CN219181387U - Variable frequency resonant actuator and electronic device - Google Patents

Abstract

The utility model discloses a variable-frequency resonance actuator and electronic equipment, which comprises a base body, an elastic piece and a heating power supply, wherein at least one stator and at least one rotor which is matched with the stator are arranged in the base body, one of the stator and the rotor comprises an electromagnet for generating a magnetic field with the direction changing alternately, the other of the stator and the rotor comprises a permanent magnet, and the rotor can reciprocate relative to the stator under the cooperation of the electromagnet and the permanent magnet; the free end of the elastic piece is respectively connected with the rotor and the matrix and is used for providing elastic restoring force for the rotor to reset, and the elastic piece is made of a memory alloy material; the heating power supply is electrically connected with the elastic piece and is used for providing different-intensity currents for the elastic piece so as to change the elastic coefficient of the elastic piece. The resonant actuator with the structure can dynamically change the resonant frequency, so that the resonant actuator reaches the maximum vibration intensity at a plurality of frequency points to generate vibrations with different resonant frequencies.

Description

Variable frequency resonant actuator and electronic device

Technical Field

The present utility model relates to the field of linear actuators, and in particular, to a variable frequency resonant actuator and an electronic device.

Background

Some commonly used electronic devices, such as mobile phones and hand rings, are provided with a vibration motor composed of a resonant actuator to provide high-frequency vibration as a prompt signal for the electronic device. For a linear resonant actuator whose basic structure includes a movable portion and an elastic portion, the linear resonant actuator can generate maximum vibration intensity when the vibration frequency of the movable portion reaches or approaches the resonance (resonance) frequency, according to the resonance frequency f of the linear resonant actuator described below ₀ Is calculated according to the formula:

it can be seen that. When the linear resonant actuator is manufactured, the value of k (elastic coefficient of the elastic portion) and the value of m (mass of the movable portion) are fixed, so that the resonant frequency f of the linear resonant actuator is generally the same ₀ Is a fixed value. Conventionally, when the linear resonant actuator driving frequency is at or near the resonant frequency, the linear resonant actuator may generate strong vibration, the driving frequency continues to deviate from the resonant frequency, and the vibration intensity of the linear resonant actuator rapidly becomes weak. That is, the vibration intensity of the linear resonant actuator has a steeper peak along with the change curve of the vibration frequency, so that a small deviation from the resonance frequency causes a significant decrease in the vibration intensity, resulting in a smaller operating frequency range of the linear resonant actuator. In some cases where a broadband operation mode of the linear resonant actuator is required, the operating frequency range can be enlarged only by simply increasing the mass of the linear resonant actuator, but the increase in the mass of the linear resonant actuator necessarily requires an increase in the number of turns of the coil, which results in an increase in the size of the linear resonant actuator, but for electronic devices with severe size and power consumption requirements, the simple increase in the mass of the linear resonant actuator cannot meet the requirement of miniaturization of the electronic devices. Moreover, even if the operating frequency range is enlarged by increasing the size of the linear resonant actuator, there is only one resonant frequency.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the present utility model proposes a variable frequency resonant actuator whose resonant frequency is variable without changing the size of the resonant actuator to provide a plurality of resonant frequencies.

The utility model also provides an electronic device of the variable frequency resonant actuator.

According to the variable frequency resonant actuator, the embodiment of the first aspect of the utility model comprises a base body, an elastic piece and a heating power supply, wherein at least one stator and at least one rotor matched with the stator are arranged in the base body, one of the stator and the rotor comprises an electromagnet for generating a magnetic field with alternating directions, the other of the stator and the rotor comprises a permanent magnet, and the rotor can reciprocate relative to the stator under the cooperation of the electromagnet and the permanent magnet; the free end of the elastic piece is respectively connected with the rotor and the matrix and is used for providing elastic restoring force for the rotor to reset, and the elastic piece is made of a memory alloy material; the heating power supply is electrically connected with the elastic piece and is used for providing different-intensity currents for the elastic piece so as to change the elastic coefficient of the elastic piece.

The variable frequency resonant actuator according to the embodiment of the first aspect of the present utility model has at least the following advantageous effects:

be provided with the stator and with the active cell of stator looks adaptation on the base member to and elastic component and the heating power that is connected with the elastic component electricity: the free end of the elastic piece is respectively connected with the base body and the mover, one of the stator and the mover comprises an electromagnet, the other of the stator and the mover comprises a permanent magnet, the electromagnet and the permanent magnet are matched to enable the mover to reciprocate relative to the stator, the elastic piece is made of a shape memory alloy material, and the heating power supply is used for loading different-intensity currents for the elastic piece so as to change the elastic coefficient of the elastic piece; the resonant actuator with the structure can dynamically change the resonant frequency, so that the resonant actuator reaches the maximum vibration intensity at a plurality of frequency points, the purpose of expanding the working frequency of the resonant actuator on the premise of not changing the mass and the size of the resonant actuator is achieved, and a plurality of vibration modes can be output for electronic equipment provided with the actuator.

According to the variable frequency resonant actuator of some embodiments of the first aspect of the present utility model, the elastic member includes two clamping plates and an arc-shaped elastic connecting plate, two ends of the elastic connecting plate are respectively connected with one clamping plate, one end of the other clamping plate, which is away from the elastic connecting plate, is connected with the mover, and one end of the other clamping plate, which is away from the elastic connecting plate, is connected with the base body.

According to some embodiments of the first aspect of the present utility model, the elastic member further includes a heating member, and the heating member is disposed on the clamping plate and electrically connected to the heating power supply.

According to some embodiments of the first aspect of the present utility model, the variable frequency resonant actuator further comprises an elastic buffer member, wherein the elastic buffer member is disposed at an end of the clamping plate facing away from the elastic connecting plate, and is located between the two clamping plates.

According to the variable frequency resonant actuator of some embodiments of the first aspect of the present utility model, the elastic buffer is further disposed on the mover and located at one side of the elastic connection plate.

According to some embodiments of the first aspect of the present utility model, the variable frequency resonant actuator further comprises an elastic support auxiliary member, the elastic member is a spring, two ends of the spring are respectively connected with the mover and the substrate, and the elastic support auxiliary member is located at one side of the elastic member and is respectively connected with the mover and the substrate.

According to the variable frequency resonant actuator of some embodiments of the first aspect of the present utility model, a cavity is provided on the base body, the stator and the mover are both accommodated in the cavity, the mover further comprises a movable block, and two ends of the movable block are respectively connected with an elastic member and are spaced from the side wall of the base body.

According to the variable frequency resonant actuator of some embodiments of the first aspect of the present utility model, the movable block is provided with a containing groove with a notch facing the bottom wall of the base body, one of the permanent magnet and the electromagnet is contained in the containing groove, and the other of the permanent magnet and the electromagnet is arranged on the inner wall of the base body and is opposite to the notch of the containing groove.

An electronic device according to some embodiments of the second aspect of the present utility model includes a device body and a variable frequency resonant actuator according to the embodiments of the first aspect provided on the device body.

The electronic device according to some embodiments of the second aspect of the present utility model has at least the following advantages:

by applying the variable frequency resonant actuator of the embodiment of the first aspect described above to an electronic device, the electronic device can output a plurality of vibration modes.

According to the electronic device of some embodiments of the second aspect of the present utility model, a current controller electrically connected to the heating power supply is disposed in the device body, and the current controller is used for controlling the current intensity loaded on the elastic member to be at different levels, so that the variable frequency resonant actuator can provide vibrations with different resonant frequencies for the electronic device.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic diagram of a vibration actuator (without upper cover) according to an embodiment of the present utility model;

FIG. 2 is a schematic view of a vibration actuator (without upper cover) according to another embodiment of the present utility model;

FIG. 3 is an exploded view of a vibration actuator according to an embodiment of the present utility model;

FIG. 4 is a schematic view of the vibration actuator removal frame of FIG. 1;

fig. 5 is a schematic view of the internal structure of the vibration actuator in fig. 1.

Reference numerals:

a base 100; a base plate 110; a cover plate 120; a frame 130;

a mover 200; a movable block 210; a receiving groove 211; a permanent magnet 220; an electromagnet 230;

an elastic member 300; a clamping plate 310; an elastic connection plate 320; a heating member 313;

an elastic buffer 400;

the supporting auxiliary member 500.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

In the description of the present utility model, it should be understood that the direction or positional relationship indicated with respect to the description of the orientation, such as up, down, left, right, front, rear, etc., is based on the direction or positional relationship shown in the drawings, is merely for convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the apparatus or element to be referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, the description of the first and second is only for the purpose of distinguishing technical features, and should not be construed as indicating or implying relative importance or implying the number of technical features indicated or the precedence of the technical features indicated.

In the description of the present utility model, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present utility model can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.

A variable frequency resonant actuator according to an embodiment of the first aspect of the present utility model is described below with reference to fig. 1 to 5.

Referring to fig. 1, the variable frequency resonant actuator of the present embodiment includes a base 100, an elastic member 300 and a heating power source, at least one stator and at least one mover 200 adapted to the stator are disposed in the base 100, one of the stator and the mover 200 includes an electromagnet 230 for generating a magnetic field with alternating directions, the other of the stator and the mover 200 includes a permanent magnet 220, and the mover 200 can reciprocate relative to the stator under the cooperation of the electromagnet 230 and the permanent magnet 220; the free ends of the elastic members 300 are respectively connected with the mover 200 and the substrate 100 for providing an elastic restoring force for restoring the mover 200, and the elastic members 300 are made of a memory alloy material; the heating power supply is electrically connected with the elastic member 300 and is used for providing different intensities of current for the elastic member 300 so as to change the elastic coefficient of the elastic member 300.

The base 100 is provided with a stator, a rotor 200 matched with the stator, an elastic piece 300 and a heating power supply electrically connected with the elastic piece 300: the free end of the elastic member 300 is respectively connected with the base body 100 and the mover 200, one of the stator and the mover 200 comprises an electromagnet 230, the other of the stator and the mover 200 comprises a permanent magnet 220, the electromagnet 230 and the permanent magnet 220 are matched to enable the mover 200 to reciprocate relative to the stator, the elastic member 300 is made of a shape memory alloy material, and a heating power supply is used for loading different-intensity currents for the elastic member 300 so as to change the elastic coefficient of the elastic member 300; the resonant actuator with the structure can dynamically change the resonant frequency, so that the resonant actuator reaches the maximum vibration intensity at a plurality of frequency points, the purpose of expanding the working frequency of the resonant actuator on the premise of not changing the mass and the size of the resonant actuator is achieved, and a plurality of vibration modes can be output for electronic equipment provided with the actuator.

Conventionally, a shape memory alloy is an alloy material that can completely eliminate deformation thereof occurring at a low temperature after heating up, and recover its original shape before deformation. Specifically, in the initial state, the elastic member 300 in the present embodiment is in a compressed and deformed state, and by raising the temperature of the elastic member 300, the elastic member 300 assembly can gradually recover to the original shape; that is, by controlling the temperature at which the elastic member 300 is raised, the degree of restoration of the elastic member 300 can be controlled, and at the same time, the raised temperature changes the young's modulus of the material, so that the elastic coefficient of the elastic member 300 can be controlled. The heating source is electrically connected to the elastic member 300 in this embodiment, and is used to provide different intensities of current to the elastic member 300. According to the effect of the heat of the current, the electrical energy is converted into heat energy when the current passes through the conductor. That is, the elastic member 300 may generate heat in the energized state, and the heating power source provides different intensities of current to the elastic member 300 so that the temperature of the elastic member 300 may be changed differently, so that the elastic coefficient of the elastic member 300 may be changed differently, and thus the variable frequency resonant actuator of the present embodiment may output various resonant frequencies. It is understood that, in the initial state, the elastic member 300 in the present embodiment may also be in a stretched and deformed state.

Referring to fig. 4 and 5, in detail, a stator is disposed on a base 100, a mover 200 is accommodated in the base 100, and the mover 200 is disposed opposite to and spaced apart from the stator. The elastic piece 300 has certain rigidity, the elastic piece 300 is respectively connected with the rotor 200 and the base body 100, the rotor 200 can be supported inside the base body 100, and the rotor 200 is suspended, so that the rotor 200 is not contacted with the base body 100 when moving back and forth in the base body 100, friction between the rotor 200 and the base body 100 is avoided, and the rotor 200 can move more flexibly. When the mover 200 is stressed, the mover 200 moves to one side relative to the stator, and the mover 200 presses the elastic member 300 positioned at one side while stretching the elastic member 300 positioned at the other side; when the mover 200 is not subjected to force or when the mover 200 is subjected to force in the opposite direction, the elastic member 300 is restored as it is, so that the mover 200 is reset.

Referring to fig. 1 and 2, specifically, two sets of elastic members 300, namely, a first elastic member 300 and a second elastic member 300, are provided, and the mover 200 can move in two directions with respect to the stator by providing the two sets of elastic members 300. When the mover 200 is forced, the mover 200 moves to a side close to the first elastic member 300 with respect to the substrate 100, the mover 200 presses the first elastic member 300, and the second elastic member 300 is stretched; when the mover 200 is not subjected to force or when the mover 200 is subjected to force in the opposite direction, the two sets of elastic members 300 are restored as they are, so that the mover 200 is reset. When the mover 200 continuously receives a force in the opposite direction, the mover 200 moves in the opposite direction, the second elastic member 300 is pressed, and the first elastic member 300 is stretched. Through setting up two sets of elastic component 300 for rotor 200 unsettled setting is in the center of base member 100, and elastic component 300 is more stable to the supporting role of rotor 200, thereby more stable when making rotor 200 round trip movement, and then the frequency of the vibration that makes produce is more stable.

It can be understood that the elastic member 300 includes two clamping plates 310 and an arc-shaped elastic connection plate 320, wherein two ends of the elastic connection plate 320 are respectively connected to one clamping plate 310, one clamping plate 310 is connected to the mover 200 at an end facing away from the elastic connection plate 320, and the other clamping plate 310 is connected to the base 100 at an end facing away from the elastic connection plate 320. Referring to fig. 1 and 3, in particular, when the elastic member 300 is compressed, the two clamping plates 310 are close to each other, and both ends of the arc-shaped elastic connection plate 320 are also close to each other; when the elastic member 300 is stretched, the two clamping plates 310 are separated from each other, and both ends of the arc-shaped elastic connection plate 320 are also separated from each other. Specifically, the elastic member 300 is integrally formed.

It is understood that the elastic member 300 further includes a heating member 313, and the heating member 313 is disposed on the clamping plate 310 and electrically connected to a heating power source.

Conventionally, the amount of heat generated by an energized conductor is proportional to the square of the current and proportional to the resistance of the conductor. Under the same current and the same energization period, the larger the resistance value of the elastic member 300, the higher the heat generated.

Conventionally, the resistance of a conductor is calculated as: r=ρ×l/S; where ρ is the conductor resistivity, L is the conductor length, and S is the conductor cross-sectional area. I.e., the smaller the cross-sectional area of the conductor, the smaller the resistance of the conductor, i.e., the smaller the cross-sectional area of the elastic member 300, the higher the heat generated under the same current and the same energization time. The cross-sectional areas of the clamping plate 310 and the arc-shaped elastic connection plate 320 in the present embodiment are relatively large, and thus, in particular, the heating member 313 is provided on the clamping plate 310 and/or the arc-shaped elastic connection plate 320, which helps to raise the temperature of the elastic member 300 so that the elastic member 300 is more easily restored to the original state. Of course, the heating element 313 may also be disposed on the housing, and the temperature of the heating element 313 may indirectly increase the temperature of the elastic element 300. The heating member 313 may be a heating resistance wire.

It can be appreciated that the variable frequency resonant actuator of the present embodiment further includes an elastic buffer 400, where the elastic buffer 400 is disposed at an end of the clamping plate 310 away from the elastic connection plate 320 and is located between the two clamping plates 310.

It is understood that the elastic buffer 400 is further provided on the mover 200 at one side of the elastic connection plate 320.

By providing the elastic buffer 400, the two clamping plates 310 can be prevented from being damaged when the mover 200 moves relative to the stator and collides with each other; it is also possible to avoid the substrate 100 and the mover 200, and the mover 200 and the elastic connection plate 320 from being damaged when they collide with each other, so as to improve the service life of the variable frequency resonant actuator according to the embodiment of the first aspect of the present utility model.

It can be understood that the variable frequency resonant actuator of the present embodiment further includes an elastic support auxiliary member 500, the elastic member 300 is a spring, two ends of the spring are respectively connected to the mover 200 and the substrate 100, and the elastic support auxiliary member 500 is located at one side of the elastic member 300 and is respectively connected to the mover 200 and the substrate 100. The cross-sectional area of the spring is relatively small, so that the spring can generate higher heat under the condition of the same current and the same energizing time. The springs have a certain bending capability in the lateral direction, that is, the supporting effect of the springs on the mover 200 is weak, and by adding the elastic supporting auxiliary member 500, the mover 200 can be more stably suspended in the middle of the substrate 100. Specifically, the elastic support auxiliary member 500 includes two clamping plates 310 and an arc-shaped elastic connection plate 320, wherein two ends of the elastic connection plate 320 are respectively connected to one clamping plate 310, and one ends of the two clamping plates 310 facing away from the elastic connection plate 320 are respectively connected to the base 100 and the mover 200. It will be appreciated that the resilient support aid 500 may be made of a memory metal alloy material or a more ductile material, such as a copper alloy or steel.

It can be understood that the base 100 is provided with a cavity, the stator and the mover 200 are both accommodated in the cavity, the mover 200 further includes a movable block 210, and two ends of the movable block 210 are respectively connected with an elastic member 300 and are spaced from the side wall of the base 100.

It can be understood that the movable block 210 is provided with a receiving groove 211 with a notch facing the bottom wall of the base 100, one of the permanent magnet 220 and the electromagnet 230 is received in the receiving groove 211, and the other of the permanent magnet 220 and the electromagnet 230 is disposed on the inner wall of the base 100 opposite to the notch of the receiving groove 211. Referring to fig. 1, fig. 2, fig. 3, and fig. 5, specifically, the base 100 includes a base plate 110, a cover plate 120, and a frame 130, where the base plate 110 and the cover plate 120 are respectively disposed at two openings of the frame 130, and are used for covering the mover 200, the stator, and the elastic member 300, so as to play roles of dust prevention, protection, and shielding. The elastic member 300 is connected to the inner wall of the frame 130, and the frame 130 is provided with a clamping groove for clamping a free end of the elastic member 300. It is understood that a clamping groove for clamping the other free end of the elastic member 300 may be also provided on the mover 200.

It can be understood that the mover 200 includes a permanent magnet 220, and the permanent magnet 220 is accommodated in the accommodating groove 211 of the movable block 210, and the stator is an electromagnet 230 and is disposed on the base 100. Of course, the mover 200 may also include an electromagnet 230, where the electromagnet 230 is accommodated in the accommodating groove 211, and the stator is the permanent magnet 220.

Referring to fig. 3, in particular, the mover 200 includes a permanent magnet 220, and the stator is an electromagnet 230. The accommodating groove 211 penetrates through the movable block 210, three permanent magnets 220 are arranged in parallel in the accommodating groove 211, the permanent magnets 220 are single-sided double-click magnets, and polarities of mutually adjacent magnetic pole faces of two adjacent permanent magnets 220 are different. The electromagnets 230 are provided in two groups, and are disposed on the bottom plate 110 and the cover plate 120, respectively, and are disposed opposite to the permanent magnets 220. The electromagnets 230 are ring-shaped and each electromagnet 230 spans the pole face of the permanent magnet 220, respectively.

An electronic device according to some embodiments of the second aspect of the present utility model includes a device body and a variable frequency resonant actuator according to the first aspect of the present utility model. By applying the variable frequency resonant actuator of the embodiment of the first aspect described above to an electronic device, the electronic device can output a plurality of vibration modes.

In the electronic device according to some embodiments of the second aspect of the present utility model, a current controller electrically connected to the heating power supply is disposed in the device body, and the current controller is configured to control the current intensity loaded on the elastic member 300 to be at different levels, so that the variable frequency resonant actuator can provide vibrations with different resonant frequencies for the electronic device.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A variable frequency resonant actuator comprising:

the device comprises a base body, wherein at least one stator and at least one rotor matched with the stator are arranged in the base body, one of the stator and the rotor comprises an electromagnet for generating a magnetic field with alternating directions, the other one of the stator and the rotor comprises a permanent magnet, and the rotor can reciprocate relative to the stator under the cooperation of the electromagnet and the permanent magnet;

the free end of the elastic piece is respectively connected with the rotor and the base body and is used for providing elastic restoring force for resetting the rotor, and the elastic piece is made of a memory alloy material;

and the heating power supply is electrically connected with the elastic piece and is used for providing different-intensity currents for the elastic piece so as to change the elastic coefficient of the elastic piece.

2. A variable frequency resonant actuator according to claim 1, wherein the elastic member comprises two clamping plates and an arcuate elastic connecting plate, both ends of the elastic connecting plate being connected to one of the clamping plates, respectively, one of the clamping plates being connected to the mover at an end facing away from the elastic connecting plate, and the other clamping plate being connected to the base at an end facing away from the elastic connecting plate.

3. The variable frequency resonant actuator of claim 2, wherein the elastic member further comprises a heating member disposed on the clamping plate and electrically connected to the heating power supply.

4. The variable frequency resonant actuator of claim 2, further comprising an elastic buffer disposed at an end of the clamping plate facing away from the elastic connecting plate and between the two clamping plates.

5. The variable frequency resonant actuator of claim 4, wherein the elastic buffer is further disposed on the mover and located on one side of the elastic connection plate.

6. The variable frequency resonant actuator of claim 1, further comprising an elastic support auxiliary member, wherein the elastic member is a spring, two ends of the spring are respectively connected with the mover and the base, and the elastic support auxiliary member is located at one side of the elastic member and is respectively connected with the mover and the base.

7. The variable frequency resonant actuator of any one of claims 1 to 6, wherein the base body is provided with a cavity, the stator and the mover are both accommodated in the cavity, the mover further comprises a movable block, and two ends of the movable block are respectively connected with one elastic member and are arranged at intervals from the side wall of the base body.

8. The variable frequency resonant actuator of claim 7, wherein the movable block is provided with a receiving groove with a notch facing the bottom wall of the base body, one of the permanent magnet and the electromagnet is received in the receiving groove, and the other of the permanent magnet and the electromagnet is provided on the inner wall of the base body opposite to the notch of the receiving groove.

9. An electronic device comprising a device body and the variable frequency resonant actuator of any one of claims 1 to 8 disposed on the device body.

10. The electronic device of claim 9, wherein a current controller is disposed in the device body and electrically connected to the heating power source, the current controller being configured to control the intensity of current applied to the elastic member to be at different levels so that the variable frequency resonant actuator can provide vibrations having different resonant frequencies to the electronic device.

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