CN212304926U - 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

Rotor, motor and motor drive device

Technical Field

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

Background

At present, rotors of motors are generally divided into a built-in rotor and a surface-mounted rotor according to different fixing modes of permanent magnets, the built-in rotor generally reserves a permanent magnet groove on an iron core so as to embed the permanent magnets into the permanent magnet groove, and the surface-mounted rotor attaches the permanent magnets to the iron core. In order to increase the force output by the motor shaft, a magnetic 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 so as to rotate synchronously with the rotation of the rotor, which causes the permanent magnet to form a magnetic path with the shaft through the iron core, resulting in leakage of magnetic flux.

In order to reduce the magnetic leakage of the rotor, for the built-in rotor, magnetic isolation bridges are generally arranged at two ends of a permanent magnet slot to increase the magnetic resistance, but the surface-mounted rotor does not have a permanent magnet slot, and the magnetic isolation bridges cannot be used in the surface-mounted rotor, so that the magnetic leakage of the surface-mounted rotor cannot be reduced.

SUMMERY OF THE UTILITY MODEL

To overcome, at least to some extent, the problems in the related art, the present application provides a rotor, a motor, and a motor driving apparatus.

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 comprising a permanent magnet;

and a magnetic isolation baffle is fixedly arranged between the rotor assembly and the shaft assembly and is used for preventing magnetic flux lines of the permanent magnets from leaking into the shaft assembly.

Optionally, the magnetism isolating baffle at least comprises a sub baffle arranged at one end of the rotor assembly.

Optionally, a ratio of the thickness of the sub-baffle along the axial direction to the length of the permanent magnet along the axial direction meets a preset proportional interval.

Optionally, the preset proportion interval is

Optionally, protruding structures are arranged at the joints of the sub-baffles and the shaft assemblies, recessed structures are arranged at the joints of the sub-baffles and the shaft assemblies, and the sub-baffles and the shaft assemblies are connected through the recessed structures.

Optionally, the surface of protruding structure is provided with a plurality of sand grips, the internal surface of sunk structure be provided with the recess that a plurality of sand grips one-to-one match, the sunk structure laminating cover is established when protruding structure is last, the recess inserts correspondingly in the sand grip.

Optionally, the magnetism isolating baffle is fixedly connected with the rotor assembly through epoxy resin glue, and the magnetism isolating baffle is fixedly connected with the shaft assembly through epoxy resin glue.

Optionally, the outer diameter of the rotor assembly is the same as that of the magnetism isolating baffle.

According to a second aspect of the present application, there is provided an electric machine comprising: a stator, a rotor according to the first aspect of the present application and a stator stationary housing;

the stator is fixed in the stator fixing shell, and the rotor is sleeved in the stator.

According to a third aspect of the present application, there is provided a motor driving apparatus including a load and the motor of the third aspect of the present application;

the motor is used for driving the load to work.

The technical scheme provided by the application can comprise the following beneficial effects: the rotor all can include rotor subassembly and axle subassembly generally, and wherein, the rotor subassembly includes the permanent magnet, in order to avoid the magnetic field of permanent magnet to leak the axle subassembly, this application is fixed to be set up between rotor subassembly and axle subassembly and separates the magnetic shield, because the existence that separates the magnetic shield, 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.

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

Drawings

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

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

FIG. 2 is a schematic axial cross-sectional view of another rotor provided herein;

FIG. 3 is a schematic view of a connection structure between a magnetic shield and a shaft assembly provided by the present application;

fig. 4 is a schematic structural diagram of an electric machine according to another embodiment of the present application;

fig. 5 is a schematic structural diagram of a motor driving apparatus according to another embodiment of the present application.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus consistent with certain aspects of the present application, as detailed in the appended claims.

At present, rotors of motors are generally divided into a built-in rotor and a surface-mounted rotor according to different fixing modes of permanent magnets, the built-in rotor generally reserves a permanent magnet groove on an iron core so as to embed the permanent magnets into the permanent magnet groove, and the surface-mounted rotor attaches the permanent magnets to the iron core. In order to increase the force output by the motor shaft, a magnetic 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 so as to rotate synchronously with the rotation of the rotor, which causes the permanent magnet to form a magnetic path with the shaft through the iron core, resulting in leakage of magnetic flux.

In order to reduce the magnetic leakage of the rotor, for the built-in rotor, magnetic isolation bridges are generally arranged at two ends of a permanent magnet slot to increase the magnetic resistance, but the surface-mounted rotor does not have a permanent magnet slot, and the magnetic isolation bridges cannot be used in the surface-mounted rotor, so that the magnetic leakage of the surface-mounted rotor cannot be reduced.

It should be noted that the solution of the present application may be based on a rotor of a shaft assembly using a magnetically conductive material (e.g. 40CrNiMoA) in order to lift the rotor bearing out forces. The axle subassembly adopts magnetic materials to effectively promote the output of rotor bearing, but can face the condition that the magnetic field of permanent magnet reveals through the axle subassembly, consequently, in order to reduce the volume of magnetic leakage, utilizes to separate magnetic baffle and keep apart rotor subassembly and axle subassembly.

Referring to fig. 1, fig. 1 is a schematic axial cross-sectional view of a rotor according to an embodiment of the present application.

As shown in fig. 1, the rotor provided in the present embodiment may include: a rotor assembly and shaft assembly 2, the rotor assembly comprising permanent magnets 11;

and a magnetic isolation baffle plate 3 is fixedly arranged between the rotor assembly and the shaft assembly and is used for preventing the magnetic field of the permanent magnet from leaking into the shaft assembly.

In this embodiment, the rotor includes rotor subassembly and axle subassembly, and wherein, the rotor subassembly includes the permanent magnet, in order to avoid the magnetic field of permanent magnet to leak the axle subassembly, this application is fixed between rotor subassembly and axle subassembly to set up and separates the magnetic shield, because the existence that separates the magnetic shield, 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.

It should be noted that, in the present embodiment, the structure of the magnetic shielding plate may be changed in many ways, which may be adapted according to the structure of the rotor. In general, the rotor assembly of the rotor may include only one permanent magnet, and in this case, the shape of the permanent magnet may be, but is not limited to, a solid cylinder, and more, the rotor assembly in the rotor may include a rotor core and a permanent magnet fixed on the surface of the rotor core, and the shaft assembly may include only the front short shaft and the rear short shaft, and may include the front short shaft, the middle short shaft and the rear short shaft. Of course, the shaft assembly and rotor assembly are configured in mating relationship to form a complete rotor. In the following, the rotor assembly is described as including a rotor core and permanent magnets, in which the rotor core and the permanent magnets together form a solid cylinder or a cylinder.

For the rotor with the shaft assembly only comprising the front short shaft and the rear short shaft, that is, only comprising the front short shaft and the rear short shaft, in the existing structure, the rotor core in the rotor assembly of the rotor is solid, and the front short shaft and the rear short shaft are directly fixed at two ends of the rotor core, that is, directly fixed at two ends of the rotor assembly, for the structure, in this embodiment, the magnetic isolation baffle may comprise at least one sub-baffle, and if only one sub-baffle is provided, the magnetic isolation baffle may be disposed at any end of the rotor assembly, specifically, between the rotor assembly and the front short shaft or between the rotor core and the rear short shaft; if two sub-baffles are provided, the two sub-baffles can be respectively arranged at the two ends of the rotor assembly, so that the front short shaft and the rear short shaft are respectively separated from the rotor assembly.

In the case where the shaft assembly includes only the front and rear short shafts, in order to more effectively reduce the amount of leakage magnetic flux, the ratio of the thickness of the sub-barriers in the axial direction to the length of the permanent magnets in the axial direction of the rotor core may be set to any one value in a preset proportional interval. Since the shape of the rotor core, the front short axis and the rear short axis in the rotor is generally a rotating body structure, such as a cylinder or a plurality of cylinders with different diameters of the bottom surface (in fig. 1, the front short axis and the rear short axis are a plurality of cylinders with different diameters of the bottom surface), the rotating body structure has a central axis, and in this embodiment, the axial direction is a direction along the central axis.

Specifically, the ratio of the thickness of the sub-baffle plate in the axial direction to the length of the permanent magnet in the axial direction of the rotor core can satisfy a preset proportional interval, and the proportional interval can be

Because the longer the permanent magnet length, the more its magnetic field energy is also big, consequently, can follow the length of permanent magnet, adapt to and increase the thickness of sub-baffle, as long as guarantee that the thickness of sub-baffle is better the ratio of the length of permanent magnet satisfies above-mentioned preset proportion interval can.

In addition, in actual production life, the specification of the rotor generally needs to meet certain standards in the industry, and therefore, the size specification of each constituent structure in the rotor generally is within a certain range, that is, the length of the permanent magnet in the rotor is often fixed, and the lengths of the permanent magnets in most of the rotors are the same, so that a preset thickness interval is further provided in the embodiment. Specifically, the predetermined thickness interval may be between 10 mm and 30 mm.

It should be noted that the thickness of the sub-baffle is the thickness along the axial direction of the shaft assembly, and the length of the permanent magnet is the length along the axial direction of the rotor core. The material of the magnetic shield according to the present embodiment may be, but is not limited to, SUS 304.

In addition, there is a rotor shaft assembly including a front stub shaft, a middle stub shaft and a rear stub shaft, wherein the middle stub shaft is generally embedded in a rotor core, the front stub shaft is fixed to one end of the middle stub shaft, and the rear stub shaft is fixed to the other end of the middle stub shaft to form a complete shaft. For this type of rotor, it is also possible to use the above-described method with only the front and rear short shafts, i.e. to provide a sub-baffle 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 front short shaft, the middle short shaft and the rear short shaft, a magnetic isolation baffle plate can be arranged between the middle short shaft and the rotor core. Referring to fig. 2, fig. 2 is a schematic structural view of another rotor provided in the present application.

As shown in fig. 2, when the shaft assembly of the rotor includes the middle short shaft 21, the rotor core is generally cylindrical, and the central cylinder is embedded in the middle short shaft, so as to avoid the contact between the rotor core and the middle short shaft, the magnetic shielding plate may be set to be cylindrical, the middle short shaft is embedded in the cylindrical magnetic shielding plate, and then the magnetic shielding plate embedded with the middle short shaft is embedded in the rotor core, so as to prevent the magnetic field of the permanent magnet from leaking into the shaft assembly through the rotor core.

In addition, in order to facilitate installation of the magnetic isolation baffles at the two ends of the middle and short shaft, a middle and short shaft protrusion 211 is respectively arranged at the two ends of the middle and short shaft, a middle and short shaft recess 212 is correspondingly arranged at the position, contacted with the middle and short shaft, of the magnetic isolation baffles at the two ends of the middle and short shaft, the magnetic isolation baffles at the two ends are fixed at the two ends of the middle and short shaft after the magnetic isolation baffles embedded with the middle and short shaft are embedded in the rotor core, and at the moment, the middle and short shaft protrusion is embedded in the middle and short shaft recess.

In this embodiment, when fixing the axle subassembly on magnetism baffle, need guarantee that the installation is accomplished the back, the center pin of axle subassembly and rotor subassembly is on same straight line, because the existence of magnetism baffle, the location of counter shaft subassembly is comparatively difficult, in order to realize the quick location installation of counter shaft subassembly, can set up a protruding structure on sub-baffle, this protruding structure sets up in the junction of sub-baffle and axle subassembly, it is corresponding, on the axle subassembly, can set up in the sunk structure that this protruding structure matches, this sunk structure sets up the junction at axle subassembly and sub-baffle. When the sub-baffle is connected with the shaft assembly, the concave structure is fitted and sleeved on the convex structure.

Specifically, since the middle stub shaft is already embedded in the above-mentioned rotor core, the shaft assembly further includes a front stub shaft and a rear stub shaft, which are fixed by the above-mentioned protruding structures and recessed structures, as in the case of the shaft assembly having only the front and rear stub shafts.

In addition, when the magnetism isolating baffle, the rotor assembly and the shaft assembly are fixed, epoxy resin glue can be coated at the connecting position, and the magnetism isolating baffle and the rotor assembly and the magnetism isolating baffle and the shaft assembly are fixed by the glue.

Of course, other fixing modes can be adopted, or a structural fixing mode is added on the basis of coating the epoxy resin glue, so that the strength of the rotor is improved. In order to protect the permanent magnets on the rotor, a sheath 4 may be provided over the rotor assembly.

Other fixing manners can refer to fig. 3, and fig. 3 is a schematic view of a connection structure between the magnetic shielding baffle and the shaft assembly provided by the present application.

As shown in fig. 3, the outer surface of the protruding structure on the magnetic isolation baffle plate may be provided with a plurality of protruding strips 31, the inner surface of the recessed structure may be provided with grooves 22 matched with the plurality of protruding strips in a one-to-one correspondence manner, the recessed structure is fitted and sleeved with the protruding structure, and the grooves are inserted into the corresponding protruding strips.

By utilizing the structure of the grooves and the convex strips, when the rotor assembly drives the shaft assembly to rotate through the magnetism isolating baffle, the pressure between the grooves and the convex strips can be relied on when the tension of glue is relied on, the fixing strength between the rotor structures is effectively improved, and the service life of the rotor is prolonged.

In addition, in order to reduce the influence of the magnetism isolating baffle plate on the whole structure and the performance of the rotor, the outer diameter of the magnetism isolating baffle plate can be set to be the same as the outer diameter of the rotor assembly. In this way, the rotor having the magnetism-isolating barrier is more structurally integrated. Of course, the permanent magnet may be cylindrical and directly sleeved on the rotor core, or may be a plurality of arc-shaped permanent magnet pieces attached to the rotor core. In order to protect the permanent magnets on the rotor, a sheath 4 may be provided over the rotor assembly.

Referring to fig. 4, fig. 4 is a schematic structural diagram of a motor according to another embodiment of the present disclosure.

As shown in fig. 4, the motor provided in the present embodiment may include a stator 401, a rotor 402 and a stator fixing case 403 as provided in the above embodiments;

the stator is fixed in the stator fixing shell, and the rotor is sleeved in the stator.

In this embodiment, the rotor may include: the rotor assembly comprises a rotor core and a permanent magnet fixed on the surface of the rotor core; the rotor assembly with be provided with between the axle subassembly fixedly and separate the magnetic baffle, it is used for preventing to separate the magnetic baffle the magnetic field of permanent magnet passes through rotor core leaks to in the axle subassembly.

Specifically, the specific structure and the positional relationship of the magnetic shielding plate can refer to the specific description in the foregoing embodiments, and are not repeated herein.

Because the rotor in the motor in this embodiment has set up and has separated magnetic baffle, and should separate the magnetic baffle setting between rotor subassembly and axle subassembly, consequently, the axle subassembly can't with rotor core direct contact, the magnetic path that forms when having blocked rotor core and axle subassembly direct contact, the magnetic field of permanent magnet just can't leak the axle subassembly through rotor core in, greatly reduced the magnetic leakage volume of rotor.

Referring to fig. 5, fig. 5 is a schematic structural diagram of a motor driving apparatus according to another embodiment of the present application.

As shown in fig. 5, the motor driving device 500 provided in the present embodiment may include a load 501 and a motor 502 provided in the above-described embodiment; the motor is used for driving the load to work.

It should be noted that the motor driving 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 can comprise a stator, a rotor and a stator fixing shell provided in the above embodiment;

the stator is fixed in the stator fixing shell, and the rotor is sleeved in the stator.

In this embodiment, the rotor may include: the rotor assembly comprises a rotor core and a permanent magnet fixed on the surface of the rotor core; the rotor assembly with be provided with between the axle subassembly fixedly and separate the magnetic baffle, it is used for preventing to separate the magnetic baffle the magnetic field of permanent magnet passes through rotor core leaks to in the axle subassembly.

Specifically, the specific structure and the positional relationship of the magnetic shielding plate can refer to the specific description in the foregoing embodiments, and are not repeated herein.

Because the rotor of motor has set up the magnetic shield among the motor drive equipment in this embodiment, and should separate the magnetic shield setting between rotor subassembly and axle subassembly, consequently, the axle subassembly can't with rotor core direct contact, the magnetic path that forms when having blocked rotor core and axle subassembly direct contact, the magnetic field of permanent magnet just can't reveal the axle subassembly through rotor core in, greatly reduced the magnetic leakage volume of rotor.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above 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 embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.

Claims (10)

1. A rotor, comprising: a rotor assembly and a shaft assembly, the rotor assembly comprising a permanent magnet;

and a magnetic isolation baffle is fixedly arranged between the rotor assembly and the shaft assembly and is used for preventing the magnetic field of the permanent magnet from leaking into the shaft assembly.

2. The rotor of claim 1 wherein said magnetic shield comprises at least a sub-shield disposed at one end of said rotor assembly.

3. The rotor of claim 2, wherein a ratio of a thickness of the sub-barriers in the axial direction to a length of the permanent magnets in the axial direction satisfies a preset proportional interval.

4. A rotor according to claim 3, wherein the predetermined proportion interval is

5. The rotor according to any one of claims 2 to 4, wherein a convex structure is arranged at the joint of the sub-baffle plate and the shaft assembly, a concave structure is arranged at the joint of the shaft assembly and the sub-baffle plate, 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 of claim 5, wherein the outer surface of the protruding structure is provided with a plurality of protruding strips, the inner surface of the recessed structure is provided with grooves corresponding to the protruding strips in a one-to-one manner, and when the recessed structure is fitted and sleeved on the protruding structure, the grooves are inserted into the corresponding protruding strips.

7. The rotor of any one of claims 1-4, wherein the magnetic shield is fixedly connected with the rotor assembly by epoxy glue, and the magnetic shield is fixedly connected with the shaft assembly by epoxy glue.

8. The rotor of any one of claims 1-4, wherein an outer diameter of the rotor assembly is the same as an outer diameter of the magnetic shield.

9. An electrical machine comprising a stator, a rotor according to any one of claims 1 to 8 and a stator stationary housing;

the stator is fixed in the stator fixing shell, and the rotor is sleeved in the stator.

10. A motor drive apparatus characterized by comprising a load and a motor according to claim 9;

the motor is used for driving the load to work.

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