnet holder 14, the output axial length of the notch portion 22 is set to be longer than twice the length of the press-in pin 18. Therefore, when the anti-disengagement protrusion 23 of the magnet holder 14 is inserted into the insertion groove 29 of the rotor core portion 12 from the radially outer side and the magnet holder 14 is moved along the output axis, interference between the holder rib 21 and the core rib 28 is prevented, making it easier to install the magnet holder 14.

[0046] Next, the holding and positioning of the magnet 13 will be described. Figure 8A is a perspective view of the rotor core portion in a state where the magnet is installed. Figure 8B is Figure 8A D-D cross-sectional view of. As Figure 8A shown, magnet holders 14 are arranged on both circumferential sides of the magnet 13, and the circumferential ends of the radially outer side surfaces of the magnet 13 are respectively in contact with the radially inner side surfaces 16a of the arm portions 16 of the magnet holders 14 on both sides. Thus, the magnet 13 is pressed against the radially inner side surface 16a to be held in the radial direction. In addition, as Figure 8B shown, on the other hand, one circumferential side surface 13a of the magnet 13 is in contact with the pressing surface 25 of the holder rib 21 at its central portion, and the upper and lower end portions are separated from the core rib 28. One circumferential opposite side surface 13b of the magnet 13 is separated from the yielding surface 26 of the holder rib 21 at its central portion, and the upper and lower end portions are in contact with the core rib 28. That is, the magnet 13 is held by the pressing surface 25 on one circumferential side and by the core rib 28 on the circumferentially opposite side. In this way, since the magnet 13 is held on both circumferential sides, the circumferential positioning is accurate. In addition, since the vertical positions of the core rib 28 and the pressing surface 25 are different, the magnet 13 has holding elements that stagger the vertical positions on one circumferential side and the circumferentially opposite side, and through the above combination, a structure is formed in which the upper end portion, the central portion, and the lower end portion are all held and positioned in the circumferential direction. In addition, the yielding surface 26 forms a dimensional relationship that does not protrude toward the magnet 13 side compared to the core rib 28 when the magnet 13 is pressed against the core rib 28, and the magnet 13 forms a structure that is reliably pressed against the core rib 28.

[0047] The effects obtained by the device configured in the above manner will be described.

[0048] In the first embodiment, by supporting the magnet from both sides in the circumferential direction by the pressing surface of the holder rib provided on the magnet holder and the core rib of the rotor core portion, circumferential fixing and positioning can be performed. Thus, the circumferential positioning accuracy of the magnet can be improved.

[0049] In addition, by providing the yielding surface on the opposite side of the pressing surface, the magnet is reliably pressed against the core rib. Thus, the circumferential positioning accuracy of the magnet is further improved.

[0050] In addition, since notches are provided in the cage ribs of the magnet cage to prevent interference with the core ribs when inserting into the rotor core, core ribs for positioning can be provided at two locations at both axial ends of the output with respect to each magnet. As a result, the circumferential position of the magnet with respect to the rotor core can be determined with further high precision.

[0051] In addition, by fitting the anti - detachment protrusion of the magnet cage into the locking groove of the rotor core, detachment of the magnet cage in the radial direction is prevented, and the side of the magnet cage opposite to the base portion expands in the radial direction.

[0052] In addition, the output axial direction of the magnet is held by the output axial holding portions of the magnet and the magnet cage of the same polarity mounted on adjacent rotor cores, thus preventing the offset of the output axial direction of the magnet.

[0053] In addition, compared with the case where only the holding force of the bent portion of the cover is used to hold the output axial direction of the magnet, in addition to being able to hold the magnet cage, the press - in force of the rotor core can also be applied for holding. Therefore, the magnet can be fixed more firmly in the output axial direction.

[0054] In addition, since a guide portion 20 is provided at the base portion of the magnet cage, the cover can easily cover the rotor core.

[0055] In a rotating electric machine, if cogging torque, torque ripple, etc. occur due to circumferential and output axial position offsets between the magnet and the rotor core and radial looseness generated when inserting the magnet, the performance of the rotating electric machine may deteriorate. In Embodiment 1, as described above, high - precision positioning is achieved in the circumferential, radial, and output axes, and the magnet is reliably fixed. Therefore, the above - mentioned cogging torque, torque ripple, etc. can be reduced, and the deterioration of the performance of the rotating electric machine caused by the cogging torque, torque ripple, etc. can be suppressed.

[0056] Embodiment 2

[0057] Next, based on Figure 9 and Figure 10 Embodiment 2 will be described. Embodiment 2 is different from Embodiment 1 in that the output axial holding portion of the magnet cage is separated from the base portion and arranged on the side opposite to the base portion. In addition, the structures of the rotating electric machine 100 and the rotor core 12 are the same as those in Embodiment 1, so the description thereof is omitted.

[0058] Figure 9 is a perspective view of the magnet cage of Embodiment 2. The magnet cage 38 is composed of a base portion 17 and an arm portion 16 in the same manner as the magnet cage 14 of Embodiment 1. The press - in pin 18, the guide portion 20, the cage rib 21, the notch portion 22, and the anti - detachment protrusion 23 are also the same as those in Embodiment 1.

[0059] On the side of the arm portion 16 opposite to the base portion, there is provided an output axial direction holding portion 39 extending in both circumferential directions. Therefore, the output axial direction holding portion 19 is not provided on the base portion of the magnet holder 38. The shape of the output axial direction holding portion 39 is the same as that of the output axial direction holding portion 19 of the first embodiment.

[0060] Next, the assembling steps of the rotor 3 of the second embodiment will be described. Figure 10 FIG. is a view showing the assembling steps of the rotor of the second embodiment. First, the output shaft 2 is press-fitted into the holes at the centers of the two rotor core portions 12. At this time, the opposite end faces 35 in the output axial direction are opposed to each other, which is the same as in the first embodiment.

[0061] Next, the magnet holder 38 is assembled to the rotor core portion 12 into which the output shaft 2 has been press-fitted at the center. After inserting the anti-drop projection portion 23 of the magnet holder 38 into the insertion groove 29 of the rotor core portion 12 from the radially outer side, the magnet holder 38 is moved along the output axial direction, and the press-fit pin 18 is press-fitted into the press-fit hole 32 of the rotor core portion 12 and fixed. Subsequently, eight magnets 13 are inserted into one rotor core portion 12 from the side of the base portion 17 of the magnet holder 38 assembled to the rotor core portion 12. At this time, the magnets 13 are simultaneously press-fitted until they reach the same height as the output axial direction single-side end face 31 of the rotor core portion 12 through the press-fit surface 34 of the magnets 13, so as to insert the magnets 13 into the gap 36 between the magnet holder 38 and the rotor core portion 12. Finally, the cover 15 covers the two rotor core portions 12 from the side opposite to the side where the output shaft 2 protrudes, and the output axial direction both-end portions of the cover 15 are bent toward the radially inner side to form the bent portions 37, thereby completing the rotor 3. In addition, the holding and positioning of the magnets 13 are the same as in the first embodiment.

[0062] According to the second embodiment, the same effects as those of the first embodiment can be obtained.

[0063] In addition, since the output axial direction holding portion is not provided on the base portion but on the side of the arm portion opposite to the base portion, the magnets can be assembled after the output shaft is press-fitted into the rotor core portion, so that the position deviation of the magnets when the output shaft is press-fitted into the rotor core portion will not occur. Therefore, higher-precision positioning can be achieved. In addition, since the output shaft can be press-fitted into the rotor core portion one by one, it is not necessary to align the centers of the two rotor core portions when press-fitting the output shaft, so the equipment structure is simple and the workability is also improved.

[0064] Embodiment 3

[0065] Next, based on Figure 11 and Figure 12Explanation is made on Embodiment 3. Embodiment 3 is different from Embodiments 1 and 2 in that it includes a plurality of magnet holders in the anti - detachment protrusion portion. In addition, since the structure of the rotating electric machine 100 is the same as that of Embodiment 1, the description thereof is omitted.

[0066] Figure 11 It is a perspective view of the magnet holder of Embodiment 3. The magnet holder 40 is composed of a base portion 17 and an arm portion 16 in the same manner as the magnet holder 14 of Embodiment 1. The press - fit pin 18, the output - axis holding portion 19, the guide portion 20, and the notch portion 22 are also the same as those in Embodiment 1.

[0067] Two anti - detachment protrusion portions 23 arranged along the output axis are provided on the holder rib 21. The shape of each anti - detachment protrusion portion 23 is the same as that of Embodiments 1 and 2. In addition, except for the number of the anti - detachment protrusion portions 23, the holder rib 21 is the same as that of Embodiments 1 and 2.

[0068] Figure 12 It is a perspective view of the rotor core portion of Embodiment 3. A plurality of core ribs 28 protruding radially outward are provided at both ends in the output axis direction of the outer peripheral surface 27 of the rotor core portion 41 having a substantially octagonal prism shape at regular intervals in the circumferential direction. The core ribs 28 press against the magnets 13 for positioning them in the same manner as in Embodiment 1, but in Embodiment 1, three are provided for each magnet 13. In addition, in Embodiment 3, eight magnets 13 are also mounted on one rotor core portion 41, so there are twenty - four core ribs 28 provided for one rotor core portion 41.

[0069] An insertion groove 29 and a locking groove 30 are alternately provided along the output axis between two core ribs 28 for each magnet 13. The upper - side insertion groove 29 and locking groove 30 among the two insertion grooves 29 and two locking grooves 30 correspond to the anti - detachment protrusion portion 23 closer to the base portion 17 in the magnet holder 40. The lower - side insertion groove 20 and locking groove 30 correspond to the anti - detachment protrusion portion 23 farther from the base portion 17 in the magnet holder 40. In addition, in the same manner as in Embodiment 1, the output - axis length of each insertion groove 29 and locking groove 30 is longer than the output - axis length of the respective corresponding anti - detachment protrusion portion 23. Moreover, the distance between the output - axis single - side end face 31 and each locking groove 30 is smaller than the distance between the respective corresponding anti - detachment protrusion portion 23 and the base portion 17 of the magnet holder 40. Thus, when the press - fit pin 18 is pressed into the press - fit hole 32, each anti - detachment protrusion portion 23 is engaged with the corresponding locking groove 30. Other points of the rotor core portion 41 are the same as those of the rotor core portion 12 of Embodiment 1.

[0070] When assembling the rotor 3, after inserting the two anti-disengagement protrusions 23 of the magnet holder 40 into the two insertion grooves 29 of the rotor core 41 from the radially outer side, the magnet holder 40 is moved along the output axis. Thereby, the press-fit pin 18 is press-fitted into the press-fit hole 32 of the rotor core 41 and fixed. The insertion of the magnet 13, the press-fitting of the output shaft 2, and the installation of the cover 15 are the same as those in the first embodiment.

[0071] In addition, the second embodiment can also be combined with the third embodiment. In this case, regarding the insertion of the magnet 13, it is inserted from the base portion side as in the second embodiment.

[0072] According to the third embodiment, the same effects as those of the first embodiment can be obtained.

[0073] Furthermore, since there are provided a plurality of anti-disengagement protrusions for preventing the radial disengagement of the magnet holder, the stress applied to one anti-disengagement protrusion is dispersed, and the endurance of the magnet holder itself is improved.

[0074] This application describes various exemplary embodiments and examples, but the various features, modes, and functions described in one or more embodiments are not limited to being applied to a specific embodiment, and can be applied to embodiments alone or in various combinations.

[0075] Therefore, countless deformation examples that are not illustrated are envisioned within the technical scope disclosed in this application. For example, it includes cases where at least one component is deformed, added, or omitted. Additionally, it also includes cases where at least one component is extracted and combined with the components of other embodiments. For example, in the first to third embodiments, examples of applying the technology disclosed in this application to a rotating electric machine with a stepped skewed structure are shown, but the technology disclosed in this application can also be applied to a motor without a stepped skewed structure. Furthermore, in the first to third embodiments, the multiple magnet holders installed on one rotor core each have a base portion and are in a divided state when viewed as a whole, but it is also possible to provide a magnet holder having a common base portion and a plurality of arm portions provided on the common base portion. In addition, the number of magnets and magnet holders is not limited to the cases described above.

[0076] (Reference Signs)

[0077] 2 Output shaft; 3 Rotor; 12, 41 Rotor core; 13 Magnet; 14, 38, 40 Magnet holder; 15 Cover; 16 Arm part; 17 Base part; 18 Press-fit pin; 19, 39 Output axial holding part; 20 Guide part; 21 Holder rib; 22 Notch part; 23 Anti-disengagement protrusion; 25 Pressing surface; 26 Yielding surface; 27 Outer peripheral surface; 28 Core rib; 29 Insertion groove; 30 Locking groove; 31 Output axial single-side end face; 32 Press-fit hole; 36 Gap; 37 Bending part; 100 Rotating electric machine.

Claims

1. A rotor of a rotating electric machine, comprising: A rotor core fixed to an output shaft; A plurality of magnets circumferentially arranged along the output shaft on the outer periphery of the rotor core; And A plurality of magnet holders having arm portions extending axially along the output shaft and base portions for holding the arm portions, Characterized in that The base portion includes press-in pins that are press-fitted into press-fit holes provided in the end face of the rotor core, The arm portion includes: a holder rib protruding radially inward of the output shaft, with one circumferential end face serving as a pressing surface; and a protrusion inserted into an insertion groove provided on the outer peripheral surface of the rotor core, The magnet is disposed between the rotor core and the magnet holder, with one circumferential end face abutting against the pressing surface and the other circumferential end face abutting against a core rib protruding from the rotor core.

2. The rotor of the rotating electric machine according to claim 1, characterized in that The holder rib is provided with a notch portion of a predetermined length on the side where the base portion is located.

3. The rotor of the rotating electric machine according to claim 1 or 2, characterized in that A locking groove is provided on the outer peripheral surface of the rotor core, and the locking groove is adjacent to the insertion groove in the axial direction and engages with the protrusion.

4. The rotor of the rotating electric machine according to any one of claims 1 to 3, characterized in that The base portion includes an output-axial holding portion that extends circumferentially and holds the magnet in the axial direction.

5. The rotor of the rotating electric machine according to any one of claims 1 to 3, characterized in that The arm portion includes an output-axial holding portion that extends circumferentially from the end on the side opposite to the base portion side and holds the magnet in the axial direction.

6. The rotor of the rotating electric machine according to any one of claims 1 to 5, characterized in that A plurality of the protrusions are provided along the axial direction.

7. The rotor of the rotating electric machine according to any one of claims 1 to 6, characterized in that A plurality of the rotor cores are axially arranged, and each of the rotor cores is circumferentially offset from each other by a predetermined angle.

8. A rotating electric machine, comprising the rotor of the rotating electric machine according to any one of claims 1 to 7.

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