A permanent magnet eddy current coupling

Abstract

A permanent magnet eddy current coupling belongs to the field of magnetic transmission, and specifically relates to the field of permanent magnet eddy current coupling. The present invention solves the problems of small torque transmission capacity and limited installation of existing permanent magnet eddy current couplings. It includes a conductor unit and a permanent magnet unit, the conductor unit and the permanent magnet unit are coaxially arranged with an air gap in the middle; the conductor unit includes a conductor back iron disk and a conductor disk; the permanent magnet unit includes a permanent magnet, a permanent magnet back iron disk and a permanent magnet mounting disk; the conductor disk is coaxially connected to the back iron disk, and the conductor disk is located on the air gap side; the permanent magnet mounting disk and the permanent magnet back iron disk are coaxially connected, and the permanent magnet mounting disk is located on the air gap side; the permanent magnets are arranged at equal intervals along the circumference of the permanent magnet mounting disk; the permanent magnets include inner arc permanent magnets and outer arc permanent magnets, the inner arc permanent magnets and the outer arc permanent magnets are both T-shaped, and the horizontal sections of the inner arc permanent magnets and the outer arc permanent magnets are close to the edge of the permanent magnet mounting disk. The present invention is suitable for use as a coupling.

Description

Technical Field

[0001] The invention belongs to the field of magnetic transmission, and in particular to the field of permanent magnet eddy current couplings. Background Art

[0002] As a connecting device in mechanical systems, couplings are widely used. At present, the couplings used in the mechanical field are divided into mechanical couplings, hydraulic couplings and magnetic transmission couplings. Mechanical couplings transmit torque through mechanical connection. The additional force generated during operation is relatively large, and the ability to isolate vibration is relatively weak. Hydraulic couplings transmit torque through the action between fluids, and the transmission efficiency is reduced, the service life is short, and the later maintenance workload is large. Magnetic transmission couplings use the interaction between magnetic fields to transmit torque. It belongs to non-contact torque transmission and has the characteristics of vibration isolation, noise isolation, strong compensation for shaft deviation, and maintenance-free. Permanent magnet eddy current coupling is a branch of magnetic transmission coupling. It is mainly composed of permanent magnetic disk and eddy current disk. Permanent magnets are installed on the permanent magnetic disk. When it works, a certain speed difference is formed between the permanent magnetic disk and the eddy current disk. The eddy current disk cuts the magnetic lines of force in the magnetic field space generated by the permanent magnetic disk. The induced magnetic field is generated in the eddy current disk. The coupling realizes the transmission of torque through the interaction between the induced magnetic fields on the permanent magnetic disk and the eddy current disk.

[0003] At present, the permanent magnets embedded on the permanent magnetic disk of the permanent magnet eddy current coupling are rectangular or fan-shaped structures. These two types of permanent magnets have simple structures and few adjustable parameters. The arrangement options of the permanent magnets on the permanent magnetic disk are limited, and the degree of spatial optimization for improving the torque transmission capacity of the coupling is limited, which limits the application of permanent magnet eddy current couplings under high torque and installation restricted conditions. Summary of the invention

[0004] The purpose of the present invention is to solve the problems of low torque transmission capacity and limited installation of existing permanent magnet eddy current couplings, and to further increase the magnetic circuit optimization space of the coupling, and to provide a permanent magnet eddy current coupling.

[0005] A permanent magnet eddy current coupling according to the present invention comprises a conductor unit and a permanent magnet unit, wherein the conductor unit and the permanent magnet unit are coaxially arranged with an air gap in between;

[0006] The conductor unit includes a conductor back iron disk 2 and a conductor disk 3; the permanent magnet unit includes a permanent magnet 5, a permanent magnet back iron disk 6 and a permanent magnet mounting disk 8;

[0007] The conductor disc 3 is coaxially connected to the conductor back iron disc 2, and the conductor disc 3 is located on the air gap side;

[0008] The permanent magnet mounting plate 8 is coaxially connected to the permanent magnet back iron plate 6, and the permanent magnet mounting plate 8 is located on the air gap side;

[0009] The permanent magnets 5 are arranged at equal intervals along the circumference of the permanent magnet mounting plate 8;

[0010] The permanent magnet 5 includes an inner arc permanent magnet 501 and an outer arc permanent magnet 502, and both the inner arc permanent magnet 501 and the outer arc permanent magnet 502 are T-shaped;

[0011] The inner arc permanent magnets 501 are arranged along the inner circumference of the permanent magnet mounting disk 8, and the outer arc permanent magnets 502 are arranged along the outer circumference of the permanent magnet mounting disk 8;

[0012] The T-shaped horizontal sections of the inner arc permanent magnet 501 and the outer arc permanent magnet 502 are respectively close to the inner and outer edges of the permanent magnet mounting plate 8;

[0013] The inner arc permanent magnets 501 and the outer arc permanent magnets 502 are arranged alternately; the polarities of the inner arc permanent magnets 501 and the outer arc permanent magnets 502 are opposite.

[0014] Furthermore, the inner arc permanent magnet 501 and the outer arc permanent magnet 502 have the same size.

[0015] Furthermore, two flanges 1 are included, and the two flanges 1 are respectively arranged on the outer sides of the conductor back iron disk 2 and the permanent magnet back iron disk 6 .

[0016] Furthermore, the number of the inner arc permanent magnets 501 and the outer arc permanent magnets 502 is the same, and both are even numbers.

[0017] The present invention adopts T-shaped permanent magnets, which provides more adjustable parameters for optimizing the magnetic circuit of the coupling in a limited space, increases the freedom of optimizing the magnetic circuit parameters, and can further improve the torque transmission capacity of the coupling by changing the external dimensions of the permanent magnetic disk and the layout of the magnetic circuit. For high-power, low-speed permanent magnetic eddy current couplings, the magnetic coupling of this structure has a simple structure, low space requirements for the unit, and makes the layout of the application unit more flexible. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural principle diagram of the permanent magnetic eddy current coupling of the present invention;

[0019] Figure 2 Schematic diagram of the distribution of permanent magnets on the permanent magnetic disk;

[0020] Figure 3 Schematic diagram of the appearance of a permanent magnet. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0023] Specific implementation method 1: The following is combined Figures 1 to 3 The present embodiment is described. The present embodiment describes a permanent magnet eddy current coupling, which comprises a conductor unit and a permanent magnet unit. The conductor unit and the permanent magnet unit are coaxially arranged with an air gap in between.

[0024] The conductor unit includes a conductor back iron disk 2 and a conductor disk 3; the permanent magnet unit includes a permanent magnet 5, a permanent magnet back iron disk 6 and a permanent magnet mounting disk 8;

[0025] The conductor disc 3 is coaxially connected to the conductor back iron disc 2, and the conductor disc 3 is located on the air gap side;

[0026] The permanent magnet mounting plate 8 is coaxially connected to the permanent magnet back iron plate 6, and the permanent magnet mounting plate 8 is located on the air gap side;

[0027] The permanent magnets 5 are arranged at equal intervals along the circumference of the permanent magnet mounting plate 8;

[0028] The permanent magnet 5 includes an inner arc permanent magnet 501 and an outer arc permanent magnet 502, and both the inner arc permanent magnet 501 and the outer arc permanent magnet 502 are T-shaped;

[0029] The inner arc permanent magnets 501 are arranged along the inner circumference of the permanent magnet mounting disk 8, and the outer arc permanent magnets 502 are arranged along the outer circumference of the permanent magnet mounting disk 8;

[0030] The T-shaped horizontal sections of the inner arc permanent magnet 501 and the outer arc permanent magnet 502 are respectively close to the inner and outer edges of the permanent magnet mounting plate 8;

[0031] The inner arc permanent magnets 501 and the outer arc permanent magnets 502 are arranged alternately; the polarities of the inner arc permanent magnets 501 and the outer arc permanent magnets 502 are opposite.

[0032] like Figure 2As shown, the permanent magnet 5 is divided into an inner arc permanent magnet 501 and an outer arc permanent magnet 502, which are evenly distributed along the circumferential direction of the permanent magnet back iron disk 6. The even distribution of the permanent magnet 5 is conducive to the same force on the disk in all directions, reducing the additional force generated during operation. The axial section of each permanent magnet 5 is T-shaped, and its permanent magnetic polarity is axial. Its N pole and S pole are distributed along the axial direction of the disk. The N pole and S pole of the permanent magnet 5 are alternately arranged along the circumference, and the staggered inlay provides a bypass for the magnetic field return, which helps to reduce magnetic resistance, increase the eddy current intensity generated by induction, and increase the transmitted force and torque. If the inner arc side of the permanent magnet mounting disk 8 is arranged with an N-pole T-shaped inner arc permanent magnet 501, the outer arc is arranged with an S-pole T-shaped outer arc permanent magnet 502. On the contrary, if the outer arc side is arranged with an N-pole T-shaped outer arc permanent magnet 502, the inner arc side is arranged with an S-pole T-shaped inner arc permanent magnet 501. Compared with sector-shaped and rectangular permanent magnets, the T-shaped permanent magnet 5 provides two additional sets of adjustable parameters for optimizing torque and power transmission efficiency, namely, the proportion of the radial dimension of the T-shaped head and the circumferential duty cycle, thereby increasing the freedom space for optimizing parameters.

[0033] Furthermore, the inner arc permanent magnet 501 and the outer arc permanent magnet 502 have the same size.

[0034] Furthermore, two flanges 1 are included, and the two flanges 1 are respectively arranged on the outer sides of the conductor back iron disk 2 and the permanent magnet back iron disk 6 .

[0035] Furthermore, the number of the inner arc permanent magnets 501 and the outer arc permanent magnets 502 is the same, and both are even numbers.

[0036] Furthermore, the polarities of the inner arc permanent magnet 501 and the outer arc permanent magnet 502 are both axial.

[0037] The permanent magnet eddy current coupling of the present invention has a simple structure, and the connecting flange 1 is located outside the conductor back iron disk 2 and the permanent magnet back iron disk 6. The permanent magnet 5, the permanent magnet back iron disk 6, the permanent magnet mounting disk 8 and the flange 1 adjacent to the permanent magnet mounting disk 8 constitute a permanent magnet rotor, and the conductor rotor is coaxially arranged with the conductor rotor. The permanent magnet 5 is mounted on the permanent magnet mounting disk 8 and is located near the eddy current disk. The permanent magnet back iron disk 6 is located outside the permanent magnet mounting disk 8. There are an even number of pairs of permanent magnets 5 on the permanent magnet mounting disk 8, and their shapes are as follows: Figure 3 shown.

[0038] When the driving shaft drives the conductor rotor to rotate, the permanent magnet rotor connected to the load shaft rotates relative to the conductor rotor, generating eddy currents on the conductor disk, causing the permanent magnet disk rotor and the load shaft to rotate and transmit torque. There are an even number of pairs of permanent magnets on the permanent magnet disk, which are staggered and evenly distributed along the circumference. The even distribution of permanent magnets is conducive to the same force on the permanent magnet disk in all directions, reducing the additional force during operation. The axial section of each permanent magnet is T-shaped, and its permanent magnet polarity is axial, that is, the N pole and the S pole are distributed along the axial direction of the disk, and the N pole and S pole of the permanent magnet on the same side are arranged alternately along the circumference. If the N pole T-shaped permanent magnet is arranged on the inner arc side, the S pole T-shaped permanent magnet is arranged on the outer arc. On the contrary, if the N pole T-shaped permanent magnet is arranged on the outer arc side, the S pole T-shaped permanent magnet is arranged on the inner arc side. The staggered inlay helps to reduce the magnetic resistance of the magnetic circuit and increase the intensity of the eddy current generated by induction.

[0039] When the present invention is in use, when the driving shaft drives the conductor rotor to rotate, the permanent magnet rotor connected to the load shaft rotates relative to the conductor rotor, generating eddy currents on the conductor disk, so that the permanent magnet disk rotor and the load shaft rotate and transmit torque. There are an even number of pairs of permanent magnets on the permanent magnet disk, which are staggered and evenly distributed along the circumference. The even distribution of permanent magnets is conducive to the permanent magnet disk being subjected to the same force in all directions, thereby reducing the additional force during operation. The axial section of each permanent magnet is T-shaped, and its permanent magnet polarity is axial, that is, the N pole and the S pole are distributed along the axial direction of the disk, and the N pole and the S pole of the permanent magnet on the same side are alternately arranged along the circumference. If the inner arc side is arranged with an N pole T-shaped permanent magnet, the outer arc is arranged with an S pole T-shaped permanent magnet. On the contrary, if the outer arc side is arranged with an N pole T-shaped permanent magnet, the inner arc side is arranged with an S pole T-shaped permanent magnet. The staggered inlay helps to reduce the magnetic resistance of the magnetic circuit and increase the intensity of the eddy current generated by induction.

[0040] Although the present invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the present invention. It should therefore be understood that many modifications may be made to the exemplary embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the various dependent claims and features described herein may be combined in a manner different from that described in the original claims. It should also be understood that features described in conjunction with individual embodiments may be used in other described embodiments.

Claims

1. A permanent magnet eddy current coupling, characterized in that: It comprises a conductor unit and a permanent magnet unit, wherein the conductor unit and the permanent magnet unit are coaxially arranged with an air gap in between; The conductor unit comprises a conductor back iron disk (2) and a conductor disk (3); the permanent magnet unit comprises a permanent magnet (5), a permanent magnet back iron disk (6) and a permanent magnet mounting disk (8); The conductor disk (3) is coaxially connected to the conductor back iron disk (2), and the conductor disk (3) is located on the air gap side; The permanent magnet mounting plate (8) is coaxially connected to the permanent magnet back iron plate (6), and the permanent magnet mounting plate (8) is located on the air gap side; The permanent magnets (5) are arranged at equal intervals along the circumference of the permanent magnet mounting plate (8); The permanent magnet (5) comprises an inner arc permanent magnet (501) and an outer arc permanent magnet (502), wherein the inner arc permanent magnet (501) and the outer arc permanent magnet (502) are both T-shaped; The inner arc permanent magnets (501) are arranged along the inner circumference of the permanent magnet mounting disk (8), and the outer arc permanent magnets (502) are arranged along the outer circumference of the permanent magnet mounting disk (8); The T-shaped horizontal sections of the inner arc permanent magnet (501) and the outer arc permanent magnet (502) are respectively close to the inner and outer edges of the permanent magnet mounting plate (8); The inner arc permanent magnets (501) and the outer arc permanent magnets (502) are arranged alternately; and the polarities of the inner arc permanent magnets (501) and the outer arc permanent magnets (502) are opposite.

2. A permanent magnet eddy current coupling according to claim 1, characterized in that: The inner arc permanent magnet (501) and the outer arc permanent magnet (502) have the same size.

3. A permanent magnet eddy current coupling according to claim 1 or 2, characterized in that: It also comprises two flanges (1), wherein the two flanges (1) are respectively arranged on the outside of the conductor back iron disk (2) and the permanent magnet back iron disk (6).

4. A permanent magnet eddy current coupling according to claim 1 or 2, characterized in that: The number of the inner arc permanent magnets (501) and the outer arc permanent magnets (502) is the same and both are even numbers.

5. A permanent magnet eddy current coupling according to claim 1 or 2, characterized in that: The polarities of the inner arc permanent magnet (501) and the outer arc permanent magnet (502) are both axial.

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