CN116614044A - Electric tool and control method thereof - Google Patents

Electric tool and control method thereof Download PDF

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Publication number
CN116614044A
CN116614044A CN202210118391.1A CN202210118391A CN116614044A CN 116614044 A CN116614044 A CN 116614044A CN 202210118391 A CN202210118391 A CN 202210118391A CN 116614044 A CN116614044 A CN 116614044A
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China
Prior art keywords
current
power supply
motor
electrical parameter
parameter
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CN202210118391.1A
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Chinese (zh)
Inventor
濮维涛
林攀
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Nanjing Chervon Industry Co Ltd
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Nanjing Chervon Industry Co Ltd
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Priority to CN202210118391.1A priority Critical patent/CN116614044A/en
Publication of CN116614044A publication Critical patent/CN116614044A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
    • H02P23/14—Estimation or adaptation of motor parameters, e.g. rotor time constant, flux, speed, current or voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
    • H02P23/20—Controlling the acceleration or deceleration
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Electric Motors In General (AREA)

Abstract

The embodiment of the invention discloses an electric tool and a control method thereof. The electric tool can solve the problems of brake failure caused by uncontrollable brake current, excessive motor pressure and the like of the existing electric tool due to the change of temperature, internal resistance and the like of the electric tool or a battery pack, and can acquire the current first electric parameter of a power supply and the current second electric parameter of a motor control circuit in the working process of the electric tool; determining a current third electrical parameter of the power supply according to the current first electrical parameter of the power supply; and when a brake signal is obtained, a control signal for adjusting the current voltage of the motor is regulated and output to the driving unit according to the current third electric parameter of the power supply and the current second electric parameter of the motor control circuit, so that the rotating speed of the motor is regulated to adjust the brake control of the electric tool, and the conditions of uncontrollable circuit current, overpressure, brake failure and the like are avoided.

Description

Electric tool and control method thereof
Technical Field
The embodiment of the invention relates to the technical field of electric tool control, in particular to an electric tool and a control method thereof.
Background
With the development of electric tools, intelligent control technology of the electric tools is increasingly widely used. For example, the voltage, the rotation speed and the like of the motor are regulated by the controller so as to realize the characteristics of quick start, stable brake and the like of the electric tool.
However, the existing electric tool has the problems that the braking current is uncontrollable and the motor is over-voltage and the like to cause braking failure due to the change of the temperature, the internal resistance and the like of the electric tool or a battery pack.
Disclosure of Invention
The invention provides an electric tool and a control method thereof, which are used for realizing braking control of the electric tool.
In a first aspect, an embodiment of the present invention provides a power tool including:
a motor;
the power supply is electrically connected with the motor and is used for providing power supply voltage for the motor;
the driving unit is electrically connected with the motor and used for driving and controlling the motor;
the first detection unit is electrically connected with the power supply and is used for detecting and obtaining the current first electric parameter of the power supply;
the second detection unit is electrically connected with the motor and is used for detecting and obtaining the current second electric parameter of the motor control circuit;
the controller is electrically connected with at least the motor, the first detection unit and the second detection unit;
the controller is configured to:
acquiring a current first electrical parameter of the power supply and a current second electrical parameter of the motor control circuit;
determining a current third electrical parameter of the power supply according to the current first electrical parameter of the power supply;
when a brake signal is acquired, a control signal for adjusting the current voltage of the motor is regulated and output to the driving unit according to the current third electric parameter of the power supply and the current second electric parameter of the motor control circuit.
Optionally, the first electrical parameter includes at least temperature information, internal resistance information, and a parallel number of the power supply.
Optionally, the current third electrical parameter of the power supply includes at least a current maximum feedback current of the power supply.
Optionally, the determining the current third electrical parameter of the power supply according to the current first electrical parameter of the power supply includes:
and determining a current third electrical parameter of the power supply according to the first electrical parameter of the power supply and a maximum feedback current comparison table of the power supply.
Optionally, the second electrical parameter includes at least: the motor controls the current of the line.
Optionally, the control signal is a PWM duty cycle or a PWM modulation frequency.
In a second aspect, an embodiment of the present invention also provides a control method of an electric tool, the control method of the electric tool being performed by the electric tool, the electric tool including: a motor; the power supply is electrically connected with the motor and is used for providing power supply voltage for the motor; the driving unit is electrically connected with the motor and used for driving and controlling the motor; the first detection unit is electrically connected with the power supply and is used for detecting and obtaining the current first electric parameter of the power supply; the second detection unit is electrically connected with the motor and is used for detecting and obtaining the current second electric parameter of the motor control circuit; the controller is electrically connected with at least the motor, the first detection unit and the second detection unit;
the control method comprises the following steps:
acquiring a current first electrical parameter of the power supply and a current second electrical parameter of the motor control circuit;
determining a current third electrical parameter of the power supply according to the current first electrical parameter of the power supply;
when a brake signal is acquired, a control signal for adjusting the current voltage of the motor is regulated and output to the driving unit according to the current third electric parameter of the power supply and the current second electric parameter of the motor control circuit.
Optionally, the first electrical parameter includes at least temperature information, internal resistance information, and a parallel number of the power supply.
Optionally, the current third electrical parameter of the power supply includes at least a current maximum feedback current of the power supply.
Optionally, the determining the current absorption capacity of the power supply according to the current first electrical parameter of the power supply includes:
and determining a current third electrical parameter of the power supply according to the first electrical parameter of the power supply and a maximum feedback current comparison table of the power supply.
The invention provides the electric tool and the control method thereof, and the electric tool can solve the problems of brake failure caused by uncontrollable brake current, excessive motor pressure and the like of the existing electric tool due to the change of the temperature, the internal resistance and the like of the electric tool or a battery pack, so that the electric tool can acquire the current first electric parameter of a power supply and the current second electric parameter of a motor control circuit in the working process; determining a current third electrical parameter of the power supply according to the current first electrical parameter of the power supply; and when a brake signal is obtained, a control signal for adjusting the current voltage of the motor is regulated and output to the driving unit according to the current third electric parameter of the power supply and the current second electric parameter of the motor control circuit, so that the rotating speed of the motor is regulated to adjust the brake control of the electric tool, and the conditions of uncontrollable circuit current, overpressure, brake failure and the like are avoided.
Drawings
FIG. 1 is a block diagram of a circuit configuration of a power tool according to an embodiment of the present invention;
fig. 2 is a flowchart of a control method of an electric tool according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
Fig. 1 is a block diagram of a circuit structure of an electric tool according to an embodiment of the present invention. Referring to fig. 1, the power tool includes: a motor 10; a power supply 20 electrically connected to the motor 10 for supplying a power supply voltage to the motor 10; a driving unit 30 electrically connected to the motor 10 for driving and controlling the motor 10; a first detecting unit 40 electrically connected to the power source 20, for detecting and obtaining a current first electrical parameter of the power source 20; a second detecting unit 50 electrically connected to the motor 10, for detecting a current second electrical parameter of the control line of the motor 10; a controller 60 electrically connected to at least the motor 10, the first detecting unit 40, and the second detecting unit 50; the controller 60 is configured to: acquiring a current first electrical parameter of the power supply 20 and a current second electrical parameter of the control circuit of the motor 10; determining a current third electrical parameter of the power supply 20 from the current first electrical parameter of the power supply 20; when the brake signal is acquired, a control signal for adjusting the current voltage of the motor 10 is output to the driving unit 30 according to the current third electric parameter of the power supply 20 and the current second electric parameter of the control line of the motor 10.
Wherein the motor 10 may be a dc motor; the power source 20 may be a battery pack electrically connected to the motor 10 for providing a supply voltage to the motor 10. The driving unit 30 may be a driver, and is electrically connected to the motor 10 and the controller 60, respectively, for controlling the rotation of the motor 10 according to a control signal output from the controller 60. The first detection unit 40 is electrically connected to the power supply 20 and the controller 60, and is used for detecting and obtaining a current first electrical parameter of the power supply 20 and sending the current first electrical parameter to the controller 60; the second detecting unit 50 is electrically connected to the motor 10 and the controller 60, respectively, and is configured to detect and obtain a current second electrical parameter of the motor control line and send the current second electrical parameter to the controller 60. The controller 60 is configured to receive a current first electrical parameter of the power supply 20 and a current second electrical parameter of the motor control circuit, and determine a current third electrical parameter of the power supply 20 based on the current first electrical parameter of the power supply 20. The controller 60 is further configured to, when a brake signal of the electric tool is obtained, adjust and output a control signal to the driving unit 30 according to a current third electrical parameter of the power supply 20 and a current second electrical parameter of the motor control circuit, and the driving unit 30 adjusts a current voltage of the motor 10 according to the control signal to adjust a rotation speed of the motor, thereby realizing brake control of the electric tool and avoiding occurrence of an overvoltage on the circuit.
Wherein, when the electric tool needs to be braked, the brake unit sends a brake signal to the controller 60. When the controller 60 acquires the braking signal, a control signal for adjusting the current voltage of the motor is output to the driving unit according to the current third electric parameter of the power supply and the current second electric parameter of the motor control circuit, so as to control the braking of the electric tool.
Alternatively, the first electrical parameter may include one or more combinations of temperature information, internal resistance information, and parallel numbers of the power supply. The second electrical parameter may include a current of the motor line. The third electrical parameter may be the absorption capacity of the power supply 20.
In the technical solution of the present embodiment, the electric tool may be a circular saw, a reciprocating saw, an angle mill, an electric wood milling machine, or the like. In general, the braking control of various electric tools mainly adopts a scheme of opening a lower bridge MOS and shorting a three-phase line brake, but the braking force is large, the braking current is uncontrollable, and thus the braking hand feeling is abrupt. To improve the above problem, a soft braking scheme is adopted, but when the electric tool is in a low temperature state, the capacity of the battery pack to absorb energy is reduced, which can lead to a great increase in the voltage of the motor bus, so that overvoltage protection must be added to prevent the voltage from breaking through the MOS transistor, but the complexity of design and the design and manufacturing cost are increased to some extent. The prior solution is mainly to close the drive, so that the motor can slide freely, and the brake energy is prevented from charging the bus. However, this solution causes a problem of failure of the electric tool brake at low temperatures. Therefore, the electric tool provided by the invention can realize the following steps: in the working process of the electric tool, the first detection unit 40 detects and obtains the current first electric parameter of the power supply 20 in real time and sends the current first electric parameter to the controller 60, the second detection unit 50 detects and obtains the current second electric parameter of the motor control circuit in real time and sends the current second electric parameter to the controller 60, the controller 60 generates the current third electric parameter of the power supply 20 according to the received current first electric parameter of the power supply 20, when the controller 60 receives a brake signal of the electric tool, the controller 60 adjusts and outputs a control signal for adjusting the current voltage of the motor to the driving unit 30 according to the current third electric parameter of the power supply 20 and the current second electric parameter of the motor control circuit, and the driving unit 30 adjusts the current voltage of the motor 10 according to the control signal so as to adjust the rotating speed of the motor, thereby realizing brake control of the electric tool, avoiding overvoltage, uncontrollable current, brake failure and the like of the circuit.
According to the technical scheme of the embodiment, the electric tool comprises: a motor; the power supply is electrically connected with the motor and is used for providing power supply voltage for the motor; the driving unit is electrically connected with the motor and used for driving and controlling the motor; the first detection unit is electrically connected with the power supply and is used for detecting and obtaining the current first electric parameter of the power supply; the second detection unit is electrically connected with the motor and is used for detecting and obtaining the current second electric parameter of the motor control circuit; the controller is electrically connected with at least the motor, the first detection unit and the second detection unit; the controller is configured to: acquiring a current first electrical parameter of a power supply and a current second electrical parameter of a motor control circuit; determining a current third electrical parameter of the power supply according to the current first electrical parameter of the power supply; when the brake signal is acquired, a control signal for adjusting the current voltage of the motor is adjusted and output to the driving unit according to the current third electric parameter of the power supply and the current second electric parameter of the motor control circuit. The electric tool can solve the problems of brake failure caused by uncontrollable brake current, excessive motor pressure and the like of the existing electric tool due to the change of temperature, internal resistance and the like of the electric tool or a battery pack, and can acquire the current first electric parameter of a power supply and the current second electric parameter of a motor control circuit in the working process of the electric tool; determining a current third electrical parameter of the power supply according to the current first electrical parameter of the power supply; and when a brake signal is obtained, a control signal for adjusting the current voltage of the motor is regulated and output to the driving unit according to the current third electric parameter of the power supply and the current second electric parameter of the motor control circuit, so that the rotating speed of the motor is regulated to adjust the brake control of the electric tool, and the conditions of uncontrollable circuit current, overpressure, brake failure and the like are avoided.
Optionally, the first electrical parameter includes at least temperature information, internal resistance information, and a parallel number of the power supply.
The first electrical parameter may be one or more of temperature information, internal resistance information and parallel number of the power supply. Other parameters may be set specifically according to practical situations, and are not specifically limited herein.
Optionally, the current third electrical parameter of the power supply comprises at least a current maximum feedback current of the power supply.
The current third electrical parameter of the power supply is the current absorption capacity of the power supply, and the absorption capacity of the power supply can be represented by the maximum feedback current of the power supply.
Optionally, determining the current third electrical parameter of the power supply from the current first electrical parameter of the power supply comprises:
and determining a current third electrical parameter of the power supply according to the first electrical parameter of the power supply and the maximum feedback current comparison table of the power supply.
Specifically, the first electrical parameter of the power supply is known, and according to the first electrical parameter of the power supply and the maximum feedback current comparison table of the power supply, the corresponding maximum feedback current of the power supply can be determined, so that the current third electrical parameter of the power supply (i.e. the current absorption capacity of the power supply) can be determined. The comparison table of the first electrical parameter of the power supply and the maximum feedback current of the power supply can be set according to practical situations, and is not limited herein.
It should be noted that, when the first electrical parameter of the power supply is the temperature information of the power supply, the current temperature information of the power supply is known, and the current third electrical parameter of the power supply (i.e. the current absorption capacity of the power supply) can be determined according to the temperature information of the power supply and the maximum feedback current comparison table of the power supply; when the first electrical parameter of the power supply is the internal resistance information of the power supply, knowing the current internal resistance information of the power supply, and determining the current third electrical parameter of the power supply (namely the current absorption capacity of the power supply) according to the internal resistance information of the power supply and the maximum feedback current comparison table of the power supply; when the first electrical parameter of the power supply is the parallel number of the power supply, knowing the current parallel number of the power supply, and determining the current third electrical parameter of the power supply (namely the current absorption capacity of the power supply) according to the parallel number of the power supply and the maximum feedback current comparison table of the power supply; similarly, when the first electrical parameter of the power supply is a combination of multiple types of temperature information, internal resistance information and parallel number of the power supply, the temperature information, internal resistance information and parallel number of the power supply are known, and the current third electrical parameter (i.e. the current absorption capacity of the power supply) of the power supply can be determined according to one or more combinations of the temperature information of the power supply and the maximum feedback current comparison table of the power supply, the internal resistance information of the power supply and the maximum feedback current comparison table of the power supply, the parallel number of the power supply and the maximum feedback current comparison table of the power supply, and a specific combination query mode can be set according to actual conditions, which is not limited in detail herein.
Optionally, the second electrical parameter comprises at least: the motor controls the current of the line.
Specifically, the controller acquires the current first electrical parameter of the power supply and the current of the motor control circuit in real time, and can determine the current maximum feedback current of the power supply according to the current first electrical parameter of the power supply, when a brake signal is acquired, a control signal for adjusting the current voltage of the motor is output to the driving unit according to the current maximum feedback current of the power supply and the current of the motor control circuit, so that the driving unit adjusts the current voltage of the motor according to the control signal to adjust the rotating speed of the motor, thereby realizing brake control of the electric tool and avoiding overvoltage of the circuit.
Optionally, the control signal is a PWM duty cycle or PWM modulation frequency.
The controller adjusts and outputs a control signal for adjusting the current voltage of the motor according to the current maximum feedback current of the power supply and the current of the motor control circuit, and the method can comprise the following steps: when the current maximum feedback current of the power supply is larger than the current of the motor control circuit, the original PWM control signal is not changed, namely, the braking command is continuously executed according to the original braking program; when the current maximum feedback current of the power supply is smaller than the current of the motor control circuit, the PWM duty ratio decreasing amplitude is increased, or the PWM frequency decreasing amplitude is increased, so that the PWM decreasing speed is increased, the motor bus voltage is prevented from rising or rising too fast, and finally the current of the motor control circuit is enabled to be zero, so that the braking function is realized.
The absorption capacity of the power source (for example, a battery pack) refers to the maximum feedback current that the battery pack can currently withstand. In general, in a low-temperature environment, the capability of the battery pack for bearing the maximum feedback current is weakened, if braking is performed according to the braking parameter at normal temperature, the braking current at the moment is not matched with the maximum feedback current which can be borne by the battery pack in the current state, so that the bus voltage is raised, further, the voltage loaded on the driving circuit is raised, and finally, the MOS tube in the driving circuit can be possibly damaged. For example, taking a first electrical parameter of a power supply as temperature information as an example, the implementation process of the electric tool is as follows: in the working process of the electric tool, the first detection unit 40 detects and obtains the current temperature information of the power supply 20 in real time and sends the current of the motor control circuit to the controller 60, the second detection unit 50 detects and obtains the current of the motor control circuit in real time and sends the current of the motor control circuit to the controller 60, the controller 60 can determine the current maximum feedback current of the power supply according to the received current temperature information of the power supply and the maximum feedback current comparison table of the power supply, when the controller 60 receives a brake signal of the electric tool, the control unit 30 adjusts and outputs a control signal for adjusting the current voltage of the motor according to the current maximum feedback current of the power supply 20 and the current of the motor control circuit, and the driving unit 30 adjusts the current voltage of the motor 10 according to the control signal so as to adjust the rotating speed of the motor, thereby realizing brake control of the electric tool and avoiding overvoltage, uncontrollable current, brake failure and the like of the circuit. Therefore, on one hand, the low-temperature braking performance can be improved, on the other hand, the braking hand feeling can be dynamically adjusted according to the battery pack capacity, and the MOS reliability is improved.
Fig. 2 is a flowchart of a control method of an electric tool according to an embodiment of the present invention, where the embodiment is applicable to a process of implementing the control method of the electric tool, and the method may be performed by the electric tool according to the embodiment of the present invention, and the electric tool includes: a motor; the power supply is electrically connected with the motor and is used for providing power supply voltage for the motor; the driving unit is electrically connected with the motor and used for driving and controlling the motor; the first detection unit is electrically connected with the power supply and is used for detecting and obtaining the current first electric parameter of the power supply; the second detection unit is electrically connected with the motor and is used for detecting and obtaining the current second electric parameter of the motor control circuit; the controller is electrically connected with at least the motor, the first detection unit and the second detection unit; referring to fig. 2, the control method of the electric tool specifically includes the following steps:
step 110, acquiring the current first electric parameter of the power supply and the current second electric parameter of the motor control circuit;
specifically, the electric tool at least comprises a motor, a power supply, a controller, a first detection unit and a second detection unit. The first detection unit is electrically connected with the power supply and the controller respectively and is used for detecting and obtaining the current first electric parameter of the power supply in real time and sending the current first electric parameter to the controller. The second detection unit is respectively and electrically connected with the motor and the controller and is used for detecting and obtaining the current second electric parameter of the motor control circuit in real time and sending the current second electric parameter to the controller.
Step 120, determining a current third electrical parameter of the power supply according to the current first electrical parameter of the power supply;
the first electrical parameter of the power supply may be one or more of temperature information, internal resistance information and parallel number of the power supply. The third electrical parameter of the power supply is the absorption capacity of the power supply, and the absorption capacity of the power supply can be determined according to one or more of the temperature information, the internal resistance information and the parallel number of the power supply.
And 130, when the brake signal is acquired, adjusting and outputting a control signal for adjusting the current voltage of the motor to the driving unit according to the current third electric parameter of the power supply and the current second electric parameter of the motor control circuit.
Specifically, the controller receives a current first electrical parameter of the power supply and a current second electrical parameter of the motor control circuit; determining a current third electrical parameter of the power supply according to the current first electrical parameter of the power supply; when a brake signal is obtained, a control signal for adjusting the current voltage of the motor is regulated and output to the driving unit according to the current third electric parameter of the power supply and the current second electric parameter of the motor control circuit, and the driving unit adjusts the current voltage of the motor according to the control signal so as to adjust the rotating speed of the motor, so that brake control of the electric tool is realized, and overvoltage of the circuit is avoided.
According to the technical scheme, the electric tool control method is provided. The electric tool control method is performed by an electric tool including: a motor; the power supply is electrically connected with the motor and is used for providing power supply voltage for the motor; the driving unit is electrically connected with the motor and used for driving and controlling the motor; the first detection unit is electrically connected with the power supply and is used for detecting and obtaining the current first electric parameter of the power supply; the second detection unit is electrically connected with the motor and is used for detecting and obtaining the current second electric parameter of the motor control circuit; the controller is electrically connected with at least the motor, the first detection unit and the second detection unit; the control method comprises the following steps: acquiring a current first electrical parameter of a power supply and a current second electrical parameter of a motor control circuit; determining a current third electrical parameter of the power supply according to the current first electrical parameter of the power supply; when the brake signal is acquired, a control signal for adjusting the current voltage of the motor is adjusted and output to the driving unit according to the current third electric parameter of the power supply and the current second electric parameter of the motor control circuit. The method can solve the problems of brake failure caused by uncontrollable brake current, excessive motor pressure and the like of the existing electric tool due to the change of the temperature, the internal resistance and the like of the electric tool or a battery pack, and can obtain the current first electric parameter of a power supply and the current second electric parameter of a motor control circuit in the working process of the electric tool; determining a current third electrical parameter of the power supply according to the current first electrical parameter of the power supply; and when a brake signal is obtained, a control signal for adjusting the current voltage of the motor is regulated and output to the driving unit according to the current third electric parameter of the power supply and the current second electric parameter of the motor control circuit, so that the rotating speed of the motor is regulated to adjust the brake control of the electric tool, and the conditions of uncontrollable circuit current, overpressure, brake failure and the like are avoided.
Optionally, the first electrical parameter includes at least temperature information, internal resistance information, and a parallel number of the power supply.
Optionally, the current third electrical parameter of the power supply comprises at least a current maximum feedback current of the power supply.
Optionally, determining the current absorption capacity of the power supply according to the current first electrical parameter of the power supply includes:
and determining a current third electrical parameter of the power supply according to the first electrical parameter of the power supply and the maximum feedback current comparison table of the power supply.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.

Claims (10)

1. A power tool, comprising:
a motor;
the power supply is electrically connected with the motor and is used for providing power supply voltage for the motor;
the driving unit is electrically connected with the motor and used for driving and controlling the motor;
the first detection unit is electrically connected with the power supply and is used for detecting and obtaining the current first electric parameter of the power supply;
the second detection unit is electrically connected with the motor and is used for detecting and obtaining the current second electric parameter of the motor control circuit;
the controller is electrically connected with at least the motor, the first detection unit and the second detection unit;
the controller is configured to:
acquiring a current first electrical parameter of the power supply and a current second electrical parameter of the motor control circuit;
determining a current third electrical parameter of the power supply according to the current first electrical parameter of the power supply;
when a brake signal is acquired, a control signal for adjusting the current voltage of the motor is regulated and output to the driving unit according to the current third electric parameter of the power supply and the current second electric parameter of the motor control circuit.
2. The power tool of claim 1, wherein the first electrical parameter includes at least temperature information, internal resistance information, and a number of parallels of the power source.
3. The power tool of claim 1, wherein the current third electrical parameter of the power source comprises at least a current maximum feedback current of the power source.
4. The power tool of claim 3, wherein said determining a current third electrical parameter of the power source from a current first electrical parameter of the power source comprises:
and determining a current third electrical parameter of the power supply according to the first electrical parameter of the power supply and a maximum feedback current comparison table of the power supply.
5. The power tool of claim 1, wherein the second electrical parameter comprises at least: the motor controls the current of the line.
6. The power tool of claim 1, wherein the control signal is a PWM duty cycle or a PWM modulation frequency.
7. A control method of an electric tool, characterized by being executed by an electric tool, comprising: a motor; the power supply is electrically connected with the motor and is used for providing power supply voltage for the motor; the driving unit is electrically connected with the motor and used for driving and controlling the motor; the first detection unit is electrically connected with the power supply and is used for detecting and obtaining the current first electric parameter of the power supply; the second detection unit is electrically connected with the motor and is used for detecting and obtaining the current second electric parameter of the motor control circuit; the controller is electrically connected with at least the motor, the first detection unit and the second detection unit;
the control method comprises the following steps:
acquiring a current first electrical parameter of the power supply and a current second electrical parameter of the motor control circuit;
determining a current third electrical parameter of the power supply according to the current first electrical parameter of the power supply;
when a brake signal is acquired, a control signal for adjusting the current voltage of the motor is regulated and output to the driving unit according to the current third electric parameter of the power supply and the current second electric parameter of the motor control circuit.
8. The method according to claim 7, wherein the first electrical parameter includes at least temperature information, internal resistance information, and a parallel number of the power supply.
9. The method of claim 7, wherein the current third electrical parameter of the power source comprises at least a current maximum feedback current of the power source.
10. The method of claim 9, wherein determining the current absorption capacity of the power source based on the current first electrical parameter of the power source comprises:
and determining a current third electrical parameter of the power supply according to the first electrical parameter of the power supply and a maximum feedback current comparison table of the power supply.
CN202210118391.1A 2022-02-08 2022-02-08 Electric tool and control method thereof Pending CN116614044A (en)

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CN202210118391.1A CN116614044A (en) 2022-02-08 2022-02-08 Electric tool and control method thereof

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