CN218868079U - Motor and electric tool - Google Patents

Abstract

The application discloses a motor and an electric tool. The motor comprises a motor shaft, a stator, a rotor, a first fixing piece and a second fixing piece, wherein the rotor comprises a sleeve and a magnet, the sleeve is provided with a first end and a second end which are arranged oppositely in the axial direction, the first fixing piece is arranged at the first end of the sleeve and comprises a plurality of first protruding parts arranged at intervals, and the second fixing piece is arranged at the second end of the sleeve and comprises a plurality of second protruding parts arranged at intervals. The first fixing piece further comprises a ring plate, at least part of the first protruding portion is arranged on the ring plate in a protruding mode, and the height of at least part of the first protruding portion is at least larger than half of the thickness of the ring plate. The motor utilizes the first fixing piece and the second fixing piece to limit the movement of the magnet in the axial direction and the radial direction of the sleeve, so that the magnet is stably fixed on the sleeve, and the probability of the magnet accidentally disengaging from the sleeve is reduced.

Description

Motor and electric tool

Technical Field

The application relates to the field of electric tools, in particular to a motor and an electric tool.

Background

The motor is a power device in the electric tool, the rotor is an important component of the motor, and the rotor comprises magnetic steel and a sleeve. The magnet steel of the rotor of current motor generally only directly bonds at telescopic internal surface through glue, and the connected mode that bonds leads to the joint strength of magnet steel on the sleeve less, and especially when the motor carries out the use in the equipment that the vibration is great or the temperature rise, the easy emergence magnet steel breaks away from telescopic condition, has not only improved the fault rate of motor, and has seriously influenced the life of motor, and user's use experience is relatively poor.

Therefore, how to provide a motor with magnetic steel not easy to separate from a sleeve is a technical problem which needs to be solved urgently at present.

SUMMERY OF THE UTILITY MODEL

A first object of the present application is to provide a motor, in which a magnetic steel is stably fixed to a sleeve, and the probability of the magnetic steel being separated from the sleeve is low.

To achieve the purpose, the following technical scheme is adopted in the application:

a motor, comprising: a motor shaft; a stator; the rotor comprises a sleeve and a plurality of magnets, the magnets are uniformly distributed along the inner surface of the sleeve and fixedly connected to the sleeve, the magnets extend along the axial direction of the sleeve, and the sleeve is provided with a first end and a second end which are oppositely arranged in the axial direction of the sleeve; the motor further includes: a first retaining member disposed at the first end of the sleeve, the first retaining member including a plurality of first raised portions disposed at intervals, the plurality of first raised portions engaging the plurality of magnets to limit the magnets from moving away from the second end in an axial direction of the sleeve; a second fixed member disposed at the second end of the sleeve, the second fixed member including a plurality of second protrusions disposed at intervals, the plurality of second protrusions engaging with the plurality of magnets to restrict the magnets from moving away from the first end in an axial direction of the sleeve; the first fixing piece further comprises a ring plate, at least part of the first protruding portion is arranged on the ring plate in a protruding mode, and the height of at least part of the first protruding portion is at least larger than half of the thickness of the ring plate.

In some embodiments, the height of the first boss is 1 to 5 times the thickness of the ring plate.

In some embodiments, a plug groove is formed between two adjacent magnets; the first bulge is inserted into the inserting groove from a first opening of the inserting groove, and the side wall surface of the first bulge is attached to the side wall surface of the magnet on the corresponding side; the second bulge is inserted into the inserting groove from the second opening of the inserting groove, and the side wall surface of the second bulge is attached to the side wall surface of the magnet on the corresponding side.

In some embodiments, the magnet has an adhesive surface adhered to an inner surface of the sleeve; the shape of the cross section of the magnet in the direction perpendicular to the axial direction of the sleeve is a polygon.

In some embodiments, the ring plate is disposed within the sleeve, and an outer annular surface of the ring plate abuts an inner wall surface of the sleeve.

In some embodiments, an annular receiving groove is circumferentially formed in the sleeve, and the annular plate is embedded in the annular receiving groove.

In some embodiments, the first fixing member further comprises a first annular frame, at least a portion of the first protrusion is protruded from the first annular frame, and the first annular frame is sleeved on the first end of the sleeve; and/or the second fixing piece further comprises a second annular frame, at least part of the second bulge is arranged on the second annular frame in a protruding mode, and the second annular frame is sleeved on the second end of the sleeve.

In some embodiments, the second fixing member further includes a plurality of limiting portions, the limiting portions are disposed on an inner wall surface of the second annular frame, and the plurality of limiting portions are configured to limit the radial movement of the magnet along the sleeve.

In some embodiments, the side wall surface of the second boss is provided with a flange for limiting the radial movement of the magnet along the sleeve.

In some embodiments, the first protrusion includes a U-shaped limiting member for limiting the magnet to move along the circumferential direction of the sleeve, and the limiting member includes two oppositely disposed side plates elastically abutting against the corresponding side of the magnet.

In some embodiments, the first fixing member further includes a plurality of pressing portions, one pressing portion is disposed between two adjacent first protruding portions, and the pressing portion abuts against an end surface of the magnet.

A second object of the present application is to provide an electric tool having a low motor failure rate and a long service life.

To achieve the purpose, the following technical scheme is adopted in the application:

an electric tool comprises the motor.

The beneficial effect of this application:

the utility model provides a motor includes the motor shaft, a stator, a rotor, first mounting and second mounting, the rotor includes sleeve and magnet, a plurality of magnets are along telescopic internal surface evenly distributed and bond on the sleeve, the magnet sets up along telescopic axial extension, the sleeve has relative first end and the second end that sets up in its axial, first mounting sets up the first end at the sleeve, and first mounting includes the first bellying of a plurality of intervals settings, a plurality of first bellyings mesh with a plurality of magnets mutually, keep away from the second end along telescopic axial with the restriction magnet, the second mounting sets up the second end at the sleeve, the second mounting includes the second bellying of a plurality of intervals settings, a plurality of second bellyings mesh with a plurality of magnets mutually, keep away from first end along telescopic axial with the restriction magnet. This motor restricts the removal of magnet in sleeve axial and radial direction through setting up first mounting and second mounting, has improved the fixed effect of magnet on the sleeve, has reduced the unexpected probability that breaks away from the sleeve of magnet to reduce the fault rate of motor, improved the life of motor.

Drawings

Fig. 1 is a perspective view of a motor provided in an embodiment of the present application;

fig. 2 is a schematic structural diagram of a motor with a motor casing removed according to an embodiment of the present application;

FIG. 3 isbase:Sub>A cross-sectional view taken along line A-A of FIG. 2;

FIG. 4 is an exploded view of the structure shown in FIG. 2;

FIG. 5 is a perspective view of a second mount of a motor according to one embodiment of the present application;

FIG. 6 is a front view of a first mount of a motor provided in an embodiment of the present application;

FIG. 7 is a schematic diagram of a cross-sectional shape of a magnet of a motor provided by an embodiment of the present application in a direction perpendicular to an axial direction of a sleeve;

FIG. 8 is an exploded view of a motor provided in accordance with an embodiment of the present application;

FIG. 9 is a perspective view of a first mount of a motor according to an embodiment of the present application;

FIG. 10 is an exploded view of a motor provided in accordance with an embodiment of the present application;

fig. 11 is a schematic structural diagram of a sleeve of a motor according to an embodiment of the present application.

In the figure:

10. a motor:

100. a rotor; 200. a motor shaft;

110. a sleeve; 111. a limiting groove;

120. a magnet; 121. inserting grooves;

130. a first fixing member; 131. a first boss; 1311. a side plate; 1312. a connecting plate; 132. a ring plate; 133. a pressing part;

140. a second fixing member; 141. a second boss portion; 142. a limiting part;

150. a fixing ring;

160. a fan.

Detailed Description

The technical solutions of the present application will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

The present application provides a motor 10 that can be used in a power tool 10 to function as a power device for the power tool. Power tools include, but are not limited to, electric circular saws, lawn mowers, electric drills, and the like.

As shown in fig. 1 to 4, the motor 10 includes a motor housing, a motor shaft 200, a stator, a rotor 100, a first fixing member 130, and a second fixing member 140. The motor housing is formed with an installation space, the stator and the rotor 100 are installed in the installation space formed by the motor housing, the motor shaft 200 is located in the installation space, and the output end of the motor shaft 200 is protruded from the installation space. The stator is a fixed part fixed inside the motor shell and mainly used for generating a rotating magnetic field. The rotor 100 is capable of rotating, and the main function of the rotor 100 is to be cut by magnetic lines of force in a rotating magnetic field to generate electric current. Specifically, the rotor 100 includes a sleeve 110 and a plurality of magnets 120, the plurality of magnets 120 are uniformly distributed along an inner surface of the sleeve 110 and fixedly connected to the sleeve 110, the sleeve 110 and the magnets 120 are fixed in an adhesive or other connection manner, each magnet 120 extends along an axial direction of the sleeve 110, and the sleeve 110 has a first end and a second end opposite to each other in the axial direction thereof.

The first and second fixtures 130 and 140 serve to restrain the plurality of magnets 120 from both ends of the sleeve 110 in the axial direction.

Specifically, the first fixing member 130 is disposed at a first end of the sleeve 110, the first fixing member 130 includes a plurality of first protrusions 131 disposed at intervals, and the plurality of first protrusions 131 are engaged with the plurality of magnets 120 to restrict the magnets 120 from moving away from a second end in an axial direction of the sleeve 110. The second fixing member 140 is disposed at a second end of the sleeve 110, and the second fixing member 140 includes a plurality of second protrusions 141 disposed at intervals, and the plurality of second protrusions 141 are engaged with the plurality of magnets 120 to restrict the magnets 120 from moving away from the first end in an axial direction of the sleeve 110.

The motor 10 plays a role of restricting the movement of the magnet 120 in the axial direction of the sleeve 110 by providing the first fixing member 130 and the second fixing member 140 on both sides of the magnet 120, and plays a role of restricting the movement of the magnet 120 in the circumferential direction of the sleeve 110 by providing the first protrusion 131 on the first fixing member 130 and the second protrusion 141 on the second fixing member 140 and inserting the first protrusion 131 and the second protrusion 141 between the adjacent magnets 120. The motor 10 improves the fixing effect of the magnet 120 on the sleeve 110 by arranging the first fixing member 130 and the second fixing member 140, and reduces the probability that the magnet 120 is accidentally separated from the sleeve 110 under the working condition of high temperature or high vibration, thereby reducing the failure rate of the motor 10 and prolonging the service life of the motor 10.

It should be noted that the above "engagement" specifically means: since the plurality of magnets 120 are uniformly distributed on the inner wall surface of the sleeve 110 along the circumferential direction of the sleeve 110, a gap between two adjacent magnets 120 can form a plug-in groove 121, and a first opening and a second opening are respectively formed at two ends of the plug-in groove 121, the first opening is close to the first end of the sleeve 110, and the second opening is close to the second end of the sleeve 110. And because a plurality of magnets 120 are arranged in a circular array, a plurality of insertion grooves 121 arranged in a circular array can be formed. The plurality of first protrusions 131 are disposed in one-to-one correspondence with the plurality of insertion grooves 121, the first protrusions 131 are inserted into the insertion grooves 121 from the first openings of the corresponding insertion grooves 121, and the mutual fit between the plurality of first protrusions 131 and the plurality of insertion grooves 121 is similar to the gear teeth engagement of two gears, so it is called "engagement". Correspondingly, the plurality of second protrusions 141 are also disposed in one-to-one correspondence with the plurality of insertion grooves 121, the second protrusions 141 are inserted into the insertion grooves 121 from the second openings of the corresponding insertion grooves 121, and the mutual matching between the plurality of second protrusions 141 and the plurality of insertion grooves 121 is similar to the gear teeth meshing of two gears.

In some embodiments, the sidewall surface of the first protrusion 131 is attached to the sidewall surface of the corresponding side of the magnet 120, and the sidewall surface of the second protrusion 141 is attached to the sidewall surface of the corresponding side of the magnet 120. This arrangement can improve the engagement stability of the first fixing member 130 with the plurality of magnets 120 and improve the engagement stability of the second fixing member 140 with the plurality of magnets 120.

As shown in fig. 7, the shape of the cross section of the magnet 120 in the direction perpendicular to the axial direction of the sleeve 110 is a polygon. In some specific embodiments, the magnet 120 has a cubic shape, i.e., the magnet 120 has a rectangular shape (as shown by d in fig. 7) in a cross section perpendicular to the axial direction of the sleeve 110. The magnet 120 specifically includes four side wall surfaces, one of which is disposed opposite to the inner wall surface of the sleeve 110, and the side wall surface is an adhesive surface, and the magnet 120 can be adhered to the inner wall surface of the sleeve 110 by coating glue on the adhesive surface. Two of the four sidewall surfaces adjacent to the bonding surface are provided perpendicular to the bonding surface, and correspondingly, the sidewall surface of the first projecting portion 131 and the sidewall surface of the second projecting portion 141, which are respectively bonded to the two opposing sidewall surfaces of the magnet 120, are also provided perpendicular to the bonding surface.

In some embodiments, the magnet 120 is frustum-shaped, i.e., the magnet 120 has a trapezoidal cross-section in a direction perpendicular to the axial direction of the sleeve 110 (as shown by a in fig. 7). The magnet 120 specifically includes four side wall surfaces, one of which is disposed opposite to the inner wall surface of the sleeve 110, and the side wall surface is an adhesive surface, and the magnet 120 can be adhered to the inner wall surface of the sleeve 110 by coating glue on the adhesive surface. Two of the four sidewall surfaces adjacent to the bonding surface are disposed at acute angles to the bonding surface, and correspondingly, the sidewall surfaces of the first protruding portion 131 and the second protruding portion 141 respectively attached to the two opposing sidewall surfaces of the magnet 120 are also disposed at acute angles to the bonding surface.

In other embodiments, the magnet 120 has a hexagonal prism shape, i.e. the shape of the cross-section of the magnet 120 in the direction perpendicular to the axial direction of the sleeve 110 is hexagonal (as shown in b in fig. 7). The magnet 120 specifically includes six side wall surfaces, one of which is disposed opposite to the inner wall surface of the sleeve 110, and the side wall surface is an adhesive surface, and the magnet 120 can be adhered to the inner wall surface of the sleeve 110 by coating glue on the adhesive surface. Besides the side wall surfaces arranged opposite to the bonding surface, the magnet 120 further comprises four side wall surfaces, the four side wall surfaces are used for being attached to the first protruding portion 131 and the second protruding portion 141, the four side wall surfaces are in a set, the two side wall surfaces are located on two sides of the bonding surface respectively and are symmetrically arranged, two side wall surfaces included by each side wall surface are connected in an obtuse angle mode, and one side wall surface is perpendicular to the bonding surface. Correspondingly, the side wall surface of the first protrusion 131 and the side wall surface of the second protrusion 141, which are attached to a set of side wall surfaces of the magnet 120, include a first side surface and a second side surface which are connected at an obtuse angle, and the first side surface is perpendicular to the bonding surface. Of course in other embodiments the magnet 120 is octagonal prism shaped, i.e. the shape of the cross section of the magnet 120 in the direction perpendicular to the axial direction of the sleeve 110 is octagonal (as shown in c in fig. 7).

In some embodiments, the first fixing member 130 further includes a first ring structure for connecting the plurality of first protrusions 131 everywhere. It should be noted that the first ring-shaped structure may be integrally formed with the plurality of first protrusions 131, or may be a separate component from the plurality of first protrusions 131, and connected together by assembling.

In some embodiments, as shown in fig. 4, the first annular structure is a ring plate 132, at least a portion of the first protrusion 131 is protruded from the ring plate 132, and specifically, a top end of the first protrusion 131 is fixedly connected to or integrally formed with a lower annular surface of the ring plate 132. The ring plate 132 is disposed in the sleeve 110, and an outer annular surface of the ring plate 132 is attached to an inner wall surface of the sleeve 110. In some embodiments, in order to improve the assembling stability of the first fixing element 130 and the sleeve 110, an annular receiving groove (not shown) is circumferentially formed in the sleeve 110, and the annular plate 132 is embedded in the annular receiving groove.

In some more specific embodiments, as shown in fig. 6, the height of the first protrusions 131 is H1, the thickness of the ring plate 132 is H2, and the height of at least a portion of the first protrusions 131 is at least greater than half the thickness of the ring plate 132, i.e., H1>1/2 × H2. If the height H1 of the first projecting portion 131 is too small, the gaps between the plurality of first projecting portions 131 are difficult to engage with the magnet 120, and if the height H1 of the first projecting portion 131 is too large, it is difficult to secure the structural strength of the first projecting portion 131. A better balance effect can be obtained by setting the height H1 of the first protruding portion 131 to be at least greater than half the thickness H2 of the ring plate 132.

In some embodiments, the height H1 of the first boss 131 may be 1 to 5 times the thickness H2 of the ring plate 132. In one embodiment, the height H1 of the first protrusion 131 may be 1.5 to 4 times the thickness H2 of the ring plate 132. Specifically, H1 may be 2 times to 3 times that of H2.

In other embodiments, the first annular structure may be a first annular frame, and the plurality of first protrusions 131 are all protruded on the first annular frame, specifically, the top ends of the first protrusions 131 are fixedly connected with the lower annular surface of the first annular frame or are integrally formed. The first annular shelf is disposed over the first end of the sleeve 110. Specifically, a first clamping ring groove is formed in the lower ring surface of the first ring frame, the first end of the sleeve 110 is clamped in the first clamping ring groove, and the first protruding portions 131 are arranged on the inner side of the first clamping ring groove. Compare in the ring board 132, the structure of first annular frame is more complicated, and is provided with a plurality of strengthening ribs, wholly is discoid. In some more specific embodiments, the first fixing member 130 provided with the first annular frame has the same or similar structure as the second fixing member 140 shown in fig. 4.

In some embodiments, the second fixing member 140 further includes a second annular structure for connecting the plurality of second protrusions 141 all together, and it should be noted that the second annular structure may be integrally formed with the plurality of second protrusions 141, or may be a separate component from the plurality of second protrusions 141 and connected all together by assembling.

In some embodiments, as shown in fig. 4, the second annular structure is a second annular frame, at least a portion of the second protruding portion 141 protrudes from the second annular frame, and specifically, a bottom end of the second protruding portion 141 is fixedly connected to or integrally formed with an upper annular surface of the second annular frame. A second annular frame is disposed over the second end of the sleeve 110. Specifically, a second clamping ring groove is formed in the upper ring surface of the second ring frame, the second end of the sleeve 110 is clamped in the second clamping ring groove, and the plurality of second protrusions 141 are arranged on the inner side of the second clamping ring groove.

In other embodiments, the second annular structure may also be an annular member disposed inside the sleeve 110. It should be noted that the second annular frame is integrally disc-shaped, a plurality of radial reinforcing ribs are also arranged on the second annular frame, and a support structure allowing the motor shaft 200 to pass through is further formed on the second annular frame, and the support structure can be used for fixing a bearing.

In some embodiments, as shown in fig. 5, the second fixing member 140 further includes a plurality of limiting portions 142, the limiting portions 142 are disposed on an inner wall surface of the second annular frame, and the plurality of limiting portions 142 are used for limiting the movement of the magnet 120 in the radial direction of the sleeve 110. The limiting portions 142 are disposed on an inner wall surface of the second annular frame facing the motor shaft 200, and two limiting portions 142 are disposed around each of the second protruding portions 141. After the second protrusion 141 is inserted into the gap between the two magnets 120, the stopper 142 can abut against the magnets 120 to limit the movement of the magnets 120 in the radial direction of the sleeve 110.

In some embodiments, the sidewall surface of the second protrusion 141 is provided with a flange for limiting the second end of the magnet 120 from moving in the radial direction of the sleeve 110. Specifically, the flange is adapted to abut against a side wall surface of the magnet 120 near the center of the sleeve 110, thereby restricting movement of the magnet 120 in the radial direction of the sleeve 110. Of course, a convex edge may be provided on the side wall surface of the first protrusion 131 to limit the first end of the magnet 120 from moving in the radial direction of the sleeve 110.

The first and second fixing members 130 and 140 described above are non-elastic members, i.e., the first and second fixing members 130 and 140 are not elastically deformed during the assembly process with the sleeve 110. In some embodiments, at least a portion of the first fixing element 130 and the second fixing element 140 may be elastic elements, so that the first fixing element 130 and the second fixing element 140 can be elastically deformed during the process of assembling with the sleeve 110, so as to reduce the difficulty of assembling the first fixing element 130 with the sleeve 110 and reduce the difficulty of assembling the second fixing element 140 with the sleeve 110.

In some embodiments, as shown in fig. 8 and 9, the first protruding portion 131 of the first fixing member 130 is an elastic structure, and specifically, the first protruding portion 131 includes a U-shaped limiting member for limiting the magnet 120 to move along the circumferential direction of the sleeve 110, the limiting member includes two oppositely disposed side plates 1311, and the side plates 1311 are elastically abutted to the corresponding side of the magnet 120.

In some embodiments, with continued reference to fig. 9, the first fixing element 130 further includes a ring plate 132, and each of the position-limiting elements is connected to the lower ring surface of the ring plate 132 through a connecting plate 1312, specifically, one end of the connecting plate 1312 is connected to the lower ring surface of the ring plate 132, and the other end is connected to the middle plate of the position-limiting element, and the middle plate of the position-limiting element is connected between the two side plates 1311.

In some embodiments, the first fixing element 130 further includes a plurality of pressing portions 133, one pressing portion 133 is disposed between two adjacent first protruding portions 131, and the pressing portions 133 can abut against the end surface of the magnet 120. In some embodiments, the pressing part 133 may be provided as a straight plate or an L-shaped plate as required.

It should be noted that the first fixing member 130 shown in fig. 9 may be a sheet metal part with an integral structure, which is manufactured through a cutting process and a bending process, or may be a splicing member formed by assembling a plurality of independent components. The structure of the second fixing element 140 may be the same as that of the first fixing element 130, that is, the second fixing element 140 is also provided with a limiting element, a ring plate 132 and a pressing part 133. The first fixing element 130 and the second fixing element 140 may also be plastic parts, and the molding process may be injection molding or the like.

In addition to the above structure of the first fixing element 130, as shown in fig. 10 and 11, the first fixing element 130 may also be a fixing ring 150, the fixing ring 150 is a circular ring structure, an inner wall surface of the sleeve 110 is provided with an annular limiting groove 111, a part of the structure of the fixing ring 150 is clamped in the limiting groove 111, and a lower ring surface of a part of the fixing ring 150 protruding out of the limiting groove 111 is pressed against top surfaces of the plurality of magnets 120, so as to limit the magnets 120 from being far away from the second end of the sleeve 110.

In some embodiments, and with continued reference to fig. 9, the motor 10 further includes a fan 160, the fan 160 being coupled to the motor shaft 200 such that the fan 160 can rotate synchronously with the motor shaft 200 to dissipate heat from the motor 10.

The application also discloses an electric tool, and the electric tool comprises the motor of any one of the above embodiments, and the motor can effectively reduce the failure rate of the electric tool and improve the use experience of a user.

It should be understood that the above-mentioned examples are only examples for clearly illustrating the present application, and are not intended to limit the embodiments of the present application. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims (12)

1. A motor, comprising:

a motor shaft (200);

a stator;

the rotor (100), the rotor (100) includes a sleeve (110) and a plurality of magnets (120), the plurality of magnets (120) are evenly distributed along the inner surface of the sleeve (110) and fixedly connected to the sleeve (110), the magnets (120) are arranged along the axial extension of the sleeve (110), and the sleeve (110) has a first end and a second end which are oppositely arranged in the axial direction;

characterized in that the motor further comprises:

a first fixing member (130) disposed at the first end of the sleeve (110), the first fixing member (130) including a plurality of first protrusions (131) disposed at intervals, the plurality of first protrusions (131) engaging with the plurality of magnets (120) to restrict the magnets (120) from moving away from the second end in an axial direction of the sleeve (110);

a second retaining member (140) disposed at the second end of the sleeve (110), the second retaining member (140) including a plurality of second spaced apart raised portions (141), the plurality of second raised portions (141) engaging the plurality of magnets (120) to limit axial movement of the magnets (120) away from the first end along the sleeve (110);

the first fixing piece (130) further comprises a ring plate (132), at least part of the first protrusions (131) are arranged on the ring plate (132) in a protruding mode, and the height of at least part of the first protrusions (131) is at least larger than half of the thickness of the ring plate (132).

2. The motor according to claim 1, characterized in that the height of the first boss (131) is 1 to 5 times the thickness of the ring plate (132).

3. The motor of claim 1,

an insertion groove (121) is formed between two adjacent magnets (120);

the first protruding part (131) is inserted into the insertion groove (121) from a first opening of the insertion groove (121), and a side wall surface of the first protruding part (131) is attached to a side wall surface of the corresponding magnet (120);

the second protruding part (141) is inserted into the insertion groove (121) from a second opening of the insertion groove (121), and the side wall surface of the second protruding part (141) is attached to the side wall surface of the corresponding magnet (120).

4. The motor of claim 3,

the magnet (120) has an adhesive surface adhered to the inner surface of the sleeve (110);

the magnet (120) has a polygonal shape in a cross section perpendicular to the axial direction of the sleeve (110).

5. The motor of claim 1, wherein the ring plate (132) is disposed within the sleeve (110) and an outer annular surface of the ring plate (132) abuts an inner wall surface of the sleeve (110).

6. The motor of claim 5, wherein the sleeve (110) has an annular receiving groove disposed circumferentially therein, the ring plate (132) being nested in the annular receiving groove.

7. The motor of claim 1,

the first fixing piece (130) further comprises a first annular frame, at least part of the first bulge (131) is arranged on the first annular frame in a protruding mode, and the first annular frame is sleeved on the first end of the sleeve (110);

and/or the second fixing piece (140) further comprises a second annular frame, at least part of the second bulge (141) is arranged on the second annular frame in a protruding mode, and the second annular frame is sleeved on the second end of the sleeve (110).

8. The motor according to claim 7, wherein the second fixing member (140) further comprises a plurality of limiting portions (142), the limiting portions (142) being provided on an inner wall surface of the second annular frame, the plurality of limiting portions (142) being configured to limit the radial movement of the magnet (120) along the sleeve (110).

9. The motor according to claim 1, wherein the side wall surface of the second boss (141) is provided with a flange for restricting the magnet (120) from moving in the radial direction of the sleeve (110).

10. The motor according to claim 1, wherein the first boss (131) comprises a U-shaped stopper for restricting the circumferential movement and radial movement of the magnet (120) along the sleeve (110), the stopper comprising two oppositely disposed side plates (1311), the side plates (1311) being in elastic abutment with the magnet (120) on the corresponding side.

11. The motor according to claim 9, wherein the first fixing member (130) further comprises a plurality of pressing portions (133), one pressing portion (133) is arranged between two adjacent first protruding portions (131), and the pressing portions (133) are abutted against the end face of the magnet (120).

12. A power tool comprising a motor according to any one of claims 1 to 11.

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