CN209963842U - Split type brushless motor for electric circular saw - Google Patents
Split type brushless motor for electric circular saw Download PDFInfo
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- CN209963842U CN209963842U CN201921220620.0U CN201921220620U CN209963842U CN 209963842 U CN209963842 U CN 209963842U CN 201921220620 U CN201921220620 U CN 201921220620U CN 209963842 U CN209963842 U CN 209963842U
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Abstract
The utility model relates to a split brushless motor for an electric circular saw, which comprises a stator component; the stator assembly comprises a stator core; the stator iron core is of a 12-slot winding structure; the stator core comprises stator slots and winding teeth, and the stator slots are in a straight slot form; the width of the winding teeth is 3mm, the length of the winding teeth extending inwards from the inner wall of the back of the stator core is 10.5mm, the tooth space is 2.7mm, the outer diameter of the stator core is 66mm, and the diameter of the inner wall of the back of the stator core is 59 mm. The utility model discloses a split type brushless motor for electric circular saw, the design of specific dimension improves the stability of motor low-speed start and promotes the work efficiency of motor, and the electric current is littleer under the same moment of torsion, makes more battery packages can satisfy the power demand of electric circular saw; the rotation and reversing processes are smoother, the stable running of the electric circular saw is ensured, and the torque fluctuation and the motor vibration noise can be reduced.
Description
Technical Field
The utility model relates to an electric tool field especially relates to a split type brushless motor for electric circular saw.
Background
The electric circular saw has a wide application in the cutting field due to its convenience in use, labor saving, etc., and it can be used for cutting wood, stone, etc. in general. To current electric circular saw, we both hope to improve output speed through the rotational speed that improves inner rotor brushless motor, but output torque can reduce like this and the noise is great to make electric circular saw's cutting ability reduce, we hope again to improve output torque through reducing the rotational speed simultaneously, but can make output speed reduce like this and can not satisfy the cutting requirement, thereby influence electric circular saw's cutting speed, consequently, have the technical contradiction that a needs solved among the electric circular saw to current.
At present, domestic battery packs in the market can not discharge large current for a long time, the high-power requirement of a cordless electric tool is difficult to realize under the condition of using the existing battery packs, and if an imported battery core is used, the problem of discharging large current can be solved, but the price is increased.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides a split type brushless motor for electric circular saw rotates steadily, and the electric current is littleer under the same moment of torsion, makes more battery packages can satisfy electric circular saw's power demand.
The utility model provides a technical scheme that its technical problem adopted is: a split type brushless motor for an electric circular saw comprises a stator assembly; the stator assembly comprises a stator core; the stator iron core is of a 12-slot winding structure; the stator core comprises stator slots and winding teeth, and the stator slots are in a straight slot form; the width of the winding teeth is 3mm, the length of the winding teeth extending inwards from the inner wall of the back of the stator core is 10.5mm, the tooth space is 2.7mm, the outer diameter of the stator core is 66mm, and the diameter of the inner wall of the back of the stator core is 59 mm.
The stator core is formed by silicon steel sheets through the first anchor point in an overlying mode; the first anchor points are square anchor points, six of the first anchor points are arranged, and the first anchor points are uniformly distributed on the stator iron core at 60 degrees; the size of the first anchor point is 0.8 x 2.5 mm; the diameter of the circle formed by the centers of the first anchor points is 56.5 mm.
The stator assembly further comprises a front bobbin, a rear bobbin and a stator coil; the front winding frame and the rear winding frame are buckled on the front side and the rear side of the stator core respectively, and the shapes of the front winding frame and the rear winding frame correspond to the front side and the rear side of the stator core respectively; the stator coil is wound on the front winding frame and the rear winding frame; the front and rear bobbins form an insulating layer between the stator core and the stator coil.
The brushless motor further comprises a rotor assembly; the rotor assembly comprises a rotor core and a rotating shaft inserted in the rotor core; the rotor core is circumferentially and uniformly distributed with 8 permanent magnets, and each permanent magnet is mutually separated; the rotor component and the stator component form a 12-slot 8-pole structure; the rotor core is inserted into the inner ring of the stator assembly, and the maximum excircle diameter of the rotor core is 37 mm; the air gap between the rotor core and the stator core is 0.5 mm.
The rotor iron core is formed by silicon steel sheets through second anchor points in an overlying mode; the second anchor points are four square anchor points and are uniformly distributed on the rotor iron core at 90 degrees; the second anchor point has a size of 0.8 x 2.5 mm; the diameter of the circle formed by the centers of the second anchor points is 26 mm.
And the center of the circle of the silicon steel sheet of the rotor core is provided with a shaft hole with the diameter of 12.5mm for placing the rotating shaft.
The rotor core's circumferencial direction evenly is provided with 8 magnet steel grooves, and 8 permanent magnets insert respectively in 8 magnet steel grooves, and every permanent magnet's thickness is 2.03mm, and the width is 11.07 mm.
The rotor assembly further comprises a front dynamic balance ring and a rear dynamic balance ring; the front dynamic balance ring and the rear dynamic balance ring are respectively arranged on the front side and the rear side of the rotor core and used for preventing the permanent magnet from axially moving and increasing the balance weight, and the stability of the rotor in the rotating process is ensured.
The rotor assembly further comprises a fan fixed on the rotating shaft and located in front of the rotor core, a front bearing located in front of the fan, and a rear bearing located behind the rotor core.
The brushless motor also comprises a shell and a wind shield; the stator assembly is inserted in the inner cavity of the shell; the rotor assembly is connected with the shell in a matched manner through a rear bearing; the windshield cover is fixedly connected with the shell through a fastener; the stator assembly is circumferentially and axially fixed through the wind shield and the shell.
The utility model has the advantages that: the utility model discloses a split type brushless motor for electric circular saw, the design of specific dimension further improves the stability of motor low-speed start and promotes the work efficiency of motor, and the electric current is littleer under the same moment of torsion, makes more battery packages can satisfy the power demand of electric circular saw; the brushless motor to the design of electric circular saw adopts 12 groove 8 utmost point structures, can improve the power density of motor, guarantees that the maximum torque of motor, starting torque, efficiency and power satisfy electric circular saw's user demand, can do benefit to the manufacturing and the use of die again in manufacturing process, still can be more level and smooth at the rotation with the switching-over process than the current low groove number motor that is used for electric circular saw, guarantees that electric circular saw moves steadily stably, and can reduce moment fluctuation and motor vibration noise.
Drawings
Fig. 1 is a perspective view illustrating a split type brushless motor for an electric circular saw according to an embodiment;
fig. 2 is a schematic view of an internal structure of a split type brushless motor for an electric circular saw according to an embodiment;
fig. 3 is an exploded view schematically illustrating a split type brushless motor for an electric circular saw according to an embodiment;
fig. 4 is a schematic view of a stator core and a rotor core of a split type brushless motor for an electric circular saw according to an embodiment;
fig. 5 is a front view schematically illustrating a split type brushless motor for an electric circular saw according to an embodiment;
fig. 6 is a schematic cross-sectional view a-a of fig. 5.
Detailed Description
In order to deepen the understanding of the present invention, the present invention will be described in further detail with reference to the accompanying drawings and embodiments, which are only used for explaining the present invention and are not limited to the protection scope of the present invention.
Examples
As shown in fig. 1 to 6, the present embodiment provides a split type brushless motor for an electric circular saw, which includes a stator assembly 3; the stator assembly 3 includes a stator core 302; the stator core 302 is of a 12-slot winding structure; the stator core 302 comprises stator slots 306 and winding teeth 305, the stator slots 306 being in the form of straight slots; the width of the winding teeth 305 is 3mm, the length extending inwards from the inner wall of the back of the stator core 302 is 10.5mm, the tooth space is 2.7mm, the outer diameter of the stator core 302 is 66mm, and the diameter of the inner wall of the back of the stator core 302 is 59 mm; the stator core 302 is formed by silicon steel sheets through the first anchor point 304 in an overlying mode; the first anchor points 304 are square anchor points, six of which are uniformly distributed on the stator core at 60 degrees; the first anchor point 304 has a size of 0.8 x 2.5 mm; the diameter of the circle formed by the centers of the first anchor points 304 is 56.5 mm; the stator assembly 3 further comprises a front bobbin 301, a rear bobbin 303 and a stator coil; the front bobbin 301 and the rear bobbin 303 are respectively buckled at the front side and the rear side of the stator core 302, and the shapes of the front bobbin 301 and the rear bobbin 303 are respectively corresponding to the front side and the rear side of the stator core 302; the stator coils are wound on the front bobbin 301 and the rear bobbin 303; the front bobbin 301 and the rear bobbin 303 constitute an insulating layer of the stator core 302 and the stator coil; the brushless motor further comprises a rotor assembly 2; the rotor assembly 2 includes a rotor core 205 and a rotating shaft 201 inserted in the rotor core 205; 8 permanent magnets 208 are uniformly distributed on the rotor core 205 in the circumferential direction, and each permanent magnet 208 is separated from each other; the rotor assembly 2 and the stator assembly 3 form a 12-slot 8-pole structure; the rotor core is inserted into the inner ring of the stator assembly 3, and the maximum outer circle diameter of the rotor core 205 is 37 mm; the air gap between rotor core 205 and stator core 302 is 0.5 mm; the rotor core 205 is formed by laminating silicon steel sheets through a second anchor point 209; the second anchor points 209 are square anchor points, four of which are uniformly distributed on the rotor core at 90 degrees; the second anchor point 209 has a size of 0.8 x 2.5 mm; the diameter of the circle formed by the centers of the second anchor points 209 is 26 mm; the silicon steel sheet of the rotor core 205 is provided with a shaft hole 210 with a diameter of 12.5mm at the center of a circle, and the shaft hole is used for placing the rotating shaft 201; 8 magnetic steel slots are uniformly arranged in the circumferential direction of the rotor core 205, 8 permanent magnets 208 are respectively inserted into the 8 magnetic steel slots, the thickness of each permanent magnet is 2.03mm, and the width of each permanent magnet is 11.07 mm; the rotor assembly 2 further comprises a front dynamic balancing ring 204 and a rear dynamic balancing ring 206; the front dynamic balance ring 204 and the rear dynamic balance ring 206 are respectively arranged on the front side and the rear side of the rotor core 205 and are used for preventing the axial movement of the permanent magnet and increasing the balance weight, so that the stability of the rotor in the rotating process is ensured; the rotor assembly 2 further comprises a fan 203 fixed on the rotating shaft 201 and positioned in front of the rotor core 205, a front bearing 202 positioned in front of the fan 203, and a rear bearing 207 positioned behind the rotor core 205; the brushless motor also comprises a shell 4 and a wind shield 1; the stator component 3 is inserted into the inner cavity of the shell 4; the rotor assembly 2 is matched and connected with the shell 4 through a rear bearing 207; the windshield cover 1 is fixedly connected with the shell 4 through a fastener; the stator assembly 3 is fixed circumferentially and axially by the windshield 1 and the housing 4.
According to the split brushless motor for the electric circular saw, the number of stator slots of the direct current motor is increased, the magnetomotive force of the motor is better, the leakage reactance of the direct current motor is reduced, the maximum torque and the starting torque are increased, the efficiency and power factors are slightly increased, the number of slots is increased, the windings are dispersed, the heat dissipation area of the windings contacting with an iron core is increased, and the heat dissipation is facilitated; therefore, a structure in which the number of grooves is 12 grooves and 8 steps is preferable.
The split brushless motor for the electric circular saw in the embodiment has the advantages that the axial direction and the circumferential direction of the stator assembly are fixed only by means of two screws which penetrate through two internal thread columns 101 distributed in the circumferential direction of the wind shielding ring by 180 degrees and penetrate through the semicircular groove 307 arranged along the axial direction of the stator core 302 and the threaded hole 5 of the shell, so that the cost is saved, and the motor structure is convenient to install.
According to the split brushless motor for the electric circular saw, the design of a specific size further improves the low-speed starting stability of the motor and the working efficiency of the motor, the current is smaller under the same torque, and more battery packs can meet the power requirement of the electric circular saw; the brushless motor to the design of electric circular saw adopts 12 groove 8 utmost point structures, can improve the power density of motor, guarantees that the maximum torque of motor, starting torque, efficiency and power satisfy electric circular saw's user demand, can do benefit to the manufacturing and the use of die again in manufacturing process, still can be more level and smooth at the rotation with the switching-over process than the current low groove number motor that is used for electric circular saw, guarantees that electric circular saw moves steadily stably, and can reduce moment fluctuation and motor vibration noise.
The above-mentioned embodiments should not limit the present invention in any way, and all the technical solutions obtained by adopting equivalent replacement or equivalent conversion fall within the protection scope of the present invention.
Claims (10)
1. The utility model provides a split type brushless motor for electric circular saw which characterized in that: comprises a stator component; the stator assembly comprises a stator core; the stator iron core is of a 12-slot winding structure; the stator core comprises stator slots and winding teeth, and the stator slots are in a straight slot form; the width of the winding teeth is 3mm, the length of the winding teeth extending inwards from the inner wall of the back of the stator core is 10.5mm, the tooth space is 2.7mm, the outer diameter of the stator core is 66mm, and the diameter of the inner wall of the back of the stator core is 59 mm.
2. The split type brushless motor for the electric circular saw as claimed in claim 1, wherein: the stator core is formed by silicon steel sheets through the first anchor point in an overlying mode; the first anchor points are square anchor points, six of the first anchor points are arranged, and the first anchor points are uniformly distributed on the stator iron core at 60 degrees; the size of the first anchor point is 0.8 x 2.5 mm; the diameter of the circle formed by the centers of the first anchor points is 56.5 mm.
3. The split type brushless motor for the electric circular saw as claimed in claim 1, wherein: the stator assembly further comprises a front bobbin, a rear bobbin and a stator coil; the front winding frame and the rear winding frame are buckled on the front side and the rear side of the stator core respectively, and the shapes of the front winding frame and the rear winding frame correspond to the front side and the rear side of the stator core respectively; the stator coil is wound on the front winding frame and the rear winding frame; the front and rear bobbins form an insulating layer between the stator core and the stator coil.
4. The split type brushless motor for the electric circular saw as claimed in claim 1, wherein: also includes a rotor assembly; the rotor assembly comprises a rotor core and a rotating shaft inserted in the rotor core; the rotor core is circumferentially and uniformly distributed with 8 permanent magnets, and each permanent magnet is mutually separated; the rotor component and the stator component form a 12-slot 8-pole structure; the rotor core is inserted into the inner ring of the stator assembly, and the maximum excircle diameter of the rotor core is 37 mm; the air gap between the rotor core and the stator core is 0.5 mm.
5. The split type brushless motor for the electric circular saw of claim 4, wherein: the rotor iron core is formed by silicon steel sheets through second anchor points in an overlying mode; the second anchor points are four square anchor points and are uniformly distributed on the rotor iron core at 90 degrees; the second anchor point has a size of 0.8 x 2.5 mm; the diameter of the circle formed by the centers of the second anchor points is 26 mm.
6. The split type brushless motor for the electric circular saw of claim 5, wherein: and the center of the circle of the silicon steel sheet of the rotor core is provided with a shaft hole with the diameter of 12.5mm for placing the rotating shaft.
7. The split type brushless motor for the electric circular saw of claim 4, wherein: the rotor core's circumferencial direction evenly is provided with 8 magnet steel grooves, and 8 permanent magnets insert respectively in 8 magnet steel grooves, and every permanent magnet's thickness is 2.03mm, and the width is 11.07 mm.
8. The split type brushless motor for the electric circular saw of claim 4, wherein: the rotor assembly further comprises a front dynamic balance ring and a rear dynamic balance ring; the front dynamic balance ring and the rear dynamic balance ring are respectively arranged on the front side and the rear side of the rotor core and used for preventing the permanent magnet from axially moving and increasing the balance weight, and the stability of the rotor in the rotating process is ensured.
9. The split type brushless motor for the electric circular saw of claim 4, wherein: the rotor assembly further comprises a fan fixed on the rotating shaft and located in front of the rotor core, a front bearing located in front of the fan, and a rear bearing located behind the rotor core.
10. The split type brushless motor for the electric circular saw of claim 9, wherein: the wind shield also comprises a shell and a wind shield cover; the stator assembly is inserted in the inner cavity of the shell; the rotor assembly is connected with the shell in a matched manner through a rear bearing; the windshield cover is fixedly connected with the shell through a fastener; the stator assembly is circumferentially and axially fixed through the wind shield and the shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921220620.0U CN209963842U (en) | 2019-07-31 | 2019-07-31 | Split type brushless motor for electric circular saw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921220620.0U CN209963842U (en) | 2019-07-31 | 2019-07-31 | Split type brushless motor for electric circular saw |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209963842U true CN209963842U (en) | 2020-01-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921220620.0U Active CN209963842U (en) | 2019-07-31 | 2019-07-31 | Split type brushless motor for electric circular saw |
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| Country | Link |
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| CN (1) | CN209963842U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11837935B2 (en) | 2021-02-02 | 2023-12-05 | Black & Decker, Inc. | Canned brushless motor |
-
2019
- 2019-07-31 CN CN201921220620.0U patent/CN209963842U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11837935B2 (en) | 2021-02-02 | 2023-12-05 | Black & Decker, Inc. | Canned brushless motor |
| US11855521B2 (en) | 2021-02-02 | 2023-12-26 | Black & Decker, Inc. | Brushless DC motor for a body-grip power tool |
| US11870316B2 (en) | 2021-02-02 | 2024-01-09 | Black & Decker, Inc. | Brushless motor including a nested bearing bridge |
| US11876424B2 (en) | 2021-02-02 | 2024-01-16 | Black & Decker Inc. | Compact brushless motor including in-line terminals |
| US11955863B2 (en) | 2021-02-02 | 2024-04-09 | Black & Decker Inc. | Circuit board assembly for compact brushless motor |
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