A compact multi-air-gap uniform magnetic field high-thrust planar voice coil motor

Abstract

This invention relates to the field of voice coil motor technology, specifically to a compact multi-air-gap uniform magnetic field high-thrust planar voice coil motor, comprising a motor outer frame, a first stator, a second stator, and a third stator. The first stator is located in the middle of the motor outer frame. Two sets of second stators are respectively installed on both sides of the first stator, forming an inner air gap between the two sets of second stators. Two sets of third stators are respectively located at the upper and lower ends of the motor outer frame, forming an outer air gap between the second stator and the third stator. A set of first inner movers is disposed in the inner air gap, and several sets of second inner movers are disposed in the outer air gap. In this invention, the magnetic flux starts from the permanent magnet, passes through the yoke, crosses the working air gap, and returns to the main channel of the yoke, reducing magnetic flux leakage into the outer space, thereby improving magnetic field utilization and reducing magnetic leakage. The parallel operation of multiple air gaps increases the total thrust and thrust density without significantly increasing the overall size.

Description

Technical Field

[0001] This invention relates to the field of voice coil motor technology, specifically to a compact multi-air gap uniform magnetic field high-thrust planar voice coil motor. Background Technology

[0002] Traditional planar voice coil motors typically consist of a permanent magnet array, a magnetic yoke, a mover coil, and a base plate. The permanent magnets are generally radially magnetized (magnetization direction perpendicular to the plane of motion), forming a closed magnetic circuit through the magnetic yoke. The mover coil moves in the planar air gap and achieves planar displacement through the Lorentz force. This type of motor has a simple structure and is easy to manufacture, but it is limited by the magnetic circuit structure and single magnetic pole layout, resulting in limited magnetic field utilization and thrust density.

[0003] Therefore, in order to increase the thrust of traditional planar voice coil motors, it is often necessary to increase the volume of permanent magnets or the size of coils. However, increasing the radial dimension of the motor and the volume of the coil will lead to an increase in volume, weight and cost, making it difficult to meet the requirements of high-end applications for compact high-thrust drivers and to achieve high thrust output in a limited space. To address this, a compact multi-air gap uniform magnetic field high-thrust planar voice coil motor is proposed. Summary of the Invention

[0004] In order to solve the technical problems existing in the prior art, the present invention provides a compact multi-gap uniform magnetic field high-thrust planar voice coil motor.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a compact multi-air-gap uniform magnetic field high-thrust planar voice coil motor, comprising a motor outer frame, a first stator, a second stator, and a third stator. The first stator is disposed in the middle position inside the motor outer frame. Two sets of second stators are respectively installed on both sides of the first stator. The two sets of second stators cooperate with the first stator to form two sets of symmetrical inner air gaps. Two sets of third stators are respectively disposed at the upper and lower ends inside the motor outer frame. The second stator and the third stator cooperate to form two sets of symmetrical outer air gaps. A set of first inner movers is disposed in the inner air gaps, and several sets of second inner movers are disposed in the outer air gaps.

[0006] Preferably, the motor outer frame includes an outer magnetic yoke, and a set of support blocks is provided at each of the four inner corners of the outer magnetic yoke. The support blocks are triangular in shape and are made of non-magnetic material.

[0007] Preferably, the first stator includes a first magnet and a first inner yoke, with two sets of the first magnets respectively disposed on both sides of the middle position inside the outer yoke, and a first inner yoke fixed between the two sets of the first magnets.

[0008] Preferably, the magnetization direction of both sets of the first magnets is directed towards the first inner magnetic yoke.

[0009] Preferably, the second stator includes a second magnet, a third magnet, and a second inner yoke. A set of second magnets is provided on both sides of each set of first magnets. A set of third magnets is fixed on the opposite end faces of the two sets of second magnets located on the same side of the first magnet. A gap is left between the third magnets and the first magnets and the first inner yoke. A set of second inner yokes is provided between the two sets of third magnets.

[0010] Preferably, the magnetization direction of the two sets of second magnets points to the first magnet corresponding to them in the vertical direction, and the magnetization direction of the two sets of third magnets points to the second magnet that is attached to them.

[0011] Preferably, the third stator includes a third inner magnetic yoke, a fourth magnet, and a fifth magnet. The two sets of third inner magnetic yokes are respectively located at the middle position of the top end of the inner wall of the outer magnetic yoke and the middle position of the bottom end of the inner wall of the outer magnetic yoke. A set of fourth magnets is provided on both sides of each set of third inner magnetic yokes, and a set of fifth magnets is provided on the side of the fourth magnet facing the third inner magnetic yoke.

[0012] Preferably, the magnetization direction of both sets of the fourth magnets points to the third inner yoke, and the magnetization direction of both sets of the fifth magnets points to the second magnet in their vertical orientation.

[0013] Preferably, there are three sets of second internal movers, which are arranged at intervals along the extension direction of the outer air gap and are respectively located in the working area corresponding to the outer air gap. The setting position of the first internal mover coincides with the setting position of the middle second internal mover, and the current direction of the first internal mover is opposite to that of the second internal mover.

[0014] Preferably, the outer magnetic yoke, the first inner magnetic yoke, the second inner magnetic yoke, and the third inner magnetic yoke are all magnetically conductive.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] This invention comprises an outer frame of the motor, a first stator, a second stator, and a third stator. Multiple air gaps are formed between the outer frame, the first stator, the second stator, and the third stator. The effective conductor sections of the first inner mover and the second inner mover are located in the inner air gap and the outer air gap, respectively. In this design, the magnets are no longer limited to the traditional single layout of radial magnetization, but are directionally magnetized and arranged according to the needs of the multi-air gap magnetic circuit. This allows each magnetic circuit to form a relatively concentrated magnetic flux density in the corresponding air gap, and makes the magnetic flux density in the air gap as flat as possible along the direction of motion. The magnetic flux starts from the permanent magnet, crosses the working air gap through the yoke, and returns to the main channel of the yoke, reducing magnetic flux leakage into the outer space, thereby improving the magnetic field utilization rate and reducing magnetic leakage. The parallel generation of multiple air gaps increases the total thrust and thrust density without significantly increasing the overall size. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0018] Figure 2 This is a simulation diagram of the magnetic flux density of the voice coil motor A of the present invention;

[0019] Figure 3 A simulation diagram of the magnetic flux density of an existing voice coil motor B;

[0020] Figure 4 A simulation diagram of the magnetic flux density of an existing voice coil motor C;

[0021] Figure 5 A simulation diagram of the magnetic flux density of an existing voice coil motor D;

[0022] Figure 6 This is a comparison diagram of the magnetic flux density curves of the present invention.

[0023] The numbers in the diagram represent:

[0024] 1. Motor outer frame; 11. Outer yoke; 12. Support block; 2. First stator; 21. First magnet; 22. First inner yoke; 3. Second stator; 31. Second magnet; 32. Third magnet; 33. Second inner yoke; 4. Third stator; 41. Third inner yoke; 42. Fourth magnet; 43. Fifth magnet; 5. First inner mover; 6. Second inner mover. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments, which illustrate the above and other technical features and advantages of the present invention. However, the following embodiments are merely preferred embodiments of the present invention and are not exhaustive.

[0026] Example:

[0027] like Figure 1 As shown, the present invention provides a compact multi-air-gap uniform magnetic field high-thrust planar voice coil motor, including a motor outer frame 1, a first stator 2, a second stator 3, and a third stator 4. The first stator 2 is located in the middle of the motor outer frame 1. Two sets of second stators 3 are respectively installed on both sides of the first stator 2. The two sets of second stators 3 and the first stator 2 cooperate to form two sets of symmetrical inner air gaps. Two sets of third stators 4 are respectively located at the upper and lower ends of the motor outer frame 1. The second stators 3 and the third stators 4 cooperate to form two sets of symmetrical outer air gaps. A set of first inner movers 5 is arranged in the inner air gap, and several sets of second inner movers 6 are arranged in the outer air gap.

[0028] The outer frame 1 of the motor includes an outer magnetic yoke 11. The outer magnetic yoke 11 is magnetic and forms an integral rigid support and serves as the main channel of the magnetic flux circuit. A set of support blocks 12 is provided at each of the four internal corners of the outer magnetic yoke 11. The support blocks 12 are triangular in shape and are made of non-magnetic material. The support blocks 12 support the third stator 4, and the non-magnetic nature of the support blocks 12 can prevent magnetic short circuits.

[0029] The first stator 2 includes a first magnet 21 and a first inner yoke 22. Two sets of first magnets 21 are respectively disposed on both sides of the middle position inside the outer yoke 11. A first inner yoke 22 is fixed between the two sets of first magnets 21. The first inner yoke 22 is magnetically conductive. The magnetization direction of the two sets of first magnets 21 is pointing towards the first inner yoke 22. The first inner yoke 22 is used to divide the magnetic circuit into multiple relatively independent closed loops and to form an inner air gap above and below the first inner yoke 22.

[0030] The second stator 3 includes a second magnet 31, a third magnet 32, and a second inner yoke 33. A set of second magnets 31 is provided on both sides of each set of first magnets 21. A set of third magnets 32 is fixed on the opposite end face of the two sets of second magnets 31 located on the same side of the first magnets 21. A gap is left between the third magnets 32 and the first magnets 21 and the first inner yoke 22. A set of second inner yokes 33 is provided between the two sets of third magnets 32. The magnetization direction of the two sets of second magnets 31 points to the first magnets 21 corresponding to them in the vertical direction. The magnetization direction of the two sets of third magnets 32 points to the second magnets 31 that are attached to them. The second inner yoke 33 is magnetically conductive. The second inner yoke 33 is used to divide the magnetic circuit into multiple relatively independent closed loops and to form an outer air gap above and below the second inner yoke 33.

[0031] The third stator 4 includes a third inner magnetic yoke 41, a fourth magnet 42, and a fifth magnet 43. Two sets of third inner magnetic yokes 41 are respectively located at the middle position of the top end of the inner wall of the outer magnetic yoke 11 and the middle position of the bottom end of the inner wall of the outer magnetic yoke 11. A set of fourth magnets 42 is provided on both sides of each set of third inner magnetic yokes 41. A set of fifth magnets 43 is provided on the side of the fourth magnets 42 facing the third inner magnetic yoke 41. The magnetization direction of the two sets of fourth magnets 42 is pointing towards the third inner magnetic yoke 41. The magnetization direction of the two sets of fifth magnets 43 is pointing towards the second magnet 31 in their vertical direction.

[0032] There are three sets of second internal movers 6. The three sets of second internal movers 6 are arranged at intervals along the extension direction of the outer air gap and are respectively located in the working area corresponding to the outer air gap. The setting position of the first internal mover 5 coincides with the setting position of the middle second internal mover 6. The current direction of the first internal mover 5 is opposite to the current direction of the second internal mover 6.

[0033] like Figures 2-6As shown, an inner air gap and an outer air gap are formed between the outer frame 1, the first stator 2, the second stator 3, and the third stator 4 of the motor. The effective conductor sections of the first inner mover 5 and the second inner mover 6 are located in the inner air gap and the outer air gap, respectively, and are no longer limited to the following... Figures 3-5 Instead of the traditional radial magnetization configuration, this design uses directional magnetization and combination arrangement according to the needs of the inner and outer air gap magnetic circuits. This allows each magnetic circuit to form a relatively concentrated magnetic flux density in the inner and outer air gaps, and makes the magnetic flux distribution in the inner and outer air gaps more flat along the direction of motion. The magnetic flux starts from the magnet, crosses the air gap through the yoke, and returns to the main channel of the yoke, reducing magnetic flux leakage into the outer space. This improves the magnetic field utilization rate and reduces magnetic leakage. The parallel generation of multiple air gaps increases the total thrust and thrust density without significantly increasing the overall size.

[0034] The above description is merely a preferred embodiment of the present invention and is illustrative rather than restrictive. Those skilled in the art will understand that many changes, modifications, and even equivalents can be made within the spirit and scope defined by the claims of the present invention, all of which will fall within the protection scope of the present invention.

Claims

1. A compact multi-air-gap uniform magnetic field high-thrust planar voice coil motor, characterized in that, The motor includes an outer frame (1), a first stator (2), a second stator (3), and a third stator (4). The first stator (2) is located in the middle of the inner part of the outer frame (1). Two sets of second stators (3) are installed on both sides of the first stator (2). The two sets of second stators (3) and the first stator (2) cooperate to form two sets of symmetrical inner air gaps. Two sets of third stators (4) are located at the upper and lower ends of the inner part of the outer frame (1). The second stator (3) and the third stator (4) cooperate to form two sets of symmetrical outer air gaps. A set of first inner movers (5) is provided in the inner air gap, and several sets of second inner movers (6) are provided in the outer air gap.

2. The compact multi-air-gap uniform magnetic field high-thrust planar voice coil motor as described in claim 1, characterized in that, The motor outer frame (1) includes an outer magnetic yoke (11), and a set of support blocks (12) are provided at each of the four inner corners of the outer magnetic yoke (11). The support blocks (12) are triangular in shape and are made of non-magnetic material.

3. The compact multi-air-gap uniform magnetic field high-thrust planar voice coil motor as described in claim 1, characterized in that, The first stator (2) includes a first magnet (21) and a first inner yoke (22). The two sets of first magnets (21) are respectively disposed on both sides of the middle position inside the outer yoke (11), and a set of first inner yokes (22) is fixed between the two sets of first magnets (21).

4. A compact multi-air-gap uniform magnetic field high-thrust planar voice coil motor as described in claim 3, characterized in that, The magnetization direction of both sets of the first magnets (21) is directed towards the first inner yoke (22).

5. A compact multi-air-gap uniform magnetic field high-thrust planar voice coil motor as described in claim 4, characterized in that, The second stator (3) includes a second magnet (31), a third magnet (32), and a second inner yoke (33). A set of second magnets (31) is provided on both sides of each set of first magnets (21). A set of third magnets (32) is fixed on the opposite end face of the two sets of second magnets (31) located on the same side of the first magnet (21). A gap is left between the third magnet (32) and the first magnet (21) and the first inner yoke (22). A set of second inner yokes (33) is provided between the two sets of third magnets (32).

6. A compact multi-air-gap uniform magnetic field high-thrust planar voice coil motor as described in claim 5, characterized in that, The magnetization direction of the two sets of second magnets (31) points to the first magnet (21) corresponding to them in the vertical direction, and the magnetization direction of the two sets of third magnets (32) points to the second magnet (31) that is attached to them.

7. A compact multi-air-gap uniform magnetic field high-thrust planar voice coil motor as described in claim 1, characterized in that, The third stator (4) includes a third inner magnetic yoke (41), a fourth magnet (42) and a fifth magnet (43). The two sets of third inner magnetic yokes (41) are respectively located at the middle position of the top of the inner wall of the outer magnetic yoke (11) and the middle position of the bottom of the inner wall of the outer magnetic yoke (11). A set of fourth magnets (42) is provided on both sides of each set of third inner magnetic yokes (41), and a set of fifth magnets (43) is provided on the side of the fourth magnets (42) facing the third inner magnetic yokes (41).

8. A compact multi-air-gap uniform magnetic field high-thrust planar voice coil motor as described in claim 7, characterized in that, The magnetization direction of both sets of fourth magnets (42) points to the third inner yoke (41), and the magnetization direction of both sets of fifth magnets (43) points to the second magnet (31) in their vertical orientation.

9. A compact multi-air-gap uniform magnetic field high-thrust planar voice coil motor as described in claim 1, characterized in that, The second internal mover (6) is provided in three groups. The three groups of the second internal mover (6) are arranged at intervals along the extension direction of the outer air gap and are respectively located in the working area corresponding to the outer air gap. The setting position of the first internal mover (5) coincides with the setting position of the middle second internal mover (6). The current direction of the first internal mover (5) is opposite to the current direction of each second internal mover (6).

10. A compact multi-air-gap uniform magnetic field high-thrust planar voice coil motor as described in claim 8, characterized in that, The outer magnetic yoke (11), the first inner magnetic yoke (22), the second inner magnetic yoke (33) and the third inner magnetic yoke (41) are all magnetic.

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