Motor and electric tool

Abstract

The utility model relates to the technical field of motors, aims to solve the technical problem that some known motors cannot give consideration to heat dissipation and performance improvement, and provides a motor and an electric tool. The motor comprises a stator assembly, a first rotor assembly and a second rotor assembly. The first rotor assembly comprises a first rotor iron core and a fan structure, the stator assembly is sleeved with the first rotor iron core, the fan structure is integrally formed at one end, in the axial direction of the stator assembly, of the first rotor iron core, and the fan structure is configured to rotate along with rotation of the first rotor iron core. The second rotor assembly is arranged on the inner side of the stator assembly. The motor has the beneficial effects that the performance improvement and the heat dissipation effect of the motor are both considered.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric tools, in particular to a motor and an electric tool. BACKGROUND

[0002] Some known motors have the technical problem that it is difficult to improve the performance and heat dissipation. SUMMARY

[0003] The present application provides a motor and an electric tool to solve the technical problem that some known motors cannot improve the performance and heat dissipation.

[0004] The present application provides a motor, comprising a stator assembly, a first rotor assembly and a second rotor assembly. The first rotor assembly comprises a first rotor core and a fan structure, the first rotor core is sleeved on the stator assembly, the fan structure is integrally formed on one end of the first rotor core along the axial direction of the stator assembly, and the fan structure is configured to rotate with the first rotor core. The second rotor assembly is arranged on the inner side of the stator assembly.

[0005] According to the motor of the present application, the first rotor assembly is arranged on the outer side of the stator assembly, and the second rotor assembly is arranged on the inner side of the stator assembly, thereby improving the space utilization of the inner side and the outer side of the stator assembly and improving the performance of the motor. At the same time, the fan structure is integrally formed on the first rotor assembly, which can improve the structural integration of the motor, reduce the structural complexity of the motor, reduce the assembly difficulty of the motor, and reduce the possibility of the fan structure falling off from the motor, ensure the stable operation of the fan structure, reduce the failure mode of the motor, and improve the working reliability of the motor. The fan structure can reliably dissipate heat for the simultaneous operation of the first rotor assembly and the second rotor assembly, so that the motor of the present embodiment can improve the performance and heat dissipation effect of the motor.

[0006] In a possible implementation manner:

[0007] The fan structure comprises a plurality of fan blades, one end of the plurality of fan blades is integrally formed on the first rotor core, the other end of the plurality of fan blades is connected to each other and integrally formed, and the one end of the plurality of fan blades integrally formed with the first rotor core is uniformly distributed along the circumferential direction of the stator assembly.

[0008] In a possible implementation manner:

[0009] The stator assembly has an axis, and the fan structure is configured to rotate around the axis under the driving of the first rotor core. The plurality of fan blades are distributed in a radial manner around the axis.

[0010] In a possible implementation manner:

[0011] The fan structure further comprises an end plate, which is spaced apart from the first rotor core along the axial direction of the stator assembly; and a plurality of the fan blades are integrally formed at one end of the first rotor core away from the end plate.

[0012] In one possible implementation:

[0013] The first rotor core defines a receiving cavity. Each adjacent two of the fan blades, the end plate and the first rotor core enclose an air inlet hole, and a plurality of the air inlet holes are communicated with the receiving cavity.

[0014] In one possible implementation:

[0015] The end plate is provided with a protrusion on the side facing the stator assembly. The fan blade comprises a first segment and a second segment, the first segment is integrally formed on the inner wall of the first rotor core, and the second segment is integrally formed between the protrusion and the first segment along the axial direction of the stator assembly, the height of the first segment is greater than the height of the second segment.

[0016] In one possible implementation:

[0017] The fan blade has a first surface and a second surface arranged oppositely, the first surface and the second surface are both planar, the first surface is substantially parallel to the axial direction of the stator assembly, and the second surface is substantially parallel to the axial direction of the stator assembly.

[0018] In one possible implementation:

[0019] The stator assembly comprises a yoke, a plurality of first tooth portions and a plurality of second tooth portions. The yoke is annular. The plurality of first tooth portions are annularly arranged on the outer side of the yoke. The plurality of second tooth portions are annularly arranged on the inner side of the yoke.

[0020] In one possible implementation:

[0021] The number of the first tooth portions is 6N, the number of the second tooth portions is 3N, N is a positive integer, each adjacent two of the first tooth portions forms a first tooth portion group, a plurality of the first tooth portion groups correspond to a plurality of the second tooth portions one by one, and one of the first tooth portions in each of the first tooth portion groups is arranged opposite to the second tooth portion along the radial direction of the stator assembly, and the other of the first tooth portions is arranged staggered to the second tooth portion.

[0022] The application further provides an electric tool comprising the motor. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0024] Figure 1 The structural schematic diagram of the electric tool of an embodiment of the present application.

[0025] Figure 2 The structural schematic diagram of the electric machine of an embodiment of the present application.

[0026] Figure 3 The structural schematic diagram of the electric machine of an embodiment of the present application. Figure 2 The sectional view at A-A in FIG. 1.

[0027] Figure 4 The exploded structural schematic diagram of the electric machine of an embodiment of the present application.

[0028] Figure 5 The axial view of the yoke, the first tooth portion and the second tooth portion of an embodiment of the present application.

[0029] Figure 6 The three-dimensional structural schematic diagram of the yoke, the first tooth portion and the second tooth portion of an embodiment of the present application.

[0030] Figure 7 The structural schematic diagram of the first rotor core and the fan structure of an embodiment of the present application.

[0031] Figure 8 The axial view of the first rotor core and the fan structure of an embodiment of the present application.

[0032] Figure 9 The side view of the first rotor core and the fan structure of an embodiment of the present application.

[0033] Figure 10 The sectional view at B-B in FIG. 1. Figure 7 The sectional view at B-B in FIG. 1.

[0034] Main element symbol explanation:

[0035]

[0036]

[0037] The following specific embodiments will further illustrate the present application in combination with the above drawings. Specific embodiments

[0038] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application but not all the embodiments of the present application.

[0039] It should be noted that when an element is referred to as being "fixed" to another element, it can be directly on the other element or intervening elements can also be present. When an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements can also be present. When an element is referred to as being "positioned on" another element, it can be directly on the other element or intervening elements can also be present. The terms "vertical", "horizontal", "left", "right" and similar expressions as used herein are for illustrative purposes only.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0041] Some embodiments of the present application are described in detail. The following embodiments and features of the embodiments can be combined with each other without conflict.

[0042] Referring to Figure 1 The present embodiment provides an electric tool 200, comprising a housing 201 and a motor 100. The motor 100 is arranged in the housing 201. The motor 100 is used to drive a load to rotate. Wherein, the motor 100 can be used to drive the implement of the electric tool 200 to move according to the requirement, so as to realize locking, releasing, cutting and other different functions. The motor 100 of the present embodiment can also be applied to cleaning equipment, automation equipment and other equipment.

[0043] Referring to Figure 2 and Figure 3 The motor 100 comprises a stator assembly 10, a first rotor assembly 20 and a second rotor assembly 50. The first rotor assembly 20 comprises a first rotor core 30 and a fan structure 40. The first rotor core 30 is sleeved on the stator assembly 10. The fan structure 40 is integrally formed on one end of the first rotor core 30 along the axial direction X of the stator assembly 10. The fan structure 40 is configured to rotate with the first rotor core 30. The second rotor assembly 50 is arranged on the inner side of the stator assembly 10.

[0044] According to the motor 100 of the embodiment, the first rotor assembly 20 is arranged outside the stator assembly 10, and the second rotor assembly 50 is arranged inside the stator assembly 10, so as to improve the space utilization of the inside and outside of the stator assembly 10 and improve the performance of the motor 100. Meanwhile, the fan structure 40 is integrally formed on the first rotor assembly 20, so as to improve the structural integration of the motor 100, reduce the volume of the motor 100, reduce the structural complexity of the motor 100, reduce the assembly difficulty of the motor 100, and reduce the possibility of the fan structure 40 falling off from the motor 100, ensure the stable operation of the fan structure 40, reduce the failure mode of the motor 100, and improve the working reliability of the motor 100. The fan structure 40 can reliably dissipate heat during the simultaneous operation of the first rotor assembly 20 and the second rotor assembly 50, so that the motor 100 of the embodiment can improve the performance and heat dissipation effect of the motor 100.

[0045] In some embodiments, referring to Figure 3 and Figure 4 , the motor 100 further comprises a surface-mounted magnet 61 arranged between the outer circumferential surface of the second rotor assembly 50 and the inner circumferential surface of the first rotor core 30. The surface-mounted magnet 61 is in a plurality. The plurality of surface-mounted magnets 61 are uniformly and spacedly distributed along the circumference of the first rotor core 30. The surface-mounted magnet 61 is used to form a magnetic field.

[0046] In some embodiments, referring to Figure 3 and Figure 4 , the motor 100 further comprises an output shaft 64. The output shaft 64 extends along the axial direction X of the motor 100. The output shaft 64 passes through the second rotor assembly 50. The output shaft 64 is fixedly connected with the second rotor assembly 50. The output shaft 64 is fixedly connected with the first rotor core 30. The output shaft 64 can be interference-fitted with the second rotor assembly 50 and the first rotor core 30. In other embodiments, the output shaft 64 can be connected with the second rotor assembly 50 and the first rotor core 30 through a fastening structure.

[0047] In some embodiments, referring to Figure 3 and Figure 4 , the second rotor assembly 50 comprises a rotor armature 51. The rotor armature 51 is arranged inside the stator assembly 10. The output shaft 64 passes through the rotor armature 51 and is connected with the rotor armature 51. The rotor armature 51 can generate a magnetic field to conduct a magnetic circuit and transmit the generated torque to the output shaft 64.

[0048] In some embodiments, referring to Figure 3 and Figure 4, the first rotor core 30 is provided with a receiving cavity Q, the receiving cavity Q is provided with an open end K4 at one end along the axial direction X of the motor 100, and the first rotor core 30 is integrally formed with the fan structure 40 at the end away from the open end K4 along the axial direction X. The stator assembly 10 is installed in the receiving cavity Q. The stator assembly 10 extends out of the receiving cavity Q at one end along the axial direction X of the motor 100.

[0049] In some embodiments, the first rotor core 30 comprises a surrounding wall. The surrounding wall surrounds the receiving cavity Q.

[0050] In some embodiments, the motor 100 further comprises a base 63 and a Hall plate 62. The base 63 is arranged at the end of the first rotor core 30 away from the fan structure 40 along the axial direction X. The base 63 is arranged spaced apart from the first rotor core 30. The base 63 is used to fixedly connect the stator assembly 10. One end of the output shaft 64 penetrates through the base 63, and there is a gap between the output shaft 64 and the base 63. The Hall plate 62 is arranged between the base 63 and the first rotor core 30 along the axial direction X. The Hall plate 62 is used to sense the position of the first rotor assembly 20 and the position of the second rotor assembly 50. The Hall plate 62 is also used to connect the first winding 14 and the second winding 15 with the external circuit of the motor 100, so as to realize power supply for the first winding 14 and the second winding 15.

[0051] In some embodiments, referring to Figure 3 and Figure 4 , the base 63 comprises a bottom plate 631 and a connecting portion 632. The bottom plate 631 is arranged spaced apart from the first rotor core 30 along the axial direction X. The connecting portion 632 is connected to the bottom plate 631 and extends towards the first rotor core 30. The connecting portion 632 penetrates through the Hall plate 62 and is connected to the stator assembly 10.

[0052] In some embodiments, referring to Figure 5 and Figure 6 , the stator assembly 10 comprises a yoke portion 11, a plurality of first tooth portions 12 and a plurality of second tooth portions 13. The yoke portion 11 is provided with a receiving hole K3, and the receiving hole K3 penetrates through the yoke portion 11 along the axial direction X of the motor 100. The yoke portion 11 is annular. The plurality of first tooth portions 12 are annularly arranged on the outer side of the yoke portion 11. The plurality of first tooth portions 12 can be uniformly and spacedly distributed along the circumferential direction of the yoke portion 11. The plurality of first tooth portions 12 are protrudingly arranged on the outer circumferential surface of the yoke portion 11. The plurality of second tooth portions 13 are annularly arranged on the inner side of the yoke portion 11. The plurality of second tooth portions 13 can be uniformly and spacedly distributed along the circumferential direction of the yoke portion 11. The plurality of second tooth portions 13 are protrudingly arranged on the hole surface of the receiving hole K3. The stator assembly 10 further comprises a plurality of first windings 14 and a plurality of second windings 15. The number of the first windings 14 is the same as the number of the first tooth portions 12, and the plurality of first windings 14 are wound on the first tooth portions 12 one by one. The number of the second windings 15 is the same as the number of the second tooth portions 13, and the plurality of second windings 15 are wound on the second tooth portions 13 one by one.

[0053] In some embodiments, the yoke 11, the plurality of first teeth 12 and the plurality of second teeth 13 can be configured as an integrally formed structure with high strength.

[0054] The first rotor assembly 20 is disposed outside the plurality of first teeth 12. The second rotor assembly 50 is disposed inside the receiving hole K3 and inside the plurality of second teeth 13.

[0055] In some embodiments, referring to Figure 5 and Figure 6 , the number of the first teeth 12 is 6N, the number of the second teeth 13 is 3N, N is a positive integer, each adjacent two first teeth 12 form a first teeth group, the plurality of first teeth groups correspond to the plurality of second teeth 13 one by one, and one first tooth 12 of each first teeth group is disposed in radial alignment with a second tooth 13, and the other first tooth 12 is disposed staggered with a second tooth 13.

[0056] In other embodiments, the first teeth 12 and the second teeth 13 can also be distributed staggered in the circumferential direction of the yoke 11.

[0057] In some embodiments, referring to Figure 7 , the fan structure 40 includes a plurality of fan blades 41, one end of the plurality of fan blades 41 is integrally formed with the first rotor core 30, the other end of the plurality of fan blades 41 is integrally formed with each other, and the plurality of fan blades 41 are uniformly distributed in the circumferential direction of the stator assembly 10 at the end integrally formed with the first rotor core 30.

[0058] In this way, during rotation of the first rotor core 30 driving the plurality of fan blades 41, the space between adjacent two fan blades 41 can allow air to pass through, thereby forming an air flow circulating into the receiving cavity Q.

[0059] In some embodiments, referring to Figure 8 , the fan blade 41 has a first surface P1 and a second surface P2 disposed opposite to each other, the first surface P1 and the second surface P2 are both planar, the first surface P1 is substantially parallel to the axial direction X of the stator assembly 10, and the second surface P2 is substantially parallel to the axial direction X of the stator assembly 10.

[0060] In other embodiments, the first surface P1 and the second surface P2 can also be configured as different surfaces such as curved surfaces, inclined surfaces, etc. In the radial direction of the motor 100, the fan blade 41 can be configured as an equal-thickness structure or an unequal-thickness structure.

[0061] In some embodiments, the stator assembly 10 has an axis L, and the fan structure 40 is configured to rotate around the axis L under the driving of the first rotor core 30. Referring to Figure 7 andFigure 8 The plurality of blades 41 are distributed radially around the axis L. In this way, a more uniform airflow can be formed during rotation of the fan structure 40, so as to improve the uniformity of heat dissipation of the fan structure 40.

[0062] In some embodiments, referring to Figure 9 and Figure 10 , the fan structure 40 further comprises an end plate 42. The end plate 42 is spaced apart from the first rotor core 30 along the axial direction X of the stator assembly 10. The plurality of blades 41 are integrally formed at one end of the end plate 42 away from the first rotor core 30. The end plate 42 can improve the connection strength between the fan structure 40 and the first rotor core 30, ensure the overall strength of the motor 100, and prolong the service life of the motor 100.

[0063] In some embodiments, referring to Figure 9 and Figure 10 , the first rotor core 30 defines a receiving cavity Q. Each adjacent two blades 41, end plates 42 and first rotor cores 30 enclose an air inlet hole K1, and a plurality of air inlet holes K1 are communicated with the receiving cavity Q. The air inlet hole K1 is formed in the side surface of the first rotor core 30. In this way, during rotation of the fan structure 40 around the axis L driven by the first rotor core 30, air outside the receiving cavity Q can enter the receiving cavity Q through the air inlet hole K1 and form an airflow to dissipate heat from the stator assembly 10 and the second rotor assembly 50.

[0064] In some embodiments, referring to Figure 2 , a gap G is provided between the stator assembly 10 and the end plate 42 to facilitate the introduction of the airflow.

[0065] In other embodiments, the end plate 42 can also be provided with a plurality of through holes. One through hole is provided between each adjacent two blades 41 to allow the airflow to enter the receiving cavity Q from one side of the end plate 42.

[0066] In some embodiments, referring to Figure 9 and Figure 10 , the side surface of the end plate 42 facing the stator assembly 10 is provided with a protrusion 43. The blade 41 comprises a first section 411 integrally formed on the inner wall of the first rotor core 30 and a second section 412 integrally formed between the side surface of the protrusion 43 and the first section 411. Along the axial direction X of the stator assembly 10, the height of the first section 411 is greater than the height of the second section 412. In this way, the connection stability of the blade 41 and the end plate 42 can be improved, and the operation reliability of the fan structure 40 can be ensured.

[0067] In some embodiments, referring to Figure 10 , the protrusion 43 is provided with a fixing hole K2 penetrating along the axial direction X. A portion of the output shaft 64 is fitted into the fixing hole K2 and extends to the side of the end plate 42 away from the opening K4.

[0068] The above embodiments are only used to illustrate the technical solutions of the present application but not to limit the present application. Although the present application is explained in detail with reference to the above preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or equivalent replaced without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. An electric motor, characterized in that, include: Stator assembly; A first rotor assembly, comprising a first rotor core and a fan structure, wherein the first rotor core is sleeved on the stator assembly, and the fan structure is integrally formed on one end of the first rotor core along the axial direction of the stator assembly, and the fan structure is configured to rotate with the rotation of the first rotor core. The second rotor assembly is located inside the stator assembly.

2. The motor according to claim 1, characterized in that: The fan structure includes multiple fan blades, one end of which is integrally formed into the first rotor core, and the other ends of which are interconnected and integrally formed. The ends of which are integrally formed with the first rotor core are evenly distributed along the circumference of the stator assembly.

3. The motor according to claim 2, characterized in that: The stator assembly has an axis, and the fan structure is configured to rotate about the axis under the drive of the first rotor core; The multiple fan blades are radially distributed around the axis.

4. The motor according to claim 2, characterized in that: The fan structure also includes an end plate, which is spaced apart from the first rotor core along the axial direction of the stator assembly; one end of the plurality of fan blades opposite to the first rotor core is integrally formed on the end plate.

5. The motor according to claim 4, characterized in that: The first rotor core defines the receiving cavity; Each pair of adjacent fan blades, end plates, and the first rotor core forms an air inlet, and all of the air inlets are connected to the receiving cavity.

6. The motor according to claim 4, characterized in that: The end plate has a protrusion on the side facing the stator assembly; The fan blade includes a first section and a second section. The first section is integrally formed on the inner wall of the first rotor core, and the second section is integrally formed between the protrusion and the first section. Along the axial direction of the stator assembly, the height of the first section is greater than the height of the second section.

7. The motor according to any one of claims 2 to 6, characterized in that: The fan blade has a first surface and a second surface arranged opposite to each other. Both the first surface and the second surface are planes. The first surface is substantially parallel to the axial direction of the stator assembly, and the second surface is substantially parallel to the axial direction of the stator assembly.

8. The motor according to any one of claims 1 to 6, characterized in that, The stator assembly includes: The yoke is annular; A plurality of first teeth are arranged around the outside of the yoke; Multiple second teeth are arranged around the inner side of the yoke.

9. The motor according to claim 8, characterized in that: The number of first teeth is 6N, and the number of second teeth is 3N, where N is a positive integer. Each pair of adjacent first teeth forms a group of first teeth. Multiple groups of first teeth correspond one-to-one with multiple groups of second teeth. In each group of first teeth, one first tooth and one second tooth are arranged directly opposite each other along the radial direction of the stator assembly, while the other first tooth and one second tooth are staggered.

10. A power tool, characterized in that, Includes the motor as described in any one of claims 1 to 9.

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