Hall speed control signal switch

Abstract

The application provides a Hall speed regulating switch, which comprises a Hall element and a special-shaped magnetic element moving towards or away from the Hall element, and the special-shaped magnetic element can make the magnetic field intensity sensed by the Hall element gently increase or decrease during the movement of the special-shaped magnetic element towards or away from the Hall element. Thus, the output voltage of the speed regulating switch gently increases or decreases, and the motor is controlled to gently speed up, so as to prevent the hands of the operator from being sprained, and the safety and reliability are further improved.

Description

Technical Field

[0001] This invention relates to the field of signal switch technology, and more specifically to a Hall effect speed control signal switch. Background Technology

[0002] Speed ​​control switches are widely used in power tools, such as handheld drills and electric screwdrivers. A Hall effect speed control switch is one type of speed control switch, comprising a handle, a magnet, and a Hall element. The magnet is fixed to the handle, and the Hall element is located on the circuit board. When the magnet moves closer to or away from the Hall element due to the handle's movement, the Hall element senses the change in the magnet's magnetic field strength and outputs a corresponding speed control signal (i.e., the switch's output voltage also changes accordingly), thereby controlling the motor's speed and achieving motor speed regulation. The inventors discovered during actual use that the motor speed regulation is slow in the initial stroke of the handle, but rapidly increases in speed in the later stroke, causing the power tool to start quickly. This can lead to operator delays, hand injuries, and low safety performance. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the defects in the prior art where the motor starts quickly, which makes it easy for operators to not react in time and thus easily twist their hands, thereby providing a Hall speed control signal switch with high safety performance.

[0004] Therefore, the present invention provides a Hall effect speed control switch, including a Hall element and an irregularly shaped magnetic element that moves toward or away from the Hall element. During the movement of the irregularly shaped magnetic element toward or away from the Hall element, the magnetic field strength sensed by the Hall element can be gradually increased or decreased.

[0005] The irregularly shaped magnetic element can reciprocate along a straight line. The Hall element is located on one side of the direction of movement of the irregularly shaped magnetic element. The irregularly shaped magnetic element has an irregularly shaped surface facing the Hall element. When the irregularly shaped magnetic element moves in one direction, the vertical projection distance between the Hall element and the irregularly shaped surface and / or the vertical projection area of ​​the Hall element on the irregularly shaped surface changes, so that the magnetic field strength sensed by the Hall element increases or decreases gradually.

[0006] When the irregularly shaped magnetic element moves in one direction, the vertical projection area of ​​the Hall element on the irregularly shaped surface remains unchanged, and the vertical projection distance between the Hall element and the irregularly shaped surface gradually increases or decreases.

[0007] When the irregularly shaped magnetic element moves in one direction, the vertical projection distance between the Hall element and the irregularly shaped surface remains unchanged, and the vertical projection area of ​​the Hall element on the irregularly shaped surface gradually increases or decreases.

[0008] When the irregularly shaped magnetic element moves in one direction, the vertical projection distance between the Hall element and the irregularly shaped surface and the vertical projection area of ​​the Hall element on the irregularly shaped surface gradually increase or gradually decrease simultaneously.

[0009] The irregularly shaped magnetic element can reciprocate along a straight line. The Hall element is located at the front or rear end of the moving direction of the irregularly shaped magnetic element. The irregularly shaped magnetic element has an irregularly shaped surface facing the Hall element. The vertical projection distance between the irregularly shaped surface and the Hall element gradually increases or decreases from the end of the irregularly shaped surface adjacent to the Hall element to the end away from the Hall element.

[0010] The irregular surface is an inclined surface or an arc surface.

[0011] The irregular surface is trapezoidal or triangular.

[0012] The irregularly shaped magnetic element is fixed on the movable frame. One end of the movable frame is provided with a button, and the other end is provided with a spring between it and the housing. The spring is adapted to drive the movable frame to reset after the button is pressed.

[0013] The switch housing has a shield located outside the Hall element.

[0014] The technical solution of this invention has the following advantages:

[0015] 1. The Hall effect speed control switch provided by the present invention includes a Hall element and an irregularly shaped magnetic element that moves toward or away from the Hall element. During the movement of the irregularly shaped magnetic element toward or away from the Hall element, the magnetic field strength sensed by the Hall element can be gradually increased or decreased, thereby gradually increasing or decreasing the output voltage of the speed control switch, thereby controlling the motor to adjust the speed smoothly, thus ensuring that the operator's hand is not easily twisted, and further improving safety and reliability.

[0016] 2. The Hall effect speed control switch provided by the present invention has a Hall element located on one side of the moving direction of an irregularly shaped magnetic element. The irregularly shaped magnetic element has an irregularly shaped surface facing the Hall element. When the irregularly shaped magnetic element moves in one direction, the inventors ingeniously change the vertical projection distance between the Hall element and the irregularly shaped surface and / or the vertical projection area of ​​the Hall element on the irregularly shaped surface, so that the magnetic field strength sensed by the Hall element increases or decreases gradually, thereby controlling the motor to adjust its speed gradually.

[0017] 3. The Hall effect speed control switch provided by the present invention, when the irregular magnetic element moves in one direction, the vertical projection area of ​​the Hall element on the irregular surface remains unchanged, and the vertical projection distance between the Hall element and the irregular surface gradually increases or decreases, thereby causing the magnetic field strength sensed by the Hall element to increase or decrease smoothly, thereby controlling the motor to adjust the speed smoothly.

[0018] 4. The Hall effect speed control switch provided by the present invention, when the irregular magnetic element moves in one direction, the vertical projection distance between the Hall element and the irregular surface and the vertical projection area of ​​the Hall element on the irregular surface gradually increase or decrease synchronously, thereby causing the magnetic field strength sensed by the Hall element to increase or decrease smoothly, thereby controlling the motor to adjust the speed smoothly. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the Hall effect speed control switch of the present invention;

[0021] Figure 2 A schematic diagram of the first embodiment of the irregularly shaped magnetic element and the Hall element;

[0022] Figure 3 This is a schematic diagram of the first embodiment of the irregularly shaped magnetic element;

[0023] Figure 4 This is a schematic diagram of a second embodiment of an irregularly shaped magnetic element;

[0024] Figure 5 This is a schematic diagram showing the stroke and switch output voltage of the irregularly shaped magnetic element of the present invention;

[0025] Figure 6 This is a schematic diagram of a third embodiment of an irregularly shaped magnetic element;

[0026] Figure 7 This is a schematic diagram of a fourth embodiment of an irregularly shaped magnetic element;

[0027] Figure 8 This is a schematic diagram of the fifth embodiment of the irregularly shaped magnetic element;

[0028] Figure 9 This is a schematic diagram of the structure of a cuboid magnetic component and a circuit board in the prior art.

[0029] Figure 10 This is a schematic diagram showing the stroke and switching output voltage of a cuboid magnetic element in the prior art;

[0030] Figure 11 A 3D view of a Hall effect speed control switch;

[0031] Figure 12 This is an exploded view of the Hall effect speed control switch.

[0032] Explanation of reference numerals in the attached drawings: 1. Hall element; 2. Irregularly shaped magnetic element; 3. Irregularly shaped surface; 4. Movable frame; 5. Button; 6. Housing; 7. Spring; 8. Circuit board; 9. Shielding cover. Detailed Implementation

[0033] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not 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 invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0036] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0037] Example 1

[0038] This embodiment provides a Hall effect speed control switch, such as... Figure 1 As shown, it includes a housing 6, a button 5, a movable frame 4, a spring 7, a Hall element 1, and an irregularly shaped magnetic element 2.

[0039] The movable frame 4 is installed vertically within the housing 6, such as... Figure 1As shown, a button 5 is provided on the top of the movable frame 4, and it moves downward relative to the housing 6 under the drive of the button 5. A spring 7 is provided between the top of the movable frame 4 and the bottom wall of the housing 6. The spring 7 stores energy when the movable frame 4 moves downward, and releases energy after the pressure of the button 5 is removed, driving the movable frame 4 to move upward. The movable frame 4 is formed with a mounting groove that matches the shape of the irregular magnetic element 2. The irregular magnetic element 2 moves up and down with the movable frame 4.

[0040] like Figure 2 As shown, Hall element 1 is disposed on circuit board 8 and located on one side of the moving direction of irregular magnetic element 2.

[0041] Irregular magnetic element 2, such as Figure 2 As shown, the irregularly shaped surface 3 faces the Hall element 1. When the irregularly shaped magnetic element 2 moves in one direction, the vertical projection area of ​​the Hall element 1 on the irregularly shaped surface 3 remains constant, while the vertical projection distance between the Hall element 1 and the irregularly shaped surface 3 gradually increases. In this embodiment, as... Figure 3 As shown, the irregularly shaped magnetic element 2 is a three-dimensional trapezoid, and the irregularly shaped surface 3 is an inclined plane. In this embodiment, the left side of the irregularly shaped magnetic element 2 is the N pole, and the right side (that is, the side where the irregularly shaped surface 3 is located) is the S pole. As a variable implementation, the upper end of the irregularly shaped magnetic element 2 can also be set as the N pole and the lower end as the S pole.

[0042] As a variable implementation method, such as Figure 4 As shown (4a is a perspective view of the irregular magnetic element, 4b is a front view of the irregular magnetic element), the irregular surface 3 can be an arc surface.

[0043] As a variable implementation, the vertical projection area of ​​the Hall element 1 on the irregular surface 3 gradually decreases.

[0044] like Figure 11 and 12 As shown, the switch housing 6 has a shield 9 located outside the Hall element 1. The shield 9 is made of magnetic shielding material, which can protect the Hall element from external magnetic field interference.

[0045] In this application, Figure 5 For example, in the first half of the stroke, after the irregularly shaped magnetic element 2 has traveled a certain long distance, the Hall element starts generating a speed regulation signal from point A, and the motor does not start during this process; in the second half of the stroke, as the irregularly shaped magnetic element 2 moves downward, the vertical projection distance between the Hall element 1 and the irregularly shaped surface 3 gradually decreases (e.g., Figure 2 As shown, the vertical projection distance changes from D1 to D2), thus causing the magnetic field strength sensed by Hall element 1 to increase gradually, and the output voltage of the switch to change gradually, achieving smooth speed regulation of the motor. It should be noted that in existing Hall speed control switches, such as... Figure 9As shown, magnetic element 2 is a cuboid or cylinder. When the cuboid or cylinder magnetic element 2 moves downwards, as... Figure 10 As shown, similarly, in the first half of the stroke, the Hall element only starts to generate a speed regulation signal after the magnetic element 2 has traveled a certain long stroke, and the motor does not start during this process; in the second half of the stroke, as the magnetic element 2 gradually approaches the Hall element 1, the output voltage of the switch will increase rapidly within a shorter stroke, thereby causing the motor speed to change rapidly, and the power tool to start quickly.

[0046] Example 2

[0047] This embodiment provides a Hall effect speed control switch, such as... Figure 1 As shown, it includes a housing 6, a button 5, a movable frame 4, a spring 7, a Hall element 1, and an irregularly shaped magnetic element 2.

[0048] The movable frame 4 is installed vertically within the housing 6, such as... Figure 1 As shown, a button 5 is provided on the top of the movable frame 4, and it moves downward relative to the housing 6 under the drive of the button 5. A spring 7 is provided between the top of the movable frame 4 and the bottom wall of the housing 6. The spring 7 stores energy when the movable frame 4 moves downward, and releases energy after the pressure of the button 5 is removed, driving the movable frame 4 to move upward. The movable frame 4 is formed with a mounting groove that matches the shape of the irregular magnetic element 2. The irregular magnetic element 2 moves up and down with the movable frame 4.

[0049] like Figure 6 As shown in d, the Hall element 1 is disposed on the circuit board 8 and is located on one side of the moving direction of the irregular magnetic element 2.

[0050] Figure 6 a is a 3D view of the irregularly shaped magnetic element 2. Figure 6 b is the right view of the irregularly shaped magnetic element 2. Figure 6 c is the front view of the irregular magnetic element 2.

[0051] like Figure 6 As shown, the irregularly shaped magnetic element 2 has an irregularly shaped surface 3 facing the Hall element 1. When the irregularly shaped magnetic element 2 moves in one direction, the vertical projection distance between the Hall element 1 and the irregularly shaped surface 3 remains unchanged, and the vertical projection area of ​​the Hall element 1 on the irregularly shaped surface 3 gradually increases. The irregularly shaped surface 3 is trapezoidal or triangular, or it can be any other shape where the size gradually increases or decreases from the bottom to the top. In this embodiment, the left side of the irregularly shaped magnetic element 2 is the N pole, and the right side (i.e., the side where the irregularly shaped surface 3 is located) is the S pole. As a possible implementation, the upper end of the irregularly shaped magnetic element 2 can also be set as the N pole, and the lower end as the S pole. It should be noted that the schematic diagram of the relationship between the irregularly shaped magnetic element 2 and the switch output voltage in this embodiment is similar to that in Embodiment 1, and therefore omitted.

[0052] As a variable implementation, the vertical projection distance between the Hall element 1 and the irregular surface 3 remains unchanged, while the vertical projection area of ​​the Hall element 1 on the irregular surface 3 gradually decreases.

[0053] Example 3

[0054] This embodiment provides a Hall effect speed control switch, such as... Figure 1 As shown, it includes a housing 6, a button 5, a movable frame 4, a spring 7, a Hall element 1, and an irregularly shaped magnetic element 2.

[0055] The movable frame 4 is installed vertically within the housing 6, such as... Figure 1 As shown, a button 5 is provided on the top of the movable frame 4, and it moves downward relative to the housing 6 under the drive of the button 5. A spring 7 is provided between the top of the movable frame 4 and the bottom wall of the housing 6. The spring 7 stores energy when the movable frame 4 moves downward, and releases energy after the pressure of the button 5 is removed, driving the movable frame 4 to move upward. The movable frame 4 is formed with a mounting groove that matches the shape of the irregular magnetic element 2. The irregular magnetic element 2 moves up and down with the movable frame 4.

[0056] Hall element 1 is disposed on circuit board 8 and located on one side of the moving direction of irregular magnetic element 2.

[0057] Figure 7 a is a 3D view of the irregularly shaped magnetic element 2. Figure 7 b is the right view of the irregularly shaped magnetic element 2. Figure 7 c is the front view of the irregular magnetic element 2.

[0058] like Figure 7 As shown, the irregularly shaped magnetic element 2 has an irregularly shaped surface 3 facing the Hall element 1. When the irregularly shaped magnetic element 2 moves in one direction, the vertical projection distance between the Hall element 1 and the irregularly shaped surface 3 and the vertical projection area of ​​the Hall element 1 on the irregularly shaped surface 3 gradually increase synchronously. Figure 7 As shown in b, the shape of the irregular surface 3 gradually increases in size from its bottom to its top, and the irregular surface 3 is inclined. It should be noted that the schematic diagram of the relationship between the irregular magnetic element 2 and the switch output voltage in this embodiment is similar to that in embodiment 1, so it is omitted.

[0059] The vertical projection distance between the Hall element 1 and the irregular surface 3 and the vertical projection area of ​​the Hall element 1 on the irregular surface 3 gradually decrease synchronously.

[0060] Example 4

[0061] This embodiment provides a Hall effect speed control switch, such as... Figure 1 As shown, it includes a housing 6, a button 5, a movable frame 4, a spring 7, a Hall element 1, and an irregularly shaped magnetic element 2.

[0062] The movable frame 4 is installed vertically within the housing 6, such as... Figure 1 As shown, a button 5 is provided on the top of the movable frame 4, and it moves downward relative to the housing 6 under the drive of the button 5. A spring 7 is provided between the top of the movable frame 4 and the bottom wall of the housing 6. The spring 7 stores energy when the movable frame 4 moves downward, and releases energy after the pressure of the button 5 is removed, driving the movable frame 4 to move upward. The movable frame 4 is formed with a mounting groove that matches the shape of the irregular magnetic element 2. The irregular magnetic element 2 moves up and down with the movable frame 4.

[0063] like Figure 8 As shown, Hall element 1 is disposed on circuit board 8 and is located at the front or rear end of the moving direction of irregular magnetic element 2.

[0064] The irregularly shaped magnetic element 2 has an irregularly shaped surface 3 facing the Hall element 1. The vertical projection distance between the irregularly shaped surface 3 and the Hall element 1 gradually increases or decreases from the end of the irregularly shaped surface 3 adjacent to the Hall element 1 towards the end away from the Hall element 1. The irregularly shaped surface 3 is a sloped surface or an arc surface. In this embodiment, the irregularly shaped magnetic element 2 is a three-dimensional trapezoid, and the irregularly shaped surface 3 is a sloped surface or an arc surface. It should be noted that in this embodiment, the steepness of the curve of the irregularly shaped magnetic element 2 between point A and point B is between that of the prior art and Embodiment 1.

[0065] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A Hall speed regulation switch, characterized in that The application relates to a switch comprising a Hall element (1) and a special-shaped magnetic element (2) moving towards or away from the Hall element (1), wherein the special-shaped magnetic element (2) can make the magnetic field intensity sensed by the Hall element (1) increase or decrease gently during the movement of the special-shaped magnetic element (2) towards or away from the Hall element (1). The special-shaped magnetic element (2) can move back and forth along a straight line, the Hall element (1) is located on one side of the moving direction of the special-shaped magnetic element (2), the special-shaped magnetic element (2) has a special-shaped surface (3) facing the Hall element (1), wherein when the special-shaped magnetic element (2) moves in one direction, the vertical projection distance between the Hall element (1) and the special-shaped surface (3) and / or the vertical projection area of the Hall element (1) on the special-shaped surface (3) changes, so that the magnetic field intensity sensed by the Hall element (1) increases or decreases gently. The size of the special-shaped surface (3) gradually increases from the bottom end to the top end of the special-shaped magnetic element (2). When the special-shaped magnetic element (2) moves in one direction, the vertical projection area of the Hall element (1) on the special-shaped surface (3) remains unchanged, and the vertical projection distance between the Hall element (1) and the special-shaped surface (3) gradually increases or gradually decreases. Alternatively, when the special-shaped magnetic element (2) moves in one direction, the vertical projection distance between the Hall element (1) and the special-shaped surface (3) remains unchanged, and the vertical projection area of the Hall element (1) on the special-shaped surface (3) gradually increases or gradually decreases. Alternatively, when the special-shaped magnetic element (2) moves in one direction, the vertical projection distance between the Hall element (1) and the special-shaped surface (3) and the vertical projection area of the Hall element (1) on the special-shaped surface (3) gradually increase or gradually decrease synchronously.

2. The Hall speed regulation switch according to claim 1, characterized in that The special-shaped magnetic element (2) can move back and forth along a straight line, the Hall element (1) is located at the front end or the rear end of the moving direction of the special-shaped magnetic element (2), the special-shaped magnetic element (2) has a special-shaped surface (3) facing the Hall element (1), and the vertical projection distance between the special-shaped surface (3) and the Hall element (1) gradually increases or gradually decreases from one end of the special-shaped surface (3) adjacent to the Hall element (1) to the other end away from the Hall element (1).

3. A Hall speed regulation switch according to claim 1 or 2, characterised in that The special-shaped surface (3) is a slope or an arc surface.

4. The Hall speed regulation switch according to claim 1, characterized in that The special-shaped surface (3) is a trapezoid or a triangle.

5. The Hall speed regulation switch according to claim 1, characterized in that The special-shaped magnetic element (2) is fixed on a movable frame (4), one end of the movable frame (4) is provided with a button (5), and a spring (7) is arranged between the other end of the movable frame (4) and a shell (6), and the spring (7) is suitable for driving the movable frame (4) to reset after the pressing force of the button (5) is removed.

6. The Hall speed regulation switch according to claim 1, characterized in that The shell (6) of the switch is provided with a shielding cover (9) arranged outside the Hall element (1).

Images