WO2023108908A1

WO2023108908A1 - Prefabricated rotor punching sheet, rotor assembly, electric motor and electrical device

Info

Publication number: WO2023108908A1
Application number: PCT/CN2022/078868
Authority: WO
Inventors: 屈欢; 诸自强; 李文瑞; 吴越虹; 甘磊; 周一恒; 李俊龙
Original assignee: 淮安威灵电机制造有限公司; 美的威灵电机技术（上海）有限公司
Priority date: 2021-12-17
Filing date: 2022-03-02
Publication date: 2023-06-22

Abstract

Provided in the present application are a prefabricated rotor punching sheet, a rotor assembly, an electric motor and an electrical device. The prefabricated rotor punching sheet comprises: a strip-shaped punching sheet, wherein the strip-shaped punching sheet comprises at least two magnetically conductive portions arranged at intervals in the lengthwise direction of the strip-shaped punching sheet; and connecting portions that are connected between every two adjacent magnetically conductive portions, wherein the magnetically conductive portions and the connecting portions are alternately distributed in the lengthwise direction of the strip-shaped punching sheet. According to the present application, the costs of a prefabricated rotor punching sheet and an electric motor using the prefabricated rotor punching sheet can be reduced, thereby ensuring that an outer circle of a rotor iron core formed by the prefabricated rotor punching sheet is more regular, and that an air gap between a rotor assembly and a stator assembly is uniform, thus preventing the phenomenon of aggravation of vibration noise of the electric motor.

Description

Prefabricated rotor laminations, rotor assemblies, motors and electrical equipment

This application is required to be submitted to the State Intellectual Property Office of China on December 17, 2021, the application number is "202111554090.5", the title of the invention is "prefabricated rotor punching, rotor assembly, motor and electrical equipment", and on December 17, 2021 Priority to a Chinese patent application with application number "202123187135.8" and title of invention "Prefabricated rotor punching, rotor assembly, motor and electrical equipment" filed with the State Intellectual Property Office of China, the entire contents of which are hereby incorporated by reference in this application .

technical field

The present application relates to the technical field of prefabricated rotor punching, in particular, to a prefabricated rotor punching, a rotor assembly, a motor and electrical equipment.

Background technique

In the related art, a part of the rotor iron core is formed by stamping, which causes waste of iron core material and low utilization rate of the iron core.

In the related art, some motors use piece-piece rotors, but the additional air gap and insufficient rigidity of the rotors lead to deterioration of the electromagnetic performance and vibration noise of the motors. At the same time, because the outer circle of the segmented rotor is easily uneven and easily deformed, the air gap between the stator structure and the rotor is uneven, which further deteriorates the vibration and noise.

Contents of the invention

This application aims to solve at least one of the technical problems existing in the prior art.

To this end, the first aspect of the present application provides a prefabricated rotor punch.

The second aspect of the present application provides a rotor assembly.

The third aspect of the present application provides a motor.

The fourth aspect of the present application provides an electrical device.

The first aspect of the present application provides a prefabricated rotor punching sheet, including: a bar-shaped punching sheet, the bar-shaped punching sheet includes: at least two magnetically conductive parts, arranged at intervals along the length direction of the bar-shaped punching sheet; Between two adjacent magnetically permeable parts; wherein, the magnetically permeable parts and the connecting parts are distributed alternately along the length direction of the strip-shaped stamping sheet.

The prefabricated rotor laminations provided herein can be used to manufacture rotor assemblies. Wherein, the prefabricated rotor punching sheet includes a bar-shaped punching sheet; during use, the bar-shaped punching sheet can be bent to form an annular rotor core.

In addition, the bar-shaped stamping sheet includes at least two magnetically permeable parts, and a connecting part arranged between two adjacent magnetically permeable parts. Wherein, the magnetically conductive parts and the connecting parts are alternately distributed in the length direction of the strip-shaped punching sheet, and then two adjacent magnetically conductive parts are connected into one body through the connecting parts. During the assembly process of the rotor assembly, the end-to-end connection of the bar-shaped punching sheets can be connected to form a ring-shaped rotor core. In addition, two adjacent magnetically permeable parts can be connected by a magnetically permeable part or a non-magnetically permeable part.

In particular, in the prefabricated rotor punching piece proposed by this application, the ring-shaped rotor core can be formed by bending the strip punching piece. Reduce the size of the mold in the rotor core preparation process, and improve the utilization rate of raw materials for manufacturing the rotor core (such as increasing the utilization rate of silicon steel materials), which is more suitable for large-scale production, and can reduce the rotor core and the application of the rotor core. The cost of the core motor. In addition, the ring-shaped rotor core is formed by end-to-end connection, which can reduce the manufacturing difficulty of the rotor core, improve the production efficiency of the rotor core, and further reduce the cost of the rotor core.

Furthermore, in the prefabricated rotor punching piece proposed by this application, the ring-shaped rotor core can be formed by bending the strip punching piece. It can ensure that the air gap is formed between the rotor assembly and the stator assembly in the motor using the rotor core, and ensure that the rotor core has sufficient rigidity, thereby ensuring the electromagnetic performance of the motor and avoiding the deterioration of the vibration and noise of the motor. Moreover, the present application can ensure that the shape of the rotor core is more regular and less likely to be deformed, thereby ensuring a more regular outer circle of the rotor core, ensuring a uniform air gap between the rotor assembly and the stator assembly, and further avoiding vibration and noise of the motor worsening phenomenon.

In some possible designs, the connection part is a flexible connection part.

In this design, the connecting part is a flexible connecting part; the flexible connecting part itself has the ability to bend and deform. In this way, during the process of manufacturing the rotor core, the strip-shaped punching piece can be deformed by bending the flexible connection portion, and then the ring-shaped rotor core can be formed by the strip-shaped punching piece.

In some possible designs, the connecting portion includes a bent portion, and part of the connecting portion located on both sides of the bent portion is rotationally connected through the bent portion.

In this design, the connecting portion comprises a bend. Wherein, the bending part is arranged in the middle of the connecting part, and part of the connecting parts located on both sides of the bending part are connected by rotation through the bending part. In this way, in the process of manufacturing the rotor core, the strip-shaped punching piece can be deformed by bending the bent portion, and then the ring-shaped rotor core can be formed through the strip-shaped punching piece.

In some possible designs, the bar-shaped punching sheet also includes: a first connection part, which is arranged on the magnetic conducting part at one end of the length direction of the bar-shaped punching sheet; The first connection part can be connected with the second connection part on the magnetic conduction part at the other end.

In this design, the strip punch further includes a first connecting portion and a second connecting portion. Wherein, in the length direction of the bar-shaped punch, the first connecting portion and the second connecting portion are respectively arranged on the two magnetically conductive portions at both ends (specifically, the first connecting portion is arranged on the lengthwise direction of the bar-shaped punch). One end of a magnetic conduction part, the second connecting part is arranged on a magnetic conduction part of one end of the length direction of the strip punch). In this way, in the process of manufacturing the rotor core, through the cooperation of the first connecting part and the second connecting part, the two magnetically conductive parts at both ends of the bar-shaped punching piece can be connected to form a ring-shaped rotor core. .

Specifically, the structures of the first connection part and the second connection part match, and the first connection part and the second connection part can be interlocked.

In some possible designs, one of the first connecting portion and the second connecting portion is a convex portion, and the other is a concave portion.

In this design, one of the first connecting portion and the second connecting portion is a convex portion, and the other is a concave portion. In addition, the protrusions and recesses can be well matched. In this way, on the one hand, the convex part and the concave part can play a positioning role, which facilitates installation, improves installation efficiency, and saves installation time. On the other hand, it can ensure that the positions of the two magnetically conductive parts at both ends of the bar-shaped punching sheet are relatively fixed after being connected by the convex part and the concave part.

In some possible designs, the concave portion includes at least one of the following: polygonal groove, circular groove, and elliptical groove; the shape of the convex portion matches the shape of the concave portion.

In this design, the shape of the convex part matches the shape of the concave part, and the convex part and the concave part can be detachably connected and have a self-locking function. Specifically, the recesses include, but are not limited to, the following structures: polygonal grooves, circular grooves, and elliptical grooves; the shape of the convex portion matches the shape of the concave portion.

In some possible designs, the strip stamping sheet further includes: a magnet slot located between two adjacent magnetic conducting parts, and the magnet slot is used to accommodate the permanent magnet.

In this design, the bar punch also includes magnet slots. Wherein, the magnet slot is located between two adjacent magnetic conducting parts, and the permanent magnet of the rotor assembly can be placed during use, so that the rotor assembly and the stator assembly can be used together.

In this design, further, the connecting part is located at the first end of the magnet slot, and the second end of the magnet slot is open. In this way, it can not only ensure that two adjacent magnetic conducting parts are connected through the connecting part, but also ensure that the permanent magnet can be lightly placed in the magnet slot.

The second aspect of the present application proposes a rotor assembly, including: a rotor core, the rotor core is ring-shaped, and is formed by connecting end-to-end prefabricated rotor punches as described in the first aspect of the present application.

The rotor assembly proposed by the present application includes a rotor core, and the rotor core is formed by end-to-end connection of prefabricated rotor blanks according to the first aspect of the present application. Thus, all the benefits of prefabricated rotor laminations described above are present.

In some possible designs, the rotor core includes a strip of punched laminations.

In this design, the rotor core consists of a strip of punched laminations. In this way, in the process of manufacturing the rotor core, the end to end of a bar-shaped stamping sheet can be connected to form a ring-shaped rotor core.

In some possible designs, the rotor core includes at least two bar-shaped punches, and the at least two bar-shaped punches are connected end-to-end in sequence.

In this design, the rotor core includes at least two bar-shaped laminations. In this way, during the process of manufacturing the rotor core, at least two bar-shaped stamping pieces can be connected end-to-end in sequence to form a ring-shaped rotor core.

In some possible designs, the rotor assembly further includes: permanent magnets disposed in the magnet slots of the rotor stampings, and the polarities of two adjacent permanent magnets are opposite.

In this design, the rotor assembly also includes permanent magnets. Wherein, the permanent magnet is arranged in the magnet slot of the rotor punching piece, and is located between two adjacent magnetic conducting parts. In addition, the polarities of two adjacent permanent magnets are opposite to form a magnetic concentration effect.

In this design, further, the permanent magnets can be arranged in a built-in spoke-shaped magnet arrangement or a built-in V-shaped magnet arrangement.

In some possible designs, the rotor assembly further includes: a first limiting part, disposed on the magnetic conducting part, and used to limit the permanent magnet.

In this design, the rotor assembly also includes a first limiting portion. Wherein, the first limiting part is arranged on the magnetic conducting part and is located at the opening end of the magnet slot; in addition, the first limiting part protrudes from the side wall of the magnetic conducting part. In this way, during the use of the rotor assembly, the permanent magnets located in the magnet slots can be restricted by the first limiting portion, thereby ensuring the temperature of the permanent magnets in the magnet slots and reducing the possibility of the permanent magnets falling out of the magnet slots.

In this design, further, the first limiting portion is a raised structure. That is, in the present application, a protruding structure is provided on the side wall of the magnetic permeable part, so as to limit the permanent magnet at the opening end of the magnet groove through the protruding structure.

In this design, further, the first limiting part and the magnetic permeable part are in an integral structure. In this way, the assembling process of the rotor assembly can be simplified, and the connection strength between the first limiting portion and the magnetic conducting portion can be ensured.

In some possible designs, the rotor assembly further includes a rotating shaft, which passes through the rotor iron core and is connected with the rotor iron core.

In this design, the rotor assembly also includes the shaft. Wherein, the rotating shaft passes through the rotor iron core and is connected with the rotor iron core. In this way, when the motor using the rotor assembly is running, the rotor assembly can drive the rotating shaft to rotate to output torque.

In some possible designs, the rotating shaft includes a second limiting portion, and the second limiting portion protrudes in the radial direction of the rotating shaft; the inner wall of the magnet groove is provided with a third limiting portion, and at least a part of the third limiting portion extends into The magnet slot is connected with the second limiting part.

In this design, the rotating shaft includes a second limiting portion, and the inner wall of the magnet slot is provided with a third limiting portion. In addition, the second limiting portion protrudes radially of the rotating shaft, and at least a part of the second limiting portion protrudes into the magnet slot and is connected with the third limiting portion. In this way, through the cooperation of the second limiting portion and the third limiting portion, the connection strength between the rotating shaft and the rotor core can be further improved, so as to ensure the firmness of the connection between the rotating shaft and the rotor core.

In some possible designs, the second limiting part is a limiting groove, and the second limiting part includes: an extension protruding from the radial direction of the rotating shaft, and the end of the extending part extends into the magnet slot; The protrusion is arranged at the end of the extension part and connected with the limiting groove.

In this design, the second limiting part is a limiting groove, and the limiting groove is recessed in the side wall of the magnetic conduction part. In addition, the second limiting part includes an extension part and a limiting protrusion; wherein, the first end of the extending part is arranged in the radial direction of the rotating shaft, and the second end of the extending part extends into the magnet groove; the limiting protrusion is arranged at The second end of the extension part protrudes from the extension part. In addition, the structure of the limit protrusion and the limit groove is adapted, so that the limit protrusion is connected with the limit groove, and then through the cooperation of the limit protrusion and the limit groove, the rotation shaft and the rotor iron The solidity of the connection of the core.

The third aspect of the present application provides a motor, including: a stator assembly; the rotor assembly of the second aspect of the present application.

The motor proposed in the present application includes the rotor assembly as proposed in the second aspect of the present application. Therefore, it has all the beneficial effects of the above-mentioned rotor assembly, and will not be discussed in detail here.

In addition, the motor also includes a stator assembly that cooperates with a rotor assembly to output torque.

In some possible designs, the stator assembly includes: stator teeth, with stator slots between two adjacent stator teeth; windings, wound on the stator teeth, located in the stator slots; wherein, the number of magnet slots Nr of the rotor assembly, the stator The number of slots Ns and the number of pole pairs Pa of the winding satisfy: Pa=│Nr/2±Ns│.

In this design, the stator assembly includes a stator core, and the stator iron core includes stator teeth and stator slots between two adjacent stator teeth; the stator assembly also includes windings, which are wound on the stator teeth and located in the stator slots.

In this design, further, the number of magnet slots Nr of the rotor assembly, the number of stator slots Ns, and the number of pole pairs Pa of the winding satisfy: Pa=│Nr/2±Ns│. In this way, the new harmonic components appearing in the air-gap magnetic density can be used as the working harmonics of the motor to provide output torque for the motor, thereby effectively improving the torque density of the motor and further improving the efficiency of the motor. Specifically, the number of magnet slots is equal to the number of permanent magnets.

In this design, further, the winding is a concentrated winding, so as to facilitate winding and further improve the production efficiency of the motor.

The fourth aspect of the present application provides an electrical device, including: the motor according to the third aspect of the present application.

The electrical equipment proposed in this application includes the motor according to the above third aspect. Therefore, it has all the beneficial effects of the above motor, and will not be discussed in detail here.

Specifically, the electrical equipment proposed in this application may be products such as refrigerators, washing machines, and air conditioners.

Additional aspects and advantages of the application will become apparent in the description which follows, or may be learned by practice of the application.

Description of drawings

The above and/or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, wherein:

Fig. 1 is a structural schematic diagram of a rotor core according to an embodiment of the present application;

Fig. 2 is one of the structural schematic diagrams of a prefabricated rotor punch according to an embodiment of the present application;

Fig. 3 is the second structural schematic diagram of a prefabricated rotor punch according to an embodiment of the present application;

Fig. 4 is the third structural schematic diagram of the prefabricated rotor punching piece according to an embodiment of the present application;

Fig. 5 is the fourth structural schematic diagram of a prefabricated rotor punching piece according to an embodiment of the present application;

Fig. 6 is the fifth structural schematic diagram of the prefabricated rotor punching piece according to an embodiment of the present application;

Fig. 7 is a partial enlarged view at C of the prefabricated rotor sheet shown in Fig. 6;

Fig. 8 is one of the structural schematic diagrams of the rotor assembly according to an embodiment of the present application;

Fig. 9 is the second structural schematic diagram of the rotor assembly of an embodiment of the present application;

Fig. 10 is a schematic structural view of the intermediate shaft of the rotor assembly shown in Fig. 9;

Fig. 11 is a schematic structural diagram of a stator assembly in a motor according to an embodiment of the present application.

Wherein, the corresponding relationship between reference numerals and component names in Fig. 1 to Fig. 11 is:

100 prefabricated rotor punching piece, 102 strip punching piece, 104 magnetic conduction part, 106 connecting part, 108 first connecting part, 110 second connecting part, 112 magnet slot, 114 permanent magnet, 116 first limiting part, 118 first Second limit part, 120 third limit part, 122 extension part, 124 limit protrusion, 126 rotating shaft, 128 rotor core, 130 stator assembly, 132 stator teeth, 134 stator slot, 136 winding, 138 stator auxiliary teeth, 142 stator core.

Detailed ways

In order to better understand the above-mentioned purpose, features and advantages of the present application, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

In the following description, many specific details are set forth in order to fully understand the application, but the application can also be implemented in other ways than described here, therefore, the protection scope of the application is not limited by the specific implementation disclosed below. Example limitations.

A prefabricated rotor punch 100 , a rotor assembly, a motor and electrical equipment provided according to some embodiments of the present application are described below with reference to FIGS. 1 to 11 . Wherein, A in FIG. 1 , FIG. 8 and FIG. 9 represents the connection position of the strip punches 102 ; B in FIG. 3 represents the connection position of two adjacent strip punches 102 .

As shown in FIG. 1 , the first embodiment of the present application proposes a prefabricated rotor punch 100 , including a bar-shaped punch 102 ; during use, the bar-shaped punch 102 can be bent to form an annular rotor core 128 .

Wherein, as shown in FIG. 2 , FIG. 3 , FIG. 4 , FIG. 5 and FIG. 6 , the strip punch 102 includes at least two magnetically permeable parts 104 and a connecting part 106 arranged between two adjacent magnetically permeable parts 104 The magnetically permeable parts 104 and the connecting parts 106 are distributed alternately in the length direction of the strip punch 102 , and then the two adjacent magnetically permeable parts 104 are connected as a whole through the connecting parts 106 .

During the assembly process of the rotor assembly, the strip punching pieces 102 may be connected end to end to form an annular rotor core 128 . In addition, two adjacent magnetically permeable parts 104 may be connected by a magnetically permeable part or a non-magnetically permeable part.

In particular, as shown in FIG. 1 , in the prefabricated rotor punch 100 proposed by the present application, the ring-shaped rotor core 128 can be formed by bending the bar-shaped punch 102 . type rotor core, the present application can reduce the size of the mold during the preparation process of the prefabricated rotor punch 100, and improve the utilization rate of raw materials for manufacturing the prefabricated rotor punch 100 (for example, increase the utilization rate of silicon steel materials), which is more suitable for large-scale At the same time, the cost of the prefabricated rotor blank 100 and the motor using the prefabricated rotor blank 100 can be reduced. In addition, forming the prefabricated rotor punch 100 by end-to-end connection can reduce the manufacturing difficulty of the prefabricated rotor punch 100 , improve the production efficiency of the prefabricated rotor punch 100 , and further reduce the cost of the prefabricated rotor punch 100 .

Further, as shown in FIG. 1 , in the prefabricated rotor punch 100 proposed by the present application, the ring-shaped rotor core 128 can be formed by bending the bar-shaped punch 102 . Block type rotor core, this application can ensure that the air gap is formed between the rotor assembly and the stator assembly 130 in the motor using the prefabricated rotor punch 100, and ensure that the prefabricated rotor punch 100 has sufficient rigidity, thereby ensuring the electromagnetic force of the motor. performance, and to avoid deterioration of vibration and noise of the motor. Moreover, the present application can ensure that the shape of the prefabricated rotor punch 100 is more regular and less likely to be deformed, thereby ensuring that the outer circle of the prefabricated rotor punch 100 is more regular, ensuring that the air gap between the rotor assembly and the stator assembly 130 is uniform, and further Avoid the deterioration of vibration and noise of the motor.

The second embodiment of this application proposes a prefabricated rotor punch 100, on the basis of the first embodiment, further:

The connection part 106 is a flexible connection part (not shown in the figure). The flexible connecting part itself has the capability of being able to bend and deform. In this way, as shown in FIG. 1 , in the process of manufacturing the rotor core 128 , the prefabricated rotor punching piece 100 can be deformed by bending the flexible connection portion, and then the strip punching piece 102 can be used to form a ring-shaped rotor. Iron core 128.

In addition, the prefabricated rotor punch 100 proposed in this embodiment has all the beneficial effects of the prefabricated rotor punch 100 in the first embodiment, and can reduce the cost of the prefabricated rotor punch 100 and the motor to which the prefabricated rotor punch 100 is applied. It also ensures that the outer circle of the prefabricated rotor sheet 100 is more regular, ensures that the air gap between the rotor assembly and the stator assembly 130 is uniform, and further avoids the deterioration of vibration and noise of the motor, which will not be discussed in detail here.

The third embodiment of this application proposes a prefabricated rotor punch 100, on the basis of the first embodiment, further:

The connecting portion 106 includes a bent portion (not shown in the figure). Wherein, the bent part is arranged in the middle of the connecting part 106, and part of the connecting part 106 located on both sides of the bent part is connected by rotation through the bent part. In this way, as shown in FIG. 1 , in the process of manufacturing the rotor core 128 , the prefabricated rotor punching piece 100 can be deformed by bending the bent portion, and then the strip punching piece 102 can be used to form a ring-shaped rotor. Iron core 128.

In addition, the prefabricated rotor punch 100 proposed in this embodiment has all the beneficial effects of the rotor assembly of the first embodiment, can reduce the cost of the prefabricated rotor punch 100 and the motor using the prefabricated rotor punch 100, and ensures The outer circle of the prefabricated rotor sheet 100 is more regular, which ensures a uniform air gap between the rotor assembly and the stator assembly 130, and further avoids deterioration of vibration and noise of the motor, which will not be discussed in detail here.

The fourth embodiment of the present application proposes a prefabricated rotor punch 100, on the basis of the first embodiment, the second embodiment and the third embodiment, further:

As shown in FIG. 1 , the prefabricated rotor punch 100 further includes a first connecting portion 108 and a second connecting portion 110 . Wherein, in the length direction of the bar punching sheet 102 , the first connecting portion 108 and the second connecting portion 110 are respectively arranged on the two magnetically permeable portions 104 at both ends. Specifically, the first connecting portion 108 is disposed on a magnetically conductive portion 104 at one end of the strip punch 102 in the longitudinal direction, and the second connecting portion 110 is disposed on a magnetically conductive portion at one end of the strip punch 102 in the longitudinal direction. 104 on.

In this way, as shown in FIG. 1 , in the process of manufacturing the rotor core 128 , through the cooperation of the first connecting portion 108 and the second connecting portion 110 , the two magnetically conductive portions 104 at the two ends of the strip punching piece 102 are connected to form an annular rotor core 128 .

Specifically, as shown in FIG. 4 , FIG. 5 and FIG. 6 , the structures of the first connecting portion 108 and the second connecting portion 110 match, and the first connecting portion 108 and the second connecting portion 110 can be interlocked.

In this embodiment, further, as shown in FIG. 4 , FIG. 5 and FIG. 6 , one of the first connecting portion 108 and the second connecting portion 110 is a convex portion, and the other is a concave portion. In addition, the protrusions and recesses can be well matched. In this way, on the one hand, the convex part and the concave part can play a positioning role, which facilitates installation, improves installation efficiency, and saves installation time. On the other hand, it can be ensured that the positions of the two magnetically permeable parts 104 at both ends of the bar-shaped punching sheet 102 are relatively fixed after being connected by the convex part and the concave part.

In this embodiment, further, as shown in Figure 4, Figure 5 and Figure 6, the shape of the convex part is adapted to the shape of the concave part, and the connection between the convex part and the concave part can be detachable, and has self-locking Function. Specifically, the recesses include, but are not limited to, the following structures: polygonal grooves, circular grooves, and elliptical grooves; the shape of the convex portion matches the shape of the concave portion.

The fifth embodiment of the present application proposes a prefabricated rotor punch 100, on the basis of the first embodiment, the second embodiment, the third embodiment and the fourth embodiment, further:

As shown in FIG. 1 , the prefabricated rotor punch 100 also includes magnet slots 112 . Wherein, the magnet slot 112 is located between two adjacent magnetic conducting parts 104 , and can place the permanent magnet 114 of the rotor assembly during use, so that the rotor assembly and the stator assembly 130 are used together.

In this embodiment, further, as shown in FIG. 2 , FIG. 3 , FIG. 4 , FIG. 5 and FIG. 6 , the connecting portion 106 is located at the first end of the magnet slot 112 , and the second end of the magnet slot 112 is open. In this way, it can not only ensure that two adjacent magnetic conducting parts 104 are connected through the connecting part 106 , but also ensure that the permanent magnet 114 can be lightly placed in the magnet slot 112 .

The sixth embodiment of the present application proposes a rotor assembly, including a rotor core 128 .

In particular, the rotor core 128 is formed by end-to-end connection of the prefabricated rotor blanks 100 according to the first aspect of the present application. Therefore, all the beneficial effects of the above-mentioned prefabricated rotor punching 100 are obtained.

The seventh embodiment of the present application proposes a rotor assembly, on the basis of the sixth embodiment, further:

As shown in FIG. 2 , the rotor core 128 may include a bar-shaped punching piece 102 . In this way, in the process of manufacturing the rotor core 128 , the end-to-end connection of a bar-shaped stamping piece 102 can be used to form the ring-shaped rotor core 128 .

As shown in FIG. 3 , the prefabricated rotor punching piece 100 may include at least two bar-shaped punching pieces 102 . In this way, during the process of manufacturing the rotor core 128 , at least two rotor cores 128 may be sequentially connected end to end to form an annular rotor core 128 .

Further, as shown in FIG. 2 , FIG. 3 , FIG. 4 , FIG. 5 and FIG. 6 , the number of strip punches 102 and the length of each strip punch 102 can be designed according to actual needs.

In the case that the radial dimension of the prefabricated rotor punching piece 100 is relatively large, multiple strip-shaped punching pieces 102 may be connected end-to-end, and the length of each strip-shaped punching piece 102 may be designed to be relatively long.

In the case that the radial dimension of the prefabricated rotor punching sheet 100 is small, a strip-shaped punching sheet 102 may be connected end to end, and the length of the strip-shaped punching sheet 102 may be designed to be short. Those skilled in the art can understand the number of strip punches 102 and the length of each strip punch 102 .

The eighth embodiment of the present application proposes a rotor assembly, on the basis of the sixth and seventh embodiments, further:

As shown in FIGS. 8 and 9 , the rotor assembly also includes permanent magnets 114 . Wherein, the permanent magnet 114 is arranged in the magnet slot 112 of the prefabricated rotor punch 100 , and is located between two adjacent magnetic conducting parts 104 . In addition, the polarities of two adjacent permanent magnets 114 are opposite to form a magnetic concentration effect.

In this embodiment, further, the permanent magnets 114 may be arranged in a built-in spoke-shaped magnet arrangement or a built-in V-shaped magnet arrangement.

The ninth embodiment of the present application proposes a rotor assembly, on the basis of the eighth embodiment, further:

As shown in FIG. 5 , the prefabricated rotor punch 100 further includes a first limiting portion 116 . Wherein, the first limiting portion 116 is disposed on the magnetic conducting portion 104 and is located at the opening end of the magnet slot 112 ; in addition, the first limiting portion 116 protrudes from the sidewall of the magnetic conducting portion 104 .

In this way, during the use of the rotor, the permanent magnets 114 located in the magnet slots 112 can be limited by the first stopper 116, thereby ensuring that the temperature of the permanent magnets 114 is in the magnet slots 112, and reducing the temperature of the permanent magnets 114 from the magnet slots 112. possibility of falling out.

In this embodiment, further, as shown in FIG. 5 , the first limiting portion 116 is a protruding structure. That is, in the present application, a protruding structure is provided on the sidewall of the magnetic permeable part 104 , so as to limit the permanent magnet 114 at the opening end of the magnet slot 112 through the protruding structure.

In this embodiment, further, as shown in FIG. 5 , the first limiting portion 116 and the magnetic permeable portion 104 are integrally structured. In this way, the assembly process of the prefabricated rotor punch 100 can be simplified, and the connection strength between the first limiting portion 116 and the magnetic conducting portion 104 can be ensured.

In addition, the rotor assembly proposed in this embodiment has all the beneficial effects of the prefabricated rotor punch 100 in the first embodiment, can reduce the cost of the prefabricated rotor punch 100 and the motor using the prefabricated rotor punch 100, and ensures The outer circle of the prefabricated rotor sheet 100 is more regular, which ensures a uniform air gap between the rotor assembly and the stator assembly 130, and further avoids deterioration of vibration and noise of the motor, which will not be discussed in detail here.

The tenth embodiment of the present application proposes a rotor assembly. On the basis of the eighth and ninth embodiments, further:

As shown in FIG. 8 , FIG. 9 and FIG. 10 , the rotor core 128 has an annular structure; the rotor assembly also includes a rotating shaft 126 . Wherein, the rotating shaft 126 passes through the prefabricated rotor punch 100 and is connected with the prefabricated rotor punch 100 . In this way, when the motor using the rotor assembly is running, the rotor core 128 can drive the rotating shaft 126 to rotate to output torque.

In this embodiment, further, as shown in FIG. 10 , the rotating shaft 126 includes a second limiting portion 118 , and as shown in FIGS. 6 and 7 , the inner wall of the magnet slot 112 is provided with a third limiting portion 120 . In addition, the second limiting portion 118 protrudes radially of the rotating shaft 126 , and at least a part of the second limiting portion 118 protrudes into the magnet slot 112 and is connected with the third limiting portion 120 . In this way, through the cooperation of the second limiting portion 118 and the third limiting portion 120, the connection strength between the rotating shaft 126 and the prefabricated rotor punch 100 can be further improved to ensure the firmness of the connection between the rotating shaft 126 and the prefabricated rotor punching 100 .

In this embodiment, further, as shown in FIG. 7 , the second limiting portion 118 is a limiting groove. As shown in FIG. 10 , the second limiting portion 118 includes: an extension portion 122 protruding from the rotating shaft 126 The radial arrangement of the extension part 122 extends into the magnet groove 112; the limiting protrusion 124 is arranged at the end of the extending part 122 and is connected with the limiting groove.

In this embodiment, further, as shown in FIG. 7 , the second limiting portion 118 is a limiting groove, and the limiting groove is recessed on the side wall of the magnetic permeable portion 104 . In addition, as shown in FIG. 10 , the second limiting portion 118 includes an extending portion 122 and a limiting protrusion 124124; wherein, the first end of the extending portion 122 is arranged in the radial direction of the rotating shaft 126, and the second end of the extending portion 122 extends into the magnet slot 112 ; the limiting protrusion 124 is disposed on the second end of the extension portion 122 and protrudes from the extension portion 122 . In addition, the structure of the limit protrusion 124 is adapted to the limit groove, so that the limit protrusion 124 is connected with the limit groove, and then through the cooperation of the limit protrusion 124 and the limit groove, the rotation shaft is guaranteed 126 and the connection firmness of the rotor core 128.

The eleventh embodiment of the present application provides a motor, including a stator assembly and a rotor assembly as in any one of the above embodiments.

The motor proposed in the present application includes the rotor assembly as proposed in the second aspect of the present application. Therefore, having all the beneficial effects of the above-mentioned rotor assembly, the cost of the prefabricated rotor punch 100 and the motor using the prefabricated rotor punch 100 can be reduced, and the outer circle of the prefabricated rotor punch 100 is guaranteed to be more regular, ensuring that the rotor assembly is compatible with The air gap between the stator assemblies 130 is even, which further avoids deterioration of vibration and noise of the motor, which will not be discussed in detail here.

In addition, as shown in FIG. 11 , the motor further includes a stator assembly 130 , and the stator assembly 130 cooperates with the rotor assembly to output torque.

The twelfth embodiment of the present application proposes a motor, on the basis of the eleventh embodiment, further:

As shown in FIG. 11 , the stator assembly 130 includes a stator core 142, and the stator core 142 includes stator teeth 132 and stator slots 134 between two adjacent stator teeth 132; the stator structure also includes a winding 136, and the winding 136 is wound on The stator teeth 132 are located in the stator slots 134 .

In this embodiment, further, the number Nr of magnet slots 112 of the rotor assembly, the number Ns of stator slots 134 , and the number Pa of pole pairs of windings 136 satisfy: Pa=│Nr/2±Ns│. In this way, the new harmonic components appearing in the air gap flux density can be used as the working harmonics of the motor to provide output torque for the motor, thereby effectively improving the torque density of the motor and further improving the efficiency of the motor. Specifically, the number of magnet slots 112 is equal to the number of permanent magnets 114 .

In this embodiment, further, the winding 136 is a concentrated winding 136, so as to facilitate winding and further improve the production efficiency of the motor.

On the basis of the eleventh embodiment and the twelfth embodiment, further, the motor proposed in this application is a double air gap permanent magnet motor. In addition, the double-air-gap permanent magnet motor has the advantages of being suitable for large-scale production, reducing the size of the mold, and improving the utilization rate of silicon steel materials. At the same time, the additional air gap of the motor is smaller, the magnetic flux leakage is smaller, the overall rigidity of the motor is better, and the roundness is better, thereby improving the vibration and noise of the motor.

The thirteenth embodiment of the present application provides an electrical device, including the motor according to any one of the above embodiments.

The electrical equipment proposed in this application includes the motor according to any one of the above embodiments. Therefore, it has all the beneficial effects of the above motor, and will not be discussed in detail here.

In the related art, a part of the rotor iron core is formed by stamping, which causes waste of iron core material and low utilization rate of the iron core. In addition, some motors in the related art use block rotors, but the resulting additional air gap and insufficient rotor rigidity lead to deterioration of the electromagnetic performance and vibration noise of the motor. At the same time, because the outer circle of the segmented rotor is easily uneven and easily deformed, the air gap between the stator structure and the rotor is uneven, which further deteriorates the vibration and noise.

For this reason, as shown in FIG. 1 , the present application proposes a rotor core 128 , a rotor, a motor and electrical equipment, which have the advantages of high mass production efficiency and low vibration and noise.

Specifically, as shown in FIG. 2 , FIG. 3 , FIG. 4 , FIG. 5 and FIG. 6 , the prefabricated rotor punch 100 proposed in this application includes a strip punch 102 , wherein, along the length direction of the strip punch 102 , the strip A plurality of magnetically permeable parts 104 and connecting parts 106 are arranged sequentially on the punching sheet 102 . The magnetically conductive part 104 and the connecting part 106 are sequentially connected and arranged at intervals along the length direction of the strip punch 102 , forming a continuous extension along the length direction. In addition, the magnetically conductive portion 104 protrudes along the width direction of the strip punch 102 , and the connecting portion 106 extends along the length direction of the strip punch 102 . In addition, there is a magnet slot 112 between two adjacent magnetic conducting parts 104 , one end of the magnet slot 112 is open, and the other end is closed by the connecting part 106 .

Further, as shown in FIG. 4 , FIG. 5 and FIG. 6 , in the length direction of the strip punch 102 , the first magnetically permeable part 104 and the last magnetically permeable part 104 are provided with a first connecting part with a self-locking function 108 and the second connection part 110. Wherein, one of the first connecting portion 108 and the second connecting portion 110 is a convex portion, and the other is a concave portion. In addition, the concave portion includes at least one of the following: polygonal groove, circular groove, and elliptical groove; the shape of the convex portion matches the shape of the concave portion.

Further, as shown in FIG. 2 , the prefabricated rotor punching piece 100 includes a bar-shaped punching piece 102 , and one strip-shaped punching piece 102 is connected end to end to form the prefabricated rotor punching piece 100 . As shown in FIG. 3 , the prefabricated rotor punching piece 100 may also include at least two bar-shaped punching pieces 102 , and the at least two strip-shaped punching pieces 102 are sequentially connected end-to-end to form the prefabricated rotor punching piece 100 . Wherein, the outside of the connecting portion 106 and the magnetically conductive portion 104 roughly forms the outer diameter of the prefabricated rotor punch 100 , and the inner side of the magnetically conductive portion 104 roughly forms the inner diameter of the prefabricated rotor punch 100 .

Further, as shown in FIG. 8 and FIG. 9 , the permanent magnets are placed in the magnet slots, and the polarities of two adjacent permanent magnets 114 are opposite to form a magnetic concentration effect. Wherein, the permanent magnets 114 can be arranged in a built-in spoke-shaped magnet arrangement or a built-in V-shaped magnet arrangement.

Further, as shown in FIG. 5 , a first limiting portion 116 may be provided near the terminal end of the magnetically conductive portion 104 extending along the width direction of the bar-shaped punching piece 102 , which can pass through the first limiting portion after being spliced into a prefabricated rotor punching piece 100 116 prevents the permanent magnet 114 from sliding down from the magnet groove 112, ensures that the temperature of the permanent magnet 114 is in the magnet groove 112, and reduces the possibility of the permanent magnet 114 falling off from the magnet groove 112. Specifically, the first limiting portion 116 may adopt a groove.

Further, as shown in FIG. 6 and FIG. 7 , a third limiting portion 120 may be provided near the end of the extension of the magnetically conductive portion 104 along the width direction of the strip punch 102 . As shown in FIG. 9 and FIG. 10 , when spliced into a rotor Finally, the third limiting part 120 can cooperate with the second limiting part 118 of the protruding part of the rotating shaft 126 . Specifically, as shown in FIGS. 7 and 10 , the second limiting portion 118 is a limiting groove, and the second limiting portion 118 includes a radial extension 122 protruding from the rotating shaft 126 , and a The limit protrusion 124 on the top, the limit protrusion 124 is connected with the limit groove, further improving the connection strength between the rotating shaft 126 and the prefabricated rotor punch 100, so as to ensure that the connection between the rotating shaft 126 and the prefabricated rotor punch 100 is firm sex.

Furthermore, compared with the stamped rotor core 128 used in the related art, the present application can reduce the size of the mold during the preparation process of the prefabricated rotor punch 100 and improve the utilization rate of raw materials for manufacturing the prefabricated rotor punch 100 ( For example, improving the utilization rate of silicon steel materials) is more suitable for large-scale production, and at the same time can reduce the cost of the prefabricated rotor punch 100 and the motor using the prefabricated rotor punch 100 . In addition, forming the prefabricated rotor punch 100 by end-to-end connection can reduce the manufacturing difficulty of the prefabricated rotor punch 100 , improve the production efficiency of the prefabricated rotor punch 100 , and further reduce the cost of the prefabricated rotor punch 100 .

Furthermore, compared with the block-type rotor core 128 used in the related art, the present application can ensure that the air gap is formed between the rotor assembly and the stator assembly 130 in the motor applying the prefabricated rotor punching plate 100, and ensure that the prefabricated The rotor punch 100 has sufficient rigidity, thereby ensuring the electromagnetic performance of the motor and avoiding deterioration of vibration and noise of the motor. Moreover, the present application can ensure that the shape of the prefabricated rotor punch 100 is more regular and less likely to be deformed, thereby ensuring that the outer circle of the prefabricated rotor punch 100 is more regular, ensuring that the air gap between the rotor assembly and the stator assembly 130 is uniform, and further Avoid the deterioration of vibration and noise of the motor.

Further, the present application also proposes a motor, including the above-mentioned rotor assembly and the stator assembly 130 . Additionally, stator assembly 130 includes stator teeth 132 and windings 136 . Wherein, the number Nr of the magnet slots 112 of the rotor assembly, the number Ns of the stator slots 134 , and the pole pair number Pa of the winding 136 satisfy: Pa=|Nr/2±Ns|. In this way, the new harmonic components appearing in the air-gap magnetic density can be used as the working harmonics of the motor to provide output torque for the motor, thereby effectively improving the torque density of the motor and further improving the efficiency of the motor. Specifically, the number of magnet slots 112 is equal to the number of permanent magnets 114 .

Further, the auxiliary stator teeth 138 are arranged on the stator teeth 132 , and the auxiliary stator teeth 138 can be used not only as a magnetic conducting component, but also as a modulating component to realize the function of magnetic field modulation.

Further, the motor proposed in this application is a double air gap permanent magnet motor. In addition, the double-air-gap permanent magnet motor has the advantages of being suitable for large-scale production, reducing the size of the mold, and improving the utilization rate of silicon steel materials. At the same time, the additional air gap of the motor is smaller, the magnetic flux leakage is smaller, the overall rigidity of the motor is better, and the roundness is better, thereby improving the vibration and noise of the motor.

In this application, the term "plurality" means two or more, unless otherwise clearly defined. The terms "installation", "connection", "connection", "fixed" and other terms should be interpreted in a broad sense, for example, "connection" can be fixed connection, detachable connection, or integral connection; "connection" can be directly or indirectly through an intermediary. Those of ordinary skill in the art can understand the specific meanings of the above terms in this application according to specific situations.

In the description of this specification, descriptions of the terms "one embodiment", "some embodiments", "specific embodiments" and the like mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in this application In at least one embodiment or example of . In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above descriptions are only preferred embodiments of the present application, and are not intended to limit the present application. For those skilled in the art, there may be various modifications and changes in the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included within the protection scope of this application.

Claims

A prefabricated rotor punch, including:

Strip stamping, the strip stamping includes:

At least two magnetically conductive parts are arranged at intervals along the length direction of the strip punch;

a connecting part, connected between two adjacent magnetic conducting parts;

Wherein, the magnetic conducting parts and the connecting parts are distributed alternately in the length direction of the strip-shaped stamping sheet.
The prefabricated rotor punching according to claim 1, wherein,

the connecting portion is a flexible connecting portion; or

The connecting portion includes a bent portion, and parts of the connecting portion located on both sides of the bent portion are rotationally connected through the bent portion.
The prefabricated rotor plate according to claim 1, further comprising:

The first connecting part is arranged on the magnetic conducting part at one end of the strip punch in the longitudinal direction;

The second connection part is arranged on the magnetic conduction part at the other end of the strip punch in the longitudinal direction, and the first connection part can be connected with the second connection part.
The prefabricated rotor punching according to claim 3, wherein,

One of the first connecting portion and the second connecting portion is a convex portion, and the other is a concave portion.
The prefabricated rotor punching according to claim 4, wherein,

The recess includes at least one of the following: polygonal grooves, circular grooves, and elliptical grooves;

The shape of the convex part is adapted to the shape of the concave part.
The prefabricated rotor punch according to any one of claims 1 to 5, further comprising:

The magnet slot is located between two adjacent magnetic conducting parts, and the magnet slot is used for accommodating a permanent magnet.
A rotor assembly, comprising:

The rotor core, the rotor core is ring-shaped, and is formed by connecting the prefabricated rotor punches according to any one of claims 1 to 6 end to end.
The rotor assembly of claim 7, wherein:

The rotor core includes a bar-shaped punch; or

The rotor core includes at least two bar-shaped punches, and at least two bar-shaped punches are connected end-to-end in sequence.
The rotor assembly of claim 7, further comprising:

The permanent magnets are arranged in the magnet slots of the prefabricated rotor punches, and the polarities of two adjacent permanent magnets are opposite.
The rotor assembly according to claim 9, wherein said prefabricated rotor blank further comprises:

The first limiting part is arranged on the magnetic conduction part and is used for limiting the permanent magnet.
The rotor assembly of claim 9, wherein said rotor assembly:

A rotating shaft, the rotating shaft passes through the rotor iron core and is connected with the prefabricated rotor punch.
The rotor assembly of claim 11, wherein:

The rotating shaft includes a second limiting portion, and the second limiting portion protrudes radially of the rotating shaft;

The inner wall of the magnet slot is provided with a third limiting portion, at least a part of the second limiting portion protrudes into the magnet slot and is connected with the third limiting portion.
The rotor assembly according to claim 12, wherein the second limiting part is a limiting groove, and the second limiting part comprises:

an extension protruding from the radial direction of the rotating shaft, and the end of the extension protrudes into the magnet slot;

The limiting protrusion is arranged at the end of the extension part and connected with the limiting groove.
A motor, including:

stator assembly;

A rotor assembly as claimed in any one of claims 7 to 13.
The electric machine of claim 14, wherein said stator assembly comprises:

Stator teeth, with stator slots between two adjacent stator teeth;

windings wound around the stator teeth and located within the stator slots;

Wherein, the number Nr of the magnet slots of the rotor assembly, the number Ns of the stator slots, and the pole pair number Pa of the winding satisfy: Pa=|Nr/2±Ns|.
An electrical device, comprising:

A motor as claimed in claim 14 or 15.