Rotor structure and motor with same

Abstract

The utility model provides a rotor structure and a motor with the same. The rotor structure comprises a rotor iron core; a first magnetic steel groove and a second magnetic steel groove are formed in the rotor iron core with the axial face of the rotor iron core as a projection plane, in the radial direction of the rotor iron core, the first magnetic steel groove comprises a first groove body and a second groove body, and the second magnetic steel groove comprises a third groove body and a fourth groove body. A first magnetic steel, a second magnetic steel, a third magnetic steel and a fourth magnetic steel are respectively arranged in the first groove body, the second groove body, the third groove body and the fourth groove body; in the circumferential direction of the rotor iron core, the first groove body deflects towards the d axis by a first angle, and the fourth groove body deflects towards the d axis by a second angle. The first groove body and the fourth groove body are of an asymmetric structure relative to the d axis, and the first magnetic steel groove and the second magnetic steel groove are both segmental magnetic steel grooves, so that the utilization rate of magnetic steel can be improved, the trend of a magnetic circuit is improved to a great extent, the air gap flux density is optimized, and the radial electromagnetic force is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of motors, and in particular relates to a rotor structure and a motor with the rotor structure. Background Art

[0002] The air gap magnetic flux waveform generated by the permanent magnet of the variable frequency speed permanent magnet motor is similar to a square wave, which makes the air gap magnetic field contain a large number of harmonics. When the rotor structure is not designed properly, the harmonic content in the air gap magnetic field will be greater, increasing the harmonic loss in the stator core and the rotor core, reducing the efficiency of the permanent magnet motor, and causing the waveform quality of the air gap magnetic flux to deteriorate. In addition, the harmonic current and harmonic magnetic field will also produce additional torque fluctuations, causing vibration and noise of the motor.

[0003] At present, permanent magnet motors are increasingly widely used, requiring high motor efficiency and reduced energy consumption; small motor torque pulsation, easy system control, reliable and stable operation; low motor vibration and noise, meeting user comfort requirements. Due to the cost pressure of permanent magnets, compressor motors often have permanent magnets in a "single" or "V" shape distribution. Due to the limitation of the rotor core, the "single" shape distribution has a small amount of permanent magnets, which is limited in improving the magnetic field effect of the permanent magnets and increasing the amount of permanent magnets, while the "V" shape distribution has a low utilization rate of permanent magnets, resulting in low motor efficiency. Utility Model Content

[0004] The utility model provides a rotor structure and a motor with the rotor structure, which can solve the technical problem in the prior art that the utilization rate of "V"-shaped distributed permanent magnets is low, resulting in low motor efficiency.

[0005] The utility model provides a rotor structure, which includes a rotor core;

[0006] Taking the axial surface of the rotor core as the projection surface, the rotor core is provided with a first magnetic steel slot and a second magnetic steel slot, in the radial direction of the rotor core, ends of the first magnetic steel slot and the second magnetic steel slot facing the center of the rotor core are connected to each other, and ends of the first magnetic steel slot and the second magnetic steel slot facing the outer circle of the rotor core are away from each other;

[0007] The first magnetic steel slot includes a first slot body and a second slot body, the second magnetic steel slot includes a third slot body and a fourth slot body, the first slot body is arranged on the radial outside of the second slot body, the fourth slot body is arranged on the radial outside of the third slot body, the second slot body and the third slot body are symmetrically arranged about the d-axis, and the first slot body, the second slot body, the third slot body and the fourth slot body are respectively provided with the first magnetic steel, the second magnetic steel, the third magnetic steel and the fourth magnetic steel; in the circumferential direction of the rotor core, the first slot body is deflected toward the d-axis by a first angle, and the fourth slot body is deflected toward the d-axis by a second angle.

[0008] In some embodiments, the first angle is smaller than the second angle.

[0009] In some embodiments, in the circumferential direction of the rotor core, the angle between the extension line of the radial inner side of the second slot body and the extension line of the radial inner side of the first slot body is φ2, and the angle φ2 is the first angle; the angle between the extension line of the radial inner side of the third slot body and the extension line of the radial inner side of the fourth slot body is φ3, and the angle φ3 is the second angle;

[0010] Wherein, the angle φ2 satisfies: 5°≤φ2≤10°; and the angle φ3 satisfies: 20°≤φ3≤30°.

[0011] In some embodiments, in the radial direction of the rotor core, the second slot body and the third slot body have the same length, and the length of the first slot body is greater than the length of the fourth slot body.

[0012] In some embodiments, the length of the first slot body is L2, the angle φ2 and the length L2 satisfy: 0.5≤φ2*L2≤0.9; the length of the fourth slot body is L3, the angle φ3 and the length L3 satisfy: 1.5≤φ3*L3≤2.3.

[0013] In some embodiments, the length of the second slot body and the third slot body is L1, and the length L1 satisfies: 6.2mm≤L1≤6.5mm; the length of the first slot body is L2, and the length L2 satisfies: 5.2mm≤L2≤6mm; the length of the fourth slot body is L3, and the length L3 satisfies: 4mm≤L3≤5mm;

[0014] The width of the second groove body and the third groove body is d1, the width of the first groove body is d2, and the width of the second groove body is d3. The width d1, the width d2, and the width d3 satisfy: 1.5mm≤d1=d2=d3≤1.8mm.

[0015] In some embodiments, the second slot body and the third slot body are connected to each other at one end toward the rotor core, and in the radial direction of the rotor core, the vertical distance between the inner side edge of the connection between the second slot body and the third slot body and the center of the rotor core is h1, and the distance h1 satisfies: 16mm≤h1≤17.2mm.

[0016] In some embodiments, a plurality of magnetic flux sorting grooves are arranged between the first magnetic steel slot and the second magnetic steel slot, and the magnetic flux sorting groove includes a rectangular segment, a first circular arc segment and a second circular arc segment, and both ends of the rectangular segment are respectively connected to the first circular arc segment and the second circular arc segment, the first circular arc segment is close to the outer circle of the rotor core, and the second circular arc segment faces the first magnetic steel slot or the second magnetic steel slot.

[0017] In some embodiments, in the circumferential direction of the rotor core, a first magnetic flux sorting groove is arranged between the first slot body and the d-axis, and a vertical distance from the center of the second arc segment of the first magnetic flux sorting groove to the radial inner side edge of the first slot body is h2; a second magnetic flux sorting groove is arranged between the fourth slot body and the d-axis, and a vertical distance from the center of the second arc segment of the second magnetic flux sorting groove to the radial inner side edge of the fourth slot body is h3, and the distance h2 satisfies: 0.8mm≤h2≤1.2mm, and the distance h3 satisfies: 1mm≤h3≤1.5mm.

[0018] A motor comprises a rotor structure, wherein the rotor structure is the above-mentioned rotor structure.

[0019] The utility model provides a rotor structure and a motor having the rotor structure, which has the following beneficial effects:

[0020] The first magnetic steel slot and the second magnetic steel slot are both segmentable magnetic steel slots. The first magnetic steel slot is segmented to form the first slot body and the second slot body, and the second magnetic steel slot is segmented to form the third slot body and the fourth slot body. Based on this, the first slot body and the fourth slot body are the outermost slot bodies, so the first magnetic steel slot and the second magnetic steel slot do not need to be deflected as a whole, and only the first slot body and the fourth slot body need to be deflected. Due to the different deflection angles of the first slot body and the fourth slot body, the first slot body and the fourth slot body are asymmetric structures about the d-axis, and compared with the undeflected first slot body and the fourth slot body, the first slot body and the fourth slot body of this embodiment are closer to the outer circle of the rotor core, which can improve the utilization rate of the magnetic steel, greatly improve the direction of the magnetic circuit, optimize the air gap magnetic density, reduce the radial electromagnetic force, reduce the electromagnetic noise and vibration of the motor, and improve the efficiency of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the implementation or the prior art description. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0022] Figure 1 A schematic diagram of a rotor structure of an embodiment of the utility model;

[0023] Figure 2 A schematic diagram of a first angle and a second angle of an embodiment of the utility model;

[0024] Figure 3 Schematic diagram of the length L1, length L2 and length L3 of an embodiment of the utility model;

[0025] Figure 4 Schematic diagram of width d1, width d2 and width d3 of an embodiment of the utility model;

[0026] Figure 5 Schematic diagram of the first to fourth magnetic steels according to an embodiment of the present utility model;

[0027] Figure 6 Schematic diagram of distance h1, distance h2 and distance h3 of an embodiment of the utility model;

[0028] Figure 7 is a schematic diagram of a motor using the rotor structure of this embodiment;

[0029] Figure 8 The radial electromagnetic force waveform diagram in the prior art;

[0030] Fig. 9 The radial electromagnetic force waveform diagram using the rotor structure of this embodiment;

[0031] Fig.10 Comparison chart of motor efficiency between the prior art and the motor using the rotor structure of this embodiment;

[0032] Fig.11 A simulation diagram of the effect of adopting the rotor structure of this embodiment.

[0033] Figures: 1-rotor core; 2-first magnetic steel slot; 3-second magnetic steel slot; 21-first slot body; 22-second slot body; 201-first magnetic steel; 202-second magnetic steel; 31-third slot body; 32-fourth slot body; 301-third magnetic steel; 302-fourth magnetic steel; 4-magnetic flux sorting slot; 401-first magnetic flux sorting slot; 402-second magnetic flux sorting slot; 5-stator. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0035] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0036] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0037] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0038] See also Figure 1 and Figure 2As shown, according to an embodiment of the utility model, a rotor structure is provided, which includes a rotor core 1; with the axial surface of the rotor core 1 as the projection surface, a first magnetic steel slot 2 and a second magnetic steel slot 3 are provided on the rotor core 1, and in the radial direction of the rotor core 1, the first magnetic steel slot 2 and the second magnetic steel slot 3 are connected to each other at one end facing the center of the rotor core 1, and the first magnetic steel slot 2 and the second magnetic steel slot 3 are separated from each other at one end facing the outer circle of the rotor core 1; the first magnetic steel slot 2 includes a first slot body 21 and a second slot body 22, and the second magnetic steel slot 3 includes a third slot body 31 and the fourth slot body 32, the first slot body 21 is arranged on the radial outside of the second slot body 22, the fourth slot body 32 is arranged on the radial outside of the third slot body 31, the second slot body 22 and the third slot body 31 are symmetrically arranged about the d-axis, and the first slot body 21, the second slot body 22, the third slot body 31 and the fourth slot body 32 are respectively provided with the first magnetic steel 201, the second magnetic steel 202, the third magnetic steel 301 and the fourth magnetic steel 302; in the circumferential direction of the rotor core 1, the first slot body 21 is deflected toward the d-axis by a first angle, and the fourth slot body 32 is deflected toward the d-axis by a second angle.

[0039] Specifically, the first magnetic steel slot 2 and the second magnetic steel slot 3 are connected to each other at one end facing the center of the rotor core 1, and the first magnetic steel slot 2 and the second magnetic steel slot 3 are far away from each other at one end facing the outer circle of the rotor core 1. Since the first slot body 21 and the second slot body 22 are both deflected toward the d-axis by a certain angle, the first magnetic steel slot 2 and the second magnetic steel slot 3 form an asymmetric V-shaped magnetic steel slot as a whole.

[0040] In this embodiment, the first magnetic steel slot 2 and the second magnetic steel slot 3 are both segmentable magnetic steel slots. The first magnetic steel slot 2 is segmented to form a first slot body 21 and a second slot body 22, and the second magnetic steel slot 3 is segmented to form a third slot body 31 and a fourth slot body 32. Based on this, the first slot body 21 and the fourth slot body 32 are the outermost slot bodies, so the first magnetic steel slot 2 and the second magnetic steel slot 3 do not need to be deflected as a whole, and only the first slot body 21 and the fourth slot body 32 need to be deflected. Since the deflection angles of the first slot body 21 and the fourth slot body 32 are different, the first slot body 21 and the fourth slot body 32 are asymmetric structures about the d-axis, and compared with the undeflected first slot body 21 and the fourth slot body 32, the first slot body 21 and the fourth slot body 32 of this embodiment are closer to the outer circle of the rotor core 1, which can improve the utilization rate of the magnetic steel, greatly improve the direction of the magnetic circuit, optimize the air gap flux density, reduce the radial electromagnetic force, reduce the electromagnetic noise and vibration of the motor, and improve the efficiency of the motor.

[0041] It is worth noting that the second slot body 22 and the third slot body 31 are symmetrical about the d axis, and the second slot body 22 and the third slot body 31 can be connected to each other at one end facing the rotor core 1, or the second slot body 22 and the third slot body 31 are not connected, but another magnetic steel slot is provided, and the magnetic steel slot connects the second slot body 22 and the third slot body 31. In this embodiment, the preferred implementation is that the first slot body 21 and the second slot body 22 are connected to each other, and a shoulder is provided at the connection point to limit the first magnetic steel 201 and the second magnetic steel 202 respectively, and the third slot body 31 and the fourth slot body 32 are also connected to each other, and a shoulder is provided at the connection point to limit the third magnetic steel 301 and the fourth magnetic steel 302 respectively. In other embodiments, the first slot body 21 and the second slot body 22, the third slot body 31 and the fourth slot body 32 are not connected but form a magnetic isolation bridge. This setting method has the risk of magnetic leakage relative to the rotor structure of this embodiment, which will affect the efficiency of the motor.

[0042] See also Figure 1 and Figure 2 As shown, the first angle is smaller than the second angle.

[0043] In this embodiment, although the first slot body 21 and the fourth slot body 32 are both deflected toward the d-axis, the deflection angles of the two are different, so that the first slot body 21 and the fourth slot body 32 form an asymmetric structure relative to the d-axis, which can improve the utilization rate of the magnetic steel, greatly improve the direction of the magnetic circuit, optimize the air gap magnetic density, reduce the radial electromagnetic force, reduce the electromagnetic noise and vibration of the motor, and improve the motor efficiency.

[0044] See also Figure 1 and Figure 2 As shown, in the circumferential direction of the rotor core 1, the angle between the extension line of the radial inner side of the second slot body 22 and the extension line of the radial inner side of the first slot body 21 is φ2, and the angle φ2 is the first angle; the angle between the extension line of the radial inner side of the third slot body 31 and the extension line of the radial inner side of the fourth slot body 32 is φ3, and the angle φ3 is the second angle; wherein, the angle φ2 satisfies: 5°≤φ2≤10°; and the angle φ3 satisfies: 20°≤φ3≤30°.

[0045] In this embodiment, since only the first slot body 21 and the fourth slot body 32 need to deflect, in the radial direction of the second slot body 22, the first slot body 21 deflects, and the extension line of the radial inner side of the second slot body 22 is taken as the reference line. If the first slot body 21 does not deflect, the radial inner side of the first slot body 21 coincides with the reference line. When the first slot body 21 deflects, an angle exists between the extension line of the radial inner side of the second slot body 22 and the extension line of the radial inner side of the first slot body 21. Similarly, in the radial direction of the third slot body 31, the fourth slot body 32 deflects, and the extension line of the radial inner side of the third slot body 31 is taken as the reference line. If the fourth slot body 32 does not deflect, the radial inner side of the fourth slot body 32 coincides with the reference line. When the fourth slot body 32 deflects, an angle exists between the extension line of the radial inner side of the third slot body 31 and the extension line of the radial inner side of the fourth slot body 32. The angle φ2 satisfies 5°≤φ2≤10°, and the angle φ3 satisfies 20°≤φ3≤30°. Within this range, the utilization rate of the magnetic steel can be improved, the direction of the magnetic circuit can be greatly improved, the air gap magnetic density can be optimized, the radial electromagnetic force can be reduced, the electromagnetic noise and vibration of the motor can be reduced, and the motor efficiency can be improved.

[0046] See also Figure 1 and Figure 3 As shown, in the radial direction of the rotor core 1 , the second slot body 22 and the third slot body 31 have the same length, and the length of the first slot body 21 is greater than the length of the fourth slot body 32 .

[0047] In this embodiment, the second slot body 22 and the third slot body 31 are not deflected and have the same length. Since the first slot body 21 and the fourth slot body 32 are deflected, that is, the first slot body 21 and the fourth slot body 32 are closer to the outer circle of the rotor core 1, the length of the first magnetic steel slot 2 and the fourth magnetic steel slot 302 can be reduced, and the weight of the magnetic steel installed in the magnetic steel slot can be changed, thereby reducing the cost.

[0048] See also Figures 1 to 3 As shown, the length of the first slot body 21 is L2, and the angle φ2 and the length L2 satisfy: 0.5≤φ2*L2≤0.9; the length of the fourth slot body 32 is L3, and the angle φ3 and the length L3 satisfy: 1.5≤φ3*L3≤2.3.

[0049] In this embodiment, when the angle φ2 and the length L2 satisfy 0.5≤φ2*L2≤0.9, and the angle φ3 and the length L3 satisfy 1.5≤φ3*L3≤2.3, the air gap magnetic flux waveform is better, the motor efficiency is stable, and a certain distance is left between the first slot body 21 and the fourth slot body 32 and the outer circle of the rotor core 1 to prevent the first slot body 21 and the fourth slot body 32 from exceeding the outer circle of the rotor core 1.

[0050] As a specific implementation, the second slot body 22 is connected to the third slot body 31, and the included angle between the radial inner side edge of the second slot body 22 and the radial inner side edge of the third slot body 31 is φ1, and the included angle φ1 satisfies: 110°≤φ1≤130°.

[0051] See also Figure 3 and Figure 4 As shown, the length of the second groove body 22 and the third groove body 31 is L1, and the length L1 satisfies: 6.2mm≤L1≤6.5mm; the length of the first groove body 21 is L2, and the length L2 satisfies: 5.2mm≤L2≤6mm; the length of the fourth groove body 32 is L3, and the length L3 satisfies: 4mm≤L3≤5mm; the width of the second groove body 22 and the third groove body 31 is d1, the width of the first groove body 21 is d2, and the width of the second groove body 22 is d3, and the width d1, the width d2 and the width d3 satisfy: 1.5mm≤d1=d2=d3≤1.8mm, and the units of length and width are both mm.

[0052] In this embodiment, the lengths of the second slot body 22 and the third slot body 31 are kept the same, that is, 6.2mm≤L1≤6.5mm. Since the first slot body 21 and the fourth slot body 32 are deflected toward the d-axis, the magnetic steel is closer to the outer circle of the rotor, thereby improving the utilization rate of the magnetic steel. Therefore, the lengths of the first slot body 21 and the fourth slot body 32 can be appropriately reduced to reduce costs. The length of the first slot body 21 needs to satisfy 5.2mm≤L2≤6mm, and the length of the fourth slot body 32 needs to satisfy 4mm≤L3≤5mm. The slot body width is 1.5mm≤d1=d2=d3≤1.8mm, and the units of length and width are both mm.

[0053] As a specific implementation method, in order to meet the assembly requirements, refer to Figure 5 As shown, the length of the first magnetic steel 201 is L5, the length L5 = L2-0.1mm, the width is d5, and the width d5 ​​= d2-0.1mm; the length of the second magnetic steel 202 and the third magnetic steel 301 is L4mm, the length L4 = L1-0.1mm, the width is d4, and the width d4 = d1-0.1mm; the length of the fourth magnetic steel 302 is L6, the length L6 = d3-0.1mm, the width is d6, and the width d6 = d3-0.1mm.

[0054] See also Figure 6 As shown, the second slot body 22 and the third slot body 31 are connected to each other at one end facing the rotor core 1. In the radial direction of the rotor core 1, the vertical distance between the inner side edge of the connection between the second slot body 22 and the third slot body 31 and the center of the rotor core 1 is h1, and the distance h1 satisfies: 16mm≤h1≤17.2mm.

[0055] In this embodiment, in order to ensure that the magnetic steel slot as a whole does not interfere with the outer circle of the rotor core 1, that is, to leave a certain distance between the magnetic steel slot and the outer circle of the rotor core 1, the vertical distance between the inner side edge of the connection between the second slot body 22 and the third slot body 31 and the center of the rotor core 1 can be limited to ensure that a certain distance is left between the end of the first slot body 21 and the fourth slot body 32 facing the outer circle of the rotor core 1 and the outer circle of the rotor core 1.

[0056] See also Figure 6 As shown, a plurality of magnetic flux sorting grooves 4 are arranged between the first magnetic steel groove 2 and the second magnetic steel groove 3. The magnetic flux sorting grooves 4 include a rectangular segment, a first circular arc segment and a second circular arc segment. The two ends of the rectangular segment are respectively connected to the first circular arc segment and the second circular arc segment. The first circular arc segment is close to the outer circle of the rotor core 1, and the second circular arc segment faces the first magnetic steel groove 2 or the second magnetic steel groove 3.

[0057] In this embodiment, six magnetic flux sorting slots 4 are provided. Since the rotor core 1 is formed by stacking silicon steel sheets, the magnetic permeability of the silicon steel sheets is relatively high, and the magnetic permeability of the air in the magnetic flux sorting slots 4 is relatively low, by arranging slots of specific shapes near the outer circle of the rotor core 1, the distribution of the magnetic field can be changed, and the trajectory of the magnetic lines of force can be sorted, thereby improving the magnetic field distribution in the air gap. The number and shape of the magnetic flux sorting slots 4 may not adopt the shape of this embodiment.

[0058] See also Figure 6 As shown, in the circumferential direction of the rotor core 1, a first magnetic flux sorting groove 401 is arranged between the first slot body 21 and the d-axis, and the vertical distance from the center of the second arc segment of the first magnetic flux sorting groove 401 to the radial inner side of the first slot body 21 is h2; a second magnetic flux sorting groove 402 is arranged between the fourth slot body 32 and the d-axis, and the vertical distance from the center of the second arc segment of the second magnetic flux sorting groove 402 to the radial inner side of the fourth slot body 32 is h3, and the distance h2 satisfies: 0.8mm≤h2≤1.2mm, and the distance h3 satisfies: 1mm≤h3≤1.5mm, and the unit of the distance is mm.

[0059] In this embodiment, it is obtained through simulation that the distance h2 satisfies 0.8mm≤h2≤1.2mm, and the distance h3 satisfies 1mm≤h3≤1.5mm, which can ensure the mechanical strength of the rotating core structure between the magnetic flux sorting slot 4 and the magnetic steel slot. The size and position parameters of the magnetic flux sorting slot 4 defined in this embodiment are obtained through motor parameterized simulation to optimize the air gap magnetic flux waveform and eliminate the high-order harmonics of the motor air gap magnetic flux.

[0060] Referring to Figure 10 , a motor includes a rotor structure, and the rotor structure is the above-mentioned rotor structure.

[0061] The first magnetic steel slot 2 and the second magnetic steel slot 3 are both segmentable magnetic steel slots. The first magnetic steel slot 2 is segmented to form a first slot body 21 and a second slot body 22. The second magnetic steel slot 3 is segmented to form a third slot body 31 and a fourth slot body 32. Based on this, the first slot body 21 and the fourth slot body 32 are the outermost slot bodies, so the first magnetic steel slot 2 and the second magnetic steel slot 3 do not need to be deflected as a whole, and only the first slot body 21 and the fourth slot body 32 need to be deflected. Since the deflection angles of the first slot body 21 and the fourth slot body 32 are different, the first slot body 21 and the fourth slot body 32 are asymmetric structures about the d-axis. The first slot body 21 and the fourth slot body 32 of this embodiment are closer to the outer circle of the rotor core 1, reducing the length of the first magnetic steel slot 2 and the fourth magnetic steel 302 slot, changing the weight of the magnetic steel installed in the magnetic steel slot, thereby reducing the cost, and can improve the utilization rate of the magnetic steel, greatly improve the direction of the magnetic circuit, optimize the air gap flux density, reduce the radial electromagnetic force, reduce the electromagnetic noise and vibration of the motor, and improve the efficiency of the motor.

[0062] See also Figures 7 to 11 As shown in the figure, the radial electromagnetic force waveform and the motor efficiency comparison diagram under different efficiencies, the radial electromagnetic force is the force generated by the uneven distribution of the motor current and magnetic field. When the air gap magnetic density sinusoidal degree increases, it is more uniform, which will reduce the electromagnetic force generated in the radial direction of the motor. As shown in the figure, the radial electromagnetic force is reduced by 1.67% compared with the original utility model, which makes the motor vibration noise lower than the original motor, and the motor efficiency of the utility model is improved at all frequencies.

[0063] It is worth noting that the motor includes a stator 5 and a rotor. The rotor in this embodiment is built into the stator 5 and the rotor adopts the rotor structure of this embodiment.

[0064] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0065] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention. The above are only preferred implementations of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention, and these improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A rotor structure, characterized in that: include: A rotor core (1); Taking the axial surface of the rotor core (1) as a projection surface, the rotor core (1) is provided with a first magnetic steel slot (2) and a second magnetic steel slot (3); in the radial direction of the rotor core (1), the ends of the first magnetic steel slot (2) and the second magnetic steel slot (3) facing the center of the rotor core (1) are connected to each other, and the ends of the first magnetic steel slot (2) and the second magnetic steel slot (3) facing the outer circle of the rotor core (1) are away from each other; The first magnetic steel slot (2) comprises a first slot body (21) and a second slot body (22); the second magnetic steel slot (3) comprises a third slot body (31) and a fourth slot body (32); the first slot body (21) is arranged radially outside the second slot body (22); the fourth slot body (32) is arranged radially outside the third slot body (31); the second slot body (22) and the third slot body (31) are arranged symmetrically about the d-axis; the first slot body (21), the second slot body (22), the third slot body (31) and the fourth slot body (32) are respectively provided with a first magnetic steel (201), a second magnetic steel (202), a third magnetic steel (301) and a fourth magnetic steel (302); in the circumferential direction of the rotor core (1), the first slot body (21) is deflected toward the d-axis by a first angle, and the fourth slot body (32) is deflected toward the d-axis by a second angle.

2. The rotor structure according to claim 1, characterized in that: The first angle is smaller than the second angle.

3. The rotor structure according to claim 1, characterized in that: In the circumferential direction of the rotor core (1), the angle between the extension line of the radial inner side of the second slot body (22) and the extension line of the radial inner side of the first slot body (21) is an angle φ2, and the angle φ2 is the first angle; the angle between the extension line of the radial inner side of the third slot body (31) and the extension line of the radial inner side of the fourth slot body (32) is φ3, and the angle φ3 is the second angle; Wherein, the angle φ2 satisfies: 5°≤φ2≤10°; and the angle φ3 satisfies: 20°≤φ3≤30°.

4. The rotor structure according to claim 3, characterized in that: In the radial direction of the rotor core (1), the second slot body (22) and the third slot body (31) have the same length, and the length of the first slot body (21) is greater than the length of the fourth slot body (32).

5. The rotor structure according to claim 4, characterized in that: The length of the first slot body (21) is length L2, and the angle φ2 and the length L2 satisfy: 0.5≤φ2*L2≤0.9; the length of the fourth slot body (32) is L3, and the angle φ3 and the length L3 satisfy: 1.5≤φ3*L3≤2.

3.

6. The rotor structure according to claim 4, characterized in that: The lengths of the second groove body (22) and the third groove body (31) are L1, and the length L1 satisfies: 6.2 mm ≤ L1 ≤ 6.5 mm; the length of the first groove body (21) is L2, and the length L2 satisfies: 5.2 mm ≤ L2 ≤ 6 mm; the length of the fourth groove body (32) is L3, and the length L3 satisfies: 4 mm ≤ L3 ≤ 5 mm; The width of the second groove body (22) and the third groove body (31) is d1, the width of the first groove body (21) is d2, and the width of the second groove body (22) is d3. The width d1, the width d2, and the width d3 satisfy: 1.5 mm ≤ d1 = d2 = d3 ≤ 1.8 mm.

7. The rotor structure according to claim 1, characterized in that: The second slot body (22) and the third slot body (31) are connected to each other at one end facing the rotor core (1); in the radial direction of the rotor core (1), the vertical distance between the radial inner side edge of the connection between the second slot body (22) and the third slot body (31) and the center of the rotor core (1) is h1, and the distance h1 satisfies: 16mm≤h1≤17.2mm.

8. The rotor structure according to any one of claims 1 to 7, characterized in that: A plurality of magnetic flux sorting grooves (4) are arranged between the first magnetic steel groove (2) and the second magnetic steel groove (3), and the magnetic flux sorting grooves (4) include a rectangular segment, a first circular arc segment and a second circular arc segment, and the two ends of the rectangular segment are respectively connected to the first circular arc segment and the second circular arc segment, the first circular arc segment is close to the outer circle of the rotor core (1), and the second circular arc segment faces the first magnetic steel groove (2) or the second magnetic steel groove (3).

9. The rotor structure according to claim 8, characterized in that: In the circumferential direction of the rotor core (1), a first magnetic flux sorting groove (401) is provided between the first slot body (21) and the d-axis, and the vertical distance from the center of the second arc segment of the first magnetic flux sorting groove (401) to the radial inner side of the first slot body (21) is h2; a second magnetic flux sorting groove (402) is provided between the fourth slot body (32) and the d-axis, and the vertical distance from the center of the second arc segment of the second magnetic flux sorting groove (402) to the radial inner side of the fourth slot body (32) is h3, and the distance h2 satisfies: 0.8mm≤h2≤1.2mm, and the distance h3 satisfies: 1mm≤h3≤1.5mm.

10. A motor, comprising a rotor structure, characterized in that: The rotor structure is the rotor structure according to any one of claims 1 to 9.

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