CN214314796U

CN214314796U - Motor and electric tool

Info

Publication number: CN214314796U
Application number: CN202120353725.4U
Authority: CN
Inventors: 孟超; 张洋
Original assignee: Nanjing Chervon Industry Co Ltd
Current assignee: Nanjing Chervon Industry Co Ltd
Priority date: 2020-06-04
Filing date: 2021-02-08
Publication date: 2021-09-28
Anticipated expiration: 2031-02-08
Also published as: CN113765262A

Abstract

The utility model discloses a motor and electric tool belongs to electric tool technical field, and this motor includes: the stator assembly comprises a stator core and a winding wound on the stator core, wherein the winding comprises an access end connected into the stator core and an access end connected out of the stator core; the rotor assembly is rotationally arranged on the inner periphery of the stator assembly and comprises a rotor shaft extending along a first linear direction; the terminal assembly is used for connecting or fixing the access end and the output end; a first end plate for fixing the windings and at least partially embedded in the stator assembly, the terminal assembly being disposed circumferentially of the first end plate around the first straight line; the motor shell is arranged on the periphery of the stator component; the first end plate is provided with a limiting bulge for fixing the motor shell along the direction of the rotor shaft. The motor realizes the fixation of the motor shell along the direction of the rotor shaft, and avoids the relative motion between the motor and the motor shell along the direction of the rotor shaft in the working process, thereby improving the working stability of the motor.

Description

Motor and electric tool

Technical Field

The utility model relates to the technical field of motors, especially, relate to a motor and electric tool.

Background

The motor is widely applied to various electric tools as a power source. Generally, an electric machine drives a transmission assembly or an output assembly by outputting a torque. The motors can be divided into an inner rotor motor and an outer rotor motor according to different relative positions between the stator and the rotor. The rotor assembly of the inner rotor motor is positioned at the inner side, and the stator assembly is positioned at the outer side; the rotor assembly of the outer rotor motor is positioned on the outer side, and the stator assembly is positioned on the inner side.

The inner rotor motor and the motor shell are easy to move relatively along the direction of the rotor shaft in the working process, so that the working stability of the motor is influenced.

Therefore, it is desirable to provide a motor and an electric tool to solve the above technical problems in the prior art.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a motor and electric tool, its job stabilization nature is high.

In order to realize the purpose, the utility model adopts the following technical scheme:

an electric machine comprising:

the stator assembly comprises a stator core and a winding wound on the stator core, wherein the winding comprises an access end accessed into the stator core and an access end accessed out of the stator core;

the rotor assembly is rotatably arranged on the inner periphery of the stator assembly and comprises a rotor shaft extending along a first linear direction;

the terminal assembly is used for connecting or fixing the access end and the access end;

a first end plate for fixing the windings and at least partially embedded in the stator assembly, the terminal assembly being disposed circumferentially of the first end plate about the first line;

the motor shell is arranged on the periphery of the stator assembly;

and the first end plate is provided with a limiting bulge for fixing the motor shell along the direction of the rotor shaft.

As a preferable embodiment of the motor, the motor further includes:

a limiting member;

follow on the spacing bellied periphery wall first straight line direction is provided with first spacing groove, follow on stator module's the periphery wall first straight line direction be provided with the second spacing groove of first spacing groove intercommunication, follow on the internal perisporium of motor housing first straight line direction is provided with the third spacing groove, first spacing groove with the second spacing groove with the third spacing groove just forms spacing chamber to the lock, the locating part at least part connect in spacing chamber.

As a preferred technical solution of the above motor, the first limiting groove, the second limiting groove, and the third limiting groove are all arc-shaped grooves.

As a preferred technical solution of the above motor, the widths of the notches of the first limiting groove, the second limiting groove and the third limiting groove are all equal.

As a preferred technical solution of the above motor, the limiting member is in interference connection with an inner wall of the limiting cavity.

As a preferable technical solution of the above motor, the limiting member is a cylindrical pin, and a diameter of the cylindrical pin is larger than an inner diameter of the limiting cavity.

As a preferred technical solution of the above motor, the limiting member is a screw, and an internal thread is provided on a part of an inner wall of the limiting cavity.

As a preferred technical solution of the above motor, a positioning boss is provided on the motor casing, and an end face of the limiting protrusion abuts against an end face of the positioning boss along the first linear direction.

As a preferred technical scheme of the motor, two limiting protrusions are symmetrically arranged on the first end plate.

In order to achieve the purpose, the utility model also provides an electric tool, including above-mentioned arbitrary technical scheme the motor.

Compared with the prior art, the beneficial effects of the utility model reside in that:

the utility model provides a motor through set up spacing arch on first end plate, realizes along the fixed motor casing of the direction of rotor shaft, avoids the motor to take place relative motion along the direction of rotor shaft between working process and motor casing to improve the job stabilization nature of motor.

Drawings

Fig. 1 is a perspective view of a motor in a first embodiment of the present invention, without showing a motor casing;

fig. 2 is a perspective view of the motor of fig. 1 of the present invention, which is wound around the input end and the output end;

figure 3 is an exploded view of the motor of figure 1 in accordance with the present invention;

fig. 4 is an exploded view of a terminal assembly and a stator core of the motor of fig. 1 according to the present invention;

figure 5 is an exploded view of the stator core of the motor of figure 4 in accordance with the present invention;

figure 6 is a left side view of a terminal assembly of the motor of figure 4 in accordance with the present invention;

figure 7 is an exploded schematic view of a terminal assembly of the motor of figure 4 in accordance with the present invention;

figure 8 is an exploded view of another perspective of a terminal assembly of the motor of figure 7 in accordance with the present invention;

figure 9 is a schematic perspective view of a first end plate of the motor of figure 3 in accordance with the present invention;

fig. 10 is an enlarged view of a portion of fig. 2 according to the present invention;

fig. 11 is a perspective view of an electric circular saw according to a first embodiment of the present invention;

fig. 12 is a perspective view of a reciprocating saw according to a first embodiment of the present invention;

fig. 13 is a perspective view of a motor according to a second embodiment of the present invention;

figure 14 is a perspective view of the motor of figure 13 without the motor housing;

figure 15 is an exploded view of the motor of figure 13 in accordance with the present invention;

figure 16 is a cross-sectional schematic view of the motor of figure 13 in accordance with the present invention;

figure 17 is an exploded view of a portion of the motor of figure 14 in accordance with the present invention;

figure 18 is an exploded view of the motor of figure 14 in accordance with the present invention;

fig. 19 is a schematic perspective view of the connection terminal of fig. 18 according to the present invention;

fig. 20 is a perspective view of a motor in a third embodiment of the present invention, without showing a motor casing.

In the figure:

100. a motor; 101. a first straight line; 110. an electric circular saw; 120. a reciprocating saw;

11. a stator assembly; 12. a rotor assembly; 13. a first end plate; 14. a second end plate; 15. a fan; 16. a terminal assembly;

111. a stator core; 111a, a connecting arm; 111b, an access slot; 111c, a first type of punching sheet; 111d, a special-shaped part; 111e, second class punching sheet; 112. a winding; 112a, an access end; 112b, a connection and output end; 121. a rotor shaft; 131. a first fixed end; 132. a first limiting part; 133. a second limiting part; 134. a limiting groove; 141. a second fixed end; 161. an insert; 162. a wire hooking frame; 162a, a thread hooking part; 162b, a connecting portion; 162c, a limiting bulge;

200. a motor; 201. a motor housing; 202. a first straight line;

21. a first end plate; 22. a stator assembly; 23. a rotor assembly; 24. a terminal assembly; 25. a circuit board; 26. a power line; 27. a limiting member;

201a, a third limit groove; 201b, positioning a boss; 211. a first protrusion; 212. a wire slot; 213. mounting grooves; 214. a limiting bulge; 214a, a first limit groove; 221. a second limit groove; 222. a winding; 231. a rotor shaft; 241. a connection terminal; 241a, a connecting part; 241b, a thread hooking part; 241c, a wiring portion; 251. a through hole;

300. a motor;

31. a circuit board; 32. a rotor shaft;

311. a profiled hole; 311a, a through hole; 311b, round segment; 312. an integration part.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description of the present invention and simplification of description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; either mechanically or electrically. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

Example one

The present embodiment provides an electric machine, as shown in fig. 1 to 3, the electric machine 100 includes a stator assembly 11, a rotor assembly 12, a first end plate 13, and a second end plate 14. Wherein the rotor assembly 12 is rotatably disposed at an inner circumference of the stator assembly 11. In some alternative embodiments, the rotor assembly 12 may also be disposed outside of the stator assembly 11 and secured by a first end plate 13 and a second end plate 14. Specifically, the rotor assembly 12 includes a rotor shaft 121, and the rotor shaft 121 extends along the first straight line 101 (i.e., axially). As an implementation manner, a fan 15 is further disposed on the rotor shaft 121, and the fan 15 is used for dissipating heat to the motor 100. The stator assembly 11 includes a stator core 111 and windings 112. Wherein the winding 112 is wound around the stator core 111. When the windings 112 are energized, the rotor of the motor 100 begins to rotate. The stator core 111 is provided with connecting arms 111a around which the windings 112 can be wound, a gap is provided between adjacent connecting arms 111a, and the windings 112 are wound around the connecting arms 111a and at least partially positioned in the gap. The winding 112 includes an incoming end 112a wound to the connection arm 111a and an outgoing end 112b wound from the connection arm 111 a. In one implementation, the motor 100 is provided with a terminal assembly 16 that fixes the inlet 112a and the outlet 112 b.

As shown in fig. 4 to 5, the stator core 111 is provided with an access slot 111b for accessing the terminal assembly 16. Specifically, the stator core 111 is formed of a plurality of punched pieces. As an implementation manner, the punching sheet includes a first punching sheet 111c and a second punching sheet 111 e. The first punching sheet 111c and the second punching sheet 111e are connected into a whole through self rivets. Wherein, the first punching sheet 111c is provided with a connecting arm 111a and an abnormal-shaped part 111 d; the second punching sheet 111e is formed with a connecting arm 111 a. The first punching sheets 111c are overlapped together along the first straight line 101, and the special-shaped portion 111d of the first punching sheets finally forms the access groove 111 b. The access groove 111b is formed with a bayonet which allows the terminal assembly 16 to be snapped in and can fix the terminal assembly 16. In order to effectively fix the terminal assembly 16 to the access groove 111b, the access groove 111b has a predetermined length L in the direction of the first line 101, where L is greater than or equal to 5mm and less than or equal to 40 mm. More specifically, L is 5mm or more and 20mm or less. When the terminal assembly 16 is coupled to the access slot 111b, an adhesive may be further provided on the access slot 111b, thereby further increasing the reliability of the access slot 111b in coupling the terminal assembly 16. In fact, the length of L defines the length or the number of the first punching sheets 111c along the first straight line 101, that is, the length of the first punching sheets 111c along the first straight line 101 is defined within a preset length range or a preset number range. It should be explained here that the length of the terminal assembly 16 in the direction of the first line 101 is set substantially within a preset range as long as the incoming end 112a and the outgoing end 112b of the winding 112 can be effectively wound. With this arrangement, the length of the terminal assembly 16 in the direction of the first line 101 determines the length or number of the first type stamped pieces 111c in the direction of the first line 101. Therefore, the length of the insertion slot 111b formed by the first punching piece 111c along the first straight line 101 may be equal to or greater than the length of the guide rail portion of the terminal assembly 16 along the first straight line 101.

In order to adjust the size of the motor 100, the number of the second punching sheets 111e may also be adjusted to adjust the length of the stator core 111 along the first straight line 101, so as to control the space occupied by the motor 100 along the first straight line 101. For the electric tool with larger power output, the number of the second punching sheets 111e can be increased, so that the size and the output power of the motor 100 can meet the requirement of high power. On such a premise, by disposing the incoming end 112a and the outgoing end 112b of the winding 112 on the incoming slot 111b, the space occupied by the motor 100 in the direction of the first straight line 101 can be effectively controlled, thereby enabling to control the size of the whole machine. For the electric tool with smaller output power and smaller occupied space, the size of the motor 100 along the direction of the first straight line 101 can also be controlled by adjusting the number of the second punching sheets 111e, and the size of the motor 100 along the direction of the first straight line 101 can be further reduced by arranging the incoming end 112a and the outgoing end 112b of the winding 112 on the incoming groove, so that the space occupied by the driving part of the electric tool is smaller, the size of the electric tool is reduced, and the operation experience of a user is optimized.

As shown in fig. 6 to 8, the terminal assembly 16 includes an insert 161 and a hook frame 162. The insert 161 includes a guide portion capable of being inserted into the bayonet and a slot into which the hook holder 162 is inserted. The insert 161 is made of an insulating material, and the insert 161 extends substantially in a straight direction parallel to the first straight line 101. The wire hooking frame 162 is specifically an arc segment deviating from the direction of the first straight line 101, and the wire hooking frame 162 can be further deviated from the stator core 111 by the design. The wire hooking frame 162 further includes a first end and a second end, wherein the first end is formed with a wire hooking portion 162a, and the wire hooking portion 162a is in a hook shape, and can easily hook the incoming end 112a and the outgoing end 112b of the winding 112 and fix the same on the wire hooking portion 162 a. The second end of the wire hooking frame 162 is formed with a connecting portion 162b, and the connecting portion 162b is used for connecting a power control wire, which can provide power for the winding 112. As one implementation, the connecting portion 162b is configured as a circular through hole, which can facilitate the welding of the power control line to the wire hooking frame 162. The wire hooking frame 162 is further provided with a limiting protrusion 162c connected to the caulking groove, and the limiting protrusion 162c can be embedded into the caulking groove, so that the positioning between the wire hooking frame 162 and the insert 161 is facilitated, and the embedding between the wire hooking frame 162 and the insert 161 is facilitated. The line hooking frames are provided with a plurality of lines, and in a plane along the extension direction of the insert, included angles among the line hooking frames are set to be acute angles.

As shown in fig. 1, 9 and 10, the first end plate 13 includes a first fixed end 131 fixed to the stator core 111 and a stopper portion around which the winding 112 can be wound. Wherein the first fixed end 131 is provided to be mountable to the gap of the connection arm 111a of the aforementioned stator core 111. The second end plate 14 includes a second fixing end 141 fixed to the stator core 111, and the second fixing end 141 can be disposed to be fitted into the gap of the connection arm 111a of the aforementioned stator core 111. The stopper portion of the first end plate 13 includes a first stopper portion 132 and a second stopper portion 133. The first position-limiting portion 132 is a protrusion perpendicular to the first straight line 101 or obliquely intersecting the first straight line 101, and can limit the winding 112 wound on the first end plate 13 from being separated from the first end plate 13 along the first straight line 101 or obliquely intersecting the first straight line 101. In fact, the main body portion of the first end plate 13 and the first position-limiting portion 132 together form a position-limiting groove 134, and the winding 112 can be wound into the position-limiting groove 134. Through such a design, both the input end 112a and the output end 112b of the winding 112 can be wound on the first end plate 13, so as to optimize the winding manner of the winding 112, avoid the winding 112 from being respectively provided with the input end 112a or the output end 112b on the first end plate 13 and the second end plate 14, and thus effectively reduce the size of the motor 100 along the direction of the first straight line 101. As a preferred embodiment, the first stopper 132 is disposed on the first end plate 13, so that the connection terminal 112a and the connection terminal 112b of the winding 112 are effectively integrated. The second limiting portion 133 of the first end plate 13 is configured as a protrusion substantially distributed along the first straight line 101, and the protrusion can be matched with the wire hooking frame 162 to realize separation of each line of the winding 112 in the routing process. The second stopper 133 is provided in plurality so that a plurality of channels can be formed to facilitate separation of the incoming end 112a and the outgoing end 112b of the winding 112.

As shown in fig. 1 and 10, the wire hooking bracket 162 is mounted to the insert 161, and the wire hooking bracket 162 and the insert 161 are integrally connected by inserting the limiting protrusion 162c provided on the wire hooking bracket 162 into the insertion groove of the insert 161, and at this time, the insert 161 and the wire hooking bracket 162 are provided as the terminal assembly 16, the terminal assembly 16 can be mounted into the insertion groove 111b of the stator core 111. In this process, the guide portions provided on the insert 161 can guide the entire terminal assembly 16 into the access slot 111b, thereby greatly facilitating the assembly and positioning of the terminal assembly 16. At this time, when the first end plate 13 and the second end plate 14 are fixed to the stator core 111, one end of the terminal assembly 16 away from the second punching sheet 111e is a preset distance H from the first end plate 13, and H is greater than 1mm and less than or equal to 5 mm. As a preferred implementation, H can be set to be greater than 1mm and equal to or less than 3 mm. It should be explained here that the preset distance H is for any position on the terminal assembly 16 away from the second type of punch 111 e. With such an arrangement, when the winding 112 is wound around the hook frame 162 through the passage formed by the second stopper 133, on the one hand, the incoming end 112a and the outgoing end 112b of the winding 112 can be separated from the stator core 111 when connected to the hook portion 162a of the hook frame 162, so that the winding has a good insulation effect. On the other hand, a space for the fixing member to access is provided between the winding 112 and the access end 112a and the access end 112b and the terminal assembly 16, so that the winding 112 can be disposed at a relatively fixed position, and the vibration generated by the rotation of the rotor during the high-speed operation of the motor 100 is prevented from causing the winding 112 to vibrate and causing the access end 112a or the access end 112b of the winding 112 to be damaged under the resonance effect.

The present embodiment also provides a power tool, which includes the motor 100, and the power tool may be an electric circular saw 110 as shown in fig. 11, a reciprocating saw 120 as shown in fig. 12, or other power tools with motors. The electric tool provided by the embodiment has the advantage of high working stability due to the adoption of the motor 100.

Example two

Fig. 13 and 14 show a motor 200 according to a second embodiment of the present invention. The motor 200 of the second embodiment is different from the motor 100 of the first embodiment in the arrangement and structure of the terminal assembly 24, and the same points as those of the first embodiment are applied to the present embodiment. The following specifically describes the technical solution in this embodiment.

As shown in fig. 13 to 19, in the present embodiment, the motor 200 includes a first end plate 21 and a second end plate (not shown), the first end plate 21 and the second end plate being used for insulation and for fixing the winding 222. Wherein the first end plate 21 comprises a first side and a second side (not shown), wherein the first side is adapted for winding the incoming and outgoing ends of the winding 222; the second side is used to enclose and secure the stator assembly 22 and the rotor assembly 23. Specifically, the first side surface is formed with a first protrusion 211 for fixing the first wire, and the winding 222 is fixed at the first protrusion 211 and starts to wind around the wire slot 212 on the first side surface, and further winds onto the connecting arm of the stator core, and the connecting arm winds out and passes through the terminal assembly 24 and winds into the next set of connecting arms after passing through the terminal assembly 24. In the present embodiment, the terminal assembly 24 can divide the wire slot 212 into multiple layers, and when the winding 222 is wound into the wire slot 212 and divided into different layers by the terminal assembly 24, the size of the winding 222 in the circumferential direction around the first straight line 202 can be effectively reduced, so as to avoid the winding 222 from protruding from the radial position of the first end plate 21, on one hand, the radial size of the motor 200 can be reduced, and on the other hand, the probability that the winding 222 is worn by the external action can be reduced.

As shown in fig. 15 to 18, the motor 200 further includes a motor housing 201, the motor housing 201 is mounted on the periphery of the stator assembly 22, and the first end plate 21 is provided with a limiting protrusion 214 for fixing the motor housing 201 along the direction of the rotor shaft 231, so as to prevent relative movement between the motor 200 and the motor housing 201 along the direction of the rotor shaft 231, thereby improving the working stability of the motor 200.

Further, the motor 200 further includes a limiting member 27, a first limiting groove 214a is formed in the outer peripheral wall of the limiting protrusion 214 along the direction of the first straight line 202, a second limiting groove 221 communicated with the first limiting groove 214a is formed in the outer peripheral wall of the stator assembly 22 along the direction of the first straight line 202, a third limiting groove 201a is formed in the inner peripheral wall of the motor casing 201 along the direction of the first straight line 202, the first limiting groove 214a, the second limiting groove 221 and the third limiting groove 201a are just fastened to form a limiting cavity, and at least part of the limiting member 27 is connected to the limiting cavity. By arranging the limiting member 27 in the limiting cavity, the effect of preventing relative movement between the motor case 201 and the motor 200 along the direction of the rotor shaft 231 is achieved, and the installation stability of the motor case 201 is improved.

Furthermore, two ends of the first limiting groove 214a are respectively communicated with two ends of the limiting protrusion 214 along the direction of the first straight line 202, and two ends of the second limiting groove 221 are respectively communicated with two ends of the outer peripheral wall of the stator assembly 22 along the direction of the first straight line 202.

Optionally, the first limiting groove 214a, the second limiting groove 221 and the third limiting groove 201a are all arc-shaped grooves, so that the processing is convenient, and no sharp corner can avoid stress concentration to cause limiting failure. Preferably, the widths of the notches of the first limiting groove 214a, the second limiting groove 221 and the third limiting groove 201a are all equal. Under this structure, spacing chamber is cylindrical cavity, is convenient for set up columniform locating part 27.

As an implementation manner, the limiting member 27 is in interference fit connection with the inner wall of the limiting cavity to realize the rotation prevention function. Alternatively, the position-limiting member 27 may be a cylindrical pin, and the diameter of the cylindrical pin is larger than the inner diameter of the position-limiting cavity, so as to realize interference connection with the inner wall of the position-limiting cavity.

As another implementation manner, the position limiting member 27 is a screw, and a part of the inner wall of the position limiting cavity is provided with an internal thread. For example, the internal thread may be disposed on the first limiting groove 214a and the third limiting groove 201a opposite thereto, and may also be disposed on the second limiting groove 221 and the third limiting groove 201a opposite thereto, and the specific disposition position of the internal thread is not limited in this embodiment.

The motor casing 201 of this embodiment is further provided with a positioning boss 201b, and the end surface of the limiting protrusion 214 along the first straight line 202 is abutted to the end surface of the positioning boss 201b, so as to realize axial limiting of the limiting boss.

Optionally, the number of the limiting protrusions 214 may be one or more, and preferably, a plurality of limiting protrusions 214 are provided to ensure the limiting effect, and the plurality of limiting protrusions 214 are uniformly distributed along the circumferential direction. The first end plate 21 in this embodiment is symmetrically provided with two limiting protrusions 214. Correspondingly, two third limiting grooves 201a are arranged on the motor casing 201. In order to facilitate the assembly of the first end plate 21 and the stator assembly 22, an even number of second limiting grooves 221 are formed in the outer peripheral wall of the stator assembly 22, so that when the first end plate 21 is installed, only the two limiting protrusions 214 and the two second limiting grooves 221 are required to be respectively corresponding. Optionally, six second limiting grooves 221 are provided in this embodiment.

In the present embodiment, the terminal assembly 24 includes a plurality of connection terminals 241, and the plurality of connection terminals 241 are distributed at circumferential positions of the first end plate 21 around the first straight line 202. The first end plate 21 is provided with a plurality of mounting grooves 213 for mounting the connection terminals 241. As shown in fig. 19, the connection terminal 241 includes a connection portion 241a, a hooking portion 241b, and a wire connection portion 241 c. Wherein the connection portion 241a is provided to be fitted to the mounting groove 213 and to fix the connection terminal 241 to the first end plate 21. A stopper protrusion is formed or connected to the connection portion 241a, which prevents the connection terminal 241 from being separated from the mounting groove 213. The wire hooking portion 241b is a hook-shaped structure and can divide the wire slot 212 on the first end plate 21, so as to divide the direction of the winding 222, separate the wire routing portion and the wire connection portion of the winding 222, and avoid the wire routing portion and the wire connection portion of the winding 222 from interfering with each other to affect the insulation effect. The connection portion 241c of the connection terminal 241 is also formed in a hook shape and extends from the body portion of the connection terminal 241 so that the control power supply control line connected to the connection portion 241c can be separated from the winding 222 or the stator core or the like. Meanwhile, the wire connection portion 241c is also provided within the circumferential range of the first end plate 21 formed around the first straight line 202. So that the radial size of the wire connecting portion 241c can be effectively controlled within a predetermined range after the power control line is connected. For some electric tools using two-piece housings, when the motor 200 with a smaller radial dimension is installed therein, the size of the motor housing 201 for installing the motor 200 can be effectively reduced, so that the electric tool is more compact as a whole and is more convenient for an operator to operate.

The motor 200 further includes a circuit board 25 for control, the circuit board 25 being disposed at one end of the motor 200. Specifically, the circuit board 25 is disposed at one end of the motor 200 for connecting the control power line 26. As one implementation, the circuit board 25 is formed with a through hole 251 through which the rotor shaft can pass, and is also formed with a connection hole connected to the first end plate 21. On a plane perpendicular to the direction of the first straight line 202, the projection of the circuit board 25 on the plane along the direction of the first straight line 202 is set to be triangular, so that on one hand, the circuit board 25 has higher structural strength, and the circuit board 25 is not damaged by vibration generated when the motor 200 rotates at high speed; on the other hand, with such an arrangement, after the circuit board 25 is connected to the first end plate 21, there are more connecting channels between the winding 222 and the outside, so that a better cooling of the winding 222 can be achieved.

The present embodiment also provides a power tool, which includes the motor 200, and the power tool may be the electric circular saw 110 shown in fig. 11, the reciprocating saw 120 shown in fig. 12, or other power tools with motors. The electric tool provided by the embodiment has the advantage of high working stability due to the adoption of the motor 200.

EXAMPLE III

Fig. 20 shows a motor 300 according to a third embodiment of the present invention. The motor 300 in the present embodiment is different from the motor 100 in the first embodiment in the arrangement and structure of the circuit board 31, and the same points as those in the first embodiment are applied to the present embodiment. The following specifically describes the technical solution in this embodiment.

In the present embodiment, the circuit board 31 is disposed at one end of the motor 300 and is detachably connected to the first end plate or the second end plate of the motor 300. As one implementation, the circuit board 31 is provided with a through hole 311a through which the rotor shaft 32 can pass and an integration portion 312 for circuit integration. The integrated portion 312 is provided on one side of the circuit board 31. In fact, the integration portion 312 is provided to allow all the electrical components to be mounted. The inner side of the circuit board 31 is provided with a profile hole 311. Specifically, the special-shaped hole 311 includes a through hole 311a through which the rotor shaft 32 passes and circular notches 311b distributed around the rotor shaft 32. The special-shaped hole 311 is hollowed out around the space of the rotor shaft 32, so that the rotor assembly is communicated with the outside to form a larger communication space, and heat dissipation of the rotor assembly is facilitated.

The present embodiment also provides a power tool, which includes the motor 300, and the power tool may be the electric circular saw 110 shown in fig. 11, the reciprocating saw 120 shown in fig. 12, or other power tools with motors. The electric tool provided by the embodiment has the advantage of high working stability due to the adoption of the motor 300.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. 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 invention should be included in the protection scope of the claims of the present invention.

Claims

1. An electric machine comprising:

the motor shell is arranged on the periphery of the stator assembly;

it is characterized in that the preparation method is characterized in that,

2. The electric machine of claim 1, further comprising:

a limiting member;

3. The electric machine of claim 2,

the first limiting groove, the second limiting groove and the third limiting groove are arc-shaped grooves.

4. The electric machine of claim 3,

the widths of the notches of the first limiting groove, the second limiting groove and the third limiting groove are equal.

5. The electric machine of claim 3,

the limiting part is in interference connection with the inner wall of the limiting cavity.

6. The electric machine of claim 5,

the limiting part is a cylindrical pin, and the diameter of the cylindrical pin is larger than the inner diameter of the limiting cavity.

7. The electric machine of claim 3,

the limiting part is a screw, and an internal thread is arranged on part of the inner wall of the limiting cavity.

8. The electric machine of claim 1,

the motor shell is provided with a positioning boss, and the end face of the limiting protrusion abuts against the end face of the positioning boss along the first straight line direction.

9. The electric machine of claim 1,

two limiting bulges are symmetrically arranged on the first end plate.

10. A power tool comprising the motor according to any one of claims 1 to 9.