Rotor and motor

Abstract

The embodiment of the invention provides a rotor and a motor. The rotor comprises a rotor iron core and magnetic steel pieces. The rotor core is provided with a plurality of magnetic steel groove groups along the circumferential direction of the rotor core. And each magnetic steel groove group at least comprises two magnetic steel grooves which are arranged in a V shape with outward openings. The two magnetic steel grooves are symmetrical along the first axis of the rotor. One end of each magnetic steel groove is close to the first axis and the other end is close to the side wall of the rotor core. The magnetic steel pieces are arranged in the magnetic steel grooves. The magnetic steel piece comprises a main body part and magnetic steel end parts arranged at the two ends of the main body part in the width direction, and the thickness of the magnetic steel end parts is larger than that of the main body part. Wherein the width direction of the magnetic steel piece is perpendicular to the axial direction of the rotor. According to the rotor provided by the embodiment of the invention, the thickness of the magnetic steel end part of the magnetic steel piece is greater than that of the middle main body part, so that the demagnetization resistance of the magnetic steel piece at the magnetic steel end part is improved, the magnetic resistance of the magnetic steel piece is reduced, the D-axis inductance is increased, the three-phase short-circuit current is reduced, and the continuous operation capability of a motor under fault working conditions such as three-phase short circuit is improved.

Description

Technical Field

[0001] The present application relates to the field of motor technology, and in particular to a rotor and a motor. Background Art

[0002] Compared with traditional motors, the current permanent magnet synchronous motors have the advantages of simple structure, high efficiency and good performance.

[0003] In the related art, the magnets installed on the rotor of a permanent magnet synchronous motor are prone to local demagnetization at the four corners of the magnets under high temperature and high current conditions. The demagnetization of the magnets will cause damage to the motor, thereby affecting the operation of the motor traction system. Summary of the invention

[0004] In view of this, the embodiments of the present application hope to provide a rotor and a motor to enhance the anti-demagnetization capability of the magnetic steel installed on the rotor.

[0005] To achieve the above object, one aspect of an embodiment of the present application provides a rotor, comprising:

[0006] A rotor core, wherein the rotor core is provided with a plurality of magnetic steel slot groups along the circumferential direction, each of the magnetic steel slot groups comprises at least two magnetic steel slots arranged in a V-shape with openings facing outwards, the two magnetic steel slots are symmetrical along the first axis of the rotor, one end of the magnetic steel slot is close to the first axis, and the other end is close to the side wall of the rotor core;

[0007] A magnetic steel part, the magnetic steel part is arranged in the magnetic steel slot, the magnetic steel part comprises a main body and magnetic steel end portions arranged at both ends of the main body along the width direction, and the thickness of the magnetic steel end portions is greater than the thickness of the main body;

[0008] Wherein, the width direction of the magnetic steel part is perpendicular to the axial direction of the rotor.

[0009] In some embodiments, the first axis is the D-axis of the rotor.

[0010] In some embodiments, the magnetic steel slot group includes two magnetic steel slot units, each of the magnetic steel slot units includes two magnetic steel slots arranged in a V-shape with openings facing outward, and the two magnetic steel slot units are spaced apart along the first axis.

[0011] In some embodiments, one of the magnetic steel ends of the magnetic steel part is close to the first axis, and the other magnetic steel end is close to the side wall of the rotor core. The main body and the magnetic steel ends at both ends are flush with the side wall on one side of the magnetic steel part along the thickness direction, and a groove is formed on the other side wall.

[0012] In some embodiments, the magnetic steel end includes a connection layer and at least two first blocks, two adjacent first blocks are connected by the connection layer, and each of the first blocks is arranged along the width direction of the magnetic steel member.

[0013] In some embodiments, the main body includes a connecting layer and at least two second blocks, two adjacent second blocks are connected by the connecting layer, and each of the second blocks is arranged along the width direction of the magnetic steel component.

[0014] In some embodiments, a size of the first segment in the width direction of the magnetic steel member is smaller than a size of the second segment in the width direction of the magnetic steel member.

[0015] In some embodiments, a connecting layer is provided between the end portion of the magnetic steel and the main body.

[0016] In some embodiments, the connection layer includes an insulating film and an insulating glue.

[0017] In some embodiments, a dimension of each of the magnetic steel ends in the width direction of the magnetic steel component is smaller than a dimension of the main body in the width direction of the magnetic steel component.

[0018] In some embodiments, the groove wall of the magnetic steel groove protrudes along the thickness direction of the magnetic steel part to form a protrusion, and the protrusion matches the groove to limit the magnetic steel part in the width direction.

[0019] In some embodiments, magnetic isolation cavities are respectively provided at both ends of the magnetic steel groove along the width direction of the magnetic steel part, the magnetic isolation cavities are connected to the magnetic steel groove, and the groove walls of the magnetic steel groove along the width direction of the magnetic steel part respectively limit the magnetic steel part in the width direction of the magnetic steel part.

[0020] Another aspect of an embodiment of the present application provides a motor, comprising a rotor as described in any one of the above items.

[0021] The rotor provided in the embodiment of the present application is configured such that at least two magnetic steel slots of the magnetic steel slot group are arranged in a V-shape with the opening facing outward, and the magnetic steel slots are symmetrical along the first axis of the rotor, so that the magnetic steel end of the magnetic steel part arranged in the magnetic steel slot is close to the first axis at one end along the width direction, and the magnetic steel end of the other end is close to the side wall of the rotor core, and the thickness of the two magnetic steel ends is greater than the thickness of the middle main body. In this way, the magnetic steel ends arranged at both ends of the magnetic steel slot in the width direction are close to the first axis and the side wall of the rotor core respectively. On the one hand, the increase in the thickness of the magnetic steel end close to the first axis can improve the anti-demagnetization ability of the magnetic steel part close to the first axis; on the other hand, the magnetic steel part close to the side wall of the rotor core, that is, close to the stator-rotor air gap part, can improve the anti-demagnetization ability of the magnetic steel part close to the rotor surface by increasing the thickness of the magnetic steel end at this part; on the other hand, the thickness of the main body is thinner than that of the magnetic steel end, which can reduce the magnetic resistance, increase the D-axis inductance, reduce the three-phase short-circuit current, and improve the continuous operation ability of the motor under fault conditions such as three-phase short circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of the structure of the rotor provided for this application;

[0023] Figure 2 A partial cross-sectional schematic diagram of a rotor provided in this application;

[0024] Figure 3 It is a cross-sectional view of the rotor in this application on a cross section perpendicular to the axial direction;

[0025] Figure 4 for Figure 3 The enlarged view of point A in the middle;

[0026] Figure 5 A schematic diagram of the structure of the magnetic steel component of the rotor provided in this application.

[0027] Description of Reference Numerals

[0028] 10. Rotor; 11. Rotor core; 11a. Magnetic steel slot group; 11b. Magnetic steel slot unit; 11c. Magnetic steel slot; 11d. Protrusion; 11e. Magnetic isolation cavity; 11f. Magnetic barrier hole; 11g. Ventilation hole; 12. Magnetic steel part; 12a. Groove; 121. Main body; 1211. Second block; 122. Magnetic steel end; 1221. First block; 1222. Connecting layer; 13. Rotating shaft; 14. Rotor pressure ring; s. First axis. DETAILED DESCRIPTION

[0029] The following is a further detailed description of the implementation of the present application in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present application but cannot be used to limit the scope of the present application.

[0030] In the description of the embodiments of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "top", "bottom", "inner", "outer", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present application. In addition, the terms "first", "second", "third", etc. are used only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0031] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0032] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0033] Compared with traditional motors, the current permanent magnet synchronous motors have the advantages of simple structure, high efficiency and good performance.

[0034] In the related art, the magnets installed on the rotor of a permanent magnet synchronous motor are prone to local demagnetization at the four corners of the magnets under high temperature and high current conditions. The demagnetization of the magnets will cause damage to the motor, thereby affecting the operation of the motor traction system.

[0035] Based on the above situation, the first aspect of the embodiment of the present application provides a rotor 10, see Figures 1 to 5. The rotor 10 includes a rotor core 11 and a magnetic steel part 12. The rotor core 11 is provided with a plurality of magnetic steel slot groups 11a along the circumferential direction. Each magnetic steel slot group 11a includes at least two magnetic steel slots 11c arranged in a V-shape with the opening facing outward. The two magnetic steel slots 11c are symmetrical along the first axis s of the rotor 10. One end of the magnetic steel slot 11c is close to the first axis s, and the other end is close to the side wall of the rotor core 11. The magnetic steel part 12 is arranged in the magnetic steel slot 11c. The magnetic steel part 12 includes a main body 121 and magnetic steel end portions 122 arranged at both ends of the main body 121 along the width direction. The thickness of the magnetic steel end portions 122 is greater than the thickness of the main body 121. Among them, the width direction of the magnetic steel part 12 is perpendicular to the axial direction of the rotor 10.

[0036] It should be noted that the rotor 10 in the present application is a rotor of a permanent magnet synchronous motor.

[0037] A permanent magnet synchronous motor (PMSM) is a synchronous motor that uses permanent magnets to generate a magnetic field. The speed of the rotor is consistent with the frequency of the current in the stator winding. The working principle of a permanent magnet synchronous motor is based on the interaction between the rotating magnetic field generated by the stator winding and the magnetic field generated by the permanent magnets on the rotor. The rotor is equipped with pre-magnetized permanent magnets, which can generate a strong magnetic field when rotating, thereby providing greater output torque. The motor control system will accurately regulate the current to ensure that the motor rotor can rotate synchronously with the rotating magnetic field and maintain a stable operating state.

[0038] Among them, the permanent magnets on the rotor are usually called magnetic steel or magnetic steel parts.

[0039] In the present application, "axial", "circumferential", and "radial" refer to the axial, circumferential, and radial directions of the rotor 10, respectively. In the embodiment of the present application, the axial, circumferential, and radial directions of the rotor 10, the rotor core 11, and the motor are all consistent.

[0040] It should be noted that the dimensions of different components in the three directions in the same absolute coordinate system are different. Generally, the length, width and thickness of the object are determined according to the dimensions of the object extending in the three directions, with length>width>thickness.

[0041] In the embodiment of the present application, the length direction, thickness direction, and width direction of the magnetic steel slot 11 c and the magnetic steel part 12 are consistent, and the length direction of the magnetic steel part 12 is parallel to the axial direction of the rotor 10 .

[0042] The rotor core 11 is provided with a plurality of magnetic steel slot groups 11 a along the circumferential direction, and the plurality of magnetic steel slot groups 11 a may be evenly distributed along the circumferential direction.

[0043] It can be understood that one magnetic steel slot group 11 a corresponds to one magnetic pole.

[0044] Exemplarily, the number of magnetic poles of the rotor 10 may be two, three, four, five, six, eight, ten or twelve, etc.

[0045] Each magnetic steel slot group 11a includes at least two magnetic steel slots 11c arranged in a V-shape with the openings facing outward, which means that a magnetic steel slot group 11a includes at least a V-shape formed by two magnetic steel slot groups 11a, wherein one end of the two magnetic steel slots 11c are adjacently arranged to form the bottom of the V-shape, and the other end forms the opening of the top of the V-shape, and the width direction of the two magnetic steel slots 11c has a certain angle.

[0046] Exemplarily, the direction from the bottom to the top of the V-shaped magnetic steel slot group 11 a is parallel to the radial direction of the rotor 10 .

[0047] It is understandable that the two magnetic steel grooves 11c may be connected or not connected at the bottom of the V-shape, and this is not limited here.

[0048] The two magnetic steel slots 11 c are symmetrical along a first axis s of the rotor 10 , wherein the first axis s passes through the central axis of the rotor 10 .

[0049] like Figure 3 and Figure 4 As shown, the first axis s is represented by s.

[0050] Exemplarily, the magnetic steel slots 11 c penetrate both side end surfaces of the rotor core 11 along the axial direction of the rotor core 11 .

[0051] One end of the magnetic steel slot 11c is close to the first axis s, and the other end is close to the side wall of the rotor core 11, which means that the two ends of the magnetic steel slot 11c along its width direction are respectively close to the first axis s and the outer wall of the rotor core 11, wherein the length direction of the magnetic steel slot 11c is parallel to the axial direction of the rotor 10.

[0052] The magnetic steel member 12 includes a main body 121 and magnetic steel end portions 122 disposed at both ends of the main body 121 along the width direction, wherein the main body 121 can be connected to the magnetic steel end portions 122 by gluing.

[0053] Exemplarily, the main body 121 and the magnetic steel end 122 are connected by insulating glue.

[0054] The thickness of the magnetic steel end portion 122 is greater than the thickness of the main body portion 121. Figure 5As shown, the thickness of the magnetic steel end 122 is represented by b, and the thickness of the main body 121 is represented by c. In this way, the magnetic steel end 122 arranged at both ends of the magnetic steel slot 11c in the width direction is close to the first axis s and the side wall of the rotor core 11 respectively. On the one hand, the increase in the thickness of the magnetic steel end 122 close to the first axis s can improve the anti-demagnetization ability of the magnetic steel part 12 close to the first axis s; on the other hand, the magnetic steel part 12 close to the side wall of the rotor core 11, that is, close to the air gap of the stator and rotor 10, can improve the anti-demagnetization ability of the magnetic steel part 12 close to the surface of the rotor 10 by increasing the thickness of the magnetic steel end 122 at this part; on the other hand, the thickness of the main body 121 is thinner than that of the magnetic steel end 122, which can reduce the magnetic resistance, increase the D-axis inductance, reduce the three-phase short-circuit current, and improve the continuous operation ability of the motor under fault conditions such as three-phase short circuit.

[0055] Exemplarily, the magnetic steel part 12 includes a high-temperature-resistant and high-performance permanent magnetic material.

[0056] Exemplarily, the ratio of the thickness c of the main body 121 to the thickness b of the magnetic steel end 122 is in the range of 0.6-0.9.

[0057] Exemplarily, the ratio of the thickness c of the main body 121 to the thickness b of the magnetic steel end 122 is 0.6, 0.65, 0.7, 0.75, 0.8, 0.85 or 0.9, etc., which is not limited here.

[0058] The rotor 10 provided in the embodiment of the present application is configured such that at least two magnetic steel slots 11c of the magnetic steel slot group 11a are arranged in a V-shape with the opening facing outward, and the magnetic steel slots 11c are symmetrical along the first axis s of the rotor 10, so that the magnetic steel part 12 arranged in the magnetic steel slot 11c has a magnetic steel end 122 at one end along the width direction close to the first axis s, and a magnetic steel end 122 at the other end close to the side wall of the rotor core 11, and the thickness of the two magnetic steel end 122 is greater than the thickness of the middle main body 121. In this way, the magnetic steel end 122 arranged at both ends of the magnetic steel slot 11c in the width direction are respectively close to the first axis s and the side wall of the rotor core 11 On the one hand, the increase in the thickness of the magnetic steel end 122 close to the first axis s can improve the anti-demagnetization ability of the magnetic steel part 12 close to the first axis s; on the other hand, the magnetic steel part 12 close to the side wall of the rotor core 11, that is, close to the air gap of the stator and rotor 10, can improve the anti-demagnetization ability of the magnetic steel part 12 close to the surface of the rotor 10 by increasing the thickness of the magnetic steel end 122 in this part; on the other hand, the thickness of the main body 121 is thinner than that of the magnetic steel end 122, which can reduce the magnetic resistance, increase the D-axis inductance, reduce the three-phase short-circuit current, and improve the continuous operation ability of the motor under fault conditions such as three-phase short circuit.

[0059] In some embodiments, the first axis s is the D-axis of the rotor 10 .

[0060] It should be noted that the D-axis refers to a direct-axis, wherein the direction of the D-axis is the same as the direction of the magnetic field of any magnetic pole on the rotor 10 , that is, they are parallel. The D-axis is the center line of any magnetic pole on the rotor 10 .

[0061] In the control of permanent magnet synchronous motors, in order to obtain control characteristics similar to those of DC motors, a coordinate system can be established on the rotor 10 of the motor. This coordinate system rotates synchronously with the rotor 10, and the magnetic field direction of any magnetic pole on the rotor 10 is taken as the D axis.

[0062] It can be understood that, since the rotor 10 of the motor has multiple magnetic poles, each magnetic pole corresponds to a first axis s, namely, the D axis, and a magnetic steel slot group 11a is distributed under each magnetic pole at a certain angle and symmetrical about the D axis.

[0063] Here, by setting the first axis s as the D-axis of the rotor 10, the two magnetic steel slots 11c of the magnetic steel slot group 11a are symmetrical along the D-axis, so that the magnetic steel end 122 of the magnetic steel part 12 arranged in the magnetic steel slot 11c close to one end of the D-axis in the width direction can have a certain thickness, thereby improving the anti-demagnetization performance of the magnetic steel part 12 close to one end of the D-axis.

[0064] In some other embodiments, the first axis s may also be an axis close to the D axis and having a certain angle with the D axis, which is not limited here.

[0065] For some examples, see Figure 3 to Figure 4 The magnetic steel slot group 11a includes two magnetic steel slot units 11b. Each magnetic steel slot unit 11b includes two magnetic steel slots 11c arranged in a V-shape with openings facing outward. The two magnetic steel slot units 11b are arranged at intervals along the first axis s.

[0066] In this embodiment, the magnetic steel slot group 11a includes two magnetic steel slot units 11b, and each magnetic steel slot unit 11b includes two magnetic steel slots 11c arranged in a V-shape with openings facing outwards, that is, one magnetic steel slot group 11a includes four magnetic steel slots 11c.

[0067] The two magnetic steel slot units 11b are spaced apart along the first axis s, which means that the two pairs of V-shaped magnetic steel slots 11c are spaced apart by a certain distance in the extending direction of the first axis s.

[0068] It should be noted that the two magnetic steel slots 11c in each magnetic steel slot unit 11b, which are arranged in a V-shape with their openings facing outward, are symmetrical about the first axis s, and one end of the magnetic steel slot 11c is close to the first axis s, and the other end is close to the side wall of the rotor core 11. In this way, in the magnetic steel slot group 11a, the magnetic steel slot 11c of the magnetic steel slot unit 11b close to the central axis is at least larger in the width direction than the magnetic steel slot 11c of the magnetic steel slot unit 11b far from the central axis.

[0069] In this way, by providing a double-layer V-shaped magnetic steel groove 11c, the contact area between the magnetic steel member 12 and the air gap is increased, making it easier for the magnetic flux to pass through the air gap, thereby improving the utilization rate of the magnetic flux.

[0070] For some examples, see Figures 4 to 5 One of the magnetic steel ends 122 of the magnetic steel part 12 is close to the first axis s, and the other magnetic steel end 122 is close to the side wall of the rotor core 11. The main body 121 and the magnetic steel ends 122 at both ends are flush with the side wall of one side of the magnetic steel part 12 in the thickness direction, and the other side wall forms a groove 12a.

[0071] The main body 121 and the magnetic steel end portions 122 at both ends are flush with the side walls along one side of the thickness direction of the magnetic steel part 12. That is, the side walls along one side of the thickness direction of the magnetic steel part 12 are flat, which is more conducive to assembly. At the same time, it simplifies the structure of the magnetic steel groove 11c and is more conducive to the processing of the magnetic steel groove 11c.

[0072] It can be understood that since the thickness of the main body 121 is smaller than the thickness of the magnetic steel end 122, when the side wall of the main body 121 and the magnetic steel end 122 at both ends along the thickness direction of the magnetic steel part 12 is flush, a groove 12a will be formed on the side wall on the other side.

[0073] In some other embodiments, the side walls of the two magnetic steel ends 122 and the main body 121 on both sides along the thickness direction are not flush, and grooves 12a are formed respectively. The grooves 12a on both sides can form a limit with the groove wall of the magnetic steel groove 11c, thereby improving the fixing effect of the magnetic steel groove 11c on the magnetic steel.

[0074] For some examples, see Figure 4 and Figure 5 The magnetic steel end portion 122 includes a connection layer 1222 and at least two first sub-blocks 1221. Two adjacent first sub-blocks 1221 are connected by the connection layer 1222, and each first sub-block 1221 is arranged along the width direction of the magnetic steel member 12.

[0075] It should be noted that the connection layer 1222 is made of insulating material, and the eddy current loss of the magnetic steel end 122 can be reduced by dividing the magnetic steel end 122 into at least two first blocks 1221 along the width direction.

[0076] It is understandable that the greater the number of first blocks 1221, the smaller the eddy current loss of the magnetic steel end 122, but at the same time, the smaller the width of the first block 1221, the easier it is for the structural strength of the first block 1221 to be reduced, and the easier it is for the first block 1221 to be physically damaged.

[0077] like Figure 5As shown, the dimension of the first block 1221 in the width direction of the magnetic steel part 12 is represented by d.

[0078] Exemplarily, a dimension d of the first block 1221 in the width direction of the magnetic steel part 12 ranges from 3 mm to 8 mm.

[0079] Exemplarily, the dimension d of the first block 1221 in the width direction of the magnetic steel part 12 is 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm or 8 mm, etc., which is not limited here.

[0080] It is understandable that, in the same magnetic steel end portion 122 , the sizes of the first blocks 1221 in the width direction of the magnetic steel member 12 may be the same or different.

[0081] Here, by dividing the magnetic steel end 122 into at least two first blocks 1221 along the width direction, the eddy current loss of the magnetic steel part 12 at the magnetic steel end 122 can be reduced, thereby reducing the temperature of the magnetic steel part 12 at the magnetic steel end 122 during the operation of the motor, and reducing the probability of demagnetization of the magnetic steel part 12 at the magnetic steel end 122 due to high temperature.

[0082] For some examples, see Figure 4 and Figure 5 The main body 121 includes a connection layer 1222 and at least two second sub-blocks 1211 . Two adjacent second sub-blocks 1211 are connected by the connection layer 1222 , and each second sub-block 1211 is arranged along the width direction of the magnetic steel member 12 .

[0083] The second blocks 1211 are arranged along the width direction of the magnetic steel member 12 , which means that the second blocks 1211 are formed by cutting the main body 121 along the width direction.

[0084] It should be noted that the connection layer 1222 is made of insulating material, and by dividing the main body 121 into at least two second blocks 1211 along the width direction, the eddy current loss of the main body 121 of the magnetic steel component 12 can be reduced.

[0085] like Figure 5 As shown, the dimension of the second block 1211 in the width direction of the magnetic steel part 12 is represented by e.

[0086] Exemplarily, the dimension e of the second block 1211 in the width direction of the magnetic steel part 12 ranges from 3 mm to 12 mm.

[0087] Exemplarily, a dimension e of the second block 1211 in the width direction of the magnetic steel part 12 is 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm or 12 mm, etc., which is not limited here.

[0088] It is understandable that, in the same main body 121 , the sizes of the second blocks 1211 in the width direction of the magnetic steel member 12 may be the same or different.

[0089] In this embodiment, by dividing the main body 121 into at least two second blocks 1211 along the width direction, the eddy current loss of the magnetic steel part 12 in the main body 121 can be reduced, thereby reducing the temperature of the magnetic steel part 12 in the main body 121 during the operation of the motor, and reducing the probability of demagnetization of the magnetic steel part 12 in the main body 121 due to high temperature.

[0090] In some embodiments, the two magnetic steel ends 122 of the magnetic steel part 12 each include a connecting layer 1222 and at least two first blocks 1221, and the main body 121 includes a connecting layer 1222 and at least two second blocks 1211. By cutting the magnetic steel ends 122 and the main body 121 of the magnetic steel part 12 into at least two first blocks 1221 and at least two second blocks 1211 along the width direction, the eddy current loss of the entire magnetic steel part 12 can be reduced, thereby reducing the overall temperature of the magnetic steel part 12 during the operation of the motor and reducing the probability of demagnetization of the magnetic steel part 12 due to high temperature.

[0091] Exemplarily, the two magnetic steel ends 122 of the magnetic steel member 12 each include a connecting layer 1222 and two first blocks 1221 , and the main body 121 includes a connecting layer 1222 and five second blocks 1211 .

[0092] For some examples, see Figure 5 , a dimension d of the first block 1221 in the width direction of the magnetic steel member 12 is smaller than a dimension e of the second block 1211 in the width direction of the magnetic steel member 12 .

[0093] It should be noted that, in this embodiment, the first block 1221 and the second block 1211 are respectively from the magnetic steel end portion 122 and the main body 121 on the same magnetic steel member 12 .

[0094] The size of the first block 1221 in the width direction of the magnetic steel part 12 is smaller than the size of the second block 1211 in the width direction of the magnetic steel part 12. That is to say, the blocks at both ends of the width direction of the magnetic steel part 12 where the eddy current loss is usually larger are more densely layered. In this way, the overall eddy current loss of the magnetic steel part 12 can be further reduced, and the probability of demagnetization of the magnetic steel part 12 due to high temperature can be reduced.

[0095] In some embodiments, a connection layer 1222 is disposed between the magnetic steel end portion 122 and the main body portion 121 .

[0096] That is to say, the magnetic steel end 122 and the main body 121 are connected to form an integral magnetic steel part 12 through the connecting layer 1222. The setting of the connecting layer 1222 can increase the magnetic resistance between the magnetic steel end 122 and the main body 121, thereby reducing the overall eddy current loss of the magnetic steel part 12.

[0097] In some embodiments, the magnetic steel member 12 installed in the same magnetic steel slot 11 c is divided into multiple segments along the axial direction, and the segments are connected by a connecting layer 1222 .

[0098] The multiple segments or multiples described in the embodiments of the present application refer to a number of two or more.

[0099] The magnetic steel part 12 is divided into multiple sections along the axial direction, which can also reduce the eddy current of the magnetic steel part 12, thereby reducing the temperature rise of the magnetic steel part 12 during operation, which is beneficial to the high-speed and stable operation of the rotor 10.

[0100] In some embodiments, the connection layer 1222 includes an insulating film and an insulating glue.

[0101] Exemplarily, the insulating film is coated on the first blocks 1221 , and the first blocks 1221 coated with the insulating film are bonded by insulating glue.

[0102] Exemplarily, both large surfaces of the insulating film are coated with insulating glue respectively, the insulating film serves as a base material of the insulating glue, and the insulating glue on both large surfaces of the insulating film is used to bond the first block 1221 respectively.

[0103] Exemplarily, the insulating film is a high insulating property thin film.

[0104] In this way, by using insulating film and insulating glue to bond each first block 1221, each second block 1211 or to bond the magnetic steel end 122 and the main body 121, the insulation performance of the connecting layer 1222 can be improved, thereby reducing the eddy current of the magnetic steel part 12.

[0105] For some examples, see Figure 5 , the size of each magnetic steel end portion 122 in the width direction of the magnetic steel component 12 is smaller than the size of the main body portion 121 in the width direction of the magnetic steel component 12 .

[0106] like Figure 5 As shown, the dimension of the magnetic steel end portion 122 in the width direction of the magnetic steel member 12 is represented by f, and the dimension of the main body portion 121 in the width direction of the magnetic steel member 12 is represented by g.

[0107] Exemplarily, the ratio of the dimension f of the magnetic steel end portion 122 in the width direction of the magnetic steel member 12 to the dimension g of the main body portion 121 in the width direction of the magnetic steel member 12 is in the range of 0.16-0.35.

[0108] Exemplarily, the ratio of the dimension f of the magnetic steel end 122 in the width direction of the magnetic steel part 12 to the dimension g of the main body 121 in the width direction of the magnetic steel part 12 is 0.16, 0.18, 0.2, 0.22, 0.25, 0.28, 0.3, 0.32 or 0.35, etc.

[0109] That is to say, by controlling the size of each magnetic steel end 122 in the width direction of the magnetic steel part 12, thicker magnetic steel end portions 122 are provided at the two ends in the width direction of the magnetic steel part 12 corresponding only to larger eddy currents, thereby saving material and reducing the influence of the increased thickness of the magnetic steel end portions 122 on the weak magnetic properties.

[0110] For some examples, see Figures 3 to 5 The magnetic steel groove 11c protrudes along the groove wall of the magnetic steel part 12 in the thickness direction to form a protrusion 11d. The protrusion 11d matches the groove 12a to limit the magnetic steel part 12 in the width direction.

[0111] Exemplarily, the protrusion 11d extends axially, and the groove 12a extends along the length direction of the magnetic steel part 12. In this way, the protrusion 11d of the magnetic steel groove 11c can guide the magnetic steel part 12 by cooperating with the groove 12a, which is beneficial to the installation of the magnetic steel part 12.

[0112] It should be noted that the number of protrusions 11d on the same magnetic steel groove 11c corresponds to the number of grooves 12a on the magnetic steel part 12. It can be one protrusion 11d formed on the groove wall on one side of the magnetic steel groove 11c along the thickness direction, or it can be two protrusions 11d formed on the groove walls on both sides of the magnetic steel groove 11c along the thickness direction.

[0113] It should be noted that, before the magnetic steel member 12 is placed in the magnetic steel groove 11 c, a primer may be coated in the magnetic steel groove 11 c.

[0114] The primer is an adhesion promoter used before coating, which is mainly used to improve the interface polarity or wettability of the substrate surface to enhance the adhesion between the coating and the substrate, thereby increasing the adhesion between the magnetic steel part 12 and the magnetic steel slot 11c.

[0115] In this way, by forming a protrusion 11d on the magnetic steel slot 11c, the protrusion 11d of the magnetic steel slot 11c matches the groove 12a of the magnetic steel part 12, which can improve the fixing effect of the magnetic steel slot 11c on the magnetic steel part 12 in the width direction of the magnetic steel part 12, thereby improving the overall compactness of the rotor 10, increasing the natural frequency of the rotor 10, and further improving the reliability of high-speed rotation of the rotor 10.

[0116] For some examples, see Figure 3 , along the width direction of the magnetic steel part 12, magnetic isolation cavities 11e are respectively provided at both ends of the magnetic steel groove 11c. The magnetic isolation cavity 11e is connected to the magnetic steel groove 11c. The groove walls of the magnetic steel groove 11c along the width direction of the magnetic steel part 12 respectively limit the magnetic steel part 12 in the width direction of the magnetic steel part 12.

[0117] The magnetic isolation cavity 11e is connected with the magnetic steel groove 11c, which means that part of the magnetic steel groove 11c is connected along the groove wall of the magnetic steel member 12 in the width direction, thereby realizing the connection between the magnetic steel groove 11c and the magnetic isolation cavity 11e at both ends of the magnetic steel groove 11c.

[0118] The groove walls of the magnetic steel groove 11c along the width direction of the magnetic steel part 12 respectively limit the magnetic steel part 12 in the width direction of the magnetic steel part 12, which means that the groove walls of the magnetic steel groove 11c along the width direction of the magnetic steel part 12 that do not penetrate the magnetic isolation cavity 11e are used to limit the magnetic steel part 12 in the width direction of the magnetic steel part 12.

[0119] Among them, the groove wall of the magnetic steel groove 11c used to limit the magnetic steel part 12, that is, the groove wall of the magnetic steel groove 11c that does not pass through the magnetic isolation cavity 11e, can be located at one end along the thickness direction of the magnetic steel part 12, or at the other end along the thickness direction of the magnetic steel part 12, or at both ends along the thickness direction of the magnetic steel part 12, and there is no limitation here.

[0120] In this embodiment, the magnetic isolation cavity 11e is used to fill the potting glue, and the potting glue is made of insulating material with a heat resistance grade of 200.

[0121] It should be noted that before the magnetic isolation cavity 11e is filled with glue, the magnetic isolation cavities 11e respectively provided at both ends of the magnetic steel groove 11c are conducive to the assembler to use the space of the magnetic isolation cavity 11e to place the magnetic steel part 12 into the magnetic steel groove 11c. At the same time, the groove walls on both sides of the magnetic steel groove 11c along the width direction of the magnetic steel part 12 can limit and guide the magnetic steel part 12, which is conducive to the installation of the magnetic steel part 12. After the magnetic isolation cavity 11e is filled with potting glue, the potting glue can fix the magnetic steel part 12 at both ends of the magnetic steel part 12 in the width direction, thereby improving the fixing strength of the magnetic steel part 12.

[0122] For some examples, see Figure 1 and Figure 2The rotor 10 also includes a rotating shaft 13 and a rotor pressing ring 14 made of low magnetic permeability and high strength non-magnetic steel. The two rotor pressing rings 14 are respectively connected with the rotating shaft 13 by interference fit, and a certain axial preload is applied between the two ends of the rotor core 11, thereby improving the compactness and reliability of the entire rotor 10.

[0123] Illustratively, after the rotor pressing ring 14 and the rotor core 11 of the transmission end of the rotor 10 are installed on the rotating shaft 13, during the process of assembling the rotor pressing ring 14 of the non-transmission end, a clamping force of 130 kN is applied to the rotor pressing ring 14 of the non-transmission end toward the rotor pressing ring 14 of the transmission end, so that there is a certain axial preload between the two rotor pressing rings 14, which is beneficial to the integrated production of the rotor 10 and improves the compactness and reliability of the entire rotor 10.

[0124] In some embodiments, after the rotor 10 is assembled, it can be vacuum dipped, and the insulating paint can be dipped into the tiny gaps on the rotor 10 by vacuum dipped, and a protective paint film can be formed on the surface, for example, the gaps between the rotor 10 punchings on the rotor core 11 formed by stacking the rotor 10 punchings.

[0125] In some embodiments, after the rotor 10 is assembled, it can be potted with glue, and the potting glue can be filled into the larger pores of the rotor 10 through the potting.

[0126] It should be noted that the process steps of vacuum dipping and glue pouring can be performed in any order. The vacuum dipping can be performed first and then glue pouring, or the glue pouring can be performed first and then vacuum dipping.

[0127] The use of vacuum varnishing and glue injection can increase the bonding force between the rotor core 11 and the magnetic steel part 12, so that the rotor core 11 and the magnetic steel part 12 are more compact, which is beneficial to improving the natural frequency of the rotor 10 and improving the reliability of the rotor 10.

[0128] For example, the insulating varnish, primer and potting compound in the present application all use insulating materials with a heat resistance grade of 200, that is, the maximum allowable operating temperature of the insulating varnish, primer and potting compound is 200°C.

[0129] For some examples, see Figure 3 The rotor core 11 is also provided with magnetic barrier holes 11f and ventilation holes 11g.

[0130] The magnetic barrier hole 11f is used to optimize the air gap magnetic flux waveform and reduce the harmonic distortion rate of the armature back electromotive force.

[0131] The ventilation holes 11g are used to cool the rotor core 11 with air, thereby reducing the temperature of the rotor 10 during operation.

[0132] A second aspect of the embodiments of the present application provides a motor, comprising the rotor 10 provided in any embodiment of the present application.

[0133] It should be noted that the motor may be a permanent magnet synchronous motor.

[0134] The motor provided in the embodiment of the present application is configured such that at least two magnetic steel slots 11c of the magnetic steel slot group 11a are arranged in a V-shape with the opening facing outward, and the magnetic steel slots 11c are symmetrical along the first axis s of the rotor 10, so that the magnetic steel part 12 arranged in the magnetic steel slot 11c has a magnetic steel end 122 at one end along the width direction close to the first axis s, and a magnetic steel end 122 at the other end close to the side wall of the rotor core 11, and the thickness of the two magnetic steel end 122 is greater than the thickness of the middle main body 121. In this way, the magnetic steel end 122 arranged at both ends of the magnetic steel slot 11c in the width direction are close to the first axis s and the side wall of the rotor core 11, respectively. On the one hand, the increase in the thickness of the magnetic steel end 122 close to the first axis s can improve the anti-demagnetization ability of the magnetic steel part 12 close to the first axis s; on the other hand, the magnetic steel part 12 close to the side wall of the rotor core 11, that is, the air gap part of the stator and rotor 10, can improve the anti-demagnetization ability of the magnetic steel part 12 close to the surface of the rotor 10 by increasing the thickness of the magnetic steel end 122 in this part; on the other hand, the thickness of the main body 121 is thinner than that of the magnetic steel end 122, which can reduce the magnetic resistance, increase the D-axis inductance, reduce the three-phase short-circuit current, and improve the continuous operation ability of the motor under fault conditions such as three-phase short circuit.

[0135] The various embodiments / implementations provided in this application can be combined with each other without causing any contradiction.

[0136] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A rotor, characterized in that: include: A rotor core, wherein the rotor core is provided with a plurality of magnetic steel slot groups along the circumferential direction, each of the magnetic steel slot groups comprises at least two magnetic steel slots arranged in a V-shape with openings facing outwards, the two magnetic steel slots are symmetrical along the first axis of the rotor, one end of the magnetic steel slot is close to the first axis, and the other end is close to the side wall of the rotor core; A magnetic steel part, the magnetic steel part is arranged in the magnetic steel slot, the magnetic steel part comprises a main body and magnetic steel end portions arranged at both ends of the main body along the width direction, and the thickness of the magnetic steel end portions is greater than the thickness of the main body; Wherein, the width direction of the magnetic steel part is perpendicular to the axial direction of the rotor.

2. The rotor according to claim 1, characterized in that The first axis is the D axis of the rotor; and / or, The magnetic steel slot group includes two magnetic steel slot units, each of the magnetic steel slot units includes two magnetic steel slots arranged in a V-shape with openings facing outward, and the two magnetic steel slot units are spaced apart along the first axis.

3. The rotor according to claim 1, characterized in that One of the magnetic steel ends of the magnetic steel part is close to the first axis, and the other magnetic steel end is close to the side wall of the rotor core. The main body and the magnetic steel ends at both ends are flush with the side wall on one side of the magnetic steel part along the thickness direction, and a groove is formed on the other side wall.

4. The rotor according to claim 3, characterized in that The magnetic steel end portion includes a connection layer and at least two first blocks, two adjacent first blocks are connected by the connection layer, and each of the first blocks is arranged along the width direction of the magnetic steel piece; and / or, The main body includes a connection layer and at least two second blocks, two adjacent second blocks are connected by the connection layer, and each of the second blocks is arranged along the width direction of the magnetic steel part.

5. The rotor according to claim 4, characterized in that A size of the first block in the width direction of the magnetic steel member is smaller than a size of the second block in the width direction of the magnetic steel member.

6. The rotor according to claim 4, characterized in that A connecting layer is provided between the end of the magnetic steel and the main body; and / or, The connection layer includes an insulating film and insulating glue.

7. The rotor according to claim 3, characterized in that The dimension of each of the magnetic steel ends in the width direction of the magnetic steel part is smaller than the dimension of the main body in the width direction of the magnetic steel part.

8. The rotor according to claim 3, characterized in that The groove wall of the magnetic steel groove protrudes along the thickness direction of the magnetic steel part to form a protrusion, and the protrusion matches the groove to limit the magnetic steel part in the width direction.

9. The rotor according to claim 1, characterized in that Along the width direction of the magnetic steel part, magnetic isolation cavities are respectively provided at both ends of the magnetic steel groove, and the magnetic isolation cavities are connected to the magnetic steel groove. The groove walls of the magnetic steel groove along the width direction of the magnetic steel part limit the magnetic steel part in the width direction of the magnetic steel part.

10. A motor, characterized in that: Comprising a rotor as claimed in any one of claims 1 to 9.

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