Rotor and motor

Abstract

The application relates to the technical field of motors, in particular to a rotor and a motor. The rotor is arranged on the inner circumferential side of a stator of the motor, and comprises a rotor core and a magnetic unit. The material of the rotor core is a non-magnetic conductive material, and a plurality of fixing grooves are arranged on the rotor core and are distributed along the circumferential direction of the rotor core. The magnetic unit is arranged in the fixing grooves, and the magnetic unit comprises a permanent magnet and a magnetic conductor. In the same magnetic unit, the permanent magnet is located on the same side of the magnetic conductor in the circumferential direction of the rotor core, and the end of the permanent magnet close to the magnetic conductor is of the same type of magnetic pole. The magnetic field generated by the excitation of the stator can complete the closure of the magnetic flux through the magnetic conductor, the magnetic potential difference formed by the magnetic permeance difference of the magnetic circuit can generate a drag torque F1, and the magnetic potential difference formed by the magnetic field generated by the excitation of the stator and the magnetic field of the permanent magnet can generate a drag torque F2. The resultant force of the drag torque F1 and the drag torque F2 can drive the rotor to rotate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, in particular to a rotor and an electric machine. BACKGROUND

[0002] With the continuous improvement of electric machine theory, new electric machine design theories such as permanent magnet electric machines and reluctance electric machines have emerged. Permanent magnet electric machines not only have the advantages of small size and high efficiency, but also have great development space in the high-speed field. Reluctance electric machines are a new electric machine design theory emerging in recent years, which effectively breaks the dependence on rare resources such as rare earths. However, the reluctance electric machine is based on the slotting of the core as a magnetic barrier for operation. SUMMARY

[0003] The purpose of the present application is to provide a new electric machine structure form different from permanent magnet synchronous electric machines and synchronous reluctance electric machines.

[0004] In a first aspect, an embodiment of the present application provides a rotor arranged on an inner circumferential side of a stator of an electric machine, the rotor comprising:

[0005] A rotor core made of a non-magnetic material, a plurality of fixed slots being arranged on the rotor core and spaced apart along a circumferential direction of the rotor core;

[0006] A magnetic unit arranged in the fixed slot, the magnetic unit comprising a permanent magnet and a magnetic conductor, in the same magnetic unit, the permanent magnet is located on the same side of the magnetic conductor in the circumferential direction of the rotor core, and the end of the permanent magnet close to the magnetic conductor is the same type of magnetic pole.

[0007] In a possible implementation, the permanent magnet is one of a magnetic steel, a neodymium iron boron permanent magnet, a samarium cobalt permanent magnet and a ferrite permanent magnet.

[0008] In a possible implementation, the magnetic conductor is iron, cobalt or nickel.

[0009] In a possible implementation, the length of the magnetic conductor in the circumferential direction of the rotor core is 4-8 times the length of the permanent magnet in the circumferential direction of the rotor core.

[0010] In a possible implementation, the length of the magnetic conductor in the circumferential direction of the rotor core is 6 times the length of the permanent magnet in the circumferential direction of the rotor core.

[0011] In a possible implementation, in the same magnetic unit, the magnetic field direction of the permanent magnet is consistent with the extension direction of the magnetic conductor.

[0012] In a possible implementation, the material of the rotor core is a non-metallic material.

[0013] In a possible implementation, the rotor core is manufactured by glass sintering, injection molding, or powder die casting.

[0014] In a possible implementation, the fixing groove is opened on the circumferential surface of the rotor core.

[0015] In a second aspect, an embodiment of the present application provides a permanent magnet motor, comprising:

[0016] shaft;

[0017] The rotor provided in the first aspect is sleeved on the rotating shaft; and

[0018] The stator is arranged on the outer peripheral side of the rotor.

[0019] According to the rotor and motor provided in the embodiments of the present application, the rotor is arranged on the inner circumference of the stator of the motor, and the rotor includes a rotor core and a magnetic unit. The rotor core is made of non-magnetic material, and a plurality of fixed slots spaced along its own circumferential direction are provided on the rotor core. The magnetic unit is arranged in the fixed slot, and the magnetic unit includes a permanent magnet and a magnet. The stator magnetic field has no force on the rotor core. The magnetic field generated by the stator excitation can complete the closure of the magnetic flux through the magnet. The magnetic potential difference formed by the difference in magnetic permeability of the magnetic circuit is used to generate a drag torque F1. At the same time, the magnetic potential difference formed by the magnetic field generated by the stator excitation and the permanent magnet magnetic field can generate a drag torque F2. The combined force of the drag torque F1 and the drag torque F2 can drive the rotor to rotate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without inventive work. In addition, in the drawings, the same reference numerals are used for the same components, and the drawings are not drawn according to the actual scale.

[0021] Figure 1 A schematic structural diagram of a rotor core in a rotor provided in an embodiment of the present application is shown;

[0022] Figure 2 A schematic structural diagram of a rotor provided in an embodiment of the present application is shown;

[0023] Figure 3 A schematic diagram showing the structure of the rotor, stator and rotating shaft provided in an embodiment of the present application; and

[0024] Figure 4 Show Figure 3 Schematic diagram of the forces in the structure shown.

[0025] Description of reference numerals:

[0026] 100, rotor; 110, rotor core; 120, magnetic unit; 121, permanent magnet; 122, magnetic conductor; 130, fixing slot; 140, hoop; 150, shaft hole;

[0027] 200, stator;

[0028] 300. Shaft. DETAILED DESCRIPTION

[0029] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0030] The present application provides a rotor 100 , which is used to be disposed on the inner circumference of a stator 200 of a motor. The rotor 100 includes a rotor core 110 and a magnetic unit 120 .

[0031] As shown in the figure, the rotor core 110 is made of a non-magnetic material and is provided with a plurality of fixed slots 130. The plurality of fixed slots 130 are evenly distributed on the rotor core 110 around the rotation axis of the rotor core 110, that is, the rotor core 110 is provided with a plurality of fixed slots 130 spaced apart along its own circumferential direction. The number of fixed slots 130 is usually an even number. In this embodiment, four fixed slots 130 are arranged in a circular array on the rotor core 110. A group of magnetic units 120 are installed in each fixed slot 130, and the magnetic unit 120 includes a permanent magnet 121 and a conductive magnet 122 arranged in a continuous manner. The magnetic units 120 are arranged in a one-to-one correspondence with the fixed slots 130, that is, a magnetic unit 120 is provided in each fixed slot 130.

[0032] After the rotor 100 and the stator 200 in the above embodiment are assembled to form a motor, after the winding in the stator 200 is energized, the excitation of the stator 200 will form a rotating electromagnetic field. Since the material of the rotor core 110 is non-magnetic material, the magnetic field of the stator 200 has no force on the rotor core 110. The magnetic field generated by the excitation of the stator 200 can complete the closure of the magnetic flux through the magnetizer 122, and the magnetic potential difference formed by the magnetic permeability difference of the magnetic circuit is used to generate a drag torque F1. At the same time, the magnetic potential difference formed by the magnetic field generated by the excitation of the stator 200 and the magnetic field of the permanent magnet 121 can generate a drag torque F2. The combined force of the drag torque F1 and the drag torque F2 can pull the rotor 100, thereby realizing the rotation of the motor rotor 100.

[0033] Optionally, within the same magnetic unit 120, the permanent magnets 121 are located on the same side of the magnetizers 122 in the circumferential direction of the rotor core 110. For example, in the rotor 100 shown in the figure, within the same magnetic unit 120, the permanent magnets 121 and the magnetizers 122 are arranged in a clockwise direction in the circumferential direction of the rotor core 110, that is, the permanent magnets 121 are always located counterclockwise of the magnetizers 122. In this way, the magnetic unit 120 can utilize the attractive force of the permanent magnets 121 to increase the drag torque.

[0034] Optionally, within each magnetic unit 120, the ends of the permanent magnets 121 proximate to the magnetizer 122 have the same type of magnetic poles. For example, in the rotor 100 shown in the figure, the counterclockwise side of each permanent magnet 121 has an S pole, the clockwise side has an N pole, and the end of each permanent magnet 121 proximate to the magnetizer 122 has an N pole. This allows each permanent magnet 121, after being acted upon by the excitation magnetic field of the stator 200, to generate a drag torque F2 in either a counterclockwise or a clockwise direction, thereby facilitating more efficient rotation of the rotor 100. Of course, in the rotor 100 in other embodiments, the counterclockwise side of each permanent magnet 121 can be set to be an N pole, and the clockwise side can be an S pole, and the end of each permanent magnet 121 close to the magnetizer 122 can be an S pole. As long as it can cooperate with the excitation magnetic field of the stator 200 to form a drag torque in the same direction, technical personnel in this field can make specific selections and designs based on the specific structure of the stator 200 and the requirements of the rotation direction.

[0035] In some embodiments, the permanent magnet 121 may be an alloy permanent magnet or a ferrite permanent magnet. For example, the alloy permanent magnet may be a rare earth permanent magnet, i.e., neodymium iron boron permanent magnet (Nd2Fe14B), samarium cobalt permanent magnet (SmCo), or aluminum nickel cobalt permanent magnet (AlNiCo). AlNiCo is preferably used, as it has excellent properties of high remanence, low temperature coefficient, and stable magnetic properties.

[0036] In some embodiments, the magnetic conductor 122 can be iron, cobalt or nickel, and the material of the magnetic conductor 122 is preferably iron in consideration of the material cost and the magnetic performance. The magnetic conductor 122 is embedded in the rotor core 110 in a closed loop according to the magnetic flux, so that the magnetic field generated by the excitation of the stator 200 can complete the closure of the magnetic flux through the magnetic conductor 122, and the magnetic potential difference formed by the magnetic circuit difference can generate the drag torque F1 to provide power for the rotation of the rotor 100.

[0037] In some embodiments, in the same magnetic unit 120, the magnetic field direction of the permanent magnet 121 is consistent with the extension direction of the magnetic conductor 122. In the most ideal state, the magnetic field direction of the permanent magnet 121 is the same as the extension direction of the magnetic conductor 122, at this time, the magnetic field direction of the permanent magnet 121 is approximately parallel to the geometric center line of the magnetic conductor 122, and is approximately parallel to the direction of the cross section of the rotor core 110 at the corresponding position, so that the torque generated by the magnetic field of the permanent magnet 121 and the magnetic field of the magnetic conductor 122 under the action of the excitation magnetic field of the stator 200 can be completely used for the rotation of the rotor 100. In the case where the magnetic field direction of the permanent magnet 121 cannot be completely consistent with the extension direction of the magnetic conductor 122, the angle between the magnetic field direction of the permanent magnet 121 and the extension direction of the magnetic conductor 122 should be as small as possible.

[0038] In the actual manufacturing process, the cross section of the magnetic conductor 122 and the permanent magnet 121 is usually designed as a fan ring shape, and the center of the fan ring is located on the rotation axis of the rotor core 110. At this time, due to the existence of the arc, the magnetic field direction of the permanent magnet 121 cannot be completely consistent with the extension direction of the magnetic conductor 122. In order to make the magnetic field direction of the permanent magnet 121 consistent with the extension direction of the magnetic conductor 122 as much as possible or as parallel as possible, the length of the magnetic conductor 122 along the circumference of the rotor core 110 is 4-8 times the length of the permanent magnet 121 along the circumference of the rotor core 110. In addition, this ratio can also reduce the proportion of the permanent magnet 121 and reduce the weight of the magnetic unit 120, thereby optimizing the performance of the rotor 100. Most preferably, the length of the magnetic conductor 122 along the circumference of the rotor core 110 is 6 times the length of the permanent magnet 121 along the circumference of the rotor core 110.

[0039] In some embodiments, the material of the rotor core 110 is a non-magnetic non-metallic material, a glass material or an injection molding material, including but not limited to resin, glass steel, aluminum and the like. The specific preparation process of the rotor core 110 includes but is not limited to glass sintering, injection molding or powder die casting. The material of the rotor core 110 is preferably an injection molding material or a glass material, which can abandon the traditional iron core structure on the basis of realizing non-magnetic, has a lower density, greatly reduces the weight of the rotor core 110, improves the power density of the motor, and also ensures the stable operation of the motor at high speed.

[0040] In some embodiments, the fixing groove 130 is opened on the circumferential surface of the rotor core 110, i.e. the fixing groove 130 penetrates the circumferential surface of the rotor core 110, and the cross-sectional shape of the fixing groove 130 is preferably the same as the cross-sectional shape of the magnetic unit 120, for example, the cross-sectional shape of the fixing groove 130 and the cross-sectional shape of the magnetic unit 120 can both be fan ring shapes. The magnetic unit 120 can be fixed in the fixing groove 130 by bonding, and the magnetic unit 120 can also be bound in the fixing groove 130 by externally sleeving the ring 140 on the rotor core 110.

[0041] In some embodiments, the rotor core 110 includes a plurality of rotor laminations stacked along the axial direction, each of the rotor laminations has a plurality of fixing grooves 130 distributed along the circumferential direction of the rotor lamination.

[0042] The application also separately protects an electric machine, which includes a rotating shaft 300, a rotor 100, and a stator 200, wherein the rotor 100 has a shaft hole 150, the rotor 100 is sleeved on the rotating shaft 300 through the shaft hole 150, and the stator 200 is arranged on the outer circumferential side of the rotor 100. The rotor 100 in the electric machine is the rotor 100 in the foregoing embodiments of the application, and the specific structure, working mode, and technical effects can be referred to the rotor 100 embodiments provided by the embodiments of the application, which will not be described here.

[0043] It can be understood that the technical solutions of the electric machine and the rotor 100 thereof provided by the embodiments of the application can be applied to electronic devices such as but not limited to compressors, air conditioners, wind power generators, and the like, which will not be described here. It should be pointed out that in the specification, “one embodiment”, “embodiment”, “exemplary embodiment”, “some embodiments” and the like mean that the described embodiments can include a specific feature, structure or property, but not necessarily every embodiment includes the specific feature, structure or property. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when a specific feature, structure or property is described in combination with an embodiment, it is within the knowledge of those skilled in the art to realize such feature, structure or property in combination with other embodiments described explicitly or implicitly.

[0044] It should be readily understood that “on”, “above” and “over” in the present disclosure should be interpreted in the broadest way, such that “on” means not only “directly on”, but also includes the meaning of “on” with intermediate features or layers therebetween, and “above” or “over” includes not only the meaning of “above” or “over”, but also the meaning of “above” or “over” without intermediate features or layers therebetween (i.e. directly on).

[0045] Additionally, spatially relative terms, such as "below," "beneath," "beneath," "above," and the like, may be used herein for ease of description to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. The device may be in other orientations (rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein should be interpreted accordingly.

[0046] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A rotor, arranged on the inner circumference side of a stator (200) of a motor, characterized in that: The rotor (100) comprises: The rotor core (110) is made of a non-metallic material and a non-magnetic material, and the rotor core (110) is provided with a plurality of fixing slots (130) spaced apart along its circumferential direction; A magnetic unit (120) is arranged in the fixing slot (130), and the magnetic unit (120) includes a permanent magnet (121) and a magnetizer (122). In the same magnetic unit (120), the permanent magnet (121) is located on the same side of the magnetizer (122) in the circumferential direction of the rotor core (110), and the end of the permanent magnet (121) close to the magnetizer (122) is the same type of magnetic pole. The length of the magnetizer (122) along the circumferential direction of the rotor core (110) is 6 times the length of the permanent magnet (121) along the circumferential direction of the rotor core (110).

2. The rotor according to claim 1, characterized in that The permanent magnet (121) is one of magnetic steel, neodymium iron boron permanent magnet, samarium cobalt permanent magnet and ferrite permanent magnet.

3. The rotor according to claim 1, characterized in that The magnetic conductor (122) is iron, cobalt or nickel.

4. The rotor according to claim 1, characterized in that In the same magnetic unit (120), the magnetic field direction of the permanent magnet (121) is consistent with the extension direction of the magnetic conductor (122).

5. The rotor according to claim 1, characterized in that The rotor core (110) is manufactured through glass sintering, injection molding or powder die casting processes.

6. The rotor according to claim 1, characterized in that The fixing groove (130) is opened on the circumferential surface of the rotor core (110).

7. A motor, characterized in that: include: AXIS(300); The rotor (100) according to any one of claims 1 to 6, sleeved on the rotating shaft (300); and The stator (200) is arranged on the outer peripheral side of the rotor (100).

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