Light-weight short-stroke high-thrust-density rectangular voice coil motor

Abstract

The invention relates to the technical field of voice coil motors, in particular to a lightweight short-stroke high-thrust-density rectangular voice coil motor, which comprises a motor shell, a first magnetic group, a second magnetic group, a third magnetic group and a coil, and is characterized in that the first magnetic group, the second magnetic group and the third magnetic group are fixed in the motor shell side by side at intervals; the parallel magnetized permanent magnet is used as a main source of magnetomotive force in a magnetic circuit, and the inner shell and the vertical magnetized permanent magnet are used as assistants, so that the magnetic flux density of a gas-gap magnetic field can be greatly increased, the thrust constant and the thrust density of the motor are improved, and the thrust constant and the thrust density of the motor are improved. The non-magnetic first outer shell is adopted to ensure that most magnetic flux passes through the air gap, and the magnetic second outer shell and the magnetic inner shell are adopted to reduce the magnetic leakage of the parallel magnetized permanent magnets and enhance the air gap magnetic field.

Description

Technical Field

[0001] This invention relates to the field of voice coil motor technology, specifically to a lightweight, short-stroke, high-thrust-density rectangular voice coil motor. Background Technology

[0002] A voice coil motor is a direct drive motor based on the Lorentz force principle. Its core structure consists of a permanent magnet and a current-carrying coil. According to the different moving parts, it is mainly divided into two categories: moving coil and moving magnet. The moving coil voice coil motor has extremely high acceleration and dynamic response speed because the moving coil is lightweight and has low inertia. The moving magnet voice coil motor has extremely high system life and reliability because the coil is fixed.

[0003] Traditional rectangular voice coil motors only use vertically magnetized permanent magnets, are highly dependent on the magnetic yoke, and have a low magnetic flux density in the air gap magnetic field. As a result, the motor has a large mass and low thrust density. Therefore, a lightweight, short-stroke, high-thrust-density rectangular voice coil motor is proposed. Summary of the Invention

[0004] To address the technical problems existing in the prior art, the present invention provides a lightweight, short-stroke, high-thrust-density rectangular voice coil motor.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a lightweight, short-stroke, high-thrust-density rectangular voice coil motor, comprising a motor housing, a first magnetic group, a second magnetic group, a third magnetic group, and a coil;

[0006] The first magnetic group, the second magnetic group, and the third magnetic group are fixed side by side and spaced apart inside the motor housing, and the coil is disposed between the first magnetic group, the second magnetic group, and the third magnetic group.

[0007] Preferably, the motor housing includes a first outer shell, a second outer shell, and an inner shell. Two sets of the first outer shells are arranged in parallel, and two sets of the second outer shells are arranged on both sides inside the two sets of the first outer shells. The first outer shells and the second outer shells form a rectangular first outer shell. Two sets of the inner shells are arranged at intervals inside the first outer shells. The first magnetic group is arranged in a first interval between one set of inner shells and one side of the second outer shell. The second magnetic group is arranged in a second interval between the two sets of inner shells. The third magnetic group is arranged in a third interval between the other set of inner shells and the other side of the second outer shell.

[0008] Preferably, the first outer shell, the second outer shell, and the inner shell are all selectively made of magnetic or non-magnetic materials;

[0009] Preferably, the first outer shell is non-magnetic, the second outer shell is magnetic, and the inner shell is magnetic.

[0010] Preferably, it also includes a fourth magnetic group and a fifth magnetic group, each of which is provided in two sets. The two sets of fourth magnetic groups are respectively fixed to the end surfaces of one set of inner shells, and the two sets of fifth magnetic groups are respectively fixed to the end surfaces of the other set of inner shells.

[0011] Preferably, the first magnetic assembly includes a first magnet A and a first magnet B, with the first magnet A disposed in the upper part of the first interval and the first magnet B disposed in the lower part of the first interval.

[0012] Preferably, the second magnetic assembly includes a second magnet A and a second magnet B, with the second magnet A disposed in the lower part of the second interval and the second magnet B disposed in the upper part of the second interval.

[0013] Preferably, the third magnetic group includes a third magnet A and a third magnet B, with the third magnet A disposed in the lower part of the third interval and the third magnet B disposed in the upper part of the third interval.

[0014] Preferably, the magnetization directions of the first magnet A, the second magnet A, and the third magnet A are consistent, the magnetization directions of the first magnet B, the second magnet B, and the third magnet B are consistent, and the magnetization directions of the first magnet A, the second magnet A, and the third magnet A are opposite to the magnetization directions of the first magnet B, the second magnet B, and the third magnet B.

[0015] Preferably, the magnetization directions of the fourth and fifth magnetic groups are opposite, the width of the fourth and fifth magnetic groups is the same as the width of the inner shell, and the width of one side of the coil is greater than the width of the inner shell.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] 1. This invention uses parallel magnetized permanent magnets as the main source of magnetomotive force in the magnetic circuit, with the inner shell and vertically magnetized permanent magnets as auxiliary components, which can significantly increase the magnetic flux density of the air gap magnetic field and improve the thrust constant and thrust density of the motor.

[0018] 2. The present invention uses a non-magnetic first outer shell to ensure that most of the magnetic flux passes through the air gap, and uses a magnetic second outer shell and inner shell to reduce the leakage magnetic field of the parallel magnetized permanent magnet and enhance the air gap magnetic field.

[0019] 3. The present invention uses a non-magnetic first outer shell as part of the motor housing, which is lighter than the traditional structure in the same volume, effectively reducing the overall weight of the motor. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0021] Figure 2 This is an assembly diagram of the present invention;

[0022] Figure 3 This is a schematic diagram of the magnetization direction of the present invention;

[0023] Figure 4 This is a schematic diagram of the magnetic field lines of the present invention;

[0024] Figure 5 This is a simulation diagram of motor housing configuration A of the present invention;

[0025] Figure 6 This is a simulation diagram of motor housing configuration B of the present invention;

[0026] Figure 7 This is a simulation diagram of the motor housing configuration C of the present invention;

[0027] Figure 8 This is a simulation diagram of the motor housing configuration D of the present invention;

[0028] Figure 9 This is a simulation diagram of the motor housing configuration E of the present invention;

[0029] Figure 10 This is a simulation diagram of the motor housing configuration F of the present invention;

[0030] Figure 11 This is a simulation diagram of the motor housing configuration G of the present invention;

[0031] Figure 12 This is a simulation diagram of the motor housing configuration H of the present invention;

[0032] Figure 13 The simulation results are shown for the motor housing configurations A, B, C, D, E, F, G, and H of the present invention.

[0033] The numbers in the image represent:

[0034] 1. Motor housing; 11. First outer shell; 12. Second outer shell; 13. Inner shell; 2. First magnetic group; 21. First magnet A; 22. First magnet B; 3. Second magnetic group; 31. Second magnet A; 32. Second magnet B; 4. Third magnetic group; 41. Third magnet A; 42. Third magnet B; 5. Coil; 6. Fourth magnetic group; 7. Fifth magnetic group. Detailed Implementation

[0035] 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.

[0036] Example 1:

[0037] like Figures 1-13As shown, the present invention provides a lightweight, short-stroke, high-thrust-density rectangular voice coil motor, including a motor housing 1, a first magnetic group 2, a second magnetic group 3, a third magnetic group 4, and a coil 5; the first magnetic group 2, the second magnetic group 3, and the third magnetic group 4 are fixed side by side at intervals inside the motor housing 1, and the coil 5 is disposed between the first magnetic group 2, the second magnetic group 3, and the third magnetic group 4.

[0038] The motor housing 1 includes a first outer shell 11, a second outer shell 12, and an inner shell 13. Two sets of first outer shells 11 are arranged in parallel, and two sets of second outer shells 12 are arranged on both sides inside the two sets of first outer shells 11. The first outer shells 11 and the second outer shells 12 form a rectangular first outer shell. Two sets of inner shells 13 are provided, and the two sets of inner shells 13 are arranged at intervals inside the first outer shells 11.

[0039] The first magnetic group 2 is disposed in a first interval between a set of inner shells 13 and a second outer shell 12 on one side. The first magnetic group 2 includes a first magnet A21 and a first magnet B22, with the first magnet A21 disposed in the upper part of the first interval and the first magnet B22 disposed in the lower part of the first interval. The second magnetic group 3 is disposed in a second interval between two sets of inner shells 13. The second magnetic group 3 includes a second magnet A31 and a second magnet B32, with the second magnet A31 disposed in the lower part of the second interval and the second magnet B32 disposed in the upper part of the second interval. The third magnetic group 4 is disposed in a third interval between another set of inner shells 13 and a second outer shell 12 on the other side. The third magnetic group 4 includes a third magnet A41 and a second magnet B22. Three magnets B42, a third magnet A41 is disposed in the lower part of the third interval, and a third magnet B42 is disposed in the upper part of the third interval; the magnetization directions of the first magnet A21, the second magnet A31 and the third magnet A41 are the same, the magnetization directions of the first magnet B22, the second magnet B32 and the third magnet B42 are the same, the magnetization directions of the first magnet A21, the second magnet A31 and the third magnet A41 are opposite to the magnetization directions of the first magnet B22, the second magnet B32 and the third magnet B42, and the first magnet A21 is parallel to the first magnet B22, the second magnet A31 and the second magnet B32, and the third magnet A41 and the third magnet B42 are all arranged in a state where they are parallel and have opposite magnetization directions;

[0040] The first magnetic group 2, the second magnetic group 3, and the third magnetic group 4 work together to generate a converging vertical magnetic field at the location of the coil. The magnetic field passes through the coil 5 and generates a pushing force that pushes the coil 5. Because the first outer shell 11 is made of non-magnetic material, and the second outer shell 12 and the inner shell 13 are made of magnetic material, the magnetic reluctance of the second outer shell 12 and the inner shell 13 is much smaller than that of the first outer shell 11. Furthermore, since the magnetic flux preferentially flows to the magnetic circuit part with low magnetic reluctance, the closed magnetic circuit formed does not pass through the first outer shell 11, but passes through the air gap, allowing the main magnetic flux to pass through the coil.

[0041] The magnetic field lines are densely distributed on the second outer shell 12 on the left and right sides, reducing the leakage magnetic field of the first magnetic group 2, the second magnetic group 3 and the third magnetic group 4. The short-stroke, high-thrust rectangular voice coil motor also includes a fourth magnetic group 6 and a fifth magnetic group 7. There are two sets of the fourth magnetic group 6 and the fifth magnetic group 7. The two sets of the fourth magnetic group 6 are fixed to the end surfaces of the two ends of one set of inner shell 13, and the two sets of the fifth magnetic group 7 are fixed to the end surfaces of the other set of inner shell 13. The magnetization directions of the fourth magnetic group 6 and the fifth magnetic group 7 are opposite. The width of the fourth magnetic group 6 and the fifth magnetic group 7 is the same as the width of the inner shell 13. The width of one side of the coil 5 is greater than the width of the inner shell 13. The fourth magnetic group 6 and the fifth magnetic group 7 further strengthen the converging vertical magnetic field. The coil 5 can completely cover the converging vertical magnetic field. The coil 5 can be in the strongest magnetic field within the range of motion, reducing the thrust fluctuation during the movement of the coil 5.

[0042] Example 2:

[0043] A lightweight, short-stroke, high-thrust-density rectangular voice coil motor is constructed, comprising a motor housing 1, a first magnetic group 2, a second magnetic group 3, a third magnetic group 4, and a coil 5. The first magnetic group 2, the second magnetic group 3, and the third magnetic group 4 are fixed side by side at intervals inside the motor housing 1, and the coil 5 is disposed between the first magnetic group 2, the second magnetic group 3, and the third magnetic group 4.

[0044] The motor housing 1 includes a first outer shell 11, a second outer shell 12, and an inner shell 13. The magnetically conductive first outer shell 11, the non-magnetically conductive first outer shell 11, the magnetically conductive second outer shell 12, the non-magnetically conductive outer shell 12, the magnetically conductive inner shell 13, and the non-magnetically conductive inner shell 13 are combined to form eight different configurations of motor housing 1: A, B, C, D, E, F, G, and H. The motor housing 1 of configurations A, B, C, D, E, F, G, and H are simulated one by one, and the simulation results are summarized into Table 1.

[0045] Table 1. Simulation results of motor housings with different configurations

[0046]

[0047] As shown in Table 1, when configuration D is selected, namely the non-magnetic first outer shell 11, the magnetic second outer shell 12, and the magnetic inner shell 13, the air gap magnetic flux density is the largest, which is the optimal configuration.

[0048] 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 lightweight, short-stroke, high-thrust-density rectangular voice coil motor, characterized in that, It includes a motor housing (1), a first magnetic group (2), a second magnetic group (3), a third magnetic group (4), and a coil (5); The first magnetic group (2), the second magnetic group (3) and the third magnetic group (4) are fixed side by side at intervals inside the motor housing (1), and the coil (5) is disposed between the first magnetic group (2), the second magnetic group (3) and the third magnetic group (4).

2. The lightweight, short-stroke, high-thrust-density rectangular voice coil motor as described in claim 1, characterized in that, The motor housing (1) includes a first outer shell (11), a second outer shell (12), and an inner shell (13). Two sets of the first outer shell (11) are arranged in parallel, and two sets of the second outer shell (12) are arranged on both sides inside the two sets of the first outer shell (11). The first outer shell (11) and the second outer shell (12) form a rectangular first outer shell. Two sets of the inner shell (13) are arranged at intervals inside the first outer shell (11). The first magnetic group (2) is arranged in the first interval between one set of inner shell (13) and one side of the second outer shell (12). The second magnetic group (3) is arranged in the second interval between the two sets of inner shell (13). The third magnetic group (4) is arranged in the third interval between the other set of inner shell (13) and the other side of the second outer shell (12).

3. A lightweight, short-stroke, high-thrust-density rectangular voice coil motor as described in claim 2, characterized in that, The first outer shell (11), the second outer shell (12), and the inner shell (13) are all selectively made of magnetic or non-magnetic materials.

4. A lightweight, short-stroke, high-thrust-density rectangular voice coil motor as described in claim 3, characterized in that, The first outer shell (11) is non-magnetic, the second outer shell (12) is magnetic, and the inner shell (13) is magnetic.

5. A lightweight, short-stroke, high-thrust-density rectangular voice coil motor as described in claim 2, characterized in that, It also includes a fourth magnetic group (6) and a fifth magnetic group (7). The fourth magnetic group (6) and the fifth magnetic group (7) are each provided in two sets. The two sets of the fourth magnetic group (6) are respectively fixed on the end surfaces of the two ends of one set of inner shells (13), and the two sets of the fifth magnetic group (7) are respectively fixed on the end surfaces of the other set of inner shells (13).

6. A lightweight, short-stroke, high-thrust-density rectangular voice coil motor as described in claim 1, characterized in that, The first magnetic assembly (2) includes a first magnet A (21) and a first magnet B (22), wherein the first magnet A (21) is disposed in the upper part of the first interval and the first magnet B (22) is disposed in the lower part of the first interval.

7. A lightweight, short-stroke, high-thrust-density rectangular voice coil motor as described in claim 1, characterized in that, The second magnetic assembly (3) includes a second magnet A (31) and a second magnet B (32), wherein the second magnet A (31) is disposed in the lower part of the second interval and the second magnet B (32) is disposed in the upper part of the second interval.

8. A lightweight, short-stroke, high-thrust-density rectangular voice coil motor as described in claim 1, characterized in that, The third magnetic group (4) includes a third magnet A (41) and a third magnet B (42). The third magnet A (41) is disposed in the lower part of the third interval, and the third magnet B (42) is disposed in the upper part of the third interval.

9. A lightweight, short-stroke, high-thrust-density rectangular voice coil motor as described in claim 8, characterized in that, The magnetization directions of the first magnet A (21), the second magnet A (31), and the third magnet A (41) are consistent. The magnetization directions of the first magnet B (22), the second magnet B (32), and the third magnet B (42) are consistent. The magnetization directions of the first magnet A (21), the second magnet A (31), and the third magnet A (41) are opposite to the magnetization directions of the first magnet B (22), the second magnet B (32), and the third magnet B (42).

10. A lightweight, short-stroke, high-thrust-density rectangular voice coil motor as described in claim 5, characterized in that, The magnetization directions of the fourth magnetic group (6) and the fifth magnetic group (7) are opposite. The width of the fourth magnetic group (6) and the fifth magnetic group (7) is the same as the width of the inner shell (13). The width of one side of the coil (5) is greater than the width of the inner shell (13).

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