Disclosure of Invention
The disclosure provides an embedded rotor which can effectively improve magnetizing depth of the rotor, so that performance of the rotor and a motor with the rotor is improved.
The disclosure provides an embedded rotor, which comprises a first permanent magnet, a second permanent magnet and a magnetic field applying device, wherein the first permanent magnet is configured as a cylinder and is integrally formed, a plurality of spacing grooves are arranged in the first permanent magnet along the circumferential direction, the first permanent magnet is divided into a plurality of first permanent magnet sub-parts by the spacing grooves, the second permanent magnet is arranged in the spacing grooves, the spacing grooves are used for accommodating the magnetic field applying device in the orientation and magnetization process, so that the first permanent magnet obtains permanent magnetism, the first permanent magnet sub-parts have magnetic field directions extending along the radial direction of the first permanent magnet, and the first permanent magnet sub-parts at the two sides of the spacing grooves respectively have opposite magnetic field directions, the magnetic field directions of the second permanent magnet extend along the circumferential direction of the first permanent magnet, and the magnetic field of the second permanent magnet in the spacing grooves and the magnetic field of the first permanent magnet at the two sides of the spacing grooves form a continuous magnetic circuit with the shortest path.
In an embodiment according to the present disclosure, the outer circumferential surface of the first permanent magnet is a closed surface.
In an embodiment according to the present disclosure, the spacing groove penetrates the first permanent magnet in a longitudinal direction of the first permanent magnet.
In an embodiment according to the present disclosure, the material of the first permanent magnet is a plastic magnetic ferrite.
In an embodiment according to the present disclosure, the second permanent magnet is sintered or bonded.
In an embodiment according to the present disclosure, the second permanent magnet is manufactured from one or more of ferrite, neodymium iron boron, samarium iron nitrogen, and samarium cobalt.
In an embodiment according to the present disclosure, the cross section of the second permanent magnet is configured as a trapezoid.
In an embodiment according to the present disclosure, the lower base of the trapezoidal cross section is close to the center of the cross section of the first permanent magnet.
In an embodiment according to the present disclosure, a positioning portion for fixing the second permanent magnet in the spacing groove is provided in the spacing groove.
In an embodiment according to the present disclosure, the positioning portion is arranged at a side of the center of the cross section of the first permanent magnet within the space groove.
In an embodiment according to the present disclosure, the positioning portion is configured as a protrusion for abutting and fixing the second permanent magnet.
In an embodiment according to the present disclosure, the second permanent magnet disposed in the space groove is provided with an air groove between a side facing the center line of the first permanent magnet and the first permanent magnet.
The disclosure also proposes a motor comprising the embedded rotor according to the embodiments of the disclosure above.
The present disclosure also proposes a method for manufacturing an in-line rotor, the method comprising manufacturing a first permanent magnet configured as a cylinder and integrally molded, inside the first permanent magnet, a plurality of spacing grooves arranged in a circumferential direction, the first permanent magnet being divided into a plurality of first permanent magnet sub-portions by the spacing grooves, arranging a first magnetic field applying means in the spacing grooves, and orienting the first permanent magnet such that the first permanent magnet sub-portions on both sides of the spacing grooves have respective orientations in opposite directions in a radial direction of the first permanent magnet, manufacturing a second permanent magnet, orienting the second permanent magnet such that the orientation of the second permanent magnet extends in a circumferential direction of the first permanent magnet, arranging the second permanent magnet in the spacing grooves, magnetizing the first permanent magnet and the second permanent magnet according to the orientation of the first permanent magnet and the orientation of the second permanent magnet such that a shortest continuous magnetic path is formed by the magnetic fields of the second permanent magnet in the spacing grooves and the first magnetic paths on both sides of the spacing grooves.
In an embodiment according to the present disclosure, manufacturing the first permanent magnet includes integrally manufacturing the first permanent magnet by injection molding.
The present disclosure also proposes a method for manufacturing an in-line rotor, the method comprising manufacturing a first permanent magnet, wherein the first permanent magnet is configured as a cylinder and is integrally molded, a plurality of spacing grooves are arranged in a circumferential direction inside the first permanent magnet, the first permanent magnet is divided into a plurality of first permanent magnet sub-portions by the spacing grooves, a first magnetic field applying device is arranged in the spacing grooves, and the first permanent magnet is oriented such that the first permanent magnet sub-portions on both sides of the spacing grooves have respective orientations in opposite directions in a radial direction of the first permanent magnet, magnetizing the first permanent magnet according to the orientation of the first permanent magnet, manufacturing a second permanent magnet, orienting the second permanent magnet such that the orientation of the second permanent magnet extends in the circumferential direction of the first permanent magnet, magnetizing the second permanent magnet according to the orientation of the second permanent magnet, arranging the second permanent magnet in the spacing grooves, wherein both sides of the second permanent magnet in the spacing grooves form a shortest continuous magnetic path together with the first permanent magnet of the spacing grooves.
In the prior art, the magnetizer of the rotor is usually formed by stamping and stacking silicon steel sheets. However, the magnetization depth of the unoriented silicon steel sheet is not deep enough as a whole, and the magnetic conduction direction of the oriented silicon steel sheet is fixed, so that the magnetization depth is not uniform after the magnetization. Furthermore, if the silicon steel sheet is manufactured and assembled according to a desired orientation, for example, the orientation in the embodiments of the present disclosure, the manufacturing and assembling process thereof is necessarily complicated and costly.
Compared with the prior art, the embedded rotor disclosed by the invention adopts a first permanent magnet to replace a magnetizer. The first permanent magnet itself is magnetic and is capable of providing additional magnetic flux. The rotor is thus able to provide more magnetic flux and a synchronous machine with such a rotor can achieve more power and stronger performance. In the in-line rotor according to the present disclosure, a magnetic field applying device, such as a strong magnetic device, may be disposed in the spaced grooves in the first permanent magnet so as to orient and magnetize the first permanent magnet, thereby obtaining a desired magnetic field for the first permanent magnet, such as having a deep orientation depth and magnetization depth in a radial direction of the first permanent magnet. In addition, the integrally formed first permanent magnet is formed by magnetic materials, preferably magnetic materials with low magnetic resistance and good magnetic conductivity can be selected, and the integrally formed first permanent magnet is simple in processing technology, material-saving, low in cost and very suitable for industrial mass production.
Preferred embodiments for carrying out the present disclosure will be described in more detail below with reference to the attached drawings so that the features and advantages of the present disclosure can be easily understood.
Detailed Description
In order to make the objects, technical solutions and advantages of the technical solutions of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings of the specific embodiments of the present disclosure. Like reference numerals in the drawings denote like parts. It should be noted that the described embodiments are some, but not all embodiments of the present disclosure. All other embodiments, which can be made by one of ordinary skill in the art without the need for inventive faculty, are within the scope of the present disclosure, based on the described embodiments of the present disclosure.
Possible implementations within the scope of the present disclosure may have fewer components, have other components not shown in the drawings, different components, differently arranged components, differently connected components, etc., than the examples shown in the drawings. Furthermore, two or more of the elements in the figures may be implemented in a single element or a single element shown in the figures may be implemented as multiple separate elements.
Fig. 1 schematically illustrates a perspective view of an in-line rotor 100 according to an embodiment of the present disclosure. The in-line rotor 100 includes a first permanent magnet 110 and a second permanent magnet 120. The first permanent magnet 110 is configured as a cylinder and is integrally formed. In the present disclosure, the first permanent magnet 110 is configured as a cylinder, in particular understood as meaning that the outer contour of the first permanent magnet 110 is a cylinder. In the embodiment according to the present disclosure, the outer circumferential surface of the first permanent magnet 110 may be, for example, a closed surface, thereby obtaining better structural strength. Fig. 2 schematically illustrates an exploded perspective view of the in-line rotor 100 according to an embodiment of the present disclosure. As is apparent from fig. 2, a plurality of spacing grooves 130 are arranged in the circumferential direction inside the first permanent magnet 110, which is divided into a plurality of first permanent magnet sub-portions by the spacing grooves. In the embodiment according to the present disclosure, the interval groove 130 penetrates the first permanent magnet 110 in the longitudinal direction, i.e., the axial direction of the first permanent magnet 110. A plurality of second permanent magnets 120 are respectively arranged in the spacing grooves 130, in particular inserted into the spacing grooves 130.
In the process of manufacturing the first permanent magnet, the space occupied by the spacing groove is used for placing an orientation tool to apply a magnetic field, so that the first permanent magnet sub-parts on two sides of the spacing groove can obtain deeper orientation depth, and preparation is made for obtaining deeper magnetizing depth later.
In the prior art, the permanent magnets in the rotor are typically made of high magnetic energy product materials, such as neodymium iron boron. High magnetic energy materials are costly and have limited magnetizing depths. Permanent magnets made of high magnetic energy product materials are typically arranged on the magnetic conductors in an embedded or surface-mounted manner. Permanent magnets made of high magnetic energy product materials and rotors having such permanent magnets are typically small in volume. 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 may be made of a material of low magnetic energy product, such as plastic magnet. The plastic magnetic material is relatively inexpensive. The depth orientation and magnetizing of the first permanent magnet may be achieved by the spaced slots in the first permanent magnet. Based on these two points, the first permanent magnet can be configured as large as possible, and a rotor with such a first permanent magnet can provide a stronger magnetic field as well as more magnetic flux. The rotor according to the present disclosure can achieve the performance of a rotor made of a high magnetic energy product material.
In the prior art, the rotor of a permanent magnet synchronous motor consists of a magnetizer and a permanent magnet. The permanent magnets may be attached to the surface of the magnetizer to constitute a surface-mounted rotor, or the permanent magnets may be inserted into the magnetizer and constitute an embedded rotor. The magnetizer of this form is stamped and stacked from silicon steel sheets, and thus cannot be manufactured by an integral molding process.
In contrast to the prior art, a first permanent magnet is employed instead of a magnetizer in the rotor according to the present disclosure. The first permanent magnet is formed by injection molding of a plastic magnetic material, and can be conveniently prepared through an integral molding process. Compared with the stamping and stacking process of the silicon steel sheets, the integrated forming process of the first permanent magnet has the advantages of simple flow, high efficiency, high precision and low cost. In addition, the first permanent magnet made of plastic magnetic material can provide magnetic force, and the magnetic permeability of the first permanent magnet is far higher than that of the silicon steel sheet magnetizer. Therefore, the rotor according to the present disclosure has deeper magnetizing depth, higher material utilization, and greater power density.
In the present disclosure, an integral molding process is understood to be a process in which the entire part is molded in one mold at a time. Compared with the traditional step-by-step operation manufacturing process, the integrated forming greatly reduces the cost of part production, has higher production speed, and can produce various parts, products, tools and the like in a short time.
The integrated forming process is relatively simple, the required profile, holes, surface treatment and the like can be finished in one die, the production time and cost can be greatly reduced, and meanwhile, the production precision and repeatability of the parts can be improved. In the conventional processing method, preparation work of a die and a template is needed first, and then the parts are processed step by step. The integrated forming process is adopted without the requirement of additionally preparing templates and the like, so that the process is really completed in one step, and the processing efficiency and the processing speed are greatly improved. In addition, the die designed by the integral molding process is usually produced at one time, so that the speed is very high, mass production can be rapidly finished, and market demands can be more rapidly met. The integrated forming process not only can meet the requirements of the traditional manufacturing field, but also can be applied to some high and new fields, such as generators, car washing manufacturing, medical appliances and the like. In these areas, the integrated process can create more precise, higher quality parts and products.
The integrally formed first permanent magnet is formed of a magnetic material, preferably a magnetic material having low magnetic resistance and good magnetic permeability. In an embodiment according to the present disclosure, the first permanent magnet 110 may be made of, for example, plastic magnetic ferrite, for example, one-shot molded by an injection molding method. The plastic magnetic ferrite has low magnetic resistance, good magnetic permeability and deep magnetizing depth, and is suitable for integrated forming and industrial production. In embodiments according to the present disclosure, the plastic magnetic ferrite may be, for example, a mixture of nylon and ferrite. The first permanent magnet made of plastic magnetic ferrite accommodates the second permanent magnet, and the rotor space is thus fully utilized, so that the rotor can provide a larger magnetic flux without changing the volume. The plastic magnetic ferrite has a smaller density than the silicon steel material, which results in a reduction in weight of a rotor made of the plastic magnetic ferrite, and thus power and energy efficiency of the motor can be improved. In addition, the plastic magnetic ferrite has higher resistivity than the silicon steel material, so that the rotor made of the plastic magnetic ferrite can effectively reduce eddy current loss compared with the rotor made of the silicon steel material.
Fig. 3 illustrates a schematic view of the magnetic field direction of the first permanent magnet 110 of the in-line rotor 100 according to an embodiment of the present disclosure. As shown in fig. 3, showing a cross section of the in-line rotor 100 and its first permanent magnets 110, as shown in fig. 3, the first permanent magnet sub-portions 111 and 112 on both sides of one of the spacing grooves 130 have opposite magnetic field directions along the radial direction of the first permanent magnets 110. For example, the magnetic field direction of the first permanent magnet sub-portion 111 is oriented outwardly in the radial direction of the first permanent magnet 110, and the magnetic field direction of the first permanent magnet sub-portion 112 is oriented inwardly in the radial direction of the first permanent magnet 110. The first permanent magnet 110 and its respective first permanent magnet sub-portions have a magnetic field direction that is magnetized or magnetized by the inserted second permanent magnet 120. It is noted that the orientation direction when the first permanent magnet 110 is oriented coincides with the magnetic field direction of the first permanent magnet 110 and its respective first permanent magnet subsection. When the first permanent magnet 110 and its respective first permanent magnet sub-portions are oriented, the respective first permanent magnet sub-portions of the first permanent magnet will have better magnetic permeability, i.e. higher magnetic permeability and lower magnetic reluctance, respectively, in a specific direction due to the externally applied orientation magnetic field.
The second permanent magnet 120 is inserted into the spaced slots 130 to provide a magnetic field, and the magnetic field direction of the second permanent magnet 120 is designed such that the first permanent magnet sub-portions 111 and 112 on both sides of one of the spaced slots 130 and the second permanent magnet 120 form a continuous magnetic circuit having the shortest path. Fig. 4 illustrates a schematic view of the magnetic field directions of the second permanent magnets 121 and 122 of the in-line rotor 100 according to an embodiment of the present disclosure.
Fig. 4 exemplarily shows two adjacent second permanent magnets 121 and 122. The magnetic field directions of the second permanent magnets 121 and 122 will be described below by taking the second permanent magnets 121 and 122 as an example, and the magnetic field directions of the remaining second permanent magnets can be known comparably. In the embodiment according to the present disclosure, the magnetic field directions of the second permanent magnets 120, 121, and 122 may extend in the circumferential direction of the first permanent magnet 110, and as can be seen from fig. 4, the magnetic field directions of the adjacent two second permanent magnets 121 and 122 are opposite. The direction of the magnetic field of the second permanent magnets 120, 121 and 122 is such that the first permanent magnet sub-portions on both sides of one of the spaced slots and the second permanent magnet in the spaced slot form a continuous magnetic circuit with the shortest path. This is shown more clearly in fig. 5. In an embodiment according to the present disclosure, the material of the second permanent magnets 120, 121, and 122 may include 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 coercivity and good demagnetizing resistance, so that the second permanent magnet is very suitable for high-power and high-torque motors. In an embodiment according to the present disclosure, the second permanent magnets 120, 121 and 122 may be sintered or bonded, for example, may be sintered ferrite. In the case where the second permanent magnet is made of sintered ferrite, the entire rotor is completely free of rare earth material, and thus the cost of the rotor is further reduced.
From the outside of the in-line rotor according to the present disclosure, the rotor has alternating N-poles and S-poles and forms a rotor with multipole pairs. Inside the embedded rotor according to the present disclosure, the first permanent magnet subsection corresponding to the S-pole has a magnetic field direction extending radially inward, and the first permanent magnet subsection corresponding to the N-pole has 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 with the shortest path and reaches the N-pole, the magnetic field in the second permanent magnet extending in the circumferential direction. Specifically, fig. 5 shows a schematic magnetic circuit diagram of the in-line rotor 100 according to an embodiment of the present disclosure. As shown in fig. 5, the second permanent magnet 121 is arranged into the spacing groove 131, the second permanent magnet 122 is arranged into the spacing groove 132, and furthermore, the second permanent magnet 123 is shown arranged in the spacing groove 133. The magnetic field direction of the second permanent magnet 123 extends in 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 either side of the second permanent magnet 122 or the spacing groove 132 are first permanent magnet sub-portions 111 and 112 and on either side of the second permanent magnet 123 or the spacing groove 133 are first permanent magnet sub-portions 112 and 113. As can be seen from fig. 5, the magnetic field extends inwardly in the radial direction of the first permanent magnet 110 in the first permanent magnet subsection 112 starting from the corresponding S pole of the first permanent magnet subsection 112. The magnetic fields are then split, with one part of the magnetic field bending through the second permanent magnet 122 and the other part of the magnetic field bending through the second permanent magnet 123. The magnetic field extends counterclockwise in the second permanent magnet 122 along the circumferential direction of the first permanent magnet 110, 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 subsection 111 to the corresponding N-pole of the first permanent magnet subsection 111. The magnetic field extends clockwise in the circumferential direction of the first permanent magnet 110 in the second permanent magnet 123, 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 subsection 113 to the corresponding N-pole of the first permanent magnet subsection 113. The direction and orientation of the magnetic fields in the other first and second permanent magnets subsection 111, 112 and 113 and the second permanent magnets 122 and 123 may be known comparably based on the above description of the direction and orientation of the magnetic fields in the first and second permanent magnets.
In the prior art, the magnetizer of the rotor is usually formed by stamping and stacking silicon steel sheets. However, the magnetization depth of the unoriented silicon steel sheet is not deep enough as a whole, and the magnetic conduction direction of the oriented silicon steel sheet is fixed, so that the magnetization depth is not uniform after the magnetization. Furthermore, if the silicon steel sheet is manufactured and assembled according to a desired orientation, for example, the orientation in the embodiments of the present disclosure, the manufacturing and assembling process thereof is necessarily complicated and costly.
Compared with the prior art, the embedded rotor disclosed by the invention adopts a first permanent magnet to replace a magnetizer. The first permanent magnet itself is magnetic and is capable of providing additional magnetic flux. The rotor is thus able to provide more magnetic flux and a synchronous machine with such a rotor can achieve more power and stronger performance. In the in-line rotor according to the present disclosure, a magnetic field applying device, such as a strong magnetic device, may be disposed in the spaced grooves in the first permanent magnet so as to orient and magnetize the first permanent magnet, thereby obtaining a desired magnetic field for the first permanent magnet, such as having a deep orientation depth and magnetization depth in a radial direction of the first permanent magnet. In addition, the integrally formed first permanent magnet is formed by magnetic materials, preferably magnetic materials with low magnetic resistance and good magnetic conductivity can be selected, and the integrally formed first permanent magnet is simple in processing technology, material-saving, low in cost and very suitable for industrial mass production.
In the embodiment according to the present disclosure, the cross section of the second permanent magnet 120 and the cross section of the interval groove 130 mated thereto may be configured in any shape, for example, a triangle, a quadrangle, other polygons, a circle, and the like.
In an embodiment according to the present disclosure, the cross section of the second permanent magnet 120 may be configured as a trapezoid, for example. As shown in fig. 1 to 5. Further, in the embodiment according to the present disclosure, 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 in a trapezoidal cross section may allow the magnetic field to pass more through the first permanent magnet, thereby reducing leakage.
In an embodiment according to the present disclosure, as shown in fig. 1 and 3, a positioning portion 141 may be provided, for example, within the spacing groove 130, the positioning portion 141 being used to fix the second permanent magnet 120 in the spacing groove 130. In an embodiment according to the present disclosure, the positioning part 141 is disposed at a side of the center of the cross section of the first permanent magnet 110 within the interval groove 130. In an embodiment according to the present disclosure, the positioning portion 141 is configured as a protrusion for abutting against the second permanent magnet, and the protrusion may be configured as a triangle or a semicircle, for example. The size of the interval slot 130 of the first permanent magnet 110 is larger than that of the second permanent magnet 120 in order to insert the second permanent magnet 120 into the interval slot 130 more easily, and thus it is necessary to provide a positioning portion 141 in order to fix the second permanent magnet 120 in the interval slot 130.
In the embodiment according to the present disclosure, as shown in fig. 1 and 3, the second permanent magnet 120 disposed in the space groove 130 is provided with an air groove 142 between a side facing the center line of the first permanent magnet 110 and the first permanent magnet 110. The air groove 142 may be naturally formed, for example, in the case where the positioning portion 141 is provided, that is, after the second permanent magnet 120 is inserted into the spacing groove 130, a gap is formed between the second permanent magnet 120 and the first permanent magnet 110 due to the large size of the spacing groove. Since air has a very low magnetic permeability, the air slot 142 can reduce magnetic leakage.
The present disclosure also proposes a motor comprising the above-described in-line rotor according to the present disclosure. The motor may be, for example, a synchronous motor, a brushless dc motor, or the like.
The present disclosure also proposes a method for manufacturing an embedded rotor. Fig. 6 illustrates a flow chart of a method 600 for manufacturing an embedded rotor according to an embodiment of the present disclosure. The method 600 for manufacturing an in-line rotor shown in fig. 6 includes manufacturing a first permanent magnet, which is configured as a cylinder and is integrally formed, inside which a plurality of spacing grooves are arranged in a circumferential direction, the first permanent magnet being divided into a plurality of first permanent magnet sub-portions by the spacing grooves (step S610), arranging a first magnetic field applying device in the spacing grooves, and orienting the first permanent magnet such that the first permanent magnet sub-portions on both sides of the spacing grooves have opposite orientations in a radial direction of the first permanent magnet, respectively (step S620), manufacturing a second permanent magnet (step S630), orienting the second permanent magnet such that the orientation of the second permanent magnet extends in the circumferential direction of the first permanent magnet (step S640), arranging the second permanent magnet in the spacing grooves (step S650), magnetizing the first permanent magnet and the second permanent magnet such that the first permanent magnet and the second permanent magnet form a continuous magnetic path of the first permanent magnet on both sides of the spacing grooves together with the first magnetic field path of the first permanent magnet. (step S660). It is to be noted that the orientation directions of the first permanent magnet and the second permanent magnet are identical to the magnetic field directions of the first permanent magnet after being magnetized as shown in fig. 3 and 5, and that when the first permanent magnet and the second permanent magnet are magnetized, the magnetization directions are identical to the orientation directions of the first permanent magnet and the second permanent magnet. The magnetized embedded rotor is formed into the embedded rotor according to the embodiment of the disclosure.
In the method for manufacturing the in-line rotor according to the embodiment of the present disclosure, since the first permanent magnet and the second permanent magnet have been previously oriented, the first permanent magnet and the second permanent magnet have better magnetic permeability in the orientation direction, and thus the magnetic circuits of the first permanent magnet and the second permanent magnet generally and thus may have better magnetizing depth when magnetizing is performed later.
In an embodiment according to the present disclosure, the first permanent magnet may be manufactured integrally, for example, by injection molding. The integrated first permanent magnet has simple processing technology and low cost. The first permanent magnet may be manufactured integrally, for example, using a magnetic material. Preferably, a magnetic material with low magnetic resistance and good magnetic permeability can be selected. In an embodiment according to the present disclosure, the first permanent magnet may be manufactured by plastic magnet, for example. The plastic magnetic material has low magnetic resistance, good magnetic permeability and deep magnetizing depth, and is suitable for integrated forming and industrial production.
The present disclosure also proposes another method for manufacturing an embedded rotor. Fig. 7 illustrates a flow chart of a method 700 for manufacturing an in-line rotor according to another embodiment of the present disclosure. The method 700 for manufacturing an in-line rotor shown in fig. 7 includes manufacturing a first permanent magnet, which is configured as a cylinder and is integrally molded, inside which a plurality of spacing grooves are arranged in a circumferential direction, the first permanent magnet being divided into a plurality of first permanent magnet sub-portions by the spacing grooves (step S710), arranging a first magnetic field applying device in the spacing grooves, and orienting the first permanent magnet such that the first permanent magnet sub-portions on both sides of the spacing grooves have opposite orientations in a radial direction of the first permanent magnet, respectively (step S720), magnetizing the first permanent magnet according to the orientation of the first permanent magnet (step S730), manufacturing a second permanent magnet (step S740), orienting the second permanent magnet such that the orientation of the second permanent magnet extends in the circumferential direction of the first permanent magnet (step S750), magnetizing the second permanent magnet according to the orientation of the second permanent magnet (step S760), and arranging the second permanent magnet in the spacing grooves (step S770). The magnetic field of the second permanent magnet in the interval slot and the magnetic field of the first permanent magnet at the two sides of the interval slot form a continuous magnetic circuit with the shortest path. Note that, in the case where the orientation directions of the first permanent magnet and the second permanent magnet are identical to the magnetic field directions of the first permanent magnet after being magnetized as shown in fig. 3 and 5, and in the case where the first permanent magnet and the second permanent magnet are magnetized, the magnetization directions are identical to the orientation directions of the first permanent magnet and the second permanent magnet. The magnetized embedded rotor is formed into the embedded rotor according to the embodiment of the disclosure.
In the method for manufacturing the in-line rotor according to the embodiment of the present disclosure, since the first permanent magnet and the second permanent magnet have been previously oriented, the first permanent magnet and the second permanent magnet have better magnetic permeability in the orientation direction, and thus the magnetic circuits of the first permanent magnet and the second permanent magnet generally and thus may have better magnetizing depth when magnetizing is performed later.
In an embodiment according to the present disclosure, the first permanent magnet may be manufactured integrally, for example, by injection molding. The integrated first permanent magnet has simple processing technology and low cost. The first permanent magnet may be manufactured integrally, for example, using a magnetic material. Preferably, a magnetic material with low magnetic resistance and good magnetic permeability can be selected. In an embodiment according to the present disclosure, the first permanent magnet may be manufactured by plastic magnet, for example. The plastic magnetic material has low magnetic resistance, good magnetic permeability and deep magnetizing depth, and is suitable for integrated forming and industrial production.
Herein, unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The terms "first," "second," and the like in the description and in the claims, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Likewise, the terms "a" or "an" and the like do not necessarily denote a limitation of quantity. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.
The exemplary implementation of the solution proposed by the present disclosure has been described in detail hereinabove with reference to the preferred embodiments, however, it will be understood by those skilled in the art that various modifications and adaptations can be made to the specific embodiments described above and that various combinations of the technical features, structures proposed by the present disclosure can be made without departing from the scope of the present disclosure, which is defined by the appended claims.