Electric tool motor with switch

Abstract

This application discloses a power tool motor with a switch, characterized in that it includes: a motor body, with two terminals at one end of the motor body away from the output end, the two terminals being connected to a power harness, and a switch device and a power plug connected to the end of the power harness. The switch device is used to control the start / stop of the motor body when the switch is released. Using this method, by connecting the power harness to the motor body, and the power harness having a power connector, user needs are met. Furthermore, the power harness also has a switch device that enables rapid electric braking, reducing wear on the carbon brushes / commutator and improving the safety and accuracy of operation. The switch device also has a protection mechanism, enhancing overall service life and reliability. Moreover, it does not require changes to the core internal design of the motor, making it easy to implement and promote.

Description

Technical Field

[0001] This utility model relates to the field of micro DC motor technology, and in particular to a power tool motor with a switch. Background Technology

[0002] Miniature DC motors generally consist of a stator, rotor, and end caps. To facilitate mass production and product interchangeability, their external appearances are largely similar. The interface between the end caps and the power supply is primarily achieved through motor terminal plug-in or soldered wire connection. However, with the diversification of market demands and the increasing sophistication of customer requirements, more and more customers are requesting that the motors be equipped with switches and plugs on their power cords at the factory. This necessitates addressing how to ensure the rapid braking, rapid starting and stopping, and long service life of power tool motors.

[0003] Current technologies for improving the rapid start-stop and long-term operating life of motors generally focus on optimizing carbon brushes and commutators, designing armature windings and power supplies, and designing mechanical structures. However, optimizing carbon brushes and commutators, and designing mechanical structures, often result in high costs and low efficiency when addressing these issues. Furthermore, as the torque requirements of power tools increase, stricter requirements are placed on the design of carbon brushes, commutators, and motor mechanical structures. This is primarily because carbon brushes and commutators experience severe wear under high torque conditions, reducing the normal lifespan of the motor. Moreover, brushed motor mechanical structures have been refined over a long period and are now a mature design used in production and daily life. Abruptly changing the design can lead to various incompatibilities that are difficult to resolve.

[0004] Therefore, there is an urgent need to design a power tool motor with a switch to solve one or more technical problems that are lacking in the existing technology. Summary of the Invention

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is: an electric tool motor with a switch, characterized in that it includes: a motor body, two terminals are provided at one end of the motor body away from the output end, the two terminals are connected to a power harness, the end of the power harness is connected to a switch device and a power plug, and the switch device is used to control the start / stop of the motor body when the switch is released.

[0006] In a preferred embodiment, the end of the motor body with the terminal is further provided with an end cover, the end cover is snapped into the motor body, the two terminals are snapped into the end cover respectively, and the first end of the power harness is connected to the terminal by welding or plugging.

[0007] In a preferred embodiment, the switching device also integrates an overcurrent protection element and / or a temperature detection interface for cutting off the motor power supply when overcurrent or overheating is detected.

[0008] In a preferred embodiment, the end cap is also provided with a control signal interface.

[0009] The beneficial effects of this utility model are as follows: by connecting a power harness to the motor body, and the power harness being equipped with a power connector, the user's needs are met. Furthermore, a switching device is provided on the power harness, and the switching device enables rapid electric braking, reducing the braking wear of the carbon brushes / commutator and improving the safety and accuracy of operation. The switching device also has a protection mechanism, which enhances the overall service life and reliability. Moreover, it does not require any changes to the core internal design of the motor, making it easy to implement and promote. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of this utility model.

[0011] In the picture: 10. Motor body; 11. End cover; 12. Terminal; 13. Power harness; 14. Switching device; 15. Power plug. Detailed Implementation

[0012] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0013] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connection" and "installation" should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. Furthermore, "connection" can be a direct connection or an indirect connection through an intermediate medium. "Fixed" means that the relative positional relationship remains unchanged after the connection. The directional terms mentioned in the embodiments of this utility model, such as "inner," "outer," "top," and "bottom," are only for reference to the directions in the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of this utility model, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model.

[0014] In this embodiment of the invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" and "second" may explicitly or implicitly include one or more of that feature.

[0015] In this embodiment of the utility model, "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0016] References to "one embodiment" or "some embodiments" as used in this specification mean that one or more embodiments of the present invention include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0017] like Figure 1 As shown, this utility model provides an electric tool motor with a switch, characterized in that it includes: a motor body 10, the motor body 10 having two terminals 12 at one end away from the output end, the two terminals 12 being connected to a power harness 13, the end of the power harness 13 being connected to a switch device 14 and a power plug 15, the switch device 14 being used to control the start / stop of the motor body 10 when the switch is released; Specifically, the motor body 10 has an end cover 11 at the end away from the output end. The end cover 11 is snapped or welded to the motor body 10. Two terminals 12 are snapped and fixed on the end cover 11, namely the positive terminal 12 and the negative terminal 12. A power harness 13 is connected to the two terminals 12. The power harness 13 is soldered to the terminals 12. The end of the power harness 13 is provided with a switch device 14 and a power plug 15. The switch device 14 is used to control the circuit to open / close when the switch is released, thereby starting / stopping the motor body 10.

[0018] To prevent the motor body 10 from burning out due to prolonged operation under abnormal conditions such as stall, overload, or poor heat dissipation, an overcurrent protection element (not shown in the figure) is also provided in the switch device 14. This overcurrent protection element is a positive temperature coefficient thermistor to protect the motor and improve the overall service life and reliability. A groove can also be opened in the end cover 11 to place a temperature detection element. At the same time, a temperature detection interface is integrated in the switch device 14 to connect with the temperature detection element for monitoring the motor temperature. When the temperature exceeds a predetermined value, the power supply is cut off.

[0019] It should be noted that a motor braking circuit can also be provided within the switch device 14. An auxiliary contact inside the switch device 14 or a simple external circuit can momentarily short-circuit terminal 12 or connect it to a reverse electromotive force discharge circuit (such as through a low-resistance power resistor). This utilizes the motor's back electromotive force to generate a powerful braking torque, achieving millisecond-level rapid braking. This braking method is much faster than simply stopping by mechanical friction or inertia after power failure, and it does not rely on or significantly reduces braking wear on the carbon brushes / commutator. The short-circuit / energy-consuming braking triggered by the switch release action significantly shortens the braking time, improving the safety and accuracy of tool operation. In summary, by connecting the power harness 13 to the motor body 10, and the power harness 13 having a power connector, user needs are met. Furthermore, the power harness 13 is equipped with a switch device 14, which enables rapid electric braking, reducing wear on the carbon brushes / commutator and improving the safety and accuracy of operation. The switch device 14 also has a protection mechanism, enhancing overall service life and reliability. Moreover, it does not require changes to the core internal design of the motor, making it easy to implement and promote.

[0020] This invention is not limited to the description in the specification and embodiments. Therefore, other advantages and modifications can be readily realized by those skilled in the art. Thus, without departing from the spirit and scope of the general concept as defined by the claims and their equivalents, this invention is not limited to the specific details, representative devices and illustrated examples shown and described herein.

Claims

1. A power tool motor with a switch, characterized in that, include: The motor body has two terminals at one end away from the output end. The two terminals are connected to a power harness. The end of the power harness is connected to a switch and a power plug. The switch is used to control the start / stop of the motor body when the switch is released.

2. The power tool motor with switch according to claim 1, characterized in that, The motor body has an end cap at one end where the terminal is located. The end cap is snapped into the motor body. The two terminals are snapped into the end cap respectively. The first end of the power harness is connected to the terminal by welding or plugging.

3. The power tool motor with switch according to claim 1, characterized in that, The switching device also integrates overcurrent protection elements and / or temperature detection interfaces to cut off the motor power supply when overcurrent or overheating is detected.

4. The power tool motor with switch according to claim 2, characterized in that, The end cap also has a reserved control signal interface.

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