Reciprocating driver and system

Abstract

The invention relates to the technical field of drivers, and provides a reciprocating driver and system.The reciprocating driver comprises a driver shell, a first output shaft, a first permanent magnet, a magnetoelectric sensor and two sets of electromagnetic coils, and the interior of the driver shell is provided with a motion space and shaft holes which communicate with the motion space and are formed in the two sides of the motion space; the first output shaft is a magnetic conductive material body, is arranged in the shaft hole and penetrates through the motion space; the first permanent magnet is arranged in the motion space and assembled on the first output shaft; the magnetoelectric sensor is used for detecting the displacement and / or position of the first output shaft; reciprocating driving of the small-size slender driver is achieved through cooperation of the electromagnetic sensor, the one or more permanent magnets and the two electromagnetic coils, the harsh machining precision requirement of parts is lowered, the assembling and integrating difficulty is lowered, the magnetic material requirement is lowered, the cost is lowered, and the manufacturing cost is lowered. The assembly and design problems of the small-size slender reciprocating driver are solved, and the practicability is high.

Description

Technical Field

[0001] The present invention relates to the technical field of drivers, and in particular to a reciprocating driver and a system. Background Art

[0002] A linear motor is a transmission device that converts electrical energy directly into linear motion mechanical energy without any intermediate conversion mechanism. It is also called a linear motor, linear motor, etc. Electromagnets are widely used in reciprocating motion mechanisms to achieve reciprocating linear magnetic drive, but in order to increase the driving force, multiple magnets are often used to increase the magnetic driving force.

[0003] However, when assembling multiple magnets or magnet assemblies in a small and slender drive, permanent magnets and electromagnetic excitation coils are often paired and appear in multiple groups, and the processing requirements and the requirements for the installation coaxiality of the motion circumference are high, that is, the assembly accuracy requirements are very high. This situation will inevitably lead to higher requirements for the processing accuracy of each component, which will eventually lead to an increase in product costs. In addition, the detection of displacement in the reciprocating drive is usually equipped with a grating ruler for detection. The installation of the grating ruler inside the reciprocating drive with a small and slender structure increases the difficulty of integration, and also becomes a technical problem in the assembly and design of small and slender reciprocating drives. Summary of the invention

[0004] In view of the defects in the prior art, an object of the present invention is to provide a reciprocating drive and system.

[0005] A reciprocating drive according to the present invention comprises:

[0006] A driver housing having a movement space inside and shaft holes communicating with the movement space and arranged on both sides of the movement space;

[0007] A first output shaft, which is a magnetic conductive material, is arranged in the shaft hole and passes through the movement space;

[0008] A first permanent magnet is arranged inside the motion space and mounted on the first output shaft;

[0009] a magnetoelectric sensor for detecting a displacement and / or position of the first output shaft;

[0010] Two groups of electromagnetic coils are arranged along the circumference of the axial hole. The first group of electromagnetic coils is located on one side of the movement space, and the second group of electromagnetic coils is located on the other side of the movement space. When the first group of electromagnetic coils is powered by positive electricity and the second group of electromagnetic coils is powered by negative electricity, the magnetic field generated can drive the first permanent magnet and the first output shaft to move in a first axial direction. When the first group of electromagnetic coils is powered by negative electricity and the second group of electromagnetic coils is powered by positive electricity, the magnetic field generated can drive the first permanent magnet and the first output shaft to move in a second axial direction. The first output shaft can also achieve reciprocating motion by continuously changing the direction of the current passed into the electromagnetic coils, wherein the first direction is opposite to the second direction.

[0011] Preferably, when the first permanent magnet reciprocates in the motion space, the displacement and / or position detection is achieved by collecting the voltage signal of the magnetoelectric sensor.

[0012] Preferably, the magnetoelectric sensor is a composite structure of a magnetostrictive material body and a piezoelectric material body; or the magnetoelectric sensor is a piezoelectric material body.

[0013] Preferably, the number of the first permanent magnets is multiple, and the multiple first permanent magnets are arranged on the first output shaft at intervals.

[0014] Preferably, the movement space provides a limit for the movement range of the first permanent magnet.

[0015] Preferably, a first elastomer is provided at one end of the first output shaft, and the first elastomer is arranged inside the drive housing, and satisfies the condition that when the first output shaft moves toward the first elastomer, the first elastomer is elastically compressed to store elastic potential energy and has a tendency to release the elastic potential energy in real time in this state.

[0016] Preferably, it also includes a second elastomer arranged in the movement space, and when the first output shaft moves away from the first elastomer, the second elastomer can be gradually compressed to store elastic potential energy, wherein, in a natural state, the first elastomer and the second elastomer can make the first permanent magnet stationary in an initial state.

[0017] Preferably, the magnetoelectric sensor is configured at any of the following positions:

[0018] The device is configured outside the driver housing and arranged on one side of the motion space;

[0019] configured inside the driver housing and arranged at the end of the first output shaft;

[0020] Preferably, a second output shaft is coaxially arranged with the first output shaft, the second output shaft is detachably connected to the first output shaft and the end of the second output shaft extends to the outside of the driver housing, and the second output shaft is made of non-magnetic material.

[0021] Preferably, a second permanent magnet is further configured, and the second permanent magnet is configured at the end of the first output shaft or at the end of the second output shaft.

[0022] A system provided according to the present invention comprises the reciprocating drive.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The present invention preferably realizes the reciprocating drive of a small and slender driver by adopting a permanent magnet and two electromagnetic coils, which reduces the stringent processing accuracy requirements for each component, reduces the difficulty of assembly, and has low cost. By adopting electromagnetic sensors, the difficulty of integrating small-volume equipment is reduced, and the technical difficulties in assembling and designing small and slender reciprocating drivers are solved, and the practicality is strong. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0026] Figure 1 It is a schematic diagram of the structure of the reciprocating drive;

[0027] Figure 2 It is a schematic diagram of the structure of the reciprocating drive after being cut along the axial direction;

[0028] Figure 3 It is a schematic diagram of the structure of the reciprocating drive after being cut along the axial direction, wherein two embodiments of the magnetoelectric sensor being arranged inside and outside the housing are shown;

[0029] Figure 4 It is a schematic diagram of the structure of the reciprocating drive after being cut along the axial direction, wherein a second permanent magnet is provided.

[0030] The figure shows:

[0031] First output shaft 1

[0032] Sports Space 11

[0033] Axis hole 12

[0034] Second output shaft 13

[0035] The first permanent magnet 2

[0036] The second permanent magnet 21

[0037] First elastic body 3

[0038] Stop ring 4

[0039] Second elastic body 5

[0040] Magnetoelectric sensor 6

[0041] Excitation coil 61

[0042] Magnetostrictive material body 62

[0043] Piezoelectric material body 63

[0044] Auxiliary permanent magnet 64

[0045] Graphite copper sleeve 7

[0046] Auxiliary installation bushing 8

[0047] Solenoid coil 9

[0048] Driver housing 10 DETAILED DESCRIPTION

[0049] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0050] Embodiment 1:

[0051] The present invention provides a reciprocating drive, such as Figure 1As shown, it includes a first output shaft 1, a first permanent magnet 2, a magnetoelectric sensor 6, two groups of electromagnetic coils 9 and a driver housing 10. The driver housing 10 has a motion space 11 arranged in the middle and an axial hole 12 connected to the motion space 11 and arranged on both sides of the motion space 11. The first output shaft 1 is arranged in the axial hole 12 and passes through the motion space 11; the first permanent magnet 2 is arranged inside the motion space 11 and assembled on the first output shaft 1; among the two groups of electromagnetic coils 9, the first group of electromagnetic coils 9 is arranged along the circumference of the axial hole 12 and is located on one side of the motion space 11, and the second group of electromagnetic coils 9 is arranged along the circumference of the axial hole 12 and is located On the other side of the motion space 11, when the first group of electromagnetic coils 9 are powered by positive electricity and the second group of electromagnetic coils 9 are powered by negative electricity, the magnetic field generated can drive the first permanent magnet 2 to drive the first output shaft 1 to move in the first axial direction; when the first group of electromagnetic coils 9 are powered by negative electricity and the second group of electromagnetic coils 9 are powered by positive electricity, the magnetic field generated can drive the first permanent magnet 2 to drive the first output shaft 1 to move in the second axial direction; the reciprocating drive can realize the reciprocating motion of the first output shaft 1 and thus realize the reciprocating drive function by continuously changing the direction of the current passed into the electromagnetic coils 9, wherein the first direction is opposite to the second direction.

[0052] It should be noted that, since the electromagnetic coil 9 is arranged along the circumference of the first output shaft 1, and is not directly arranged on the side of the first permanent magnet 2, the first output shaft 1 is designed as a magnetic conductive material body, which can realize the transmission of magnetic force and thus realize a more effective magnetic force effect between the electromagnetic coil 9 and the first permanent magnet 2, thereby achieving a stronger magnetic driving effect. At the same time, there are multiple first permanent magnets 2, and multiple first permanent magnets 2 are spaced apart and mounted on the first output shaft 1. The magnetic driving effect is enhanced by setting multiple first permanent magnets 2 and arranging them at intervals. However, it should be noted that due to the limited length of the motion space 11, in order to meet the needs of the reciprocating motion stroke, the spacing distance and number of the first permanent magnets 2 need to be reasonably designed to meet the actual needs of the product.

[0053] In this embodiment, a second permanent magnet 21 may be further configured. Specifically, the second permanent magnet 21 is configured at the end of the first output shaft 1 or at the end of the second output shaft 13, and generates suction or magnetic force between the second permanent magnet 21 and the electromagnetic coil 9 close to the second permanent magnet 21 to assist the reciprocating motion, increase the driving force, and achieve a better driving reciprocating effect.

[0054] like Figure 3As shown, the magnetoelectric sensor 6 is configured outside the driver housing 10 or embedded on the wall of the driver housing 10, and is arranged on one side of the motion space 11 or on one side of the first output shaft 1; the magnetoelectric sensor 6 is preferably a composite structure of a magnetostrictive material body 62 and a piezoelectric material body 63 connected in series, and an excitation coil 61 is arranged on the circumference of the magnetostrictive material body 62. When the first permanent magnet 2 follows the first output shaft 1 to make a reciprocating motion, the magnetic field at the location of the magnetostrictive material body changes through the excitation coil 61, thereby causing the magnetostrictive material body to have an elongation or shortening change. The force brought by the elongation or shortening acts on the piezoelectric material body to cause a change in the potential difference of the piezoelectric material body. The change in the potential difference has a corresponding relationship with the motion position of the first permanent magnet 2. The motion displacement or position relationship of the first permanent magnet 2 can be obtained by collecting the voltage signal of the piezoelectric material body. That is, when the first permanent magnet 2 reciprocates in the motion space 11, the displacement and / or position detection can be realized by collecting the change in the voltage signal of the magnetoelectric sensor 6.

[0055] The motion space 11 provides a limit for the motion stroke of the first permanent magnet 2. The first permanent magnet 2 is configured on the outer wall of the first output shaft 1, for example, is sleeved on the first output shaft 1, wherein, during the reciprocating motion, the first permanent magnet 2 is not allowed to enter the shaft hole 12, that is, when the first permanent magnet 2 moves and contacts the inner wall of the motion space 11, it can be blocked by the motion space 11, thereby achieving the limitation of the motion stroke of the first permanent magnet 2.

[0056] A first elastomer 3 is provided at one end of the first output shaft 1. The first elastomer 3 is arranged inside the drive housing 10, and satisfies the situation that when the first output shaft 1 moves toward the first elastomer 3, the first elastomer 3 is elastically compressed to store elastic potential energy and has a tendency to release the elastic potential energy in real time in this state. When the movement direction of the first output shaft 1 suddenly changes, the energy of the first elastomer 3 that is compressed and stores elastic potential energy is released, thereby assisting the movement of the first output shaft 1, so that the first output shaft 1 quickly retreats under the drive of the magnetic force and the elastic force of the first elastomer 3, thereby increasing the power of retreat.

[0057] In a possible embodiment, it also includes a second elastic body 5 arranged in the motion space 11. When the first output shaft 1 moves away from the first elastic body 3, the second elastic body 5 can be gradually compressed, so that the second elastic body 5 stores elastic potential energy, wherein, in a natural state, since the elastic force directions of the first elastic body 3 and the second elastic body 5 on the first output shaft 1 are opposite, the first permanent magnet 2 can reach a state of force balance, which is defined as an initial state. It should be noted that the first elastic body 3 and the second elastic body 5 are preferably springs. In different application scenarios, the elastic body can also use other elastic parts, such as rubber parts, elastic sheets and other structures.

[0058] like Figure 1 As shown, a second output shaft 13 is also provided on the side of the displacement output of the first output shaft 1. The second output shaft 13 and the end of the first output shaft 1 are preferably connected as a whole by threading. The second output shaft 13 is made of non-magnetic material, and the output shaft 1 is made of soft magnetic material. The first permanent magnet 2 is placed in the middle of the first output shaft 1. The position of the first permanent magnet 2 can be adjusted by the first elastomer 3, and the first elastomer 3 is fixed by a stop ring 4 fixed on the output shaft 1.

[0059] Furthermore, a graphite copper sleeve 7 and an embedded auxiliary mounting bushing 8 are also provided inside the driver housing 10 . The graphite copper sleeve 7 and the embedded auxiliary mounting bushing 8 for guiding the first output shaft 1 are disposed at the ends of the electromagnetic coil 9 and on both sides of the first output shaft 1 .

[0060] Embodiment 2:

[0061] The present embodiment is different from the first embodiment in that the magnetoelectric sensor 6 is embedded in the driver housing 10 and is located at the end of the first output shaft 1, and includes a magnetostrictive material body 62 and a piezoelectric material body 63 arranged in series, and an excitation coil 61 arranged around the magnetostrictive material body 62. The displacement and / or position of the output shaft is determined by changing the voltage signal of the piezoelectric material body 63 based on the magnetic conductivity of the first output shaft 1.

[0062] In practical applications, an auxiliary permanent magnet 64 may be disposed inside the driver housing 10 to assist the magnetic field sensing of the magnetoelectric sensor 6, strengthen the intensity of the magnetic field change, and increase the sensitivity of voltage signal recognition.

[0063] Embodiment 3:

[0064] This embodiment is different from Embodiment 1 in that the magnetoelectric sensor 6 includes a piezoelectric material body 63, which is arranged between the first output shaft 1 and the second output shaft 13, and one end of the piezoelectric material body 63 is connected to the first output shaft 1 or the second output shaft 13 through an elastic body or an elastic sheet, so that during the reciprocating motion of the output shaft in the axial direction, the piezoelectric material body 63 is in a state of being compressed or pulled in real time, and the voltage signal generated is also in a state of changing in real time, thereby realizing the detection of the movement state of the output shaft.

[0065] The working principle of the present invention is as follows:

[0066] The permanent magnet 1 is in the initial state, the first output shaft 1 is biased to one side of the driver, and after the electromagnetic coil 9 is energized, one side of the electromagnetic coil 9 generates attraction, and the other side of the electromagnetic coil 9 generates repulsion, which synchronously pushes the mover to move along the length direction to produce full stroke. Changing the direction of the current flowing through the electromagnetic coil 9 will drive the mover to move in the opposite direction through magnetic force, and reciprocatingly changing the direction of the current flowing through the electromagnetic coil 9 will complete the reciprocating drive function of the mover.

[0067] Sensing principle: The excitation coil 61 provides weak resonant excitation for the magnetoelectric composite material. During the movement of the mover, the magnetoelectric material moves along the axis of the excitation coil 61. The first output shaft 1 is made of magnetic conductive material. During the movement, the end of the first output shaft 1 deviates from the excitation coil 61, and the axial air gap of the excitation coil 61 increases. The magnetic field passing through the magnetoelectric material changes, and the magnetoelectric sensor 6 outputs a sensing signal related to the position.

[0068] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0069] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A reciprocating drive, characterized in that: include: A driver housing (10) having a movement space (11) therein and shaft holes (12) communicating with the movement space (11) and arranged on both sides of the movement space (11); A first output shaft (1) is made of a magnetically conductive material and is arranged in the shaft hole (12) and passes through the movement space (11); A first permanent magnet (2) is arranged inside the movement space (11) and mounted on the first output shaft (1); A magnetoelectric sensor (6) for detecting the displacement and / or position of the first output shaft (1); Two groups of electromagnetic coils (9) are arranged along the circumference of the shaft hole (12), the first group of electromagnetic coils (9) is located on one side of the movement space (11), and the second group of electromagnetic coils (9) is located on the other side of the movement space (11). When the first group of electromagnetic coils (9) is powered by positive current and the second group of electromagnetic coils (9) is powered by negative current, the magnetic field generated can drive the first permanent magnet (2) and the first output shaft (1) to move in a first axial direction; when the first group of electromagnetic coils (9) is powered by negative current and the second group of electromagnetic coils (9) is powered by positive current, the magnetic field generated can drive the first permanent magnet (2) and the first output shaft (1) to move in a second axial direction; and the first output shaft (1) can achieve reciprocating motion by continuously changing the direction of the current passed into the electromagnetic coils (9), wherein the first direction is opposite to the second direction.

2. The reciprocating drive according to claim 1, characterized in that When the first permanent magnet (2) reciprocates in the motion space (11), detection of displacement and / or position is achieved by collecting a voltage signal of a magnetoelectric sensor (6); The movement space (11) provides a limit for the movement range of the first permanent magnet (2).

3. The reciprocating drive according to claim 1, characterized in that The magnetoelectric sensor (6) is a composite structure of a magnetostrictive material body and a piezoelectric material body; or the magnetoelectric sensor (6) is a piezoelectric material body.

4. The reciprocating drive according to claim 1, characterized in that There are a plurality of the first permanent magnets (2), and the plurality of the first permanent magnets (2) are arranged at intervals on the first output shaft (1).

5. The reciprocating drive according to claim 1, characterized in that A first elastic body (3) is provided at one end of the first output shaft (1). The first elastic body (3) is arranged inside the drive housing (10) and satisfies the condition that when the first output shaft (1) moves toward the first elastic body (3), the first elastic body (3) is elastically compressed to store elastic potential energy and has a tendency to release the elastic potential energy in real time in this state.

6. The reciprocating drive according to claim 5, characterized in that It also includes a second elastic body (5) arranged in the movement space (11), and when the first output shaft (1) moves away from the first elastic body (3), the second elastic body (5) can be gradually compressed to store elastic potential energy, wherein, in a natural state, the first elastic body (3) and the second elastic body (5) can make the first permanent magnet (2) stationary in an initial state.

7. The reciprocating drive according to claim 1, characterized in that The magnetoelectric sensor (6) is arranged at any of the following positions: The drive housing (10) is configured outside the drive housing (10) and arranged on one side of the motion space (11); It is configured inside the driver housing (10) and arranged at the end of the first output shaft (1).

8. The reciprocating drive according to claim 1, characterized in that A second output shaft (13) is also provided which is coaxially arranged with the first output shaft (1). The second output shaft (13) is detachably connected to the first output shaft (1) and an end of the second output shaft (13) extends to the outside of the driver housing (10). The second output shaft (13) is made of non-magnetic material.

9. The reciprocating drive according to claim 8, characterized in that A second permanent magnet (21) is also provided, and the second permanent magnet (21) is provided at the end of the first output shaft (1) or at the end of the second output shaft (13).

10. A system, characterized in that: A reciprocating drive comprising any one of claims 1 to 9.

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