Control method and system for electric machine tool and electric machine tool

Abstract

The invention discloses a control method for an electric machine tool, which comprises the following steps of: when overload protection is triggered, controlling a motor of the electric machine tool to immediately stop rotating in a first rotating direction; and after the overload protection is triggered, the motor rotates in a second rotating direction opposite to the first rotating direction under the action of external bounce, the motor is controlled to continuously rotate in the second rotating direction, and the rotating speed in the second rotating direction is increased, so that the tool head moves to the terminal position in the second direction under the driving action of the motor. Correspondingly, the invention further discloses a control system for the electric tool machine. According to the invention, the motor can be quickly started immediately after overload protection, so that the time of an operation process is shortened on the basis of realizing energy conservation of the system.

Description

Technical Field

[0001] The present invention relates to the field of control, and particularly to a control method and system for a power tool machine. Background Art

[0002] In a power tool system, for example, for an electric scissors or a pipe cutter, during the process of shearing or cutting a material or workpiece, if the material is too hard or tough to shear, resulting in excessive shearing force or too long shearing time, the situation of motor overload will occur.

[0003] In this case, in order to protect the motor and related circuits, an overload protection method is adopted, that is, when overloaded, the motor is turned off to stop rotating.

[0004] After that, if shearing or cutting is to be continued, the electric scissors need to be reset to the position where the tool head is fully opened first with the motor rotating in the reverse direction, and then rotated forward to perform shearing or cutting again.

[0005] In this case, especially for a power tool machine using a sensorless starting motor, it needs to wait for the motor to stop completely in the reverse rotation direction first, and then based on the initial position detection, control the motor to start again in the reverse rotation direction, and then make the motor enter the low-speed stage and the high-speed stage in sequence to achieve the full reset of the tool head, which leads to a very long process for the power tool machine to be put back into use, seriously affecting the work efficiency. Summary of the Invention

[0006] One of the invention objects of the present invention is to provide a control method for a power tool machine, which can efficiently realize the quick start of the motor after overload protection, thus greatly shortening the process time for the tool head to operate on the workpiece to be processed, and at the same time saving system energy.

[0007] Based on the above invention object, the present invention provides a control method for a power tool machine, which includes the steps of:

[0008] When overload protection is triggered, control the motor of the power tool machine to immediately stop rotating in the first rotation direction;

[0009] After overload protection is triggered, the motor rotates in the second rotation direction opposite to the first rotation direction under the action of an external rebound force. Control the motor to continue rotating in the second rotation direction and increase the rotation speed in the second rotation direction, so that the tool head moves to the terminal position in the second direction under the drive of the motor.

[0010] In the above-described embodiments, the control method of the present invention is particularly applicable to a sensorless start motor. As described above, since the sensorless start motor restarts and runs after encountering overload protection, the process of resetting the tool head is very long. Therefore, when the control method of the present invention is applied to a sensorless start motor, the process time can be significantly shortened.

[0011] Another object of the present invention is to provide a control system for an electric power tool machine, which can most efficiently achieve rapid start-up of the motor after overload protection, thereby significantly shortening the process time for the tool head to operate on the workpiece to be processed, and at the same time saving system energy.

[0012] Based on the above object of the invention, the present invention also provides a control system for an electric power tool machine, which includes:

[0013] A control module;

[0014] An execution module, which is connected to the control module to receive the control signal of the control module; the execution module is used to be connected to the motor of the electric power tool machine;

[0015] An overload detection module, which is connected to the control module, and the overload detection module transmits the detected overload state data of the motor to the control module;

[0016] A rotational speed detection module, which is connected to the control module, and the rotational speed detection module transmits the detected rotational speed of the motor to the control module;

[0017] Wherein, when the overload detection module detects that the motor reaches the overload protection state, the control module makes the motor immediately stop rotating in the first rotation direction through the execution module; wherein the rotation of the motor in the first rotation direction is used to drive the tool head connected to the motor to execute an action to process the workpiece to be processed;

[0018] After triggering the overload protection, the motor rotates in the second rotation direction opposite to the first rotation direction under the action of an external rebounding force. The control module controls the motor to continue rotating in the second rotation direction through the execution module and increases the rotational speed in the second rotation direction, so that the tool head moves to the terminal position in the second direction under the driving action of the motor.

[0019] Another object of the present invention is to provide an electric power tool machine, which can be quickly started under overload protection, thereby improving work efficiency.

[0020] Based on the above object of the invention, the present invention also provides an electric power tool machine, which includes the control system as described above.

[0021] By using the control method and system for a power tool according to the present invention, it is possible to enable the power tool to quickly start the motor as soon as possible after overload protection when encountering overload, thereby shortening the time for the tool head to process the workpiece to be processed, such as the time for cutting or shearing processes, and also saving system energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematically shows a power tool, such as an electric scissors.

[0023] Figure 2 Shows a flowchart of the steps of the control method for a power tool according to the present invention in one embodiment.

[0024] Figure 3 Shows a flowchart of the steps of the control method for a power tool according to the present invention in another embodiment.

[0025] Figure 4 Schematically shows a state diagram of the motor speed changing with time in a more specific embodiment of the control method for a power tool according to the present invention.

[0026] Figure 5 Shows a schematic structural framework diagram of the control system for a power tool according to the present invention in one embodiment. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] To make the objectives, technical solutions, and advantages of this specification clearer, the technical solutions of this specification will be clearly and completely described below in conjunction with the specific embodiments of this specification and the corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this specification, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this specification without creative efforts shall fall within the scope of protection of this specification.

[0028] For a power tool in which the tool head performs a reciprocating motion to process the workpiece to be processed, during its working process, when the tool head moves towards the workpiece to be processed and applies a force load to the workpiece to be processed, the motor rotates forward; when the tool head moves away from the workpiece to be processed, the motor rotates in reverse.

[0029] Figure 1 Exemplarily shows a power tool in which the tool head performs a reciprocating motion, such as an electric scissors.

[0030] For the electric scissors 1 as shown in Figure 1 During the process of shearing or cutting a material or workpiece, the motor rotates forward, driving the tool head 11, which is the cutting head, towards the workpiece to be sheared, causing the two cutting heads to close relative to each other.

[0031] In the present invention, shearing or cutting represents a similar meaning, both referring to the tool head contacting the material to be sheared and continuously applying force and load to the material.

[0032] During the shearing or cutting process, if the material is too hard or too tough, making it difficult to shear, the electric scissors need to increase the shearing force or continuously shear for a longer time. When the shearing force is too large or the shearing time is too long, the situation of motor overload often occurs.

[0033] In this case, in order to protect the motor and related circuits, an overload protection method is adopted, that is, once overload occurs, the motor is turned off to make the motor stop rotating.

[0034] After that, if shearing or cutting is to be continued, the electric scissors 1 need to first reset to the position where the tool head 11 is fully opened when the motor rotates in the reverse direction, and then rotate forward to perform shearing or cutting again.

[0035] When the power tool encounters overload protection, the tool head 11 will first bounce under the reaction force generated by the deformation of the material to be cut (that is, move in the direction away from the material to be cut), causing the motor to rotate in the reverse direction. If the motor is braked first at this time, so that the motor stops first in the reverse rotation direction, that is, the rotational speed is 0, and then starts again in the reverse rotation direction, so that the reverse rotational speed reaches the set rotational speed from 0, then this starting process is obviously long and obviously increases the time of the entire cutting process.

[0036] Especially for a sensorless starting motor, when it starts and runs again from a rotational speed of 0, it needs to go through the detection of the initial position of the motor rotor, the low-speed stage, and the high-speed stage in sequence to reset the tool head (that is, the opening or so-called "lifting" of the tool head). If overload protection occurs multiple times during the cutting process, the operation time is significantly increased.

[0037] Based on this, in one embodiment of the present invention, a control method for a power tool is provided, as Figure 2 shown, which may include the steps:

[0038] S1: When overload protection is triggered, control the motor of the power tool to immediately stop rotating in the first rotation direction (which can be called "forward rotation" in some cases);

[0039] S2: After triggering the overload protection, the motor rotates in a second rotation direction opposite to the first rotation direction under the action of an external rebounding force (in some cases, the reaction force generated by the deformation of the material to be cut), which can be called "reverse rotation" in some cases. At this time, the reverse rotation of the motor is a passive rotation based on mechanical force rather than an actively controlled rotation. Then, control the motor to continue rotating in the second rotation direction and increase the rotation speed in the second rotation direction, so that the tool head moves to the terminal position in the second direction under the driving action of the motor.

[0040] It should be noted that in the present invention, the "terminal position" refers to the position where the tool head no longer continues to move in the direction away from the workpiece to be processed. For example, for an electric scissors, the "terminal position" is the position where the cutter head no longer opens or lifts further.

[0041] In some embodiments, the "terminal position" is the limit position where the tool head is fully opened or fully lifted.

[0042] In some other embodiments, the "terminal position" can also be a position where the tool head opens or lifts set by those skilled in the art according to needs.

[0043] In another embodiment, the present invention provides a control method for an electric power tool starting from the start of processing a workpiece to be processed (for example, cutting a workpiece to be cut), as Figure 3 shown, which may include the steps:

[0044] S0: Control the motor to rotate in the first rotation direction and gradually increase the rotation speed in the first rotation direction until the target speed is reached, so as to drive the tool head connected to the motor to act in the first direction opposite to the second direction, thereby processing the workpiece to be processed (for example, the cutter head of an electric scissors shears the material to be cut);

[0045] S1: When the overload protection is triggered, control the motor of the electric power tool to immediately stop rotating in the first rotation direction (which can be called "forward rotation" in some cases);

[0046] S2: After triggering the overload protection, the motor rotates in a second rotation direction opposite to the first rotation direction under the action of an external rebounding force (in some cases, the reaction force generated by the deformation of the material to be cut), which can be called "reverse rotation" in some cases. At this time, the reverse rotation of the motor is a passive rotation based on mechanical force rather than an actively controlled rotation. Then, control the motor to continue rotating in the second rotation direction and increase the rotation speed in the second rotation direction, so that the tool head moves to the terminal position in the second direction under the driving action of the motor.

[0047] It should be noted that, in some embodiments of the present invention, the overload protection may be overcurrent protection, that is, when it is detected that the motor current exceeds the set current threshold, the overcurrent protection is triggered, causing the motor to stop rotating.

[0048] In some other embodiments, the overload protection may also be overtemperature protection, that is, when the power tool machine is performing a loading process on the material to be processed and an overload condition occurs, resulting in a temperature increase, when it is detected that the motor temperature exceeds the set temperature threshold, the overtemperature protection is triggered, causing the motor to stop rotating.

[0049] Of course, in other ways, it may also be other overload forms known to those skilled in the art, resulting in the motor stopping rotating.

[0050] As described above, in some embodiments, the control method for the power tool machine according to the present invention is particularly applicable to motors with sensorless starting.

[0051] It should be noted that sensorless starting is a method of starting the motor by detecting the position of the motor rotor, and a sensor is not provided on the rotor of the motor using sensorless starting. In some cases, for a motor with sensorless starting, the control module can use a sensorless algorithm to start the motor. When starting, the control module applies three-phase voltages to the motor and detects the position of the motor rotor, and starts the motor based on the position detection of the motor rotor. Therefore, compared with a motor that has a sensor on the rotor and performs sensor-based starting, sensorless starting has lower failure rates and system costs.

[0052] In the embodiments using a motor with sensorless starting, the step of controlling the motor to continue rotating in the second rotation direction and increasing the speed in the second rotation direction may specifically include the steps:

[0053] S201: Obtain the rebound speed of the motor in the second rotation direction based on the external rebound force;

[0054] S202: Instead of detecting the initial position of the motor rotor, directly control the motor to continue rotating in the second rotation direction based on the rebound speed, and increase the speed in the second rotation direction to the target speed.

[0055] Compared with the current motor with sensorless starting, after encountering overload protection, the motor has to go through the initial position detection of the motor rotor, the low-speed stage, and the high-speed stage in sequence to start and run. The control method in this embodiment utilizes the rebound speed brought to the motor during the rebound process of the tool head, directly skips the initial position detection, and even in some better embodiments, can directly skip the low-speed stage and directly enter the high-speed stage, thereby realizing the rapid start of the motor. On the basis of greatly shortening the operation process time of the power tool machine, it also saves system energy.

[0056] Of course, in some other embodiments of the present invention, the control method described in the present invention can also be applied to a motor with sensor - based starting. A motor with sensor - based starting is provided with a sensor on the rotor, and it does not perform initial position detection during motor starting. Therefore, the beneficial effects brought by adopting the control method described in the present invention are not as obvious as those of sensor - less starting.

[0057] In some more specific embodiments, the step of directly controlling the motor to continue rotating in the second rotation direction based on the rebound speed and increasing the speed in the second rotation direction to the target speed in step S202 specifically includes the steps:

[0058] S2021: Compare the rebound speed with a set speed threshold;

[0059] S2022: When the rebound speed is higher than the set speed threshold, execute step S2023;

[0060] S2023: Directly increase the speed in the second rotation direction from the rebound speed to the target speed.

[0061] It should be noted that, under actual working conditions, the rebound speed generally is higher than the set speed threshold. Therefore, the subsequent operation is to directly increase the speed in the second rotation direction from the rebound speed to the target speed.

[0062] In addition, in extremely rare and uncommon cases, if the rebound speed is lower than the set speed threshold, the speed in the second rotation direction is first increased from the rebound speed to the set speed threshold, and then the speed is further increased to the target speed.

[0063] It should be noted that those skilled in the art can set the speed threshold according to the needs of actual working conditions. In some exemplary examples, the speed threshold can be set based on the rated speed of the motor. For example, it can be set to 10% or 15% of the rated speed of the motor.

[0064] It can be seen from this that by using the rebound speed brought to the motor during the rebound of the tool head, the control method described in the present invention can directly skip the conventional initial position detection and low - speed stage and directly enter the high - speed stage, thereby greatly shortening the motor starting time.

[0065] Figure 4 Schematically shows a state diagram of the motor speed changing with time of the control method for an electric tool machine described in the present invention under a more specific embodiment.

[0066] As Figure 4 shown, in a more specific embodiment, as the electric tool machine starts to process the workpiece to be processed, the control method for the electric tool machine can specifically include the steps:

[0067] Control the motor to rotate in the first rotation direction (which can be called "forward rotation" in some cases), to achieve a forward start P1, so as to drive the tool head connected to the motor, such as the "downward pressure" or "relative closing" of the tool head of an electric scissors.

[0068] During this process, control the speed of the motor in the first rotation direction to gradually increase by 100 until a constant initial cutting speed of 200 is reached. At this time, the power tool is in the state of forward operation P2. When the tool head contacts the material to be cut and starts to load and cut the material P3, the cutting speed starts to decrease by 300.

[0069] When the overload protection 400 is triggered, control the motor to immediately stop rotating in the first rotation direction (which can be called "forward rotation" in some cases), that is, the speed is 0.

[0070] After the overload protection 400 is triggered, the motor rotates 500 in the second rotation direction opposite to the first rotation direction under the action of an external rebounding force (in some cases, the reaction force generated by the deformation of the material to be cut). At this time, the reverse rotation of the motor is a passive rotation based on mechanical force, rather than an actively controlled rotation.

[0071] Then control the motor to continue rotating 600 in the second rotation direction and increase the speed in the second rotation direction to achieve a reverse runaway start P4 until the speed in the second rotation direction reaches a constant target speed 700. During this process, the tool head continuously moves in a direction away from the material to be processed. Then the motor brakes in the second rotation direction ( Figure 4 not shown in the figure) until the speed of the motor in the second rotation direction is 0. At this time, the tool head reaches the terminal position.

[0072] Figure 5 Shows a schematic structural framework diagram of the control system for a power tool according to the present invention in an embodiment.

[0073] As Figure 5 shown, in another embodiment of the present invention, a control system for a power tool is further provided, which may include:

[0074] A control module 10;

[0075] An execution module 40, which is connected to the control module 10 to receive the control signal of the control module 10; the execution module 40 is used to be connected to the motor of the power tool;

[0076] An overload detection module 20, which is connected to the control module 10, and the overload detection module 20 transmits the detected overload state data of the motor to the control module;

[0077] A rotational speed detection module 30, which is connected to the control module 10, and the rotational speed detection module 30 transmits the detected rotational speed of the motor to the control module 10;

[0078] Wherein, when the overload detection module 20 detects that the motor reaches the overload protection state, the control module causes the motor to immediately stop rotating in the first rotation direction (which can be referred to as "forward rotation" in some cases) through the execution module 40; after triggering the overload protection, the motor rotates in the second rotation direction opposite to the first rotation direction under the action of an external rebound force (which can be referred to as "reverse rotation" in some cases), and the control module 10 controls the motor to continue rotating in the second rotation direction through the execution module 40 and increases the rotational speed in the second rotation direction, so that the tool head moves to the terminal position in the second direction (i.e., the direction away from the workpiece to be processed) under the driving action of the motor.

[0079] It can be understood that the control module described in the present invention can be implemented in various ways. For example, it can be implemented as hardware, software, or a combination thereof.

[0080] For example, the control module can include one or more processors. These processors can use electronic hardware. For example, in some more specific embodiments, it can include a microcontroller (MCU).

[0081] In addition, in other embodiments, it can also be a system on chip (SOC), a digital signal processor (DSP), a field programmable gate array (FPGA), a programmable logic device (PLD), a state machine, gate logic, discrete hardware circuits, and other suitable processing components configured to execute various functions described in the present invention.

[0082] In some other embodiments, the control module can also be implemented by any combination of computer software or electronic hardware and computer software. Whether these processors are implemented as hardware or software will depend on the specific application and the overall design constraints imposed on the system.

[0083] The functions of the processor, any part of the processor, or any combination of the processors given in the present invention can be implemented as software executed by a microprocessor, a microcontroller, a DSP, or other suitable platforms.

[0084] Software can be widely regarded as representing instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, running threads, processes, functions, etc. Software can reside in a computer-readable medium. The computer-readable medium can include, for example, a memory, and the memory can be, for example, a magnetic storage device (such as a hard disk, a floppy disk, a magnetic stripe), an optical disc, a smart card, a flash memory device, a random access memory (RAM), a read-only memory (ROM), a programmable ROM (PROM), an erasable PROM (EPROM), an electrically erasable PROM (EEPROM), a register, or a removable disk.

[0085] Similarly, the execution module in the control system described in the present invention can use electronic hardware. For example, in some embodiments, it can include a MOSFET array containing several MOSFET transistors. In such an embodiment, the control module can control the start, stop, and adjustment and change of the rotational speed of the motor by turning off different MOSFET transistors in the MOSFET array.

[0086] In some other embodiments, the execution module can also be formed by a digital-analog circuit, or implemented by any combination of computer software or electronic hardware and computer software.

[0087] In some embodiments of the present invention, the overload detection module can include a current detection sensor, which detects the current of the motor as overload status data for transmission to the control module.

[0088] In some other embodiments of the present invention, the overload detection module can include a temperature detection sensor, which detects the temperature of the motor as overload status data for transmission to the control module.

[0089] In some embodiments of the present invention, when the control system is applicable to a motor with sensorless starting, the rotational speed detection module can include a back electromotive force detection circuit.

[0090] In some other embodiments, when the control system is applicable to a motor with sensor-based starting, the rotational speed detection module can include a speed sensor, such as a Hall sensor.

[0091] In some more specific embodiments, when the control system is applicable to sensorless starting, the control module performs sensorless starting control on the motor of the power tool. Based on this, when the control module controls the motor to continue rotating in the second rotation direction through the execution module and increases the rotational speed in the second rotation direction, it can specifically include:

[0092] The control module obtains the rebound rotational speed of the motor in the second rotation direction based on the external rebound force;

[0093] Instead of detecting the initial position of the motor rotor, the control module directly controls the motor to continue rotating in the second rotation direction based on the rebound speed through the execution module, and increases the speed in the second rotation direction to the target speed.

[0094] In some more specific embodiments, the control module directly controls the motor to continue rotating in the second rotation direction based on the rebound speed through the execution module, and increasing the speed in the second rotation direction to the target speed may specifically include:

[0095] When the rebound speed is higher than the set speed threshold, the control module directly increases the speed in the second rotation direction from the rebound speed to the target speed.

[0096] In some other embodiments, before triggering the overload protection, the control module controls the motor to rotate in the first rotation direction through the execution module, and gradually increases the speed in the first rotation direction until the target speed is reached.

[0097] In another embodiment of the present invention, there is also provided a power tool machine, which includes the control system as described above.

[0098] In some embodiments of the present invention, the power tool machine can be an electric scissors; in some other embodiments, the power tool machine can be a pipe cutting machine; in some other embodiments, the power tool machine can also be a rivet gun, or it can also be other power tool machines known to those skilled in the art in which the motor drives the tool head to perform reciprocating motion through forward and reverse rotations.

[0099] It can be understood that the power tool machine has the same beneficial effects as the control system and method described in the present invention.

[0100] It should also be noted that the term "comprising" or "including" or any other variant thereof in the present invention is intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, commodity or device. Without further limitation, the element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, commodity or device including the element.

[0101] Those skilled in the art should understand that the technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered to be within the scope described in this specification.

[0102] The above-described embodiments merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all fall within the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A control method for a power tool, comprising the steps of: S1: When an overload protection is triggered, controlling the motor of the power tool to immediately stop rotating in the first rotation direction; S2: After the overload protection is triggered, the motor rotates in a second rotation direction opposite to the first rotation direction under the action of an external rebounding force, controlling the motor to continue rotating in the second rotation direction, and increasing the rotational speed in the second rotation direction, so that the tool head moves to a terminal position in the second direction under the driving action of the motor.

2. The control method for a power tool according to claim 1, wherein the motor of the power tool adopts sensorless starting; wherein controlling the motor to continue rotating in the second rotation direction and increasing the rotational speed in the second rotation direction specifically comprises the steps of: Obtaining the rebounding rotational speed of the motor in the second rotation direction based on the external rebounding force; Without performing an initial position detection of the motor rotor, directly controlling the motor to continue rotating in the second rotation direction based on the rebounding rotational speed, and increasing the rotational speed in the second rotation direction to a target rotational speed.

3. The control method for a power tool according to claim 2, wherein directly controlling the motor to continue rotating in the second rotation direction based on the rebounding rotational speed and increasing the rotational speed in the second rotation direction to a target rotational speed specifically comprises the steps of: When the rebounding rotational speed is higher than a set rotational speed threshold, directly increasing the rotational speed in the second rotation direction from the rebounding rotational speed to the target rotational speed.

4. The control method for a power tool according to claim 1, which comprises the steps before the overload protection is triggered: Controlling the motor to rotate in the first rotation direction, and gradually increasing the rotational speed in the first rotation direction until a target speed is reached, so as to drive a tool head connected to the motor to act in a first direction opposite to the second direction to process a workpiece to be processed.

5. A control system for a power tool, comprising: A control module; An execution module, which is connected to the control module to receive a control signal from the control module; The execution module is used to be connected to the motor of the power tool; An overload detection module, which is connected to the control module, and the overload detection module transmits the detected overload state data of the motor to the control module; A rotational speed detection module, which is connected to the control module, and the rotational speed detection module transmits the detected rotational speed of the motor to the control module; Wherein, when the overload detection module detects that the motor reaches an overload protection state, the control module makes the motor immediately stop rotating in the first rotation direction through the execution module; wherein the rotation of the motor in the first rotation direction is used to drive a tool head connected to the motor to perform an action to process a workpiece to be processed; After the overload protection is triggered, the motor rotates in a second rotation direction opposite to the first rotation direction under the action of an external rebounding force, and the control module controls the motor to continue rotating in the second rotation direction through the execution module, and increases the rotational speed in the second rotation direction, so that the tool head moves to a terminal position in the second direction under the driving action of the motor.

6. The control system for a power tool machine as claimed in claim 5, wherein the control module performs sensorless starting control on the motor of the power tool machine; the control module controls the motor to continue rotating in the second rotation direction through the execution module, and increasing the rotation speed in the second rotation direction specifically includes: The control module obtains the rebound rotation speed of the motor in the second rotation direction based on the external rebound force. The control module does not perform initial position detection of the motor rotor, and the control module directly controls the motor to continue rotating in the second rotation direction through the execution module based on the rebound rotation speed, and increases the rotation speed in the second rotation direction to the target rotation speed.

7. The control system for a power tool machine as claimed in claim 6, wherein the control module directly controls the motor to continue rotating in the second rotation direction through the execution module based on the rebound rotation speed, and increasing the rotation speed in the second rotation direction to the target rotation speed specifically includes: When the rebound rotation speed is higher than the set rotation speed threshold, the control module directly increases the rotation speed in the second rotation direction from the rebound rotation speed to the target rotation speed.

8. The control system for a power tool machine as claimed in claim 5, wherein before triggering overload protection, the control module controls the motor to rotate in the first rotation direction through the execution module, and gradually increases the rotation speed in the first rotation direction until the target speed is reached.

9. The control system for a power tool machine as claimed in claim 5, wherein the control module includes an MCU; and / or the execution module includes a plurality of MOS transistors; and / or the rotation speed detection module includes a back electromotive force detection circuit.

10. The control system for a power tool machine as claimed in claim 5, wherein the overload detection module includes a current detection sensor, which detects the current of the motor as overload state data for transmission to the control module.

11. A power tool machine, which includes the control system as claimed in any one of claims 5-10.

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