CN215817842U

CN215817842U - Electric tool

Info

Publication number: CN215817842U
Application number: CN202121914232.XU
Authority: CN
Inventors: 黄一凡; 王金城; 朱锋霖; 周富爱; 孙荣喜
Original assignee: Zhejiang Crown Electric Tools Manufacture Co ltd
Current assignee: Zhejiang Crown Electric Tools Manufacture Co ltd
Priority date: 2021-08-16
Filing date: 2021-08-16
Publication date: 2022-02-11
Anticipated expiration: 2031-08-16

Abstract

The application provides an electric tool, through with the controller setting outside the instrument casing, can greatly reduced whole electric tool's volume and weight. Furthermore, the controller generates heat, so that the heating problem of the electric tool can be effectively improved by externally arranging the controller. Furthermore, the controller is external, so that the structure of the controller is not limited by the internal structure of the electric tool, and the controller can comprise at least one data acquisition module and at least one main control module, so that the electric tool and the controller can be not only used in one-to-one connection, but also connected with a plurality of electric tools through one controller. Still further, because the controller still includes the data acquisition module, the data acquisition module is used for gathering the parameter of motor in the use, can gather the parameter of motor during operation like this in real time, make things convenient for the later stage to carry out analysis and maintenance to electric tool.

Description

Electric tool

Technical Field

The invention relates to the technical field of electric tools, in particular to an electric tool.

Background

Most power tools are equipped with an electronic integrated device, also known as a controller, that supplies current and control signals to the motor, and the controller is usually mounted in a housing by a built-in mounting method. According to the installation method, if the controller is in fault maintenance, the shell needs to be detached, the maintenance difficulty is increased, the appearance of the controller is limited by the appearance of the electric tool, and only one controller can be matched with one tool shell. The universality is poor, and the design, manufacturing and after-sale costs are increased. Moreover, the structure and the volume of the built-in controller are limited by the internal space of the tool shell, so that other functional modules cannot be added to the controller, and the function is single. Meanwhile, the controller is easy to generate heat, the heat productivity of the electric tool is easy to increase due to the fact that the controller is arranged in the tool shell, and higher challenges are brought to heat dissipation of the electric tool.

Disclosure of Invention

The invention aims to provide an electric tool to solve the technical problem that a controller of the conventional electric tool is single in function.

To achieve the above object, the present application provides an electric power tool including a tool housing, a motor, and a controller; the motor is arranged in the tool shell; the controller is arranged outside the tool shell and is electrically connected with the motor;

the controller comprises at least one data acquisition module and at least one main control module; one data acquisition module is connected with one main control module; the main control module comprises a driving circuit and a control circuit; the control circuit is connected with the driving circuit; the driving circuit is connected with the motor; the driving circuit drives the motor to work; the data acquisition module is used for acquiring parameters of the motor in the using process.

Optionally, in the electric tool, the motor is a switched reluctance motor.

Optionally, in the electric tool, the motor further includes a motor shaft, a magnetic ring is disposed at one end of the motor shaft close to the controller, and a hall sensor matched with the magnetic ring is disposed on an inner wall of the tool housing close to the controller.

Optionally, in the electric tool, the data acquisition module further includes a storage module and a wireless transmission module; the storage module is connected with the data acquisition module to store the parameters of the motor acquired by the data acquisition module in the using process; the wireless transmission module is simultaneously connected with the storage module and the data acquisition module.

Optionally, in the power tool, the storage module includes at least three storage areas; each storage area correspondingly stores one type of the working condition of the electric tool.

Optionally, in the electric tool, the wireless transmission module is a bluetooth module, a WiFi module, or an NFC module.

Optionally, in the electric tool, the electric tool is a direct grinding machine.

Compared with the prior art, the application provides an electric tool, through setting up the controller outside the instrument casing, such electric tool compare in the built-in electric tool greatly reduced whole electric tool's of controller volume and weight to make operator light and comfortable more in the use. Furthermore, because the controller generates heat, the controller of the existing electric tool is built in, and the air entering the air inlet drives a part of heat to flow through the motor after passing through the controller, so that the heat dissipation of the motor is also unfavorable, and the heating problem of the electric tool can be effectively improved by externally arranging the controller. Therefore, the external control structure can better ventilate and radiate the motor, so that the electric tool can achieve better use performance. Furthermore, the controller is externally arranged, so that the structure of the controller is not limited by the internal structure of the electric tool, the controller can comprise at least one data acquisition module and at least one main control module, the electric tool and the controller are not only connected and used in a one-to-one mode, when a fault occurs, only one of the electric tool and the controller is required to be maintained, the other electric tool and the controller are not influenced to be matched and used, and the convenience in the aspects of after-sale maintenance and maintainability is improved. Still further, because the controller still includes the data acquisition module, the data acquisition module is used for gathering the parameter of motor in the use, can gather the parameter of motor during operation like this in real time, make things convenient for the later stage to carry out analysis and maintenance to electric tool.

Drawings

Fig. 1 is a schematic structural diagram of an electric tool provided in an embodiment of the present application;

FIG. 2 is a schematic structural diagram of another power tool provided in the embodiments of the present application;

FIG. 3 is a schematic structural diagram of another power tool provided in an embodiment of the present application;

FIG. 4 is a schematic diagram of a control system of a power tool provided in an embodiment of the present application;

FIG. 5 is a schematic diagram of a controller provided by an embodiment of the present application;

fig. 6 is a schematic diagram of another controller provided in an embodiment of the present application.

Wherein the reference numerals of figures 1 to 3 are as follows:

10-a tool housing; 11-an air inlet; 12-an air outlet; 20-a motor; 21-a motor shaft; 22-a rotor; 23-a stator; 30-a controller; 41-a magnetic ring; 42-Hall sensor; 50-terminal equipment.

Detailed Description

To make the objects, advantages and features of the present invention more clear, the following detailed description of the electric tool proposed by the present invention is made with reference to the accompanying drawings 1 to 6. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.

As used in this specification, the singular forms "a", "an" and "the" include plural referents, and the plural forms "a plurality" includes more than two referents unless the content clearly dictates otherwise. As used in this specification, the term "or" is generally employed in its sense including "and/or" unless the content clearly dictates otherwise, and the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning a fixed connection, a removable connection, an integral connection, an electrical connection, and a communication connection. Either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

Referring to fig. 1, a schematic structural diagram of an electric tool provided in the embodiment of the present application is shown. The present application provides an electric power tool including a tool housing 10, a motor 20, and a controller 30; the motor 20 is disposed within the tool housing 10; the controller 30 is disposed outside the tool housing 10, and the controller 30 is electrically connected to the motor 20. Wherein the controller 30 comprises at least one data acquisition module and at least one master control module; one data acquisition module is connected with one main control module; the main control module comprises a driving circuit and a control circuit; the control circuit is connected with the driving circuit; the driving circuit is connected with the motor 20; the driving circuit drives the motor 20 to work; the data acquisition module is used for acquiring parameters of the motor 20 in the using process.

By disposing the controller 30 outside the tool housing 10, the power tool can greatly reduce the volume and weight of the entire power tool compared to the power tool with the built-in controller 30, so that the operator can feel more light and comfortable during use. Further, because the controller 30 generates heat, the controller 30 of the conventional electric tool is built in, and the air entering the air inlet 11 passes through the controller 30 and then carries a part of heat to flow through the motor 20, which is also disadvantageous to heat dissipation of the motor 20, and the problem of heat generation of the electric tool can be effectively solved by externally arranging the controller 30. Therefore, the external control structure can better ventilate and radiate the motor 20, so that the electric tool achieves better use performance. Furthermore, since the controller 30 is external, the structure of the controller 30 is not limited by the internal structure of the power tool, so that the controller 30 may include at least one data acquisition module and at least one main control module, so that the power tool and the controller 30 are not only used in one-to-one connection, and when a fault occurs, only one of the power tool and the controller is maintained, and the other power tool are not affected to be matched for use, so that the convenience in terms of after-sales maintenance and maintainability is also improved. Still further, because the controller 30 further comprises a data acquisition module, the data acquisition module is used for acquiring parameters of the motor 20 in the using process, so that the parameters of the motor 20 during working can be acquired in real time, and the analysis and maintenance of the electric tool at the later stage are facilitated.

As shown in fig. 2, specifically, the controller 30 may further include a plurality of data acquisition modules and a plurality of main control modules; one of the data acquisition modules is connected with one of the main control modules. Therefore, one controller 30 can be connected with a plurality of electric tools, so that one electric tool is not needed to be matched with one controller 30, and the controller 30 has high cost and heavy weight, so that the cost can be reduced, the weight of each electric tool can be reduced, and the electric tools have lower cost and are lighter.

The motor 20 is a switched reluctance motor, and the switched reluctance motor used in the switched reluctance motor speed regulation system is a component for realizing electromechanical energy conversion in a switched reluctance motor control system, and is also a main mark of a switched reluctance motor driving system different from other motor driving systems. The switched reluctance motor is a double salient pole variable reluctance motor, and salient poles of a stator 23 and a rotor 22 are formed by laminating common silicon steel sheets. The rotor 22 has no winding or permanent magnet, the stator 23 is wound with concentrated windings, two radially opposite windings are connected to form a phase, the switched reluctance motor can be designed into various structures with different phase numbers, and the pole numbers of the stator 23 and the rotor 22 are matched in various ways. The structure is simpler than that of a variable-frequency induction motor. The outstanding advantages are that there are no windings of any kind on the rotor 22, the control of dust and the technological requirements on the rotor 22 are very simple and the rotor 22 is extremely mechanically strong. In the stator 23, it has only a few concentrated windings, so that it is simple to manufacture and simple in insulation structure. And (3) control system aspect: the torque of the switched reluctance motor is irrelevant to the current polarity, only unidirectional current excitation is needed, and the switched reluctance motor driving system is simple in circuit, high in reliability and lower in cost than an alternating current speed regulation system.

As shown in fig. 3, in one embodiment, the data acquisition module further includes a storage module and a wireless transmission module; the storage module is connected with the data acquisition module to store the parameters of the motor 20 acquired by the data acquisition module in the using process; the wireless transmission module is simultaneously connected with the storage module and the data acquisition module. If the wireless module is connected with the terminal device 50, the parameters of the motor 20 acquired by the data acquisition module in the using process are directly sent to the terminal device 50 through the wireless communication module. If the wireless module cannot be connected with the terminal device 50 in time, the parameters of the motor 20 acquired by the data acquisition module in the using process are directly sent to the storage module, and after the wireless communication module is connected with the terminal device 50, the parameters are sent to the terminal device 50 from the storage module. The parameters are, but not limited to, current, voltage, power, and power factor during the operation of the motor 20.

Preferably, the storage module comprises at least three storage areas, and each storage area stores one of the working conditions of the electric tool correspondingly. Wherein use electric tool service condition be three kinds for the example, three kinds of operating modes are respectively: polishing and cutting metal; polishing and cutting the stone; and (5) polishing and grinding the wood. Specifically, the controller 30 is provided with a working condition selection key, and before the electric tool starts to work, the working condition selection key is pressed to select a corresponding working condition, that is, the data acquisition module is used for acquiring parameters corresponding to the working condition, so that the mobile terminal can accurately analyze the performance of the electric tool under the use conditions of different working conditions.

Specifically, the controller 30 further includes a controller 30 housing, and the controller 30 housing is provided with a working condition selection key, so that the electric tool can be operated before the electric tool starts to work

Specifically, taking the electric tool as a direct grinding machine as an example, the electric tool comprises a tool housing 10, a switched reluctance motor, a controller 30 and a power line. The switched reluctance motor is disposed within the tool housing 10; the controller 30 is disposed outside the tool housing 10, and the controller 30 is electrically connected to the motor 20. Wherein, an air inlet 11 and an air outlet 12 are arranged on the tool housing 10. The switched reluctance motor is mounted inside the tool housing 10 and is composed of a stator 23 and a rotor 22, the rotor 22 is inserted into the stator 23, and the rotor 22 can flexibly rotate relative to the stator 23 to provide driving force.

The motor 20 further includes a motor shaft 21, a magnetic ring 41 is disposed at an end of the motor shaft 21 close to the controller 30, and a hall sensor matched with the magnetic ring 41 is disposed on an inner wall of the tool housing 10 close to the controller 30.

Referring to fig. 4-6 in conjunction with fig. 1-3, in another aspect, the present application further provides a control system for an electric power tool, including: motor 20, drive circuit, control circuit and data acquisition module. The driving circuit is connected with the motor 20 to drive the motor 20 to work. The control circuit is connected with the driving circuit and used for controlling the motor 20 to work or stop. The data acquisition module is connected with the control circuit and used for acquiring parameters of the motor 20 in the using process; the data acquisition module is also in communication connection with a terminal device 50 to send the acquired parameters to the terminal device 50.

Of course, the control system of the electric tool further comprises an input power supply, and the input power supply is mainly taken as an AC direct input in the application, but the input power supply is not limited to the AC direct input, and the input power supply can also be a DC input power supply, an AC and DC universal power supply, and the like. When the input selects AC, the input power supply is a rectifying circuit which rectifies and converts AC voltage into DC voltage. When the input selects DC, the input power supply is DC power supply equipment such as a battery, a regulated power supply and the like. When the input selects AC and DC, the power supply mode can be switched arbitrarily. When the DC mode is selected for power supply, the AC voltage is not required to be accessed; an AC voltage input is required when the input is either AC mode or charging mode.

The control system of the electric tool further comprises a temperature detection module, wherein the temperature detection module is used for detecting and feeding back the internal temperature of the rectifier bridge, the switch tube and the motor 20, so that the controller 30 and the motor 20 are protected from being damaged due to over-temperature, an NTC thermistor is adopted for feeding back signals to the control circuit, and then the control circuit controls the operation mode of the motor 20, such as power-down operation, direct stop operation and the like; the temperature protection values of the motor 20 and the controller 30 are set in the control algorithm program, when the temperature detection circuit detects that the temperature is greater than the protection value, the main control circuit generates a signal to control the motor 20 to perform power-down operation or directly give an over-temperature alarm, the motor 20 stops operating, and when the temperature is reduced, the operation is resumed.

The control system of the electric tool also comprises a position detection module, and the position detection module is respectively connected with the driving circuit and the control circuit; the position detection module detects the position information of the motor 20 through the driving circuit and feeds back the position information of the motor 20 to the control circuit. Specifically, the magnetic ring 41 disposed on the motor shaft 21 is matched with a hall sensor disposed on the inner wall of the tool housing 10 close to the controller 30, the hall sensor senses a position signal of the magnetic ring 41 and sends the position signal of the magnetic ring 41 to the position detection module through a control circuit, and the position detection module obtains a position signal of the rotor 22 by detecting and analyzing the position signal, i.e., obtains position information of the motor 20.

The data acquisition module also comprises a storage module and a wireless transmission module; the storage module is connected with the data acquisition module to store the parameters of the motor 20 acquired by the data acquisition module in the using process; the wireless transmission module is connected with the storage module, the data acquisition module and the terminal device 50, and sends the parameters in the storage module or the data acquisition module to the terminal device 50.

The wireless transmission module is a Bluetooth module, a WiFi module or an NFC module.

In one embodiment, the storage module comprises at least three storage regions; each storage area correspondingly stores one type of the working condition of the electric tool. Wherein the control system is configured to: before the motor 20 is started, a use condition of the electric tool is selected, after the motor 20 is started, the data acquisition module acquires parameters of the motor 20 in the use process, and the wireless Bluetooth module sends the use condition of the electric tool and the parameters of the motor 20 in the use process to the terminal device 50 as a group of data; or, the data acquisition module sends the acquired parameters of the motor 20 in the use process to the storage area corresponding to the use condition.

The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.

Claims

1. An electric tool comprising a tool housing, a motor and a controller; the motor is arranged in the tool shell; the controller is arranged outside the tool shell and is electrically connected with the motor;

2. The power tool of claim 1, wherein the motor is a switched reluctance motor.

3. The power tool of claim 1, wherein the motor further comprises a motor shaft, a magnetic ring is disposed on an end of the motor shaft adjacent to the controller, and a hall sensor is disposed on an inner wall of the tool housing adjacent to the controller and engaged with the magnetic ring.

4. The power tool of claim 1, wherein the data acquisition module further comprises a memory module and a wireless transmission module; the storage module is connected with the data acquisition module to store the parameters of the motor acquired by the data acquisition module in the using process; the wireless transmission module is simultaneously connected with the storage module and the data acquisition module.

5. The power tool of claim 4, wherein the storage module includes at least three storage areas; each storage area correspondingly stores one type of the working condition of the electric tool.

6. The power tool of claim 4, wherein the wireless transmission module is a Bluetooth module or a WiFi module or an NFC module.

7. The power tool of claim 1, wherein the power tool is a straight grinder.