Rotor

Abstract

The utility model provides a rotor, which comprises a rotor shaft, a rotor core and a magnet, the rotor core is sleeved on the rotor shaft, the rotor core comprises a plurality of rotor laminations which are laminated along the axial direction of the rotor shaft, the plurality of rotor laminations comprise a first rotor lamination and a second rotor lamination, the first rotor lamination is located at one axial side of the second rotor lamination, and the magnet is located at one axial side of the second rotor lamination. A positioning groove is formed in the periphery of the first rotor lamination, and the periphery of the second rotor lamination is circular; the magnet is embedded in the rotor core. The rotor core is additionally provided with the first rotor lamination with the positioning grooves formed in the periphery on the basis of the second rotor lamination, and during magnetizing positioning, the positioning grooves in the rotor are aligned with the positioning protrusions on the magnetizing tool so as to realize magnetizing positioning. Therefore, the arrangement of the positioning groove has little influence on the electromagnetic performance of the motor, so that the effects of magnetizing positioning, motor performance and low production cost are achieved.

Description

TECHNICAL FIELD

[0001] The embodiment of the utility model relates to electric tool technical field, especially a rotor. BACKGROUND

[0002] High-voltage brushless electric tools have begun to rise, which are configured with high-voltage brushless motors. In order to meet the safety requirements, the rotor of the brushless motor needs to adopt a double-insulation structure, thereby ensuring the safety of the tool users. Compared with the traditional method of first making a shaft and then pressing a core, the rotor integrated molding process is simpler to operate and has better assembly reliability. When the embedded rotor is integrally formed, the magnet is generally not magnetized, and the rotor is magnetized after being integrally formed.

[0003] When magnetizing, positioning features need to be designed on the rotor to ensure the magnetizing effect. The common structure can form a positioning feature by arc ablation on the surface of the rotor to realize magnetizing, but the arc ablation on the surface of the rotor will sacrifice part of the motor performance. UTILITY MODEL CONTENT

[0004] The purpose of the embodiment of the utility model is to provide a rotor, which aims to design a novel rotor magnetizing structure that can balance the magnetizing effect and motor performance.

[0005] To solve the above technical problems, the embodiment of the utility model provides a rotor, which comprises:

[0006] A rotor shaft;

[0007] A rotor core, which is sleeved on the rotor shaft, comprises a plurality of rotor laminations stacked along the axial direction of the rotor shaft, and the plurality of rotor laminations comprise a first rotor lamination and a second rotor lamination, the first rotor lamination is located on the axial side of the second rotor lamination, a positioning groove is formed on the outer periphery of the first rotor lamination, and the outer periphery of the second rotor lamination does not have a positioning part;

[0008] A magnet, which is embedded in the rotor core.

[0009] Preferably, the positioning part penetrates the first rotor lamination in the axial direction of the rotor shaft; the first rotor lamination is provided with a plurality of positioning parts, and the positioning parts on any two adjacent first rotor laminations are opposite and connected in the axial direction of the rotor shaft.

[0010] Preferably, the thickness of the first rotor lamination is smaller than that of the second rotor lamination.

[0011] Preferably, the first rotor lamination is provided with three first rotor laminations, and the thickness of the first rotor lamination is 1.05 mm.

[0012] Preferably, the positioning grooves are uniformly distributed on the first rotor lamination in the circumferential direction.

[0013] Preferably, the first rotor sheet is provided with a first through slot penetrating in the axial direction, the second rotor sheet is provided with a second through slot penetrating in the axial direction, the magnet is inserted into the second through slot, and the first through slot corresponds to the magnet.

[0014] Preferably, the first rotor sheet comprises a stop portion between the first through slots, the stop portion corresponds to the magnet, and the stop portion abuts to an end of the magnet.

[0015] Preferably, the rotor comprises a connecting piece between the rotor core and the rotor shaft, the connecting piece is injection molded, and the connecting piece extends from the first through slot to the second through slot.

[0016] Preferably, the rotor further comprises a fan, the fan is sleeved on the rotor shaft, and the fan and the first rotor sheet are respectively located on the axial two sides of the second rotor sheet.

[0017] In order to achieve the above-mentioned purpose, the utility model also provides a rotor, comprising:

[0018] A rotor shaft;

[0019] A rotor core, the rotor core is sleeved on the rotor shaft, the rotor core comprises a plurality of rotor sheets stacked in the axial direction of the rotor shaft, the plurality of rotor sheets comprise a first rotor sheet and a second rotor sheet, the first rotor sheet is located on one axial side of the second rotor sheet, a positioning portion is provided on the outer periphery of the first rotor sheet, and the outer periphery of the second rotor sheet is circular in shape.

[0020] A magnet, the magnet is embedded in the rotor core.

[0021] Compared with the prior art, the utility model has the following beneficial effects:

[0022] The rotor core of the rotor of the utility model increases the first rotor sheet with the positioning portion provided on the outer periphery on the basis of the second rotor sheet, so that in the process of assembling and forming the rotor, the first rotor sheet on the rotor core is placed downward in the forming mold, and then the magnet and the rotor shaft are placed, the positioning portion on the rotor is aligned and placed with the positioning protrusion on the magnetizing tool during magnetizing and positioning, so that magnetizing and positioning is realized. Since only part of the rotor sheets of the rotor core are provided with the positioning portion, the setting of the positioning portion has little influence on the electromagnetic performance of the motor, so that the effects of magnetizing and positioning, motor performance and low production cost are realized. BRIEF DESCRIPTION OF DRAWINGS

[0023] One or more embodiments are illustrated by way of example in the drawings in which like reference numerals indicate similar elements, and as such, the drawings should be considered for purposes of illustration only. The drawings are not necessarily drawn to scale, and the illustrations are not intended to limit the scope of the embodiments.

[0024] Figure 1 Structure diagram of the rotor in the embodiment of the utility model;

[0025] Figure 2 Structure diagram of the rotor in the embodiment of the utility model; Figure 1 Structure diagram of the rotor in the embodiment of the utility model;

[0026] Figure 3 Structure diagram of the rotor in the embodiment of the utility model; Figure 1 Structure diagram of the rotor in the embodiment of the utility model;

[0027] Figure 4 Structure diagram of the rotor in the embodiment of the utility model; Figure 3 Structure diagram of the rotor in the embodiment of the utility model;

[0028] Figure 5 Structure diagram of the rotor in the embodiment of the utility model; Figure 4 Structure diagram of the rotor in the embodiment of the utility model;

[0029] Figure 6 Structure diagram of the rotor in the embodiment of the utility model; Figure 1 Structure diagram of the rotor in the embodiment of the utility model.

[0030] The implementation, functional features and advantages of the utility model will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0032] It should be noted that if the embodiments of the utility model involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications also change accordingly.

[0033] In addition, if the description of "first", "second" and the like is involved in the embodiments of the present application, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the technical features or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the present application.

[0034] The utility model provides a kind of rotor, which can be used in brushless motor and the like motor, below will be introduced with rotor is used in brushless motor as an example, Figures 1 to 5 A preferred embodiment of the rotor provided by the utility model is shown.

[0035] Please refer to Figures 1 to 5 In the embodiment, the rotor 100 includes a rotor shaft 1, a rotor core 2, and a magnet 3. The rotor core 2 is sleeved on the rotor shaft 1. The rotor core 2 includes a plurality of rotor laminations 21 stacked along the axial direction of the rotor shaft 1. The plurality of rotor laminations 21 include first rotor laminations 21a and second rotor laminations 21b. The first rotor laminations 21a are located on one axial side of the second rotor laminations 21b. The outer periphery of the first rotor laminations 21a is provided with a positioning portion 211. The outer periphery of the second rotor laminations 21b is circular in shape. The magnet 3 is embedded in the rotor core 2.

[0036] Specifically, the rotor core 2 is sleeved on the middle part of the rotor shaft 1. The rotor core 2 is formed by a plurality of rotor laminations 21 stacked along the axial direction of the rotor shaft 1. The plurality of rotor laminations 21 include first rotor laminations 21a and second rotor laminations 21b. The first rotor laminations 21a are located on one axial side of all the second rotor laminations 21b. In the following, the axial direction of the rotor shaft 1 is defined as the upward and downward direction. The first rotor laminations 21a are located on the lower side of all the second rotor laminations 21b.

[0037] The second rotor laminations 21b can be conventional rotor laminations. Different from the second rotor laminations 21b, the outer periphery of the first rotor laminations 21a is provided with a positioning portion 211. The positioning portion 211 at least penetrates the lower surface of the first rotor laminations 21a. The specific shape of the positioning portion 211 can be set according to actual conditions. For example, the positioning portion 211 is a positioning groove. Further, the positioning groove 211 can be semi-circular, square, trapezoidal, or triangular in shape. The positioning groove 211 can be used for magnetizing positioning or installation positioning of the rotor 100. In the following, the magnetizing positioning of the rotor 100 by the positioning groove 211 is taken as an example for introduction.

[0038] The positioning groove 211 is arranged on the outer periphery of the partial rotor laminations 21 of the rotor core 2, and the first rotor lamination 21a is formed by the positioning groove 211, and the first rotor lamination 21a is used as a baffle. The first rotor lamination 21a and the second rotor lamination 21b (i.e. the rotor lamination 21 without the positioning groove 211 arranged on the outer periphery) are assembled into one rotor core 2. During the assembly and molding of the rotor 100, the first rotor lamination 21a on the rotor core 2 is placed downward in a molding mold, and then the magnet 3 and the rotor shaft 1 are placed. When the rotor 100 is magnetized and positioned, the positioning groove 211 on the rotor 100 is aligned and placed with the positioning protrusion on the magnetizing tool, so as to realize the magnetization and positioning. Since only the first rotor lamination 21a of the rotor laminations 21 is provided with the positioning groove 211, and the thickness of the rotor core 2 is generally higher than that of the stator core, the arrangement of the positioning groove 211 on the outer periphery of the partial rotor laminations 21 (i.e. the first rotor lamination 21a) has little effect on the electromagnetic performance of the motor.

[0039] The rotor core 2 of the rotor 100 of the utility model increases the first rotor lamination 21a with the positioning groove 211 arranged on the outer periphery on the basis of the second rotor lamination 21b, so that during the assembly and molding of the rotor 100, the first rotor lamination 21a on the rotor core 2 is placed downward in a molding mold, and then the magnet 3 and the rotor shaft 1 are placed, and when magnetization and positioning are performed, the positioning groove 211 on the rotor 100 is aligned and placed with the positioning protrusion on the magnetizing tool, so as to realize the magnetization and positioning. Since only the partial rotor laminations 21 of the rotor core 2 are provided with the positioning groove 211, the arrangement of the positioning groove 211 has little effect on the electromagnetic performance of the motor, so that the effects of considering the magnetization and positioning, the motor performance and low production cost are realized.

[0040] The second rotor lamination 21b is usually provided with a plurality of the first rotor laminations 21a, and the first rotor lamination 21a can be provided with one or more, and optionally, please refer to Figures 1 to 5 In the embodiment, the positioning groove 211 penetrates the first rotor lamination 21a in the axial direction of the rotor shaft 1, and the first rotor lamination 21a is provided with a plurality of the first rotor laminations 21a, and the positioning grooves 211 on any two adjacent first rotor laminations 21a are opposite and communicated in the axial direction of the rotor shaft 1.

[0041] Specifically, the positioning groove 211 penetrates the upper surface and the lower surface of the first rotor lamination 21a, a plurality of the first rotor laminations 21a are stacked on the lower side of all the second rotor laminations 21b in the axial direction of the rotor shaft 1, and the positioning grooves 211 on all the first rotor laminations 21a are opposite, so that the positioning grooves 211 on all the first rotor laminations 21a can be sequentially communicated, so that the positioning protrusion on the magnetizing tool can enter the positioning groove 211 of the plurality of the first rotor laminations 21a, so as to realize the positioning cooperation between the positioning protrusion on the magnetizing tool and the positioning groove 211 on the rotor 100.

[0042] The specific number of the first rotor laminations 21a can be set according to actual conditions, for example, the number of the first rotor laminations 21a can be 1-5. Alternatively, please refer to Figures 1 to 5 In the embodiment, the first rotor laminations 21a are provided with three or four.

[0043] Specifically, the number of the first rotor laminations 21a can be three or four, preferably, the first rotor laminations 21a are provided with three, the thickness of the first rotor laminations 21a is 1.05mm, the thickness of the rotor laminations 21 is the size of the rotor laminations 21 in the axial direction of the rotor shaft 1, so that the three first rotor laminations 21a are provided with the positioning grooves 211, which has little effect on the electromagnetic performance of the motor.

[0044] The outer periphery of the first rotor laminations 21a can be provided with one or more positioning grooves 211, alternatively, please refer to Figures 1 to 5 In the embodiment, the positioning grooves 211 are uniformly distributed in the circumferential direction of the first rotor laminations 21a. In this way, the rotor 100 is magnetized and positioned by the plurality of uniformly distributed positioning grooves 211, and the effect of magnetization and positioning is better.

[0045] Further, please refer to Figures 1 to 5 In the embodiment, the first rotor laminations 21a are provided with four positioning grooves 211. The interval between the adjacent two positioning grooves 211 is 90°, so that the magnetization and positioning of the rotor 100 can be better realized by the positioning cooperation of the four positioning grooves 211 on the rotor 100 and the four positioning protrusions on the magnetization tool.

[0046] The thickness of the first rotor laminations 21a can be equal to or different from the thickness of the second rotor laminations 21b, alternatively, please refer to Figures 1 to 5 In the embodiment, the thickness of the first rotor laminations 21a is less than the thickness of the second rotor laminations 21b. In this way, it is beneficial to reduce the influence of the positioning grooves 211 on the first rotor laminations 21a on the electromagnetic performance of the motor.

[0047] Alternatively, please refer to Figures 1 to 5 In the embodiment, the rotor 100 further includes a fan 4, the fan 4 is sleeved on the rotor shaft 1, and the fan 4 and the first rotor laminations 21a are located on the two sides of the second rotor laminations 21b in the axial direction.

[0048] Specifically, the rotor core 2 and the fan 4 are both sleeved on the outside of the rotor shaft 1, and the fan 4 and the first rotor lamination 21a are located on the upper and lower sides of the second rotor lamination 21b, respectively. The rotor core 2 is typically provided with a shaft hole 23 running vertically through it, so that the rotor shaft 1 can pass through the rotor core 2 through the shaft hole 23. Correspondingly, the first rotor lamination 21a is provided with a first through hole 231, and the second rotor lamination 21b is provided with a second through hole 232. Thus, all the first through holes 231 on the first rotor lamination 21a and all the second through holes 232 on the second rotor lamination 21b are joined together to form a shaft hole 23 extending vertically.

[0049] Magnet 3 is embedded within rotor core 2; magnet 3 can be a magnet or the like. Optionally, please refer to... Figures 1 to 5 In this embodiment, the first rotor lamination 21a is provided with a first through groove 221 that runs through the axial direction, and the second rotor lamination 21b is provided with a second through groove 222 that runs through the axial direction. The magnet 3 is inserted into the second through groove 222, and the first through groove 221 is provided corresponding to the magnet 3.

[0050] Specifically, the rotor core 2 typically has a magnet slot 22 extending vertically, and the magnet 3 is inserted into the magnet slot 22, thus embedding the magnet 3 within the rotor core 2. Each second rotor lamination 21b has a second through slot 222 extending vertically, and all the second through slots 222 of the second rotor laminations 21b are sequentially connected to form a magnet slot 22 extending vertically. The first rotor laminations 21a are located below the magnet 3, and each first rotor lamination 21a has a first through slot 221 extending vertically, which is connected to the lower end of the magnet slot 22. The length of the rotor core 2 (i.e., the vertical dimension of the rotor core 2) is less than or equal to the stack thickness of the multiple second rotor laminations 21b, thus embedding the magnet 3 within the multiple second rotor laminations 21b and ensuring that all the first rotor laminations 21a are located below the magnet 3.

[0051] Magnets 3 are typically arranged in multiples at intervals along the rotor core 2. The specific number of magnets 3 can be set according to the actual situation. For example, please refer to [reference needed]. Figures 1 to 5 In this embodiment, there are four magnets 3. Correspondingly, each first rotor lamination 21a is provided with four first through slots 221, and each second rotor lamination 21b is provided with four second through slots 222.

[0052] Further, please refer to Figures 1 to 5 In this embodiment, the first rotor lamination 21a includes a stop portion 223 located between the first through slots 221. The stop portion 223 is disposed corresponding to the magnet 3 and abuts against the end of the magnet 3.

[0053] Specifically, each stop 223 between the first through slots 221 abuts against the lower side of a corresponding magnet 3. Thus, during the process of inserting the magnet 3 into the magnet slot 22 of the rotor core 2, the stop 223 of the first rotor lamination 21a can position the rotor core 2 for insertion.

[0054] Optionally, please refer to Figures 1 to 5 In this embodiment, the rotor 100 includes a connector 5 located between the rotor core 2 and the rotor shaft 1. The connector 5 is injection molded and extends from the first through groove 221 to the second through groove 222.

[0055] Specifically, the connector 5 is typically a coated material, and can be made of resin as a filler material between the rotor core 2 and the rotor shaft 1. For example, the connector 5 can be made of BMC (bulk molding compound), which is low in cost and becomes fluid after hot melting for injection molding. The connector 5 is integrally injection molded from resin material between the rotor shaft 1 and the rotor core 2. After the rotor 100 is high-temperature molded, the resin material fills the gaps between the rotor shaft 1, the rotor core 2, and the magnet 3 through the injection molding process, providing good insulation and thus realizing the double-insulated rotor magnetization and positioning structure of the rotor 100. Furthermore, during the injection molding process, the connector 5 can enter the second through groove 222 (i.e., the magnet groove 22) from the first through groove 221, thereby filling the gap between the rotor core 2 and the magnet 3.

[0056] Connector 5 can be used for dynamic balancing of rotor 100; further, please refer to... Figures 1 to 5 In this embodiment, the connector 5 includes a middle portion 51 and two end portions 52. The middle portion 51 is located between the rotor shaft 1 and the rotor core 2. The two end portions 52 are located on both sides of the rotor core 2 along the axial direction of the rotor shaft 1.

[0057] Specifically, the two ends 52 are used to maintain the dynamic balance of the rotor 100, so that the dynamic balance of the rotor 100 can be corrected on the connector 5 to save production costs.

[0058] This utility model also provides an electric motor, which can be a brushless motor, such as a high-voltage brushless motor, and can be used in power tools. The motor includes a stator and a rotor, with the stator sleeved outside the rotor. Since the rotor adopts the technical solution of the above embodiments, it has the beneficial effects brought about by the technical solution of the above embodiments.

[0059] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the inventive concept of this utility model and the contents of this utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A rotor, characterized in that, include: Rotor shaft; The rotor core is sleeved on the rotor shaft. The rotor core includes a plurality of rotor laminations stacked along the axial direction of the rotor shaft. The plurality of rotor laminations include a first rotor lamination and a second rotor lamination. The first rotor lamination is located on one axial side of the second rotor lamination. The thickness of the first rotor lamination is less than the thickness of the second rotor lamination. The outer periphery of the first rotor lamination has a positioning part, while the outer periphery of the second rotor lamination does not have a positioning part. The first rotor lamination has a first through slot that runs through the axial direction, and the second rotor lamination has a second through slot that runs through the axial direction. The first through slot is provided corresponding to the second through slot. A magnet is inserted into the second through slot.

2. The rotor as claimed in claim 1, characterized in that, The positioning part penetrates the first rotor lamination in the axial direction of the rotor shaft; multiple first rotor laminations are provided, and the positioning parts on any two adjacent first rotor laminations are opposite to and connected in the axial direction of the rotor shaft.

3. The rotor as described in claim 1, characterized in that, The first rotor lamination has three laminations, and the thickness of the first rotor lamination is 1.05 mm.

4. The rotor as described in claim 2, characterized in that, The positioning parts are evenly distributed on the first rotor laminations in the circumferential direction.

5. The rotor as claimed in claim 1, characterized in that, The first rotor lamination includes a stop portion located between the first through slots, the stop portion being disposed corresponding to the magnet and abutting against the end of the magnet.

6. The rotor as described in claim 5, characterized in that, The rotor includes a connector located between the rotor core and the rotor shaft. The connector is injection molded and extends from the first through groove to the second through groove.

7. The rotor as claimed in claim 1, characterized in that, The rotor also includes a fan, which is sleeved on the rotor shaft, and the fan and the first rotor lamination are respectively located on opposite sides of the axial direction of the second rotor lamination.

8. A rotor, characterized in that, include: Rotor shaft; The rotor core is sleeved on the rotor shaft. The rotor core includes a plurality of rotor laminations stacked along the axial direction of the rotor shaft. The plurality of rotor laminations include a first rotor lamination and a second rotor lamination. The first rotor lamination is located on one axial side of the second rotor lamination. The thickness of the first rotor lamination is less than the thickness of the second rotor lamination. A positioning part is provided on the outer periphery of the first rotor lamination. The outer periphery of the second rotor lamination is circular. The first rotor lamination is provided with a first through slot that runs through the axial direction, and the second rotor lamination is provided with a second through slot that runs through the axial direction. The first through slot is provided corresponding to the second through slot. A magnet, which is inserted into the second through slot.

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