CN212231321U - A permanent magnet eddy current coupling - Google Patents

Abstract

A permanent magnet eddy current coupling belongs to the field of magnetic transmission, in particular to the field of permanent magnet eddy current couplings. The utility model solves the problems that the existing permanent magnet eddy current coupling has small torque transmission capacity and limited installation. 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 The permanent magnet installation plate; the conductor plate and the back iron plate are coaxially connected, and the conductor plate is located on the air gap side; the permanent magnet installation plate is coaxially connected with the permanent magnet back iron plate, and the permanent magnet installation plate is located on the air gap side; The magnet installation discs are arranged at equal intervals in the circumferential direction; the permanent magnets include inner arc permanent magnets and outer arc permanent magnets. segment near the edge of the permanent magnet mounting disc. The utility model is suitable for use as a coupling.

Description

A permanent magnet eddy current coupling

technical field

The utility model belongs 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. The mechanical coupling transmits torque through mechanical connection, the additional force generated during operation 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 large. Magnetic transmission coupling uses the interaction between magnetic fields to transmit torque, which belongs to non-contact torque transmission. The permanent magnet eddy current coupling is a branch of the magnetic transmission coupling. It is mainly composed of a permanent disk and an eddy current disk. A permanent magnet is installed on the permanent disk, and a certain speed difference is formed between the permanent disk and the eddy current disk during operation. The eddy current disk moves to cut the magnetic field lines in the magnetic field space generated by the permanent disk, and an induced magnetic field is generated in the eddy current disk. The coupling realizes the transmission of torque through the interaction between the permanent disk and the induced magnetic field on the eddy current disk.

At present, the permanent magnets inlaid on the permanent 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 parameters that can be adjusted. There are limited options for the arrangement of permanent magnets on the permanent disk. The limited degree of space optimization of capacity limits the application of permanent magnet eddy current couplings under conditions of high torque and limited installation.

Utility model content

The purpose of the utility model is to solve the problems of small torque transmission capacity and limited installation of the existing permanent magnet eddy current coupling, and in order to further improve the magnetic circuit optimization space of the coupling, a permanent magnetic eddy current coupling is provided.

The permanent magnet eddy current coupling of the utility model 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 the middle;

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;

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 disk 8 is coaxially connected to the permanent magnet back iron disk 6, and the permanent magnet mounting disk 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 includes an inner arc permanent magnet 501 and an outer arc permanent magnet 502, and the inner arc permanent magnet 501 and the outer arc permanent magnet 502 are both T-shaped;

The inner arc permanent magnets 501 are equally arranged along the inner circumference of the permanent magnet mounting plate 8, and the outer arc permanent magnets 502 are arranged along the outer circumference of the permanent magnet mounting plate 8;

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

And the inner arc permanent magnets 501 and the outer arc permanent magnets 502 are alternately arranged; the inner arc permanent magnets 501 and the outer arc permanent magnets 502 have opposite polarities.

Further, the inner arc permanent magnet 501 and the outer arc permanent magnet 502 have the same size.

Further, two flanges 1 are also 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 .

Further, the numbers of the inner arc permanent magnets 501 and the outer arc permanent magnets 502 are the same, and both are even.

The utility model adopts the T-shaped permanent magnet, which provides more adjustable parameters for optimizing the magnetic circuit of the coupling under limited space, and increases the freedom degree space for optimizing the magnetic circuit parameters. And the layout of the magnetic circuit further improves the torque transmission capacity of the coupling. For the permanent magnet eddy current coupling with high power and low speed, the magnetic coupling of this structure is simple in structure and requires less space for the unit to be used, which makes the arrangement of the applied unit more flexible.

Description of drawings

Fig. 1 is the structural principle diagram of the permanent magnet eddy current coupling of the present invention;

Fig. 2 is a schematic diagram of the distribution of permanent magnets on the permanent disk;

Figure 3 is a schematic diagram of the outline of the permanent magnet.

Detailed ways

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the implementations. example. 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.

Embodiment 1: This embodiment will be described below with reference to FIGS. 1 to 3 . The permanent magnet eddy current coupling described in this embodiment includes a conductor unit and a permanent magnet unit, and the conductor unit and the permanent magnet unit are coaxial. set, the middle is the air gap;

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;

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 disk 8 is coaxially connected to the permanent magnet back iron disk 6, and the permanent magnet mounting disk 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 includes an inner arc permanent magnet 501 and an outer arc permanent magnet 502, and the inner arc permanent magnet 501 and the outer arc permanent magnet 502 are both T-shaped;

The inner arc permanent magnets 501 are equally arranged along the inner circumference of the permanent magnet mounting plate 8, and the outer arc permanent magnets 502 are arranged along the outer circumference of the permanent magnet mounting plate 8;

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

And the inner arc permanent magnets 501 and the outer arc permanent magnets 502 are alternately arranged; the inner arc permanent magnets 501 and the outer arc permanent magnets 502 have opposite polarities.

As shown in FIG. 2 , the permanent magnets 5 are divided into inner arc permanent magnets 501 and outer arc permanent magnets 502, which are evenly distributed along the circumferential direction of the permanent magnet back iron disk 6, and the uniform distribution of the permanent magnets 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 magnet polarity is axial, its N pole and S pole are distributed along the axial direction of the magnetic disk, and the N pole and S pole of the permanent magnet 5 are alternately arranged along the circumference, The staggered mosaic provides a bypass for the return flow of the magnetic field, which helps to reduce the reluctance, increase the intensity of the eddy current generated by the induction, and increase the transmitted force and torque. If an N-pole T-shaped inner-arc permanent magnet 501 is arranged on the inner arc side of the permanent magnet mounting plate 8, and an S-pole T-shaped outer arc permanent magnet 502 is arranged at the outer arc. Conversely, if the N-pole T-shaped outer arc permanent magnet 502 is arranged on the outer arc side, the S-pole T-shaped inner arc permanent magnet 501 is arranged on the inner arc side. Compared with sector and rectangular permanent magnets, the T-shaped permanent magnet 5 provides two additional sets of adjustable parameters for optimizing the torque and power transmission efficiency, namely the proportion of the radial size of the T-shaped head and the circumferential duty cycle, thereby Added optimization parameter degrees of freedom space.

Further, the inner arc permanent magnet 501 and the outer arc permanent magnet 502 have the same size.

Further, two flanges 1 are also 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 .

Further, the numbers of the inner arc permanent magnets 501 and the outer arc permanent magnets 502 are the same, and both are even.

Further, the polarities of the inner arc permanent magnet 501 and the outer arc permanent magnet 502 are both axial.

The permanent magnet eddy current coupling of the utility model has a simple structure, and the connecting flange 1 is located on the outer side of the conductor back iron disk 2 and the outer side of 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, the conductor rotor and the conductor rotor are arranged coaxially, and the permanent magnet 5 is installed on the permanent magnet mounting plate. The disk 8 is located on the side close to the eddy current disk, and the permanent magnet back iron disk 6 is located outside the permanent magnet mounting disk 8 . There are even-numbered pairs of permanent magnets 5 on the permanent magnet mounting plate 8 , the shapes of which are shown in FIG. 3 .

When the drive shaft drives the conductor rotor to rotate, the permanent magnet rotor connected to the load shaft rotates relative to the conductor rotor, and an eddy current is generated on the conductor disk, so that the permanent disk rotor and the load shaft rotate to transmit torque. There are an even number of pairs of permanent magnets staggered inlaid on the permanent disk and evenly distributed along the circumference. The uniform distribution of the permanent magnets is conducive to the same force on the permanent disk in all directions and reduces 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 and S poles are distributed along the axial direction of the magnetic disk, while the N and S poles of the permanent magnets on the same side are alternately arranged along the circumference , if the N-pole T-shaped permanent magnet is arranged on the inner arc side, and 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, and the staggered mosaic helps to reduce the magnetic resistance of the magnetic circuit and increase the eddy current intensity generated by induction.

When the utility model is in use, when the drive shaft drives the conductor rotor to rotate, the permanent magnet rotor connected to the load shaft rotates relative to the conductor rotor, and an eddy current is generated on the conductor disc, so that the permanent magnet rotor and the load shaft rotate to transmit torque. There are an even number of pairs of permanent magnets staggered inlaid on the permanent disk and evenly distributed along the circumference. The uniform distribution of the permanent magnets is conducive to the same force on the permanent disk in all directions and reduces 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 and S poles are distributed along the axial direction of the magnetic disk, while the N and S poles of the permanent magnets on the same side alternate along the circumference Arrangement, 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, and the staggered mosaic helps to reduce the magnetic resistance of the magnetic circuit and increase the eddy current intensity generated by induction.

Although the invention has been described herein with reference to specific embodiments, it should be understood that these embodiments are merely exemplary 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. A permanent magnet eddy current coupling is characterized by comprising a conductor unit and a permanent magnet unit, wherein the conductor unit and the permanent magnet unit are coaxially arranged, and an air gap is arranged in the middle of the conductor unit and the permanent magnet unit;

the conductor unit comprises a conductor back iron disc (2) and a conductor disc (3); the permanent magnet unit comprises a permanent magnet (5), a permanent magnet back iron disc (6) and a permanent magnet mounting disc (8);

the conductor disc (3) is coaxially connected with the conductor back iron disc (2), and the conductor disc (3) is positioned on the air gap side;

the permanent magnet mounting disc (8) is coaxially connected with the permanent magnet back iron disc (6), and the permanent magnet mounting disc (8) is positioned on the air gap side;

the permanent magnets (5) are arranged at equal intervals along the circumferential direction of the permanent magnet mounting disc (8);

the permanent magnet (5) comprises an inner arc permanent magnet (501) and an outer arc permanent magnet (502), and 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 disc (8) in an equal way, and the outer arc permanent magnets (502) are arranged along the outer circumference of the permanent magnet mounting disc (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 edge and the outer edge of the permanent magnet mounting disc (8);

the inner arc permanent magnets (501) and the outer arc permanent magnets (502) are arranged in a staggered mode; the polarity of the inner arc permanent magnet (501) is opposite to that of the outer arc permanent magnet (502).

2. A permanent magnet eddy current coupling according to claim 1, characterised in that the inner arc permanent magnets (501) and the outer arc permanent magnets (502) are of the same size.

3. A permanent magnet eddy current coupling according to claim 1 or 2, characterized by further comprising two flanges (1), said two flanges (1) being arranged outside the conductor back iron disc (2) and the permanent magnet back iron disc (6), respectively.

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

5. A permanent magnet eddy current coupling according to claim 1 or 2, characterized in that the polarity of the inner arc permanent magnets (501) and the outer arc permanent magnets (502) is axial.

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