Electric tool

Abstract

The utility model discloses an electric tool which comprises a motor assembly comprising a plurality of motors with driving shafts; at least part of torque of the driving shaft is output through the output shaft; the controller is used for controlling the operation of the motor assembly; the electric tool has different working modes; and the mode switching switch is connected with the controller and is operated to send a signal for switching the working mode into the self-adaptive mode or a signal for switching the working mode into the first working mode to the controller. The circular saw is multiple in use working conditions and convenient to operate.

Description

TECHNICAL FIELD

[0001] The present application relates to a power tool, in particular to a power tool with multiple motors. BACKGROUND

[0002] In the related art, a circular saw is usually used for a user to cut wood, plastic, etc. In order to make the circular saw can be in light load working condition and heavy load working condition, the motor assembly can be high efficiency output, two or more motors are used to drive the output shaft to output work. In order to ensure that the motor can be high efficiency output in different working conditions, the power tool with multiple motors uses parameter identification to adaptively switch one motor to run or multiple motors to run at the same time.

[0003] This part provides background information related to the present application, which may not be prior art. CONTENT OF THE UTILITY MODEL

[0004] One object of the present application is to solve or at least alleviate part or all of the above problems. To this end, one object of the present application is to provide a power tool with multiple working modes.

[0005] In order to achieve the above object, the present application adopts the following technical solution:

[0006] A power tool, comprising: an output shaft configured to output torque; the output shaft rotates around an output shaft axis; a motor assembly comprising multiple motors with drive shafts; at least part of the drive shafts are connected to the output shaft, and the torque of at least part of the drive shafts is output through the output shaft; a power supply provides operating power for the motor assembly; the power supply is connected to the motor assembly; a controller controls the operation of the motor assembly; the power tool includes different working modes, and the working modes include: an adaptive mode, the controller receives the output signal of the detector and sends a control signal to the motor assembly to switch the motor assembly to one or part of the multiple motors in the motor assembly being drivenly connected, or to all the multiple motors being jointly drivenly connected; a first working mode, the controller sends a signal to the motor assembly to make all the multiple motors of the motor assembly be jointly drivenly connected; a mode switching switch is connected to the controller and is operated to send a signal to the controller to switch the working mode to the adaptive mode or to switch the working mode to the first working mode. In some embodiments, it further comprises: a start switch connected to the power supply, the start switch is operated to energize the motor assembly; the start switch and the mode switching switch are different switch elements.

[0007] In some embodiments, it comprises: a main machine housing comprising at least accommodating the motor assembly; a bottom plate movably connected to the main machine housing; the bottom plate forms a bottom plate bottom surface in contact with a workpiece; the mode switching switch is arranged on the outer wall surface of the main machine housing.

[0008] In some embodiments, the main housing comprises: a holding portion located at the rear end of the power tool, which is held by a user to operate the power tool to perform a cutting action; a receiving housing configured to receive the first motor and the second motor; a connecting portion for connecting the holding portion and the receiving housing; wherein the start switch is located on the holding portion, and the mode switching switch is located on the connecting portion or the receiving housing.

[0009] In some embodiments, the power supply comprises a battery pack, which is arranged between the motor assembly and the holding portion for gripping, and the main housing is provided with a semi-open battery accommodation bin formed by inwardly recessing.

[0010] In some embodiments, further comprising: a control circuit board comprising a controller configured to control the motor assembly; and the control circuit board is at least partially arranged below the battery pack.

[0011] In some embodiments, further comprising: a control circuit board comprising a controller configured to control the motor assembly; and the control circuit board is at least partially arranged in the holding portion.

[0012] In some embodiments, the control circuit board is provided in plurality, and at least part of the control circuit boards are arranged in the housing at one end of the motor.

[0013] In some embodiments, further comprising: a control circuit board comprising a controller configured to control the motor assembly; and the control circuit board is at least partially arranged between the motor assembly and the battery pack.

[0014] In some embodiments, the motor assembly comprises at least a first motor and a second motor; the first motor comprises a first drive shaft rotating around a first axis; the second motor comprises a second drive shaft rotating around a second axis; the first drive shaft and the second drive shaft are arranged along the radial direction of the first drive shaft and intersect or are perpendicular to each other.

[0015] In some embodiments, the motor assembly comprises at least a first motor and a second motor; the first motor comprises a first drive shaft rotating around a first axis; the second motor comprises a second drive shaft rotating around a second axis; the torque of the first drive shaft and the second drive shaft is output through an output shaft, and the motor assembly further comprises a third motor for providing power to components other than the output shaft.

[0016] In some embodiments, further comprising a dust collection fan, and the third motor drives the dust collection fan to rotate to generate suction.

[0017] In some embodiments, further comprising an auxiliary cooling fan, and the third motor drives the auxiliary cooling fan to rotate to generate cooling air for the motor assembly and / or the controller.

[0018] The electric tool of the present application is provided with the adaptive mode and the first working mode, and different working modes can be switched in different working conditions and different requirements, so that the electric tool with the first motor and the second motor has higher performance and more intelligent switching, and the cutting capacity can also be ensured according to requirements, the electric tool is adapted to more working conditions and use scenarios, and the electric tool is switched between the adaptive mode and the first working mode at least in the manual mode, so that the user can actively switch the working mode according to use habits and specific use requirements, and the operation feeling of the user is stronger compared with automatic working mode switching by electronic identification. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a perspective view of a circular saw according to an embodiment of the present application;

[0020] Figure 2 is a structure view of the circular saw according to an embodiment of the present application from another perspective, in which relevant components of the motor assembly are shown;

[0021] Figure 3 is a sectional view of the first motor in the motor assembly according to the present application;

[0022] Figure 4 is a schematic view of the structure of the motor assembly, the power transmission mechanism and the output shaft of the circular saw according to an embodiment of the present application;

[0023] Figure 5 is a schematic view of a semi-sectional view of part of the mechanism of the circular saw according to an embodiment of the present application;

[0024] Figure 6 is a schematic view of the internal structure of the circular saw according to an embodiment of the present application;

[0025] Figure 7 is a schematic view of the electrical structure according to an embodiment of the present application;

[0026] Figure 8 is another electrical connection block diagram according to an embodiment of the present application;

[0027] Figure 9 is a control flowchart according to an embodiment of the present application, in which the electric tool switches the working mode through the manual mode;

[0028] Figure 10 is another electrical connection block diagram according to an embodiment of the present application;

[0029] Figure 11 is a control flowchart according to an embodiment of the present application;

[0030] Figure 12is a control flow chart of an embodiment of the present application, in which the power tool switches the working mode by electronic identification, and detects the physical quantity related to the battery pack operation;

[0031] Figure 13 is a control flow chart of an embodiment of the present application, in which the controller determines whether to respond to the working mode configuration signal of the power tool based on the physical quantity related to the battery pack operation state;

[0032] Figure 14 is a control method flow chart of the power tool in the adaptive mode of an embodiment of the present application;

[0033] Figure 15 is a third electrical connection block diagram of an embodiment of the present application;

[0034] Figure 16 is a control flow chart of an embodiment of the present application, in which the power tool switches the working mode by electronic identification;

[0035] Figure 17 is a control method flow chart of the first motor and the second motor of the power tool of an embodiment of the present application;

[0036] Figure 18 is a control method flow chart of the first motor and the second motor of the power tool of another embodiment of the present application;

[0037] Figure 19a is a fourth electrical connection block diagram of an embodiment of the present application;

[0038] Figure 19b is a fifth electrical connection block diagram of an embodiment of the present application;

[0039] Figure 20 is a perspective structural diagram of a circular saw of an embodiment of the present application, in which a first arrangement position of a mode switching switch is shown;

[0040] Figure 21 is a perspective structural diagram of a circular saw of an embodiment of the present application, in which a second arrangement position of a mode switching switch is shown;

[0041] Figure 22 is a perspective structural diagram of a circular saw of an embodiment of the present application, in which a third arrangement position of a mode switching switch is shown;

[0042] Figure 23 is a perspective structural diagram of a circular saw of an embodiment of the present application, in which a fourth arrangement position of a mode switching switch is shown;

[0043] Figure 24is a schematic view of the internal structure of a circular saw according to an embodiment of the present application, in which a second arrangement position of a control circuit board is shown;

[0044] Figure 25 is a schematic view of the internal structure of a circular saw according to an embodiment of the present application, in which a third arrangement position of a control circuit board and a second arrangement position of a motor assembly are shown;

[0045] Figure 26 is a schematic view of the internal structure of a circular saw according to an embodiment of the present application, in which a third arrangement position of a control circuit board is shown;

[0046] Figure 27 is a schematic view of the structure of a motor assembly, a power transmission mechanism and an output shaft of a circular saw according to an embodiment of the present application, in which a second arrangement position of the above-mentioned components is shown;

[0047] Figure 28 is a schematic view of the structure of a motor assembly, a power transmission mechanism and an output shaft of a circular saw according to an embodiment of the present application, in which a third arrangement position of the above-mentioned components is shown;

[0048] Figure 29 is a schematic view of another perspective of Figure 28 ;

[0049] Figure 30 is a circular saw according to an embodiment of the present application, in which a motor assembly is provided with at least two motors;

[0050] Figure 31 is another circular saw according to an embodiment of the present application, in which a motor assembly is provided with at least two motors. DETAILED DESCRIPTION

[0051] Before any embodiments of the present application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the above-described accompanying drawings.

[0052] In the present application, the terms "comprise", "include", "have" or any other variant thereof are intended to cover non-exclusive inclusions, such that processes, methods, articles or apparatuses that comprise a list of elements are not limited to those elements, but can also include other elements not expressly listed or inherent to such processes, methods, articles or apparatuses. Without more limitations, the element defined by the phrase "comprising a" does not exclude the presence of additional identical elements in the process, method, article or apparatus that includes the element.

[0053] In the present application, the term "and / or", is a description of an associated relationship with an associated object, which means that there can be three kinds of relationships. For example, A and / or B, can represent: A exists alone, A and B exist together, B exists alone, these three cases. In addition, the character " / " in the present application generally indicates that the front and rear associated objects are in a "and / or" relationship.

[0054] In the present application, the terms "connected", "combined", "coupled", "mounted" can be direct connection, combination, coupling or mounting, or indirect connection, combination, coupling or mounting. Among them, for example, direct connection refers to the connection of two parts or components without the need for an intermediate part, and indirect connection refers to the connection of two parts or components with at least one intermediate part. These two parts or components are connected through the intermediate part. In addition, "connection" and "coupling" are not limited to physical or mechanical connection or coupling, and can include electrical connection or coupling.

[0055] In the present application, those of ordinary skill in the art will understand that the relative terms used in connection with quantities or conditions (for example, "about", "approximately", "substantially" and the like) include the values described and have the meaning indicated by the context. For example, the relative terms at least include the degree of error related to the measurement of a specific value, the tolerance caused by manufacturing, assembly, use, etc. related to a specific value. Such terms should also be considered to disclose the range defined by the absolute values of the two endpoints. The relative term can refer to a certain percentage (for example, 1%, %, 1% or more) of the indicated value. The numerical value without the relative term should also be disclosed as a specific value with a tolerance. In addition, "substantially" when expressing the relative angular positional relationship (for example, substantially parallel, substantially perpendicular), can refer to a certain number of degrees (for example, 1 degree, degrees, 1 degree or more) added or subtracted from the indicated angle.

[0056] In the present application, those of ordinary skill in the art will understand that the functions performed by the components can be performed by one component, multiple components, one part, or multiple parts. Similarly, the functions performed by the parts can also be performed by one part, one component, or multiple parts in combination.

[0057] In the present application, the terms "upper", "lower", "left", "right", "front", "back" and the like are described in the orientation and positional relationship shown in the drawings, and should not be understood as limiting the embodiments of the present application. In addition, it is also understood in the context that when referring to an element connected to another element "on" or "under", it can be directly connected to another element "on" or "under", or indirectly connected to another element "on" or "under" through an intermediate element. It should also be understood that the terms "upper", "lower", "left", "right", "front", "back" and the like not only represent the positive direction, but also can be understood as the side direction. For example, the lower side can include the directly below, left below, right below, front below and back below, etc.

[0058] In the present application, the terms "controller", "processor", "central processing unit", "CPU", "MCU" can be interchangeable. When using the unit "controller", "processor", "central processing unit", "CPU" or "MCU" to perform a specific function, unless otherwise specified, these functions can be performed by a single unit or multiple units.

[0059] In the present application, the terms "device", "module" or "unit" can be realized by hardware or software to achieve a specific function.

[0060] In the present application, the terms "calculate", "judge", "control", "determine", "identify" and the like refer to the operation and process of a computer system or similar electronic computing device (e.g., controller, processor, etc.).

[0061] As Figure 1 An electric tool is shown in one embodiment of the present application. The electric tool includes a motor assembly 20. In the present embodiment, the electric tool is a circular saw 100. In some embodiments, the electric tool can also be other cutting tools, such as a table saw, a miter saw, a stone machine, a tile saw, a chain saw, etc.

[0062] In some embodiments, the power tool can also be a garden tool, such as a lawnmower, a blower, a walk-behind power tool such as a mower, a washer, etc. Alternatively, the power tool can also be a decoration tool, such as a screwdriver / drill / wrench, an electric hammer, a nail gun, a sander, etc. Alternatively, the power tool can also be a saw, such as a jigsaw, a curve saw, etc. Alternatively, the power tool can also be other bench tools, such as a wood router, etc. Alternatively, the power tool can also be a polishing tool, such as an angle grinder, a sander, etc. Alternatively, the power tool can also be other power tools, such as a fan, etc. Alternatively, the walking device can also be a non-road traveling walking device, such as an all-terrain vehicle (ATV), a utility terrain vehicle (UTV), a golf cart, a utility vehicle, a sand vehicle, a farm vehicle, such as a harvester, a pesticide spraying vehicle, etc. Of course, it can be understood that the walking device can also be a washer. It can also be an intelligent walking power tool driven by a motor or a motor assembly, such as an intelligent mower, etc.

[0063] It can be understood that any power tool with a motor drive can adopt the technical solution disclosed in the embodiment, and the power device adopting the technical solution disclosed in the embodiment belongs to the scope of protection of the present application. For example, the power tool can also be a power head including a motor. The power head is configured to adapt to some output assemblies to realize the function of the tool.

[0064] As shown in Figure 1 , a circular saw 100 is taken as an example. The circular saw 100 is a handheld circular saw. Unless otherwise specified, directional terms such as front, back, left, right, up and down are relative to the direction of normal use of the circular saw 100, such as defining the forward direction of the circular saw 100 as front and the direction opposite to the forward direction of the circular saw 100 as back.

[0065] As shown in Figures 1 to 2 , the circular saw 100 includes a power supply 31. In the embodiment, the power supply 31 is a direct current power supply. The direct current power supply provides power for the circular saw 100. The direct current power supply includes at least one battery pack configured to provide a power source for the motor assembly 20. The battery pack cooperates with a corresponding power supply circuit to supply power for the circular saw 100. It can be understood by those skilled in the art that the power supply is not limited to the scenario of using a direct current power supply, but can also be achieved by using a mains power supply, an alternating current power supply, cooperating with a corresponding rectification, filtering and voltage regulation circuit to supply power to the corresponding components in the machine. In the subsequent description, the battery pack 31 will be used instead of the power supply, but it cannot be regarded as a limitation of the present application.

[0066] The battery pack 31 may be a lithium battery pack, a solid-state battery pack, or a soft-pack battery pack. In some embodiments, when the power supply includes multiple battery packs 31, the battery packs 31 may be of the same or different types. In some embodiments, the electrical parameters, structural parameters, and physical parameters of the multiple battery packs 31 may be the same or different.

[0067] like Figures 1 to 6 As shown, the circular saw 100 further includes: an output shaft 30, a main body housing 11, a motor assembly 20, a power transmission mechanism 40 and a bottom plate 50. Figures 1 to 2 As shown, the output shaft 30 is configured to install a cutting member 61. The cutting member 61 rotates around the output axis 301. In this embodiment, the cutting member 61 is a circular saw blade. The motor assembly 20 is configured to drive the output shaft 30 to rotate. The power transmission mechanism 40 is configured to transmit the output power of the motor assembly 20 to the output shaft 30. The main housing 11 is configured to accommodate parts such as the motor assembly 20 and the power transmission mechanism 40, and the output shaft 30 and the cutting member 61 are arranged outside the main housing 11. The base plate 50 is movably connected to the main housing 11, and the base plate 50 is formed with a base plate bottom surface 51 that contacts the workpiece. The base plate 50 is formed with a saw blade through hole 54 extending along the first direction K1, and the saw blade can pass through the saw blade through hole 54 and protrude downward from the base plate bottom surface 51.

[0068] The main body housing 11 is formed with or connected to a gripping portion 12 for grasping. The gripping portion 12 is located at the rear end of the circular saw 100 and can be grasped by the user to operate the circular saw 100 to perform cutting. In some embodiments, a start switch 81 and a safety switch 82 are also provided on the gripping portion 12. The start switch 81 is connected to the power supply 31, and the start switch 81 is operated to energize the motor assembly 20. In this embodiment, the start switch 81 can only be triggered when the safety switch 82 is pressed. In other words, two actions must be performed before the motor or motor assembly 20 can be started. Thus, the dangers caused by a single operation are avoided. When the user grasps the gripping portion 12, the user's hand grasping the gripping portion 12 can trigger the safety switch 82 and the start switch 81 to start or shut down the circular saw 100.

[0069] In one embodiment, the main housing 11 may further include a second grip 13. The second grip 13 is located at the front end of the circular saw 100 and serves as an auxiliary handle. In one embodiment, the second grip 13 may also be an external handle mounted on the main housing 11, that is, a separate auxiliary operating component mounted on the main housing 11.

[0070] The circular saw 100 further comprises a shroud assembly 60. The shroud assembly 60 is capable of at least partially enclosing the cutting member 61 to protect the environment and the safety of the user. The shroud assembly 60 comprises a fixed shroud 62 in an arc shape, and a movable shroud 63 rotating relative to the fixed shroud 62. The fixed shroud 62 is connected to the main housing 11. The movable shroud 63 is sleeved in the fixed shroud 62, and is rotatable about the output axis 301 to be folded into the fixed shroud 62. The output shaft 30 extends into the fixed shroud 62, and the cutting member 61 is detachably connected to the output shaft 30. In actual work, different types of cutting members 61 can be used according to the material of the cutting object. The cutting member 61 is arranged in the fixed shroud 62, and almost half of the outer circumference of the cutting member 61 is covered by the fixed shroud 62. The movable shroud 63 rotates in the fixed shroud 62 to shield or expose the lower half of the cutting member 61. The movable shroud 63 and the fixed shroud 62 have an opening member 64 of the movable shroud 63. When the circular saw 100 is used, the operator manually pushes the opening member 64 to rotate the movable shroud 63 to expose part of the saw teeth.

[0071] The bottom plate 50 is movably connected to the fixed shroud 62. In this embodiment, a connecting seat 52 is arranged on the front side of the bottom plate 50, and a pin 53 is connected between the connecting seat 52 and the fixed shroud 62, so that the fixed shroud 62 is rotatable relative to the bottom plate 50. An axis defined by the pin 53 is a pivot axis 501. The pivot axis 501 is parallel to the output axis 301. When the fixed shroud 62 rotates about the pivot axis 501 relative to the bottom plate 50, the relative position between the fixed shroud 62 and the bottom plate 50 changes, thereby causing the circular saw 100 to have different cutting depths. The rotation of the fixed shroud 62 is achieved by applying a force on the holding portion 12 to rotate the holding portion 12 relative to the bottom plate 50, thereby rotating the fixed shroud 62 relative to the bottom plate 50. It can be understood that in some embodiments, the pivot axis 501 and the output axis 301 can intersect or be perpendicular.

[0072] As shown in Figures 2 to 5 The motor assembly 20 comprises a first motor 21 and a second motor 22. The first motor 21 comprises a first drive shaft 211 rotating about a first axis 201. The second motor 22 comprises a second drive shaft 221 rotating about a second axis 202. The first motor 21 and the second motor 22 each comprise a stator and a rotor. Taking the first motor 21 as an example, as shown in Figure 3 The stator 212 comprises a stator core 2121 and a stator winding 2122. The rotor 214 comprises a rotor core 2141 and a permanent magnet 2142. The rotor 214 is formed or connected with a drive shaft arranged to output power. For an outer rotor motor, the rotor is sleeved outside the stator. For an inner rotor motor, the stator is sleeved outside the rotor. In this embodiment, the overall structure of the motor is generally the same as that of a general brushless motor, and will not be described in detail here.

[0073] As Figure 4 and Figure 5 shown, the power transmission mechanism 40 is configured to transmit power of at least one of the first motor 21 and the second motor 22 to the output shaft 30. The torques of the first drive shaft 211 and the second drive shaft 221 are output through the output shaft 30. In the present embodiment, the first motor 21 and the second motor 22 work together to output the torque of the motor assembly 20 through the output shaft 30, and the torque is output externally through the output shaft 30. Taking the electric circular saw of the present application as an example, the first motor 21 and the second motor 22 work together to drive the cutting member 61 to perform cutting movement through the output shaft 30. Unlike the multi-motor driven power tools in the related art, such as outdoor walking devices or wheeled devices, which use multiple motors, for example, two motors, to drive different output shafts or output parts respectively. For example, in the related art, the first motor 21 and the second motor 22 are used to drive two or more drive wheels or drive shafts respectively. However, in the present embodiment, the motor assembly 20 including multiple motors is used to drive the same output shaft, that is, the torques of the drive shafts of multiple motors are output through one output shaft. The endpoints of the torque transmission paths of multiple motors are the same, which improves the working efficient range of the entire power tool, so that the power tool with only one output shaft can also be driven efficiently using multiple motors. Compared with multiple motors driving different output parts or output shafts, multiple motors are used to drive one output shaft in the present application, and the transmission matching, power distribution and driving structure of the motor assembly 20 and the power transmission mechanism 40 all need to overcome more difficulties.

[0074] When the power tool in the present application is a non-road walking device or an agricultural vehicle, the motor assembly 20 provides power for one output shaft. For example, when the motor assembly 20 is used as a walking drive, the motor assembly 20 drives one walking axle or walking wheel. When the motor assembly 20 is used as a drive for a functional part (such as a grass cutting blade), the motor assembly 20 drives a grass cutting blade on one output shaft. This needs to be distinguished from the multi-motor driving multiple output shafts or drive axles in the related art.

[0075] As Figure 7As shown, the circular saw 100 further comprises a control circuit including a controller 171 configured to control the operation of the motor assembly 20. The controller 171 is disposed on a control circuit board 18, which includes a PCB (Printed Circuit Board) and a FPC (Flexible Printed Circuit board). The controller 171 employs a dedicated control chip, for example, a single-chip microcomputer, a microcontroller unit (MCU). The controller 171 includes a processor configured to programmably control the respective corresponding functions and a memory configured to store the programs to be executed and related data. It should be noted that the control chip can be integrated into the controller 171, or can also be disposed independently of the controller 171. The structural relationship between the drive chip and the controller 171 is not limited in the present embodiment.

[0076] The control circuit further comprises a drive circuit 172 disposed between the power supply 31 and the motor assembly 20 and configured to drive the motor assembly 20. The drive circuit 172 includes a plurality of switching elements, for example, a three-phase bridge drive circuit of controllable semiconductor power devices (such as field effect transistors (FETs), bipolar junction transistors (BJTs), insulated gate bipolar transistors (IGBTs), etc.). It can be understood that the above-mentioned switching elements can also be any other type of solid-state switch, such as IGBT, BJT, etc. In the present embodiment, the drive circuit 172 includes a first drive circuit 1721 connected between the first motor 21 and the power supply 31 and a second drive circuit 1722 connected between the second motor 22 and the power supply 31.

[0077] The circular saw 100 includes switchable operating modes, and for the motor assembly 20 provided with the first motor 21 and the second motor 22, different operating modes have different operating parameters or switching parameters for the first motor 21 and the second motor 22 in the motor assembly 20.

[0078] In some embodiments, the circular saw 100 includes an adaptive mode and a first operating mode. In the adaptive mode, the controller 171 switches the operating state of the motor assembly 20 based on the identification result of the detector 173, and the operating state of the motor assembly 20 at least includes that the first motor 21 or the second motor 22 is driven, and the first motor 21 and the second motor 22 are jointly driven. In the first operating mode, the controller 171 causes the first motor 21 and the second motor 22 to be jointly driven in response to an input instruction.

[0079] In the adaptive mode, the controller 171 determines the working condition of the circular saw 100 and / or the load condition of the output shaft 30 according to the electronic identification mode, and then switches the single motor working or the double motor working according to the working condition of the circular saw 100 and / or the load condition of the output shaft 30, dynamically adjusts the driving parameters of the motor assembly 20 to make the output of the motor assembly 20 meet the actual working requirements of the circular saw 100, so that the motor assembly 20 adapts to the working condition of the power tool, the single motor and double motor running state switching is more intelligent, which can not only ensure that the motors in the motor assembly 20 are basically in their respective high-efficiency working intervals, but also ensure the intelligent switching of the single-pack use time of the power tool to save energy and be efficient.

[0080] In the first working mode, the first motor 21 and the second motor 22 are jointly driven, that is, when the controller 171 is input with a signal that the circular saw 100 enters the first working mode, the motor assembly 20 always maintains the double motor driving state that the first motor 21 and the second motor 22 are jointly driven, and only when the controller 171 is input with a signal that enters other working modes or the controller 171 is input with a signal that exits the first working mode, the motor assembly 20 will end the double motor driving state that the first motor 21 and the second motor 22 are jointly driven in the first working mode. Compared with the intelligent switching of the adaptive mode, when the user needs the power tool to work quickly and powerfully, such as cutting work, after entering the first working mode, no matter the actual working requirement or working condition, the controller 171 forcibly starts the first motor 21 and the second motor 22, so that the power tool provides powerful working torque and has high working capacity and efficiency.

[0081] The power tool of the present application is provided with the adaptive mode and the first working mode at the same time, and different working modes can be switched in different working conditions and different requirements, so that the power tool with the first motor 21 and the second motor 22 not only has higher performance and more intelligent switching when working, but also can ensure the cutting capacity according to the requirements, the power tool adapts to more working conditions and use scenarios, better meets the needs of users, and has better commercial value.

[0082] In some embodiments, to better expand the use scenarios, the working modes further include a second working mode, in which the controller 171 drives the first motor 21 and brakes the second motor 22 in response to the input instruction. That is, when the controller 171 is inputted with a signal to enter the second working mode of the circular saw 100, the first motor 21 in the motor assembly 20 is driven to operate, while the second motor 22 is braked to not output torque, and only the first motor 21 in the motor assembly 20 works in the single-motor driving state. Only when the controller 171 is inputted with a signal to enter another working mode or the controller 171 is inputted with a signal to exit the second working mode, the motor assembly 20 ends the single-motor driving state in which the first motor 21 is driven and the second motor 22 is braked in the second working mode. When the user needs to continuously use low output torque for special working conditions or other working conditions that only require single driving, the circular saw 100 enters the second working state, thereby providing suitable output torque and lower energy consumption. Further increase the use conditions of the power tool.

[0083] In some embodiments, the circular saw 100 includes an adaptive mode and a selected mode, in which the controller 171 drives the motor based on the input instruction corresponding to the selected mode determined according to the input instruction. That is, the selected mode provides one or more sets of motor working forms, when the controller 171 receives a set of input instructions, the set of input instructions corresponds to a set of motor working forms, for example, the first output instruction corresponds to only one motor working, and the second input instruction corresponds to two motor working. Only when the controller 171 is inputted with another set of different input instructions, a signal to enter another working mode or a signal to exit the current working mode, the motor assembly 20 ends using this motor working form. Exemplarily, the selected mode includes the first working mode described above and / or the second working mode described above. Exemplarily, the selected mode further includes other motor assembly 20 driving modes, for example, when the motor assembly 20 includes multiple motors, the selected mode further includes that part of the multiple motors are driven, for example, the motor assembly 20 includes the first motor 21, the second motor 22 and the third motor, the selected mode includes that only the first motor 21 is driven, the first motor 21 and the second motor 22 are driven, and all the motors are jointly driven.

[0084] In some embodiments, in the adaptive mode, the controller 171 can also dynamically adjust the operation state of the motor assembly 20 according to the identification result of the detector 173. For example, the controller 171 can selectively start one of the first motor 21 and the second motor 22 or start both the first motor 21 and the second motor 22 according to the identification result of the detector 173. For example, in the adaptive mode, the driving parameters of the first motor 21 and / or the second motor 22 are constant, the controller 171 can selectively start one of the first motor 21 and the second motor 22 or start both the first motor 21 and the second motor 22 according to the identification result of the detector 173, the controller 171 only switches the starting state of the first motor 21 and the second motor 22, but after the first motor 21 and the second motor 22 are started, the driving parameters of the first motor 21 and the second motor 22 are pre-set, for example, after the first motor 21 is started, the first motor 21 outputs the output torque at the highest efficiency point of the motor efficiency, and after the second motor 22 is started, the second motor 22 outputs the output torque at the highest efficiency point of the motor efficiency. It should be explained here that "motor efficiency" refers to the ratio of output power (mechanical) to input power (electric), which is generally expressed in percentage. For example, in the adaptive mode, the driving parameters of the first motor 21 and the second motor 22 are also dynamically adjusted, for example, the output torque of the first motor 21 and the second motor 22 is dynamically adjusted, and optionally, the output torque of the first motor 21 and the second motor 22 is dynamically adjusted so that the motor efficiency of the first motor 21 is greater than or equal to 70%, and the motor efficiency of the second motor 22 is greater than or equal to 70%. In some embodiments, the output speed of the first motor 21 and the second motor 22 is dynamically adjusted so that the output torque of the power tool meets the required torque for performing its function, and the output speed of the first motor 21 and / or the second motor 22 is adjusted in real time or at a certain time according to the size of the required torque. It can be understood that the current, voltage or other motor control related parameters of the motor can also be dynamically adjusted so that the output of the motor assembly meets the requirements for performing its function.

[0085] In the first working mode, the controller keeps the first motor 21 and the second motor 22 jointly driven. In the embodiment, when the first motor 21 and the second motor 22 are jointly driven, the operating states of the first motor 21 and the second motor 22 are dynamically adjusted, but the first motor 21 and the second motor 22 always output torque to the output shaft. For example, the output rotation speeds of the first motor 21 and the second motor 22 are dynamically adjusted to make the output torque of the power tool meet the required torque for performing the function, and the output rotation speed of the first motor 21 and / or the second motor 22 is adjusted in real time or at a certain time according to the size of the required torque. In some embodiments, the controller 171 drives the first motor 21 and the second motor 22 with a plurality of groups of preset driving parameters, for example, when the first working mode is used, the output shaft 30 is divided into different levels according to the load state, and the plurality of groups of preset driving parameters are switched according to the levels to make the first motor 21 and the second motor 22 have operating states suitable for different outputs. In some embodiments, the controller 171 drives the first motor 21 and the second motor 22 with a group of preset driving parameters, for example, the controller 171 drives the first motor 21 to output maximum torque, and the controller 171 drives the second motor 22 to output maximum torque. It can be understood that when the first working mode is used, the first motor 21 and the second motor 22 are respectively driven to output maximum torque, and the motor assembly 20 outputs maximum torque, and during the working of the circular saw 100 in the first working mode, the output torque of the first motor 21 is basically unchanged, and the output torque of the second motor 22 is basically unchanged. Optionally, when the power tool switches to the first working mode for working, the controller 171 drives the first motor 21 and the second motor 22 by using field-oriented control (FOC) to keep the first motor 21 and the second motor 22 jointly driven. For example, when the power tool switches to the adaptive mode for working, the controller 171 drives the first motor 21 and the second motor 22 by using square wave control. Optionally, when the power tool switches to the adaptive mode for working, the controller 171 drives the first motor 21 and the second motor 22 by using field-oriented control.

[0086] In the second working mode, the controller 171 drives the first motor 21 to work while braking the second motor 22. When the second motor 22 is in the braking state, the second driving circuit 1722 connected to the second motor 22 is in the non-conductive state, and the power supply 31 does not supply power to the second motor 22. When the power tool is in the second working mode, the power consumption of the motor assembly 20 is less. In some embodiments, the controller 170 dynamically adjusts the output speed of the first motor 21 to make the output torque of the power tool meet the required torque for performing its function, and adjusts the output speed of the first motor 21 in real time or at a certain time according to the size of the required torque. In some embodiments, the controller 171 drives the first motor 21 with a plurality of sets of preset driving parameters, for example, in the first working mode, according to different output shaft load states, switches between a plurality of sets of preset driving parameters according to a plurality of levels, so that the first motor 21 has running states suitable for different outputs. In some embodiments, the controller 171 drives the first motor 21 with a set of preset driving parameters, wherein the preset parameter types include one or more of motor speed, motor output torque, motor output current, or other motor operating parameters, and the specific values of the preset parameters are not limited according to different product requirements. Optionally, the preset parameter is the value corresponding to the condition that the output efficiency of the first motor 21 is greater than or equal to 70%. Optionally, the preset parameter is a specific value set according to product needs, such as low power consumption requirements and low noise requirements.

[0087] When only one motor is driven in the adaptive mode, the other motor is in standby state, for example, when the first motor 21 is driven, the second motor 22 is in standby state. When the second motor 22 is in standby state, the power supply 31 supplies power to the second motor 22 through the second driving circuit 1722, but the second driving shaft 221 does not output torque, that is, when the second motor 22 is in standby state, the second motor 22 is not offline, and the second driving circuit 1722 of the second motor 22 still receives the control signal of the controller 171. The second motor 22 is in a "zero" torque control state or a state with a duty cycle of zero. In some embodiments, the second motor is placed in standby state by directly cutting off the power supply of the second motor in a switch-on and switch-off manner.

[0088] For the switching mode of the power tool between different working modes, such as Figure 8As shown, in some embodiments, the power tool switches the working mode through a manual mode. For example, the power tool comprises a mode switching part 70 configured to receive a switching instruction input by a user and send a signal for executing the adaptive mode or the first working mode or the second working mode. The mode switching part 70 comprises a switching element, which is defined as a mode switching switch 71, and the mode switching part 70 is configured to receive the switching instruction input by the user. The mode switching switch 71 comprises at least one of a mechanical switch or an electronic switch. The mechanical switch comprises a push switch (button switch, key switch, membrane switch, cantilever switch, etc.), a toggle switch (gear switch, lever switch, rod switch, etc.), a rotary switch (knob switch, dial switch, etc.), a micro switch, etc. The electronic switch comprises a sensor and a chip, and according to different types of sensors, the electronic switch comprises a touch switch (capacitive, resistive), an inductive switch (infrared induction, microwave induction, ultrasonic induction, piezoelectric induction, electromagnetic induction, capacitive induction), a sound control switch, a wireless switch (connected with an external smart device), etc.

[0089] The user inputs the desired working mode, such as the first working mode, the second working mode and the adaptive working mode, through the mode switching part 70, and the mode switching part 70 outputs an input instruction corresponding to the switching instruction to the controller 171, and the controller 171 configures the corresponding working mode of the power tool. When the mode switching part 70 receives the switching instruction of the first working mode or the second working mode, the controller 171 determines that the motor assembly 20 enters the state corresponding to the first working mode or the second working mode in response to the signal output by the mode switching part 70.

[0090] As shown, a control method of a power tool, the power tool switches the working mode through a manual mode, and specifically comprises the following steps: Figure 9

[0091] S101: Start.

[0092] S102: The mode switching part 70 receives an input instruction for switching to the first working mode, if yes, execute S103, if no, return to S101.

[0093] S103: Enter the first working mode in response to the input instruction.

[0094] S104: The first motor and the second motor are jointly driven.

[0095] When the mode switching part 70 receives the switching instruction for switching to the first working mode, the controller 171 determines that the first motor and the second motor are jointly driven and keeps the state of the first motor and the second motor being jointly driven in response to the signal output by the mode switching part 70.

[0096] ​S112: The mode switching unit 70 receives an input instruction to switch to the adaptive mode, and if yes, S113 is executed, and if no, S101 is returned.

[0097] S113: The adaptive mode is entered in response to the input instruction.

[0098] S114: The detector performs preset parameter identification.

[0099] S115: It is determined whether the first motor or the second motor is driven, and if yes, S116 is executed. If no, S117 is executed.

[0100] S116: The first motor or the second motor is driven, and the other motor is on standby.

[0101] S117: The first motor and the second motor are jointly driven.

[0102] When the switching instruction received by the mode switching unit 70 is to switch to the adaptive mode, in the adaptive mode, the controller 171 can also determine the load of the power tool according to the identification result of the detector 173, and dynamically adjust the operating state of the first motor 21 and the second motor 22. When it is determined according to the detector that the first motor or the second motor is driven, the output of the motor assembly meets the load of the power tool, then the first motor or the second motor is driven, and the other motor is on standby. When it is determined according to the detector that the first motor or the second motor is driven, the output of the motor assembly cannot meet the load of the power tool, then the first motor and the second motor need to be jointly driven.

[0103] S122: The mode switching unit 70 receives an input instruction to switch to the second working mode, and if yes, S123 is executed, and if no, S101 is returned.

[0104] S123: The second working mode is entered in response to the input instruction.

[0105] S124: The first motor is driven and the second motor is braked.

[0106] When the switching instruction received by the mode switching unit 70 is to switch to the second working mode, the controller 171 controls the first motor to be driven and the second motor to be braked in response to the signal output by the mode switching unit 70, and the braking state of the second motor is always maintained.

[0107] In some embodiments, the power tool switches the working mode by electronic identification. As shown in Figure 10 and Figure 15 The controller 171 includes a mode selection module 174, and the mode selection module 174 automatically switches the working mode configured by the power tool according to the parameter identification result.

[0108] In some embodiments, the controller 171 determines the operating states of the first motor 21 and the second motor 22 based on the physical quantities related to the operating state of the battery pack 31. The control circuit includes a first detector 1731 configured to detect the physical quantities related to the operating state of the battery pack 31. Optionally, the physical quantities related to the operating state of the battery pack 31 include, but are not limited to, the voltage, the current, the temperature, the state of power (SOP), the state of charge (SOC), the internal resistance, and the model of the battery pack 31. Exemplarily, the physical quantities related to the operating state of the battery pack 31 include one or more of the above disclosed physical quantities in combination with time.

[0109] As shown in FIG. 1, a control method of an electric power tool includes the following steps: Figure 11

[0110] S201: detecting the physical quantities related to the operating state of the battery pack.

[0111] The first detector 1731 is configured to detect the physical quantities related to the operating state of the battery pack 31. The physical quantities related to the operating state of the battery pack 31 include, but are not limited to, the voltage, the current, the temperature, the state of power (SOP), the state of charge (SOC), the internal resistance, and the model of the battery pack 31. The physical quantities related to the operating state of the battery pack 31 include one or more of the above disclosed physical quantities in combination with time.

[0112] S202: determining the operating states of the first motor and the second motor.

[0113] Based on the physical quantities related to the operating state of the battery pack, the output capability of the battery pack is determined, and the operating states of the first motor and the second motor are determined.

[0114] Exemplarily, the mode selection module 174 determines the working mode configured for the electric power tool based on the physical quantities related to the operating state of the battery pack 31. Exemplarily, the controller 171 determines the working mode configured for the electric power tool based on the relationship between the detection value of the first detector 1731 and the preset threshold value. Exemplarily, the controller 171 determines the output capability of the battery pack 31 based on the relationship between the detection value of the first detector 1731 and the preset threshold value, and determines the working mode configured for the electric power tool based on the output capability of the battery pack 31. The relationship between the detection value of the first detector 1731 and the preset threshold value includes: the comparison between the detection value and the threshold value of the detection value, the comparison between the change value of the detection value and the threshold value of the change value of the detection value, the comparison between the result value of the detection value through one or two or multiple calculations and the threshold value of the result value, and the comparison between the change value of the result value and the threshold value of the result value.

[0115] ​Optionally, the detection value of the first detector 1731 is the output current value of the battery pack 31, and the controller 171 can determine the working mode configured for the power tool based on the comparison between the current value and the current value threshold. Optionally, the detection value of the first detector 1731 is the output current value of the battery pack 31, and the controller 171 can determine the working mode configured for the power tool based on the comparison between the variation of the current value detected for two or more times and the current value variation threshold. Optionally, the detection value of the first detector 1731 is the output current value of the battery pack 31, and the controller 171 can determine the working mode configured for the power tool based on the comparison between the average value of the current value detected for two or more times and the current value average threshold.

[0116] In the embodiment, the output capability of the battery pack 31 includes low output capability, medium output capability and high output capability. For example, when the SOC of the battery pack 31 is less than or equal to a first capacity threshold, for example, 20%, the battery pack 31 is defined as low output capability; when the SOC of the battery pack 31 is greater than or equal to a second capacity threshold, for example, 75%, the battery pack 31 is defined as high output capability; and when the SOC of the battery pack 31 is greater than the first capacity threshold and less than the second capacity threshold, the battery pack 31 is medium output capability. For example, when the discharge power of the battery pack 31 is less than or equal to a first power threshold, the battery pack 31 is defined as low output capability; when the discharge power of the battery pack 31 is greater than or equal to a second power threshold, the battery pack 31 is defined as high output capability; and when the discharge power of the battery pack 31 is greater than the first power threshold and less than the second power threshold, the battery pack 31 is medium output capability, and the first power threshold is less than the second power threshold. It can be understood that the output capability of the battery pack 31 can also be defined by the remaining energy, discharge current, voltage, cycle life, internal resistance and temperature of the battery pack 31.

[0117] In the embodiment, when the battery pack 31 is determined to be high output capability by the physical quantity related to the running state of the battery pack 31, the mode selection module 174 of the controller 171 determines that the power tool is switched to the first working mode for running. When the battery pack 31 is determined to be medium output capability by the physical quantity related to the running state of the battery pack 31, the mode selection module 174 of the controller 171 determines that the power tool is switched to the adaptive mode for running. When the battery pack 31 is determined to be low output capability by the physical quantity related to the running state of the battery pack 31, the mode selection module 174 of the controller 171 determines that the power tool is switched to the second working mode for running. When the controller 171 determines that the power tool is switched to the first working mode or the second working mode for running, the switching signal is used as an input instruction, and the controller 171 responds to the switching signal to call the driving parameters corresponding to the first working mode or the second working mode to determine that the motor enters the state corresponding to the first working mode or the second working mode for running.

[0118] As Figure 12 shown in FIG. 1, a control method of a power tool, the power tool switches working mode by electronic identification, the controller 171 includes a mode selection module 174, the mode selection module 174 determines the working mode of the power tool according to the physical quantity related to the running state of the battery pack 31, the specific steps are as follows:

[0119] S301: Start.

[0120] S302: The first detector 1731 detects the physical quantity related to the running state of the battery pack 31.

[0121] The first detector 1731 is configured to detect the physical quantity related to the running state of the battery pack 31. The physical quantity related to the running state of the battery pack 31 includes but is not limited to the voltage, current, temperature, state of power (SOP), state of charge (SOC), internal resistance and model of the battery pack 31. The physical quantity related to the running state of the battery pack 31 includes one or more of the above-mentioned physical quantities combined with time.

[0122] S303: The controller 171 determines the output capacity of the battery pack 31 based on the relationship between the detection value of the first detector 1731 and the preset threshold value.

[0123] When the SOC of the battery pack 31 is less than or equal to the first electric quantity threshold value, for example, 20%, the battery pack 31 is defined as low output capacity, when the SOC of the battery pack 31 is greater than or equal to the second electric quantity threshold value, for example, 75%, the battery pack 31 is defined as high output capacity, when the SOC of the battery pack 31 is greater than the first electric quantity threshold value and less than the second electric quantity threshold value, the battery pack 31 is medium output capacity. For example, when the discharge power of the battery pack 31 is less than or equal to the first power threshold value, the battery pack 31 is defined as low output capacity, when the discharge power of the battery pack 31 is greater than or equal to the second power threshold value, the battery pack 31 is defined as high output capacity, when the discharge power of the battery pack 31 is greater than the first power threshold value and less than the second power threshold value, the battery pack 31 is medium output capacity, the first power threshold value is less than the second power threshold value. It can be understood that the output capacity of the battery pack 31 can also be defined by the remaining energy, discharge current, voltage, cycle life of the battery, internal resistance and temperature of the battery pack 31.

[0124] S304: Determine that the battery pack 31 has high output capacity. If yes, execute S305. If not, return to S303.

[0125] S305: The mode selection module 174 determines that the power tool switches to the first working mode.

[0126] S306: The first motor and the second motor are jointly driven.

[0127] driving the first motor and the second motor jointly and keeping the first motor and the second motor jointly driven.

[0128] S314: determining that the battery pack 31 is in medium output capability. If yes, S315 is executed. If no, S303 is returned.

[0129] S315: the mode selection module 174 determines that the power tool switches to the adaptive mode.

[0130] S316: dynamically adjusting the driving parameters of the motor assembly.

[0131] S324: determining that the battery pack 31 is in low output capability. If yes, S325 is executed. If no, S303 is returned.

[0132] S325: the mode selection module 174 determines that the power tool switches to the second working mode.

[0133] S326: driving the first motor and braking the second motor.

[0134] driving the first motor, braking the second motor and keeping the state that only the first motor operates.

[0135] In some embodiments, the controller 171 determines whether to respond to the working mode configuration signal of the power tool based on the physical quantity related to the running state of the battery pack 31. For example, the working mode configuration signal of the power tool is generated by the switching instruction input by the user through the mode switching part 70, and the working mode configuration signal of the power tool is determined by the controller 171 through the preset physical quantity identification. For example, the working mode configuration signal of the power tool comes from the mode switching part 70, the mode switching part 70 receives the switching instruction input by the user, and sends the signal for executing the adaptive mode or the first working mode or the second working mode. For example, the working mode configuration signal of the power tool is output by the signal output of the mode selection module 174 of the controller 171, the mode selection module 174 sends the signal for configuring the adaptive mode or the first working mode or the second working mode of the power tool based on the parameter identification result, for example, the physical quantity related to the running state of the motor assembly 20, and the specific content will be described in detail below. In this embodiment, the controller 171 determines whether to respond to the signal from the mode switching part 70 or the mode selection module 174 based on the physical quantity related to the running state of the battery pack 31, that is, when the power tool receives the switching or configuration signal of the working mode, the controller 171 determines whether the working mode can be switched according to the above signal according to the physical quantity related to the running state of the battery pack 31, and the switching is not affected by whether the user manually switches or the power tool automatically identifies.

[0136] In some embodiments, when the battery pack 31 is determined to be in low output capability by the physical quantity related to the running state of the battery pack 31, the mode selection module 174 of the controller 171 only responds to the configuration signal of the second working mode, that is, when the battery pack 31 is in low output capability, even if the controller 171 receives a signal to switch to the adaptive working mode or the first working mode, the controller 171 will not respond. When the battery pack 31 is determined to be in medium output capability by the physical quantity related to the running state of the battery pack 31, the mode selection module 174 of the controller 171 does not respond to the signal of the first working mode. That is, when the battery pack 31 is determined to be in medium output capability by the physical quantity related to the running state of the battery pack 31, the configuration of the first working mode will not be responded, and the motor assembly will not continue to maintain the state that the first motor 21 and the second motor 22 are jointly driven. When the battery pack 31 is determined to be in medium output capability by the physical quantity related to the running state of the battery pack 31, in the adaptive mode, when it is determined according to the identification result of the detector that the first motor and the second motor need to be jointly driven, the controller responds to the above-mentioned driving signal, and in the adaptive mode, the time for the motor assembly to operate in the state that the first motor and the second motor are jointly driven is less than or equal to a preset time threshold. For example, the preset time threshold is different according to different nominal capacity of the battery pack, nominal voltage of the battery pack, and different models of the first motor and the second motor. Compared with the nominal capacity of the battery pack, the larger the nominal capacity of the battery pack, the larger the preset time threshold, the larger the nominal voltage of the battery pack, the larger the preset time, the stronger the output capability of the first motor and the second motor, and the larger the preset time threshold. When the battery pack 31 is determined to be in high output capability by the physical quantity related to the running state of the battery pack 31, the configuration signal of all working modes can be responded.

[0137] As shown in Figure 13 a control method of a power tool, the controller 171 determines whether to respond to the working mode configuration signal of the power tool based on the physical quantity related to the running state of the battery pack 31, and the specific steps are as follows:

[0138] S401: Start.

[0139] S402: The controller 171 receives the configuration signal of the working mode of the power tool.

[0140] The configuration signals include the working mode configuration signal generated by the switching instruction input by the user through the mode switching part 70 and the working mode configuration signal determined by the controller 171 after identifying the preset physical quantity. For example, the working mode configuration signal of the power tool comes from the mode switching part 70, which receives the switching instruction input by the user and sends the signal to execute the adaptive mode or the first working mode or the second working mode. For example, the working mode configuration signal of the power tool is output by the signal output of the mode selection module 174 of the controller 171, which sends the signal to configure the power tool in the adaptive mode or the first working mode or the second working mode based on the physical quantity related to the running state of the motor assembly 20 and / or the physical quantity related to the running state of the battery pack 31.

[0141] S403: The first detector 1731 detects the physical quantity related to the running state of the battery pack 31.

[0142] S404: The controller determines the output capacity of the battery pack based on the relationship between the detection value of the second detector and the preset threshold value.

[0143] S405: If the battery pack has high output capacity, S406 is executed, otherwise, S404 is returned.

[0144] S406: The mode selection module 174 responds to all configuration signals.

[0145] S415: If the battery pack has medium output capacity, S416 is executed, otherwise, S404 is returned.

[0146] S416: The mode selection module 174 does not respond to the configuration signal of the first working mode.

[0147] S425: If the battery pack has low output capacity, S426 is executed, otherwise, S404 is returned.

[0148] S426: The mode selection module 174 only responds to the configuration signal of the second working mode.

[0149] In the related art, battery packs 31 of different types and capacities have different output capacities. If the power tool's operating mode fails to effectively match the output capacity of the battery pack 31, the output capacity of the battery pack 31 may not be sufficient to provide sufficient charge and power for simultaneous operation of multiple motors. Alternatively, the battery pack 31 may have a strong output capacity but be limited to driving only one motor. In other words, the output capacity of the battery pack 31 is poorly compatible with the operating mode of the power tool's motor assembly 20. In this embodiment, the controller 171 directly determines the power tool's operating mode based on physical quantities related to the operating state of the battery pack 31, or limits the switching of the power tool's operating mode based on physical quantities related to the operating state of the battery pack 31. This avoids the mismatch between the output capacity of the battery pack 31 and the operating mode of the power tool's motor assembly 20, and improves the compatibility between the output capacity of the battery pack 31 and the operating mode of the power tool. For example, if multiple motors are forced to operate simultaneously when the output capacity of the battery pack 31 is insufficient, damage to the battery pack 31 and power tool components may occur.

[0150] In some embodiments, in adaptive mode, the first detector 1731 is configured to detect physical quantities related to the operating state of the battery pack 31. The controller 171 dynamically adjusts the operating states of the first motor 21 and the second motor 22 based on the physical quantities related to the operating state of the battery pack 31 detected by the first detector 1731. Optionally, the physical quantities related to the operating state of the battery pack 31 include, but are not limited to, the voltage, current, temperature, state of power (SOP), state of charge (SOC), internal resistance, and model of the battery pack 31. Exemplarily, the physical quantities related to the operating state of the battery pack 31 include a combination of one or more of the aforementioned physical quantities and time. The controller 171 determines the output capacity of the battery pack 31 based on the relationship between the detection value of the first detector 1731 and a preset threshold. Based on the output capacity of the battery pack 31, the controller 171 switches the operating state of the motor assembly 20, for example, whether the first motor 21 or the second motor 22 is driven, or whether the first motor 21 and the second motor 22 are driven jointly. Exemplarily, the relationship between the detection value of the first detector 1731 and the preset threshold value includes: comparing the detection value with the detection value threshold value, comparing the change in the detection value with the detection value change threshold value, comparing the result value of the detection value obtained through a unary, binary, or multivariate calculation with the result value threshold value, and comparing the change in the result value with the result value threshold value. Exemplarily, when the battery pack 31 has a low output capacity, only the first motor 21 or the second motor 22 can be driven.

[0151] like Figure 14 As shown, a control method for an electric tool in adaptive mode, the specific steps are as follows:

[0152] S501: Start.

[0153] S502: The power tool enters the adaptive mode.

[0154] S503 : Determine the output capacity of the battery pack 31 based on the relationship between the detection value of the first detector 1731 and a preset threshold.

[0155] S504: Based on the output capacity of the battery pack 31, switch the operating state of the motor assembly 20.

[0156] like Figure 15 As shown, as an alternative embodiment, the controller 171 determines the configured operating mode of the power tool based on physical quantities related to the operating state of the motor assembly 20. Exemplarily, the control circuit includes a second detector 1732 configured to detect physical quantities related to the operation of the motor assembly 20. Optionally, the physical quantities related to the operation of the motor assembly 20 include electrical parameters of the first motor 21 and / or the second motor 22, and electrical or physical parameters of circuit components connected to the first motor 21 and / or the second motor 22. Optionally, the physical quantities related to the operation of the motor assembly 20 include: bus current, phase current, bus voltage, phase voltage, commutation parameters, and other physical quantities detectable by sensors or electronic components of the first motor 21 and / or the second motor 22. Optionally, the physical quantities related to the operation of the motor assembly 20 include: rotational speed, angular velocity, acceleration, angular acceleration, and other physical quantities detectable by sensors or electronic components of the first motor 21 and / or the second motor 22 and / or the output shaft 30. Optionally, the physical quantities related to the operation of the motor assembly 20 include: the temperature, sound, vibration, etc. of the first motor 21 and / or the second motor 22. Optionally, the electrical parameters or physical parameters of the circuit components connected to the first motor 21 and / or the second motor 22 include the current, voltage, temperature, and vibration of the switching elements and other capacitive or resistive elements in the drive circuit 172. Exemplarily, the physical quantities related to the operating state of the motor assembly 20 include a combination of one or more of the physical quantities disclosed above. Exemplarily, the physical quantities related to the operating state of the motor assembly 20 include a combination of one or more of the physical quantities disclosed above and time.

[0157] For example, the controller 171 determines the working mode of the power tool based on the relationship between the detection value of the second detector 1732 and a preset threshold. The relationship between the detection value of the second detector 1732 and the preset threshold includes: comparison of the detection value with a detection value threshold, comparison of the change value of the detection value with a change value threshold, comparison of the result value of the detection value through a unary or binary or multi-value calculation with a result value threshold, and comparison of the change value of the result value with a result value threshold. Alternatively, the detection value of the second detector 1732 is a current value, and the controller 171 can determine the working mode of the power tool based on comparison of the current value with a current value threshold. Alternatively, the detection value of the second detector 1732 is a current value, and the controller 171 can determine the working mode of the power tool based on comparison of the change value of the current value in two or more detections with a current value change value threshold. Alternatively, the detection value of the second detector 1732 is a current value, and the controller 171 can determine the working mode of the power tool based on comparison of the average value of the current value in two or more detections with a current value average value threshold. Alternatively, the detection value of the second detector 1732 is a current value, and the controller 171 can determine the working mode of the power tool based on comparison of the value or change value of the motor torque calculated from the current value with a related threshold.

[0158] In the embodiment, the load of the output shaft 30 is determined by the physical quantity related to the operating state of the motor assembly 20. For example, the controller 171 determines the load of the output shaft 30 based on the rotation speed of the output shaft 30 and / or the current value, and determines the working mode of the power tool according to the load of the output shaft 30. For example, when the power tool is in the adaptive state, when the rotation speed of the output shaft 30 is higher than a first set threshold and / or the current of the motor (the first motor 21 and / or the second motor 22) is less than a first set threshold and / or the change value of the rotation speed of the output shaft 30 is lower than a first set threshold, at this time, the output shaft 30 is in a low load state, and the controller 171 determines that the power tool switches to the second working mode for operation. When the rotation speed of the output shaft 30 is lower than a second set threshold and / or the current of the motor (the first motor 21 and / or the second motor 22) is greater than a second set threshold and / or the change value of the rotation speed of the output shaft 30 is greater than a second set threshold, the output shaft 30 is in a high load state, and the controller 171 determines that the power tool switches to the first working mode for operation. The first set threshold of the rotation speed is not less than the second set threshold. The first set threshold of the current is not greater than the second set threshold. The first set threshold of the change value of the rotation speed is not less than the second set threshold.

[0159] The mode selection module 174 of the controller 171 determines the switching signal as an input instruction when the power tool switches to the first working mode or switches to the second working mode for operation, and the controller 171 responds to the switching signal to determine that the motor assembly 20 enters the state corresponding to the first working mode or the second working mode for operation. Optionally, when the motor assembly 20 enters the first working state or the second working state, the running state of the first motor and / or the second motor can also be dynamically adjusted according to the detection result of the second detector 1732. Optionally, when the controller 171 determines that the power tool switches to the first working mode or switches to the second working mode for operation, the controller 171 responds to the switching signal and calls the corresponding input instruction, and the controller 171 responds to the called input instruction to determine one or more groups of preset driving parameters corresponding to the input instruction. The driving motor assembly 20 enters the state corresponding to the first working mode or the second working mode for operation.

[0160] As shown in Figure 16 A control method of a power tool, the power tool switches the working mode by electronic identification, the controller 171 includes a mode selection module 174, the mode selection module 174 determines the working mode configured by the power tool based on the physical quantity related to the running state of the motor assembly 20, and specifically includes the following steps:

[0161] S601: Start.

[0162] S602: The power tool is in an adaptive working mode.

[0163] S603: Determine the relationship between the detection value of the second detector 1732 and the preset threshold value.

[0164] The second detector 1732 detects the physical quantity related to the running of the motor assembly 20, and the controller 171 determines the working mode configured by the power tool based on the relationship between the detection value of the second detector 1732 and the preset threshold value. The load of the output shaft 30 is determined by the physical quantity related to the running state of the motor assembly 20.

[0165] S614: The output shaft 30 is in a low load condition, if yes, execute S615, if not, execute S602.

[0166] When the output shaft 30 speed is higher than the first set threshold value, and / or the current of the motor (the first motor 21 and / or the second motor 22) is less than the first set threshold value, and / or the speed change amount of the output shaft 30 is lower than the first set threshold value, at this time, the output shaft 30 is in a low load condition.

[0167] S615: The mode switching module 174 switches the power tool to the second working mode.

[0168] S616: drive the first motor and brake the second motor.

[0169] The first motor is driven and the second motor is braked based on the driving parameter. The driving parameter can be a preset set of driving parameter data or driving parameter data dynamically adjusted according to the detection structure of the second detector 1732.

[0170] S624: If the output shaft is in a high load condition, S625 is executed; otherwise, S602 is executed.

[0171] When the output shaft 30 speed is lower than the second set threshold, and / or the current of the motor (the first motor 21 and / or the second motor 22) is greater than the second set threshold, and / or the output shaft 30 speed change is greater than the second set threshold, the output shaft 30 is in a high load condition.

[0172] S625: The mode switching module 174 switches the power tool to the first working mode.

[0173] S626: The first motor and the second motor are jointly driven.

[0174] The first motor and the second motor are jointly driven based on the preset driving parameter. The driving parameter can be a preset set of driving parameter data or driving parameter data dynamically adjusted according to the detection structure of the second detector 1732.

[0175] In some embodiments, in the adaptive mode, the controller 171 dynamically adjusts the operating states of the first motor 21 and the second motor 22 according to the physical quantities related to the operating states of the motor assembly 20 detected by the second detector 1732. For example, the controller 171 determines whether to drive or standby the second motor 22 based on the relationship between the detection value of the second detector 1732 and a preset threshold. The relationship between the detection value of the detector 173 and the preset threshold includes: comparison of the detection value with the threshold of the detection value, comparison of the change value of the detection value with the threshold of the change value of the detection value, comparison of the result value of the detection value through one or two or multiple calculations with the threshold of the result value, and comparison of the change value of the result value with the threshold of the result value. For example, the physical quantities related to the operating states of the motor assembly 20 include the bus current, phase current, bus voltage, phase voltage, commutation parameter, etc. of the first motor 21 and / or the second motor 22, which can be detected by sensors or electronic elements. Optionally, the physical quantities related to the operating states of the motor assembly 20 include the rotation speed, angular speed, acceleration, angular acceleration, etc. of the first motor 21 and / or the second motor 22 and / or the output shaft 30, which can be detected by sensors or electronic elements. Optionally, the physical quantities related to the operating states of the motor assembly 20 include the temperature, sound, vibration, etc. of the first motor 21 and / or the second motor 22. Optionally, the electrical parameters or physical parameters of the circuit components connected to the first motor 21 and / or the second motor 22 include the current, voltage, temperature, vibration, etc. of the switching elements and other capacitive or resistive elements in the drive circuit 172. For example, the physical quantities related to the operating states of the motor assembly 20 include one or more combinations of the above-mentioned physical quantities. For example, the physical quantities related to the operating states of the motor assembly 20 include one or more combinations of the above-mentioned physical quantities and time.

[0176] In some embodiments, as Figure 6As shown, the power tool also includes a vision control system 72, which is connected to a controller 171. The vision control system 72 is configured to determine the required machining conditions for the workpiece before the power tool contacts it and transmit corresponding input instructions to the controller 171. The controller 171 then matches the corresponding operating mode based on the input instructions. For example, if the workpiece being cut is a wooden board with a thickness exceeding a threshold, the vision control system 72 is located at one end of the power tool's forward direction. If the vision control system 72 detects that the thickness of the workpiece exceeds the threshold, it sends an input signal to the controller 171 to configure the power tool to operate in the first operating mode. Based on the input signal, the controller 171 configures the power tool to prepare for operation or enter the operating state in the first operating mode. In some embodiments, in the adaptive operating mode, the controller 171 dynamically adjusts the operating states of the first motor 21 and the second motor 22 based on the conditions of the workpiece detected by the vision control system. For example, if the workpiece being cut is a wooden board with a thickness exceeding a threshold, the vision control system sends a signal to the controller 171 to configure the motor assembly 20 to operate in a combined manner with the first motor 21 and the second motor 22. For example, if the workpiece to be cut is a wooden board with a thickness below a threshold, the visual control system 72 recognizes that the workpiece to be cut is ultra-thin and sends a signal to the controller 171 to configure the motor assembly 20 so that the first motor 21 is driven alone.

[0177] Illustratively, vision control system 72 includes a light source, a lens, a CCD camera, an image processing unit (or image acquisition card), an image processing chip, a monitor, and a communication / input / output unit. Vision control system 72 is similar to the technical solutions disclosed in related art. Since vision control systems themselves are well known to those skilled in the art, a detailed description thereof will be omitted for the sake of brevity.

[0178] like Figures 4 to 5 As shown, the power transmission mechanism 40 includes a transmission assembly 41 disposed between at least one of the first motor 21 and the second motor 22 and the output shaft 30. The transmission assembly 41 includes at least a reduction mechanism. A clutch assembly 42 is disposed between the first motor 21 and the second motor 22. The clutch assembly 42 is configured to restrict or allow at least one of the first drive shaft 211 and the second drive shaft 221 from driving the output shaft 30 under predetermined conditions. It will be appreciated that the clutch assembly 42 is disposed between the first motor 21 and the second motor 22. In terms of orientation, the clutch assembly 42 at least partially overlaps with either the first motor 21 or the second motor 22 in the axial direction of the drive shaft, or at least partially overlaps with either the first motor 21 or the second motor 22 in the radial direction of the drive shaft. Furthermore, the clutch assembly 42 is directly or indirectly connected to each of the first motor 21 and the second motor 22, or provides a direct or indirect power transmission path.

[0179] In the present embodiment, the clutch assembly 42 comprises a one-way clutch 421. The one-way clutch 421 is operable to connect the rotation of the first motor 21 and the second motor 22 in a first rotational direction, and disconnect the rotation of the first motor 21 and the second motor 22 in a second rotational direction. Alternatively, the clutch assembly 42 is a one-way bearing, an overrunning clutch.

[0180] The second motor 22 cooperates with the first motor 21 through the one-way clutch 421. When the first motor 21 and the second motor 22 rotate in the same direction, if the rotation speed of the second driving shaft 221 of the second motor 22 is lower than the rotation speed of the first driving shaft 211 of the first motor 21, the one-way clutch 421 limits the second driving shaft 221 to drive the output shaft 30. In the process of increasing the rotation speed of the second driving shaft 221 of the second motor 22, the one-way clutch is driven by the engagement force of the second motor until the one-way clutch engages to allow the first driving shaft and the second driving shaft to jointly drive the output shaft. When the rotation speed of the second driving shaft 221 of the second motor 22 is greater than or equal to the rotation speed of the first driving shaft 211 of the first motor 21, the one-way clutch 421 allows the second driving shaft 221 to drive the output shaft 30. In the process of the one-way clutch 421 from limiting the second driving shaft 221 to drive the output shaft 30 to allowing the second driving shaft 221 to drive the output shaft 30, the rotation speed of the output shaft 30 experiences a process from being lower than the output rotation speed of the first motor 21 to being greater than or equal to the output rotation speed of the first motor 21. At the moment when the rotation speed of the first driving shaft 211 of the first motor 21 is equal to the rotation speed of the second driving shaft 221 of the second motor 22 for the first time, the one-way clutch 421 will impact and engage the output torque. However, the greater the engagement force of the second motor on the one-way clutch before the impact, the stronger the impact force on the engagement of the one-way clutch. Moreover, the applicant found that the engagement force of the second motor is affected by the difference between the rotation speed of the first driving shaft 211 of the first motor 21 and the rotation speed of the second driving shaft 221 of the second motor 22 when the one-way clutch engages. The greater the difference between the rotation speed of the first driving shaft 211 of the first motor 21 and the rotation speed of the second driving shaft 221 of the second motor 22, that is, the faster the second driving shaft 221 of the second motor 22 rotates, the greater the engagement force of the second driving shaft 221, and the stronger the impact force on the one-way clutch. The greater the attenuation of the life of the clutch.

[0181] In the embodiment, the controller 171 is configured to drive the first driving shaft 211 of the first motor 21 to rotate at a first rotating speed, and when the second rotating speed of the second driving shaft 221 of the second motor 22 is less than the first rotating speed, adjust the driving force parameter affecting the engagement force of the clutch assembly 42 of the second motor 22 based on the difference between the second rotating speed and the first rotating speed. In the embodiment, the driving force parameter of the second motor 22 includes the rotating speed of the second driving shaft 221, the acceleration of the second driving shaft 221, the angular speed of the second driving shaft 221, the angular acceleration of the second driving shaft 221, the torque of the second driving shaft 221, the current of the second motor 22, the voltage of the second motor 22, the commutation data of the second motor 22, and the values obtained by one or two or multiple calculations of the above data.

[0182] In the embodiment, the driving force parameter affecting the engagement force of the clutch assembly 42 of the second motor 22 is adjusted based on the difference between the second rotating speed and the first rotating speed to adjust the impact force when the clutch is engaged, thereby improving the service life of the clutch.

[0183] In the embodiment, when the difference between the second rotating speed and the first rotating speed is greater than or equal to a preset difference value, the second motor 22 increases the rotating speed with the first driving force parameter corresponding to the first engagement force. When the difference between the second rotating speed and the first rotating speed is less than the preset difference value, the second motor 22 increases the rotating speed with the second driving force parameter corresponding to the second engagement force, and the second engagement force is less than the first engagement force. In the embodiment, when the difference between the rotating speed of the first driving shaft 211 of the first motor 21 and the rotating speed of the second driving shaft 221 of the second motor 22 is greater than the preset difference value, the second motor 22 is driven with a larger first engagement force to quickly increase the speed to reduce the rotating speed difference between the first motor 21 and the second motor 22. When the difference between the rotating speed of the first driving shaft 211 of the first motor 21 and the rotating speed of the second driving shaft 221 of the second motor 22 is less than or equal to the preset difference value, the rotating speed between the second motor 22 and the first motor 21 is close, and the one-way clutch 421 is about to engage. At this time, the engagement force of the second motor 22 is reduced, thereby reducing the engagement impact force of the one-way clutch 421 when engaging, protecting the one-way clutch 421, and prolonging the service life of the one-way clutch 421. Soft starting of the second motor 22 can also reduce the noise and vibration in the instant of participation in driving of the second motor 22.

[0184] In the embodiment, the driving force parameter is taken as the acceleration of the second driving shaft 221 of the second motor 22, and the acceleration of the second motor 22 is adjusted based on the difference between the second rotating speed and the first rotating speed. The acceleration of the second motor 22 is adjusted to reduce the speed increasing rate of the second motor 22, thereby reducing the engagement force of the second motor 22.

[0185] In this embodiment, when the difference between the second speed and the first speed is greater than or equal to a preset difference, the second motor 22 increases its speed at a first acceleration. When the difference between the second speed and the first speed is less than the preset difference, the second motor 22 increases its speed at a second acceleration, where the second acceleration is less than the first acceleration. In this embodiment, when the difference between the speed of the first drive shaft 211 of the first motor 21 and the speed of the second drive shaft 221 of the second motor 22 is greater than the preset difference, the second motor 22 accelerates faster and increases its speed to reduce the speed difference between the first motor 21 and the second motor 22. When the difference between the rotational speed of the first drive shaft 211 of the first motor 21 and the rotational speed of the second drive shaft 221 of the second motor 22 is less than or equal to the preset difference, the rotational speeds of the second motor 22 and the first motor 21 are close, and the one-way clutch 421 is about to engage. At this time, the acceleration of the second motor 22 is reduced, so that the speed increase rate of the second motor 22 is reduced, thereby reducing the engagement impact force of the one-way clutch 421 when engaging, protecting the one-way clutch 421 and extending the life of the one-way clutch 421.

[0186] In this embodiment, the second motor 22 increases its speed so that the clutch assembly 42 allows the first drive shaft 211 and the second drive shaft 221 to jointly drive the output shaft 30. Exemplarily, the second motor 22 increases its speed at the second acceleration so that the second speed equals the first speed. When the clutch assembly 42 allows the first drive shaft 211 and the second drive shaft 221 to drive the output shaft 30, the clutch assembly 42, such as the one-way clutch 421, has already engaged. Based on actual product operating conditions and preset parameter settings, the second speed of the second motor 22 is greater than or equal to the first speed of the first motor 21.

[0187] For example, Figure 19a As shown, the power tool further includes a speed detector 1733 for detecting speed-related values ​​of the first drive shaft 211 of the first motor 21 and the second drive shaft 221 of the second motor 22. Exemplarily, the speed-related values ​​include the speed value, the change in speed value, the result of a one-, two-, or multiple-element calculation of the detected value, or the change in the result value. Exemplarily, the speed detector 1733 is a position sensor that detects the speed of the first drive shaft 211 and / or the second drive shaft 221. Exemplarily, the speed detector 1733 detects the angular velocity, acceleration, or angular acceleration of the first drive shaft 211 and / or the second drive shaft 221 to calculate the speed of the first drive shaft 211 and / or the second drive shaft 221. Optionally, the speed detector 1733 includes a position sensor, specifically a photodiode sensor, a magnetic sensor, or a potentiometer. The speed detector 1733 may also be a rotation sensor, specifically a gyroscope sensor. The gyroscope sensor may be a single-, two-, or three-axis micro-electromechanical system (MEMS) sensor or a rotational sensor.

[0188] In some embodiments, as shown in Figure 19b The power tool further comprises a motor electrical parameter detector 1734 configured to detect electrical parameters of the first motor 21 and the second motor 22 to represent the rotation speed of the first driving shaft 211 and the second driving shaft 221, the electrical parameters including current-related parameters, voltage-related parameters, and commutation-related parameters. Optionally, the power tool comprises a rotation speed detector 1733 and the motor electrical parameter detector 1734, that is, the first driving shaft 211 parameter of the first motor 21 and the second driving shaft 221 parameter of the second motor 22 can be detected by the rotation speed detector 1733 and the motor electrical parameter detector 1734, respectively.

[0189] In some alternative embodiments, the clutch assembly 42 further comprises other mechanical clutch assemblies. For example, a dog clutch, a ratchet clutch, a centrifugal clutch, a differential, a friction clutch, and a hydraulic clutch, which can be used as the clutch assembly of the present application in simple transformation or combination. As long as the function of the clutch assembly of the present application can be achieved, the specific form of the structure does not affect the essential content of the present application.

[0190] In some embodiments, the clutch assembly 42 further comprises an electronic clutch. For example, an electromagnetic clutch. For example, a dry single-plate electromagnetic clutch, a dry multi-plate electromagnetic clutch, a wet multi-plate electromagnetic clutch, a magnetic powder clutch, and a slip-type electromagnetic clutch.

[0191] In some embodiments, the coupling of the mechanical clutch assembly and the electronic clutch can be used simultaneously to limit or allow the driving output shaft 30 of at least one of the first driving shaft 211 or the second driving shaft 221 under the preset condition.

[0192] As shown in Figure 17 A method for controlling the rotation speed of the first motor and the second motor of the power tool, the specific steps are as follows:

[0193] S701: Start.

[0194] S702: The first driving shaft 211 of the first motor 21 rotates at a first rotation speed.

[0195] S703: The second driving shaft 221 of the second motor 22 rotates at a second rotation speed.

[0196] S704: The second rotation speed is less than the first rotation speed, if yes, execute S705, if no, execute S703.

[0197] S705: Adjust the driving force parameter of the engagement force of the clutch assembly of the second motor based on the difference between the second rotation speed and the first rotation speed.

[0198] Adjust the engagement force of the second motor 22 to reduce the impact force when the clutch is engaged, and improve the service life of the clutch.

[0199] As shown in the figure, another method for controlling the rotation speed of the first motor and the second motor of the electric tool, the specific steps are as follows: Figure 18

[0200] S801: Start.

[0201] S802: The first driving shaft 211 of the first motor 21 rotates at a first rotation speed.

[0202] S803: The second driving shaft 221 of the second motor 22 rotates at a second rotation speed.

[0203] S804: The second rotation speed is less than the first rotation speed, if yes, execute S805, if no, execute S803.

[0204] S805: The difference between the second rotation speed and the first rotation speed is greater than or equal to a preset difference value, if yes, execute S806, if no, execute S807.

[0205] S806: The second motor increases the rotation speed with the first driving force parameter corresponding to the first engagement force.

[0206] S807: The second motor increases the rotation speed with the second driving force parameter corresponding to the second engagement force, and the second engagement force is less than the first engagement force.

[0207] When the difference between the rotation speed of the first driving shaft 211 of the first motor 21 and the rotation speed of the second driving shaft 221 of the second motor 22 is greater than the preset difference value, the second motor 22 drives with a larger first engagement force to quickly increase the speed to reduce the difference between the rotation speed of the first motor 21 and the rotation speed of the second motor 22. When the difference between the rotation speed of the first driving shaft 211 of the first motor 21 and the rotation speed of the second driving shaft 221 of the second motor 22 is less than or equal to the preset difference value, the rotation speed between the second motor 22 and the first motor 21 is close, and the one-way clutch 421 will be engaged. At this time, the engagement force of the second motor 22 is reduced, and the engagement impact force of the one-way clutch 421 when engaged is reduced, protecting the one-way clutch 421 and prolonging the service life of the one-way clutch 421.

[0208] S808: The second rotation speed is equal to the first rotation speed, if yes, execute S809, if no, execute S804.

[0209] S809: The clutch assembly allows the first driving shaft and the second driving shaft to jointly drive the output shaft.

[0210] ​The second motor 22 increases the speed at the second acceleration to make the second speed equal to the first speed. When the clutch assembly 42 allows the first drive shaft 211 and the second drive shaft 221 to drive the output shaft 30, the clutch assembly 42, such as the one-way clutch 421, has completed engagement.

[0211] References Figures 20 to 23 As shown, when the power tool switches operating modes via manual mode, the mode switching unit 70 includes a switch element defined as a mode switch 71. The mode switch 71 is connected to the controller 171 and, when operated, sends a signal to the controller 171 to switch operating modes. When used in manual mode, the power tool switches between at least the adaptive mode and the first operating mode. Users can actively switch operating modes based on their usage habits and specific needs. Compared to automatic operating mode switching via electronic recognition, this provides a more user-friendly operation experience and addresses the lack of usage options for products with only an adaptive mode or the ability to switch between single-motor and dual-motor operating modes, providing a wider range of operating conditions.

[0212] In this embodiment, the mode switch 71 and the start switch 81 are separate switch components. That is, when the power tool switches between manual and manual modes, the power tool is provided with a separate mode switch 71, allowing the user to conveniently and intuitively operate the mode switch 71. In some embodiments, the start switch 81 of the circular saw 100 is activated only when the safety switch 82 is pressed, while the mode switch 71 is provided independently and is not subject to the constraints of the safety switch 82. In some embodiments, the mode switch 71 and the start switch 81 are separate switch components, located at different locations, and are independently connected to the controller 171.

[0213] In some embodiments, the mode switch 71 is disposed on an outer wall of the main housing 11. The main housing 11 includes a housing 112 configured to house the first motor 21 and the second motor 22. It is understood that the housing 112 houses the motor assembly 20 and the drive shaft portion of the motor.

[0214] The host housing 11 further includes a connecting portion 14, which is used to connect the grip portion 12 to the receiving housing 112, wherein the start switch 81 is located on the grip portion 12, and the mode switching switch 71 is located on the connecting portion 14 or the receiving housing 112. For example, Figure 20As shown, the connecting portion 14 includes an upper connecting portion 141 connecting the upper end of the holding portion 12 with the accommodating housing 112, and the upper connecting portion 141 is close to the starting switch 81, and the mode switching switch 71 is arranged on the upper connecting portion 141. Alternatively, the mode switching switch 71 is arranged on the upper surface or the side surface of the upper connecting portion 141. Alternatively, the mode switching switch 71 is arranged in a position within the range that can be simultaneously operated by one hand with the starting switch 81. For example, as shown in Figure 21 As shown, the connecting portion 14 includes a lower connecting portion 142 connecting the lower end of the holding portion 12 with the accommodating housing 112, and the lower connecting portion 142 is close to the bottom plate 51, and the mode switching switch 71 is arranged on the upper surface or the side surface of the lower connecting portion 142. This facilitates the operation of the user and avoids accidental touch.

[0215] For example, the mode switching switch 71 is arranged on the outer side surface of the accommodating housing 112, for example, as shown in Figure 22 and Figure 23 As shown, the accommodating housing 112 surrounds the outer periphery of the stator of the motor, and the mode switching switch 71 is arranged in a position on the outer side wall of the outer periphery of the stator of the motor and the end portion. For example, the accommodating housing 112 extends towards the fixed shroud 62 along the extension direction of the driving shaft of the motor, and the mode switching switch 71 is arranged in a position on the outer side wall of the outer periphery of the driving shaft of the motor 21, 22.

[0216] In the present embodiment, as shown in Figure 6 The battery pack 31 is arranged between the motor assembly 20 and the holding portion 12 for gripping, so that the position of the center of gravity of the circular saw 100 conforms to the operation of the user, and the circular saw 100 can be stably operated. The battery accommodating compartment 15 is arranged on the main machine housing 11 and is semi-opened and formed by being inwardly recessed. In the present embodiment, the accommodating housing 112 is connected with the battery accommodating compartment 15, the battery accommodating compartment 15 is connected with the connecting portion 14, and the battery accommodating compartment 15 is arranged on the same side as the motor assembly 20.

[0217] The battery accommodating compartment 15 includes a combination portion 1511 electrically connected with the battery pack 31, and a tool terminal is arranged on the combination portion 1511. The same structure of the tool terminal is arranged on different electric tools (not shown in the figure). For example, the first motor 21, the second motor 22, the battery pack 31 and the holding portion 12 are arranged on the same side of the cutting member 61, and after the battery pack 31 is inserted into the battery compartment 15, at least part of the battery pack 31 is arranged behind the first motor 21 and the second motor 22, and at least part of the battery pack 31 is arranged in front of the holding portion 12. Alternatively, the battery pack 31 is inserted into the battery compartment 15 obliquely, and in some embodiments, the battery pack 31 is partially arranged above the first motor 21 and the second motor 22.

[0218] For example, as shown in Figure 24As shown, the control circuit board 18 is at least partially disposed under the battery pack 31. Exemplarily, the control circuit board 18 is at least partially disposed under the battery receiving compartment 15. The control circuit board 18 is at least partially disposed radially outside the motor assembly 20. Optionally, as Figure 6 As shown, the control circuit board 18 is at least partially disposed on the upper side of the motor assembly 20. Optionally, as Figure 25 As shown, the control circuit board 18 is at least partially disposed between the motor assembly 20 and the battery pack 31. Optionally, the control circuit board 18 is at least partially disposed between the motor assembly 20 and the battery compartment 15. Figure 26 As shown, the control circuit board 18 is at least partially disposed within the grip portion 12. Exemplarily, multiple control circuit boards 18 are provided, with at least some of the control circuit boards 18 disposed within the housing at one end of the motors 21 and 22. Optionally, multiple control circuit boards 18 are provided, with one control circuit board 18a disposed within the grip portion 12, and the remaining control circuit boards 18b are disposed, respectively, at an end of the first drive shaft 211 of the first motor 21 facing away from the cutting member and at an end of the second drive shaft 221 of the second motor 22 facing away from the cutting member.

[0219] Regarding the arrangement of the first motor 21 and the second motor 22 in the motor assembly 20. In this embodiment, the first drive shaft 211 of the first motor 21 and the second drive shaft 221 of the second motor 22 are arranged along the radial direction of the first drive shaft 211, that is, the first motor 21 and the second motor 22 are arranged non-coaxially. In some embodiments, in this embodiment, the first drive shaft 211 and the second drive shaft 221 are parallel but not overlapped. In this embodiment, the first drive shaft 211 and the second drive shaft 221 are both arranged parallel to the output shaft 30. In some embodiments, as Figure 6 As shown, the first drive shaft 211 and the second drive shaft 221 are arranged along the left-right direction. Figure 25 and Figure 27 As shown, the first drive shaft 211 and the second drive shaft 221 are arranged in the vertical direction, that is, the first motor 21 is located above the second motor 22 or the second motor 22 is located above the first motor 21. Figure 28 and Figure 29 In some embodiments, the first drive axis 211 intersects or is perpendicular to the second drive axis 221. For example, the first drive axis 211 is spatially perpendicular to or intersects the second drive axis 221. For example, when the motor assembly 20 is projected in the up-down direction, the projection of the first drive axis 211 intersects or is perpendicular to the projection of the second drive axis 221.

[0220] like Figure 30 and Figure 31As shown in FIG. 1 , another embodiment disclosed in the present application is different from the first embodiment in that the motor assembly 20 includes multiple motors. For example, the motor assembly 20 includes at least a first motor 21 and a second motor 22. The torque of the first drive shaft 211 and the second drive shaft 221 is output through the output shaft 30. The third motor 23 is also included, and the third motor 23 is used to provide power to components other than the output shaft 30. In some embodiments, as Figure 17 As shown, the circular saw 100 further includes a dust suction fan 91 , and the third motor 23 drives the dust suction fan 91 to rotate so as to generate suction force for dust collection.

[0221] In some embodiments, the motor assembly 20 further includes: a first fan 216 supported by the first drive shaft 211, the first fan 216 is driven by the first motor 21 to rotate and generate a heat dissipation airflow. A second fan 226 supported by the second drive shaft 221, the second fan 226 is driven by the second motor 22 to rotate and generate a heat dissipation airflow. Figure 18 As shown, the system also includes an auxiliary cooling fan. The third motor 23 drives the auxiliary cooling fan (not shown) to generate cooling air for dissipating heat from the motor assembly 20 and / or the controller 171. This improves the heat dissipation efficiency of the motor. In some embodiments, the first drive shaft 211 of the first motor 21 and the third drive shaft 231 of the third motor 23 are arranged radially relative to the first drive shaft 211. In other words, the first motor 21 and the third motor 23 are non-coaxially arranged. In some embodiments, in this embodiment, the first drive shaft 211 and the third drive shaft 231 are parallel but not overlapping. In this embodiment, the first drive shaft 211 and the second drive shaft 221 are both arranged parallel to the third drive shaft 231. In some embodiments, the first drive shaft 211 and the third drive shaft 231 are arranged in a left-right direction. In some embodiments, the first drive shaft 211 and the third drive shaft 231 are arranged in a top-bottom direction. In other embodiments, the first motor 21 is located above the third motor 23, or the third motor 23 is located above the first motor 21. In some embodiments, the first drive shaft 211 and the third drive shaft 231 intersect or are perpendicular. Illustratively, the first drive shaft 211 is spatially perpendicular or spatially intersecting with the third drive shaft 231. Illustratively, when the motor assembly 20 is projected and observed in the up-down direction, the projection of the first drive shaft 211 intersects or is perpendicular to the projection of the third drive shaft 231.

[0222] The above shows and describes 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 form, and any technical solutions obtained by equivalent replacement or equivalent transformation fall within the scope of protection of this application.

Claims

1. An electric tool, characterized in that: include: An output shaft is configured to output torque; the output shaft rotates around an output axis; a motor assembly comprising a plurality of motors having drive shafts; At least a portion of the drive shaft is connected to the output shaft, and at least a portion of the torque of the drive shaft is output through the output shaft; a power supply for providing operating power to the motor assembly; The power supply is connected to the motor assembly; a controller for controlling the operation of the motor assembly; the power tool includes different operating modes, the operating modes including: an adaptive mode, in which the controller receives the output signal of the detector and sends a control signal to the motor assembly to switch the motor assembly so that one or part of the multiple motors in the motor assembly are driven and connected, or so that all the multiple motors are jointly driven and connected; a first operating mode, in which the controller sends a signal to the motor assembly so that all the multiple motors in the motor assembly are jointly driven and connected; A mode switching switch is connected to the controller and is operated to at least send a signal to the controller to switch the working mode to the adaptive mode or a signal to switch the working mode to the first working mode.

2. The electric tool according to claim 1, characterized in that: Also includes; A start switch is connected to the power supply, and the start switch is operated to energize the motor assembly; the start switch and the mode switching switch are different switch elements.

3. The electric tool according to claim 2, characterized in that: include: A main body housing at least includes a housing for accommodating the motor assembly; A bottom plate, movably connected to the host housing; The bottom plate is formed with a bottom surface in contact with the workpiece; The mode switching switch is arranged on the outer wall surface of the host housing.

4. The electric tool according to claim 3, characterized in that: The host housing includes: a grip portion, the grip portion being located at the rear end of the power tool and capable of being gripped by a user to operate the power tool for cutting; A receiving shell configured to receive the first motor and the second motor; A connecting portion, used to connect the gripping portion to the receiving shell; Wherein, the start switch is located on the holding portion, and the mode switching switch is located on the connecting portion or the receiving shell.

5. The electric tool according to claim 3, characterized in that: The power supply includes a battery pack, which is arranged between the motor assembly and the gripping portion for grasping. The main body shell is provided with a semi-open battery accommodating compartment formed by an inward depression.

6. The electric tool according to claim 5, characterized in that: Also includes: A control circuit board includes the controller configured to control the motor assembly; the control circuit board is at least partially disposed under the battery pack.

7. The electric tool according to claim 5, characterized in that: Also includes: A control circuit board includes the controller configured to control the motor assembly; the control circuit board is at least partially disposed within the gripping portion.

8. The electric tool according to claim 7, characterized in that: A plurality of control circuit boards are provided, and at least part of the control circuit boards are provided in a housing at one end of the motor.

9. The electric tool according to claim 5, characterized in that: Also includes: A control circuit board includes the controller configured to control the motor assembly; the control circuit board is at least partially disposed between the motor assembly and the battery pack.

10. The electric tool according to claim 1, wherein: The motor assembly includes at least a first motor and a second motor; the first motor includes a first drive shaft rotating around a first axis; the second motor includes a second drive shaft rotating around a second axis; the first drive shaft and the second drive shaft are arranged along the radial direction of the first drive shaft and the first drive shaft intersects or is perpendicular to the second drive shaft.

11. The electric tool according to claim 1, wherein: The motor assembly includes at least a first motor and a second motor; the first motor includes a first drive shaft rotating around a first axis; the second motor includes a second drive shaft rotating around a second axis; the torque of the first drive shaft and the second drive shaft is output through the output shaft, and the motor assembly also includes a third motor, which is used to provide power to components other than the output shaft.

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