Electromagnetic drive device, motor and control method of electromagnetic drive device

Abstract

The application relates to the technical field of electromagnetic driving, and discloses an electromagnetic driving device, a motor and a control method of the electromagnetic driving device.The electromagnetic driving device comprises a permanent magnet, at least two magnetic cores and at least two coils; the magnetic core has a C-shaped structure; the at least two magnetic cores are oppositely arranged, the openings are opposite, and a magnetic circuit space is formed around the end of the magnetic core; the permanent magnet is arranged in the magnetic circuit space, and the permanent magnet moves in the horizontal direction in the magnetic circuit space; and the at least two coils are wound on the at least two magnetic cores respectively.The application can realize higher energy density and efficiency, and the C-shaped structure of the magnetic core enables the magnetic core to be more compactly arranged, effectively utilizes the space, and thus reduces the overall size of the device.The application can also realize accurate control of the position of the permanent magnet by adjusting the magnetization state of the magnetic core.

Description

Technical Field

[0001] This invention relates to the field of electromagnetic drive technology, and in particular to an electromagnetic drive device, a motor, and a control method for the electromagnetic drive device. Background Technology

[0002] In existing electromagnetic drive technologies, a combination of permanent magnets and electromagnetic coils is typically used to generate driving force. However, these traditional electromagnetic drive devices have some shortcomings, particularly in terms of efficiency, precise control, and device size.

[0003] First, traditional electromagnetic drive devices often employ open magnetic circuits, requiring magnetic field lines to pass through the air, resulting in energy loss and reduced drive efficiency. Second, due to limitations in the magnetic circuit design, these devices struggle to precisely control the position of the permanent magnet, affecting drive accuracy and response speed. Furthermore, to generate sufficient driving force, traditional devices often require a large size, limiting their use in space-constrained applications.

[0004] Therefore, it is urgent to propose an electromagnetic drive device, a motor, and a control method for the electromagnetic drive device to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide an electromagnetic drive device, a motor, and a control method for the electromagnetic drive device, which can achieve efficient and precise electromagnetic drive control.

[0006] To solve the above-mentioned technical problems, the present invention provides an electromagnetic drive device, comprising a permanent magnet, at least two magnetic cores, and at least two coils; The magnetic core has a C-shaped structure; at least two magnetic cores are arranged opposite each other with their openings facing each other, and a magnetic circuit space is formed around the ends of the magnetic cores; the permanent magnet is disposed in the magnetic circuit space and moves horizontally in the magnetic circuit space; at least two coils are respectively wound on at least two magnetic cores.

[0007] Furthermore, the permanent magnet has an N pole and an S pole, which are arranged in a direction perpendicular to the horizontal direction, with the N pole facing one end of the magnetic core and the S pole facing the other end of the magnetic core.

[0008] Furthermore, the magnetic circuit space is formed between the two ends of the magnetic core and between at least two of the magnetic cores; the permanent magnet is disposed within the magnetic circuit space and is located between the two ends of each magnetic core; Alternatively, magnetic blocks are provided at both ends of the magnetic core; the magnetic blocks are perpendicular to the magnetic core, and the magnetic blocks at both ends of the magnetic core are located on the same side of the magnetic core; the side of the magnetic block away from the magnetic core extends in a direction away from the magnetic core, and forms the magnetic circuit space in the extension direction, so that the permanent magnet is located outside the magnetic core.

[0009] Furthermore, when the permanent magnet is located between the two ends of the magnetic core; the two ends of one of the magnetic cores are parallel and parallel to the two ends of the other magnetic core arranged opposite to it, and a predetermined distance is maintained; one end of the permanent magnet is located between the two ends of one of the magnetic cores, and the other end is located between the two ends of the other magnetic core arranged opposite to it, and the two ends of the permanent magnet extend into the interior of the two magnetic cores arranged opposite to it.

[0010] Furthermore, it also includes an elastic fixing device for holding the permanent magnet at a predetermined position within the magnetic circuit space.

[0011] Furthermore, the at least two magnetic cores include a first magnetic core and a second magnetic core; the first magnetic core and the second magnetic core are respectively located on both sides of the permanent magnet; or, the first magnetic core and the second magnetic core are located on the same side of the permanent magnet.

[0012] Furthermore, the at least two magnetic cores include four magnetic cores; the four magnetic cores are respectively located on the four sides of the permanent magnet; or, two of the magnetic cores are located on one side of the permanent magnet, and the other two magnetic cores are located on the other side of the permanent magnet.

[0013] Furthermore, the present invention also proposes an electric motor, including the electromagnetic drive device as described above.

[0014] Furthermore, the present invention also proposes a control method for an electromagnetic drive device, which controls the electromagnetic drive device as described above, specifically including the following: Providing current to at least two coils to adjust the magnetization state of at least two magnetic cores; The permanent magnet is driven to move horizontally within the magnetic circuit space by the difference in magnetization state of the at least two magnetic cores.

[0015] Furthermore, the at least two magnetic cores include a first magnetic core and a second magnetic core. A first current is provided to the coil on the first magnetic core to increase the magnetization of the first magnetic core, and a second current is provided to the coil on the second magnetic core to decrease the magnetization of the second magnetic core, thereby causing the permanent magnet to move in a first direction. By changing the directions of the first current and the second current, the magnetization of the first magnetic core is decreased, and the magnetization of the second magnetic core is increased, thereby causing the permanent magnet to move in a second direction; wherein the first direction and the second direction are opposite directions.

[0016] Through the above technical solution, the present invention has the following beneficial effects: By employing a C-shaped magnetic core and a closed magnetic circuit setup, higher energy density and efficiency can be achieved. At the same time, the structure of the C-shaped magnetic core allows the cores to be arranged more compactly, making effective use of space and thus reducing the overall size of the device.

[0017] Furthermore, the permanent magnet moves horizontally within the magnetic circuit space, and its position can be precisely controlled by adjusting the magnetization state of the magnetic core. This control method improves the accuracy and response speed of the drive, enabling the device to respond quickly to control signals. Attached Figure Description

[0018] Figure 1 This is a front view of an electromagnetic drive device having two magnetic cores in one embodiment of the present invention; Figure 2 This is a three-dimensional structural diagram of an electromagnetic drive device with two magnetic cores in one embodiment of the present invention; Figure 3 This is a three-dimensional structural diagram of an electromagnetic drive device with two magnetic cores in another embodiment of the present invention; Figure 4 This is a three-dimensional structural diagram of an electromagnetic drive device with two magnetic cores and no coil in another embodiment of the present invention; Figure 5 This is a flowchart of a control method for an electromagnetic drive device according to an embodiment of the present invention.

[0019] In the diagram, 1 is a permanent magnet; 2 is a magnetic core; 3 is a coil; and 4 is a magnetic block. Detailed Implementation

[0020] Based on the teachings of this specification, those skilled in the art can form new technical solutions through cross-combination of different implementation methods without creating technical contradictions. Such variations should all be considered to fall within the protection scope of this invention.

[0021] The electromagnetic drive device, motor, and control method of the electromagnetic drive device according to the present invention will now be described in more detail with reference to the accompanying drawings, which illustrate preferred embodiments of the invention. It should be understood that those skilled in the art can modify the invention described herein while still achieving its advantageous effects. Therefore, the following description should be understood as being of general knowledge to those skilled in the art and is not intended to limit the invention.

[0022] The invention is described more specifically by way of example in the following paragraphs with reference to the accompanying drawings. The advantages and features of the invention will become clearer from the following description. It should be noted that the drawings are in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the invention.

[0023] like Figures 1-4 As shown, an embodiment of the present invention proposes an electromagnetic drive device, including a permanent magnet 1, at least two magnetic cores 2 and at least two coils 3.

[0024] Specifically, the magnetic core 2 has a C-shaped structure; at least two magnetic cores 2 are arranged opposite each other with their openings facing each other, and a magnetic circuit space is formed around the ends of the magnetic cores 2; the permanent magnet 1 is disposed in the magnetic circuit space and moves horizontally in the magnetic circuit space; at least two coils 3 are respectively wound on at least two magnetic cores 2.

[0025] In this embodiment, the C-shaped magnetic core 2 is made of a soft magnetic material, such as silicon steel sheet, iron-nickel alloy, or ferrite material. The C-shaped structure gives the magnetic core 2 two ends, forming an opening between them. When two C-shaped magnetic cores 2 are arranged opposite each other, their openings face each other, forming a magnetic circuit space. Within this magnetic circuit space, there is a gap between the two ends of the magnetic core 2, and there is also a gap between the two magnetic cores 2. These gaps allow the permanent magnet 1 to move freely within it. This structural arrangement, through the cooperation of the two C-shaped magnetic cores 2, can improve the magnetic field strength and the uniformity of the magnetic field distribution, making the movement of the permanent magnet 1 more controllable. Compared with the traditional linear magnetic core 2, the C-shaped structure has the advantages of a more concentrated magnetic path and a higher magnetic field strength, which can improve the efficiency and force of electromagnetic drive.

[0026] In one embodiment, the permanent magnet 1 has an N pole and a S pole (not shown in the figure), which are arranged perpendicular to the horizontal direction, with the N pole facing one end of the magnetic core 2 and the S pole facing the other end of the magnetic core 2. This polarity arrangement allows the permanent magnet 1 to generate a more stable magnetic field distribution within the magnetic circuit space, improving the driving effect. The vertically arranged N and S poles enable the permanent magnet 1 and the magnetic core 2 to form a more efficient magnetic circuit, reducing the diffusion and leakage of magnetic lines of force, thereby improving the energy conversion efficiency of the electromagnetic drive and reducing energy consumption.

[0027] In one embodiment, the permanent magnet 1 can be made of materials such as neodymium iron boron, samarium cobalt, or ferrite. Neodymium iron boron magnets have the highest magnetic energy product and are suitable for applications requiring high driving force; samarium cobalt magnets have good temperature stability and are suitable for high-temperature environments; ferrite magnets are low-cost and suitable for general applications. The shape of the permanent magnet 1 can be a cuboid, cylinder, or other shape suitable for movement within the magnetic circuit space. The size of the permanent magnet 1 can depend on the application requirements and the size of the magnetic core 2. The arrangement of the N and S poles allows the permanent magnet 1 to form a more effective magnetic field interaction with the magnetic core 2, enhancing the driving force. Smaller permanent magnets 1 have faster response times and are suitable for high-frequency applications; larger permanent magnets 1 provide greater driving force and are suitable for applications requiring high torque.

[0028] Preferably, this embodiment further includes an elastic fixing device (not shown in the figure) for holding the permanent magnet 1 at a predetermined position within the magnetic circuit space. The elastic fixing device may be made of a spring, elastic rubber, or other elastic material, and is connected between the permanent magnet 1 and the magnetic core 2 or between the permanent magnet 1 and an external fixing structure. The spring constant depends on the mass of the permanent magnet 1 and the expected range of motion.

[0029] The elastic fixing device in this embodiment enhances the positional stability of the permanent magnet 1 in the power-off state and provides appropriate restoring force in the power-on state, enabling the permanent magnet 1 to return to its predetermined position after the power is turned off. Furthermore, the elastic fixing device can absorb vibration, reduce noise, extend the service life of the device, and improve the overall system reliability and durability.

[0030] In one embodiment, such as Figures 1-4 As shown, the magnetic circuit space is formed between the two ends of the magnetic core 2 and between at least two magnetic cores 2; the permanent magnet 1 is disposed in the magnetic circuit space and is located between the two ends of each magnetic core 2.

[0031] More specifically, when the permanent magnet 1 is located between the two ends of the magnetic core 2; continue to refer to Figure 1 and Figure 2 As shown, the two ends of one of the magnetic cores 2 are parallel and are parallel to the two ends of the other magnetic core 2 arranged opposite to each other, while maintaining a predetermined distance; one end of the permanent magnet 1 is located between the two ends of one of the magnetic cores 2, and the other end is located between the two ends of the other magnetic core 2 arranged opposite to each other, and the two ends of the permanent magnet 1 extend into the interior of the two magnetic cores 2 arranged opposite to each other.

[0032] In this embodiment, the predetermined distance between the two ends of the magnetic core 2 can be determined based on the size of the permanent magnet 1 and the expected range of motion. The width of the ends of the magnetic core 2 can be set according to actual needs, and the thickness of the ends is consistent with the body of the magnetic core 2. Typically, this distance is slightly larger than the corresponding size of the permanent magnet 1 so that the permanent magnet 1 can move freely without physical obstruction. The arrangement of the permanent magnet 1 extending into the interior of the magnetic core 2 can enhance the magnetic field coupling between the permanent magnet 1 and the magnetic core 2, improving the driving force and response speed. The depth to which the permanent magnet 1 extends into the interior of the magnetic core 2 can be set according to actual conditions. This arrangement can increase the magnetic flux, improve the energy conversion efficiency, and enable a greater driving force to be generated under the same current.

[0033] In another embodiment, continue to refer to Figure 3 and Figure 4 As shown, magnetic blocks 4 are provided at both ends of the magnetic core 2; the magnetic blocks 4 are perpendicular to the magnetic core 2, and the magnetic blocks 4 at both ends of the magnetic core 2 are located on the same side of the magnetic core 2; the side of the magnetic block 4 away from the magnetic core 2 extends in a direction away from the magnetic core 2, forming the magnetic circuit space in the extending direction, so that the permanent magnet 1 is located outside the magnetic core 2. Since the volume of the magnetic core 2 and the permanent magnet 1 may be small during actual installation, installing the permanent magnet 1 inside the two magnetic cores 2 may result in limited operating space and inconvenient installation. Therefore, in this embodiment, the permanent magnet 1 can be installed on the outside of the magnetic core 2, thus eliminating the need to install the permanent magnet 1 between the two open ends of the magnetic core 2, making installation more convenient and simpler, providing another installation option, and expanding the applicability of this device.

[0034] The material of magnetic block 4 can be the same as that of the magnetic core.

[0035] In the first embodiment, reference continues Figures 1-4 As shown, the at least two magnetic cores 2 include a first magnetic core and a second magnetic core.

[0036] In a specific example, continue to refer to Figure 1 and Figure 2 As shown, the first and second magnetic cores are located on opposite sides of the permanent magnet 1. This arrangement allows the permanent magnet 1 to move horizontally between the first and second magnetic cores, improving the stability and controllability of the motion. The symmetrical arrangement of the magnetic cores 2 on both sides generates a more balanced magnetic field, reducing the offset of the permanent magnet 1 in the non-motion direction and improving the linearity and repeatability of the motion.

[0037] For example, continue to refer to Figure 1 and Figure 2As shown, the first and second magnetic cores can be arranged symmetrically. When symmetrically arranged, the distance between the two magnetic cores 2 depends on the size of the permanent magnet 1 and the expected range of motion. When the first and second magnetic cores are symmetrically arranged, the magnetic forces acting on the permanent magnet 1 on both sides are more balanced, resulting in more stable motion.

[0038] In another specific example, continue to refer to Figure 3 and Figure 4 As shown, the first magnetic core and the second magnetic core are located on the same side of the permanent magnet 1.

[0039] In the second embodiment, the at least two magnetic cores 2 include four magnetic cores 2 (not shown in the figure).

[0040] In a specific example, the four magnetic cores 2 are located on the four sides (e.g., the left and right sides and the front and back sides) of the permanent magnet 1. The four magnetic cores 2 can be labeled as the first magnetic core, the second magnetic core, the third magnetic core, and the fourth magnetic core, respectively, forming a closed magnetic circuit space around the permanent magnet 1. The four magnetic cores 2 can be arranged in a square or a rectangular layout. This four-sided layout enhances the uniformity and stability of the magnetic field, improving the performance of the driving device. The four-sided layout also enables two-dimensional motion of the permanent magnet 1 within a plane, greatly expanding the application range of the device and making it suitable for applications requiring complex motion control.

[0041] Specifically, the four magnetic cores 2 can be arranged in a square or rectangle on a horizontal plane, with the permanent magnet 1 located at the center. Each magnetic core 2 is wound with a coil 3. By controlling the direction and magnitude of the current in different coils 3, multi-directional movement of the permanent magnet 1 within the horizontal plane can be achieved, increasing the flexibility and functionality of the device. A square arrangement is suitable for applications requiring uniform two-dimensional motion, while a rectangular arrangement is suitable for applications requiring a larger range of motion in a specific direction. This multi-directional control capability allows the device to be applied in high-end applications such as optical lens image stabilization, precision positioning systems, and complex motion control.

[0042] In another specific example, two of the magnetic cores 2 are located on one side of the permanent magnet 1, and the other two magnetic cores 2 are located on the other side of the permanent magnet 1. For example, the four magnetic cores 2 can be labeled as the first magnetic core, the second magnetic core, the third magnetic core, and the fourth magnetic core, respectively. The openings of the first and second magnetic cores are arranged opposite each other, and the openings of the third and fourth magnetic cores are arranged opposite each other. The first and third magnetic cores are arranged parallel to each other with a predetermined interval, and the second and fourth magnetic cores are arranged parallel to each other with the same predetermined interval. The first and second magnetic cores are located on one side of the permanent magnet 1, and the third and fourth magnetic cores are located on the other side of the permanent magnet 1. Furthermore, the magnetic blocks 4 on the first and second magnetic cores extend towards the permanent magnet 1, and the magnetic blocks 4 on the third and fourth magnetic cores also extend towards the permanent magnet 1.

[0043] In one embodiment, the number of coils 3 corresponds to the number of magnetic cores 2. Each magnetic core 2 has one coil 3 wound around it. The coil 3 is typically made of insulated copper wire, and the winding method can be single-layer or multi-layer. The number of turns can be determined according to the required magnetic field strength and the size of the driving device. The coil 3 on each magnetic core 2 is independently controlled, enabling the system to achieve more flexible and precise motion control of the permanent magnet 1, thereby improving the system's adaptability and performance.

[0044] Preferably, the magnetic core 2 in this embodiment can be a miniature C-shaped magnetic core. Specifically, the size of the magnetic core 2 is limited to a certain range; for example, the thickness of each magnetic core 2 can be 1mm to 5mm, the width can be 5mm to 10mm, and the length can be 10mm to 20mm. The permanent magnet 1 is placed within the magnetic circuit space formed by the magnetic core 2, and its size is also correspondingly limited to a miniature range; for example, the diameter of the permanent magnet 1 can be 2mm to 4mm, and the length can be 5mm to 10mm.

[0045] By supplying current to coil 3, the magnetization state of magnetic core 2 can be adjusted, thereby changing the magnetic force on permanent magnet 1. When the magnetization of one magnetic core 2 increases while the magnetization of the other magnetic core 2 decreases, permanent magnet 1 will move horizontally from one magnetic core 2 to the other. Changing the direction of the current can cause permanent magnet 1 to move in the opposite direction.

[0046] In this embodiment, the size of coil 3 has also been optimized to accommodate the structure of a miniature C-shaped magnetic core. For example, the diameter of coil 3 can be 3mm to 6mm, and the number of turns of coil 3 can be adjusted according to the required magnetization intensity. As those skilled in the art will know, the number of turns and current of coil 3 can be set according to actual needs, and other embodiments besides this one are also included.

[0047] Therefore, this embodiment enables the permanent magnet 1 to move precisely left and right within the magnetic circuit space, thereby achieving electromagnetic drive. By controlling the magnitude and direction of the current, the position of the permanent magnet 1 can be precisely controlled, thereby improving the accuracy and response speed of the drive. The closed magnetic circuit configuration can improve energy density and efficiency while reducing the overall size of the device, making this device suitable for space-constrained applications.

[0048] Furthermore, this embodiment also proposes a motor (not shown in the figure for simplicity), including the electromagnetic drive device as described above. Other parts of the motor may include a housing, control circuitry, and sensors, etc., to cooperate with the operation of the electromagnetic drive device. In a specific example, the motor may employ a closed-loop control system, which detects the position and velocity of the permanent magnet 1 through sensors, and then adjusts the current in the coil to achieve precise control of the movement of the permanent magnet 1.

[0049] In addition, such as Figure 3 As shown, this embodiment also proposes a control method for an electromagnetic drive device, which controls the electromagnetic drive device as described above, specifically including the following steps: S1. Provide current to at least two coils 3 to adjust the magnetization state of at least two magnetic cores 2; S2. By utilizing the difference in magnetization states of the at least two magnetic cores 2, the permanent magnet 1 is driven to move along the horizontal direction within the magnetic circuit space.

[0050] In one embodiment, the at least two magnetic cores 2 include a first magnetic core and a second magnetic core. A first current is provided to a coil 3 on the first magnetic core, increasing the magnetization of the first magnetic core; a second current is provided to a coil 3 on the second magnetic core, decreasing the magnetization of the second magnetic core. This causes the permanent magnet 1 to move in a first direction, for example, from left to right in the horizontal direction. By changing the directions of the first and second currents, the magnetization of the first magnetic core is decreased, and the magnetization of the second magnetic core is increased, causing the permanent magnet 1 to move in a second direction, for example, from right to left in the horizontal direction. The first and second directions are opposite. This embodiment, by changing the directions of the first and second currents, makes the changes in the magnetization of the first magnetic core and the second magnetic core have opposite trends, thus causing the permanent magnet 1 to move left and right in the horizontal direction. This control method can improve the flexibility and accuracy of the drive.

[0051] In this embodiment, the electromagnetic drive device utilizes at least two C-shaped magnetic cores 2 and coils 3 wound around them to generate a controllable magnetic field. A permanent magnet 1 is placed within the magnetic circuit space formed by the magnetic cores 2, with its N and S poles arranged perpendicular to the horizontal direction of movement. By supplying current to the coils 3, the magnetization state of the magnetic cores 2 can be adjusted, thereby changing the magnetic force on the permanent magnet 1. When the magnetization intensity of one magnetic core 2 increases while the magnetization intensity of the other magnetic core 2 decreases, the permanent magnet 1 will move horizontally from one magnetic core 2 to the other. Changing the direction of the current can reverse the movement of the permanent magnet 1. Therefore, this embodiment enables the permanent magnet 1 to move precisely within the magnetic circuit space, thereby achieving electromagnetic drive. By controlling the magnitude and direction of the current, the position of the permanent magnet 1 can be precisely controlled, thereby improving the accuracy and response speed of the drive. The closed magnetic circuit configuration can improve energy density and efficiency while reducing the overall size of the device.

[0052] In summary, the electromagnetic drive device, motor, and control method for the electromagnetic drive device proposed in this invention have the following advantages: By employing a C-shaped magnetic core and a closed magnetic circuit setup, higher energy density and efficiency can be achieved. At the same time, the structure of the C-shaped magnetic core allows the cores to be arranged more compactly, making effective use of space and thus reducing the overall size of the device.

[0053] Furthermore, the permanent magnet moves horizontally within the magnetic circuit space, and its position can be precisely controlled by adjusting the magnetization state of the magnetic core. This control method improves the accuracy and response speed of the drive, enabling the device to respond quickly to control signals.

[0054] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. An electromagnetic drive device, characterized in that, It includes a permanent magnet, at least two magnetic cores, and at least two coils; The magnetic core has a C-shaped structure; at least two magnetic cores are arranged opposite each other with their openings facing each other, and a magnetic circuit space is formed around the ends of the magnetic cores; the permanent magnet is disposed in the magnetic circuit space and moves horizontally in the magnetic circuit space; at least two coils are respectively wound on at least two magnetic cores.

2. The electromagnetic drive device as described in claim 1, characterized in that, The permanent magnet has an N pole and an S pole, which are arranged in a direction perpendicular to the horizontal direction, with the N pole facing one end of the magnetic core and the S pole facing the other end of the magnetic core.

3. The electromagnetic drive device as described in claim 1, characterized in that, The magnetic circuit space is formed between the two ends of the magnetic core and between at least two of the magnetic cores; the permanent magnet is disposed within the magnetic circuit space and is located between the two ends of each magnetic core; Alternatively, magnetic blocks are provided at both ends of the magnetic core; the magnetic blocks are perpendicular to the magnetic core, and the magnetic blocks at both ends of the magnetic core are located on the same side of the magnetic core; the side of the magnetic block away from the magnetic core extends in a direction away from the magnetic core, and forms the magnetic circuit space in the extension direction, so that the permanent magnet is located outside the magnetic core.

4. The electromagnetic drive device as described in claim 3, characterized in that, When the permanent magnet is located between the two ends of the magnetic core; the two ends of one of the magnetic cores are parallel and parallel to the two ends of the other magnetic core arranged opposite to each other, and a predetermined distance is maintained; one end of the permanent magnet is located between the two ends of one of the magnetic cores, and the other end is located between the two ends of the other magnetic core arranged opposite to each other, and the two ends of the permanent magnet extend into the interior of the two magnetic cores arranged opposite to each other.

5. The electromagnetic drive device as described in claim 1, characterized in that, It also includes a flexible fixing device for holding the permanent magnet at a predetermined position within the magnetic circuit space.

6. The electromagnetic drive device as described in claim 1, characterized in that, The at least two magnetic cores include a first magnetic core and a second magnetic core; the first magnetic core and the second magnetic core are respectively located on both sides of the permanent magnet; or, the first magnetic core and the second magnetic core are located on the same side of the permanent magnet.

7. The electromagnetic drive device as described in claim 1, characterized in that, The at least two magnetic cores include four magnetic cores; the four magnetic cores are respectively located on the four sides of the permanent magnet; or, two of the magnetic cores are located on one side of the permanent magnet, and the other two magnetic cores are located on the other side of the permanent magnet.

8. An electric motor, characterized in that, Includes the electromagnetic drive device as described in any one of claims 1-7.

9. A control method for an electromagnetic drive device, controlling the electromagnetic drive device as described in any one of claims 1-7, characterized in that, Specifically, it includes the following: Providing current to at least two coils to adjust the magnetization state of at least two magnetic cores; The permanent magnet is driven to move horizontally within the magnetic circuit space by the difference in magnetization state of the at least two magnetic cores.

10. The control method for the electromagnetic drive device as described in claim 9, characterized in that, The at least two magnetic cores include a first magnetic core and a second magnetic core. A first current is provided to the coil on the first magnetic core to increase the magnetization of the first magnetic core, and a second current is provided to the coil on the second magnetic core to decrease the magnetization of the second magnetic core, thereby causing the permanent magnet to move in the first direction. By changing the directions of the first current and the second current, the magnetization of the first magnetic core is weakened and the magnetization of the second magnetic core is strengthened, thereby causing the permanent magnet to move in the second direction; wherein the first direction and the second direction are opposite directions.

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