CN111600457A - An axial permanent magnet eddy current coupling - Google Patents

Abstract

An axial permanent magnet eddy current coupling relates to the field of magnetic transmission, in particular to the field of permanent magnet eddy current coupling. The problem of low torque transmission capacity of the magnetic circuit of the existing axial permanent magnet eddy current coupling is solved. In the present invention, the outer side walls of the two permanent magnet rotors are fixedly connected by connecting pieces; the air gap sides of the two permanent magnet rotors are uniformly arranged with a plurality of permanent magnets in the circumferential direction, and two adjacent permanent magnets on the same permanent magnet rotor The magnetizing directions of the two permanent magnet rotors are opposite, and the magnetizing directions of the air gap sides of the permanent magnets arranged oppositely on the two permanent magnet rotors are opposite; the magnetizing directions of the permanent magnets on the two permanent magnet rotors are both axial magnetizing; the drive end is connected to One end face of the flange is fixed on the conductor rotor through a permanent magnet rotor, and there is a gap between the permanent magnet rotor and the connecting flange of the driving end, and the other end face of the connecting flange of the driving end is used for fixed connection with external driving equipment; One end face of the load end connecting flange is fixed on the other permanent magnet rotor. Mainly used for transmission.

Description

An axial permanent magnet eddy current coupling

technical field

The invention relates to the field of magnetic transmission, in particular to the field of permanent magnet eddy current couplings.

Background technique

Couplings are widely used as connecting devices in mechanical systems. At present, the couplings used in the mechanical field are divided into mechanical couplings, hydraulic couplings and magnetic transmission couplings; among them, mechanical couplings transmit torque through mechanical coupling, and additional The force is relatively large, and the ability to isolate vibration is relatively weak; the hydraulic coupling transmits torque through the action of fluids, the transmission efficiency is reduced, the service life is short, and the later maintenance workload is relatively large; the magnetic transmission coupling uses The interaction between the magnetic fields transmits the torque, which belongs to the non-contact torque transmission, and has the characteristics of vibration isolation, noise isolation, strong ability to compensate the shaft system deviation, and maintenance-free; the permanent magnet eddy current coupling is a branch of the magnetic transmission coupling. When it works, a certain speed difference will be formed on both sides of the coupling. The coupling realizes the transmission of torque through the interaction between the permanent magnetic disk and the induced magnetic field on the eddy current disk.

However, the current axial permanent magnet eddy current coupling mainly has two structures:

The first type, the permanent disk and the conductor disk of the axial permanent magnet eddy current coupling are arranged one-to-one. The driving efficiency of this coupling is low, the magnetic torque power provided per unit volume is not high, and it will Generate additional axial force, which is only used in some special occasions;

The second type, the permanent disk and the conductor disk of the axial permanent magnet eddy current coupling are arranged in pairs, one permanent disk is located in the middle of the coupling, and two eddy current disks are located on both sides of the permanent disk respectively. Although the torque transmission capacity of the coupling has a certain improvement compared to the coupling of the first structure, the torque transmission capacity is still very low. Therefore, the above problems need to be solved urgently.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide an axial permanent magnet eddy current coupling in order to solve the problem of low torque transmission capacity of the magnetic circuit of the existing axial permanent magnet eddy current coupling.

An axial permanent magnet eddy current coupling, comprising a drive end connecting flange, a load end connecting flange, two permanent magnet rotors, a conductor rotor and a connecting piece; wherein the two permanent magnet rotors and one conductor rotor are coaxial setting, the conductor rotor is located between the two permanent magnet rotors, and an air gap exists between the two permanent magnet rotors and the conductor rotor;

The two permanent magnet rotors and one conductor rotor are both annular structures; the outer side walls of the two permanent magnet rotors are fixedly connected by connecting pieces;

The air gap sides of the two permanent magnet rotors are uniformly arranged with a plurality of permanent magnets along the circumferential direction, and the magnetization directions of the permanent magnets on the two permanent magnet rotors are axial magnetization;

The magnetizing directions of two adjacent permanent magnets on the same permanent magnet rotor are opposite, and the magnetic pole directions of the permanent magnets oppositely arranged on the two permanent magnet rotors are opposite to the air gap side;

One end face of the drive end connecting flange is fixed on the conductor rotor through a permanent magnet rotor, and there is a gap between the permanent magnet rotor and the drive end connecting flange, and the other end face of the drive end connecting flange is used for connecting with external drive equipment. fixed connection;

One end face of the load end connecting flange is fixed on the other permanent magnet rotor.

Preferably, the eddy current coupling further comprises two mounting discs, the mounting discs are annular structures and are arranged coaxially with the permanent magnet rotor;

The two mounting disks are respectively fixed on the air gap sides of the two permanent magnet rotors, and one end face of each mounting disk is provided with a mounting groove, and the mounting groove faces the permanent magnet rotor where it is located;

The permanent magnets provided on each permanent magnet rotor are fixed in the mounting grooves of the mounting plate connected to the permanent magnet rotor, and the permanent magnets are in contact with the corresponding permanent magnet rotors.

Preferably, the connecting member is a connecting rod or a cylindrical structure.

Preferably, the permanent magnet has a fan-shaped structure or a rectangular structure.

Preferably, the air gaps between the two permanent magnet rotors and the conductor rotors are the same.

The beneficial effects brought by the present invention are: in the present invention, two adjacent permanent magnets on one permanent magnet rotor and two permanent magnets corresponding to another permanent magnet rotor, a total of four permanent magnets constitute a magnetic circuit unit, 4 permanent magnets form a closed magnetic circuit path.

The present invention is realized by using two permanent magnet rotors and one conductor rotor, so that the magnetic resistance of the conductor rotor of the coupling is smaller, and the relative positional relationship between the two permanent magnet rotors and one conductor rotor and the arrangement of the permanent magnets of the present invention , so that the direction of the magnetic lines of force in the magnetic circuit unit is conducive to the formation of the induced eddy current on the conductor rotor, the magnetic energy utilization rate of the permanent magnet is higher, and the larger torque can be transmitted under the same radial space size, thereby improving the torque transmission capacity of the magnetic circuit.

Aiming at the high-power, low-speed permanent magnet eddy current coupling in the prior art, the axial permanent magnet eddy current coupling proposed by the present invention has a simple structure and low requirements on the radial space of the unit used, so that the application unit layout is more flexible.

Description of drawings

1 is a schematic diagram of the axial structure of an axial permanent magnet eddy current coupling according to the present invention;

Fig. 2 is the sectional view of Fig. 1 in the A-A direction;

3 is a cross-sectional view of FIG. 1 in the direction B-B;

FIG. 4 is a schematic diagram of the principle of a magnetic circuit composed of four permanent magnets on two permanent magnet rotors.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

It should be noted that the embodiments of the present invention and the features of the embodiments may be combined with each other under the condition of no conflict.

Referring to FIG. 1 to FIG. 4, this embodiment is described. An axial permanent magnet eddy current coupling described in this embodiment includes a drive end connecting flange 1, a load end connecting flange 2, two permanent magnet rotors 3, A conductor rotor 4 and a connector 5; wherein, two permanent magnet rotors 3 and one conductor rotor 4 are coaxially arranged, the conductor rotor 4 is located between the two permanent magnet rotors 3, and between the two permanent magnet rotors 3 and the conductor rotor 4 There are air gaps;

The two permanent magnet rotors 3 and one conductor rotor 4 are annular structures; the outer side walls of the two permanent magnet rotors 3 are fixedly connected by connecting pieces 5;

The air gap sides of the two permanent magnet rotors 3 are uniformly arranged with a plurality of permanent magnets 3-1 along the circumferential direction, and the magnetization directions of the permanent magnets 3-1 on the two permanent magnet rotors 3 are axial magnetization;

The magnetization directions of the adjacent two permanent magnets 3-1 on the same permanent magnet rotor 3 are opposite, and the magnetic pole directions of the air gap sides of the permanent magnets 3-1 oppositely arranged on the two permanent magnet rotors 3 are opposite;

One end face of the drive end connecting flange 1 is fixed on the conductor rotor 4 through a permanent magnet rotor 3, and there is a gap between the permanent magnet rotor 3 and the drive end connecting flange 1, and the other end face of the drive end connecting flange 1 For fixed connection with external drive equipment;

One end face of the load end connecting flange 2 is fixed on the other permanent magnet rotor 3 .

In specific application, the drive end connecting flange 1 is driven by an external drive device (motor, etc.), the drive end connecting flange 1 is connected with the conductor rotor 4, and rotates synchronously, the conductor rotor 4 is a conductor, and the conductor rotor 4 is used for cutting The magnetic field lines of the two permanent magnet rotors 3 move, the conductor rotor 4 generates an induced current, the induced current generates an induced magnetic field, the induced magnetic field interacts with the permanent magnetic field, and the two permanent magnet rotors 3 are fixed together by the connecting piece 5, and the two Under the action of the tangential force of the magnetic field, the tangential force generates a rotational force relative to the circumferential direction of rotation, and the two permanent magnet rotors 3 rotate asynchronously relative to the conductor rotor 4 under the action of the rotational force distance. The N poles and S poles of the adjacent permanent magnets 3-1 on the same permanent magnet rotor 3 are alternately and evenly arranged along the circumference. The uniform distribution of the permanent magnets 3-1 is beneficial to the permanent magnet rotor 3 receiving the same force in all directions, reducing the running time. additional force at the time. The permanent magnet 3-1 is axial, and the axial polarities of the permanent magnets 3-1 correspondingly arranged on the two left-right symmetrical permanent magnet rotors 3 are the same. The purpose is to make the magnetic field axially penetrate the conductor disk and improve the conductor The magnetic flux density on the disk produces greater eddy current strength, which in turn increases the transmitted force and torque.

In specific applications, the permanent magnet rotor 3 is generally made of carbon steel or other ferromagnetic materials.

The two permanent magnet rotors 3 are arranged opposite to each other. Therefore, the viewing angle of the direction C1-C1 in FIG. 2 is the same as the viewing angle of the direction C2-C2 in FIG. -1 and two permanent magnets 3-1 in the rectangular frame in the direction of C2-C2 in Fig. 3, a total of 4 permanent magnets 3-1 constitute a magnetic circuit unit as an example to illustrate, in Fig. 4, a permanent magnet The two permanent magnets 3 - 1 on the rotor 3 are respectively disposed opposite to the two permanent magnets 3 - 1 on the other permanent magnet rotor 3 . The magnetic lines of force shown in FIG. 4 are beneficial to the formation of induced eddy currents on the conductor rotor 4 and improve the torsional transmission capability of the magnetic circuit.

Further, referring specifically to FIG. 1 and FIG. 2 , the eddy current coupling also includes two mounting discs 6, and the mounting discs 6 are annular structures and are arranged coaxially with the permanent magnet rotor 3;

The two mounting disks 6 are respectively fixed on the air gap sides of the two permanent magnet rotors 3, and one end face of each mounting disk 6 is provided with a mounting groove, and the mounting groove faces the permanent magnet rotor 3 where it is located;

The permanent magnets 3 - 1 provided on each permanent magnet rotor 3 are fixed in the mounting grooves of the mounting plate 6 connected to the permanent magnet rotor 3 , and the permanent magnets 3 - 1 are in contact with the corresponding permanent magnet rotor 3 .

In this preferred embodiment, the mounting plate 6 can be made of a paramagnetic or diamagnetic material with a relative magnetic permeability close to that of air, and the permanent magnet rotor 3 can be made of a ferromagnetic material with high magnetic permeability.

Further, referring to FIG. 1 and FIG. 2 , the connecting member 5 is a connecting rod or a cylindrical structure.

In this preferred embodiment, the two permanent magnet rotors 3 can be fixed together by a simple connecting piece 5 to realize the synchronous rotation of the two. The connecting piece 5 has a simple structure and is easy to implement.

Further, referring to FIG. 1 and FIG. 2 , the permanent magnet 3-1 has a fan-shaped structure or a rectangular structure.

Further, referring to FIG. 1 and FIG. 2 , the air gaps between the two permanent magnet rotors 3 and the conductor rotor 4 are the same.

In this preferred embodiment, the air gaps between the two permanent magnet rotors 3 and the conductor rotor 4 are the same, so that the permanent magnets 3-1 on both sides of the conductor rotor 4 have the same axial component force on the conductor rotor 4 and can cancel each other.

Although the invention has been described herein with reference to specific embodiments, it should be understood that these embodiments are merely illustrative of the principles and applications of the invention. It should therefore be understood that many modifications may be made to the exemplary embodiments and other arrangements can be devised without departing from the spirit and scope of the invention as defined by the appended claims. It should be understood that the features described in the various dependent claims and herein may be combined in different ways than are described in the original claims. It will also be appreciated that features described in connection with a single embodiment may be used in other described embodiments.

Claims (5)

1. An axial permanent magnet eddy current coupling is characterized by comprising a driving end connecting flange (1), a load end connecting flange (2), two permanent magnet rotors (3), a conductor rotor (4) and a connecting piece (5); the two permanent magnet rotors (3) and the conductor rotor (4) are coaxially arranged, the conductor rotor (4) is positioned between the two permanent magnet rotors (3), and air gaps exist between the two permanent magnet rotors (3) and the conductor rotor (4);

the two permanent magnet rotors (3) and the conductor rotor (4) are both in circular structures; the outer side walls of the two permanent magnet rotors (3) are fixedly connected through a connecting piece (5);

a plurality of permanent magnets (3-1) are uniformly arranged on the air gap sides of the two permanent magnet rotors (3) along the circumferential direction, and the permanent magnets (3-1) on the two permanent magnet rotors (3) are axially magnetized;

the magnetizing directions of two adjacent permanent magnets (3-1) on the same permanent magnet rotor (3) are opposite, and the magnetic pole directions of the air gap sides of the permanent magnets (3-1) oppositely arranged on the two permanent magnet rotors (3) are opposite;

one end face of the driving end connecting flange (1) penetrates through a permanent magnet rotor (3) to be fixed on the conductor rotor (4), a gap exists between the permanent magnet rotor (3) and the driving end connecting flange (1), and the other end face of the driving end connecting flange (1) is used for being fixedly connected with external driving equipment;

one end face of the load end connecting flange (2) is fixed on the other permanent magnet rotor (3).

2. The axial permanent magnet eddy current coupling according to claim 1, characterized in that the eddy current coupling further comprises two mounting discs (6), the mounting discs (6) are of a circular ring structure and are arranged coaxially with the permanent magnet rotor (3);

the two mounting discs (6) are respectively fixed on the air gap sides of the two permanent magnet rotors (3), one end face of each mounting disc (6) is provided with a mounting groove, and the mounting groove faces to the permanent magnet rotor (3) where the mounting groove is located;

the permanent magnet (3-1) arranged on each permanent magnet rotor (3) is fixed in the mounting groove of the mounting disc (6) connected with the permanent magnet rotor (3), and the permanent magnet (3-1) is in contact with the corresponding permanent magnet rotor (3).

3. An axial permanent magnet eddy current coupling according to claim 1, characterised in that the connecting piece (5) is a connecting rod or a cylindrical structure.

4. An axial permanent magnet eddy current coupling according to claim 1, characterised in that the permanent magnets (3-1) are of a fan-shaped or rectangular configuration.

5. An axial permanent magnet eddy current coupling according to claim 1, characterised in that the air gap distance between the two permanent magnet rotors (3) and the conductor rotor (4) is the same.

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