Hand-held power tools, bench tools and outdoor tools

Abstract

The application discloses a handheld electric tool, comprising: a housing formed with a holding part for a user to hold; a motor arranged in the housing for driving a functional accessory to realize the function of the handheld electric tool; the output power of the motor is greater than or equal to 120 W and less than or equal to 4500 W; the motor at least comprises a stator, a rotor and a plurality of coil windings arranged on the stator; the cross section of the coil winding is a non-circular cross section, and the slot fill factor of the motor is greater than or equal to 40%. The above scheme can provide a handheld electric tool with high motor working efficiency, low power consumption and effective inhibition of motor temperature rise.

Description

Technical Field

[0001] This application relates to a handheld power tool, a benchtop tool, and an outdoor tool, specifically a motor used in the aforementioned power tool. Background Technology

[0002] Currently, most motors used in power tools employ circular cross-section copper wire for their coil windings. When these coil windings are wound onto the stator core, on the one hand, the shape of the coil windings results in a relatively low slot fill factor, thus affecting the overall efficiency of the motor. On the other hand, the motor generates a significant amount of heat during operation, and the gaps between the coils reduce their thermal conductivity, further impacting the motor's heat dissipation. Summary of the Invention

[0003] To address the shortcomings of related technologies, this application provides a brushless motor suitable for power tools. The brushless motor described above can effectively improve the working efficiency of power tools, reduce power consumption, and effectively suppress temperature rise.

[0004] To achieve the above objectives, this application adopts the following technical solution:

[0005] A handheld power tool includes: a housing with a grip portion for a user to hold; a motor disposed within the housing for driving functional accessories to achieve the function of the handheld power tool; the motor has an output power greater than or equal to 120W and less than or equal to 4500W; the motor includes at least a stator, a rotor, and a plurality of coil windings disposed on the stator; the cross-section of the coil windings is non-circular, and the slot fill factor of the motor is greater than or equal to 40%.

[0006] In some embodiments, the stator includes a stator core formed by stacking a plurality of stator laminations and an insulating member disposed on the stator core; the coil winding is wound on the insulating member.

[0007] In some embodiments, the outer diameter of the stator lamination is greater than or equal to 30 mm and less than or equal to 100 mm; the inner diameter of the stator lamination is greater than or equal to 10 mm and less than or equal to 60 mm.

[0008] In some embodiments, the stack length of the stator core is greater than or equal to 5 mm and less than or equal to 80 mm.

[0009] In some embodiments, the stator core is formed by joining together a plurality of segmented cores that are divided in their circumferential direction.

[0010] In some embodiments, the cross-section of the coil winding includes rectangular, elliptical, and gradient shapes.

[0011] In some embodiments, the cross-sectional area of ​​the coil winding is set to be less than or equal to 5 mm². 2 .

[0012] In some embodiments, the motor speed is greater than or equal to 15,000 rpm and less than or equal to 60,000 rpm.

[0013] In some embodiments, the output torque of the motor is greater than or equal to 0.1 N·m and less than or equal to 8 N·m.

[0014] In some embodiments, the proportion of the high-efficiency zone in the motor efficiency is greater than or equal to 20%, and the high-efficiency zone is set as the region where the motor efficiency is greater than or equal to 80%.

[0015] In some embodiments, the motor is a brushless motor, which is driven by a drive circuit.

[0016] In some embodiments, the handheld power tool further includes a battery pack detachably connected to the housing, the battery pack having a rated output voltage greater than or equal to 12V.

[0017] A benchtop tool includes: a worktable having a working surface for placing a workpiece; a saw blade acting on the workpiece; and a motor driving the saw blade to rotate. The motor includes at least a stator, a rotor, and a plurality of coil windings disposed on the stator. The output power of the motor is greater than or equal to 500W and less than or equal to 5000W. The cross-section of the coil windings is non-circular, and the slot fill factor of the motor is greater than or equal to 40%.

[0018] In some embodiments, the stator includes a stator core formed by stacking a plurality of stator laminations and an insulating member disposed on the stator core; the coil winding is wound on the insulating member.

[0019] In some embodiments, the outer diameter of the stator lamination is greater than or equal to 40 mm and less than or equal to 120 mm; the inner diameter of the stator lamination is greater than or equal to 20 mm and less than or equal to 70 mm.

[0020] In some embodiments, the stack length of the stator core is greater than or equal to 30 mm and less than or equal to 120 mm.

[0021] In some embodiments, the stator core is formed by joining together a plurality of segmented cores that are divided in their circumferential direction.

[0022] In some embodiments, the cross-section of the coil winding includes rectangular, elliptical, and gradient shapes.

[0023] In some embodiments, the cross-sectional area of ​​the coil winding is set to be less than or equal to 5 mm².2 .

[0024] In some embodiments, the motor speed is greater than or equal to 15,000 rpm and less than or equal to 60,000 rpm.

[0025] In some embodiments, the output torque of the motor is greater than or equal to 0.5 N·m and less than or equal to 10 N·m.

[0026] In some embodiments, the proportion of the high-efficiency zone in the motor efficiency is greater than or equal to 20%; the high-efficiency zone is set as the region where the motor efficiency is greater than or equal to 80%.

[0027] In some embodiments, the motor is a brushless motor, which is driven by a drive circuit.

[0028] In some embodiments, the benchtop tool further includes a battery pack that provides power, the battery pack having a rated output voltage greater than or equal to 18V.

[0029] An outdoor tool includes: a housing; a power output assembly including at least one motor; an operating device for an operator to control the outdoor tool; the motor has an output power greater than or equal to 500W and less than or equal to 5000W; the motor includes at least a stator, a rotor, and a plurality of coil windings disposed on the stator; wherein the cross-section of the coil windings is a non-circular cross-section, and the slot fill factor of the motor is greater than or equal to 40%.

[0030] In some embodiments, the stator includes a stator core formed by stacking a plurality of stator laminations and an insulating member disposed on the stator core; the coil winding is wound on the insulating member.

[0031] In some embodiments, the outer diameter of the stator lamination is greater than or equal to 30 mm; the inner diameter of the stator lamination is greater than or equal to 10 mm.

[0032] In some embodiments, the stack length of the stator core is greater than or equal to 10 mm and less than or equal to 100 mm.

[0033] In some embodiments, the stator core is formed by joining together a plurality of segmented cores that are divided in their circumferential direction.

[0034] In some embodiments, the cross-section of the coil winding includes rectangular, elliptical, and gradient shapes.

[0035] In some embodiments, the cross-sectional area of ​​the coil winding is set to be less than or equal to 5 mm². 2 .

[0036] In some embodiments, the motor speed is greater than or equal to 2000 rpm and less than or equal to 100000 rpm.

[0037] In some embodiments, the output torque of the motor is greater than or equal to 0.2 N·m and less than or equal to 20 N·m.

[0038] In some embodiments, the proportion of the high-efficiency zone in the motor efficiency is greater than or equal to 20%; the high-efficiency zone is set as the region where the motor efficiency is greater than or equal to 80%.

[0039] In some embodiments, the motor is a brushless motor, which is driven by a drive circuit.

[0040] In some embodiments, the outdoor tool further includes a battery pack with a rated output voltage greater than or equal to 18V.

[0041] In the technical solution of this application, a brushless motor with a non-circular cross-section of the coil winding is used in handheld power tools, benchtop power tools and outdoor tools. By increasing the slot fill factor of the brushless motor, the proportion of the high-efficiency zone of the motor efficiency is increased, thereby improving the working efficiency of the power tool and effectively suppressing temperature rise. Attached Figure Description

[0042] Figure 1 This is a perspective structural diagram of the handheld power tool used as the first embodiment in this application;

[0043] Figure 2 This is a three-dimensional structural diagram of the external rotor brushless motor in this application;

[0044] Figure 3 yes Figure 2 A partial exploded view of the brushless motor in the image;

[0045] Figure 4 yes Figure 2 A partial exploded view of the stator core of the brushless motor in the image;

[0046] Figure 5 This is a three-dimensional structural diagram of a part of the brushless motor from another perspective;

[0047] Figure 6 yes Figure 4 A three-dimensional structural diagram of the stator core of a brushless motor from another perspective;

[0048] Figure 7 This is an exploded view of one of the segmented cores of the stator core;

[0049] Figure 8 It is a three-dimensional structural diagram of a segmented iron core with coil windings.

[0050] Figure 9 It is a three-dimensional structural diagram of a stator core with coil windings.

[0051] Figure 10 yes Figure 9 A cross-sectional view of the stator core in the middle;

[0052] Figure 11 It is a three-dimensional structural diagram of a printed circuit board with conductive components arranged on it.

[0053] Figure 12 This is another three-dimensional structural diagram of a printed circuit board with conductive components arranged thereon.

[0054] Figure 13 A three-dimensional structural diagram of the internal rotor brushless motor in this application;

[0055] Figure 14 Figure 13 A three-dimensional structural diagram of the internal rotor brushless motor from another perspective;

[0056] Figure 15 This is the control principle diagram of a brushless motor;

[0057] Figure 16 This is a MAP diagram showing the motor efficiency of a circular wire motor.

[0058] Figure 17 This is a MAP diagram showing the motor efficiency of a flat wire motor.

[0059] Figure 18 A perspective structural diagram of a table-type tool as another embodiment in this application;

[0060] Figure 19 This application presents a perspective structural diagram of an outdoor tool as yet another embodiment. Detailed Implementation

[0061] The present application will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0062] Figures 1 to 18 and Figure 19 Specific embodiments of this application as power tools are shown, such as electric drills, table saws, and smart lawnmowers. In fact, the motors taught in this application are applicable to handheld power tools such as electric drills, electric wrenches, electric screwdrivers, hammer drills, circular saws, and sanders; table-type tools such as table saws; and outdoor tools such as lawnmowers, snowplows, lawn trimmers, electric shears, pruning shears, and chainsaws. Clearly, the following embodiments are only a portion of, and not all, of the embodiments of this application.

[0063] Figure 1A handheld power tool, as a specific embodiment of this application, is shown. Specifically, this handheld power tool is an electric drill. The drill 100 can at least provide torque to assist in driving screws into workpieces and can provide impact force for impact operations to meet the user's needs.

[0064] Reference Figure 1 and Figure 2 The electric drill 100 includes a housing 10 with a grip 11 for the user to hold. One end of the grip 11 is connected to a power interface for connecting to a DC or AC power source. In some embodiments, the power interface is connected to a battery pack 20 detachably connected to the housing 10. Of course, the power interface can also be connected to AC power, such as mains power. In this embodiment, the battery pack 20 is used as the power source for the electric drill 100. Specifically, the rated output voltage of the battery pack 20 is greater than or equal to 12V. A main control switch 111 is also provided on the grip 11 for controlling the start and stop of the electric drill 100. Of course, in some embodiments, the main control switch 111 can also realize a speed adjustment function, and the user controls the speed of the electric drill 100 by controlling the stroke of the main control switch 111. The housing 10 has a receiving space (not shown) along the first straight line 101, and a fan 30, a motor 40, and a transmission assembly (not shown) are sequentially arranged in the receiving space. The motor 40 is supported by the housing 10 and drives the output shaft (not shown) to rotate the drill bit. In this embodiment, motor 40 is configured as a brushless motor, and in the following description, brushless motor 40 will be used instead of motor 40.

[0065] See Figures 2 to 4 As shown, the brushless motor 40 in this embodiment is configured as an external rotor type brushless motor and is housed within the housing 10 in an orientation parallel to the first straight line 101. Specifically, the brushless motor 40 includes a stator 41, a rotor 42 located outside the stator 41, and a motor shaft 43. The stator 41 has a stator core 411, an insulating member 412 disposed on the stator core 411, and a plurality of coil windings 413 wound on the stator core 411 with the insulating member 412 in between. The rotor 42 is disposed circumferentially outside the stator 41. Specifically, a plurality of permanent magnets 421 are uniformly distributed on the inner side of the rotor 42.

[0066] In some embodiments, the stator core 411 has a one-piece structure. In another embodiment, the stator core 411 has a segmented structure. In this embodiment, the stator core 411 has a segmented structure. Specifically, in this embodiment, the stator core 411 preferably has a spliced ​​structure. The specific structure and splicing method of the stator core 411 in this embodiment will be described below.

[0067] In some embodiments, see Figure 4As shown, the stator core 411 is formed by joining together multiple segmented cores 411a that are divided in the circumferential direction. Straight slots 4112b and bosses 4112c extending along the motor shaft 413 are formed on each segmented core 411a. When the multiple segmented cores 411a are assembled into the stator core 411, the straight slot 4112b on each segmented core 411a forms a snap-fit ​​structure with the boss 4112c of the adjacent segmented core 411a to limit the stator core 411 in a plane perpendicular to the motor shaft 43.

[0068] In some embodiments, see Figure 5 As shown, the stack length L of the stator core 411 is greater than or equal to 5 mm and less than or equal to 80 mm. In some embodiments, the stack length L of the stator core 411 is greater than or equal to 5 mm and less than or equal to 25 mm. In some embodiments, the stack length L of the stator core 411 is greater than or equal to 25 mm and less than or equal to 50 mm. In some embodiments, the stack length L of the stator core 411 is greater than or equal to 50 mm and less than or equal to 70 mm. In some embodiments, the stack length L of the stator core 411 is greater than or equal to 70 mm and less than or equal to 80 mm.

[0069] In some embodiments, see Figure 6 As shown, the outer diameter D1 of the stator lamination 4111 is greater than or equal to 30 mm and less than or equal to 100 mm. In some embodiments, the outer diameter D1 of the stator lamination is greater than or equal to 30 mm and less than or equal to 50 mm. In some embodiments, the outer diameter D1 of the stator lamination is greater than or equal to 50 mm and less than or equal to 70 mm. In some embodiments, the outer diameter D1 of the stator lamination is greater than or equal to 70 mm and less than or equal to 100 mm. The inner diameter D2 of the stator lamination is greater than or equal to 10 mm and less than or equal to 60 mm. In some embodiments, the inner diameter D2 of the stator lamination is greater than or equal to 10 mm and less than or equal to 30 mm. In some embodiments, the inner diameter D2 of the stator lamination is greater than or equal to 30 mm and less than or equal to 60 mm.

[0070] See Figure 4 and Figure 7 As shown, the stator core 411 is formed by stacking multiple stator laminations 4111 in a direction parallel to the motor shaft 43. The stator core 411 also includes fixing pins 4113 for fixing the multiple stator laminations 4111. The stator laminations 4111 are provided with through holes 4112, and the fixing pins 4113 can pass through the through holes 4112 to fix the stator laminations 4111.

[0071] See Figure 7 and Figure 8As shown, the stator core 411 also includes a plurality of stator teeth 4114 extending inward along the circumference, and an insulating member 412 is disposed on the plurality of stator teeth 4114. Specifically, the insulating member 412 includes a front insulator 412a and a rear insulator 412b. The coil winding 413 is wound on the stator teeth 4114 with the front insulator 412a and the rear insulator 412b in between. Specifically, the front insulator 412a is sleeved on the front side of the stator teeth 4114, and the rear insulator 412b is sleeved on the rear side of the stator teeth 4114. The coil winding 413 reciprocates on the front insulator 412a and the rear insulator 412b, that is, the coil winding 413 is wound on the stator teeth 4114 with the front insulator 412a and the rear insulator 412b in between.

[0072] Next, we will combine Figures 8 to 10 The shape of the coil winding 413 on the stator 41, the way it is wound on the stator 41, and the wiring method are described in detail.

[0073] In this embodiment, the cross-section of the coil winding 413 is non-circular. Specifically, the cross-section of the coil winding 413 can be set as a rectangle, an ellipse, a gradient shape, or a combination thereof. Preferably, in this embodiment, the cross-section of the coil winding 413 is rectangular, and the cross-sectional area of ​​the coil winding 413, i.e., the rectangular area, is set to be less than or equal to 5 mm². 2 In some embodiments, the cross-sectional area of ​​the coil winding 413 is set to be less than or equal to 3 mm². 2 .

[0074] The stator core 411 is assembled from multiple segmented cores 411a along the circumferential direction. The installation method between adjacent segmented cores 411a has been described in detail above and will not be repeated here. See also Figure 8 As shown, taking one of the segmented iron cores 411a as an example, the coil winding 413 is wound onto the stator teeth 4114 to form an input end 4131 and an output end 4132. During the assembly process of the stator 41, the coil winding 413 is first wound onto the stator teeth 4114 of each segmented iron core 411a, and then all the segmented iron cores 411a with the coil winding 413 wound on them are limited and fixed by the snap-fit ​​structure described above and assembled into the stator 41. Preferably, in this embodiment, the brushless motor 40 is set as a three-phase brushless motor, and the stator iron core 411 is composed of 12 segmented iron cores 411a.

[0075] Figure 9A stator core 411 with coil windings 413 is shown. Each segmented core 411a has a coil winding 413 with an input end 4131 and an output end 4132. Let any one segmented core 411a in the stator core 411 be designated 1#, then sequentially designated in a counter-clockwise direction as segmented core 2#, segmented core 3#, segmented core 4#, segmented core 5#, segmented core 6#, segmented core 7#, segmented core 8#, segmented core 9#, segmented core 10#, segmented core 11#, and segmented core 12#. Each segmented core has a coil winding 413 wound on it, and each coil winding 413 has an input end 4131 and an output end 4132. In one specific embodiment, segmented iron cores 1#, 2#, 7#, and 8#, along with the coil winding 413 wound on them, constitute one phase of the three-phase brushless motor 40. Segmented iron cores 3#, 4#, 9#, and 10#, along with the coil winding 413 wound on them, constitute one phase of the three-phase brushless motor 40. Segmented iron cores 5#, 6#, 11#, and 12#, along with the coil winding 413 wound on them, constitute one phase of the three-phase brushless motor 40. The above-described allocation method constitutes the three phases of the three-phase brushless motor 40. Of course, those skilled in the art can use other numbers of segmented iron cores or other allocation methods for electrical connection, and this application does not impose any limitations on this.

[0076] See Figure 3 As shown, the three-phase brushless motor 40 also includes a printed circuit board 44. The printed circuit board 44 is fixedly disposed on one side of the stator 41 and is used to realize the conductive connection between the coil windings 413 on the stator core 411a of the three-phase brushless motor 40.

[0077] Taking one phase of a three-phase brushless motor 40 as an example, see... Figure 10 As shown, the coil winding 413 on the segmented iron core 1# enters at 1a and exits at 1b, winding along the direction of the stator teeth 4114. It then enters at 2a and exits at 2b to form the first layer of winding. This winding pattern is repeated to form the second layer of winding, and finally, it exits at 3b to form the third layer of winding. Since the width of the stator teeth 4114 is basically consistent along their extension direction, the space between adjacent stator teeth 4114 for placing the coil winding 413 gradually decreases along the extension direction of the stator teeth 4114. Therefore, the length of the first layer of winding in the extension direction of the stator teeth 4114 is greater than the length of the second layer of winding in the extension direction of the stator teeth 4114. The length of the second layer of winding in the extension direction of the stator teeth 4114 is greater than the length of the third layer of winding in the extension direction of the stator teeth 4114.

[0078] In this embodiment, the coil winding 413 is wound in the manner described above, which ensures that the slot fill factor of the brushless motor 40 is greater than or equal to 40%.

[0079] Specifically, see Figure 10 As shown, the coil winding 413 on segmented iron core 1# has an input terminal 4131 at 1a and an output terminal 4132 at 3b. The coil winding 413 on segmented iron core 2# has an input terminal 4131 at 4a and an output terminal 4132 at 5b. The output terminal 4132 at 3b of the coil winding 413 on segmented iron core 1# and the input terminal 4131 at 4a of the coil winding 413 on segmented iron core 2# are electrically connected via a printed circuit board 44. Similarly, the coil winding 413 on segmented iron core 7# has an input terminal 4131 at 5a and an output terminal 4132 at 6b. The coil winding 413 on segmented iron core 8# has an input terminal 4131 at 7a and an output terminal 4132 at 8b. In this configuration, the lead-out terminal 4132 of the coil winding 413 on segmented iron core 7# at position 6b and the input terminal 4131 of the coil winding 413 on segmented iron core 8# at position 7a are electrically connected via a printed circuit board 44. In some embodiments, the lead-out terminal 4132 of the coil winding 413 on segmented iron core 2# at position 5b and the input terminal 4131 of the coil winding 413 on segmented iron core 7# at position 5a are electrically connected via a printed circuit board 44. The above wiring method represents the wiring of one phase of the brushless motor 40. It is understood that the wiring methods for the other two phases are similar and will not be described further here.

[0080] In some embodiments, conductive components are arranged on the printed circuit board 44 for electrically connecting the coil winding 413. See also... Figure 11 As shown, the conductive component includes a conductive element 73 and a copper foil 72. The copper foil 72 is disposed on the printed circuit board 44 and connected in parallel with the conductive element 73. The conductive element 73 and the copper foil 72 replace the wiring and connection of the coil winding 413 around the outer periphery of the stator core 411 in related technologies, effectively reducing line crossings and simplifying connections. Furthermore, it avoids the large height space occupied by the lead-in and lead-out wires of multiple coil windings arranged along the motor axis in related structures. This application effectively reduces the space occupied at the motor end, optimizes wiring, reduces the overall height of the motor, thereby increasing the motor power density and improving connection efficiency. Thus, placing the conductive element 73 and the copper foil 72 on the printed circuit board 44 makes the structural connection stable and reliable, reduces risk, and is more cost-effective. In some embodiments, the conductive element 73 and the copper foil 72 can be soldered to the coil winding 413.

[0081] In some embodiments, the sum of the cross-sectional areas of the conductive element 73 and the copper foil 72 is Scu, and the sum of the cross-sectional areas of the coil windings 413 welded to the corresponding conductive element 73 and copper foil 72 is Sw, where Sw = N × S0. Here, N is the number of coil windings 413 at the welding point, S0 is the cross-sectional area of ​​a single coil winding 413, and Scu ≥ Sw. By increasing the cross-sectional areas of the conductive element 73 and the copper foil 72 to be larger than the cross-sectional area of ​​the coil windings 413 welded to them, it is ensured that a large current on the coil windings 413 can stably pass through the conductive element 73 and the copper foil 72. It should be noted that the cross-sectional area refers to the area of ​​the cross-section substantially perpendicular to the direction of current flow.

[0082] In some embodiments, copper foil 72 and conductive element 73 connect the windings on each slot of the stator core 411. Coil windings 413 belonging to the same phase are connected in series and parallel via copper foil 72 and conductive element 73. Then, phase-to-phase connections are made in a delta or Y configuration to form the motor's input and output lines. In this embodiment, the cross-sectional area of ​​the coil winding 413 refers to each phase of the motor. When the current is large, the copper foil 72 and conductive element 73 will not be burned out by the high current. In some embodiments, the motor is a three-phase motor.

[0083] In one embodiment, the outer periphery of the printed circuit board 44 is provided with a plurality of radially recessed grooves 711, and the conductive element 73 extends and is disposed in the grooves 711 for connection with the coil winding 413, so as to facilitate the soldering of the coil winding 413.

[0084] Because copper has good electrical conductivity, in one embodiment, the conductive element 73 is a copper strip to improve conductivity and thus improve motor performance. In other embodiments, the conductive element 73 can also be replaced by other conductive wiring or metal stamping parts to achieve the connection between the coil windings 413.

[0085] In one implementation, such as Figure 12 As shown, when the number of coil windings 413 is large, resulting in a large number of solder points, the conductive element 73 is soldered to both the top and bottom of the printed circuit board 44 for a double-sided arrangement, avoiding overcrowding on one side and facilitating layout. When the number of coil windings 413 is small, in another embodiment, the conductive element 73 is soldered to either the top or bottom of the printed circuit board 44 for a single-sided arrangement, simplifying the structure. The specific arrangement is determined according to the actual situation and is not limited.

[0086] In one embodiment, the thickness of the printed circuit board 44 is 0.8mm≤h≤5mm, where the thickness refers to the thickness of the printed circuit board 44 itself, excluding the thickness of the soldered conductive parts 73 and solder joints, etc. This avoids the printed circuit board 44 being too thick, which would increase the height of the motor, and also avoids the printed circuit board 44 being too thin, which would affect the structural strength. It has reliability when carrying the conductive parts 73, and it is also convenient for the layout of the conductive parts 73 and copper foil 72 when using multi-layer wiring.

[0087] In some embodiments, see Figure 11 As shown, when the printed circuit board 71 or 70 is relatively thick, a multi-layer wiring method can be adopted. That is, conductive elements 73 are arranged on both the upper and lower surfaces of the printed circuit board 44, and copper foil 72 is arranged in the inner layer of the printed circuit board 44 through the processing technology of the printed circuit board 44. In one embodiment, the printed circuit board 44 has through holes 713, and the conductive elements 73 pass through the through holes 713 so that the conductive elements 73 can pass through to realize the conductive elements 73 traces on both the upper and lower surfaces, thereby reducing the number of conductive elements 73 and solder points.

[0088] In one implementation, such as Figure 11 As shown, the printed circuit board 71 has multiple conductive components 73 on it. There is an insulation distance between the multiple conductive components 73 to ensure that there is a certain insulation distance between the conductive components 73 to avoid insulation failure under harsh working conditions. The specific size of the insulation distance is referred to the relevant technology and will not be described in detail here.

[0089] Considering the size of the motor, in one embodiment, the outer diameter of the printed circuit board 44 is less than or equal to the outer diameter of the stator core 411, thereby reducing the space occupied by the printed circuit board 44 and making it easier to install.

[0090] In some embodiments, the printed circuit board 44 can be fixedly connected to the end of the stator core 411, and the printed circuit board 44 is fixed on the stator core 411 to make the structure installation stable.

[0091] In one implementation, such as Figure 11 As shown, the printed circuit board 44 has a first region and a second region. The first region is covered with copper foil 72, and the second region has at least one heat dissipation hole 712 to achieve heat dissipation, improve safety, and extend service life. The copper foil 72 and the heat dissipation hole 712 are located in different regions to prevent the copper foil 72 from covering the heat dissipation hole 712. The first region and the second region are set according to the actual situation and are not limited. In some embodiments, the heat dissipation hole 712 and the through hole 713 are different, specifically, they may be different in size, shape, etc., to prevent errors when routing the conductive component 73.

[0092] The brushless motor 40 in the above embodiments is a brushless motor with an external rotor structure. The technical solution taught in this application can also be applied to brushless motors with an internal rotor structure. The following will combine... Figure 13 and Figure 14 This section introduces the specific structure of an internal rotor brushless motor.

[0093] See Figure 13 As shown, the internal rotor brushless motor includes a stator 51, which includes a stator core 511, an insulating member 512 disposed on the stator core 511, and a coil winding 513 wound on the insulating member 512. The stator core 511 is formed by joining multiple segmented cores 511a that are divided in its circumferential direction. Specifically, each segmented core 511a has straight slots and bosses extending along the motor axis. When multiple segmented cores 511a are assembled into the stator core 511, the straight slot on each segmented core 511a forms a snap-fit ​​structure with the boss of the adjacent segmented core 511a to limit the stator core 511 in a plane perpendicular to the motor axis. The principle of this limiting is similar to that of the brushless motor in the previous embodiment and will not be repeated here.

[0094] See Figure 14 As shown, the coil winding 513 is wound on the stator core 511 through the insulating member 512. The coil winding 513 on the segmented core 511a is wound onto the stator teeth along the direction of their extension, forming the first layer of winding. This winding pattern is repeated to form the second layer of winding, and so on until the last layer of winding. Since the width of the stator teeth is basically the same in their extension direction, the space between adjacent stator teeth for placing the coil winding 513 gradually decreases in the direction of the stator teeth's extension. Therefore, the last layer of winding wound on the stator teeth has the shortest length along the direction of the stator teeth's extension. It can be understood that the lengths of the first layer of winding, the second layer of winding, and so on until the last layer of winding, gradually decrease along the direction of the stator teeth's extension.

[0095] In this embodiment, the cross-section of the coil winding 513 is non-circular. Specifically, the cross-section of the coil winding 513 can be set as a rectangle, an ellipse, a gradient shape, or a combination thereof. In this embodiment, the cross-section of the coil winding 513 is rectangular, and the cross-sectional area of ​​the coil winding 513, i.e., the rectangular area, is set to be less than or equal to 5 mm². 2 In some embodiments, the cross-sectional area of ​​the coil winding 513 is set to be less than or equal to 3 mm². 2 .

[0096] See Figure 15As shown, the electric drill 100 also includes a drive circuit 50 and a control module 60 for controlling and driving the brushless motor 40. Driven by the drive signal output from the control module 60, the drive circuit 50 distributes voltage to each phase winding of the stator 41 of the brushless motor 40 according to a certain logical relationship, so that the brushless motor 40 starts and generates continuous torque. Specifically, the drive circuit 50 includes multiple electronic switches. In some embodiments, the electronic switches include field-effect transistors; in other embodiments, the electronic switches include insulated-gate bipolar transistors, etc. In some embodiments, the drive circuit 50 is a three-phase bridge circuit. The drive circuit 50 includes three electronic switches Q1, Q3, and Q5 configured as high-side switches and three electronic switches Q2, Q4, and Q6 configured as low-side switches. The drive circuit 50 drives the brushless motor 40 to rotate by switching the energizing state of each phase winding of the brushless motor 40 and controlling the energizing current of each phase winding. The conduction sequence and timing of each phase winding depend on the position of the rotor 42 of the brushless motor 40. In order to make the brushless motor 40 rotate, the drive circuit 50 has multiple drive states. In one drive state, the stator winding of the brushless motor 40 generates a magnetic field. The control module 60 outputs control signals based on different rotor positions to control the drive circuit 50 to switch drive states so that the magnetic field generated by the stator winding rotates to drive the rotor to rotate, thereby realizing the drive of the brushless motor 40.

[0097] In some embodiments, the output power of the brushless motor 40 employing the above technical solutions ranges from 120W to 3000W. In some embodiments, the output power of the brushless motor 40 ranges from 120W to 500W. In some embodiments, the output power of the brushless motor 40 ranges from 500W to 1500W. In some embodiments, the output power of the brushless motor 40 ranges from 1500W to 2000W. In some embodiments, the output power of the brushless motor 40 ranges from 2000W to 2500W. In some embodiments, the output power of the brushless motor 40 ranges from 2500W to 3000W.

[0098] In some embodiments, the speed range of the brushless motor 40 employing the above technical solutions is 15,000 rpm to 60,000 rpm. In some embodiments, the speed range of the brushless motor 40 is 15,000 rpm to 20,000 rpm. In some embodiments, the speed range of the brushless motor 40 is 20,000 rpm to 30,000 rpm. In some embodiments, the speed range of the brushless motor 40 is 30,000 rpm to 40,000 rpm. In some embodiments, the speed range of the brushless motor 40 is 40,000 rpm to 60,000 rpm.

[0099] In some embodiments, the output torque of the brushless motor 40 employing the above technical solutions ranges from 0.1 N·m to 8 N·m. In some embodiments, the output torque of the brushless motor 40 ranges from 0.1 N·m to 3 N·m. In some embodiments, the output torque of the brushless motor 40 ranges from 3 N·m to 5 N·m. In some embodiments, the output torque of the brushless motor 40 ranges from 5 N·m to 8 N·m.

[0100] In the above-described technical solution of this application, a brushless motor with a non-circular coil winding cross-section is used. Compared with traditional motors with circular coil winding cross-sections, this results in a higher slot fill factor, allowing for a larger occupied area in the high-efficiency region of the brushless motor. Next, we take two brushless motors of the same volume as examples. One brushless motor is designated as a conventional motor, i.e., with a circular coil winding cross-section, referred to simply as a round wire motor. The other brushless motor is designated as the brushless motor proposed in this application, with a rectangular coil winding cross-section. The inner diameter of the copper wire in the coil winding of the round wire motor is set to 0.75mm. The width of the copper wire in the coil winding of the flat wire motor is 1.4mm, and the thickness is 0.5mm. Furthermore, the number of turns of the coil windings on the stator core is the same for both. Table 1 shows a comparison of the effects of the round wire motor and the flat wire motor.

[0101] Table 1 Test Results of Round Wire Motors and Flat Wire Motors

[0102]

[0103] As shown in Table 1, compared with round wire motors of the same specifications, flat wire motors use rectangular coil windings, which reduces the gap between coils and increases the contact area. This results in better thermal conductivity between the coil windings of the flat wire motor, effectively suppressing the temperature rise of the motor.

[0104] On the other hand, the test results show that, compared with the same specifications of flat wire motors and round wire motors, the slot fill factor of flat wire motors is significantly improved, resulting in lower power consumption and higher working efficiency.

[0105] In this embodiment, the high-efficiency region of the brushless motor with a rectangular coil winding cross-section accounts for more than or equal to 20%. The high-efficiency region of the brushless motor is defined as the area with a motor efficiency greater than or equal to 80%.

[0106] Figure 16 and Figure 17Efficiency maps for round wire motors and flat wire motors are shown separately. The specifications of the round wire and flat wire motors are basically the same. Taking a round wire motor with a stator lamination outer diameter of 48mm and a stator core stack length of 20mm as an example, the area of ​​the high-efficiency zone of the flat wire motor is significantly larger than that of the round wire motor. During the experiment, the ratio of the area of ​​the high-efficiency zone (above 83%) of the flat wire motor to that of the round wire motor was greater than or equal to 7. This means that the high-efficiency zone of the flat wire motor is 7 times higher than that of the round wire motor. Therefore, the flat wire motor has a larger high-efficiency zone than the round wire motor, and thus, applying the flat wire motor proposed in this application to power tools can improve the working efficiency of the power tools.

[0107] The above embodiments have detailed the application of non-circular cross-section coil windings in brushless motors and the application of these brushless motors in power tools to improve the overall working efficiency of the power tools. On one hand, by setting the cross-section of the brushless motor's coil windings to be non-circular, the gaps between coils are reduced and the contact area is increased, resulting in better thermal conductivity and effectively suppressing temperature rise. On the other hand, the brushless motor in this application has a higher slot fill factor, thus increasing the proportion of the high-efficiency region of the motor's efficiency. When applied to power tools, this improves the overall working efficiency of the machine.

[0108] In fact, the technical solution for brushless motors in this application can also be applied to other types of power tools. Figure 18 A second embodiment of the power tool of this application is shown. This power tool is a table saw, specifically a table saw 200. The table saw 200 includes a worktable 210 having a working surface 211 for placing a workpiece. Specifically, the working surface 211 is the upper surface of the worktable 210 for a user to perform cutting operations. A hole is formed in the working surface 211. The table saw 200 also includes a saw blade 220 for cutting the workpiece. The saw blade 220 passes through the hole and extends. The table saw 200 also includes a motor for providing power, the saw blade 220 being driven to rotate by the motor located below the working surface 211 to achieve the cutting function. The saw blade 220 is used to cut workpieces, such as wood, that are pushed along the working surface 211 and come into contact with the saw blade 220. Specifically, the motor is preferably configured as a brushless motor. In some embodiments, the table saw 200 also includes a power supply unit (not shown), electrically connected to the table saw 200 to provide power to the table saw 200. The power supply unit may be a battery pack or a mains connector. In this embodiment, the power supply is preferably configured as a battery pack, which is detachably connected to the table saw 200. Specifically, the rated output voltage of the battery pack is greater than or equal to 18V.

[0109] The motor in this embodiment has a similar structure to the brushless motor in the first embodiment, and will not be described again here. It should be noted that the cross-section of the brushless motor's coil winding is rectangular, and the cross-sectional area of ​​the coil winding, i.e., the rectangular area, is set to be less than or equal to 5 mm². 2 In some embodiments, the cross-sectional area of ​​the coil winding is set to be less than or equal to 3 mm². 2 .

[0110] Specifically, the stator core stack length of the brushless motor is greater than or equal to 30 mm and less than or equal to 120 mm. In some embodiments, the stator core stack length is greater than or equal to 30 mm and less than or equal to 50 mm. In some embodiments, the stator core stack length is greater than or equal to 50 mm and less than or equal to 70 mm. In some embodiments, the stator core stack length is greater than or equal to 70 mm and less than or equal to 90 mm. In some embodiments, the stator core stack length is greater than or equal to 90 mm and less than or equal to 120 mm. The outer diameter of the stator lamination is greater than or equal to 40 mm and less than or equal to 120 mm. In some embodiments, the outer diameter of the stator lamination is greater than or equal to 40 mm and less than or equal to 60 mm. In some embodiments, the outer diameter of the stator lamination is greater than or equal to 60 mm and less than or equal to 80 mm. In some embodiments, the outer diameter of the stator lamination is greater than or equal to 80 mm and less than or equal to 100 mm. In some embodiments, the outer diameter of the stator lamination is greater than or equal to 100 mm and less than or equal to 120 mm. The inner diameter of the stator lamination is greater than or equal to 20 mm and less than or equal to 70 mm. In some embodiments, the inner diameter of the stator lamination is greater than or equal to 20 mm and less than or equal to 40 mm. In some embodiments, the inner diameter of the stator lamination is greater than or equal to 40 mm and less than or equal to 70 mm.

[0111] Specifically, the output power of the brushless motor employing the above technical solutions ranges from 500W to 5000W. In some embodiments, the output power of the brushless motor ranges from 500W to 1500W. In some embodiments, the output power of the brushless motor ranges from 1500W to 3000W. In some embodiments, the output power of the brushless motor ranges from 3000W to 5000W. In some embodiments, the speed range of the brushless motor is from 15000rpm to 60000rpm. In some embodiments, the speed range of the brushless motor is from 15000rpm to 20000rpm. In some embodiments, the speed range of the brushless motor is from 20000rpm to 30000rpm. In some embodiments, the speed range of the brushless motor is from 30000rpm to 40000rpm. In some embodiments, the speed range of the brushless motor is from 40000rpm to 60000rpm. In some embodiments, the output torque of the brushless motor ranges from 0.5N·m to 10N·m. In some embodiments, the output torque of the brushless motor ranges from 0.5N·m to 2N·m. In some embodiments, the output torque of the brushless motor ranges from 2 N·m to 5 N·m. In some embodiments, the output torque of the brushless motor ranges from 5 N·m to 8 N·m. In some embodiments, the output torque of the brushless motor ranges from 8 N·m to 10 N·m.

[0112] In this embodiment, the proportion of the high-efficiency zone of the brushless motor using the above technical solution is greater than or equal to 20%. The high-efficiency zone of the brushless motor is set as the region with a motor efficiency greater than or equal to 80%.

[0113] In fact, the technical solution for brushless motors in this application can also be applied to other types of power tools. Figure 19 A third embodiment of the power tool of this application is shown. The power tool is an outdoor tool, specifically a ride-on lawnmower 300. Specifically, the ride-on lawnmower 300 includes: a frame 311, a seat 312, a power output assembly 313, a walking assembly 314, an operating device 315, and a power supply device 316.

[0114] A frame 311 is used to support a seat 312, and the frame 311 extends at least partially in a direction parallel to the front and rear. The seat 312 is used for an operator to sit on, and the seat 312 is mounted on the frame 311.

[0115] The power output assembly 313 includes a first motor for driving the mowing element to rotate at high speed and a second motor for driving the walking assembly 314 to move. The power supply unit 316 provides power to the first motor, the second motor, and other electronic components on the ride-on lawnmower 300.

[0116] In some embodiments, the power supply 316 is located behind the seat 312 on the frame 311. In some embodiments, the power supply 316 includes a plurality of battery packs for powering power tools. In this embodiment, the rated output voltage of the battery packs is preferably set to be greater than or equal to 18V.

[0117] The operating device 15 is used by the operator to control the movement of the riding lawnmower 300 and / or determine whether the riding lawnmower 300 is in working condition.

[0118] In this embodiment, the first or second motor is preferably a brushless motor, and its structure is similar to that of the brushless motor in the first embodiment, so it will not be described again here. It should be noted that the cross-section of the coil winding of the brushless motor in this embodiment is rectangular, and the cross-sectional area of ​​the coil winding, i.e., the rectangular area, is set to be less than or equal to 5 mm². 2 In some embodiments, the cross-sectional area of ​​the coil winding is set to be less than or equal to 3 mm². 2 .

[0119] Specifically, the stator core stack length of the brushless motor is greater than or equal to 10 mm and less than or equal to 100 mm. In some embodiments, the stator core stack length is greater than or equal to 10 mm and less than or equal to 30 mm. In some embodiments, the stator core stack length is greater than or equal to 30 mm and less than or equal to 50 mm. In some embodiments, the stator core stack length is greater than or equal to 50 mm and less than or equal to 70 mm. In some embodiments, the stator core stack length is greater than or equal to 70 mm and less than or equal to 100 mm. The outer diameter of the stator lamination is greater than or equal to 30 mm and less than or equal to 120 mm. In some embodiments, the outer diameter of the stator lamination is greater than or equal to 30 mm and less than or equal to 60 mm. In some embodiments, the outer diameter of the stator lamination is greater than or equal to 60 mm and less than or equal to 80 mm. In some embodiments, the outer diameter of the stator lamination is greater than or equal to 80 mm and less than or equal to 100 mm. In some embodiments, the outer diameter of the stator lamination is greater than or equal to 100 mm and less than or equal to 120 mm. The inner diameter of the stator lamination is greater than or equal to 10 mm and less than or equal to 110 mm. In some embodiments, the inner diameter of the stator lamination is greater than or equal to 10 mm and less than or equal to 40 mm. In some embodiments, the inner diameter of the stator lamination is greater than or equal to 40 mm and less than or equal to 70 mm. In some embodiments, the inner diameter of the stator lamination is greater than or equal to 70 mm and less than or equal to 110 mm.

[0120] Specifically, the output power of the brushless motor employing the above technical solutions ranges from 500W to 5000W. In some embodiments, the output power of the brushless motor ranges from 500W to 1500W. In some embodiments, the output power of the brushless motor ranges from 1500W to 3000W. In some embodiments, the output power of the brushless motor ranges from 3000W to 5000W. In some embodiments, the speed range of the brushless motor is from 15000rpm to 60000rpm. In some embodiments, the speed range of the brushless motor is from 2000rpm to 100000rpm. In some embodiments, the speed range of the brushless motor is from 20000rpm to 40000rpm. In some embodiments, the speed range of the brushless motor is from 40000rpm to 60000rpm. In some embodiments, the speed range of the brushless motor is from 60000rpm to 80000rpm. In some embodiments, the speed range of the brushless motor is from 80000rpm to 100000rpm. In some embodiments, the output torque of the brushless motor ranges from 0.2 N·m to 20 N·m. In some embodiments, the output torque of the brushless motor ranges from 0.2 N·m to 5 N·m. In some embodiments, the output torque of the brushless motor ranges from 5 N·m to 15 N·m. In some embodiments, the output torque of the brushless motor ranges from 15 N·m to 20 N·m.

[0121] Thus, the high-efficiency region of the brushless motor using the above technical solution accounts for a proportion greater than or equal to 20%. Specifically, the high-efficiency region of the brushless motor is defined as the area where the motor efficiency is greater than or equal to 80%.

[0122] The foregoing has shown and described the basic principles, main features, and advantages of this application. Those skilled in the art should understand that the above embodiments do not limit this application in any way, and all technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of this application.

Claims

1. A handheld power tool, comprising: The housing has a gripping part for the user to hold; A motor, disposed within the housing, is used to drive functional accessories to realize the function of the handheld power tool; the motor has an output power greater than or equal to 120W and less than or equal to 4500W; The motor includes at least a stator, a rotor, and a plurality of coil windings disposed on the stator; in, The cross-section of the coil winding is non-circular, and the slot fill factor of the motor is greater than or equal to 40%. The motor also includes a printed circuit board on which conductive components are arranged to realize the electrical connection of the coil winding.

2. The handheld power tool according to claim 1, wherein, The stator includes a stator core formed by stacking multiple stator laminations and an insulating component disposed on the stator core; the coil winding is wound on the insulating component.

3. The handheld power tool according to claim 2, wherein, The outer diameter of the stator lamination is greater than or equal to 30 mm and less than or equal to 100 mm; the inner diameter of the stator lamination is greater than or equal to 10 mm and less than or equal to 60 mm.

4. The handheld power tool according to claim 2, wherein, The stack length of the stator core is greater than or equal to 5 mm and less than or equal to 80 mm.

5. The handheld power tool according to claim 2, wherein, The stator core is formed by joining together a plurality of segmented cores that are divided in the circumferential direction.

6. The handheld power tool according to claim 1, wherein, The cross-section of the coil winding includes rectangular, elliptical, and gradient shapes.

7. The handheld power tool according to claim 6, wherein, The cross-sectional area of ​​the coil winding is set to be less than or equal to 5 mm². 2 .

8. The handheld power tool according to claim 1, wherein, The motor has a rotational speed greater than or equal to 15,000 rpm and less than or equal to 60,000 rpm.

9. The handheld power tool according to claim 1, wherein, The output torque of the motor is greater than or equal to 0.1 N·m and less than or equal to 8 N·m.

10. The handheld power tool according to claim 1, wherein, The proportion of the high-efficiency zone in the motor efficiency is greater than or equal to 20%, and the high-efficiency zone is set as the area where the motor efficiency is greater than or equal to 80%.

11. The handheld power tool according to claim 1, wherein, The handheld power tool also includes a battery pack detachably connected to the housing, the battery pack having a rated output voltage greater than or equal to 12V.

12. A table-shaped tool, comprising: The worktable has a working surface for placing workpieces; The saw blade acts on the workpiece; A motor drives the saw blade to rotate; the motor includes at least a stator, a rotor, and a plurality of coil windings disposed on the stator; the output power of the motor is greater than or equal to 500W and less than or equal to 5000W. in, The cross-section of the coil winding is non-circular, and the slot fill factor of the motor is greater than or equal to 40%. The motor also includes a printed circuit board on which conductive components are arranged to realize the electrical connection of the coil winding.

13. The table-type tool according to claim 12, wherein, The stator includes a stator core formed by stacking multiple stator laminations and insulating components disposed on the stator core; The coil winding is wound on the insulating member.

14. The table-type tool according to claim 13, wherein, The outer diameter of the stator lamination is greater than or equal to 40 mm and less than or equal to 120 mm; the inner diameter of the stator lamination is greater than or equal to 20 mm and less than or equal to 70 mm.

15. The table-type tool according to claim 13, wherein, The stack length of the stator core is greater than or equal to 30 mm and less than or equal to 120 mm.

16. The table-type tool according to claim 13, wherein, The stator core is formed by joining together a plurality of segmented cores that are divided in the circumferential direction.

17. The table-type tool according to claim 12, wherein, The cross-section of the coil winding includes rectangular, elliptical, and gradient shapes.

18. The table-type tool according to claim 12, wherein, The cross-sectional area of ​​the coil winding is set to be less than or equal to 5 mm². 2 .

19. The table-type tool according to claim 12, wherein, The motor has a rotational speed greater than or equal to 15,000 rpm and less than or equal to 60,000 rpm.

20. The table-type tool according to claim 12, wherein, The output torque of the motor is greater than or equal to 0.5 N·m and less than or equal to 10 N·m.

21. The table-type tool according to claim 12, wherein, The proportion of the high-efficiency zone in the motor efficiency is greater than or equal to 20%; the high-efficiency zone is set as the area where the motor efficiency is greater than or equal to 80%.

22. The table-type tool according to claim 12, wherein, The motor is a brushless motor, which is driven by a drive circuit.

23. The table-type tool according to claim 12, wherein, The benchtop tool also includes a battery pack that provides power, the battery pack having a rated output voltage greater than or equal to 18V.

24. An outdoor tool, comprising: chassis, The power output assembly includes at least one motor; Operating device for use by the operator to control the outdoor tool; The motor's output power is greater than or equal to 500W and less than or equal to 5000W; The motor includes at least a stator, a rotor, and a plurality of coil windings disposed on the stator; in, The cross-section of the coil winding is non-circular, and the slot fill factor of the motor is greater than or equal to 40%. The motor also includes a printed circuit board on which conductive components are arranged to realize the electrical connection of the coil winding.

25. The outdoor tool according to claim 24, wherein, The stator includes a stator core formed by stacking multiple stator laminations and an insulating component disposed on the stator core; the coil winding is wound on the insulating component.

26. The outdoor tool according to claim 25, wherein, The outer diameter of the stator lamination is greater than or equal to 30 mm; the inner diameter of the stator lamination is greater than or equal to 10 mm.

27. The outdoor tool according to claim 25, wherein, The stack length of the stator core is greater than or equal to 10 mm and less than or equal to 100 mm.

28. The outdoor tool according to claim 25, wherein, The stator core is formed by joining together a plurality of segmented cores that are divided in the circumferential direction.

29. The outdoor tool according to claim 24, wherein, The cross-section of the coil winding includes rectangular, elliptical, and gradient shapes.

30. The outdoor tool according to claim 24, wherein, The cross-sectional area of ​​the coil winding is set to be less than or equal to 5 mm². 2 .

31. The outdoor tool according to claim 24, wherein, The motor has a rotational speed greater than or equal to 2000 rpm and less than or equal to 100000 rpm.

32. The outdoor tool according to claim 24, wherein, The output torque of the motor is greater than or equal to 0.2 N·m and less than or equal to 20 N·m.

33. The outdoor tool according to claim 24, wherein, The proportion of the high-efficiency zone in the motor efficiency is greater than or equal to 20%; the high-efficiency zone is set as the area where the motor efficiency is greater than or equal to 80%.

34. The outdoor tool according to claim 24, wherein, The motor is a brushless motor, which is driven by a drive circuit.

35. The outdoor tool according to claim 24, wherein, The outdoor tool also includes a battery pack with a rated output voltage greater than or equal to 18V.

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