WO2021035830A1

WO2021035830A1 - Linear motor with coil externally nested with shell

Info

Publication number: WO2021035830A1
Application number: PCT/CN2019/105960
Authority: WO
Inventors: 郭少千; 张良威; 李志锋
Original assignee: 领先科技(东台)有限公司
Priority date: 2019-08-28
Filing date: 2019-09-16
Publication date: 2021-03-04
Also published as: CN110429787A

Abstract

A linear motor with a coil externally nested with a shell, which is characterized by comprising a housing (1), wherein the housing (1) is internally provided with a rotor assembly (2) and a stator assembly (3) corresponding to and cooperating with the rotor assembly (2), the stator assembly (3) comprises a coil (31) and an FPC board (33) for connecting the coil (31) with an external circuit, the coil (31) is externally nested with a shell (32), and the rotor assembly (2) is provided with a permanent magnet (21) corresponding to and cooperating with the coil (31). The coil (31) is externally nested with the shell (32), which improves the structural stability of the coil (31), has a safety protection function for the coil (31), increases the magnetic permeability of the overall magnetic circuit, improves the received magnetic induction intensity of the coil (31), improves the magnetic circuit of the product, improves the energy utilization rate and the vibration power of the product, effectively increases a BL value of the product, has a good vibration effect, thereby improving the stability, the reliability and the process yield of the product.

Description

Linear motor with outer coil nested shell

Technical field

The present disclosure relates to the field of motor technology, and in particular to a linear motor with a coil outer nested shell.

Background technique

With the rapid development of electronic products, especially mobile terminal devices such as mobile phones and tablet computers, these electronic devices basically use vibration generating devices to prevent noise from electronic devices from interfering with others. The traditional vibration generating device uses a rotor motor based on eccentric rotation, which realizes mechanical vibration through the rotation of an eccentric vibrator. As the eccentric vibrator rotates, the commutator and brush will produce mechanical friction and electric sparks, etc., which will affect The rotation speed of the eccentric vibrator affects the vibration effect of the device. Therefore, the vibration generating device mostly adopts a linear motor with better performance.

Linear motors, also called linear motors, linear motors, push rod motors, etc., the most commonly used linear motor types are flat plate, U-slot and tube type. It is a technology that converts electrical energy into linear motion mechanical energy. The repulsive force of the magnet makes the moving element levitate, and at the same time, the moving element is directly driven by the magnetic force. It does not need to be driven by a transmission mechanism such as a gear set like a rotary motor. Therefore, a linear motor can make the moving element driven by it perform High acceleration and deceleration reciprocating motion. With this feature, linear motors can be used in different manufacturing and processing technology fields, and used as a driving power source or as a technical content to provide positioning. In addition, with the rapid development and fierce competition of semiconductor, electronics, optoelectronics, medical equipment and automation control industries, the requirements for linear motion performance of motors in various fields are also increasing. It is expected that motors have high speed, low noise and high positioning accuracy. Therefore, linear motors have been used in many applications to replace mechanical motion methods such as traditional servo motors.

However, some existing linear motors have certain defects in their design, which lead to problems such as small vibration force, large space occupation, poor stability and reliability, etc., thereby reducing the vibration effect of the motor, and affecting the linear motor. Application and development.

Summary of the invention

In view of the above-mentioned problems of the existing linear motors, the present disclosure proposes a linear motor with a coil outer nested shell.

In order to solve at least one of the above technical problems, the present disclosure proposes the following technical solutions:

A linear motor with a coil outer nested shell, which is characterized in that it comprises a casing. A mover assembly and a stator assembly corresponding to the mover assembly are arranged in the casing. The stator assembly includes a coil and is used for the coil and an external circuit. For the connected FPC board, a shell is nested outside the coil, and the mover assembly has a permanent magnet corresponding to the coil.

The beneficial effects of the present disclosure are: the coil of the outer nested shell is in the magnetic field generated by the permanent magnet of the mover assembly, and after the external circuit energizes the coil through the FPC board, the coil interacts with the permanent magnet, so that the mover assembly is relative to the stator. The components vibrate in the vertical direction. The structure is simple, compact and stable, and it takes up small space. It is convenient to produce and assemble. The coil is nested with a shell, which not only improves the structural stability of the coil, but also has a safety protection effect on the coil. Increase the magnetic permeability of the overall magnetic circuit, increase the magnetic induction intensity of the coil, facilitate the better interaction between the permanent magnet and the coil, improve the magnetic circuit of the product, increase the energy utilization rate and vibration force of the product, and effectively increase The BL value of large products has good vibration effect, thereby improving product stability, poor reliability and process yield, facilitating mass production of products, and expanding product applications and development.

In some embodiments, the housing is made of a magnetically conductive material.

In some embodiments, the coil has a hollow cylindrical shape, the diameter of the permanent magnet is smaller than the inner diameter of the coil and one end of the permanent magnet is located in the coil, and the permanent magnet can move along the axis of the coil to vibrate the mover assembly.

In some embodiments, the permanent magnet is provided with a pole piece at one end close to the coil.

In some embodiments, the casing includes an upper casing and a lower casing, and the stator assembly is disposed on the lower casing.

In some embodiments, a third tank for accommodating the FPC board is provided on the lower casing.

In some embodiments, the bottom surface of the third groove body is provided with a positioning through hole.

In some embodiments, the mover assembly is respectively elastically connected to the upper casing and the lower casing through springs.

In some embodiments, the lower casing is formed with a first flange that cooperates with the spring and the upper casing.

In some embodiments, the mover assembly includes a mass connected to a spring, and one end of the mass close to the coil is provided with a yoke matched with a permanent magnet.

In addition, in the technical solutions of the present disclosure, unless otherwise specified, the technical solutions can be realized by using conventional means in the field.

Description of the drawings

In order to more clearly illustrate the specific embodiments of the present disclosure or the technical solutions in the prior art, the following will briefly introduce the drawings that need to be used in the specific embodiments or the description of the prior art. Obviously, the appendix in the following description The drawings are some embodiments of the present disclosure. For those of ordinary skill in the art, without creative work, other drawings can be obtained based on these drawings.

Fig. 1 is an exploded view of a linear motor with a coil outer nested housing provided by an embodiment of the disclosure.

Fig. 2 is a perspective view of a linear motor with a coil outer casing provided by an embodiment of the disclosure.

Fig. 3 is a cross-sectional view of a linear motor with a coil outer nested housing provided by an embodiment of the disclosure.

Fig. 4 is a perspective view of an upper casing provided by an embodiment of the disclosure.

Fig. 5 is a perspective view of a lower casing provided by an embodiment of the disclosure.

Fig. 6 is a perspective view of a coil and a housing provided by an embodiment of the disclosure.

The reference numerals in the drawings illustrate that the casing 1, the upper casing 11, the insertion portion 111, the pressing surface 112, the seventh tank body 113, the lower casing 12, the first flange 121, the first tank body 122, the first Three slot body 123, positioning through hole 124, sixth slot body 125, first notch 126, support portion 127, mover assembly 2, permanent magnet 21, mass 22, first hole body 221, fifth slot body 222, The yoke 23, the fourth slot body 231, the second flange 232, the pole piece 24, the stator assembly 3, the coil 31, the housing 32, the FPC board 33, the connecting portion 331, the spring 4, and the second slot body 41.

detailed description

In order to make the objectives, technical solutions, and advantages of the present disclosure clearer, the following further describes the present disclosure in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are part of the embodiments of the present disclosure, rather than all of the embodiments, and are only used to explain the present disclosure, and are not used to limit the present disclosure. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present disclosure.

In the description of the present disclosure, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", The orientation or positional relationship indicated by "both ends" and "both sides" is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the referred elements must have The specific orientation or the construction and operation in a specific orientation cannot be construed as a limitation of the present disclosure. In addition, the terms "first", "second", "upper", "lower", "primary", "secondary", etc. are only used for descriptive purposes, and can be simply used to distinguish different components more clearly, and It cannot be understood as indicating or implying relative importance.

In the description of the present disclosure, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, they can be fixed or detachable. Connected or integrally connected; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above-mentioned terms in the present disclosure can be understood in specific situations.

1 is an exploded view of a linear motor with a coil outer nested housing provided by an embodiment of the present disclosure, FIG. 2 is a perspective view of a linear motor with a coil outer nested housing provided by an embodiment of the present disclosure, and FIG. 3 is the present disclosure The embodiment provides a cross-sectional view of a linear motor with a coil outer nested housing. FIG. 4 is a perspective view of an upper housing provided by an embodiment of the disclosure, FIG. 5 is a perspective view of a lower housing provided by an embodiment of the disclosure, and FIG. 6 is The three-dimensional view of the coil and the housing provided by the embodiment of the present disclosure.

Examples:

As shown in Figures 1 to 6, a linear motor with a shell nested outside the coil includes a housing 1. A mover assembly 2 and a stator assembly 3 corresponding to the mover assembly 2 are arranged in the housing 1. The mover The assembly 2 is usually located above the stator assembly 3. The housing 1 includes an upper housing 11 and a lower housing 12. The stator assembly 3 is arranged on the lower housing 12, and the upper housing 11 and the lower housing 12 are usually welded together. The stator assembly 3 includes a coil 31. A casing 32 is nested outside the coil 31. The coil 31 and the casing 32 are usually hollow cylindrical, or other suitable shapes. The coil 31 and the casing 32 are usually fastened by glue, and the coil 31 passes through The FPC board 33 is connected to an external circuit. The coil 31 and the FPC board 33 are usually connected by glue or welding. The FPC board 33 and/or the coil 31 are usually glued and fixed on the lower casing 12. The mover assembly 2 is connected to the coil 31 corresponds to the matched permanent magnet 21. The permanent magnet 21 is usually located above the coil 31. After the coil 31 is energized, the interaction with the permanent magnet 21 can cause the mover assembly 2 to vibrate in the vertical direction. The coil 31 is nested with a shell 32, which can not only improve the structural stability of the coil 31 and the reliability of the connection between the coil 31 and related parts, but also has a safety protection effect on the coil in the event of an accidental drop of the product, and can also increase The magnetic permeability of the large overall magnetic circuit increases the magnetic induction intensity of the coil 31. The magnetic field generated by the permanent magnet 21 can better act on the coil 31, thereby increasing the interaction force between the permanent magnet 21 and the coil 31, that is, the vibration force of the product .

FPC board 33 is a flexible printed circuit board (Flexible Printed Circuit), which is a printed circuit board made of polyimide or polyester film with high reliability and excellent flexibility. The characteristics of high wiring density, light weight, thin thickness, and good bendability; permanent magnet 21 refers to a magnet that can retain high remanence for a long time in an open circuit state, and is also called a hard magnet, such as magnets, neodymium magnets, and Permanent magnets made of ferrite permanent magnet materials, etc., preferably magnetic steel, which has the characteristics of high hardness, high coercivity, high temperature resistance, strong corrosion resistance, etc., and its permanent magnet characteristics are good, after being saturated magnetized , After removing the external magnetic field, it can still maintain strong and stable magnetism for a long time.

In use, the coil 31 of the outer nested shell 32 is in the magnetic field generated by the permanent magnet 21 of the mover assembly 2. After the external circuit energizes the coil 31 through the FPC board 33, the coil 31 is subjected to a certain ampere force, and the coil 31 and The permanent magnet 21 interacts. Since the coil 31 is fixed, the permanent magnet 21 moves relative to the coil 31 under the corresponding reaction force, so that the coil 31 also cuts the magnetic lines of induction, so that the moving subassembly 2 is relative to the stator assembly 3. Vibrate in the vertical direction, that is, the vibration of the product. The present disclosure has a simple, compact and stable structure, small footprint, convenient production and assembly, etc. The coil 31 is nested with a shell 32, which can not only improve the structural stability of the coil 31 and the reliability of the connection between the coil 31 and related components, but also In the event of accidental drop of the product, it can also protect the coil, increase the magnetic permeability of the overall magnetic circuit, increase the magnetic induction intensity of the coil 31, and facilitate better interaction between the permanent magnet 21 and the coil 31 , Improve the magnetic circuit of the product, increase the energy utilization rate and vibration force of the product, effectively increase the BL value of the product, the vibration effect is good, the stability of the product, the poor reliability and the process yield are improved, and the product is convenient for mass production , Has expanded the application and development of the product. In addition, the BL value is the product of the magnetic field strength and the effective cutting length of the coil. The BL value reflects the ampere force of different motors at the same current. The larger the BL value, the greater the ampere force. The current waveform of the coil 31 can be changed. The frequency and amplitude of the vibration of the mover assembly 2 can generate different vibration sensations, rich in vibration sensations, and realize a variety of different tactile feedback, which is convenient to be applied to the power source of the tactile feedback of smart devices, and the application range of the product is increased.

The housing is made of magnetically permeable material. The magnetically permeable material can be stainless steel, silicon steel or soft magnetic alloy with good magnetic permeability, which can better increase the permeability of the overall magnetic circuit and increase the magnetic induction intensity of the coil 31 Therefore, the magnetic field generated by the permanent magnet 21 can better act on the coil 31, thereby increasing the interaction force between the permanent magnet 21 and the coil 31, that is, the vibration force of the product.

One end of the permanent magnet 21 close to the coil 31 is provided with a pole piece 24. The pole piece 24 can usually be glued or welded to the permanent magnet 21. The pole piece 24 is usually produced by itself that does not produce a magnetic field, but only transmits magnetic lines of induction in the magnetic circuit. Made of soft magnetic material, it can constrain the magnetic field generated by the permanent magnet 21 to a certain extent, make the magnetic line of induction better act on the coil 31, improve the efficiency of induction and join, thereby improving the utilization efficiency of the magnetic line of induction, that is, energy The utilization efficiency of, thereby improving the interaction force between the permanent magnet 21 and the coil 31, that is, the vibration force of the product.

In order to install the FPC board 33 more conveniently and stably, the lower casing 12 is provided with a third tank 123 for accommodating the FPC board 33, and the FPC board 33 is usually glued and fixed on the bottom surface of the third tank 123. Further, during the product assembly process, the lower casing 12 needs to be positioned on a certain jig, and then other parts are assembled. The bottom surface of the third tank 123 is also provided with a positioning through hole 124 on the FPC board 33 The coil 31 and the housing 32 are usually hollow cylindrical, and the inner hole of the coil 31 corresponds to the positioning through hole 124 to form a avoidance during positioning. The through hole 124 facilitates the positioning of the lower casing 12 and the assembly of related parts, simple and convenient operation, higher precision and better stability, and improves the process yield of the product.

The bottom surface of the third groove body 123 may also be provided with a plurality of sixth groove bodies 125 that are matched with the FPC board 33. Usually, the plurality of sixth groove bodies 125 are interlaced with each other in a net shape, so that after the glue is applied, the FPC board 33 is convenient Glue on the lower casing 12 more firmly.

The FPC board 33 usually has a connecting portion 331 extending out of the casing 1 to facilitate connection with an external circuit. The lower casing 12 is provided with a first notch 126 for the connection portion 331 to pass through and a support for matching with the connecting portion 331. The upper casing 11 is provided with a seventh slot body 113 for the support portion 127 and the connecting portion 331 to pass through, which facilitates the connection of the motor with the external circuit, and has a more compact and stable structure. The FPC board 33 may also be provided with a slot body matching the lead of the coil 31, which not only has a more compact structure to reduce the occupied space of related parts, but also has a protective effect on the lead of the coil 31, which is safer and more reliable.

The mover assembly 2 is elastically connected to the upper housing 11 and the lower housing 12 through springs 4, that is, the spring 4 suspends the mover assembly 2 in the housing 1. Usually the lower end of the upper housing 11 and the outer edge of the spring 4 The lower end of the lower casing 12 and the lower casing 12 are pressed and connected in sequence. During the vibration of the mover assembly 2, the spring 4 not only has the function of buffering and protection, but also can provide a certain restoring force for the vibration of the mover assembly 2. The spring 4 can be a conical spring, a tower spring, a plane spring or other suitable elastic parts. A plane spring usually refers to a spring leaf that undergoes vertical elastic deformation in a plane. For example, an elastic material is rolled on a plane. The elastic material is hollowed out or the elastic material is punched and cut, etc. The flat spring structure is more compact, which can reduce the volume of the product.

The lower casing 12 is formed with a first flange 121 that cooperates with the spring 4 and the upper casing 11. The upper casing 11 and/or the spring 4 is pressed and connected to the first flange 121, which makes the operation more convenient. The structure is more stable and reliable.

The first flange 121 is provided with a plurality of first grooves 122. The first grooves 122 are usually located at the outer edge of the first flange 121 and are evenly distributed along the circumferential direction of the first flange 121. According to specific conditions, The first groove body 122 may be one, two or more. The spring 4 is provided with a second groove body 41 corresponding to the first groove body 122. The second groove body 41 is usually located on the outer edge of the spring 4, The casing 11 is provided with an inserting portion 111 corresponding to the first tank body 122 and the second tank body 41. When assembling, the inserting portion 111 is inserted into the first tank body 122 and the second tank body 41, so that you can get on the machine. The connection of the casing 11, the spring 4 and the lower casing 12 is tighter, the structure is more compact, and the structure is more stable and reliable. Further, the thickness of the inserting portion 111 is less than the thickness of the upper casing 11, so that a pressing surface 112 is formed at the intersection of the inserting portion 111 and the upper casing 11. The pressing surface 112 can make the upper casing 11 better. The ground is matched with the spring 4 or the first flange 121 for better stability.

The mover assembly 2 includes a mass 22 connected with the spring 4. The mass 22 is also called a balance block, a vibrating block, a counterweight, etc. During the vibration process, the mass 22 can increase the vibration force of the mover assembly 2 through its own inertia. The permanent magnet 21 is arranged at the end of the mass 22 close to the coil 31, and the permanent magnet 21 and the mass 22 can be connected by glue or welding.

The end of the mass 22 close to the coil 31 is provided with a yoke 23 that is matched with the permanent magnet 21 and a first hole 221 for arranging the yoke 23. The yoke 23 is provided with a slot for arranging the permanent magnet 21 and facing the coil 31. The fourth slot body 231, the yoke 23 is placed in the first hole body 221 and the permanent magnet 21 is placed in the fourth slot body 231, the connection is closer and firmer, the structure is more compact and stable, the yoke 23 is usually not produced by itself Magnetic field (magnetic line of induction), a soft magnetic material that only transmits magnetic line of induction in the magnetic circuit. The yoke 23 can usually be made of soft iron with high permeability, A3 steel, soft magnetic alloy, ferrite material, stainless steel or It is made of silicon steel and so on. It is evenly and symmetrically faceted around the induction coil. Its function is to restrict the induction coil's magnetic leakage from spreading out, improve the efficiency of induction and add, thereby improving the utilization efficiency of magnetic induction, that is, the utilization of energy. effectiveness.

The notch of the fourth groove body 231 is also provided with a second flange side 232, and one end of the first hole body 221 is provided with a fifth groove body 222 that is matched with the second flange side 232, so that the connection is closer and the structure More compact, more stable and reliable. In addition, the spring 4 can also be connected to the mass 22 and the second flange 232 respectively, so that the connection is tighter and firmer.

The coil 31 has a hollow cylindrical shape. The diameter of the permanent magnet 21 is smaller than the inner diameter of the coil 31 and one end is located in the coil 31. When in use, the permanent magnet 21 can move along the axial direction of the coil 31 to vibrate the mover assembly 2. The structure is more compact, stable, safer and more reliable. Further, the diameter of the fourth groove body 231 is greater than the outer diameter of the housing 32, the diameter of the pole piece 24 is equal to or slightly smaller than the diameter of the permanent magnet 21, and the upper end of the housing 32 and the upper end of the coil 31 may be located in the first In the four-slot body 231, the lower end of the pole piece 24 and the permanent magnet 21 can be located in the coil 31, and the coil 31 is coaxial with the permanent magnet 21. The pole piece 24 and the permanent magnet 21 move along the axial direction of the coil 31, so that the mover The component 2 vibrates in the vertical direction, the utilization efficiency of the magnetic induction line is higher, the energy utilization efficiency is improved, the vibration effect is better, the structure is more compact and stable, and the volume of the product is further reduced.

Under the same conditions, eliminate the relevant external interference factors, and compare the vibration force of different products (ie the relative force between the coil 31 and the permanent magnet 21): the maximum vibration force of the product without the housing 32 outside the coil 31 is 29.955/mN, The maximum vibration force of the present disclosure is 86.9/mN. It can be seen from this that the present disclosure greatly improves the vibration force of the product.

The above are only some embodiments of the present disclosure, which are only used to illustrate the technical solutions of the present disclosure, but not to limit it. It should be understood that, for those of ordinary skill in the art, without departing from the creative concept of the present disclosure Under the premise of, it can also be improved or replaced according to the above description, and all these improvements and replacements should belong to the protection scope of the appended claims of the present disclosure. In this case, all details can be replaced with equivalent elements, and materials, shapes and sizes can also be arbitrary.

Claims

A linear motor with a coil outer nested shell, which is characterized by comprising a casing (1) in which a mover assembly (2) and corresponding to the mover assembly (2) are arranged A matched stator assembly (3), the stator assembly (3) includes a coil (31) and an FPC board (33) for connecting the coil (31) with an external circuit, and the coil (31) is embedded with A housing (32), the mover assembly (2) has a permanent magnet (21) corresponding to the coil (31).
The linear motor with an outer coil nested housing according to claim 1, wherein the housing (32) is made of a magnetically conductive material.
The linear motor with a coil outer nested shell according to claim 1, wherein the coil (31) is hollow cylindrical, and the diameter of the permanent magnet (21) is smaller than that of the coil (31). The inner diameter and one end of it are located in the coil (31), and the permanent magnet (21) can move along the axial direction of the coil (31) to make the mover assembly (2) vibrate.
The linear motor with a coil outer nested shell according to claim 1, wherein a pole piece (24) is provided at one end of the permanent magnet (21) close to the coil (31).
The linear motor with a coil outer nested housing according to any one of claims 1 to 4, wherein the housing (1) comprises an upper housing (11) and a lower housing (12) , The stator assembly (3) is arranged on the lower casing (12).
The linear motor with a coil outer nested housing according to claim 5, wherein the lower housing (12) is provided with a third groove body (123) for accommodating the FPC board (33) .
The linear motor with a coil outer nested shell according to claim 6, wherein the bottom surface of the third groove body (123) is provided with a positioning through hole (124).
The linear motor with a coil outer nested shell according to claim 5, wherein the mover assembly (2) is connected to the upper casing (11) and the lower motor through a spring (4). The shell (12) is elastically connected.
The linear motor with a coil outer nested shell according to claim 8, characterized in that, the lower housing (12) is formed with the spring (4) and the upper housing (11). The mating first flange edge (121).
The linear motor with a coil outer nested shell according to claim 8, wherein the mover assembly (2) comprises a mass (22) connected to the spring (4), and the mass (22) A yoke (23) matched with the permanent magnet (21) is provided at one end close to the coil (31).