CN112039242A - Rotor, motor and motor drive device - Google Patents

Abstract

The utility model relates to a rotor, motor and motor drive equipment, the rotor includes rotor subassembly and axle subassembly, wherein, the rotor subassembly includes the permanent magnet, in the axle subassembly is leaked to in order to avoid the magnetic field of permanent magnet, this application is fixed to be set up between rotor subassembly and axle subassembly and is separated the magnetism baffle, because the existence that separates the magnetism baffle, the axle subassembly can't form the magnetic path with the permanent magnet, the magnetic field of permanent magnet just can't leak the axle subassembly in, greatly reduced the magnetic leakage volume of rotor.

Description

Rotors, motors and motor drives

technical field

The present application relates to the technical field of motors, and in particular, to a rotor, a motor and a motor driving device.

Background technique

At present, the rotor of the motor is generally divided into a built-in rotor and a surface-mounted rotor according to the different fixing methods of the permanent magnets. The built-in rotor generally reserves permanent magnet slots on the iron core to embed the permanent magnets in the permanent magnet slots. Surface-mounted rotors attach permanent magnets to the iron core. In order to increase the output force of the motor shaft, a magnetically conductive material is generally used as the shaft of the motor rotor, and the shaft of the motor is generally fixed on the iron core of the rotor to rotate synchronously with the rotation of the rotor, which will lead to permanent The magnet will form a magnetic path with the shaft through the iron core, resulting in the occurrence of magnetic leakage.

In order to reduce the magnetic flux leakage of the rotor, for the built-in rotor, a magnetic isolation bridge is generally set at both ends of the permanent magnet slot to increase the magnetic resistance, but the surface-mounted rotor does not have a permanent magnetic slot body, and the method of the magnetic isolation bridge is not It cannot be used in surface mount rotors, and the flux leakage of surface mount rotors cannot be reduced.

SUMMARY OF THE INVENTION

In order to overcome the problems existing in the related art at least to a certain extent, the present application provides a rotor, a motor and a motor driving device.

According to a first aspect of the present application, there is provided a rotor, comprising: a rotor assembly and a shaft assembly, the rotor assembly including permanent magnets;

A magnetic isolation baffle is fixed between the rotor assembly and the shaft assembly, and the magnetic isolation baffle is used to prevent the magnetic flux lines of the permanent magnets from leaking into the shaft assembly.

Optionally, the magnetic isolation baffle includes at least a sub-baffle disposed at one end of the rotor assembly.

Optionally, the ratio of the thickness of the sub-baffle plate along the axial direction to the length of the permanent magnet along the axial direction satisfies a preset ratio range.

Optionally, the preset ratio interval is

Optionally, a convex structure is provided at the connection between the sub-baffle and the shaft assembly, and a concave structure is provided at the connection between the shaft assembly and the sub-baffle, and the sub-baffle is connected to the sub-baffle. When the shaft assembly is connected, the concave structure is fitted and sleeved on the convex structure.

Optionally, the outer surface of the protruding structure is provided with a plurality of convex strips, the inner surface of the concave structure is provided with grooves that match the plurality of convex strips one-to-one, and the concave structure fits the sleeve. When provided on the protruding structure, the grooves are inserted into the corresponding protruding strips.

Optionally, the magnetic isolation baffle and the rotor assembly are fixedly connected by epoxy resin glue, and the magnetic isolation baffle and the shaft assembly are fixedly connected by epoxy resin glue.

Optionally, the outer diameter of the rotor assembly is the same as the outer diameter of the magnetic isolation baffle.

According to a second aspect of the present application, a motor is provided, comprising: a stator, the rotor according to the first aspect of the present application, and a stator fixing housing;

The stator is fixed in the stator fixing casing, and the rotor is sleeved in the stator.

According to a third aspect of the present application, there is provided a motor drive device, comprising a load and the motor described in the third aspect of the present application;

The motor is used to drive the load to work.

The technical solutions provided by the present application may include the following beneficial effects: the rotor generally includes a rotor assembly and a shaft assembly, wherein the rotor assembly includes a permanent magnet. A magnetic isolation baffle is fixed between them. Due to the existence of the magnetic isolation baffle, the shaft assembly cannot form a magnetic path with the permanent magnet, and the magnetic field of the permanent magnet cannot leak into the shaft assembly, which greatly reduces the magnetic flux leakage of the rotor.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not limiting of the present application.

Description of drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description serve to explain the principles of the application.

FIG. 1 is an axial cross-sectional schematic diagram of a rotor provided by an embodiment of the present application;

2 is a schematic diagram of an axial cross-section of another rotor provided by the present application;

3 is a schematic diagram of a connection structure between a magnetic isolation baffle and a shaft assembly provided by the present application;

4 is a schematic structural diagram of a motor provided by another embodiment of the present application;

FIG. 5 is a schematic structural diagram of a motor driving device provided by another embodiment of the present application.

Detailed ways

Exemplary embodiments will be described in detail herein, examples of which are illustrated in the accompanying drawings. Where the following description refers to the drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the illustrative examples below are not intended to represent all implementations consistent with this application. Rather, they are merely examples of means consistent with some aspects of the present application as recited in the appended claims.

At present, the rotor of the motor is generally divided into a built-in rotor and a surface-mounted rotor according to the different fixing methods of the permanent magnets. The built-in rotor generally reserves permanent magnet slots on the iron core to embed the permanent magnets in the permanent magnet slots. Surface-mounted rotors attach permanent magnets to the iron core. In order to increase the output force of the motor shaft, a magnetically conductive material is generally used as the shaft of the motor rotor, and the shaft of the motor is generally fixed on the iron core of the rotor to rotate synchronously with the rotation of the rotor, which will lead to permanent The magnet will form a magnetic path with the shaft through the iron core, resulting in the occurrence of magnetic leakage.

In order to reduce the magnetic flux leakage of the rotor, for the built-in rotor, a magnetic isolation bridge is generally set at both ends of the permanent magnet slot to increase the magnetic resistance, but the surface-mounted rotor does not have a permanent magnetic slot body, and the method of the magnetic isolation bridge is not It cannot be used in surface mount rotors, and the flux leakage of surface mount rotors cannot be reduced.

It should be noted that the solution of the present application may be based on the rotor of the shaft assembly using a magnetic conductive material (such as 40CrNiMoA) in order to increase the output of the rotor bearing. The use of magnetically conductive material for the shaft assembly will effectively increase the output of the rotor bearing, but the magnetic field of the permanent magnet will leak through the shaft assembly. Therefore, in order to reduce the amount of magnetic leakage, a magnetic isolation baffle is used to isolate the rotor assembly from the shaft assembly.

Please refer to FIG. 1. FIG. 1 is an axial cross-sectional schematic diagram of a rotor provided by an embodiment of the present application.

As shown in FIG. 1 , the rotor provided in this embodiment may include: a rotor assembly and a shaft assembly 2 , and the rotor assembly includes a permanent magnet 11 ;

A magnetic isolation baffle 3 is fixed between the rotor assembly and the shaft assembly, and the magnetic isolation baffle is used to prevent the magnetic field of the permanent magnet from leaking into the shaft assembly.

In this embodiment, the rotor includes a rotor assembly and a shaft assembly, wherein the rotor assembly includes a permanent magnet. In order to prevent the magnetic field of the permanent magnet from leaking into the shaft assembly, a magnetic isolation baffle is fixed between the rotor assembly and the shaft assembly in this application. Due to the existence of the magnetic isolation baffle, the shaft assembly cannot form a magnetic path with the permanent magnet, and the magnetic field of the permanent magnet cannot leak into the shaft assembly, which greatly reduces the magnetic flux leakage of the rotor.

It should be noted that, in this embodiment, the structure of the magnetic isolation baffle can be in many ways, which can be adaptively changed according to different rotor structures. Generally, the rotor assembly of the rotor may include only one permanent magnet, and the shape of the permanent magnet may be but not limited to a solid cylinder. More, the rotor assembly in the rotor may include a rotor iron core and a rotor iron core fixed on the rotor iron core. The permanent magnet on the surface, and the shaft assembly can also include only the front stub shaft and the rear stub shaft, or it can include the front stub shaft, the middle stub shaft and the rear stub shaft. Of course, the structures of the shaft assembly and the rotor assembly are also matched to each other to form a complete rotor. In the following, the rotor assembly including the rotor iron core and the permanent magnets is taken as an example for description. In this example, the rotor iron core and the permanent magnets together form a solid cylinder or a cylinder.

For the rotor whose shaft assembly only includes the front and rear stub shafts, that is, only the front stub shaft and the rear stub shaft, in the existing structure, the rotor core in the rotor assembly of this rotor is solid, while the front stub shaft and the rear stub shaft are all solid. The rear stub shaft is directly fixed on both ends of the rotor core, that is, directly fixed on both ends of the rotor assembly. For this structure, in this embodiment, the magnetic isolation baffle may include at least one sub-baffle, if there is only one sub-baffle The plate can be arranged at either end of the rotor assembly, specifically, it can be between the rotor assembly and the front stub shaft or between the rotor core and the rear stub shaft; if there are two sub-baffles, they can be respectively arranged in the rotor assembly Both ends of the front stub shaft and the rear stub shaft are separated from the rotor assembly.

For the case where the shaft assembly only includes the front and rear short shafts, in order to more effectively reduce the amount of magnetic flux leakage, the ratio of the thickness of the sub-baffle plate along the axial direction to the length of the permanent magnet along the axial direction of the rotor core can be set is any value in the preset scale interval. Because in the rotor, the shape of the rotor core, the front stub shaft and the rear stub shaft is generally a rotating body structure, such as a cylinder or a plurality of cylinders with different bottom diameters (the front stub shaft and the rear stub shaft in Figure 1 are multiple cylinders with different bottom diameters), and the rotating body structures all have a central axis. In this embodiment, the axial direction is the direction along the central axis.

由于永磁体长度越长，其磁场能量也就越大，因此，可以跟随永磁体的长度，适应增加子挡板的厚度，只要保证子挡板的厚度好永磁体的长度之比满足上述预设比例区间即可。Specifically, the ratio of the thickness of the sub-baffle plate along the axial direction to the length of the permanent magnet along the axial direction of the rotor core can satisfy a preset ratio range, and the ratio range can be

Because the longer the length of the permanent magnet, the greater the magnetic field energy. Therefore, the length of the permanent magnet can be adapted to increase the thickness of the sub-baffle plate, as long as the thickness of the sub-baffle plate is good and the ratio of the length of the permanent magnet to the length of the permanent magnet satisfies the above preset ratio range.

In addition, in actual production and life, the specifications of the rotor generally need to comply with certain standards in the industry. Therefore, the size specifications of the components in the rotor are generally within a certain range, that is, the permanent magnets in the rotor are generally in a certain range. The length of the rotor is often fixed, and the length of the permanent magnets in most rotors is the same. Therefore, this embodiment also provides a preset thickness range. In this embodiment, for the rotor in actual production and life, its The thickness of the sub-baffle can be any thickness value in the preset thickness range. Specifically, the above-mentioned preset thickness interval may be between 10 mm and 30 mm.

It should be noted that the thicknesses of the sub-baffles above are all the thicknesses along the axial direction of the shaft assembly, and the lengths of the permanent magnets are all the lengths along the axial direction of the rotor core. The material of the magnetic shielding baffle involved in this embodiment may be, but not limited to, SUS304.

In addition, there is also a rotor shaft assembly including a front short shaft, a middle short shaft and a rear short shaft, wherein the medium short shaft is generally embedded in the rotor iron core, the front short shaft is fixed at one end of the medium short shaft, and the rear short shaft is Fastened to the other end of the short and medium shaft to form a complete shaft. For this type of rotor, the above-mentioned method with only the front and rear short shafts can also be adopted, that is, a sub-baffle plate is arranged between the front short shaft and the middle short shaft or between the rear short shaft and the middle short shaft.

Of course, in order to ensure the integrity of the shaft formed by the above-mentioned front short shaft, middle short shaft and rear short shaft, a magnetic isolation baffle may be arranged between the middle short shaft and the rotor iron core. Referring to FIG. 2 , FIG. 2 is a schematic structural diagram of another rotor provided by the present application.

As shown in Fig. 2, when the shaft assembly of the rotor includes the short and medium shafts 21, the rotor iron core is generally cylindrical, and the cylinder in the center is the position where the short and medium shafts are embedded. The magnetic isolation baffle can be set in a cylindrical shape, and the short and medium shafts are first embedded in the cylindrical magnetic isolation baffle, and then the magnetic isolation baffle embedded with the medium and short shafts is embedded in the rotor core to prevent permanent magnetic isolation. The magnetic field of the magnet leaks into the shaft assembly through the rotor core.

In addition, in order to facilitate the installation of the magnetic isolation baffles at both ends of the medium and short shafts, a medium and short shaft protrusion 211 can be provided at each end of the medium and short shafts. At the position where the shafts are in contact, the middle and short shaft recesses 212 are correspondingly arranged. After the magnetic isolation baffles embedded with the medium and short shafts are embedded in the rotor core, the magnetic isolation baffles at both ends are fixed at both ends of the medium and short shafts. At this time, The middle and short axis protrusions are embedded in the middle and short axis recesses.

In this embodiment, when the shaft assembly is fixed on the magnetic isolation baffle, it is necessary to ensure that the central axis of the shaft assembly and the rotor assembly are on the same straight line after the installation is completed. The positioning is difficult. In order to realize the rapid positioning and installation of the shaft assembly, a raised structure can be provided on the sub-baffle plate. The raised structure is arranged at the connection between the sub-baffle plate and the shaft assembly. Correspondingly, on the shaft assembly, It can be arranged in the recessed structure matched with the protruding structure, and the recessed structure is arranged at the connection between the shaft assembly and the sub-baffle plate. When the sub-baffle plate and the shaft assembly are connected, the concave structure is fitted and sleeved on the convex structure.

Specifically, since the middle and short shafts have been embedded in the above-mentioned rotor core, the shaft assembly also includes a front short shaft and a rear short shaft, which is the same as the case where the previous shaft assembly only has the front and rear short shafts, the front short shaft and The rear short shaft will be fixed by the above-mentioned convex structure and concave structure.

In addition, when fixing the magnetic isolation baffle, the rotor assembly and the shaft assembly, epoxy glue can be applied to the joint, and the magnetic isolation baffle and the rotor assembly, and the magnetic isolation baffle and the shaft assembly can be fixed by using the glue.

Of course, other fixing methods can also be used, or on the basis of applying epoxy glue, a structural fixing method can be added to improve the strength of the rotor. In order to protect the permanent magnets on the rotor, a sheath 4 can be sheathed on the rotor assembly.

For other fixing methods, please refer to FIG. 3 . FIG. 3 is a schematic diagram of a connection structure between a magnetic isolation baffle and a shaft assembly provided by the present application.

As shown in FIG. 3 , the outer surface of the protruding structure on the magnetic shielding baffle may be provided with a plurality of protruding strips 31 , and the inner surface of the concave structure may be provided with grooves that match the plurality of protruding strips in a one-to-one correspondence. 22. When the concave structure is fitted and sleeved on the convex structure, the groove is inserted into the corresponding convex strip.

With the above-mentioned structure of grooves and protruding strips, when the rotor assembly drives the shaft assembly to rotate through the magnetic isolation baffle, it can rely on the pressure between the grooves and the protruding strips while relying on the tension of the glue, which effectively improves the stability of the rotor structure. The fixed strength between the two can prolong the service life of the rotor.

In addition, in order to reduce the influence of the magnetic shielding baffle on the overall structure of the rotor and the performance of the rotor, the outer diameter of the magnetic shielding shield may be set to the same size as the outer diameter of the rotor assembly. In this way, the structural integrity of the rotor with the magnetic shielding baffle will be higher. Of course, the permanent magnets may be cylindrical and directly sleeved on the rotor iron core, or may be a plurality of arc-shaped permanent magnet pieces attached to the rotor iron core. In order to protect the permanent magnets on the rotor, a sheath 4 can be sheathed on the rotor assembly.

Please refer to FIG. 4 , which is a schematic structural diagram of a motor provided by another embodiment of the present application.

As shown in FIG. 4 , the motor provided in this embodiment may include a stator 401 , a rotor 402 and a stator fixing housing 403 as provided in the above embodiment;

The stator is fixed in the stator fixing casing, and the rotor is sleeved in the stator.

It should be noted that, in this embodiment, the rotor may include: a rotor assembly and a shaft assembly, the rotor assembly includes a rotor iron core and a permanent magnet fixed on the surface of the rotor iron core; the rotor assembly and the shaft assembly A magnetic isolation baffle is fixed therebetween, and the magnetic isolation baffle is used to prevent the magnetic field of the permanent magnet from leaking into the shaft assembly through the rotor iron core.

Specifically, for the specific structure and positional relationship of the magnetic shielding baffle, reference may be made to the specific descriptions in the foregoing embodiments, which will not be repeated here.

Since the rotor in the motor in this embodiment is provided with a magnetic isolation baffle, and the magnetic isolation baffle is arranged between the rotor assembly and the shaft assembly, the shaft assembly cannot be in direct contact with the rotor iron core, which blocks the rotor iron Due to the magnetic path formed when the core is in direct contact with the shaft assembly, the magnetic field of the permanent magnet cannot leak into the shaft assembly through the rotor core, which greatly reduces the magnetic flux leakage of the rotor.

Please refer to FIG. 5 , which is a schematic structural diagram of a motor driving device provided by another embodiment of the present application.

As shown in FIG. 5 , the motor driving device 500 provided in this embodiment may include a load 501 and a motor 502 provided in the above-mentioned embodiment; the motor is used to drive the load to work.

It should be noted that the motor-driven device referred to in this embodiment refers to a device that needs to be driven by a motor, such as a fan, an air compressor, an air-conditioning fan-related device, and the like.

Wherein, the motor may include a stator, a rotor as provided in the above-mentioned embodiments, and a stator-fixing housing;

The stator is fixed in the stator fixing casing, and the rotor is sleeved in the stator.

It should be noted that, in this embodiment, the rotor may include: a rotor assembly and a shaft assembly, the rotor assembly includes a rotor iron core and a permanent magnet fixed on the surface of the rotor iron core; the rotor assembly and the shaft assembly A magnetic isolation baffle is fixed therebetween, and the magnetic isolation baffle is used to prevent the magnetic field of the permanent magnet from leaking into the shaft assembly through the rotor iron core.

Specifically, for the specific structure and positional relationship of the magnetic shielding baffle, reference may be made to the specific descriptions in the foregoing embodiments, which will not be repeated here.

Since the rotor of the motor in the motor drive device in this embodiment is provided with a magnetic isolation baffle, and the magnetic isolation baffle is arranged between the rotor assembly and the shaft assembly, the shaft assembly cannot be in direct contact with the rotor core, blocking the The magnetic path formed when the rotor iron core is in direct contact with the shaft assembly is eliminated, and the magnetic field of the permanent magnet cannot leak into the shaft assembly through the rotor iron core, which greatly reduces the magnetic flux leakage of the rotor.

In the description of this specification, description with reference to the terms "one embodiment", "some embodiments", "specific example", or "some examples" etc. means the specific features, structures, materials described in connection with the embodiment or example Or a feature is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limitations to the present application. Embodiments are subject to variations, modifications, substitutions and variations.

Claims (10)

1. A rotor, characterized in that the rotor comprises: a rotor assembly and a shaft assembly, the rotor assembly comprising a permanent magnet; A magnetic isolation baffle is fixed between the rotor assembly and the shaft assembly, and the magnetic isolation baffle is used to prevent the magnetic field of the permanent magnet from leaking into the shaft assembly. 2 . The rotor according to claim 1 , wherein the magnetic shielding baffle at least comprises a sub-baffle plate disposed at one end of the rotor assembly. 3 . 3 . The rotor according to claim 2 , wherein the ratio of the thickness of the sub-baffle plate along the axial direction to the length of the permanent magnet along the axial direction satisfies a preset ratio range. 4 . 4. The rotor according to claim 3, wherein the preset ratio interval is

5 . The rotor according to claim 2 , wherein a convex structure is provided on the connection between the sub-baffle and the shaft assembly, and the shaft assembly is connected to the sub-baffle. 6 . A concave structure is provided at the connection of the plates, and when the sub-baffle plate is connected with the shaft assembly, the concave structure is fitted and sleeved on the convex structure. 6 . The rotor according to claim 5 , wherein the outer surface of the protruding structure is provided with a plurality of protruding strips, and the inner surface of the concave structure is provided with a one-to-one matching with the plurality of protruding strips. 7 . When the concave structure is fit and sleeved on the protruding structure, the groove is inserted into the corresponding convex strip. 7 . The rotor according to claim 1 , wherein the magnetic isolation baffle and the rotor assembly are fixedly connected by epoxy resin glue, and the magnetic isolation baffle and the shaft assembly are connected between the magnetic isolation baffle and the shaft assembly. 8 . The connection is secured by epoxy glue. 8 . The rotor according to claim 1 , wherein the outer diameter of the rotor assembly is the same as the outer diameter of the magnetic isolation baffle. 9 . 9. A motor, characterized in that the motor comprises a stator, the rotor according to any one of claims 1-8, and a stator-fixed casing; The stator is fixed in the stator fixing casing, and the rotor is sleeved in the stator. 10. A motor drive device, characterized in that it comprises a load and the motor according to claim 9; The motor is used to drive the load to work.

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