Ultra-thin linear motor

Abstract

The application relates to the technical field of motor equipment, in particular to an ultrathin linear motor. The ultrathin linear motor comprises a base, a coil assembly, an iron core, a magnet and a yoke cover plate; the coil assembly and the iron core are fixed to the base, the magnet is fixed to the yoke cover plate, the magnet is oppositely arranged with the coil assembly, and the surface of the yoke cover plate, which is away from the magnet, is the outer surface of the ultrathin linear motor. The ultrathin linear motor provided by the application has high adaptability, can be applied to more occasions, and is more suitable for scenes in which multiple motors need to be stacked and matched in the thickness direction; in addition, the ultrathin linear motor has high durability and reliability and low cost.

Description

Technical Field

[0001] This invention relates to the field of motor equipment technology, and more specifically, to an ultra-thin linear motor. Background Technology

[0002] A linear motor is a type of motor that converts electrical energy into linear mechanical energy, and can be used to drive mechanisms that move in a straight line.

[0003] Existing linear motors are relatively thick, limiting their applications, especially when multiple motors need to be stacked together in the thickness direction. In addition, during operation, the cables connected to the coil assembly are repeatedly pulled along with the coil assembly, making them prone to damage. This results in poor durability and reliability of the linear motor.

[0004] In summary, overcoming the aforementioned shortcomings of existing linear motors is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide an ultra-thin linear motor to alleviate the technical problem of excessive thickness in existing linear motors.

[0006] The ultra-thin linear motor provided by the present invention includes a base, a coil assembly, an iron core, a magnet, and a magnetic yoke cover.

[0007] The coil assembly and the iron core are fixed to the base, the magnet is fixed to the magnetic yoke cover plate, the magnet is arranged opposite to the coil assembly, and the surface of the magnetic yoke cover plate facing away from the magnet is the outer surface of the ultra-thin linear motor.

[0008] Preferably, as one possible implementation, the ultra-thin linear motor further includes a linear guide rail and at least two sliders, the sliders being fixed to the base, the linear guide rail being fixed relative to the magnetic yoke cover plate, and both sliders being slidably engaged with the linear guide rail.

[0009] Preferably, as one possible implementation, the base has a groove for accommodating the magnetic encoder of the ultra-thin linear motor at the portion between two adjacent sliders.

[0010] Preferably, as one possible implementation, a wiring groove is provided at one end of the base, and a partition is provided in the wiring groove to separate the wires connecting the magnetic encoder from the coil power supply wires.

[0011] Preferably, as one possible implementation, the base has a base body and an end cap, the end cap is fixedly connected to the base body, the end cap has a groove-shaped structure, and the coil assembly and the iron core are both installed in the groove of the end cap.

[0012] Preferably, as one possible implementation, the circuit board of the ultra-thin linear motor is mounted in the groove of the end cap.

[0013] Preferably, as one possible implementation, a notch is provided on the groove wall of the end cap, through which the circuit board can extend.

[0014] The bottom of the end cap protrudes from the groove wall, and a limiting protrusion is provided at the part of the bottom of the end cap outside the groove. The two sides of the notch and the limiting protrusion are used to limit the circuit board.

[0015] Preferably, as one possible implementation, the ultrathin linear motor further includes a mover frame, the magnetic yoke cover plate is fixed to the mover frame, and the density of the mover frame is less than the density of the magnetic yoke cover plate.

[0016] Preferably, as one possible implementation, a stop is fixedly provided on the moving frame, and a clearance groove is provided on the base. The stop cooperates with the clearance groove, and the groove wall of the clearance groove is used to block the stop when the moving frame moves to the extreme position.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] The ultra-thin linear motor provided by this invention mainly consists of a base, a coil assembly, an iron core, a magnet, and a magnetic yoke cover plate. The coil assembly and the iron core are fixed to the base, and the magnet is fixed to the magnetic yoke cover plate. The magnet and the coil assembly are arranged opposite to each other so that magnetic force can be generated between the magnet and the coil assembly, thereby realizing the function of converting electrical energy into linear motion mechanical energy.

[0019] In particular, the surface of the magnetic yoke cover plate facing away from the magnet serves as the outer surface of the ultra-thin linear motor, which is equivalent to the magnetic yoke directly serving as the cover plate. There is no need to add a cover plate in the thickness direction. As a result, the ultra-thin linear motor provided by the present invention has a smaller thickness, stronger adaptability, wider application, and is more suitable for scenarios where multiple motors need to be stacked and cooperate in the thickness direction.

[0020] Furthermore, when the ultra-thin linear motor provided by this invention is in operation, the base remains stationary, that is, the coil assembly remains stationary, while the magnet and the magnetic yoke cover plate move in a straight line. As a result, the cable connected to the coil assembly will not be repeatedly pulled, and the cable is not easily damaged. This improves the durability and reliability of the linear motor. Moreover, it also reduces the requirements for the cable, thereby reducing costs. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0022] Figure 1 A three-dimensional structural diagram of the ultrathin linear motor provided by the present invention;

[0023] Figure 2 A three-dimensional structural diagram of the ultrathin linear motor provided by the present invention in another state;

[0024] Figure 3 A cross-sectional view of the ultrathin linear motor provided by the present invention;

[0025] Figure 4 Exploded view of the ultrathin linear motor provided by the present invention;

[0026] Figure 5 A schematic diagram of the assembly structure of the base body and the slider in the ultra-thin linear motor provided by the present invention;

[0027] Figure 6 A three-dimensional structural diagram of the base body in the ultra-thin linear motor provided by the present invention;

[0028] Figure 7 This is a schematic diagram of the assembly structure of the end cap and circuit board in the ultra-thin linear motor provided by the present invention.

[0029] Figure 8 This is a three-dimensional structural diagram of the end cap in the ultra-thin linear motor provided by the present invention.

[0030] Explanation of reference numerals in the attached figures:

[0031] 100-Base; 110-Base body; 111-Groove; 112-Cable routing groove; 113-Partition; 114-Allowing groove; 120-End cap; 121-Notch; 122-Limiting protrusion;

[0032] 200-coil assembly;

[0033] 300-iron core;

[0034] 400-Magnet;

[0035] 500-Magnetic yoke cover plate;

[0036] 600-Linear Guide;

[0037] 700-slider;

[0038] 800-Magnetic Encoder;

[0039] 900 - Circuit Board;

[0040] 1000 - Moving part frame; 1010 - Stopping part. Detailed Implementation

[0041] 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.

[0042] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" 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.

[0043] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings.

[0044] See Figures 1-4 This embodiment provides an ultra-thin linear motor, which mainly consists of a base 100, a coil assembly 200, an iron core 300, a magnet 400, and a magnetic yoke cover plate 500. The coil assembly 200 and the iron core 300 are fixed to the base 100, and the magnet 400 is fixed to the magnetic yoke cover plate 500. The magnet 400 and the coil assembly 200 are arranged opposite to each other so that magnetic force can be generated between the magnet 400 and the coil assembly 200, thereby realizing the function of converting electrical energy into linear motion mechanical energy.

[0045] In particular, the surface of the magnetic yoke cover plate 500 facing away from the magnet 400 serves as the outer surface of the ultra-thin linear motor, which is equivalent to the magnetic yoke directly serving as the cover plate. There is no need to add a cover plate in the thickness direction. As a result, the ultra-thin linear motor provided by the present invention has a smaller thickness, stronger adaptability, wider application, and is more suitable for scenarios where multiple motors need to be stacked and cooperate in the thickness direction.

[0046] Furthermore, when the ultra-thin linear motor provided in this embodiment is working, the base 100 remains stationary, that is, the coil assembly 200 remains stationary, while the magnet 400 and the magnetic yoke cover plate 500 move in a straight line. As a result, the cable connected to the coil assembly 200 will not be repeatedly pulled, and the cable is not easily damaged. This improves the durability and reliability of the linear motor and reduces the requirements for the cable, thereby reducing costs.

[0047] See Figures 1-4 In the specific structure of the ultra-thin linear motor provided in this embodiment, a linear guide rail 600 and at least two sliders 700 are also provided. The sliders 700 are fixed to the base 100, and the linear guide rail 600 is fixed relative to the magnetic yoke cover plate 500 (including direct fixing and indirect fixing). Both sliders 700 are slidably engaged with the linear guide rail 600, so that the magnetic yoke cover plate 500 can move in a straight line relative to the base 100.

[0048] When the ultra-thin linear motor provided in this embodiment is working, the slider 700 is fixed with the coil assembly 200. The attraction force generated between the coil assembly 200 and the magnet 400 acts between the linear guide rail 600 and the slider 700. Based on the above structure, the pressure on the slider 700 from the linear guide rail 600 remains stable. At the same time, the force on all parts of the linear guide rail 600 is stable throughout the entire movement. Therefore, the moving structure will not tilt and has good parallelism.

[0049] See Figure 4 and Figure 5 In this embodiment, the slider 700 is fixed on the base 100. There is a region between the two sliders 700. In this embodiment, a groove 111 for accommodating the magnetic encoder 800 of the linear motor is opened in the part of the base 100 between the two sliders 700. In this way, the thickness occupied by the base body 110 can be fully utilized to further reduce the overall thickness of the ultra-thin linear motor.

[0050] Specifically, see Figure 3 and Figure 6 A wiring groove 112 can be provided at one end of the base 100, through which the wires connecting the magnetic encoder 800 and the coil power supply wires can extend into the groove of the end cover 120 and connect to the corresponding structure (magnetic encoder 800 or coil assembly 200).

[0051] Preferably, a partition 113 can be provided in the wiring trough 112 to separate the wires connecting the magnetic encoder 800 from the coil power supply wires.

[0052] It should be noted that the voltage in the wires connecting the magnetic encoder 800 is low voltage, typically 5V; while the voltage in the coil power supply wires is high voltage, typically 24V or 48V. Therefore, by setting up a partition 113 between the two, the wires connecting the magnetic encoder 800 and the coil power supply wires can be separated, preventing the low-voltage wires from getting tangled with the high-voltage wires and causing interference, thus ensuring high reliability.

[0053] Specifically, the partition 113 can be set to be parallel to the thickness direction of the ultra-thin linear motor, which helps to improve the structural strength.

[0054] See Figure 3 , Figure 4 , Figure 7 and Figure 8 In the specific structure of the base 100, a base body 110 and an end cap 120 can be provided. The end cap 120 is fixedly connected to the base body 110. The end cap 120 is set as a groove structure, and the coil assembly 200 and the iron core 300 are installed in the groove of the end cap 120. In this way, the groove wall of the end cap 120 can surround the coil assembly 200 and the iron core 300. Thus, the groove wall of the end cap 120 can limit the coil assembly 200 and the iron core 300 and protect the coil assembly 200 and the iron core 300, resulting in stronger structural reliability.

[0055] Further, see Figure 7 The linear motor circuit board 900 can be installed in the slot of the end cover 120, which facilitates the integration of the coil assembly 200, iron core 300, circuit board 900 and end cover 120, and improves mass production capability. In addition, the slot wall of the end cover 120 can also limit and protect the circuit board 900, which helps to ensure the reliable operation of the linear motor.

[0056] Specifically, a notch 121 can be made in the groove wall of the end cover 120 so that the circuit board 900 can extend out through the notch 121; the bottom of the groove of the end cover 120 is made to protrude from the groove wall, and a limiting protrusion 122 is provided at the part of the bottom of the groove of the end cover 120 located outside the groove. In this way, the two sides of the notch 121 and the limiting protrusion 122 can serve as three limiting points to limit the circuit board 900.

[0057] Preferably, the two sides of the notch 121 are staggered to improve the limiting effect on the circuit board 900.

[0058] The end cap 120 can be configured as a one-piece molded structure to reduce assembly requirements and facilitate improved performance; of course, the end cap 120 can also be assembled from several parts to reduce costs.

[0059] See Figures 1-4 In the specific structure of the linear motor provided in this embodiment, a mover frame 1000 is also provided, and the magnetic yoke cover plate 500 is fixed on the mover frame 1000. The density of the mover frame 1000 is set to be less than the density of the magnetic yoke cover plate 500. In this way, the total mass of the moving structure can be reduced without changing the shape and size of the moving structure, thereby improving the performance.

[0060] Specifically, the linear guide rail 600 can also be installed on the mover frame 1000 so that the mover frame 1000 can support the linear guide rail 600, thereby indirectly fixing the linear guide rail 600 to the magnetic yoke cover plate 500. In this way, the motion structure assembled from the mover frame 1000, the linear guide rail 600, the magnetic yoke cover plate 500 and the magnet 400 can easily obtain high structural strength and is easy to assemble.

[0061] Furthermore, a stop 1010 can be fixedly installed on the moving frame 1000. Correspondingly, a clearance groove 114 is provided on the base 100. The stop 1010 on the moving frame 1000 is engaged with the clearance groove 114 on the base 100. During the movement of the moving frame 1000, the stop 1010 can move along the clearance groove 114. When the moving frame 1000 moves to the limit position, the groove wall of the clearance groove 114 will block the stop 1010, so that the stop 1010 can no longer move forward. In turn, the moving frame 1000 can no longer move forward, thus achieving the limitation of the moving structure and preventing the moving structure from leaving the base 100.

[0062] The aforementioned mover frame 1000 can be configured as a one-piece molded structure to reduce assembly requirements and facilitate improved performance; of course, the aforementioned mover frame 1000 can also be assembled from several parts to reduce costs.

[0063] Specifically, the slider 700 and the base 100 can be fixed by threaded connection or adhesive bonding, with threaded connection being preferred due to its higher reliability.

[0064] Specifically, a plurality of first threaded holes are formed on the slider 700, and a plurality of first through holes are formed on the base 100. A first screw passes through the first through hole on the base and is screwed into the first threaded hole on the slider 700 to fix the slider 700 to the base 100. Of course, a scheme to change the orientation of the first screw is also within the protection scope of this invention.

[0065] Accordingly, the linear guide rail and the mover frame can be fixed by threaded connection or adhesive bonding, with threaded connection being preferred due to its higher reliability.

[0066] Specifically, several second through holes are formed on the linear guide 600, and several second threaded holes are formed on the mover frame 1000. A second screw passes through the second through holes on the linear guide 600 and is screwed into the second threaded holes on the mover frame 1000, thereby fixing the linear guide 600 to the mover frame 1000. Of course, changing the orientation of the second screw is also within the scope of this invention.

[0067] In addition, several third through holes can be opened on the stop 1010 and several third threaded holes can be opened on the mover frame 1000. The third screw is passed through the third through hole on the stop 1010 and screwed into the third threaded hole on the mover frame 1000 to fix the stop 1010 and the mover frame 1000.

[0068] In summary, this invention discloses an ultra-thin linear motor that overcomes many technical defects of traditional linear motors. The ultra-thin linear motor provided by this invention has strong adaptability, can be applied in a wider range of situations, and is more suitable for scenarios requiring multiple motors to be stacked and coordinated in the thickness direction; furthermore, it has high durability and reliability, and low cost.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An ultra-thin linear motor, characterized by, It comprises a base (100), a coil assembly (200), a core (300), a magnet (400) and a yoke cover plate (500); The coil assembly (200) and the core (300) are fixed to the base (100), the magnet (400) is fixed to the yoke cover plate (500), the magnet (400) is arranged opposite to the coil assembly (200), and the surface of the yoke cover plate (500) away from the magnet (400) is the outer surface of the ultra-thin linear motor; The base (100) has a base body (110) and an end cover (120), the end cover (120) is fixedly connected with the base body (110), the end cover (120) is a groove structure, and the coil assembly (200) and the core (300) are both installed in the groove of the end cover (120); The ultra-thin linear motor further comprises a mover frame (1000), the yoke cover plate (500) is fixed to the mover frame (1000), and the density of the mover frame (1000) is less than that of the yoke cover plate (500); Both sides of the base body (110) are respectively provided with sliding blocks (700), both sides of the mover frame (1000) are respectively provided with linear guides (600), and the linear guide (600) on any side is in sliding fit with the sliding block (700) on the corresponding side; the arrangement direction of the linear guide (600) and the sliding block (700) is consistent with the direction of the attractive force between the magnet (400) and the coil assembly (200); The circuit board (900) of the ultra-thin linear motor is installed in the groove of the end cover (120).

2. The ultra-thin linear motor of claim 1, wherein, The base (100) is provided with a groove (111) for accommodating a magnetic encoder (800) of the ultra-thin linear motor between the two adjacent sliding blocks (700).

3. The ultra-thin linear motor of claim 2, wherein, One end of the base (100) is provided with a wiring groove (112), the wiring groove (112) is provided with a partition plate (113), and the partition plate (113) is used for separating the wires connected with the magnetic encoder (800) and the coil power supply wires.

4. The ultra-thin linear motor of claim 1, wherein, The slot wall of the end cover (120) is provided with a notch (121), and the circuit board (900) can be extended out of the notch (121); The groove bottom of the end cover (120) protrudes from the slot wall, the part of the groove bottom outside the groove is provided with a limiting protrusion (122), and the two sides of the notch (121) and the limiting protrusion (122) are used for limiting the circuit board (900).

5. The ultra-thin linear motor according to any one of claims 1-4, characterized in that, The mover frame (1000) is fixedly provided with a stopper (1010), the base (100) is provided with an avoiding groove (114), the stopper (1010) cooperates with the avoiding groove (114), and the groove wall of the avoiding groove (114) is used for blocking the stopper (1010) when the mover frame (1000) moves to the limit position.

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