Power tool and control method thereof

Abstract

The embodiment of the present application discloses an electric tool and a control method thereof. The electric tool can solve the problem that the existing electric tool cannot close the functional part when the alarm stops, causing a safety hazard, and the like, so that the electric tool, in the starting or working process, acquires first electric parameter information of a power supply, and controls the motor to stop rotating when the first electric parameter is less than or equal to a first parameter threshold value; wherein the first parameter threshold value is greater than a standard parameter threshold value, so as to ensure that the electric parameter of the power supply is still greater than the standard parameter threshold value after the motor stops rotating, thereby enabling the electric tool to close the cutting unit again under the control of the user after the alarm stops, so as to avoid causing a safety accident, and providing a safe working environment for the electric tool and the user.

Description

Technical Field

[0001] This invention relates to the field of power tool control technology, and more particularly to a power tool and its control method. Background Technology

[0002] With the development of power tools, intelligent control technology for power tools is being used more and more widely. For example, controllers are used to adjust the voltage and speed of the motor to achieve characteristics such as rapid start-up and smooth braking of power tools.

[0003] However, existing power tools often trigger alarms and shutdowns when malfunctions occur, such as low battery voltage or overheating. This shutdown can disrupt the closure of functional components. For example, in the case of a pipe cutter, after an alarm shutdown, the blades may not close properly when the user operates the switch again, potentially remaining suspended in mid-air. This unclosed state poses a safety hazard to the user. Summary of the Invention

[0004] This invention provides an electric tool and its control method to achieve start-stop control of the electric tool, thereby providing a safe working environment for the electric tool and the user.

[0005] In a first aspect, embodiments of the present invention provide an electric tool, the electric tool comprising:

[0006] A power source for providing power to the power tools;

[0007] A cutting unit, used to cut the target workpiece;

[0008] An electric motor is used to provide driving power to the cutting unit;

[0009] The first detection unit is electrically connected to the power supply and is used to detect and obtain the first electrical parameter during the discharge process of the power supply.

[0010] The controller is electrically connected to the motor and the first detection unit;

[0011] The controller is configured to:

[0012] Obtain the first electrical parameters of the power supply;

[0013] When the first electrical parameter is less than or equal to a first parameter threshold, the motor is controlled to stop rotating; wherein the first parameter threshold is greater than a standard parameter threshold.

[0014] Optionally, the power tool further includes: a second detection unit, electrically connected to the motor, for detecting and obtaining a second electrical parameter during the operation of the motor;

[0015] The controller is configured to:

[0016] The load state of the motor is determined based on the second electrical parameter;

[0017] When the motor is under load, if the first electrical parameter is less than or equal to the first parameter threshold, the motor is controlled to stop rotating.

[0018] When the motor is in an unloaded state, the motor is controlled to stop rotating when the first electrical parameter is less than or equal to the second parameter threshold.

[0019] Wherein, the first parameter threshold is greater than the second parameter threshold; and the second parameter threshold is greater than the standard parameter threshold.

[0020] Optionally, the standard parameter threshold is the undervoltage threshold of the power supply's minimum discharge capability.

[0021] Optionally, the power tool further includes a third detection unit, electrically connected to the power supply, for detecting and obtaining a third electrical parameter during the power supply's discharge process;

[0022] The controller is also configured to:

[0023] Obtain the third electrical parameter of the power supply;

[0024] When the first electrical parameter is greater than the first parameter threshold and the third electrical parameter is greater than or equal to the third parameter threshold, the motor is controlled to stop rotating;

[0025] When the first electrical parameter is less than or equal to the first parameter threshold and the third electrical parameter is greater than or equal to the fourth parameter threshold, the motor is controlled to stop rotating.

[0026] Optionally, the third parameter threshold is greater than the fourth parameter threshold.

[0027] Secondly, embodiments of the present invention also provide a control method for an electric tool, the control method of which is executed by the electric tool, the electric tool comprising: a power supply for providing power to the electric tool; a cutting unit for cutting a target workpiece; a motor for providing driving power to the cutting unit; a first detection unit electrically connected to the power supply for detecting and obtaining a first electrical parameter during the discharge process of the power supply; and a controller electrically connected to the motor and the first detection unit.

[0028] The control method includes:

[0029] Obtain the first electrical parameters of the power supply;

[0030] When the first electrical parameter is less than or equal to a first parameter threshold, the motor is controlled to stop rotating; wherein the first parameter threshold is greater than a standard parameter threshold.

[0031] Optionally, the power tool further includes: a second detection unit, electrically connected to the motor, for detecting and obtaining a second electrical parameter during the operation of the motor;

[0032] The control method further includes:

[0033] The load state of the motor is determined based on the second electrical parameter;

[0034] When the motor is under load, if the first electrical parameter is less than or equal to the first parameter threshold, the motor is controlled to stop rotating.

[0035] When the motor is in an unloaded state, the motor is controlled to stop rotating when the first electrical parameter is less than or equal to the second parameter threshold; wherein the first parameter threshold is greater than the second parameter threshold; and the second parameter threshold is greater than the standard parameter threshold.

[0036] Optionally, the standard parameter threshold is the undervoltage threshold of the power supply's minimum discharge capability.

[0037] Optionally, the power tool further includes: a third detection unit, electrically connected to the power supply, for detecting and obtaining a third electrical parameter during the power supply discharge process;

[0038] The control method further includes:

[0039] Obtain the third electrical parameter of the power supply;

[0040] When the first electrical parameter is greater than the first parameter threshold and the third electrical parameter is greater than or equal to the third parameter threshold, the motor is controlled to stop rotating;

[0041] When the first electrical parameter is less than the first parameter threshold and the third electrical parameter is greater than or equal to the fourth parameter threshold, the motor is controlled to stop rotating.

[0042] Optionally, the third parameter threshold is greater than the fourth parameter threshold.

[0043] This invention provides a power tool and its control method. This power tool addresses the safety hazards caused by the inability to close functional components when an alarm occurs and the tool shuts down. During startup or operation, the power tool acquires first electrical parameter information from the power supply. When this first electrical parameter is less than or equal to a first parameter threshold, the power tool controls the motor to stop rotating. The first parameter threshold is greater than a standard parameter threshold to ensure that the power supply's electrical parameters remain above the standard threshold after the motor stops. This allows the power tool to close its cutting unit under user control after an alarm shutdown, preventing accidents and providing a safe working environment for both the power tool and the user. Attached Figure Description

[0044] Figure 1 This is a circuit structure block diagram of an electric tool according to an embodiment of the present invention;

[0045] Figure 2 This is a schematic diagram of the structure of a pipe cutting machine according to an embodiment of the present invention;

[0046] Figure 3 This is a circuit structure block diagram of another power tool in an embodiment of the present invention;

[0047] Figure 4 This is a flowchart of a power tool control method according to an embodiment of the present invention;

[0048] Figure 5 This is a flowchart of another power tool control method in an embodiment of the present invention. Detailed Implementation

[0049] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0050] Figure 1 This is a circuit structure block diagram of a power tool according to an embodiment of the present invention. Figure 2 This is a schematic diagram of a pipe cutting machine according to an embodiment of the present invention. (Reference) Figure 1The power tool includes: a power supply 10 for providing power to the power tool; a cutting unit 20 for cutting a target workpiece; a motor 30 for providing driving power to the cutting unit 20; a first detection unit 40 electrically connected to the power supply 10 for detecting and obtaining a first electrical parameter during the discharge process of the power supply 10; and a controller 50 electrically connected to the motor 30 and the first detection unit 40. The controller 50 is configured to: acquire the first electrical parameter of the power supply 10; and control the motor 30 to stop rotating when the first electrical parameter is less than or equal to a first parameter threshold; wherein the first parameter threshold is greater than a standard parameter threshold.

[0051] The power supply 10 can be a battery pack, electrically connected to the motor 30, to provide power to the power tool. The motor 30 is electrically connected to the cutting unit 20, providing driving power to the cutting unit 20; the motor 30 can be a DC motor. The operation of the motor 30 includes a start-up process and a working process. The first detection unit 40 is electrically connected to both the power supply 10 and the controller 50, and is used to detect and obtain a first electrical parameter of the power supply 10 and send it to the controller 50. The controller 50 receives the first electrical parameter and compares it with a first parameter threshold. When the first electrical parameter is less than or equal to the first parameter threshold, it controls the motor 30 to stop rotating.

[0052] The first electrical parameter can be the supply voltage information of the power supply 10, such as a first voltage; correspondingly, the first parameter threshold and the standard parameter threshold can be preset voltage thresholds, such as a first voltage threshold and a standard voltage threshold, respectively. Both the first voltage and the first voltage threshold are greater than the standard voltage threshold.

[0053] It should be noted that when the power tool stops and restarts due to a first electrical parameter being less than or equal to a first parameter threshold, the electrical parameter (e.g., voltage) of the power supply 10 is greater than the standard parameter threshold (correspondingly, for example, the standard voltage threshold), so that the power supply 10 is able to provide power to the cutting unit 20 to close the cutting unit 20.

[0054] In the technical solution of this embodiment, the power tool can be a tool with a tool head, such as a pipe cutter. For example, combined with... Figure 1 and Figure 2Taking a pipe cutter as an example, pipe cutters are typically used to cut metal pipes, plastic pipes, and wood blocks. However, when a fault occurs such as low battery voltage or overheating, the pipe cutter will alarm and shut down. After the alarm stops, when the user operates the switch again, the blade will not close, potentially leaving it suspended in mid-air. This unclosed blade state poses a serious safety hazard to the user. Therefore, the power tool provided by this invention can achieve the following: During the power tool's startup or operation, the first detection unit 40 detects and obtains the first electrical parameter of the power supply 10 in real time and sends it to the controller 50. The controller 50 receives the first electrical parameter of the power supply 10 and compares it with a first parameter threshold. When the first electrical parameter is less than or equal to the first parameter threshold, and the pipe is being cut, the motor 30 is controlled to stop rotating. Therefore, when the motor 30 stops rotating and restarts, the electrical parameters of the power supply 10 are still greater than the standard parameter threshold. This allows the power supply 10 to provide power to the cutting unit 20 when an alarm occurs and the machine restarts, so that the user can still operate the switch to close the cutting unit 20 and control the start and stop of the cutting unit, thus providing a safe working environment for the power tool and the user.

[0055] For example, Figure 2 A schematic diagram of a pipe cutting machine is shown. (Refer to...) Figure 2 The pipe cutter 100 includes a power supply 10, a cutting unit 20, a housing 11, a main switch 14, and a changeover switch 15. The housing 11 includes a tool section 12 and a handle section 13, with the power supply 10 connected to the handle section 13. Specifically, the power supply 10 can be a battery pack, which is detachably connected to the handle section 13. In other embodiments, it can also be an AC pipe cutter, which is not limited here. The housing 11 contains a transmission device and a drive device (not shown), and several switches or switch assemblies are provided on the housing. The tool section 12 also includes a support section 121, and the cutting unit 20 is connected to the tool section 12. The tool section 12 forms a cavity, and part of the transmission device is located within the cavity. The first end of the cutting unit 20 extends into the tool section 12 and is disposed in the first cavity, and the first end of the cutting unit 20 is connected to the transmission device. The second end and most of the cutting unit 20 extend out of the tool section 12 and are disposed opposite to the support section 121. The support portion 121 includes a positioning portion 122, which is at least one curved surface or groove. The positioning portion 122 is disposed opposite to the cutting unit 20, such that the support portion 121 is located on one side of the pipe to be cut, while the cutting unit 20 is located on the other side of the pipe. The positioning portion 122 is disposed against the outer wall of the pipe. The support portion 121 also has a first groove 122a for accommodating the cutting unit 20 after the cutting motion. Specifically, the opening of the first groove 122a is located at the positioning portion 122, facing the cutting unit 20, and the width of the first groove is slightly larger than the width of the cutting unit.

[0056] The cutting unit 20 is connected to the driving device via a transmission mechanism, which is controlled by a motor. Under the action of the driving device, the cutting unit 20 moves relative to the support part 121 between a first position and a second position, realizing a first movement and a second movement. The first movement is the cutting unit 20 moving from the second position to the first position, which in this embodiment completes a downward shearing action. The second movement is the cutting unit 20 moving from the first position to the second position, which in this embodiment completes an upward recovery action. Specifically, the first position is... Figure 2 The cutting unit 20 is positioned such that the distance between its edge and the positioning part 122 is greater than the diameter of the pipe to be cut. The second position is when the cutting unit 20 moves to the middle or bottom of the first groove 122a. Furthermore, the distance between the first and second positions should be greater than or equal to the diameter of the pipe to be cut, and at least greater than or equal to two-thirds of the pipe diameter, ensuring complete pipe cutting, or allowing the user to easily break off the cut pipe segment after cutting.

[0057] The technical solution of this embodiment provides an electric tool that solves the problem of existing electric tools failing to close their functional components when an alarm occurs, thus causing safety hazards. During startup or operation, the electric tool acquires first electrical parameter information from the power supply and controls the motor to stop rotating when the first electrical parameter is less than or equal to a first parameter threshold. The first parameter threshold is greater than a standard parameter threshold to ensure that the power supply's electrical parameters remain greater than the standard parameter threshold after the motor stops. This allows the electric tool to close its cutting unit under user control after an alarm shutdown, preventing accidents and providing a safe working environment for both the electric tool and the user.

[0058] As one implementation method, Figure 3 This is a circuit structure block diagram of another power tool provided in an embodiment of the present invention. Optionally, refer to... Figure 3 The power tool also includes: a second detection unit 60, which is electrically connected to the motor 30, for detecting and obtaining a second electrical parameter during the operation of the motor 30;

[0059] Controller 50 is configured as follows:

[0060] The load state of motor 30 is determined based on the second electrical parameter;

[0061] When the motor 30 is under load, the motor 30 is controlled to stop rotating when the first electrical parameter is less than or equal to the first parameter threshold.

[0062] When the motor 30 is in an unloaded state, the motor 30 is controlled to stop rotating when the first electrical parameter is less than or equal to the threshold of the second parameter.

[0063] Among them, the threshold of the first parameter is greater than the threshold of the second parameter; the threshold of the second parameter is greater than the threshold of the standard parameter.

[0064] The second detection unit 60 is electrically connected to the motor 30 and the controller 50 respectively. It is used to detect and obtain the second electrical parameters of the motor 30 in real time and send them to the controller 50. The controller 50 receives the second electrical parameters and determines the load state of the motor 30 based on the second electrical parameters.

[0065] The first electrical parameter is the supply voltage information of power supply 10, and the second electrical parameter can be the motor speed information, current information, etc. The motor speed and / or motor current can be used to determine whether the motor is under load. For example, if the motor speed is greater than a first preset speed and / or the current is greater than a first preset current, the controller 50 can determine that the motor 30 is under load; if the motor speed is less than the first preset speed and / or the current is less than the first preset current, the controller 50 can determine that the motor 30 is under no-load. Other determination methods are also possible, and specific settings can be made according to actual conditions; no specific limitations are made here. The first detection unit 40 can be a voltage sensor, and the second detection unit 60 can include a current transformer and / or a speed sensor.

[0066] For example, in combination Figure 2 and Figure 3Taking a pipe cutter as an example, pipe cutters are typically used to cut metal pipes, plastic pipes, and wood blocks. However, when a fault occurs, such as low battery voltage or overheating, the pipe cutter will alarm and shut down. After the alarm stops, when the user operates the switch again, the blade will not close, potentially leaving it suspended in mid-air. This unclosed blade state poses a serious safety hazard to the user. Therefore, the power tool provided by this invention can achieve the following: during the startup or operation of the power tool, the first detection unit 40 detects and obtains the first electrical parameters of the power supply 10 in real time and sends them to the controller 50; the second detection unit 60 detects and obtains the second electrical parameters of the motor 30 in real time and sends them to the controller 50; the controller 50 receives the first electrical parameters of the power supply 10 and the second electrical parameters of the motor 30, and determines the load status of the motor 30 based on the second electrical parameters. When it is determined that the motor 30 is under load, the first electrical parameters are compared with a first parameter threshold. When the first electrical parameters are less than or equal to the first parameter threshold, the motor 30 is controlled to stop rotating; when it is determined that the motor 30 is under no-load, the first electrical parameters are compared with the second parameter threshold. When the first electrical parameters are less than or equal to the second parameter threshold, the motor 30 is controlled to stop rotating. Wherein, the first parameter threshold is greater than the second parameter threshold; the second parameter threshold is greater than a standard parameter threshold. Therefore, it is possible to combine the electrical parameters of the power supply 10 with the load conditions of the motor 30 during the startup or operation of the power tool, so that when the motor 30 stops (e.g., alarm shutdown) and restarts, the electrical parameters of the power supply 10 are still greater than the standard parameter threshold. This ensures that even when an alarm shutdown occurs, the cutting unit 20 can still be closed under the user's control to prevent safety accidents, thus providing a safe working environment for the power tool and the user.

[0067] Optionally, the standard parameter threshold is the undervoltage threshold of the minimum discharge capability of power supply 10.

[0068] When the electrical parameters of power supply 10 are lower than the standard parameter threshold, power supply 10 is in an undervoltage state and cannot provide power to motor 30. Motor 30 also cannot provide driving capability to cutting unit 20, which leads to the cutting unit 20 failing to close when motor 30 stops and restarts. Therefore, both the first and second parameter thresholds are set to be greater than the standard parameter threshold, ensuring that when the motor stops and restarts, the electrical parameters of power supply 10 are always greater than the standard parameter threshold, thus providing power to cutting unit 20 to operate the switch and close cutting unit 20.

[0069] Optionally, continue to refer to Figure 3 The power tool also includes a third detection unit 70, which is electrically connected to the power supply 10 and is used to detect and obtain a third electrical parameter during the discharge process of the power supply 10.

[0070] Controller 50 is also configured as follows:

[0071] Obtain the third electrical parameter of power supply 10;

[0072] When the first electrical parameter is greater than the first parameter threshold and the third electrical parameter is greater than or equal to the third parameter threshold, the motor 30 is controlled to stop rotating.

[0073] When the first electrical parameter is less than the first parameter threshold and the third electrical parameter is greater than or equal to the fourth parameter threshold, the control motor 30 stops rotating.

[0074] The first electrical parameter is the supply voltage information of power supply 10, the third electrical parameter is the current information of power supply 10, the third parameter threshold is the first overcurrent protection threshold of power supply 10, and the fourth parameter threshold is the second overcurrent protection threshold of power supply 10. The first detection unit 40 can be a voltage sensor, and the third detection unit 70 can be a current transformer.

[0075] The third detection unit 70 is electrically connected to both the power supply 10 and the controller 50. It detects and obtains the third electrical parameter of the power supply 10 in real time and sends it to the controller 50. The controller 50 receives the third electrical parameter and compares it with both the first and third electrical parameters. If the first electrical parameter is greater than the first threshold and the third electrical parameter is greater than or equal to the third threshold, the cutting unit may be jammed. For example, if the workpiece is too hard, the blade may jam. In this case, overcurrent protection needs to be activated, i.e., the motor 30 is stopped. If the first electrical parameter is less than the first threshold and the third electrical parameter is greater than or equal to the fourth threshold, overcurrent protection is activated, i.e., the motor 30 is stopped. Understandably, in this case, the cutting unit is not jammed; it is a normal overcurrent protection shutdown triggered by low battery power. In summary: During the startup or operation of the power tool, the electrical parameters of the power supply 10 are combined with the overcurrent condition of the motor 30 to ensure that the power supply 10 stops when the current reaches the overcurrent protection point, and that the electrical parameters of the power supply 10 are still greater than the standard parameter threshold when restarted. This ensures that the cutting unit 20 can still be closed under the user's control after the overcurrent protection shutdown to prevent safety accidents, thus providing a safe working environment for the power tool and the user.

[0076] Optionally, the threshold for the third parameter is greater than the threshold for the fourth parameter.

[0077] Figure 4This is a flowchart of a control method for an electric tool provided in an embodiment of the present invention. This embodiment is applicable to the implementation process of a control method for an electric tool. The method can be executed by the electric tool provided in this embodiment of the present invention. The electric tool includes: a power supply for providing power to the electric tool; a cutting unit for cutting a target workpiece; a motor for providing driving power to the cutting unit; a first detection unit electrically connected to the power supply for detecting and obtaining first electrical parameters during the power supply discharge process; and a controller electrically connected to the motor and the first detection unit; (Reference) Figure 4 The control method for this power tool specifically includes the following steps:

[0078] Step 110: Obtain the first electrical parameters of the power supply;

[0079] Specifically, the power tool includes at least a motor, a first detection unit, and a controller. The first detection unit is electrically connected to both the power supply and the controller, and is used to detect and obtain the first electrical parameters of the power supply in real time and send them to the controller.

[0080] Step 120: When the first electrical parameter is less than or equal to the first parameter threshold, control the motor to stop rotating; wherein the first parameter threshold is greater than the standard parameter threshold.

[0081] Specifically, the controller receives the first electrical parameter of the power supply and compares it with a first parameter threshold. When the first electrical parameter is less than or equal to the first parameter threshold, the controller stops the motor. This ensures that when the motor stops and restarts, the power supply's electrical parameter is still greater than the standard parameter threshold. This allows the cutting unit to be closed again under user control after an alarm shutdown to prevent accidents and provide a safe working environment for power tools and users.

[0082] This embodiment provides a power tool control method. The power tool control method is executed by a power tool, which includes: a power supply for providing power to the power tool; a cutting unit for cutting a target workpiece; a motor for providing driving power to the cutting unit; a first detection unit electrically connected to the power supply for detecting and obtaining a first electrical parameter during the power supply's discharge process; and a controller electrically connected to the motor and the first detection unit. The control method includes: acquiring the first electrical parameter of the power supply; and controlling the motor to stop rotating when the first electrical parameter is less than or equal to a first parameter threshold; wherein the first parameter threshold is greater than a standard parameter threshold. This power tool control method solves the safety hazard caused by the inability of existing power tools to close their functional components when an alarm occurs and the machine stops. During startup or operation, the power tool acquires first electrical parameter information and controls the motor to stop rotating when this first parameter is less than or equal to a first parameter threshold. This first parameter threshold is greater than a standard parameter threshold, ensuring that the power supply's electrical parameters remain above the standard threshold after the motor stops. This allows the power tool to close its cutting unit again under user control after an alarm shutdown, preventing accidents and providing a safe working environment for both the power tool and the user.

[0083] Figure 5 This is a flowchart of another control method for a power tool provided in an embodiment of the present invention. Optionally, the power tool further includes: a second detection unit, electrically connected to the motor, used to detect and obtain a second electrical parameter during the operation of the motor;

[0084] refer to Figure 5 The control method includes the following steps:

[0085] Step 210: Obtain the first electrical parameters of the power supply and the second electrical parameters during motor operation;

[0086] Specifically, the power tool includes at least a motor, a first detection unit, a second detection unit, and a controller. The first detection unit is electrically connected to both the power supply and the controller, and is used to detect and obtain the first electrical parameters of the power supply in real time and send them to the controller. The second detection unit is electrically connected to both the motor and the controller, and is used to detect and obtain the second electrical parameters of the motor in real time during operation.

[0087] Step 220: Determine the motor's load status based on the second electrical parameter;

[0088] The second electrical parameter can be the motor's speed and current information, etc. The motor's speed and / or current can be used to determine whether the motor is under load.

[0089] Step 230: When the motor is under load, control the motor to stop rotating when the first electrical parameter is less than or equal to the first parameter threshold.

[0090] Specifically, the controller receives the first electrical parameter from the power supply and the second electrical parameter during motor operation, and determines the motor's load status based on the second electrical parameter. When it is determined that the motor is under load, the first electrical parameter is compared with a first parameter threshold. If the first electrical parameter is less than or equal to the first parameter threshold, the motor is controlled to stop rotating. Thus, during the startup or operation of the power tool, the power supply's electrical parameters are combined with the motor's load status to ensure that when the motor stops (e.g., due to an alarm shutdown) and restarts, the power supply's electrical parameters remain above the standard parameter threshold. This allows the cutting unit to be closed again under user control even after an alarm shutdown, preventing safety accidents and providing a safe working environment for the power tool and the user.

[0091] Step 240: When the motor is in an unloaded state, control the motor to stop rotating when the first electrical parameter is less than or equal to the second parameter threshold; wherein, the first parameter threshold is greater than the second parameter threshold; and the second parameter threshold is greater than the standard parameter threshold.

[0092] Specifically, the controller receives the first electrical parameters of the power supply and the second electrical parameters during motor operation, and determines the motor's load status based on the second electrical parameters. When it is determined that the motor is in an unloaded state, the first electrical parameters are compared with the second parameter threshold. When the first electrical parameter is less than or equal to the second parameter threshold, the motor is controlled to stop rotating. Thus, during the startup or operation of the power tool, the power supply's electrical parameters are combined with the motor's load status to ensure that when the motor stops (e.g., due to an alarm shutdown) and restarts, the power supply's electrical parameters are still greater than the standard parameter threshold. This allows the cutting unit to be closed again under user control even after an alarm shutdown, preventing safety accidents and providing a safe working environment for the power tool and the user. Optionally, the standard parameter threshold is the undervoltage threshold of the power supply's minimum discharge capability.

[0093] Optionally, the power tool further includes: a third detection unit, electrically connected to the power supply, for detecting and obtaining a third electrical parameter during the power supply discharge process;

[0094] Control methods also include:

[0095] Obtain the third electrical parameter of the power supply;

[0096] When the first electrical parameter is greater than the first parameter threshold and the third electrical parameter is greater than or equal to the third parameter threshold, the motor is controlled to stop rotating.

[0097] When the first electrical parameter is less than the first parameter threshold and the third electrical parameter is greater than or equal to the fourth parameter threshold, the motor is controlled to stop rotating.

[0098] Optionally, the threshold for the third parameter is greater than the threshold for the fourth parameter.

[0099] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A power tool, characterized in that, include: A power source for providing power to the power tools; A cutting unit, used to cut the target workpiece; An electric motor is used to provide driving power to the cutting unit; The first detection unit is electrically connected to the power supply and is used to detect and obtain the first electrical parameter during the discharge process of the power supply. The controller is electrically connected to the motor and the first detection unit; The controller is configured to: Obtain the first electrical parameters of the power supply; When the first electrical parameter is less than or equal to a first parameter threshold, the motor is controlled to stop rotating; wherein the first parameter threshold is greater than a standard parameter threshold. When the motor stops rotating and restarts, if the first electrical parameter of the power supply is greater than the standard parameter threshold, the power supply provides power to the cutting unit to make the cutting unit close; the standard parameter threshold is the undervoltage threshold of the power supply's minimum discharge capability.

2. The power tool according to claim 1, characterized in that, Also includes: The second detection unit is electrically connected to the motor and is used to detect and obtain the second electrical parameter during the operation of the motor. The controller is configured to: The load state of the motor is determined based on the second electrical parameter; When the motor is under load, if the first electrical parameter is less than or equal to the first parameter threshold, the motor is controlled to stop rotating. When the motor is in an unloaded state, the motor is controlled to stop rotating when the first electrical parameter is less than or equal to the second parameter threshold. Wherein, the first parameter threshold is greater than the second parameter threshold; The second parameter threshold is greater than the standard parameter threshold.

3. The power tool according to claim 1, characterized in that, It also includes a third detection unit, which is electrically connected to the power supply, for detecting and obtaining a third electrical parameter during the discharge process of the power supply; The controller is also configured to: Obtain the third electrical parameter of the power supply; When the first electrical parameter is greater than the first parameter threshold and the third electrical parameter is greater than or equal to the third parameter threshold, the motor is controlled to stop rotating; When the first electrical parameter is less than or equal to the first parameter threshold and the third electrical parameter is greater than or equal to the fourth parameter threshold, the motor is controlled to stop rotating.

4. The power tool according to claim 3, characterized in that, The threshold value of the third parameter is greater than the threshold value of the fourth parameter.

5. A control method for an electric tool, characterized in that, Performed by an electric tool, the electric tool comprising: a power supply for providing power to the electric tool; a cutting unit for cutting a target workpiece; a motor for providing driving power to the cutting unit; a first detection unit electrically connected to the power supply for detecting and obtaining a first electrical parameter during the discharge process of the power supply; and a controller electrically connected to the motor and the first detection unit. The control method includes: Obtain the first electrical parameters of the power supply; When the first electrical parameter is less than or equal to a first parameter threshold, the motor is controlled to stop rotating; wherein the first parameter threshold is greater than a standard parameter threshold. When the motor stops rotating and restarts, if the first electrical parameter of the power supply is greater than the standard parameter threshold, the power supply provides power to the cutting unit to make the cutting unit close; the standard parameter threshold is the undervoltage threshold of the power supply's minimum discharge capability.

6. The control method for power tools according to claim 5, characterized in that, The power tool further includes: a second detection unit, electrically connected to the motor, used to detect and obtain a second electrical parameter during the operation of the motor; The control method further includes: The load state of the motor is determined based on the second electrical parameter; When the motor is under load, if the first electrical parameter is less than or equal to the first parameter threshold, the motor is controlled to stop rotating. When the motor is in an unloaded state, the motor is controlled to stop rotating when the first electrical parameter is less than or equal to the second parameter threshold; wherein the first parameter threshold is greater than the second parameter threshold; and the second parameter threshold is greater than the standard parameter threshold.

7. The control method for power tools according to claim 5, characterized in that, The power tool further includes: a third detection unit, electrically connected to the power supply, used to detect and obtain a third electrical parameter during the power supply discharge process; The control method further includes: Obtain the third electrical parameter of the power supply; When the first electrical parameter is greater than the first parameter threshold and the third electrical parameter is greater than or equal to the third parameter threshold, the motor is controlled to stop rotating; When the first electrical parameter is less than the first parameter threshold and the third electrical parameter is greater than or equal to the fourth parameter threshold, the motor is controlled to stop rotating.

8. The control method for power tools according to claim 7, characterized in that, The threshold value of the third parameter is greater than the threshold value of the fourth parameter.

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