Rotor

Abstract

The utility model provides a rotor which can perform fine adjustment of weight balance more accurately to improve the rotation effect of the rotor. The rotor includes: a rotating shaft rotatable along a center line; a rotor core fixed to the rotating shaft and provided with a magnet insertion hole; a magnet inserted into the magnet insertion hole; the fixing pieces are formed on two opposite end surfaces of the rotor iron core and are inserted into the magnet insertion holes to fix the magnets; the groove is formed in the fixing piece and provided with a plurality of groove parts with different shapes, and balancing weights with different weights are arranged in at least one of the groove parts.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of rotary electric machines, and a rotor applied to rotary electric machine. BACKGROUND

[0002] In the prior art (for example, the content disclosed in Japanese Patent Publication No. 2023-59343), a rotor applied to a rotary electric machine includes, for example, a rotor core, a rotating shaft that penetrates the rotor core and is rotatable, and a pair of retaining portions that are arranged on opposite sides of the rotating shaft in the axial direction of the rotating shaft and directly or indirectly retain the rotor core. In addition, the rotor can also be provided with a thin portion (i.e., a portion having a thickness thinner than other portions) for adjusting weight balance on at least one of the pair of retaining portions. However, in such prior art, since the thin portion for adjusting weight balance is provided on the retaining portion near the rotating shaft, there is a problem that the thin portion becomes larger compared to the case where the weight balance portion is provided on the outer peripheral side. Therefore, it is necessary to improve the structure of the rotor. SUMMARY

[0003] The utility model provides a kind of rotor, can more accurately carry out the micro-adjustment of weight balance to improve the rotating effect of rotor.

[0004] The utility model provides a kind of rotor, including: rotating shaft, rotatable along center line;Rotor core, is fixed to the rotating shaft, and is equipped with magnet insertion hole;Magnet, is inserted into the magnet insertion hole;Fixed part, forms in the opposite end surface of the rotor core, and inserts the magnet insertion hole, with the magnet is fixed;And recess, forms in the fixed part, and with the shape different multiple groove portion, to at least one of the multiple groove portion configuration weight different counterweight.

[0005] In the embodiment of the utility model, multiple the groove portion is communicated with each other and constitutes the recess.

[0006] In the embodiment of the utility model, multiple the groove portion shares a part of the recess.

[0007] In the embodiment of the utility model, the gravity center of multiple the groove portion is coincident with each other.

[0008] In the embodiment of the utility model, at least one of multiple the groove portion extends in the depth direction, to configure multiple same shape counterweight in the depth direction of the groove portion.

[0009] In the embodiment of the utility model, at least one of multiple the groove portion extends in the width direction, to configure multiple same shape counterweight in the width direction of the groove portion.

[0010] In the embodiment of the utility model, the rotor further comprises: a cover body covering the groove and used as a counterweight.

[0011] In the embodiment of the utility model, at least a portion of the cover body forms a thin portion with a thickness thinner than other portions.

[0012] Based on the above, in the rotor of the utility model, the fixing member is formed at opposite end faces of the rotor core and is inserted into the magnet insertion hole to fix the magnet. Moreover, the groove is formed in the fixing member and has a plurality of groove portions with different shapes to arrange counterweights with different weights in at least one of the plurality of groove portions. In this way, the user can insert the counterweights with the required weight in the groove according to the requirement to adjust the weight balance of the rotor. Moreover, the groove can arrange the counterweights with different weights, so that the required weight can be finely adjusted. Accordingly, the rotor of the utility model can finely adjust the weight balance to improve the rotation effect of the rotor.

[0013] In order to make the above features and advantages of the utility model more obvious and easy to understand, the following examples are described in detail below, and the drawings are described as follows. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a top view schematic diagram of the rotor of an embodiment of the utility model;

[0015] Figure 2 is Figure 1 the cross-sectional view schematic diagram of the rotor shown in along A-A' transverse line;

[0016] Figure 3A is Figure 1 the local enlarged schematic diagram of the rotor shown in, and Figure 3B is Figure 3A the cross-sectional view schematic diagram of the rotor of along B-B' transverse line at the groove;

[0017] Figure 4A is Figure 3A the local enlarged schematic diagram of the first example of arranging the counterweight in the rotor shown in the groove, and Figure 4B is Figure 4A the cross-sectional view schematic diagram of the rotor of along C-C' transverse line at the groove;

[0018] Figure 5A is Figure 3A the local enlarged schematic diagram of the second example of arranging the counterweight in the rotor shown in the groove, and Figure 5B is Figure 5A the cross-sectional view schematic diagram of the rotor of along D-D' transverse line at the groove;

[0019] Figure 6A isFigure 3A The rotor shown is a partially enlarged schematic diagram of a third example in which a counterweight is configured in a groove, and Figure 6B yes Figure 5A Schematic diagram of the cross section of the rotor at the groove along the E-E' cross section line;

[0020] Figure 7A yes Figure 3A The rotor shown is a partially enlarged schematic diagram of a fourth example in which a counterweight is configured in a groove, and Figure 7B yes Figure 7A Schematic diagram of the cross section of the rotor at the groove along the F-F' cross section line;

[0021] Figure 8A yes Figure 3A The rotor shown is a partially enlarged schematic diagram of a fifth example in which a counterweight is configured in a groove, and Figure 8B yes Figure 8A Schematic diagram of the cross section of the rotor at the groove along the G-G' cross section line;

[0022] Figure 9A yes Figure 3A The rotor shown is a partially enlarged schematic diagram of a sixth example in which a counterweight is configured in a groove, and Figure 9B yes Figure 9A Schematic diagram of the cross section of the rotor at the groove along the H-H' transverse line;

[0023] Figure 10 yes Figure 1 The shown schematic diagram is a partially enlarged perspective view of the rotor near the groove.

[0024] Description of Reference Numerals

[0025] 100: rotor;

[0026] 110: Rotation axis;

[0027] 120: rotor core;

[0028] 122: magnet insertion hole;

[0029] 130: Magnet;

[0030] 140: fixing parts;

[0031] 142: insertion part;

[0032] 144: protrusion;

[0033] 146: mounting hole;

[0034] 150: groove;

[0035] 152: groove;

[0036] 152a: first groove;

[0037] 152b: second groove;

[0038] 152c: third groove;

[0039] 160a: first counterweight;

[0040] 160b: second counterweight;

[0041] 160c: third counterweight;

[0042] 170: cover;

[0043] 172: Ontology;

[0044] 174: mounting convex portion;

[0045] 176: thin part of meat;

[0046] C: center line;

[0047] G: center of gravity;

[0048] L1, L2, L3: length;

[0049] W1, W2, W3: width. DETAILED DESCRIPTION

[0050] Below, with reference to the attached Figure 1 The embodiments of the present invention are described below. Figure 1 This is a schematic top view of a rotor according to an embodiment of the present invention; Figure 2 yes Figure 1 The shown schematic diagram of a cross section of the rotor cut along the A-A' cross section line; Figure 3A yes Figure 1 The partial enlarged schematic diagram of the rotor shown in FIG. Figure 3B yes Figure 3A Schematic diagram of the cross section of the rotor at the groove along the BB' cross section line; Figure 4A yes Figure 3A The rotor shown is a partially enlarged schematic diagram of a first example of configuring a counterweight in a groove, and Figure 4B yes Figure 4A Schematic diagram of the cross section of the rotor at the groove along the C-C' cross section line; Figure 5A yes Figure 3A The rotor shown is a partially enlarged schematic diagram of a second example in which a counterweight is configured in a groove, and Figure 5B yes Figure 5A Schematic diagram of the cross section of the rotor at the groove along the D-D' cross section line; Figure 6A yes Figure 3A The rotor shown is a partially enlarged schematic diagram of a third example in which a counterweight is configured in a groove, andFigure 6B is a cross-sectional view of the rotor shown in Figure 5A at the recess along the E-E' cross-sectional line; Figure 7A is a cross-sectional view of the rotor shown in Figure 3A at the recess along the F-F' cross-sectional line; Figure 7B is a cross-sectional view of the rotor shown in Figure 7A at the recess along the G-G' cross-sectional line; Figure 8A is a cross-sectional view of the rotor shown in Figure 3A at the recess along the H-H' cross-sectional line; Figure 8B is a cross-sectional view of the rotor shown in Figure 8A at the recess along the G-G' cross-sectional line; Figure 9A is a cross-sectional view of the rotor shown in Figure 3A at the recess along the H-H' cross-sectional line; Figure 9B is a cross-sectional view of the rotor shown in Figure 9A at the recess along the H-H' cross-sectional line; Figure 10 is a cross-sectional view of the rotor shown in Figure 1 at the recess along the H-H' cross-sectional line; the following will describe the specific structure of the rotor 100 of the present application, as well as various examples of weight balancing thereof using counterweights of different weights, but the present application is not limited thereto, and can be adjusted as needed. Figures 1 to 10 Please refer to

[0051] In the present embodiment, the rotor 100 includes a rotating shaft 110, a rotor core 120, a magnet 130, a fixing member 140, and a recess 150. The rotating shaft 110 is rotatable along a center line C. The rotor core 120 is fixed to the rotating shaft 110 and is provided with a magnet insertion hole 122. The magnet 130 is inserted into the magnet insertion hole 122. The fixing member 140 is formed at opposite end faces of the rotor core 120 and is inserted into the magnet insertion hole 122 to fix the magnet 130. The recess 150 is formed in the fixing member 140 and has a plurality of groove portions 152 of different shapes, so as to arrange counterweights (such as various examples shown in Figures 1 to 3B ) of different weights in at least one of the plurality of groove portions 152. The specific structure of the plurality of groove portions 152 and the counterweights, as well as the arrangement manner, etc. will be described later. Figures 4A to 9B

[0052] Specifically, in the present embodiment, as shown in Figures 1 to 3B ​As shown, the rotor core 120 is formed as a cylindrical structure with the center line C as the center and extending along the center line C. The rotating shaft 110 is formed as a circular rod-shaped structure extending along the center line C and penetrating the center of the rotor core 120 along the direction of the center line C. Further, the rotor core 120 is provided with a plurality of magnet insertion holes 122 arranged at equal intervals in the circumferential direction, and a plurality of magnets 130 are inserted into the plurality of magnet insertion holes 122 correspondingly. In addition, the fixing member 140 is formed of a resin material, for example, in a state that the magnets 130 have been inserted into the magnet insertion holes 122, resin material is injected into the magnet insertion holes 122 through a resin molding process, so that the resin material fills in the magnet insertion holes 122 to coat the magnets 130, and protrudes from the magnet insertion holes 122 to the opposite end surfaces of the rotor core 120. In this way, after the resin material is hardened, the fixing member 140 is formed, wherein the insertion part 142 of the fixing member 140 fixes the magnets 130 in the magnet insertion holes 122, and the protruding part 144 of the fixing member 140 protrudes to the opposite end surfaces of the rotor core 120 and is latched on the opposite end surfaces of the rotor core 120. In the case that a plurality of magnet insertion holes 122 are provided, preferably, the fixing member 140 (i.e., having a plurality of fixing members 140) for fixing the magnets 130 is provided correspondingly in all the magnet insertion holes 122. However, the specific structure of the rotating shaft 110, the rotor core 120, the magnets 130, and the fixing member 140 is not limited, which can be adjusted according to the needs.

[0053] Further, in the present embodiment, as Figure 3A With Figure 3BAs shown, the groove 150 is, for example, a recessed structure formed on the surface of the protruding portion 144 of the fixing member 140. In the case where a plurality of fixing members 140 (corresponding to a plurality of magnet insertion holes 122) are provided, corresponding grooves 150 can be formed on the surface of the protruding portion 144 of all the fixing members 140, but can also be formed only on the surface of the protruding portion 144 of a part of the fixing members 140. Preferably, a plurality of grooves 150 are arranged at equal intervals in the circumferential direction with the center line C as the center on at least one end surface side of the rotor core 120, so as to symmetrically arrange the weight blocks. The groove 150 can be formed on the surface of the protruding portion 144 of the fixing member 140 by a protruding structure inside a mold (not shown) in the process of forming the fixing member 140 by a resin molding process. Describing one groove 150 formed on the surface of the protruding portion 144 of one fixing member 140, a plurality of groove portions 152 formed on the surface of the protruding portion 144 of the same fixing member 140 constitute one groove 150 (whether or not the plurality of groove portions 152 are connected). For example, the groove 150 has a first groove portion 152a substantially in the shape of a rectangle, a second groove portion 152b in the shape of an elongated shape extending in the substantially circumferential direction, and a third groove portion 152c in the shape of an elongated shape extending in the radial direction. Thereby, at least one of a plurality of weight blocks, for example, substantially in the shape of a rectangle or an elongated shape and different in weight, can be arranged in at least one of the plurality of groove portions 152. The plurality of grooves 150 formed on the plurality of fixing members 140 can have the same structure, or can partially have different structures or have different structures in whole. The present application is not limited to the specific structure of the groove 150, which can be adjusted as needed.

[0054] With the above arrangement, in the rotor 100 of the present embodiment, the fixing member 140 is formed on the opposite end surfaces of the rotor core 120, and the magnet 130 is fixed by being inserted into the magnet insertion hole 122. Also, the groove 150 is formed in the fixing member 140, and has a plurality of groove portions 152 different in shape, so as to arrange weight blocks different in weight in at least one of the plurality of groove portions 152. Thereby, it is understood that the weight carried by the groove 150 is different when the weight blocks different in weight are arranged in at least one of the plurality of groove portions 152 (i.e., at least one of the first groove portion 152a, the second groove portion 152b, and the third groove portion 152c). In this way, the user can arrange the weight blocks of the desired weight in the groove 150 as needed, so as to adjust the weight balance of the rotor 100. Also, the groove 150 can arrange the weight blocks different in weight, so as to be able to finely adjust the desired weight. Accordingly, the rotor 100 of the present embodiment can more accurately finely adjust the weight balance, so as to improve the rotation effect of the rotor 100.

[0055] Further, in the present embodiment, as shown in FIG. 1, the rotor core 120 is formed in the shape of a circular ring, and the plurality of fixing members 140 are arranged at equal intervals in the circumferential direction with the center line C as the center on the opposite end surfaces of the rotor core 120. Also, the plurality of magnet insertion holes 122 are formed in the fixing members 140, and the plurality of magnets 130 are arranged in the plurality of magnet insertion holes 122. Also, the plurality of grooves 150 are formed in the fixing members 140, and the plurality of weight blocks 160 are arranged in the plurality of grooves 150. Figure 3AAs shown, a groove 150 is formed on the surface of the protrusion 144 of one of the fixing members 140, and the plurality of grooves 152 (i.e., the first groove 152a, the second groove 152b, and the third groove 152c) of the groove 150 communicate with each other to constitute the groove 150, and the plurality of grooves 152 share a portion of the groove 150. For example, a portion of each of the second groove 152b and the third groove 152c overlaps a portion of the first groove 152a, and shares a middle portion of the groove 150. Preferably, the respective centers of gravity of the plurality of grooves 152 coincide with each other, and the plurality of grooves 152 are symmetrically arranged with respect to the coinciding centers of gravity G as a center point. In addition, as shown in various examples of Figure 3B As shown, at least one of the plurality of grooves 152 extends in the depth direction, and at least one of the plurality of grooves 152 extends in the width direction, so that a plurality of counterweights of the same shape are arranged in the depth direction of the groove 152, and a plurality of counterweights of the same shape are arranged in the width direction of the groove 152, as shown in various examples of Figures 4A to 9B Thus, when counterweights of different weights are arranged in at least one of the plurality of grooves 152 of the groove 150, the weight carried by the groove 150 also differs. In addition, the groove 150 is not limited to arranging a corresponding counterweight in each of the plurality of grooves 152, but can also maintain a vacant state (i.e., without arranging a counterweight) for a portion or all of the grooves 152. However, in other embodiments not shown, the plurality of grooves 152 of the groove 150 are not limited to communicating with each other or sharing a portion of the groove 150, nor are the respective centers of gravity of the plurality of grooves 152 limited to coinciding with each other, as long as the groove 150 has a plurality of grooves 152 and can install counterweights of different weights in at least one of the plurality of grooves 152.

[0056] As an example, in the present embodiment, as shown in Figure 3A The length L1 of the first groove 152a in the circumferential direction is one-third of the length L2 of the second groove 152b in the circumferential direction, the width W1 of the first groove 152a in the radial direction is three or four times the width W2 of the second groove 152b in the radial direction, the length L3 of the third groove 152c in the radial direction is equivalent to the length L1 of the first groove 152a in the circumferential direction, and the width W3 of the third groove 152c in the circumferential direction is equivalent to the width W2 of the second groove 152b in the radial direction. Thus, as shown in Figures 4A to 9BIn the various examples shown, at least one of a first counterweight 160a having a generally rectangular shape and a first weight (e.g., 1 gram), a second counterweight 160b having a generally circumferential shape and a second weight (e.g., 0.5 gram), and a third counterweight 160c having a radial shape and a third weight (e.g., 0.15 gram) can be positioned corresponding to the shape of at least one of the plurality of grooves 152 of the recess 150. Furthermore, counterweights of different weights are not limited to being positioned in a particular groove 152. For example, the third counterweight 160c having a smaller weight is not limited to being positioned only in the third groove 152c but can also be positioned in either the first groove 152a or the second groove 152b, which is larger and has at least a portion of a corresponding shape. Furthermore, the multiple grooves 152 of the groove 150 can be configured with only one counterweight block of one weight, or with multiple counterweight blocks of one weight (i.e., the same weight), or with multiple counterweight blocks of different weights, thereby adjusting the total weight of the counterweight blocks configured in the groove 150.

[0057] In such Figure 4A and Figure 4B In the first example shown, the first groove 152a extends in the depth direction, so that multiple (e.g., two) first counterweights 160a of the same shape and overlapping in the depth direction and having a first weight (e.g., 1 gram) can be arranged in the depth direction of the first groove 152a. In this way, the total weight of the counterweights arranged in a single groove 150 is the sum of the weights of the multiple (two) first counterweights 160a (e.g., 2 grams). Similarly, in the example Figure 5A and Figure 5B In the second example shown, the second groove portion 152b extends in the depth direction, so that a plurality (for example, two) of second counterweight blocks 160b having the same shape and overlapping in the depth direction and having a second weight (for example, 0.5 grams) can be arranged in the depth direction of the second groove portion 152b. In this way, the total weight of the counterweight blocks arranged in a single groove 150 is the sum of the weights of the plurality (two) second counterweight blocks 160b (for example, 1 gram). However, in other embodiments not shown, a plurality (for example, two) of third counterweight blocks 160c having the same shape and overlapping in the depth direction and having a third weight (for example, 0.15 grams) can also be arranged in the depth direction of the third groove portion 152c. Figures 7A to 9B Alternatively, only one counterweight block may be disposed in the first groove portion 152a, the second groove portion 152b, or the third groove portion 152c. The present invention does not limit the number of counterweight blocks of the same shape that can be disposed, and the number can be adjusted according to needs.

[0058] Furthermore, in Figure 6A and Figure 6BIn the third example shown, the first groove 152a and the second groove 152b extend in the depth direction and share the middle portion of the recess 150, so that a first weight block 160a having a first weight (e.g., 1 gram) can be arranged in the first groove 152a, a second weight block 160b having a second weight (e.g., 0.5 gram) can be arranged in the second groove 152b, and the plurality of weight blocks of different shapes partially overlap in the depth direction of the shared portion of the grooves 152. In this way, the total weight of the weight blocks arranged in the single recess 150 is the sum of the weights of one first weight block 160a and one second weight block 160b (e.g., 1.5 grams). Similarly, in the fourth example shown below, Figure 7A With Figure 7B In the fourth example shown, the second groove 152b and the third groove 152c extend in the depth direction and share the middle portion of the recess 150, so that a second weight block 160b having a second weight (e.g., 0.5 gram) can be arranged in the second groove 152b, a third weight block 160c having a third weight (e.g., 0.15 gram) can be arranged in the third groove 152c, and the plurality of weight blocks of different shapes partially overlap in the depth direction of the shared portion of the grooves 152. In this way, the total weight of the weight blocks arranged in the single recess 150 is the sum of the weights of one second weight block 160b and one third weight block 160c (e.g., 0.65 grams). However, in other embodiments not shown, a first weight block 160a and a third weight block 160c can also be arranged in the first groove 152a and the third groove 152c, respectively. Furthermore, the positions of the plurality of weight blocks of different shapes in the depth direction can also be adjusted. The present application does not limit the number and arrangement of the weight blocks of different shapes, which can be adjusted as needed.

[0059] In addition, in the fifth example shown, Figure 8A With Figure 8BIn the illustrated fifth example, the first groove portion 152a extends in the depth direction, so that a plurality of (for example, two) first counterweights 160a of the same shape and overlapping in the depth direction, each having a first weight (for example, 1 gram), can be arranged in the depth direction of the first groove portion 152a. Also, the second groove portion 152b extends in the depth direction and the width direction, and shares the middle portion of the recess 150 with the first groove portion 152a, so that a plurality of (for example, two) third counterweights 160c of the same shape and overlapping in the depth direction, each having a third weight (for example, 0.15 gram), can be arranged in the depth direction of the two side portions of the second groove portion 152b other than the shared portion with the first groove portion 152a, and a plurality of (for example, two) third counterweights 160c of the same shape can be arranged in the width direction of the two side portions of the second groove portion 152b. In this way, the total weight of the counterweights arranged in a single recess 150 is the sum of the weights of the two first counterweights 160a and the four third counterweights 160c (for example, 2.6 grams). Also, the counterweights of different weights are not limited to which of the plurality of groove portions 152 they are arranged in. For example, the third counterweights 160c of smaller weight are not limited to being arranged only in the third groove portion 152c, but can also be arranged in the second groove portion 152b of larger size and having at least a portion of the shape corresponding thereto. In other unillustrated examples, a plurality of third counterweights 160c of smaller weight can also be arranged in the first groove portion 152a of larger size and having at least a portion of the shape corresponding thereto. The present application does not limit the number of counterweights arranged and the arrangement thereof, which can be adjusted as needed.

[0060] Further, in the case where the recess 150 is formed in the Figure 9A and Figure 9BIn the illustrated sixth example, the first groove portion 152a and the second groove portion 152b extend in the depth direction and share the middle portion of the recess 150, and the second groove portion 152b extends in the width direction, so that one first weight block 160a having a first weight (e.g., 1 gram) can be arranged in the first groove portion 152a, a plurality (e.g., two) of third weight blocks 160c having a third weight (e.g., 0.15 gram) and having the same shape can be arranged in the two side portions of the second groove portion 152b in the width direction, and further, one second weight block 160b having a second weight (e.g., 0.5 gram) can be arranged in the depth direction of the second groove portion 152b in a state that one first weight block 160a has been arranged in the first groove portion 152a and the two side portions of the second groove portion 152b have been arranged with the plurality (two) of third weight blocks 160c, and the second weight block 160b partially overlaps the first weight block 160a and overlaps the third weight blocks 160c. In this way, the total weight of the weight blocks arranged in the single recess 150 is the total weight of one first weight block 160a, one second weight block 160b, and two third weight blocks 160c (e.g., 1.8 grams). However, in other embodiments not shown, only one or more of the first weight block 160a, the second weight block 160b, and the third weight block 160c can be arranged in the recess 150, and they can be arranged in at least one of the corresponding groove portions 152 according to requirements, as long as the weight blocks can be arranged in the groove portion 152 corresponding to the shape of the groove portion 152. The present application does not limit the number and arrangement of the weight blocks, which can be adjusted according to requirements.

[0061] In addition, in the present embodiment, as Figure 10As shown, the rotor 100 also includes a cover 170. The cover 170 covers the recess 150 and is used as a counterweight. In a case where the rotor 100 has a plurality of the fixtures 140 and a plurality of the recesses 150 are formed on the fixtures 140, the rotor 100 also has a plurality of the covers 170. Describing one of the fixtures 140 and the corresponding recess 150, a surface of the protruding portion 144 of the fixture 140 is formed with a mounting hole portion 146 (may be a plurality) positioned on an outer peripheral side of the recess 150, and the cover 170 includes a body portion 172 and a mounting protrusion 174 (may be a plurality) protruding from an outer peripheral edge or a corner of the body portion 172. The body portion 172 covers a range on the surface of the protruding portion 144 of the fixture 140 that is larger than a range of formation of the recess 150 on the surface of the protruding portion 144 of the fixture 140, and the mounting protrusion 174 corresponds to the mounting hole portion 146. The cover 170 is made, for example, by a resin molding process. Thus, by inserting the mounting protrusion 174 into the mounting hole portion 146 (e.g., press-fitting), the body portion 172 can be made to cover the recess 150, thereby fixing the counterweight (e.g., at least one of the aforementioned first counterweight 160a, the second counterweight 160b, and the third counterweight 160c) disposed in the recess 150 between the cover 170 and the recess 150. Also, the cover 170 has a weight (e.g., 0.5 g), so the cover 170 not only serves to fix the counterweight between the cover 170 and the recess 150, but also can be used as a counterweight.

[0062] As described above, for example Figures 4A to 9B As shown in the plurality of examples of the above-described Figure 10 In a state where the counterweight (e.g., at least one of the aforementioned first counterweight 160a, the second counterweight 160b, and the third counterweight 160c) is disposed in the recess 150, if the cover 170 is placed on the outer side of the recess 150, the total weight of each of the recesses 150 includes the weight of the disposed counterweight and the weight of the cover 170 (e.g., increases by 0.5 g). That is, if the cover 170 is placed on the outer side of the recess 150, the total weight of each of the examples increases by the weight of the cover 170 (e.g., increases by 0.5 g). Furthermore, in a state where the counterweight is disposed in the recess 150, the counterweight disposed in the recess 150 is not limited to being fixed by the cover 170, but can be fixed in the recess 150 by press-fitting into the recess 150 formed on the surface of the protruding portion 144 of the fixture 140 made of a resin material. That is, the side surface of the counterweight is in close contact with the inner side wall of the recess 150, and the counterweight is engaged in at least one of the plurality of grooves 152 of the recess 150. Thus, whether or not to install the cover 170 (to be used only as a counterweight) can be selected as needed. Further, as described above Figure 3AAs shown, even in the state where no counterweight is configured in the groove 150, the counterweight can be installed as shown in FIG. Figure 10 The cover 170 shown (serving only as a counterweight) increases the total weight of the corresponding recess 150. For example, if no counterweight is placed in the recess 150 and the cover 170 is placed on the outside of the recess 150, the total weight is equal to the weight of the counterweight plus the weight of the cover 170 (0.5 grams).

[0063] Furthermore, in this embodiment, if Figure 10 As shown, at least a portion of the cover 170 forms a thin portion 176 that is thinner than other portions. As an example, at least a portion of the surface of the main body 172 is formed with a recessed structure that reduces the thickness, and the thin portion 176 is formed at this location. Providing the thin portion 176 can reduce the weight of the cover 170 (for example, from 0.5 grams to 0.3 grams). Therefore, if the cover 170 having the thin portion 176 is placed on the outer side of the groove 150, the total weight of each groove 150 includes the weight of the configured counterweight block, plus the weight of the cover 170 having the thin portion 176 (for example, an increase of 0.3 grams). In this way, based on whether the thin portion 176 is provided and whether the cover 170 is installed, the weight of each part of the rotor 100 can be fine-tuned. For example, if the rotor 100 has multiple fixing members 140, some of the fixing members 140 are installed with a cover 170 having a thin portion 176 (for example, increasing the weight by 0.3 grams), some of the fixing members 140 are installed with a cover without a thin portion (not shown) (for example, increasing the weight by 0.5 grams), and the remaining fixing members 140 are not installed with any cover. This makes it easier to fine-tune the weight of various parts of the rotor 100. In addition, compared to the existing technology that forms the thin portion on the resin-molded fixing member 140, forming the thin portion 176 by machining the cover 170 can avoid directly machining the fixing member 140, which may cause the fixing member 140 to crack or damage the rotor core 120 and magnet 130 near the fixing member 140. However, the present invention does not limit the specific structure and configuration of the cover 170, and it can be adjusted according to needs.

[0064] In summary, in the rotor of the utility model, the fixing member is formed on the opposite two end surfaces of the rotor core, and the magnet is fixed by being inserted into the magnet insertion hole. Moreover, the groove is formed on the fixing member, and has a plurality of groove portions with different shapes, so as to arrange the counterweight blocks with different weights in at least one of the plurality of groove portions. In this way, the user can insert the counterweight blocks with the required weight in the groove according to the requirement, so as to adjust the weight balance of the rotor. Moreover, the groove can arrange the counterweight blocks with different weights, so as to finely adjust the required weight. Preferably, the rotor further comprises a cover body covering the groove, and at least a part of the cover body forms a thin portion with a thickness thinner than other portions, so as to more easily finely adjust the weight of each part of the rotor. Accordingly, the rotor of the utility model can more accurately finely adjust the weight balance to improve the rotation effect of the rotor.

[0065] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the utility model, and not to limit them; although the utility model has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. A rotor characterized by, Comprising: a rotation shaft rotatable along a center line; a rotor core fixed to the rotation shaft and provided with a magnet insertion hole; a magnet inserted into the magnet insertion hole; a fixing member formed at opposite end surfaces of the rotor core and inserted into the magnet insertion hole to fix the magnet; and a groove formed in the fixing member and having a plurality of groove portions different in shape to arrange weight different counterweights in at least one of the groove portions.

2. The rotor according to claim 1, wherein the plurality of groove portions communicate with each other to constitute the groove.

3. The rotor according to claim 2, wherein the plurality of groove portions share a part of the groove.

4. The rotor according to claim 3, wherein the respective centers of gravity of the plurality of groove portions coincide with each other.

5. The rotor according to claim 1, wherein at least one of the plurality of groove portions extends in a depth direction to arrange a plurality of counterweights of the same shape in the depth direction of the groove portion.

6. The rotor according to claim 1, wherein at least one of the plurality of groove portions extends in a width direction to arrange a plurality of counterweights of the same shape in the width direction of the groove portion. Further comprising:

7. The rotor of any one of claims 1 to 6, wherein a cover covering the groove and used as a counterweight.

8. The rotor according to claim 7, wherein at least a part of the cover forms a thin portion thinner in thickness than other portions. ​

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