Segmented skewed pole type rotor core and motor rotor

Abstract

The utility model relates to the technical field of motors for electric motorcycles, and particularly discloses a segmented skewed pole type rotor iron core and a motor rotor, the center of each segmented iron core is provided with a shaft hole, the hole wall of the shaft hole is concavely provided with a plurality of pairs of mounting grooves, and the plurality of pairs of mounting grooves are arranged along the circumferential direction of the shaft hole. Each pair of mounting grooves is symmetrically arranged relative to the center of the segmented iron core, a plurality of pairs of magnetic steel grooves are uniformly distributed on the segmented iron core in an annular array, the segmented iron core is provided with a datum line, each pair of magnetic steel grooves are symmetrically arranged along the datum line, and an included angle is formed between the datum lines of any two adjacent segmented iron cores. By adopting the skewed pole type rotor iron core, magnetic field interference is avoided to a great extent, the NVH and high efficiency characteristics of the motor and the salient pole ratio of the motor are improved, the harmonic vibration and pulsating torque of the motor are reduced, and the stable operation of the motor is ensured. And a plurality of pairs of mounting grooves with different angles are integrated on a single segmented iron core, so that the purpose of multiple skewed pole angles and different numbers of rotor skewed poles can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of motors for electric motorcycles, in particular to a segmented oblique-pole rotor core and a motor rotor. Background Art

[0002] With the improvement of living standards, people pay more and more attention to the efficient use of energy. At the same time, the popularity of electric motorcycles, electric mopeds and electric bicycles has provided sufficient conditions for people to quickly enter a green and environmentally friendly life. It not only enriches people's travel methods, but also brings fun and convenience to riders. The variable frequency high-efficiency permanent magnet synchronous motor system as the output power is also widely used for its unique structural low complexity, high torque coefficient, high-precision control, good stability and low noise. It provides stable and reliable performance for electric vehicles. Therefore, continuously improving the performance of the motor and improving the power level of the motor have become more important for users' growing needs.

[0003] The inner rotor motors used in existing electric motorcycles mostly use a single embedded iron core as the rotor part, with a single magnetic circuit, and cannot completely avoid or exert the expected characteristics in terms of cogging torque, torque fluctuation, winding temperature rise, torque density and other related characteristics. Utility Model Content

[0004] The purpose of the utility model is to provide a segmented skew-pole rotor core and a motor rotor, which can optimize motor characteristics and further improve the stability of various motor performances.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] On the one hand, the utility model provides a segmented skew-pole rotor core, comprising:

[0007] A plurality of segmented iron cores are assembled along the axial direction, an axial hole is opened at the center of each segmented iron core, a plurality of pairs of mounting grooves are recessed on the hole wall of the axial hole, the plurality of pairs of mounting grooves are arranged along the circumference of the axial hole, and each pair of mounting grooves are symmetrically arranged relative to the center of the segmented iron core, a plurality of pairs of magnetic steel grooves are evenly arranged in an annular array on the segmented iron core, the plurality of pairs of magnetic steel grooves are used to place magnetic steel, the segmented iron core has a reference line, each pair of magnetic steel grooves are symmetrically arranged along the reference line, and the reference lines of any two adjacent segmented iron cores are arranged at an angle.

[0008] As a preferred technical solution of the above-mentioned segmented skew-pole rotor core, the angle between the reference lines of any two adjacent segmented cores is a skew-pole angle, and the skew-pole angle is 1°.

[0009] As a preferred technical solution of the above-mentioned segmented skew-pole type rotor core, a marking groove is recessed on the hole wall of the shaft hole of each said segmented core.

[0010] As a preferred technical solution of the above-mentioned segmented skew-pole type rotor core, the installation groove includes two first installation grooves, two second installation grooves, and two third installation grooves. The center lines corresponding to the two said first installation grooves are the first center line, and the first center line coincides with the reference line.

[0011] As a preferred technical solution of the above-mentioned segmented skew-pole type rotor core, the center lines corresponding to the two said second installation grooves are the second center line, and the included angle between the first center line and the second center line is 61°.

[0012] As a preferred technical solution of the above-mentioned segmented skew-pole type rotor core, the center lines corresponding to the two said third installation grooves are the third center line, and the included angle between the first center line and the third center line is 58°.

[0013] As a preferred technical solution of the above-mentioned segmented skew-pole type rotor core, the included angle between the second center line and the third center line is 61°.

[0014] As a preferred technical solution of the above-mentioned segmented skew-pole type rotor core, a plurality of weight-reducing holes are provided on the outer side wall of each said segmented core, and the plurality of weight-reducing holes are arranged along the circumferential direction of the segmented core.

[0015] On the other hand, the present utility model further provides a motor rotor, which includes a rotor shaft and the segmented skew-pole type rotor core described in any of the above solutions. The rotor shaft passes through the shaft hole and is key-connected to the segmented core.

[0016] As a preferred technical solution of the above-mentioned motor rotor, the motor rotor further includes a stator assembly, and the stator assembly is sleeved at intervals on the outer periphery of the segmented core and can drive the segmented core to rotate.

[0017] The beneficial effects of the present utility model are:

[0018] The present utility model provides a segmented skewed pole type rotor core and an electric motor rotor. The segmented skewed pole type rotor core includes a plurality of segmented cores, which are assembled axially. A shaft hole is formed in the center of each segmented core. A plurality of pairs of mounting grooves are recessed in the hole wall of the shaft hole. The plurality of pairs of mounting grooves are arranged circumferentially along the shaft hole, and each pair of mounting grooves is symmetrically arranged relative to the center of the segmented core. A plurality of pairs of magnet grooves are evenly arranged in a circular array on the segmented core. The plurality of pairs of magnet grooves are all used for placing magnets. The segmented core has a reference line, and each pair of magnet grooves is symmetrically arranged along the reference line. An included angle is formed between the reference lines of any two adjacent segmented cores. With such a setting, the rotor core in the skewed pole form can not only largely avoid the interference of the magnetic field, but also accelerate its heat dissipation, greatly improving the stability of the electric motor. Further, it can also improve the NVH of the electric motor, as well as the high-efficiency characteristics, increase the salient pole ratio of the electric motor, reduce the harmonic tremor and pulsating torque of the electric motor, and ensure the low-noise, high-efficiency and stable operation of the electric motor. In addition, the skewed pole form of the electric motor rotor will reduce the air gap between the stator and the rotor of the electric motor, thereby reducing the leakage magnetic flux, reducing the iron loss, and improving the efficiency of the electric motor. For the starting performance of the electric motor, the skewed pole of the rotor core can increase the starting torque of the electric motor and enhance the starting ability of the electric motor. Moreover, by adopting the structure of splicing a plurality of segmented cores and integrating a plurality of pairs of mounting grooves with different angles on a single segmented core, the purpose of achieving various skewed pole angles and different numbers of rotor skewed poles can be realized, greatly saving the development of multiple sets of rotor cores, and the skewed pole function of the rotor core can be achieved with only one set of molds. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural view of a single segmented core provided in an embodiment of the present utility model from a first perspective;

[0020] Figure 2 is a schematic structural view of a single segmented core provided in an embodiment of the present utility model from a second perspective;

[0021] Figure 3 is a schematic structural view of five segmented cores provided in an embodiment of the present utility model from a first perspective;

[0022] Figure 4 is a schematic structural view of five segmented cores provided in an embodiment of the present utility model from a second perspective.

[0023] Wherein:

[0024] 1, segmented core; 2, shaft hole; 3, mounting groove; 4, magnet groove; 5, marking groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] Embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present utility model, and should not be construed as limiting the present utility model.

[0026] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. These are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0027] Unless otherwise clearly specified and defined, the terms "installed", "connected", "connected to", "fixed" should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0028] Unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the first feature and the second feature being in direct contact, or may include the first feature and the second feature not being in direct contact but being in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "below", "beneath" and "under" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0029] The technical solution of the present utility model will be further described below in conjunction with the accompanying drawings and through specific embodiments.

[0030] As Figures 1 to 4As shown in the figure, this embodiment provides a segmented skewed pole type rotor core. The segmented skewed pole type rotor core includes a plurality of segmented cores 1, and the plurality of segmented cores 1 are assembled axially. A shaft hole 2 is provided at the center of each segmented core 1. A plurality of pairs of mounting grooves 3 are recessed on the inner wall of the shaft hole 2. The plurality of pairs of mounting grooves 3 are arranged along the circumferential direction of the shaft hole 2, and each pair of mounting grooves 3 is symmetrically arranged relative to the center of the segmented core 1. A plurality of pairs of magnet grooves 4 are arranged in a circular array on the segmented core 1, and the plurality of pairs of magnet grooves 4 are all used for placing magnets. The segmented core 1 has a reference line, and each pair of magnet grooves 4 is symmetrically arranged along the reference line. An included angle is provided between the reference lines of any two adjacent segmented cores 1. It should be noted that the reference line is Figure 1 L1 in

[0031] In this way, for the rotor core adopting the skewed pole form, it can not only avoid the interference of the magnetic field to a great extent, but also accelerate its heat dissipation, greatly improving the stability of the motor. Further, it can also improve the NVH of the motor and the high-efficiency characteristics, increase the saliency ratio of the motor, reduce the harmonic tremor and pulsating torque of the motor, and ensure the low-noise, high-efficiency and stable operation of the motor. In addition, the skewed pole form of the motor rotor will reduce the air gap between the motor stator and the rotor, thereby reducing the leakage magnetic flux, reducing the iron loss, and improving the motor efficiency. For the starting performance of the motor, the skewed pole of the rotor core can increase the starting torque of the motor and enhance the starting ability of the motor.

[0032] It should be noted that the segmented skewed pole type rotor core provided in this embodiment is applied to a high-power and high-speed motor. Exemplarily, it is applied to the inner rotor motor of an electric motorcycle.

[0033] Optionally, the included angle between the reference lines of any two adjacent segmented cores 1 is the skewed pole angle, and the skewed pole angle is 1°. Of course, in other embodiments, the size of the skewed pole angle can also be set according to actual needs and will not be further limited here.

[0034] Optionally, a marking groove 5 with a fixed angle is recessed on the inner wall of the shaft hole 2 of each segmented core 1. In this way, the front and back of the segmented core 1 can be distinguished, and the positions or angles of the respective mounting grooves 3 on the inner wall of the shaft hole 2 can be compared with the marking groove 5 as a reference.

[0035] Specifically, the following solution is exemplarily given in this embodiment: Five segmented cores 1 are assembled axially. The mounting grooves 3 include two first mounting grooves, two second mounting grooves, and two third mounting grooves. The center lines corresponding to the two first mounting grooves are the first center lines, and the first center lines coincide with the reference lines.

[0036] Optionally, the center lines corresponding to the two second mounting grooves are the second center line, and the included angle between the first center line and the second center line is 61°.

[0037] Optionally, the center lines corresponding to the two third mounting grooves are the third center line, and the included angle between the first center line and the third center line is 58°. It should be noted that the second center line and the third center line respectively correspond to Figure 1 L2 and L3 in

[0038] Optionally, the included angle between the second center line and the third center line is 61°.

[0039] Certainly, in other embodiments, the number of the segmented iron cores 1, as well as the quantity and angular settings of the mounting grooves 3, can all be set according to actual requirements, and no further limitations are made here.

[0040] Optionally, in order to further realize the light weight of the segmented iron core 1, a plurality of weight-reducing holes are provided on the outer side wall of each segmented iron core 1, and the plurality of weight-reducing holes are arranged along the circumferential direction of the segmented iron core 1.

[0041] This embodiment also provides a motor rotor, which includes a rotor shaft and the segmented skewed pole type rotor core in the above solution. The rotor shaft penetrates through the shaft hole 2 and is key-connected to the segmented iron core 1.

[0042] Optionally, the motor rotor further includes a stator assembly, and the stator assembly is sleeved on the outer periphery of the segmented iron core 1 at intervals and can drive the segmented iron core 1 to rotate.

[0043] Obviously, the above embodiments of the present utility model are merely examples for clearly explaining the present utility model, rather than limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the claims of the present utility model.

Claims

1. A segmented skew-pole rotor core, characterized in that: include: A plurality of segmented iron cores (1), wherein the plurality of segmented iron cores (1) are assembled along the axial direction, an axial hole (2) is opened at the center of each segmented iron core (1), a plurality of pairs of mounting grooves (3) are recessed on the hole wall of the axial hole (2), the plurality of pairs of mounting grooves (3) are arranged along the circumference of the axial hole (2), and each pair of mounting grooves (3) are symmetrically arranged relative to the center of the segmented iron core (1), a plurality of pairs of magnetic steel grooves (4) are evenly arranged in an annular array on the segmented iron core (1), the plurality of pairs of magnetic steel grooves (4) are used to place magnetic steel, the segmented iron core (1) has a reference line, each pair of magnetic steel grooves (4) are symmetrically arranged along the reference line, and the reference lines of any two adjacent segmented iron cores (1) are arranged at an angle.

2. The segmented skew-pole rotor core according to claim 1, characterized in that: The angle between the reference lines of any two adjacent segmented iron cores (1) is a skew angle, and the skew angle is 1°.

3. The segmented skew-pole rotor core according to claim 1, characterized in that: A marking groove (5) is recessed on the hole wall of the axial hole (2) of each segmented iron core (1).

4. The segmented skew-pole rotor core according to claim 1, characterized in that: The installation slots (3) comprise two first installation slots, two second installation slots, and two third installation slots, the center lines corresponding to the two first installation slots are first center lines, and the first center lines coincide with the reference line.

5. The segmented skew-pole rotor core according to claim 4, characterized in that: The center lines corresponding to the two second mounting grooves are the second center lines, and the angle between the first center line and the second center line is 61°.

6. The segmented skew-pole rotor core according to claim 5, characterized in that: The center line corresponding to the two third mounting grooves is the third center line, and the angle between the first center line and the third center line is 58°.

7. The segmented skew-pole rotor core according to claim 6, characterized in that: The angle between the second center line and the third center line is 61°.

8. The segmented skew-pole rotor core according to any one of claims 1 to 7, characterized in that: A plurality of weight-reducing holes are provided on the outer side wall of each segmented iron core (1), and the plurality of weight-reducing holes are arranged along the circumference of the segmented iron core (1).

9. A motor rotor, characterized in that: It comprises a rotor shaft and a segmented skew-pole rotor core as claimed in any one of claims 1 to 8, wherein the rotor shaft passes through the shaft hole (2) and is key-connected to the segmented core (1).

10. The motor rotor according to claim 9, characterized in that: The motor rotor also includes a stator assembly, which is sleeved at intervals on the outer circumference of the segmented iron core (1) and is capable of driving the segmented iron core (1) to rotate.

Images