Built-in rotor and electric machine comprising same

Abstract

The utility model relates to an embedded rotor, comprising a first permanent magnet which is configured to be a cylinder, is integrally formed, is provided with a plurality of interval grooves along the circumferential direction, and is divided into a plurality of first permanent magnet sub-parts by the interval grooves; a second permanent magnet disposed in the spacing groove; a magnet ring surrounding the first permanent magnet; wherein the first permanent magnet sub-parts have a magnetic field direction extending in the radial direction, and the first permanent magnet sub-parts on both sides of the spacing grooves have opposite magnetic field directions, and wherein the magnetic field direction of the second permanent magnets extends in the circumferential direction, and wherein the magnet ring comprises a plurality of magnet ring sections, the magnetic ring sections respectively have the same magnetic field direction as the corresponding first permanent magnet sub-parts, and the magnetic fields of the second permanent magnets in the interval grooves and the magnetic fields of the first permanent magnets on the two sides of the interval grooves form a continuous magnetic circuit with the shortest path. In addition, the utility model also relates to an electric machine comprising the embedded rotor.

Description

Technical Field

[0001] The utility model relates to an embedded rotor and a motor comprising the embedded rotor. Background Art

[0002] The current embedded rotor is composed of a magnetizer and a permanent magnet, wherein the magnetizer is formed by stacking stamped silicon steel sheets, and the permanent magnet is embedded inside the magnetizer. The silicon steel sheets that make up the magnetizer can be, for example, non-oriented silicon steel sheets or oriented silicon steel sheets. The difference in magnetic permeability or magnetic permeability in each direction of the non-oriented silicon steel sheet is very small, that is, there is no directional difference, while the magnetic permeability or magnetic permeability of the oriented silicon steel sheet in different directions is different, that is, it has excellent magnetic permeability in a specific direction, but poor magnetic permeability in other directions.

[0003] When the magnetizer of the embedded rotor is made of non-oriented silicon steel sheets, the magnetization depth of the magnetizer is not deep enough. When oriented silicon steel sheets are used, the magnetization of the magnetizer will be uneven due to the specific orientation of the silicon steel sheets. In addition, the magnetizer itself is non-magnetic, which results in a waste of rotor space for the magnetizer, making the rotor space not fully utilized and unable to maximize the magnetic flux of the rotor. Utility Model Content

[0004] The utility model provides an embedded rotor, which can effectively increase the magnetization depth of the rotor, thereby improving the performance of the rotor and a motor having the rotor.

[0005] The utility model proposes an embedded rotor, which includes: a first permanent magnet, which is constructed as a cylinder and is integrally formed, and a plurality of spacing grooves are arranged inside the first permanent magnet along the circumferential direction, and the first permanent magnet is divided into a plurality of first permanent magnet sub-portions by the spacing grooves; a second permanent magnet, which is arranged in the spacing grooves; a magnetic ring, which surrounds the first permanent magnet; wherein the first permanent magnet sub-portions have a magnetic field direction extending along the radial direction of the first permanent magnet, and the first permanent magnet sub-portions on both sides of the spacing grooves have opposite magnetic field directions respectively, wherein the magnetic field direction of the second permanent magnet extends along the circumferential direction of the first permanent magnet, wherein the magnetic ring includes a plurality of magnetic ring segments, and the magnetic ring segments respectively have the same magnetic field direction as the corresponding first permanent magnet sub-portions, wherein the magnetic field of the second permanent magnet in the spacing groove together with the magnetic field of the first permanent magnet on both sides of the spacing groove forms a continuous magnetic circuit with the shortest path.

[0006] In an embodiment of the present invention, the outer circumferential surface of the first permanent magnet is a closed surface.

[0007] In an embodiment of the present invention, the spacing groove penetrates the first permanent magnet along the longitudinal direction of the first permanent magnet.

[0008] In an embodiment of the present invention, the magnetic ring is integrally formed.

[0009] In an embodiment of the present invention, the material of the magnetic ring includes samarium cobalt, neodymium iron boron and samarium iron nitrogen.

[0010] In an embodiment of the present invention, the material of the first permanent magnet is plastic ferrite.

[0011] In an embodiment of the present invention, the second permanent magnet is sintered or bonded.

[0012] In an embodiment of the present invention, the second permanent magnet is made of one or more of ferrite, neodymium iron boron, samarium iron nitrogen or samarium cobalt.

[0013] In an embodiment of the present invention, a cross section of the second permanent magnet is configured as a trapezoid.

[0014] In an embodiment of the present invention, the lower base of the trapezoidal cross section is close to the center of the cross section of the first permanent magnet.

[0015] In an embodiment of the present invention, a positioning portion is provided in the spacing groove, and the positioning portion is used to fix the second permanent magnet in the spacing groove.

[0016] In an embodiment of the present invention, the positioning portion is arranged in the spacing groove on one side close to the center of a cross section of the first permanent magnet.

[0017] In an embodiment of the present invention, the positioning portion is configured as a protrusion for abutting against and fixing the second permanent magnet.

[0018] In an embodiment of the present invention, an air slot is provided between the second permanent magnet arranged in the spacing slot and the first permanent magnet on a side facing the center line of the first permanent magnet.

[0019] The utility model also provides a motor, which includes the embedded rotor described above according to the embodiment of the utility model.

[0020] In the prior art, the magnetizer of the rotor is usually formed by stamping and stacking silicon steel sheets. However, the magnetization depth of non-oriented silicon steel sheets is not deep enough overall; the magnetization direction of oriented silicon steel sheets is fixed, so the magnetization depth will be uneven after magnetization. In addition, if silicon steel sheets are manufactured and assembled according to the desired orientation, such as the orientation in the embodiment of the utility model, the manufacturing and assembly process must be complicated and costly.

[0021] Compared with the prior art, the embedded rotor according to the present disclosure adopts a first permanent magnet to replace the magnetizer. The first permanent magnet itself is magnetic and can provide additional magnetic flux. The rotor can therefore provide more magnetic flux, and a synchronous motor with such a rotor can obtain greater power and stronger performance. In the embedded rotor according to the present disclosure, a magnetic field application device, such as a strong magnetic device, can be arranged in the spacing groove in the first permanent magnet to orient and magnetize the first permanent magnet, so that the first permanent magnet obtains a desired magnetic field, for example, a deep orientation depth and magnetization depth in the radial direction of the first permanent magnet. In addition, the integrally formed first permanent magnet and magnetic ring are made of magnetic materials, preferably magnetic materials with low magnetic resistance and good magnetic conductivity can be selected, and the processing technology of the integrally formed first permanent magnet and magnetic ring is simple, material-saving, low-cost, and very suitable for industrial mass production. By arranging the magnetic ring, the magnetism of the rotor can be increased or the amount of strong magnetic material can be reduced while ensuring the magnetism of the rotor and the performance of the motor, thereby reducing costs. The arrangement of the magnetic ring can also increase the mechanical strength of the rotor. In addition, the magnetic ring composed of samarium cobalt, neodymium iron boron or samarium iron nitrogen has strong remanence, high power density, high coercive force, and good anti-demagnetization ability, so it is very suitable for high-power and high-torque motors.

[0022] The best embodiment of the present invention will be described in more detail below in conjunction with the accompanying drawings so that the features and advantages of the present invention can be easily understood. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solution of the embodiment of the utility model, the following is a brief introduction to the drawings required for the description of the embodiment. Obviously, the drawings described below are only some exemplary embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 A three-dimensional diagram of an embedded rotor according to an embodiment of the utility model is shown.

[0025] Figure 2 An exploded perspective view of an embedded rotor according to an embodiment of the utility model is shown.

[0026] Figure 3 A schematic diagram showing the magnetic field direction of the first permanent magnet of the embedded rotor according to an embodiment of the utility model is shown.

[0027] Figure 4 FIG. 1 shows a schematic diagram of the magnetic field direction of the second permanent magnet of the embedded rotor according to an embodiment of the utility model.

[0028] Figure 5 A schematic diagram showing the magnetic field direction of the magnetic ring of the embedded rotor according to an embodiment of the utility model is shown, and

[0029] Figure 6 A schematic diagram of the magnetic circuit of an embedded rotor according to an embodiment of the utility model is shown. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the technical solution of the utility model clearer, the technical solution of the embodiment of the utility model will be clearly and completely described in conjunction with the drawings of the specific embodiments of the utility model. The same figure marks in the drawings represent the same parts. It should be noted that the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the described embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] Compared with the embodiments shown in the drawings, feasible implementations within the scope of protection of the present invention may have fewer components, other components not shown in the drawings, different components, differently arranged components, or differently connected components, etc. In addition, two or more components in the drawings may be implemented in a single component, or a single component shown in the drawings may be implemented as multiple separate components.

[0032] Figure 1 A stereoscopic view of an embedded rotor 100 according to an embodiment of the utility model is schematically shown. The embedded rotor 100 includes a first permanent magnet 110, a second permanent magnet 120 and a magnetic ring 130. The first permanent magnet 110 is configured as a cylinder and is integrally formed. In the utility model, the first permanent magnet 110 is configured as a cylinder, which is particularly understood as the outer contour of the first permanent magnet 110 is a cylinder. In the embodiment according to the utility model, the outer circumferential surface of the first permanent magnet 110 can be, for example, a closed surface. Figure 2 The exploded perspective view of the embedded rotor 100 according to the embodiment of the utility model is schematically shown. Figure 2It can be clearly seen that a plurality of spacing grooves 140 are arranged in the circumferential direction inside the first permanent magnet 110, and the first permanent magnet is divided into a plurality of first permanent magnet sub-portions by the spacing grooves. In an embodiment according to the utility model, the spacing grooves 140 penetrate the first permanent magnet 110 along the longitudinal direction, that is, the axial direction of the first permanent magnet 110. A plurality of second permanent magnets 120 are respectively arranged in the spacing grooves 140, and in particular, are inserted into the spacing grooves 140. The magnetic ring 130 is arranged around the first permanent magnet 110, that is, the magnetic ring 130 surrounds, and in particular, only abuts against, the outer circumferential surface of the first permanent magnet 110.

[0033] During the manufacturing process of the first permanent magnet, the space occupied by the spacing groove is used to place an orientation tool to apply a magnetic field, so that the first permanent magnet sub-portions on both sides of the spacing groove can obtain a deeper orientation depth, in preparation for the subsequent deeper magnetization depth.

[0034] In the prior art, the permanent magnets in the rotor are usually made of high magnetic energy product materials, such as neodymium iron boron. High magnetic energy materials are expensive and have limited magnetization depth. Permanent magnets made of high magnetic energy product materials are usually arranged on a magnetizer in an embedded manner or a surface-mounted manner. The volume of permanent magnets made of high magnetic energy product materials and rotors with such permanent magnets is usually small. In this case, it is necessary to increase the stator or increase the stator coil to increase the power of the synchronous motor. In contrast, in the present disclosure, the first permanent magnet can be made of a material with low magnetic energy product, such as plastic magnets. Plastic magnetic materials are relatively cheap. The deep orientation and magnetization of the first permanent magnet can be achieved through the spacing grooves in the first permanent magnet. Based on these two points, the first permanent magnet can be constructed as large as possible, and the rotor with such a first permanent magnet can provide a stronger magnetic field and more magnetic flux. The rotor according to the present disclosure can achieve the performance of a rotor made of high magnetic energy product materials.

[0035] In the prior art, the rotor of a permanent magnet synchronous motor is composed of a magnetizer and a permanent magnet. The permanent magnet can be attached to the surface of the magnetizer to form a surface-mounted rotor, or the permanent magnet can be inserted into the magnetizer to form an embedded rotor. This type of magnetizer is formed by stamping and stacking silicon steel sheets, so it cannot be manufactured by an integrated molding process.

[0036] Compared with the prior art, a first permanent magnet is used in the rotor according to the present disclosure instead of a magnetizer. The first permanent magnet according to the present disclosure is made of plastic magnetic material by injection molding, and can be very conveniently prepared by an integrated molding process. Compared with the process of stamping and stacking silicon steel sheets, the integrated molding process of the first permanent magnet has a simple process, high efficiency, high precision, and low cost. In addition, the first permanent magnet composed of plastic magnetic material can provide magnetic force itself, and its magnetic permeability is much higher than that of silicon steel material. Therefore, the rotor according to the present disclosure has a deeper magnetization depth, a higher material utilization rate, and a greater power density.

[0037] In this disclosure, the one-piece molding process should be understood as the molding process of the entire part in one mold at one time. Compared with the traditional step-by-step manufacturing process, one-piece molding greatly reduces the cost of part production, has a faster production speed, and can produce various parts, products, tools, etc. in a very short time.

[0038] The one-piece molding process is relatively simple, and the required contours, holes, surface treatments, etc. can be completed in one mold, which can greatly reduce production time and costs, and at the same time improve the production accuracy and repeatability of parts. In the traditional processing method, it is necessary to prepare the mold and template first, and then the parts are processed in steps. The one-piece molding process does not require additional preparation of templates and other requirements, and can truly be completed in one step, greatly improving processing efficiency and speed. In addition, the molds designed by the one-piece molding process are usually produced in one go, so the speed is very fast, and large-scale production can be completed quickly, which can meet market demand more quickly. The one-piece molding process can not only meet the needs of traditional manufacturing fields, but can also be applied to some high-tech fields, such as generators, car wash manufacturing, medical equipment, etc. In these fields, the one-piece molding process can create more precise and higher-quality parts and products.

[0039] The first permanent magnet formed in one piece is made of magnetic material, and preferably a magnetic material with low magnetic resistance and good magnetic conductivity can be selected. In an embodiment according to the present disclosure, the first permanent magnet 110 can be made of plastic ferrite, for example, and can be formed in one step by injection molding. Plastic ferrite has low magnetic resistance, good magnetic conductivity, deep magnetization depth, and is suitable for one-piece molding and industrial production. In an embodiment according to the present disclosure, the plastic ferrite can be a mixture of nylon and ferrite, for example. The first permanent magnet made of plastic ferrite accommodates the second permanent magnet, so the rotor space is fully utilized, so that the rotor can provide a larger magnetic flux without changing the volume. Plastic magnets and ferrites have a smaller density than silicon steel materials, which leads to a reduction in the weight of the rotor made of plastic magnets and ferrites, so the power and energy efficiency of the motor can be improved. In addition, plastic ferrite has a higher resistivity than silicon steel materials, so the rotor made of plastic ferrite can effectively reduce eddy current losses compared to the rotor made of silicon steel materials.

[0040] Figure 3 FIG. 2 shows a schematic diagram of the magnetic field direction of the first permanent magnet 110 of the embedded rotor 100 according to an embodiment of the present utility model. Figure 3 FIG. 4 shows a cross section of an embedded rotor 100 and a first permanent magnet 110 thereof. Figure 3As shown, the first permanent magnet sub-portions 111 and 112 on both sides of one spacing slot 140 have magnetic field directions in opposite directions along the radial direction of the first permanent magnet 110. For example, the magnetic field direction of the first permanent magnet sub-portion 111 is oriented outward along the radial direction of the first permanent magnet 110, and the magnetic field direction of the first permanent magnet sub-portion 112 is oriented inward along the radial direction of the first permanent magnet 110. The magnetic field direction of the first permanent magnet 110 and each of its first permanent magnet sub-portions is the magnetic field direction after magnetization or after the inserted second permanent magnet 120 is magnetized. It should be noted that the orientation direction when orienting the first permanent magnet 110 is consistent with the magnetic field direction of the first permanent magnet 110 and each of its first permanent magnet sub-portions. When the first permanent magnet 110 and each of its first permanent magnet sub-portions are oriented, due to the externally applied oriented magnetic field, each of the first permanent magnet sub-portions of the first permanent magnet will have better magnetic conductivity, that is, higher magnetic permeability and lower magnetic resistance in a specific direction.

[0041] The second permanent magnet 120 is inserted into the spacing slot 140 to provide a magnetic field, and the magnetic field direction of the second permanent magnet 120 is designed so that the first permanent magnet sub-parts 111 and 112 on both sides of one of the spacing slots 140 and the second permanent magnet 120 form the shortest continuous magnetic path. Figure 4 A schematic diagram of the magnetic field direction of the second permanent magnets 121 and 122 of the embedded rotor 100 according to an embodiment of the present utility model is shown. Figure 4 Two adjacent second permanent magnets 121 and 122 are shown as examples. The magnetic field directions of the second permanent magnets 121 and 122 are described below by taking the magnetic field directions of the second permanent magnets 121 and 122 as examples. The magnetic field directions of the other second permanent magnets can be known by comparison through the magnetic field directions of the second permanent magnets 121 and 122. In the embodiment according to the utility model, the magnetic field directions of the second permanent magnets 120, 121 and 122 can extend along the circumferential direction of the first permanent magnet 110, and from Figure 4 It can be seen that the magnetic field directions of the two adjacent second permanent magnets 121 and 122 are opposite. The magnetic field directions of the second permanent magnets 120, 121 and 122 enable the first permanent magnet sub-portions on both sides of an interval slot and the second permanent magnet in the interval slot to form a continuous magnetic circuit with the shortest path. Figure 6In the embodiment according to the utility model, the second permanent magnets 120, 121 and 122 can be made of one or more of ferrite, neodymium iron boron, samarium iron nitrogen and samarium cobalt, for example. The second permanent magnet composed of samarium cobalt, neodymium iron boron or samarium iron nitrogen has strong remanence, high power density, high coercive force, and good anti-demagnetization ability, so it is very suitable for high-power and high-torque motors. In the embodiment according to the utility model, the second permanent magnets 120, 121 and 122 can be sintered or bonded, for example, sintered ferrite. In the case where the second permanent magnet is made of sintered ferrite, the entire rotor does not use rare earth materials at all, so the cost of the rotor is further reduced.

[0042] Figure 5 FIG. 1 shows a schematic diagram of the magnetic field direction of the magnetic ring 130 of the embedded rotor 100 according to an embodiment of the present utility model. Figure 5 As shown in , the magnetic ring 130 includes a plurality of magnetic ring segments. The following only takes the two adjacent magnetic ring segments 131 and 132 as examples to explain their magnetic field directions / orientation directions. The magnetic field directions / orientation directions of the remaining magnetic ring segments can be known by comparison through the magnetic field directions / orientation directions of the magnetic ring segments 131 and 132. The magnetic field direction / orientation direction of the magnetic ring segment 131 is consistent with the magnetic field direction / orientation direction of the first permanent magnet sub-portion 111, that is, it is oriented outwardly in the radial direction of the first permanent magnet 110, and the magnetic field direction / orientation direction of the magnetic ring segment 132 is consistent with the magnetic field direction / orientation direction of the first permanent magnet sub-portion 112, that is, it is oriented inwardly in the radial direction of the first permanent magnet 110. This point is Figure 6 is shown more clearly in.

[0043] In an embodiment according to the utility model, the magnetic ring 130 can be integrally formed, for example, and can be formed in one step by an injection molding method. The processing technology of the integrally formed magnetic ring is simple and low in cost. The integrally formed magnetic ring is made of permanent magnetic material. In an embodiment according to the utility model, the magnetic ring 130 can be constructed, for example, by samarium cobalt, neodymium iron boron or samarium iron nitrogen. By adding the magnetic ring 130, the magnetic force or magnetic field strength of the embedded rotor can be further increased, so that the power of the corresponding motor can be further improved. In addition, in an embodiment according to the utility model, for example, when the first permanent magnet is made of a ferromagnetic material with poor magnetic force such as plastic magnet or ferrite, the magnetic ring 130 can be additionally arranged. On the one hand, the magnetic ring 130 can strengthen the mechanical strength of the rotor. Especially when the rotor volume is large, the arrangement of the magnetic ring is necessary. The reliability, robustness and life of the rotor and the motor are also improved. On the other hand, by adding the magnetic ring 130, the magnetic force of the rotor can be ensured not to be reduced or even increased compared with the rotor using strong magnetic materials. Under the premise of ensuring the performance of the motor, the amount of strong magnetic materials used is reduced and the cost is reduced. In addition, when the magnetic ring is made of samarium cobalt, neodymium iron boron or samarium iron nitrogen, the magnetic ring has strong remanence, high power density, high coercive force, and good anti-demagnetization ability, so it is very suitable for high-power and high-torque motors.

[0044] Viewed from the outside of the embedded rotor according to the present disclosure, the rotor has alternating N poles and S poles and forms a rotor with multiple pole pairs. Inside the embedded rotor according to the present disclosure, the magnetic ring segment and the first permanent magnet sub-portion corresponding to the S pole have a magnetic field direction extending radially inward, and the magnetic ring segment and the first permanent magnet sub-portion corresponding to the N pole have a magnetic field direction extending radially outward. Between adjacent S poles and N poles, the magnetic field starts from the S pole, transitions through the second permanent magnet and reaches the N pole in the shortest path, and the magnetic field in the second permanent magnet extends in the circumferential direction. Specifically, Figure 6 FIG. 1 shows a schematic diagram of the magnetic circuit of the embedded rotor 100 according to an embodiment of the present utility model. Figure 6 As shown, the second permanent magnet 121 and the second permanent magnet 122 are respectively arranged in the corresponding spacing grooves. In addition, the second permanent magnet 123 arranged in the corresponding spacing groove is also shown. The magnetic field direction of the second permanent magnet 123 also extends along the circumferential direction of the first permanent magnet 110 and is opposite to the magnetic field direction of the adjacent second permanent magnet 122. On both sides of the second permanent magnet 122 are the first permanent magnet sub-portions 111 and 112, and on both sides of the second permanent magnet 123 are the first permanent magnet sub-portions 112 and 113. The magnetic ring 130 is arranged around the first permanent magnet 110, and the magnetic ring segment 131 is aligned with the first permanent magnet sub-portion 111, the magnetic ring segment 132 is aligned with the first permanent magnet sub-portion 112, and the magnetic ring segment 133 is aligned with the first permanent magnet sub-portion 113. From Figure 6As can be seen in the figure, the magnetic field starts from the S pole corresponding to the magnetic ring segment 132, extends inwardly in the radial direction of the first permanent magnet 110 in the first permanent magnet sub-portion 112, and then the magnetic field is separated, a part of the magnetic field bends through the second permanent magnet 122, and the other part of the magnetic field bends through the second permanent magnet 123. The magnetic field extends counterclockwise in the circumferential direction of the first permanent magnet 110 in the second permanent magnet 122, and the magnetic field bends after passing through the second permanent magnet 122 and extends outwardly in the radial direction of the first permanent magnet 110 through the first permanent magnet sub-portion 111 and the magnetic ring segment 131, reaching the N pole corresponding to the magnetic ring segment 131. The magnetic field extends clockwise in the circumferential direction of the first permanent magnet 110 in the second permanent magnet 123, and the magnetic field bends after passing through the second permanent magnet 123 and extends outwardly in the radial direction of the first permanent magnet 110 through the first permanent magnet sub-portion 113 and the magnetic ring segment 133, reaching the N pole corresponding to the magnetic ring segment 133. Based on the above description of the magnetic field directions and courses in the first permanent magnet sub-portions 111 , 112 and 113 , the second permanent magnets 122 and 123 and the magnetic ring segments 131 , 132 and 133 , the magnetic field directions and courses in other first permanent magnet sub-portions, second permanent magnets and magnetic ring segments can be understood by comparison.

[0045] Compared with the prior art, the embedded rotor according to the present disclosure adopts a first permanent magnet to replace the magnetizer. The first permanent magnet itself is magnetic and can provide additional magnetic flux. The rotor can therefore provide more magnetic flux, and the synchronous motor with such a rotor can obtain greater power and stronger performance. In the embedded rotor according to the present disclosure, a magnetic field application device, such as a strong magnetic device, can be arranged in the spacing groove in the first permanent magnet to orient and magnetize the first permanent magnet, so that the first permanent magnet obtains a desired magnetic field, for example, a deep orientation depth and magnetization depth in the radial direction of the first permanent magnet. In addition, the first permanent magnet and the magnetic ring of the embedded rotor according to the embodiment of the utility model can be integrally formed, so that it can be manufactured in a material-saving manner, and because the manufacturing process is simple, it is very suitable for industrial mass production.

[0046] In an embodiment of the present invention, the first permanent magnet 110, the second permanent magnet 120 and the magnetic ring 130 are oriented and magnetized to form the magnetic field direction of the first permanent magnet, the second permanent magnet and the magnetic ring. It should be noted that the orientation direction when the first permanent magnet 110, the second permanent magnet 120 and the magnetic ring 130 are oriented is consistent with the magnetic field direction of the first permanent magnet 110, the second permanent magnet 120 and the magnetic ring 130, for example Figures 3 to 6 The magnetic field directions shown in are consistent.

[0047] In the embodiment according to the present invention, the cross-section of the second permanent magnet 120 and the cross-section of the spacing groove 140 matched therewith can be configured into any shape, such as a triangle, a quadrilateral, other polygons, a circle, and the like.

[0048] In an embodiment of the present invention, the cross section of the second permanent magnet 120 may be configured as a trapezoid, for example. Figures 1 to 5 In addition, in the embodiment according to the present invention, the lower base of the trapezoidal cross section is close to the center of the cross section of the first permanent magnet 110, and the upper base of the trapezoidal cross section is close to the circumference of the cross section of the first permanent magnet 110. The second permanent magnet 120 constructed with a trapezoidal cross section can make the magnetic field pass more through the first permanent magnet, thereby reducing magnetic leakage.

[0049] In an embodiment according to the present utility model, Figure 1 and Figure 3 As shown in , for example, a positioning portion 151 can be provided in the spacing groove 140, and the positioning portion 151 is used to fix the second permanent magnet 120 in the spacing groove 140. In an embodiment according to the utility model, the positioning portion 151 is arranged in the spacing groove 140 on one side of the center of the cross section of the first permanent magnet 110 close to the first permanent magnet 110. In an embodiment according to the utility model, the positioning portion 151 is configured as a protrusion for abutting against the permanent magnet, and the protrusion can be configured as a triangle or a semicircle, for example. The size of the spacing groove 140 of the first permanent magnet 110 is larger than that of the second permanent magnet 120, so that the second permanent magnet 120 can be more easily inserted into the spacing groove 140, so it is necessary to provide a positioning portion 151 so as to fix the second permanent magnet 120 in the spacing groove 140.

[0050] In an embodiment according to the present utility model, Figure 1 and Figure 3 As shown in the figure, the second permanent magnet 120 arranged in the spacing slot 140 is provided with an air slot 152 between the first permanent magnet 110 and the side facing the center line of the first permanent magnet 110. The air slot 152 can be formed naturally when the positioning portion 151 is provided, that is, after the second permanent magnet 120 is inserted into the spacing slot 140, a gap is formed between the second permanent magnet 120 and the first permanent magnet 110 due to the larger size of the spacing slot. Since air has a very low magnetic permeability, the air slot 152 can reduce magnetic leakage.

[0051] The utility model also provides a motor, which includes the embedded rotor according to the utility model, and can be, for example, a synchronous motor, a brushless DC motor, etc.

[0052] In the embodiment of the utility model, when manufacturing the first permanent magnet 110, the second permanent magnet 120 and the magnetic ring 130, only orientation is performed on them, but no magnetization is performed. After the first permanent magnet 110, the second permanent magnet 120 and the magnetic ring 130 are assembled, that is, after the second permanent magnet 120 is inserted into the spacing groove 140 of the first permanent magnet 110 and the magnetic ring 130 is arranged around the first permanent magnet 110, the first permanent magnet 110, the second permanent magnet 120 and the magnetic ring 130 are magnetized. The orientation direction of the first permanent magnet 110, the second permanent magnet 120 and the magnetic ring 130 is the same as that of the first permanent magnet 110, the second permanent magnet 120 and the magnetic ring 130. Figures 3 to 6 The magnetic field directions of the first permanent magnet 110, the second permanent magnet 120 and the magnetic ring 130 shown in the figure are consistent, and when the first permanent magnet 110, the second permanent magnet 120 and the magnetic ring 130 are magnetized, the magnetization direction is consistent with the corresponding orientation direction. The magnetized embedded rotor is formed into the embedded rotor according to the embodiment of the utility model.

[0053] In this document, unless otherwise defined, the technical terms or scientific terms used herein shall have the usual meanings understood by persons with ordinary skills in the field to which the utility model belongs. The words "first", "second" and similar words used in the patent application specification and claims of the utility model do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "one" do not necessarily indicate quantity restrictions. Words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0054] The exemplary implementation scheme of the scheme proposed in the utility model is described in detail above with reference to the preferred embodiments. However, it can be understood by those skilled in the art that, without departing from the concept of the utility model, various modifications and variations can be made to the above-mentioned specific embodiments, and various technical features and structures proposed in the utility model can be combined in various ways without exceeding the protection scope of the utility model, which is determined by the attached claims.

Claims

1. An embedded rotor, characterized in that: The embedded rotor comprises: A first permanent magnet, which is configured as a cylinder and is integrally formed, and has a plurality of spacing grooves arranged in a circumferential direction inside the first permanent magnet, and the first permanent magnet is divided into a plurality of first permanent magnet sub-portions by the spacing grooves; a second permanent magnet, the second permanent magnet being arranged in the spacing slot; A magnetic ring, the magnetic ring surrounding the first permanent magnet; The first permanent magnet sub-portion has a magnetic field direction extending along the radial direction of the first permanent magnet, and the first permanent magnet sub-portions on both sides of the spacing slot have opposite magnetic field directions respectively. The magnetic field direction of the second permanent magnet extends along the circumferential direction of the first permanent magnet. The magnetic ring includes a plurality of magnetic ring segments, each of which has the same magnetic field direction as the corresponding first permanent magnet sub-portion. The magnetic field of the second permanent magnet in the spacing slot and the magnetic field of the first permanent magnet on both sides of the spacing slot together form a continuous magnetic circuit with the shortest path.

2. The embedded rotor according to claim 1, characterized in that: The outer circumferential surface of the first permanent magnet is a closed surface.

3. The embedded rotor according to claim 1, characterized in that: The spacing groove penetrates the first permanent magnet along a longitudinal direction of the first permanent magnet.

4. The embedded rotor according to claim 1, characterized in that: The magnetic ring is integrally formed.

5. The embedded rotor according to claim 1, characterized in that: The material of the magnetic ring includes samarium cobalt, neodymium iron boron and samarium iron nitrogen.

6. The embedded rotor according to claim 1, characterized in that: The material of the first permanent magnet is plastic ferrite.

7. The embedded rotor according to claim 1, characterized in that: The second permanent magnet is sintered or bonded.

8. The embedded rotor according to claim 1, characterized in that: The second permanent magnet is made of one or more of ferrite, neodymium iron boron, samarium iron nitrogen or samarium cobalt.

9. The embedded rotor according to claim 1, characterized in that: The cross section of the second permanent magnet is configured to be trapezoidal.

10. The embedded rotor according to claim 9, characterized in that: The lower base of the trapezoidal cross section is close to the center of the cross section of the first permanent magnet.

11. The embedded rotor according to claim 1, characterized in that: A positioning portion is provided in the spacing groove, and the positioning portion is used to fix the second permanent magnet in the spacing groove.

12. The embedded rotor according to claim 11, characterized in that: The positioning portion is arranged in the spacing groove on one side close to the center of a cross section of the first permanent magnet.

13. The embedded rotor according to claim 11 or 12, characterized in that: The positioning portion is configured as a protrusion for abutting against and fixing the second permanent magnet.

14. The embedded rotor according to claim 13, characterized in that: An air slot is provided between the second permanent magnet disposed in the spacing slot and the first permanent magnet on a side facing the center line of the first permanent magnet.

15. An electric machine comprising an inline rotor according to any one of the preceding claims.

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