Moving coil composite linear motor active suspension based on Halbech array

Abstract

The present invention discloses a Halbech array-based dynamic-coil composite linear motor active suspension, comprising a connected rotating device and a vibration damping device. The interior of the rotating device's housing is slidably connected to a roller rack via rollers, and the inner wall of the roller rack is sleeved with a guide rail post via rollers. The guide rail post has a boss-shaped internal cavity filled with paraffin wax, and the portion of the roller rack inserted into the guide rail post cavity is connected to a heating wire. An end cap is disposed at the opening of the housing and is fixedly connected to the housing. The outer yoke of the vibration damping device is disposed on the vehicle frame, and the stator extends through the outer yoke. The mover is located inside the stator, wrapped with a coil, one end of the mover is fixedly connected to a connecting rod, and the other end of the mover is fixedly connected to the stator via a spring. Round holes are evenly distributed on the outer yoke. The present invention combines the advantages of active suspension's fast response and good vibration damping effect with passive suspension's low energy consumption.

Description

Technical Field

[0001] The present invention relates to the technical field of composite linear motors, and in particular to a Halbech array-based moving-coil composite linear motor active suspension. Background Art

[0002] With the advancement and development of the automotive industry, vehicles have not only achieved significant improvements in speed, energy consumption, and appearance, but also have higher demands for smoother and more comfortable driving. Traditional passive suspension, while low-cost, suffers from slow response and poor vibration damping on rough roads, failing to meet the requirements for improved passenger comfort.

[0003] As an electronically controlled active suspension, linear motors offer improved vibration damping performance. Electromagnetic linear active suspension boasts compact structure and fast response. Because it is electronically controlled, its vibration damping performance is significantly superior to that of traditional passive suspension. However, the actuator's electromagnetic force density is low, requiring significant energy to dampen the impact of uneven road surfaces, resulting in high costs. Summary of the Invention

[0004] In response to the problems existing in the prior art, the present invention provides a moving coil composite linear motor active suspension based on a Halbech array, which combines the advantages of fast response and good vibration reduction of active suspension with low energy consumption of passive suspension.

[0005] To achieve the above technical objectives, the present invention adopts the following technical solution: a moving coil composite linear motor active suspension based on a Halbech array, comprising a connected rotating device and a vibration reduction device.

[0006] Furthermore, the rotating device is composed of a guide rail column, a roller rack, a roller, an outer shell, paraffin, a heating wire and an end cover. The interior of the outer shell is slidably connected to the roller rack through a roller, and the inner wall of the roller rack is sleeved with the guide rail column through a roller; the internal cavity of the guide rail column is in a boss shape, the internal cavity of the guide rail column is filled with paraffin, and the part of the roller rack inserted into the guide rail column cavity is connected to the heating wire; the end cover is arranged at the opening of the outer shell, and the end cover is fixedly connected to the outer shell.

[0007] Furthermore, the roller is composed of a first cylinder, a second cylinder, and a third cylinder with successively decreasing radii, one end of the first cylinder is connected to one end of the second cylinder, and one end of the third cylinder is connected to the other end of the second cylinder.

[0008] Furthermore, two linear guide rails are symmetrically provided on the inside of the shell, and the other end of the first cylinder in the roller is slidably connected to the linear guide rail; two small holes are symmetrically provided on the side wall of the roller frame, and the second cylinder in the roller passes through the small holes; two helical guide rails with a pitch of 100 mm are symmetrically provided on the outer wall of the guide rail column, and the other end of the third cylinder in the roller is slidably connected to the helical guide rail; a limit block is provided at the end of the helical guide rail close to the vibration damping device.

[0009] Furthermore, the rolling frame includes: a chassis, a hexagonal bolt, a hollow cylindrical tube, a support column and a wire. The chassis and the hollow cylindrical tube are fixedly connected by the hexagonal bolt. The support column is arranged at the center of the chassis, and a wire is arranged inside the support column.

[0010] Furthermore, the support column is inserted into the boss-shaped cavity of the guide rail column, and a heating wire is provided on the support column, and the heating wire is connected to one end of the wire.

[0011] Furthermore, two small holes are symmetrically provided on the side wall of the hollow cylindrical tube, and the second cylinder in the roller passes through the small holes.

[0012] Furthermore, the vibration reduction device includes: a stator, a mover, an outer magnetic yoke, a spring, a connecting rod and a coil. The outer magnetic yoke is arranged on the frame, and the stator passes through the outer magnetic yoke; the mover is located inside the stator, and the coil is wrapped on the mover. One end of the mover is fixedly connected to the connecting rod, and the other end of the mover is fixedly connected to the stator through a spring; circular holes are evenly distributed on the outer magnetic yoke.

[0013] Furthermore, the stator includes: a front end cover, a permanent magnet, an inner magnetic yoke and a rear end cover, wherein the front end cover, the inner magnetic yoke and the rear end cover are fixedly connected in sequence, the permanent magnet is composed of a plurality of permanent magnet units arranged in a ring-shaped Halbech array, the permanent magnet is arranged in the inner magnetic yoke, and the permanent magnet is fixedly connected to the inner magnetic yoke; the inner magnetic yoke is evenly distributed with circular holes corresponding to the outer magnetic yoke; and a mover is provided inside the permanent magnet.

[0014] Furthermore, the front end cover is fixedly connected to the guide rail column.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention's Halbech array-based dynamic-coil composite linear motor active suspension differs from conventional active suspensions in that conventional active suspensions require constant high-density magnetic fields to output sufficient impedance for vibration reduction. While this can achieve good vibration reduction characteristics, the induced current generated by the movement of the mover is large, resulting in increased copper and iron losses in the motor, thus shortening the motor's service life. To improve this shortcoming and extend the motor's service life without affecting its vibration resistance, the present invention provides a rotating device on the vibration reduction device, changes the degree of hole overlap between the inner and outer magnetic yokes, and modifies the size of the magnetic induction lines to reduce iron and copper losses, thereby lowering the motor's magnetic density under specific operating conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A three-dimensional perspective view of the active suspension of a moving coil type composite linear motor based on a Halbech array according to the present invention;

[0017] Figure 2 A cross-sectional view of the overall arrangement of the active suspension of a moving coil type composite linear motor based on a Halbech array according to the present invention;

[0018] Figure 3 It is a structural schematic diagram of the rotating device in the present invention;

[0019] Figure 4 Schematic diagram of the structure of the vibration reduction device in the present invention;

[0020] Among them, 1-rotating device, 1.1-guide rail column, 1.2-roller, 1.2.1-chassis, 1.2.2-hexagonal bolt, 1.2.3-hollow cylinder, 1.2.4-support column, 1.3-roller, 1.4-housing, 1.5-paraffin, 1.6-heating wire, 1.7-limit block, 1.8-end cover, 2-vibration damping device, 2.1-stator, 2.1.1-front cover, 2.1.2-permanent magnet, 2.1.3-inner yoke, 2.1.4-rear cover, 2.2-mover, 2.3-outer yoke, 2.4-spring, 2.5-connecting rod, 2.6-coil. DETAILED DESCRIPTION

[0021] The technical solution of the present invention will be further explained below with reference to the accompanying drawings.

[0022] like Figure 1-2The present invention provides a dynamic-coil composite linear motor active suspension based on a Halbech array, comprising a connected rotating device 1 and a vibration-damping device 2. The linear motion of the roller rack inside the rotating device 1 drives the guide rail column to rotate, causing the inner magnetic yoke in the vibration-damping device 2 connected to the guide rail column to also rotate, thereby changing the degree of overlap between the holes of the inner and outer magnetic yokes, changing the size of the magnetic induction lines, achieving flexible adjustment of the magnetic field strength, and reducing iron loss and copper loss; at the same time, the vibration-damping device 2 is responsible for outputting impedance to ensure the vibration-damping performance of the structure.

[0023] like Figure 3 The rotating device 1 of the present invention is composed of a guide column 1.1, a roller frame 1.2, a roller 1.3, a housing 1.4, paraffin wax 1.5, a heating wire 1.6, and an end cap 1.8. The interior of the housing 1.4 is slidably connected to the roller frame 1.2 via the roller 1.3. The inner wall of the roller frame 1.2 is sleeved with the guide column 1.1 via the roller 1.3. Specifically, the roller 1.3 is composed of a first cylinder, a second cylinder, and a third cylinder with successively decreasing radii. One end of the first cylinder is connected to one end of the second cylinder, and one end of the third cylinder is connected to the other end of the second cylinder. The housing 1.4 is connected to the roller frame 1.2 via the roller 1.3. Two linear guides are symmetrically arranged on the interior of 4, and the other end of the first cylinder in roller 1.3 is slidably connected to the linear guides; two small holes are symmetrically arranged on the side wall of the roller frame 1.2, and the second cylinder in roller 1.3 passes through the small holes; two helical guides with a pitch of 100mm are symmetrically arranged on the outer wall of the guide column 1.1, and the other end of the third cylinder in roller 1.3 is slidably connected to the helical guides. Under the constraints of these guides, the roller frame 1.2 can only perform linear motion, and the guide column 1.1 can only perform rotational motion, avoiding the need to arrange a motor to complete the rotational motion, saving space and cost. At the same time, a limit block 1.7 is provided at the end of the helical guide near the side of the vibration reduction device 2 to ensure that the guide column 1.1 is constrained to perform only rotational motion in this position. The internal cavity of the guide column 1.1 is in the shape of a boss. The boss-shaped structure can ensure that the direction of the output force after the internal pressure changes is always in the direction of the movement of the roller frame 1.2, thereby increasing the stroke change caused by the expansion of the paraffin 1.5 and amplifying the rotation angle of the guide column 1.1. The internal cavity of the guide rail post 1.1 is filled with paraffin wax 1.5. The portion of the roller 1.2 inserted into the cavity of the guide rail post 1.1 is connected to a heating wire 1.6. The heating wire 1.6 melts the paraffin wax 1.5, and the expanded volume of the melted paraffin wax 1.5 propels the roller 1.2 in a linear motion, thereby driving the rotation of the guide rail post 1.1. The expanded paraffin wax 1.5 provides power for the rotating device 1. An end cap 1.8 is disposed at the opening of the outer shell 1.4 and is fixedly connected to the outer shell 1.4.

[0024] In one technical solution of the present invention, a roller frame 1.2 comprises a chassis 1.2.1, hexagonal bolts 1.2.2, a hollow cylindrical tube 1.2.3, a support column 1.2.4, and a wire 1.2.5. The chassis 1.2.1 and the hollow cylindrical tube 1.2.3 are fixedly connected by the hexagonal bolts 1.2.2. The support column 1.2.4 is positioned at the center of the chassis 1.2.1, and the wire 1.2.5 is positioned within the support column 1.2.4. The support column 1.2.4 is inserted into the boss-shaped cavity of the guide rail column 1.1, and a heating wire 1.6 is mounted on the support column 1.2.4, which is connected to one end of the wire 1.2.5. Two small holes are symmetrically defined on the sidewall of the hollow cylindrical tube 1.2.3, through which the second cylinder of the roller 1.3 extends. The metal construction of the roller frame 1.2 ensures rapid heat dissipation and reduces the response time during cooling and reset.

[0025] like Figure 4 The vibration reduction device in the present invention includes: a stator 2.1, a mover 2.2, an outer magnetic yoke 2.3, a spring 2.4, a connecting rod 2.5 and a coil 2.6. The outer magnetic yoke 2.3 is arranged on the frame, and the stator 2.1 passes through the outer magnetic yoke 2.3; the mover 2.2 is located inside the stator 2.1, and the coil 2.6 is wrapped around the mover 2.2, which provides an anti-vibration electric field force after power is turned on. One end of the mover 2.2 is fixedly connected to the connecting rod 2.5 to receive the vibration generated by the ground. The other end of the mover 2.2 is fixedly connected to the stator 2.1 through the spring 2.4. The spring 2.4 can absorb a large amount of vibration when the vibration is severe; circular holes are evenly distributed on the outer magnetic yoke 2.3.

[0026] Stator 2.1 comprises a front cover 2.1.1, permanent magnets 2.1.2, an inner yoke 2.1.3, and a rear cover 2.1.4. Front cover 2.1.1 is fixedly connected to guide rail post 1.1. These, in turn, are then fixedly connected. Permanent magnets 2.1.2 consist of multiple permanent magnet units arranged in a Halbech array. This multi-directional magnetization scheme optimizes the magnetic flux distribution by inserting radially magnetized permanent magnets between the staggered axially magnetized permanent magnets in the coils. This enhances the magnetic flux density in key areas, increasing the output of the working section and enabling greater force output from coil 2.6. The individual permanent magnet units are sealed and pressed together with epoxy resin to prevent them from dispersing during use due to internal magnetic forces and external vibrations. Permanent magnet 2.1.2 is mounted within inner yoke 2.1.3 and fixedly connected to it. Circular holes are evenly distributed on inner yoke 2.1.2, corresponding to outer yoke 2.5. A mover 2.2 is located within permanent magnet 2.4. When energized, mover 2.2 generates a resistance force that hinders vibration in the magnetic field generated by the surrounding permanent magnet 2.1.2. By rotating device 1 through a certain angle, the holes in inner yoke 2.1.3 and the circular holes in outer yoke 2.5 coincide, altering the arrangement of the Halbech array's magnetic flux lines. This changes the magnetic flux applied by permanent magnet 2.1.2 to coil 2.6, providing the actuator with varying resistance forces for different road conditions. This resistance force is composed of the elastic force output by spring 2.4 and the electromagnetic force output by mover 2.2.

[0027] When road conditions are poor, spring 2.4 is under significant pressure, generating a high elastic force. This weakens the magnetic force and reduces motor losses. Specifically, the connecting rod 2.5 senses intense vibration, and the movement of coil 2.6 generates some resistance, while the remaining vibration is mostly absorbed by spring 2.4. At this time, coil 2.6 moves violently, generating a strong eddy current effect, which can appropriately reduce the surrounding magnetic flux density, thereby reducing copper and iron losses. Therefore, under these operating conditions, the heating wire 1.6 on the roller 1.2 is energized via an electrical wire. This heats the wax 1.5 inside the guide rail post 1.1, causing it to expand and push the roller 1.2. When the roller 1.2 reaches its corresponding position, the holes on the inner and outer magnetic yokes align, changing the distribution of the magnetic flux lines of the permanent magnets 2.1.2. This reduces the magnetic flux density of the actuator coil output by this array. Furthermore, the higher elastic force generated by the pressure on spring 2.4 compensates for the resistance caused by the reduced magnetic flux, thereby reducing motor losses.

[0028] When road conditions are favorable, spring 2.4 is under low pressure and its output is weak, so the magnetic force must be increased to boost the electromagnetic force output by coil 2.6. Specifically, when slight vibrations are sensed through connecting rod 2.5, spring 2.4 is under low pressure, producing insufficient impedance. Coil 2.6 moves smoothly, resulting in minimal eddy currents, low copper and iron losses, and a weak electric field. Therefore, its magnetic flux density should be increased to ensure vibration resistance. Therefore, under these conditions, coil 2.6 is designed to output a greater impedance with a faster response time to ensure vibration resistance. At this point, the inner and outer yokes block each other's holes, resulting in a high magnetic flux density output by the array, ensuring strong impedance even with minimal movement.

[0029] The present invention provides a Halbech array-based moving-coil composite linear motor active suspension that increases the motor's service life without affecting its anti-vibration performance. By providing a rotating device 1 on a vibration reduction device 2, the degree of hole overlap between the inner and outer magnetic yokes is changed, thereby changing the size of the magnetic induction lines to reduce iron loss and copper loss, thereby reducing the motor's magnetic density under specific working conditions.

[0030] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions based on the principles of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, various improvements and modifications that do not depart from the principles of the present invention should be considered within the scope of protection of the present invention.

Claims

1. A dynamic composite linear motor active suspension based on a Halbech array, characterized in that: It includes a connected rotating device (1) and a vibration reduction device (2); The rotating device (1) is composed of a guide rail column (1.1), a roller frame (1.2), a roller (1.3), a shell (1.4), paraffin wax (1.5), a heating wire (1.6) and an end cover (1.8); the interior of the shell (1.4) is slidably connected to the roller frame (1.2) via the roller (1.3); the inner wall of the roller frame (1.2) is sleeved with the guide rail column (1.1) via the roller (1.3); the internal cavity of the guide rail column (1.1) is in a boss shape; the internal cavity of the guide rail column (1.1) is filled with paraffin wax (1.5); the portion of the roller frame (1.2) inserted into the cavity of the guide rail column (1.1) is connected to the heating wire (1.6); the end cover (1.8) is arranged at the opening of the shell (1.4), and the end cover (1.8) is fixedly connected to the shell (1.4); The vibration damping device comprises: a stator (2.1), a mover (2.2), an outer magnetic yoke (2.3), a spring (2.4), a connecting rod (2.5) and a coil (2.6); the outer magnetic yoke (2.3) is arranged on a vehicle frame, and the stator (2.1) passes through the outer magnetic yoke (2.3); the mover (2.2) is located inside the stator (2.1), and the coil (2.6) is wrapped around the mover (2.2); one end of the mover (2.2) is fixedly connected to the connecting rod (2.5), and the other end of the mover (2.2) is fixedly connected to the stator (2.1) via the spring (2.4); and circular holes are evenly distributed on the outer magnetic yoke (2.3); The stator (2.1) comprises: a front end cover (2.1.1), a permanent magnet (2.1.2), an inner magnetic yoke (2.1.3) and a rear end cover (2.1.4); the front end cover (2.1.1), the inner magnetic yoke (2.1.3) and the rear end cover (2.1.4) are fixedly connected in sequence; the front end cover (2.1.1) is fixedly connected to the guide rail column (1.1); the permanent magnet (2.1.2) is composed of a plurality of permanent magnet units arranged in a ring-shaped Halbech array; the permanent magnet (2.1.2) is arranged in the inner magnetic yoke (2.1.3), and the permanent magnet (2.1.2) is fixedly connected to the inner magnetic yoke (2.1.3); circular holes corresponding to the outer magnetic yoke (2.5) are evenly distributed on the inner magnetic yoke (2.1.2); and a mover (2.2) is provided inside the permanent magnet (2.1.2).

2. The Halbech array-based moving coil composite linear motor active suspension according to claim 1, characterized in that: The roller (1.3) is composed of a first cylinder, a second cylinder, and a third cylinder with successively decreasing radii; one end of the first cylinder is connected to one end of the second cylinder; and one end of the third cylinder is connected to the other end of the second cylinder.

3. The Halbech array-based moving coil composite linear motor active suspension according to claim 2, characterized in that: Two linear guide rails are symmetrically provided on the interior of the housing (1.4), and the other end of the first cylinder in the roller (1.3) is slidably connected to the linear guide rails; two small holes are symmetrically provided on the side wall of the roller frame (1.2), and the second cylinder in the roller (1.3) passes through the small holes; two helical guide rails with a pitch of 100 mm are symmetrically provided on the outer wall of the guide rail column (1.1), and the other end of the third cylinder in the roller (1.3) is slidably connected to the helical guide rails; a limit block (1.7) is provided at the end of the helical guide rail close to the vibration damping device (2).

4. The Halbech array-based moving coil composite linear motor active suspension according to claim 1, characterized in that: The rolling frame (1.2) comprises: a chassis (1.2.1), a hexagonal bolt (1.2.2), a hollow cylindrical tube (1.2.3), a support column (1.2.4) and a wire (1.2.5); the chassis (1.2.1) and the hollow cylindrical tube (1.2.3) are fixedly connected via the hexagonal bolt (1.2.2); the support column (1.2.4) is arranged at the center of the chassis (1.2.1); and the wire (1.2.5) is arranged inside the support column (1.2.4).

5. The Halbech array-based moving coil composite linear motor active suspension according to claim 4, characterized in that: The support column (1.2.4) is inserted into the boss-shaped cavity of the guide rail column (1.1); a heating wire (1.6) is provided on the support column (1.2.4); and the heating wire (1.6) is connected to one end of a wire (1.2.5).

6. The Halbech array-based moving coil composite linear motor active suspension according to claim 4, characterized in that: Two small holes are symmetrically provided on the side wall of the hollow cylindrical tube (1.2.3), and the second cylinder in the roller (1.3) passes through the small holes.

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