Electric tool and motor

Abstract

The utility model discloses an electric tool and a motor. The electric tool comprises a shell; the working head can be driven for working; the motor is accommodated in the shell, the motor comprises a stator assembly and a rotor assembly, the stator assembly comprises a stator iron core, and the rotor assembly comprises a rotor shaft, a rotor iron core and a plurality of magnetic steels; the plurality of magnetic steels extend along the axial direction of the rotor shaft, and are uniformly distributed and fixed on the outer surface of the rotor core; the rotor core comprises a plurality of limiting parts, and the limiting parts are arranged between adjacent magnetic steels of the plurality of magnetic steels and used for limiting the magnetic steels from being separated from the rotor core. By the adoption of the technical scheme, the magnetic steel of the motor rotor assembly of the electric tool is not prone to disengagement.

Description

Technical Field

[0001] The present application relates to a power tool, and in particular to an electric tool and a motor. Background Art

[0002] In daily production and life, power tools play a very important role. Power tools include but are not limited to hand drills, impact drills, impact wrenches, impact screwdrivers, angle grinders, etc. Hand drills and impact drills can be equipped with drill bits of different diameters to drill holes on objects, impact wrenches are used to tighten bolts and nuts, impact screwdrivers usually loosen or tighten screws, etc., and angle grinders can grind and cut objects. The use of power tools can improve work efficiency and reduce labor intensity.

[0003] During the assembly process of the motor in the existing power tool, the magnet is simply glued to the iron core of the motor rotor. For low-speed motors and power tools with not very harsh working conditions, this process is sufficient to meet the use requirements. However, for high-power, high-speed motors, the bonding magnet process has many uncertain failure factors, which will cause the magnet to fall off and shift during the rotation of the motor.

[0004] This section provides background information related to the present application which is not necessarily prior art. Utility Model Content

[0005] One object of the present application is to solve or at least alleviate part or all of the above problems. To this end, one object of the present application is to provide an electric tool and a motor in which the magnetic steel of the motor rotor assembly is not easily separated.

[0006] In order to achieve the above objectives, this application adopts the following technical solutions:

[0007] An electric tool, comprising:

[0008] shell;

[0009] A working head capable of being driven for working;

[0010] The motor is contained in the housing, the motor comprises a stator assembly and a rotor assembly, the stator assembly comprises a stator core, the rotor assembly comprises a rotor shaft, a rotor core and a plurality of magnetic steels; the plurality of magnetic steels extend along the axial direction of the rotor shaft, and the plurality of magnetic steels are evenly distributed and fixed on the outer surface of the rotor core;

[0011] The rotor core comprises a plurality of limiting parts, wherein the limiting parts are arranged between adjacent magnetic steels of the plurality of magnetic steels, and the limiting parts limit the magnetic steels from being separated from the rotor core.

[0012] In some embodiments, in the radial direction of the motor, the limiting portion protrudes from the magnetic steel.

[0013] In some embodiments, the limiting portion includes a first limiting protrusion and a second limiting protrusion, and the first limiting protrusion and the second limiting protrusion are formed on the left and right sides of the limiting portion.

[0014] In some embodiments, in the radial direction of the motor, the first limiting protrusion and the second limiting protrusion are in contact with the magnetic steel to limit the radial movement of the magnetic steel.

[0015] In some embodiments, the rotor core includes a plurality of protrusions extending in the axial direction of the rotor shaft, and adjacent magnetic steels are arranged on both sides of the protrusions.

[0016] In some embodiments, in the radial direction of the motor, the magnetic steel protrudes from the protrusion.

[0017] In some embodiments, the limiting portion includes at least a first limiting portion and a second limiting portion, the first limiting portion is formed at the first end of the protrusion, and the second limiting portion is formed at the second end of the protrusion, and the second end is axially opposite to the first end.

[0018] In some embodiments, the rotor core and the limiting portion are an integrally formed structure.

[0019] In some embodiments, the stator assembly is disposed on the periphery of the rotor assembly.

[0020] In some embodiments, in the axial direction of the motor, the length of the rotor core is greater than the length of the stator core.

[0021] In some embodiments, the outer diameter of the stator core is less than or equal to 32 mm.

[0022] A motor, comprising:

[0023] A stator assembly, including a stator core,

[0024] A rotor assembly, comprising a rotor shaft, a rotor core and a plurality of magnetic steels;

[0025] A plurality of magnetic steels extend along the axial direction of the rotor shaft, and the plurality of magnetic steels are evenly distributed and fixed on the outer surface of the rotor core;

[0026] The rotor core comprises a plurality of limiting parts, which are arranged between adjacent magnetic steels of the plurality of magnetic steels and are used to limit the magnetic steels from being separated from the rotor core.

[0027] The benefits of this application are:

[0028] The electric tool provided in the present application can ensure that the magnet is stably arranged on the rotor core. Even if the motor of the electric tool rotates at high speed, the limiting effect of the limiting part can prevent the magnet from falling off or shifting. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a perspective view of an electric tool according to an embodiment;

[0030] Figure 2 is a schematic diagram of a motor according to an embodiment;

[0031] Figure 3 yes Figure 2 A top view of the motor in FIG.

[0032] Figure 4 is a side view of a motor in which the rotor core length is greater than the stator core length according to an embodiment;

[0033] Figure 5 is a perspective view of a rotor assembly of an embodiment;

[0034] Figure 6 yes Figure 5 A three-dimensional diagram of the rotor core in FIG.

[0035] Figure 7 is a front view of a rotor assembly of an embodiment;

[0036] Figure 8 It is a front view of a magnetic steel sleeve protective sleeve according to one embodiment.

[0037] In the figure:

[0038] 100, circular saw; 200, housing; 300, working head; 400, motor; 410, stator assembly; 411, stator core; 412, coil; 420, rotor assembly; 421, rotor core; 4211, protrusion; 4212, limiting portion; 42121, first limiting protrusion; 42122, second limiting protrusion; 42123, limiting body; 422, magnetic steel; 423, rotor shaft; 424, first rotor punching sheet; 4241, first limiting portion; 425, second rotor punching sheet; 4251, second limiting portion; 426, protective cover; 430, fan. DETAILED DESCRIPTION

[0039] Before any embodiments of the application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the above drawings.

[0040] In this application, the terms "comprises", "includes", "has" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device that includes the element.

[0041] In this application, the term "and / or" is a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects before and after are in an "and / or" relationship.

[0042] In the present application, the terms "connect", "combine", "couple", and "install" may refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, direct connection refers to two parts or components being connected together without the need for an intermediate piece, and indirect connection refers to two parts or components being connected to at least one intermediate piece respectively, and the two parts or components being connected via the intermediate piece. In addition, "connect" and "couple" are not limited to physical or mechanical connections or couplings, and may include electrical connections or couplings.

[0043] In the present application, it will be understood by those of ordinary skill in the art that relative terms (e.g., "about," "approximately," "substantially," etc.) used in conjunction with quantities or conditions include the values ​​and have the meaning indicated by the context. For example, the relative terms include at least the degree of error associated with the measurement of a specific value, the tolerances caused by manufacturing, assembly, and use associated with a specific value, and the like. Such terms should also be considered to disclose a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to plus or minus a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​that do not use relative terms should also be disclosed as specific values ​​with tolerances. In addition, "substantially" may refer to plus or minus a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) on the basis of the indicated angle when expressing a relative angular position relationship (e.g., substantially parallel, substantially perpendicular).

[0044] In this application, it will be understood by those skilled in the art that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0045] In the present application, the terms "upper", "lower", "left", "right", "front", "back" and other directional words are described based on the orientation and positional relationship shown in the accompanying drawings, and should not be understood as limiting the embodiments of the present application. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to another element "upper" or "lower", but also indirectly connected to another element "upper" or "lower" through an intermediate element. It should also be understood that directional words such as upper side, lower side, left side, right side, front side, back side, etc. not only represent the positive orientation, but can also be understood as the lateral orientation. For example, the bottom can include directly below, lower left, lower right, lower front, and lower back, etc.

[0046] In daily production and life, power tools play a very important role. Power tools include a housing, a motor and a working head. The motor is housed in the housing, and the working head is connected to the output shaft of the motor, and the working head can be driven to work. Different power tools can be configured by replacing different working heads. Including but not limited to hand drills, impact drills, impact wrenches, impact screwdrivers, angle grinders, etc. Hand drills and impact drills can be equipped with drill bits of different diameters to drill holes in objects, impact wrenches are used to tighten bolts and nuts, impact screwdrivers usually loosen or tighten screws, etc., and angle grinders can grind and cut objects. The use of power tools can improve work efficiency and reduce labor intensity.

[0047] The electric tools to which the technical solution of the present application is applicable include handheld electric tools, fastening electric tools, cutting electric tools, grinding electric tools, gardening electric tools, etc. For example, electric tools such as hair dryers, electric drills, electric circular saws, reciprocating saws, impact wrenches, impact screwdrivers, hammer drills, lawn mowers, and snow blowers. Other types of electric tools can fall within the protection scope of the present application as long as they can adopt the substantive content of the technical solution disclosed below.

[0048] like Figure 1 As shown, the present application provides an electric tool, which may be a circular saw 100. As an optional implementation, the circular saw 100 is taken as an example for description below.

[0049] like Figure 1-Figure 7As shown, the circular saw 100 includes a housing 200, a working head 300 and a motor 400. The working head 300 can be driven for working. The motor 400 is accommodated in the housing 200, and the motor 400 includes a stator assembly 410 and a rotor assembly 420. The stator assembly 410 includes a stator core 411, and the rotor assembly 420 includes a rotor shaft 423, a rotor core 421 and a plurality of magnets 422; the plurality of magnets 422 extend along the axial direction of the rotor shaft 423, and the plurality of magnets 422 are evenly distributed and fixed on the outer surface of the rotor core 421; the rotor core 421 includes a plurality of limiting portions 4212, and the limiting portions 4212 are arranged between adjacent magnets 422 of the plurality of magnets 422, and the limiting portions 4212 are used to limit the magnets 422 from being separated from the rotor core 421.

[0050] Compared with the prior art in which the magnet 422 is merely bonded to the outer surface of the rotor core 421, in the present application, the magnet 422 can be limited by providing a limiting portion 4212, thereby ensuring that the magnet 422 is stably provided on the rotor core 421. Even when the motor 400 of the circular saw 100 is rotating at high speed, the limiting effect of the limiting portion 4212 can prevent the magnet 422 from falling off or shifting.

[0051] like Figure 2 and Figure 3 As shown, in some embodiments, the stator assembly 410 is arranged on the periphery of the rotor assembly 2. The stator core 411 of the stator assembly 410 is sleeved on the rotor core 421 to form an inner rotor motor 400. It is convenient to use the rotor shaft 423 fixedly penetrated on the rotor core 421 as an output shaft to be connected to the working head 300 in transmission. In addition, the above structure is used to form an inner rotor brushless motor. By controlling the current direction of the coil 12 in the stator assembly 410, the polarity of the coil 12 can be controlled, and the magnetic steel 422 on the rotor core 421 is matched to drive the rotor shaft 423 fixedly penetrated on the rotor core 421 to rotate.

[0052] like Figure 7 and Figure 8 As shown, in some embodiments, a fan 430 is fixedly sleeved on the rotor shaft 423. During the rotation of the rotor core 421, the fan 430 rotates synchronously to play a role in heat dissipation.

[0053] like Figure 5As shown, in some embodiments, in the radial direction of the motor 400, the limiting portion 4212 protrudes from the magnetic steel 422. Since the limiting portion 4212 protrudes relative to the magnetic steel 422, a part of the structure of the limiting portion 4212 is located outside the magnetic steel 422 in the radial direction, and the projection of the part of the structure of the limiting portion 4212 in the radial direction covers a part of the magnetic steel 422, so that the magnetic steel 422 can be limited in the radial direction to prevent the magnetic steel 422 from being separated from the rotor core 421 under the action of centrifugal force during the high-speed rotation of the motor 400.

[0054] like Figure 5 As shown, in some embodiments, the limiting portion 4212 includes a first limiting protrusion 42121 and a second limiting protrusion 42122, and the first limiting protrusion 42121 and the second limiting protrusion 42122 are formed on the left and right sides of the limiting body 42123 of the limiting portion 4212. The first limiting protrusion 42121 extends in a direction away from the limiting body 42123, and the second limiting protrusion 42122 extends in a direction away from the limiting body 42123. Since the first limiting protrusion 42121 and the second limiting protrusion 42122 are located on the outside of the magnetic steel 422, the magnetic steel 422 located on both sides of the limiting portion 4212 can be limited in the radial direction of the motor 400. Optionally, the first limiting protrusion 42121, the second limiting protrusion 42122 and the limiting body 42123 are integrally formed, and do not need to be assembled to form the limiting portion 4212. Optionally, the first limiting protrusion 42121, the second limiting protrusion 42122 and the limiting body 42123 are formed separately, and the limiting portion 4212 is formed by respectively installing the first limiting protrusion 42121 and the second limiting protrusion 42122 to the limiting body 42123. Wherein, when the first limiting protrusion 42121, the second limiting protrusion 42122 and the limiting body 42123 are formed separately, the present application does not limit the specific manner in which the first limiting protrusion 42121 and the second limiting protrusion 42122 are installed to the limiting body 42123, and the first limiting protrusion 42121 and the second limiting protrusion 42122 can be firmly installed to the limiting body 42123 in any manner, and will not fall off from the limiting body 42123 during the high-speed rotation of the motor 400.

[0055] like Figure 5As shown, in some embodiments, in the radial direction of the motor 400, the first limiting protrusion 42121 and the second limiting protrusion 42122 are in contact with the magnetic steel 422. When the magnetic steel 422 is subjected to centrifugal force and generates centrifugal motion, the magnetic steel 422 will abut against the first limiting protrusion 42121 and the second limiting protrusion 42122, and the first limiting protrusion 42121 and the second limiting protrusion 42122 limit the radial movement of the magnetic steel 422. The magnetic steel 422 is designed to be arc-shaped or tile-shaped. After the magnetic steel 422 is fixed to the outer surface of the rotor core 421, the first limiting protrusion 42121 and the second limiting protrusion 42122 can limit the magnetic steel 422 located on both sides of the limiting portion 4212 to prevent the magnetic steel 422 from moving relative to the radial direction of the motor 400.

[0056] like Figure 5 As shown, in some embodiments, the rotor core 421 includes a plurality of protrusions 4211, and the plurality of protrusions 4211 extend along the axial direction of the rotor shaft 423, and adjacent magnetic steels 422 are arranged on both sides of the protrusions 4211. During assembly, the magnetic steel 422 is embedded or inserted between two adjacent protrusions 4211. In one embodiment, four protrusions 4211 are provided, and the four protrusions 4211 are fixedly arranged on the rotor core 421 at equal intervals. Adjacent magnetic steels 422 are separated by the protrusions 4211. By providing the protrusions 4211, adjacent magnetic steels 422 can be separated, which facilitates the positioning and assembly of the magnetic steels 422 on the rotor core 421. In other embodiments, the number of protrusions 4211 can also be set as needed, and no excessive restrictions are made here. Optionally, the rotor core 421 and the protrusions 4211 are integrally formed, and no assembly is required to form the limiting portion 4212. Optionally, the rotor core 421 and the protrusion 4211 are formed separately, and the protrusion 4211 is mounted on the rotor core 421. When the rotor core 421 and the protrusion 4211 are formed separately, the present application does not limit the specific manner in which the protrusion 4211 is mounted on the rotor core 421, and the protrusion 4211 can be securely mounted on the rotor core 421 in any manner, and will not fall off the rotor core 421 during high-speed rotation of the motor 400.

[0057] like Figure 5 As shown, in some embodiments, in the radial direction of the motor 400, the magnetic steel 422 protrudes from the protrusion 4211. Through the above arrangement, the thickness of the magnetic steel 422 can be guaranteed, thereby ensuring the magnetic torque of the interaction between the magnetic steel 422 and the stator assembly 410. The motor 400 can output a larger torque.

[0058] like Figure 6As shown, in some embodiments, the limiting portion 4212 includes at least a first limiting portion 4241 and a second limiting portion 4251, the first limiting portion 4241 is formed at the first end of the protruding portion 4211, and the second limiting portion 4251 is formed at the second end of the protruding portion 4211, and the second end is axially opposite to the first end. Optionally, the first limiting portion 4241, the second limiting portion 4251 and the protruding portion 4211 are integrally formed and do not need to be assembled. Optionally, the first limiting portion 4241, the second limiting portion 4251 and the protruding portion 4211 are formed separately, and the first limiting portion 4241 and the second limiting portion 4251 are respectively installed at the two ends of the protruding portion 4211. Among them, when the first limiting portion 4241 and the second limiting portion 4251 and the protrusion 4211 are formed separately, the present application does not limit the specific manner in which the first limiting portion 4241 and the second limiting portion 4251 are installed to the protrusion 4211. The first limiting portion 4241 and the second limiting portion 4251 can be firmly installed to the protrusion 4211 in any manner, and will not fall off from the protrusion 4211 during the high-speed rotation of the motor 400. In other embodiments, the first rotor punching 424 and the second rotor punching 425 can also be fixedly installed at both ends of the rotor core 421, and the first rotor punching 424 and the second rotor punching 425 are coaxially arranged with the rotor core 421. The first limiting portion 4241 is formed on the first rotor punching 424, and the second limiting portion 4251 is formed on the second rotor punching 425. Similarly, the magnetic steel 422 can be limited in the radial direction of the motor 400.

[0059] like Figure 5 As shown, in some embodiments, the rotor core 421 and the limiting portion 4212 are an integrally formed structure. The rotor core 421 can be integrally formed with the limiting portion 4212 by casting or machining, which can ensure that the rotor core 421 is stably connected to the limiting portion 4212 and facilitate the subsequent assembly of the motor 400. Optionally, in other embodiments, the rotor core 421 and the limiting portion 4212 are formed separately, and the limiting portion 4212 is installed on the rotor core 421. Among them, when the rotor core 421 and the limiting portion 4212 are formed separately, the present application does not limit the specific method of installing the limiting portion 4212 to the rotor core 421, and the limiting portion 4212 can be firmly installed to the rotor core 421 in any manner, and will not fall off from the rotor core 421 during the high-speed rotation of the motor 400.

[0060] like Figure 2 and Figure 4As shown, in some embodiments, in the axial direction of the motor 400, the length L2 of the rotor core 421 is greater than the length L1 of the stator core 411. The rotor core 421 and the stator core 411 are both axially symmetrical, and the ratio of the length L2 of the rotor core 421 to the length L1 of the stator core 411 is less than or equal to 1.35. Optionally, the ratio of the length L2 of the rotor core 421 to the length L1 of the stator core 411 may be 1.34. Optionally, the ratio of the length L2 of the rotor core 421 to the length L1 of the stator core 411 may be 1.33. Optionally, the ratio of the length L2 of the rotor core 421 to the length L1 of the stator core 411 may be 1.32. Optionally, the ratio of the length L2 of the rotor core 421 to the length L1 of the stator core 411 may be 1.31. The length of the rotor core 421 and the magnetic steel 422 is generally greater than or equal to the length L1 of the stator core 411, and the difference between the length of the rotor core 421 and the magnetic steel 422 and the length L1 of the stator core 411 is greater than or equal to 1 mm, and less than or equal to 5 mm. Optionally, the difference between the length of the rotor core 421 and the magnetic steel 422 and the length L1 of the stator core 411 can be 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, etc. By setting the length L2 of the rotor core 421 to be greater than or equal to the length L1 of the stator core 411, the axial unbalanced tension caused by the axial movement of the rotor core 421 can be reduced; and an additional end magnetic field can be provided, thereby improving the performance of the motor 400.

[0061] In some embodiments, the outer diameter of the stator core 411 is less than or equal to 32 mm. Optionally, the outer diameter of the stator core 411 is greater than or equal to 26 mm and less than or equal to 32 mm. Optionally, the outer diameter of the stator core 411 can be 27 mm, and optionally, the outer diameter of the stator core 411 can be 28 mm. By limiting the outer diameter of the stator core 411, it is possible to ensure that the motor 400 outputs torque while avoiding excessive volume and weight of the motor 400, which results in poor practicality of electric work using the motor 400.

[0062] In some embodiments, the rated power of the motor 400 is greater than or equal to 40 W. Optionally, the rated power of the motor 400 may be 40 W. Optionally, the rated power of the motor 400 may be 41 W. Optionally, the rated power of the motor 400 may be 42 W. By limiting the rated output power of the motor 400, it is possible to ensure that the output power of the circular saw 100 made using the motor 400 can meet the use requirements of the construction site.

[0063] like Figure 7As shown, in some embodiments, the limiting portion 4212 includes a first limiting protrusion 42121 and a second limiting protrusion 42122, and the first limiting protrusion 42121 and the second limiting protrusion 42122 are formed on the left and right sides of the protrusion 4211. The first limiting protrusion 42121 and the second limiting protrusion 42122 both extend axially along the rotor core 421. The magnetic steel 422 is inserted between adjacent protrusions 4211, and the edge of the magnetic steel 422 extending axially along the rotor core 421 contacts the inner side of the first limiting protrusion 42121 and the second limiting protrusion 42122. Since the first limiting protrusion 42121 and the second limiting protrusion 42122 are located on the outside of the magnetic steel 422, the edge of the magnetic steel 422 can be blocked, so that the magnetic steel 422 located on both sides of the protrusion 4211 is limited in the radial direction of the motor 400. Optionally, the first limiting protrusion 42121, the second limiting protrusion 42122 and the raised portion 4211 are integrally formed and do not require assembly. Optionally, the first limiting protrusion 42121, the second limiting protrusion 42122 and the raised portion 4211 are formed separately, and the first limiting protrusion 42121 and the second limiting protrusion 42122 are respectively mounted to the raised portion 4211. Among them, when the first limiting protrusion 42121, the second limiting protrusion 42122 and the raised portion 4211 are formed separately, the present application does not limit the specific manner in which the first limiting protrusion 42121 and the second limiting protrusion 42122 are mounted to the raised portion 4211. The first limiting protrusion 42121 and the second limiting protrusion 42122 can be securely mounted to the raised portion 4211 in any manner, and will not fall off from the raised portion 4211 during the high-speed rotation of the motor 400.

[0064] like Figure 8 As shown, in some embodiments, a protective sleeve 426 is provided outside the fixed sleeve of the magnetic steel 422. The protective sleeve 426 is non-magnetic and can be made of metal or carbon fiber and other materials. The thickness of the protective sleeve 426 is 0.2mm-0.3mm. Optionally, the thickness of the protective sleeve 426 is 0.21mm. Optionally, the thickness of the protective sleeve 426 is 0.22mm. By providing the protective sleeve 426, the annular inner wall surface of the protective sleeve 426 contacts the magnetic steel 422, so that the magnetic steel 422 can be limited in the radial direction. The end face of the protective sleeve 426 contacts the end face of the magnetic steel 422, so that the magnetic steel 422 is limited in the axial direction. By providing the protective sleeve 426, when the limiting portion 4212 is not provided on the rotor core 421, the magnetic steel 422 can also be protected and limited, so as to limit the magnetic steel 422 from detaching from the rotor core 421. The structural stability of the rotor assembly 420 is further improved, and the protective cover 426 can prevent magnetic leakage, thereby further improving the performance of the motor.

[0065] like Figure 2-Figure 6As shown, this embodiment also provides a motor, including a stator assembly 1 and a rotor assembly 2. The stator assembly 1 includes a stator core 11. The rotor assembly 2 includes a rotor shaft 23, a rotor core 21 and a plurality of magnets 22. The plurality of magnets 22 extend along the axial direction of the rotor shaft 23, and the plurality of magnets 22 are evenly distributed and fixed on the outer surface of the rotor core 21; the rotor core 21 includes a plurality of limiting portions 212, and the limiting portions 212 are arranged between adjacent magnets 22 of the plurality of magnets 22, and are used to limit the magnets 22 from being separated from the rotor core 21.

[0066] Compared with the prior art in which the magnet 422 is merely bonded to the outer surface of the rotor core 421, in the present application, the magnet 422 can be limited by providing a limiting portion 4212, thereby ensuring that the magnet 422 is stably provided on the rotor core 421. Even when the motor 400 of the circular saw 100 is rotating at high speed, the limiting effect of the limiting portion 4212 can prevent the magnet 422 from falling off or shifting.

[0067] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the above embodiments do not limit the present application in any form, and any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the present application.

Claims

1. An electric tool comprising: Housing (200); A working head (300) capable of being driven for working; A motor (400) is accommodated in the housing (200), the motor (400) comprising a stator assembly (410) and a rotor assembly (420), the stator assembly (410) comprising a stator core (411), the rotor assembly (420) comprising a rotor shaft (423), a rotor core (421), and a plurality of magnetic steels (422); the plurality of magnetic steels (422) extend along the axial direction of the rotor shaft (423), and the plurality of magnetic steels (422) are evenly distributed and fixed on the outer surface of the rotor core (421); It is characterized in that the rotor core (421) comprises a plurality of limiting portions (4212), wherein the limiting portions (4212) are arranged between adjacent magnetic steels (422) of the plurality of magnetic steels (422), and the limiting portions (4212) limit the magnetic steels (422) from detaching from the rotor core (421).

2. The electric tool according to claim 1, characterized in that: In the radial direction of the motor (400), the limiting portion (4212) protrudes from the magnetic steel (422).

3. The electric tool according to claim 1, characterized in that: The limiting portion (4212) comprises a first limiting protrusion (42121) and a second limiting protrusion (42122), wherein the first limiting protrusion (42121) and the second limiting protrusion (42122) are formed on the left and right sides of the limiting portion (4212).

4. The electric tool according to claim 3, characterized in that: In the radial direction of the motor (400), the first limiting protrusion (42121) and the second limiting protrusion (42122) are in contact with the magnetic steel (422), limiting the movement of the magnetic steel (422) in the radial direction.

5. The electric tool according to claim 1, characterized in that: The rotor core (421) comprises a plurality of protrusions (4211), wherein the plurality of protrusions (4211) extend along the axial direction of the rotor shaft (423), and adjacent magnetic steels (422) are arranged on both sides of the protrusions (4211).

6. The electric tool according to claim 5, characterized in that: In the radial direction of the motor (400), the magnetic steel (422) protrudes from the protruding portion (4211).

7. The electric tool according to claim 5, characterized in that: The limiting portion (4212) includes at least a first limiting portion (4241) and a second limiting portion (4251), wherein the first limiting portion (4241) is formed at a first end of the protruding portion (4211), and the second limiting portion (4251) is formed at a second end of the protruding portion (4211), and the second end is axially opposite to the first end.

8. The electric tool according to claim 1, characterized in that: The rotor core (421) and the limiting portion (4212) are an integrally formed structure.

9. The electric tool according to claim 1, characterized in that: The stator assembly (410) is disposed on the periphery of the rotor assembly (420).

10. The electric tool according to claim 1, characterized in that: In the axial direction of the motor (400), the length of the rotor core (421) is greater than the length of the stator core (411).

11. The electric tool according to claim 1, characterized in that: The outer diameter of the stator core (411) is less than or equal to 32 mm.

12. A motor, comprising: The stator assembly (410) includes a stator core (411). A rotor assembly (420) comprising a rotor shaft (423), a rotor core (421) and a plurality of magnetic steels (422); The plurality of magnetic steels (422) extend along the axial direction of the rotor shaft (423), and the plurality of magnetic steels (422) are evenly distributed and fixed on the outer surface of the rotor core (421); It is characterized in that the rotor core (421) comprises a plurality of limiting portions (4212), and the limiting portions (4212) are arranged between adjacent magnetic steels (422) of the plurality of magnetic steels (422) and are used to limit the magnetic steels (422) from detaching from the rotor core (421).

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