CN215120471U

CN215120471U - Motor device for driving electric tool and electric tool

Info

Publication number: CN215120471U
Application number: CN202121596661.7U
Authority: CN
Inventors: 刘双凤
Original assignee: Suzhou Meili Tool Technology Co ltd
Current assignee: Suzhou Meili Tool Technology Co ltd
Priority date: 2021-07-14
Filing date: 2021-07-14
Publication date: 2021-12-10
Anticipated expiration: 2031-07-14

Abstract

The application discloses a motor device for driving an electric tool and the electric tool, wherein the motor device comprises a motor and a stator, wherein the stator is provided with a plurality of groups of stator windings; the power supply assembly supplies power to the motor; the control assembly is connected in series between the motor and the power supply assembly, a control unit is arranged on the control assembly and comprises a plurality of stator power supply control elements, the plurality of stator power supply control elements are electrically connected with the plurality of groups of stator windings in a one-to-one correspondence manner, and any one stator power supply control element controls the corresponding stator winding to generate a magnetic field; the problems that the current is overlarge in current, the heat productivity is increased and the power consumption is increased in the using process of a high-power motor due to the fact that the power input is achieved through the existing three-phase power supply can be solved.

Description

Motor device for driving electric tool and electric tool

Technical Field

The application relates to the technical field of electric tools, in particular to a motor device for driving an electric tool and the electric tool.

Background

The existing electric tools generally use brushless intelligent motors, and realize the input of power supply through a three-phase power supply, so as to drive the motors to work. However, in such a driving method, when the motor power is increased and a larger current is required, the current of each phase line is large, and the heat generation amount is also large.

Accordingly, there is a need for improvements in the art that overcome the deficiencies in the prior art.

SUMMERY OF THE UTILITY MODEL

The application provides a motor device and electric tool of drive electric tool can solve current use three phase current and realize power input and lead to high-power motor too big, calorific capacity increase at the in-process electric current that uses, increase the problem of consumption. The application provides the following technical scheme:

in a first aspect, there is provided a motor apparatus for driving a power tool, comprising:

the motor is provided with a stator, and a plurality of groups of stator windings are wound on the stator;

a power supply assembly for supplying power to the motor;

the control assembly is connected between the motor and the power supply assembly in series, a control unit is arranged on the control assembly and comprises a plurality of stator power supply control elements, the stator power supply control elements are electrically connected with the stator windings in a one-to-one correspondence mode, and any one of the stator power supply control elements controls the corresponding stator winding to generate a magnetic field.

Optionally, the power supply assembly is a battery pack, the battery pack has a plurality of batteries, and the plurality of batteries are connected with the plurality of stator power supply control elements in a one-to-one correspondence manner.

Optionally, the motor apparatus comprises a plurality of motor modules, each of which comprises one of the motors, one of the power supply assemblies, and one of the control units.

Optionally, at least part of the control units are driven by trigger signals at the same time to control the corresponding power supply components to supply power to the motors at the same time.

Optionally, the motor further includes a rotor, the rotor is located in the stator, a plurality of sets of rotor windings are wound on the rotor, the control assembly further includes a rotor power supply control unit, and the rotor power supply control unit is electrically connected with the rotor windings to generate a magnetic field outside the rotor.

Optionally, the rotor power control unit includes a plurality of rotor power control elements, and the plurality of rotor power control elements are electrically connected to the plurality of rotor windings in a one-to-one correspondence manner.

Optionally, a plurality of magnetic shoes are installed outside the rotor, and the plurality of magnetic shoes generate a plurality of magnetic fields outside the rotor.

Optionally, the magnetic shoe is a rare earth magnetic shoe.

Optionally, a connection port is connected to each set of stator windings, and one of the stator power control members is connected to one of the connection ports by a wire.

In a second aspect, there is provided an electric power tool including the motor apparatus of any one of the first aspects, further including:

a housing having an opening;

the working head is at least partially positioned in the shell and is connected with an output shaft of the motor;

switch module, including shift knob, with shift knob fixed set up the sliding block and with the connecting rod that the sliding block links to each other, shift knob is located the opening part, the sliding block the connecting rod is located in the shell, the recess has on the sliding block, the one end of connecting rod insert to in the recess, the other end with control assembly connects.

The beneficial effect of this application lies in: the motor device comprises a motor, a power supply assembly and a control assembly, wherein the motor is provided with a stator, a plurality of groups of stator windings are wound on the stator, the control assembly is provided with a control unit, the control unit comprises a plurality of stator power supply control elements, and the plurality of stator power supply control elements are electrically connected with the plurality of groups of stator windings in a one-to-one corresponding mode to generate a magnetic field outside the stator windings; the problems that the current is overlarge in current, the heat productivity is increased and the power consumption is increased in the using process of a high-power motor due to the fact that the power input is achieved through the existing three-phase power supply can be solved.

The foregoing description is only an overview of the technical solutions of the present application, and in order to make the technical solutions of the present application more clear and clear, and to implement the technical solutions according to the content of the description, the following detailed description is made with reference to the preferred embodiments of the present application and the accompanying drawings.

Drawings

FIG. 1 is a schematic view of an electromechanical machine provided in accordance with an embodiment of the present application;

FIG. 2 is a schematic view of an electromechanical machine provided in accordance with another embodiment of the present application;

fig. 3 is a schematic view of a power tool provided in an embodiment of the present application.

Wherein: 100-electric tool, 1-shell, 11-opening, 12-handle, 2-working head, 3-switch component, 31-switch button, 32-sliding block, 321-groove, 33-connecting rod, 34-spring, 4-motor device, 41-motor, 411-stator, 4111-stator winding, 412-rotor, 4121-rotor winding, 4122-magnetic shoe, 42-power supply component, 43-control component, 431-control unit, 4311-stator power supply control component, 432-switch driving rod.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be considered limiting of the scope of the present application. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention of the present application, the meaning of "a plurality" is two or more unless otherwise specified.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art through specific situations.

The electric power tool is a tool powered by electricity. There are many types of power tools including, but not limited to, electric drills, hammers, impact drills, jig saws, and the like.

Referring to fig. 1 to fig. 3, fig. 1 is a schematic view of a motor device according to a preferred embodiment of the present application. As shown in fig. 1, the motor device 4 includes at least a motor 41, a power supply unit 42, and a control unit 43. The power supply unit 42 serves as a power supply device of the power tool 100 and supplies power to the motor 41. In this embodiment, the power supply component 42 is a battery pack.

The motor 41, which is a power output device of the electric power tool 100, has a stator 411 and a rotor 412 located inside the stator 411, and the rotor 412 is rotated by interaction of a magnetic field generated by the stator 411 and a magnetic field generated by the rotor 412. A plurality of stator windings 4111 are wound around the stator 411, and when the stator windings 4111 are energized, a magnetic field is generated outside the stator 411. Alternatively, the number of stator windings 4111 wound on one stator 411 is not limited, and may be one or more groups. However, when only one set of stator winding 4111 is wound on the stator 411, the motor 41 may be unstable in rotation, and when a plurality of sets of stator windings 4111 are wound on the stator 411, the volume of the motor 41 may be too large, so that in order to stabilize the rotation of the motor 41 and prevent the volume of the motor 41 from being too large, in this embodiment, three sets of stator windings 4111 are wound on one stator 411.

The rotor 412 may be wound with rotor windings 4121 or mounted with magnetic shoes 4122 to generate a magnetic field outside the rotor 412. When the plurality of sets of rotor windings 4121 are wound on the rotor 412, the control unit 43 controls the power supply unit 42 to supply power to the plurality of sets of rotor windings 4121, so that a plurality of magnetic fields are generated outside the rotor 412. When the plurality of magnetic tiles 4122 are mounted on the rotor 412, the plurality of magnetic tiles 4122 can generate a plurality of magnetic fields outside the rotor 412 by themselves without the power supply 42. In order to improve the magnetic properties of the magnetic shoe 4122, in the present embodiment, the magnetic shoe 4122 is a rare earth magnetic shoe.

The control unit 43 is connected in series between the motor 41 and the power supply unit 42, and has a control unit 431 for controlling the manner in which the power supply unit 42 supplies power to the motor 41. The control unit 431 includes a plurality of stator power control elements 4311, the plurality of stator power control elements 4311 are electrically connected to the plurality of sets of stator windings 4111 in a one-to-one correspondence manner, and any one of the stator power control elements 4311 controls the corresponding stator winding 4111 to generate a magnetic field. More specifically, a terminal port (not shown) is connected to each stator winding 4111, and one stator power control 4311 is connected to one terminal port via an electric wire. The stator power control pieces 4311 control the power supply pieces 42 to supply power to the corresponding stator windings 4111, so that the problems of overlarge current, increased heat productivity and increased power consumption caused by no shunt in the use process of the high-power motor 41 are solved.

To reduce the voltage and discharge requirements of the battery pack when the power supply 42 is a battery pack, in one embodiment, the battery pack has a plurality of battery packs connected in a one-to-one correspondence with the plurality of stator power controls 4311 such that one battery pack only needs to supply power to one set of rotor windings 4121.

When the rotor winding 4121 is wound on the rotor 412, the control assembly 43 further includes a rotor power control unit (not shown) thereon for electrically connecting with the rotor winding 4121 to generate a magnetic field outside the rotor 412. To also achieve the purpose of shunting, in one embodiment, the rotor power control unit includes a plurality of rotor power control components (not shown) electrically connected to the plurality of rotor windings 4121 in a one-to-one correspondence.

Of course, in general, there may be more than one motor 41 in a power tool 100. In this case, the motor apparatus 4 includes a plurality of motor modules, each of which includes a motor 41, a power supply assembly 42, and a control unit 431. At least a part of the control units 431 is driven by the trigger signal at the same time to control the corresponding power supply assembly 42 while supplying power to the motor 41 to rotate the corresponding motor 41. In one example, the trigger signal may be a shift position of a start switch of the power tool 100. Specifically, the starting switch has two gears, namely a first gear and a second gear, correspondingly, the number of the motor modules is two, when the starting switch is in the first gear, only one motor module works at the same time, and when the starting switch is in the second gear, the two motor modules work at the same time. Of course, the number of the motor modules may be more than two, and the application does not limit this. In actual production life, motors 41 with different numbers can be driven to work at the same time according to different working conditions, and the utilization rate of energy is improved.

The electric power tool 100 includes at least a housing 1, a working head 2, and a switch assembly 3 in addition to the motor device 4 described above. The working head 2 is at least partially positioned in the shell 1, is connected with an output shaft of the motor 41 and is driven by the motor 41 to work. The switch assembly 3 is located in the housing 1 and includes a switch button 31, and correspondingly, the housing 1 has an opening 11, and the switch button 31 is located at the opening 11, so that the switch button 31 can be conveniently pressed by a worker when using the electric tool 100. Further, the opening 11 is disposed at the handle 12 of the housing 1, so as to be designed to be ergonomic and to facilitate the use of the electric tool 100 by the worker.

The switch assembly 3 includes, in addition to the switch button 31, a sliding block 32 fixedly disposed on the switch button 31 and a connecting rod 33 connected to the sliding block 32, the sliding block 32 and the connecting rod 33 are disposed in the housing 1, the sliding block 32 has a groove 321, one end of the connecting rod 33 is inserted into the groove 321, and the other end is connected to the control assembly 43. Further, the control assembly 43 further includes a switch driving rod 432, and the other end of the connecting rod 33 abuts against the switch driving rod 432. When the switch button 31 is pressed, the sliding block 32 connected to the switch button 31 moves inward, and then drives one end of the connecting rod 33 to rotate, and the other end of the connecting rod 33 rotates in the opposite direction, and then pushes the switch driving rod 432 to turn on the control component 43, and the control component 43 controls the power supply component 42 to supply power to the motor 41.

When the switch knob 31 is released, the switch knob 31 needs to return to the original position to turn off the power tool 100. Therefore, to achieve this function, switch assembly 3 further includes a spring 34, one end of spring 34 is fixedly mounted on the inner wall of power tool 100, and the other end abuts against sliding block 12. When power tool 100 is activated, spring 34 is in a compressed state, and when switch button 11 is released, spring 34 has a resilient force so that switch button 11 follows slide block 12 back to the original position.

In summary, the present application provides a motor device for driving an electric tool and an electric tool, which are reasonable in design and compact in structure, wherein the motor device includes a motor, a power supply module and a control module, the motor has a stator, a plurality of groups of stator windings are wound on the stator, the control module has a control unit, the control unit includes a plurality of stator power supply control elements, and the plurality of stator power supply control elements are electrically connected with the plurality of groups of stator windings in a one-to-one correspondence manner to generate a magnetic field outside the stator windings; the problems that the current is overlarge in current, the heat productivity is increased and the power consumption is increased in the using process of a high-power motor due to the fact that the power input is achieved through the existing three-phase power supply can be solved.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A motor apparatus for driving a power tool, comprising:

a power supply assembly for supplying power to the motor;

2. The motor apparatus for driving a power tool of claim 1, wherein the power source assembly is a plurality of battery packs, and a plurality of the battery packs are connected to a plurality of the stator power control elements in a one-to-one correspondence.

3. The motor arrangement for driving a power tool of claim 1, wherein said motor arrangement includes a plurality of motor modules, each of said motor modules including one of said motors, one of said power supply assemblies, and one of said control units.

4. The motor apparatus for driving a power tool according to claim 3, wherein at least some of the control units are driven by the same timing of the trigger signal to control the corresponding power supply unit to simultaneously supply power to the motor.

5. The motor apparatus for driving a power tool of claim 1, wherein said motor further includes a rotor, said rotor being positioned within said stator, said rotor having a plurality of sets of rotor windings wound thereon, said control assembly further including a rotor power control unit electrically connected to said rotor windings for generating a magnetic field external to said rotor.

6. The motor apparatus for driving a power tool of claim 5, wherein said rotor power control unit includes a plurality of rotor power control members electrically connected to a plurality of said rotor windings in a one-to-one correspondence.

7. The motor apparatus for driving a power tool of claim 5, wherein a plurality of magnetic shoes are mounted outside said rotor, said plurality of magnetic shoes generating a plurality of magnetic fields outside said rotor.

8. The motor apparatus for driving a power tool according to claim 7, wherein the magnetic shoe is a rare earth magnetic shoe.

9. The motor apparatus for driving a power tool of claim 1 wherein a terminal port is connected to each set of said stator windings, and one of said stator power control members is connected to one of said terminal ports by a wire.

10. A power tool comprising the motor apparatus of any one of claims 1 to 9, and further comprising:

a housing having an opening;