CN-122026672-A - Electric tool

CN122026672ACN 122026672 ACN122026672 ACN 122026672ACN-122026672-A

Abstract

The application discloses an electric tool and a control method thereof. The electric tool comprises a shell, a functional part, a motor, a power supply device and a controller, wherein the motor is configured to drive the functional part to work, the power supply device is configured to supply power to at least the motor, the controller is electrically connected with the motor and the power supply device and is configured to control the motor to operate, and the controller is specifically configured to determine the real-time temperature of the motor at least based on the structural parameters, the thermal parameters and the real-time electrical parameters of the motor in the operation process of the motor and dynamically adjust the current control strategy of the motor based on the real-time temperature and/or the change trend of the real-time temperature.

Inventors

CHEN SHANGSI
CHEN DIECONG
ZHANG LUNLUN

Assignees

南京泉峰科技有限公司

Dates

Publication Date: 20260512
Application Date: 20250928
Priority Date: 20241108

Claims (14)

1. A power tool, comprising: A housing and a functional member; A motor configured to drive the function member to operate; a power supply configured to supply power to at least the motor; A controller electrically connected to the motor and configured to control operation of the motor; the controller is specifically configured to determine a real-time temperature of the motor based on at least structural parameters, thermal parameters and real-time electrical parameters of the motor during operation of the motor, and dynamically adjust a current control strategy of the motor based on the real-time temperature and/or a trend of change in the real-time temperature.
2. The power tool of claim 1, wherein the real-time electrical parameter of the motor comprises one or more of a real-time current, a real-time voltage, a real-time rotational speed, and a real-time power of the motor.
3. The power tool of claim 1, wherein the thermal parameters of the motor comprise thermal coefficients and/or thermal coefficients of one or more components within the motor, the thermal coefficients and/or thermal coefficients comprising a material type and/or mass of one or more of a permanent magnet, a core, a winding within the motor, and a heat dissipation pattern of the motor.
4. The power tool of claim 1, wherein the structural parameters of the motor include one or more of a stator profile and size, a rotor profile and size, a slot number, and a pole pair number of the motor.
5. The power tool of claim 1, wherein the controller is configured to determine a real-time temperature rise of the motor during operation based on the structural parameter, the thermal parameter, and the real-time electrical parameter, and dynamically adjust a current control strategy of the motor based on the real-time temperature rise and/or a trend of the real-time temperature rise.
6. The power tool of claim 1, wherein the controller is configured to determine a real-time temperature of the motor during operation based on the structural parameter, the thermal parameter, the real-time electrical parameter, and a reference point temperature, and dynamically adjust a current control strategy of the motor based on the real-time temperature and a trend of change in the real-time temperature.
7. The power tool of claim 1, wherein the controller is configured to limit one or more of current, rotational speed, torque, power of the motor if the real-time temperature exceeds a first threshold and the real-time temperature is in a growing trend.
8. The power tool of claim 7, wherein the controller is configured to periodically calculate a real-time temperature of the motor and determine a state of a current temperature flag based on a numerical relationship between the real-time temperature calculated in the present period and a first threshold, a second threshold, and a real-time temperature calculated in a previous period, the first threshold being less than the second threshold, the temperature flag having at least three states of "0", "1", "2".
9. The power tool of claim 8, wherein the controller is configured to maintain, or increment in steps, or decrement in steps, a control target value including a current target value and/or a rotational speed target value based on the state of the current temperature flag periodically.
10. The power tool of claim 8, wherein the controller is configured to set the temperature flag to "0" if the real-time temperature calculated in the present cycle is below the first threshold, and/or to set the temperature flag to "2" if the real-time temperature calculated in the present cycle is above the second threshold or above the first threshold and in an increasing trend, and/or to set the temperature flag to "1" if the real-time temperature calculated in the present cycle is above the first threshold and below the second threshold or above the first threshold and in a decreasing trend.
11. The electric tool according to claim 10, wherein the controller is configured to set the control target value to be stepwise increased with a preset value or a user set value as an upper limit in the case where the current temperature flag is "0", and/or to set the control target value to be stepwise decreased in the case where the current temperature flag is "2", and/or to set the control target value to be stepwise decreased in the case where the current temperature flag is "1", and the stepwise amount of the single decrease is smaller than the stepwise amount of the single decrease when the temperature flag is "2".
12. A power tool, comprising: A housing and a functional member; a motor including a stator assembly and a rotor assembly configured to drive operation of the functional member; a power supply configured to supply power to at least the motor; A controller electrically connected to the motor and configured to control operation of the motor; wherein, the electric tool further includes: A temperature sensor disposed at a first location within the power tool and configured to detect a first real-time temperature of the first location; The controller is further electrically coupled to the temperature sensor and is specifically configured to obtain the first real-time temperature during operation of the motor, determine a second real-time temperature at a second location within the motor based at least on the first real-time temperature and a real-time electrical parameter of the motor, the second location being different from the first location.
13. The power tool of claim 12, wherein the second position is a non-stationary position during operation of the motor, the second position being located on a rotor assembly of the motor, and the first position is a stationary position during operation of the motor, the first position being located on a stator assembly of the motor.
14. The power tool of claim 12, wherein the first real-time temperature is a cabinet temperature or an ambient temperature.

Description

Electric tool Technical Field The application relates to the technical field of electric tools, for example to an electric tool. Background The electric tools widely applied to industries such as gardens, buildings and the like and household scenes are mostly driven by motors at present to output functional parts on shafts so as to execute operations such as cutting, fastening, polishing and the like, and some wheel-type tools comprise a walking motor for driving walking parts besides the working motors for driving the functional parts. The output performance of the motor is significantly affected by temperature, and high power output of the motor is required for many kinds of electric tools and for many working conditions of the electric tools, and the temperature rise of the motor caused by the above conditions may cause problems of failure and damage of the motor control, so that the temperature of the motor needs to be detected to avoid unnecessary over-temperature risk. This section provides background information related to the application, which is not necessarily prior art. Disclosure of Invention It is an object of the present application to solve or at least mitigate some or all of the above problems. To this end, the present application provides a power tool. The application adopts the following technical scheme: An electric tool comprises a shell, a functional part, a motor, a power supply device, a controller and a controller, wherein the motor is used for driving the functional part to work, the power supply device is used for supplying power to at least the motor, the controller is electrically connected with the motor and used for controlling the operation of the motor, and the controller is specifically used for determining the real-time temperature of the motor at least based on the structural parameters, the thermal parameters and the real-time electrical parameters of the motor in the operation process of the motor and dynamically adjusting the current control strategy of the motor based on the real-time temperature and/or the change trend of the real-time temperature. In some embodiments, the real-time electrical parameters of the motor include one or more of real-time current, real-time voltage, real-time rotational speed, real-time power of the motor. In some embodiments, the thermal parameters of the motor include thermal resistivity and/or thermal capacitance of one or more components within the motor, including the type and/or mass of material and/or thermal conductivity of one or more of the permanent magnets, cores, windings within the motor, and the manner in which the motor dissipates heat. In some embodiments, the structural parameters of the motor include one or more of stator profile and size, rotor profile and size, slot count, pole pair number of the motor. In some embodiments, the structural parameters of the motor include a specific component structure of the motor, and the specific component structure of the motor includes a thermal resistance node, a heat capacity node, a heat source node and a connection relationship between the three nodes, which are equivalent to the motor. In some embodiments, the controller is configured to determine a real-time temperature rise of the motor during operation based on the structural parameters, the thermal parameters, and the real-time electrical parameters, and dynamically adjust a current control strategy of the motor based on the real-time temperature rise and/or a trend of change in the real-time temperature rise. In some embodiments, the controller is configured to determine a real-time temperature of the motor during operation based on the structural parameter, the thermal parameter, the real-time electrical parameter, and the reference point temperature, and dynamically adjust a current control strategy of the motor based on the real-time temperature and a trend of change in the real-time temperature. In some embodiments, the controller is configured to limit one or more of current, speed, torque, power of the motor if the real-time temperature exceeds the first threshold and the real-time temperature is in a growing trend. In some embodiments, the controller is configured to periodically calculate a real-time temperature of the motor and determine a state of a current temperature flag based on a numerical relationship between the real-time temperature calculated in the present period and the real-time temperature calculated in a first threshold, a second threshold, and the real-time temperature calculated in a previous period, the second threshold being greater than the first threshold, the temperature flag having at least three states of "0", "1", and "2". In some embodiments, the controller is configured to maintain, or increment in steps, or decrement in steps, control target values including a current target value and/or a speed target value for motor operation control based on the state of the current temperature flag