Linear motor

Abstract

The present invention provides a linear motor, comprising a housing provided with an accommodating cavity, and a vibrator assembly and a stator assembly accommodated in the accommodating cavity, wherein the stator assembly comprises a guide member fixed in the housing and supporting the vibrator assembly, and a coil unit driving the vibrator assembly to reciprocatingly vibrate in a first direction; the vibrator assembly comprises a steel magnet assembly arranged in the first direction; the steel magnet assembly comprises at least two steel magnets arranged in the first direction, each steel magnet is magnetized in the first direction and magnetization directions of two adjacent steel magnets are opposite; the stator assembly further comprises an auxiliary steel magnet assembly arranged at adjacent end portions of two adjacent steel magnets; the auxiliary steel magnet assembly is magnetized in a second direction perpendicular to the first direction and forms magnetic repulsive forces with the corresponding two steel magnets respectively, thereby providing a restoring force for the vibrator assembly. In the present invention, a magnetic spring forming a magnetic repulsive force between steel magnets is provided to replace a conventional spring, thereby improving the vibration performance and reliability of the linear motor.

Description

linear motor Technical Field

[0001] This invention relates to the field of motors, and more specifically to a linear motor. Background Technology

[0002] With the development of science and technology and the progress of society, portable electronic products, such as mobile phones, handheld game consoles, navigation devices, or handheld multimedia entertainment devices, are widely used in people's daily lives. In some usage scenarios of these electronic products, such as incoming call notifications, message notifications, navigation prompts, and vibration feedback of game consoles, linear motors are generally used.

[0003] Existing linear motors use springs to connect oscillators to form a vibration system. However, springs experience deformation stress during movement, and the greater the stroke, the greater the stress. When the spring material reaches its lifespan limit, the spring will break, leading to the failure of the vibration system.

[0004] Therefore, it is necessary to provide a linear motor that does not suffer from the deformation stress problem of traditional spring materials. Technical issues

[0005] The purpose of this invention is to provide a linear motor that solves the technical problem of short lifespan of linear motors caused by deformation stress in springs in the prior art. Technical solutions

[0006] The technical solution of the present invention is as follows:

[0007] The present invention provides a linear motor, comprising a housing having a receiving cavity, an oscillator assembly and a stator assembly housed within the receiving cavity, the stator assembly including a guide fixed to the housing and supporting the oscillator assembly, and a coil unit for driving the oscillator assembly to reciprocate along a first direction, the oscillator assembly including a magnet assembly disposed along the first direction, the magnet assembly including at least two magnets arranged along the first direction, each magnet being magnetized along the first direction and adjacent magnets having opposite magnetization directions; the stator assembly further includes an auxiliary magnet assembly disposed at adjacent ends of the two adjacent magnets, the auxiliary magnet assembly being magnetized along a second direction perpendicular to the first direction and forming magnetic repulsion with the corresponding two magnets respectively.

[0008] Preferably, the auxiliary magnet assembly includes a pair of auxiliary magnets disposed on two opposite sides of the oscillator assembly and magnetized along the second direction, the pair of auxiliary magnets forming a magnetic repulsion force with the corresponding two magnets; or the auxiliary magnet assembly includes two pairs of auxiliary magnets disposed on two opposite sides of the oscillator assembly and magnetized along the second direction, the two pairs of auxiliary magnets forming a magnetic repulsion force with the corresponding two magnets; or the auxiliary magnet assembly is a ring magnet, the second direction being the radial direction of the ring magnet, the ring magnet forming a magnetic repulsion force with the corresponding two magnets.

[0009] Preferably, the coil unit is arranged around the adjacent ends of two adjacent magnets, and the coil unit is provided at least one and is arranged on one side or opposite sides of the auxiliary magnet assembly along the first direction.

[0010] Preferably, the guide includes two guide sleeves disposed at opposite ends of the oscillator assembly along the first direction, each guide sleeve having a guide channel extending therethrough, the oscillator assembly being received in the guide channel and slidably connected to the guide sleeve.

[0011] Preferably, the oscillator assembly further includes a clamping plate sleeved inside the guide sleeve and having a cavity, the magnet assembly is fixed to the clamping plate and housed in the cavity, and the clamping plate is slidably connected to the guide sleeve.

[0012] Preferably, the guide sleeve is further provided with a clearance groove to avoid the edge of the clamping plate.

[0013] Preferably, the vibrator assembly further includes counterweights fixed to the clamping plate and disposed at opposite ends of the magnet assembly. The counterweights include a first part disposed outside the cavity and a second part housed inside the cavity. The first part does not contact the guide sleeve, and the clamping plate abuts against the first part. The surface of the second part connected to the clamping plate is also provided with a groove, and the groove engages with a protrusion on the clamping plate.

[0014] Preferably, the magnet assembly further includes soft magnets spaced apart along the first direction, the number of soft magnets being one less than the number of magnets, and the soft magnets being disposed between two adjacent magnets.

[0015] Preferably, the soft magnet includes a first soft magnet corresponding to the auxiliary magnet assembly and a second soft magnet corresponding to the coil unit. The first soft magnet is disposed opposite to the auxiliary magnet assembly at a distance, and the second soft magnet is disposed opposite to the coil unit at a distance.

[0016] Preferably, the soft magnet is made of a soft magnetic material, which includes at least one of carbon steel, iron-cobalt alloys, amorphous alloys, and nanocrystalline alloys. Beneficial effects

[0017] The beneficial effects of the present invention are as follows: The oscillator assembly of the present invention includes a housing with a receiving cavity, an oscillator assembly housed in the receiving cavity, and a stator assembly. The stator assembly includes a guide fixed to the housing and supporting the oscillator assembly, and a coil unit for driving the oscillator assembly to reciprocate along a first direction. The oscillator assembly includes a magnet assembly arranged along the first direction, the magnet assembly including at least two magnets arranged along the first direction, each magnet being magnetized along the first direction and the magnetization directions of adjacent magnets being opposite. The stator assembly includes an auxiliary magnet assembly disposed at adjacent ends of two adjacent magnets, the auxiliary magnet assembly being arranged vertically... The first direction is magnetized in the second direction, and magnetic repulsion is formed with the corresponding two magnets respectively. In the above structure, an auxiliary magnet assembly and a magnetic spring composed of two parallel magnets with opposite magnetization directions are provided. The magnetic repulsion between the auxiliary magnet assembly and the magnets provides an effective restoring force for the oscillator assembly, ensuring that the oscillator assembly can reciprocate along the first direction. This not only solves the deformation stress problem of traditional spring materials and improves the service life of linear motors, but also ensures that the auxiliary magnet assembly does not occupy the design size in the first direction, allowing the oscillator assembly to have a larger stroke and greater vibration, and improving vibration performance and reliability. Attached Figure Description

[0018] Figure 1 is a three-dimensional structural diagram of the linear motor provided by the present invention;

[0019] Figure 2 is a cross-sectional view along line AA in Figure 1;

[0020] Figure 3 is an exploded three-dimensional view of the linear motor provided by the present invention;

[0021] Figure 4 is an exploded three-dimensional view of the oscillator assembly in the linear motor provided by the present invention;

[0022] Figure 5 is a perspective view of the first linear motor provided by the present invention after removing the top cover plate;

[0023] Figure 6 is a perspective view of the second linear motor provided by the present invention after removing the top cover plate;

[0024] Figure 7 is a perspective view of the third linear motor provided by the present invention after removing the top cover plate;

[0025] Figure 8 is a cross-sectional view along line BB in Figure 1;

[0026] In the figure: linear motor 100, housing 10, upper cover plate 11, lower cover plate 12, receiving cavity 13, vibrator assembly 20, magnet assembly 21, magnet 211, soft magnet 22, first soft magnet 221, second soft magnet 222, clamping plate 23, cavity 231, protrusion 232, upper clamping plate 233, lower clamping plate 234, counterweight 24, first part 241, second part 242, groove 2421, stator assembly 30, auxiliary magnet assembly 31, auxiliary magnet 311, coil unit 32, guide 33, guide sleeve 331, clearance groove 332, first direction X, second direction Z. Embodiments of the present invention

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0028] Please refer to Figures 1-8. The present invention provides a linear motor 100, including a housing 10 having a receiving cavity 13, an oscillator assembly 20 and a stator assembly 30 housed in the receiving cavity 13. The housing 10 includes an upper cover plate 11 and a lower cover plate 12 forming the receiving cavity with the upper cover plate 11. The stator assembly 30 includes a guide member 33 fixed to the housing 10 and supporting the oscillator assembly 20, and a coil unit 32 for driving the oscillator assembly 20 to reciprocate along a first direction X. The oscillator assembly 20 includes a magnet assembly 21 arranged along the first direction X. The magnet assembly 21 includes at least two magnets 211 arranged along the first direction X. Each magnet 211 is magnetized along the first direction X and the magnetization directions of two adjacent magnets 211 are opposite.

[0029] Specifically, referring to Figures 2 and 3, the stator assembly 30 also includes auxiliary magnet assemblies 31 disposed at adjacent ends of two adjacent magnets 211. The auxiliary magnet assemblies 31 are magnetized along a second direction Z perpendicular to the first direction X and form magnetic repulsion with the corresponding two magnets 211, thereby providing an effective restoring force for the oscillator assembly 20 and ensuring that the oscillator assembly 20 can reciprocate along the first direction X. The auxiliary magnet assembly 31 and the corresponding two magnets 211 cooperate to form a magnetic spring system, replacing the traditional motor spring. This not only solves the problems of large deformation stress and spring breakage during the movement of traditional motor springs, improving the service life of the linear motor 100, but also allows the linear motor 100 to have a larger stroke and greater vibration, improving vibration performance and reliability.

[0030] Further, referring to Figures 5-7, the auxiliary magnet assembly 31 includes a pair of auxiliary magnets 311 disposed on one opposite side of the oscillator assembly 20 and magnetized along the second direction Z, the pair of auxiliary magnets 311 forming a magnetic repulsion force with the corresponding two magnets 211; or the auxiliary magnet assembly 31 includes two pairs of auxiliary magnets 311 disposed on two opposite sides of the oscillator assembly 20 and magnetized along the second direction Z, the two pairs of auxiliary magnets 311 forming a magnetic repulsion force with the corresponding two magnets 211; or the auxiliary magnet assembly 31 is an annular magnet, the second direction being the radial direction of the annular magnet, the annular magnet forming a magnetic repulsion force with the corresponding two magnets 211.

[0031] Please refer to Figures 2 and 5. The auxiliary magnet assembly 31 provided by the present invention can be a pair of auxiliary magnets 311 located on opposite upper and lower sides of the oscillator assembly 20. Both auxiliary magnets 311 are magnetized along the vertical direction of the oscillator assembly 20 and the magnetization directions of the two auxiliary magnets 311 are opposite. At this time, the vertical direction of the oscillator assembly 20 is the second direction Z. The two auxiliary magnets 311 form a magnetic repulsion with the corresponding magnet 211. The two auxiliary magnets 311 are symmetrically arranged on both sides of the magnet 211, so that the magnet 211 is subjected to more balanced and stable forces, which further improves the stability of the linear motor 100.

[0032] Referring to Figure 6, the auxiliary magnet assembly 31 provided by the present invention can be a pair of auxiliary magnets 311 located on opposite sides of the front and rear of the oscillator assembly 20. Both auxiliary magnets 311 are magnetized along the front and rear direction of the oscillator assembly 20 and the magnetization directions of the two auxiliary magnets 311 are opposite. At this time, the front and rear direction of the oscillator assembly 20 is the second direction Z. The two auxiliary magnets 311 form a magnetic repulsion with the corresponding magnet 211. The two auxiliary magnets 311 are symmetrically arranged on both sides of the magnet 211, so that the magnet 211 is subjected to more balanced and stable forces, which further improves the stability of the linear motor 100.

[0033] Referring to Figures 2 and 7, the auxiliary magnet assembly 31 provided by the present invention can be two pairs of auxiliary magnets 311 located on the upper and lower sides and the front and rear sides of the oscillator assembly 20. The two pairs of auxiliary magnets 311 are magnetized along the upper and lower directions and the front and rear directions of the oscillator assembly 20, respectively, and the magnetization directions of each pair of auxiliary magnets 311 are opposite. At this time, the upper and lower directions and the front and rear directions of the oscillator assembly 20 are both perpendicular to the vibration direction of the oscillator assembly 20, that is, the upper and lower directions and the front and rear directions of the oscillator assembly 20 are both the second direction Z. The four auxiliary magnets 311 form a magnetic repulsion force with the corresponding magnets 211. The four auxiliary magnets 311 are symmetrically arranged around the upper and lower and front and rear of the magnets 211, making the magnets 211 more balanced and stable under force, further improving the stability of the linear motor 100. Alternatively, the auxiliary magnet assembly 31 can be an annular magnet surrounding the oscillator assembly 20. The annular magnet is magnetized radially and forms a magnetic repulsion force with the corresponding magnets 211, and the second direction Z is the radial direction of the annular magnet.

[0034] Please refer to Figures 2-7. The coil unit 32 is arranged around the adjacent ends of two adjacent magnets 211, which can maximize the use of the magnetic field and generate a greater driving force. The coil unit 32 is provided at least one and is arranged on one side or opposite sides of the auxiliary magnet assembly 31 along the first direction X. After being energized, the coil unit 32 generates a driving force in the magnetic field, thereby driving the oscillator assembly 20 to vibrate along the first direction X. The magnetic repulsion between the auxiliary magnet assembly 31 and the corresponding magnet 211 provides a restoring force for the oscillator assembly 20, so that the oscillator assembly 20 reciprocates along the first direction X.

[0035] Further, referring to Figures 5-7, the guide member 33 includes two guide sleeves 331 disposed at opposite ends of the oscillator assembly 20 along the first direction X. Each guide sleeve 331 has a through-channel, and the oscillator assembly 20 is housed within the through-channel and slidably connected to the guide sleeve 331. The two guide sleeves 331 are symmetrically disposed on both sides of the coil unit 32 along the first direction X, and this arrangement does not increase the size of the linear motor 100. Depending on the actual situation, the guide member 33 can also be other guiding devices, such as guide rods, slide rails, or other structures that can support the oscillator assembly 20; these are all within the scope of protection of this invention. The guide sleeves 331 can be made of wear-resistant materials such as plastic or alloy, or other wear-resistant materials.

[0036] Furthermore, referring to Figures 2-7, the oscillator assembly 20 also includes a clamping plate 23 sleeved within the guide sleeve 331 and having a cavity 231. The magnet assembly 21 is fixed to the clamping plate 23 and housed within the cavity 231. The clamping plate 23 is slidably connected to the guide sleeve 331. The clamping plate 23 includes an upper clamping plate 233 and a lower clamping plate 234 disposed opposite to the upper clamping plate 233. The upper clamping plate 233 and the lower clamping plate 234 together enclose the cavity 231. The clamping plate 23 is responsible for frictional contact with the guide sleeve 331, protecting the magnet assembly 21 and further improving the service life of the linear motor 100. It should be noted that the clamping plate 23 can be made of a non-magnetic material, and the clamping plate 23 can be integral or, as shown in this embodiment, formed by the upper clamping plate 233 and the lower clamping plate 234.

[0037] To reduce friction between the clamping plate 23 and the guide sleeve 331, as shown in Figures 3 and 8, the guide sleeve 331 is also provided with a relief groove 332 to avoid the edge of the clamping plate 23. The edges of the upper clamping plate 233 and the lower clamping plate 234 may have burrs, and the weld surfaces of the upper clamping plate 233 and the lower clamping plate 234 may be rough and uneven during welding. The relief groove 332 can prevent these burrs and rough surfaces from increasing the sliding friction between the oscillator assembly 20 and the guide sleeve 331, thereby affecting the vibration effect of the linear motor 100.

[0038] Please refer to Figures 2-8. The oscillator assembly 20 also includes counterweights 24 fixed to the clamping plate 23 and disposed at opposite ends of the magnet assembly 21. The counterweights 24 can provide greater weight to the oscillator assembly 20, increasing the vibration of the linear motor 100. The counterweights 24 include a first part 241 disposed outside the cavity 231 and a second part 242 housed within the cavity 231. The first part 241 does not contact the guide sleeve 331, and the clamping plate 23 abuts against the first part 241. The surface of the second part 242 that connects with the clamping plate 23 is also provided with a groove 2421, which engages with the protrusion 232 on the clamping plate 23.

[0039] Furthermore, referring to Figures 2 and 3, the magnet assembly 21 also includes soft magnets 22 spaced apart along the first direction X. The number of soft magnets 22 is one less than the number of magnets 211, and the soft magnets 22 are respectively disposed between two adjacent magnets 211. The placement of the soft magnets 22 between two adjacent magnets 211 can enhance the magnetic field, thereby increasing the vibration performance of the linear motor 100.

[0040] The soft magnet 22 includes a first soft magnet 221 corresponding to the auxiliary magnet assembly 31 and a second soft magnet 222 corresponding to the coil unit 32. The first soft magnet 221 is arranged opposite to the auxiliary magnet assembly 31 at a distance, and the second soft magnet 222 is arranged opposite to the coil unit 32 at a distance.

[0041] It is understood that the soft magnet 22 is made of a soft magnetic material. As an example, the soft magnetic material can be carbon steel, or it can be an iron-cobalt alloy, or it can be an amorphous alloy, or it can be a nanocrystalline alloy, or it can be other soft magnetic materials.

[0042] It should be noted that the auxiliary magnet assembly 31 and magnet assembly 21 are made of permanent magnet materials, which have strong magnetic properties, good stability, long service life, and high energy efficiency. The permanent magnet material can be neodymium iron boron (NdFeB). It is understood that other permanent magnet materials can also be used, which will not be elaborated upon here.

[0043] Specifically, the magnet assembly 21 is magnetized as a single unit, meaning that magnetization is performed at different locations on a single piece of soft magnetic material to form magnets 211. This simplifies the assembly process and improves production efficiency. Alternatively, the magnet assembly 21 can be magnetized separately, with each magnet 211 magnetized individually and then glued together with the soft magnet 22. This method offers high flexibility and facilitates maintenance and parts replacement.

[0044] It is understandable that the number and size of the magnet assembly 21 and the coil unit 32 can be determined according to the size of the linear motor 100, and the number and size of the magnet assembly 21 and the coil unit 32 can be increased or decreased according to specific circumstances.

[0045] Compared with related technologies, the present invention sets up an auxiliary magnet assembly and a magnetic spring composed of two parallel magnets with opposite magnetization directions. The magnetic repulsion between the auxiliary magnet assembly and the magnets provides an effective restoring force for the oscillator assembly, ensuring that the oscillator assembly can reciprocate along the first direction. This not only solves the deformation stress problem of traditional spring materials and improves the service life of linear motors, but also ensures that the auxiliary magnet assembly does not occupy the design dimensions in the first direction, allowing the oscillator assembly to have a larger stroke and greater vibration, and improving vibration performance and reliability.

[0046] The above are merely embodiments of the present invention. It should be noted that those skilled in the art can make improvements without departing from the inventive concept of the present invention, but these improvements all fall within the protection scope of the present invention.

Claims

1. A linear motor comprising a housing having a receiving cavity, an oscillator assembly and a stator assembly housed within the receiving cavity, the stator assembly including a guide fixed to the housing and supporting the oscillator assembly, and a coil unit for driving the oscillator assembly to reciprocate along a first direction, the oscillator assembly including a magnet assembly disposed along the first direction, the magnet assembly including at least two magnets arranged along the first direction, each magnet being magnetized along the first direction and adjacent magnets having opposite magnetization directions, characterized in that... The stator assembly further includes auxiliary magnet assemblies disposed at adjacent ends of two adjacent magnets, the auxiliary magnet assemblies being magnetized along a second direction perpendicular to the first direction and forming magnetic repulsion with the corresponding two magnets respectively.

2. The linear motor according to claim 1, characterized in that, The auxiliary magnet assembly includes a pair of auxiliary magnets disposed on one opposite side of the oscillator assembly and magnetized along the second direction, wherein the pair of auxiliary magnets forms a magnetic repulsion force with the corresponding two magnets; or the auxiliary magnet assembly includes two pairs of auxiliary magnets disposed on two opposite sides of the oscillator assembly and magnetized along the second direction, wherein the two pairs of auxiliary magnets form a magnetic repulsion force with the corresponding two magnets; or the auxiliary magnet assembly is a ring magnet, wherein the second direction is the radial direction of the ring magnet, and the ring magnet forms a magnetic repulsion force with the corresponding two magnets.

3. The linear motor according to claim 1, characterized in that, The coil unit is arranged around the adjacent ends of two adjacent magnets, and the coil unit is provided at least one and is arranged on one side or opposite sides of the auxiliary magnet assembly along the first direction.

4. The linear motor according to claim 1, characterized in that, The guide includes two guide sleeves disposed at opposite ends of the oscillator assembly along the first direction. Each guide sleeve has a guide channel extending through it, and the oscillator assembly is housed in the guide channel and slidably connected to the guide sleeve.

5. The linear motor according to claim 4, characterized in that, The oscillator assembly further includes a clamping plate sleeved inside the guide sleeve and having a cavity. The magnet assembly is fixed to the clamping plate and housed in the cavity. The clamping plate is slidably connected to the guide sleeve.

6. The linear motor according to claim 5, characterized in that, The guide sleeve is also provided with a clearance groove to avoid the edge of the clamping plate.

7. The linear motor according to claim 5, characterized in that, The vibrator assembly also includes counterweights fixed to the clamping plate and disposed at opposite ends of the magnet assembly. The counterweights include a first part disposed outside the cavity and a second part housed inside the cavity. The first part does not contact the guide sleeve, and the clamping plate abuts against the first part. The surface of the second part connected to the clamping plate is also provided with a groove, and the groove engages with a protrusion on the clamping plate.

8. The linear motor according to claim 3, characterized in that, The magnet assembly further includes soft magnets arranged at intervals along the first direction, wherein the number of soft magnets is one less than the number of magnets and the soft magnets are respectively disposed between two adjacent magnets.

9. The linear motor according to claim 8, characterized in that, The soft magnet includes a first soft magnet corresponding to the auxiliary magnet assembly and a second soft magnet corresponding to the coil unit. The first soft magnet is positioned opposite the auxiliary magnet assembly at a distance, and the second soft magnet is positioned opposite the coil unit at a distance.

10. The linear motor according to claim 8, characterized in that, The soft magnet is made of a soft magnetic material, which includes at least one of carbon steel, iron-cobalt alloys, amorphous alloys, and nanocrystalline alloys.

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