Rotor core, rotor assembly and motor
By setting a first convex key and a second convex key in the inner hole of the rotor core, and using the difference in included angle to make multiple rotor cores flip and stack, the problems of low manufacturing efficiency and high cost of multi-segment cores are solved, realizing high-efficiency manufacturing and low-cost rotor cores, which meet the skew angle and cooling requirements of motors.
Patent Information
- Application Number
- CN202423134271.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-18
- Publication Date
- 2025-11-18
- Estimated Expiration
- 2034-12-18
AI Technical Summary
In existing technologies, the manufacturing efficiency of multi-segment iron cores is low and the manufacturing cost is high, making it difficult to meet the requirements of multi-slant pole angles and reduced flow resistance in motors.
By setting a first convex key and a second convex key in the inner hole of the rotor core, and using different included angles, multiple rotor cores can be flipped and stacked to form a skewed pole angle. Only one mold is needed to manufacture multiple rotor cores, thus achieving the staggered pole effect.
It improves the manufacturing efficiency of the rotor core, reduces manufacturing costs, meets the skew angle requirements of the motor, and optimizes the cooling effect.
Smart Images
Figure CN223567402U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to motor technical field, especially a rotor core, rotor assembly and motor. BACKGROUND
[0002] In order to meet the performance and excellent NVH performance of motor, adopt skew angle when electromagnetism design to reach this purpose.Skew angle usually adopts the core of many sections to form by pole reversal, in order to meet pole reversal effect, need to use many cores to punch manufacturing, thereby increase die cost and motor production cost.
[0003] Traditional core manufacturing meets the functional requirement of many skew angles and reduces flow resistance, usually adopts the rotor core of many types of keys to manufacture, on one hand, the manufacturing efficiency of many cores is low, on the other hand, needs to adopt different dies to manufacture, increases manufacturing cost. UTILITY MODEL CONTENTS
[0004] The utility model aims at providing a rotor core, rotor assembly and motor to solve the problems in prior art, improve the manufacturing efficiency of rotor core and reduce manufacturing cost.
[0005] Firstly, the utility model provides a rotor core, including:
[0006] A plurality of magnetic units, a plurality of magnetic units are evenly distributed along the circumferential direction of the rotor core;
[0007] First key, the first key is arranged in the inner hole of the rotor core;
[0008] Second key, the second key is arranged in the inner hole of the rotor core;
[0009] Wherein:
[0010] The center of the first key and the center point of the inner hole of the rotor core have a first connecting line, the center point of the inner hole of the rotor core and the center of the magnetic unit closest to the first key have a second connecting line, and the first connecting line and the second connecting line have a first preset included angle;
[0011] The center of the second key and the center point of the inner hole of the rotor core have a third connecting line, the center point of the inner hole of the rotor core and the center of the magnetic unit closest to the second key have a fourth connecting line, and the third connecting line and the fourth connecting line have a second preset included angle, and the second preset included angle and the first preset included angle have a difference.
[0012] As described above, a rotor core, wherein, preferably, the first preset included angle is 0 °.
[0013] The utility model provides a rotor assembly, comprising:
[0014] A rotating shaft;
[0015] A plurality of rotor core assemblies are stacked on the rotating shaft in sequence, wherein each rotor core assembly comprises a first rotor core, a second rotor core and a third rotor core, and each rotor core is formed by turning or rotating the aforementioned rotor core.
[0016] Preferably, the first rotor core comprises a first surface and a second surface arranged oppositely, the second rotor core is formed by turning the first rotor core in a first direction, the second rotor core is stacked on the first surface of the first rotor core, and the third rotor core is formed by turning the first rotor core in the first direction and then turning it in a second direction, and the third rotor core is stacked on the second surface of the first rotor core.
[0017] Preferably, the rotor core assembly comprises two rotor core assemblies, and the two rotor core assemblies are symmetrically stacked on the rotating shaft in sequence.
[0018] Preferably, the rotating shaft is provided with two key grooves, the two key grooves extend along the axis direction of the rotating shaft, and the two key grooves can be matched with the first key and the second key respectively.
[0019] Preferably, the first rotor core is provided with a plurality of first oil holes, the plurality of first oil holes are uniformly distributed on the first rotor core, the second rotor core is provided with a plurality of second oil holes, the plurality of second oil holes are uniformly distributed on the second rotor core, the third rotor core is provided with a plurality of third oil holes, the plurality of third oil holes are uniformly distributed on the third rotor core, and the number and position of the first oil holes, the second oil holes and the third oil holes are matched.
[0020] When the first rotor core, the second rotor core and the third rotor core form the rotor core assembly, each first oil hole is coaxial with the corresponding second oil hole and third oil hole.
[0021] Preferably, the utility model further comprises two end plates, the two end plates are arranged on the rotating shaft, and the two end plates abut against the two second rotor cores respectively.
[0022] The rotor assembly as described above, preferably, a plurality of oil inlet holes and a plurality of oil outlet holes are arranged on the end plate, and the plurality of oil inlet holes and the plurality of oil outlet holes are uniformly distributed on the end plate, and each oil inlet hole is communicated with a second oil hole.
[0023] In a third aspect, the utility model provides a motor, including foregoing rotor assembly.
[0024] Compared with the prior art, the utility model discloses a first key and a second key are arranged in the inner hole of the rotor core, and a first preset angle and a second preset angle are formed between the first key and the second key and the center point of the inner hole of the rotor core and the magnetic key unit, so that the skew angle can be formed by turning over and stacking the plurality of rotor cores, thereby achieving the purpose of meeting the skew angle of the motor by using only the rotor core with one key structure, improving the manufacturing efficiency of the rotor core and effectively reducing the manufacturing cost. BRIEF DESCRIPTION OF DRAWINGS
[0025] Figure 1 It is the perspective view of the rotor core provided by the embodiment of the utility model;
[0026] Figure 2 It is the front view of the rotor core provided by the embodiment of the utility model;
[0027] Figure 3 It is the perspective view of the rotor assembly provided by the embodiment of the utility model;
[0028] Figure 4 It is the explosion view of the rotor assembly provided by the embodiment of the utility model;
[0029] Figure 5 It is the perspective view of the rotating shaft provided by the embodiment of the utility model;
[0030] Figure 6 It is the front view of the rotating shaft provided by the embodiment of the utility model;
[0031] Figure 7 It is the perspective view of the end plate provided by the embodiment of the utility model;
[0032] Figure 8 It is the front view of the end plate provided by the embodiment of the utility model.
[0033] BRIEF DESCRIPTION OF DRAWINGS
[0034] 10-rotor core, 11-first key, 12-second key, 13-magnetic key unit, 14-inner hole;
[0035] 20 - rotor assembly, 21 - rotor shaft, 211 - keyway, 212 - limiting plate, 22 - rotor core assembly, 221 - first rotor core, 2211 - first surface, 2212 - second surface, 2213 - first oil hole, 222 - second rotor core, 2221 - second oil hole, 223 - third rotor core, 2231 - third oil hole, 23 - end plate, 231 - oil inlet hole, 232 - oil outlet hole, 233 - oil guide channel, 234 - positioning key;
[0036] L1 - first connecting line, L2 - second connecting line, L3 - third connecting line, L4 - fourth connecting line. DETAILED DESCRIPTION
[0037] The embodiments described below with reference to the drawings are exemplary and are only used to explain the utility model and cannot be explained as a limitation of the utility model.
[0038] In a first aspect, with reference to Figure 1 and Figure 2 The utility model provides a rotor core 10, be equipped with magnetic key unit 13, first key 11 and second key 12 on rotor core 10, wherein:
[0039] Magnetic key unit 13 includes multiple, multiple magnetic key unit 13 is evenly distributed along the circumferential direction of rotor core 10.Magnetic key unit 13 is used to generate magnetic field, and magnetic key unit 13 and rotor core 10 jointly constitute the magnetic circuit of motor, in motor, through the magnetic field generated by magnetic key unit 13 and the magnetic field generated by stator interact, and then generate torque drive motor rotation.
[0040] First key 11 and second key 12 are all arranged in the inner hole 14 of rotor core 10, and the center of first key 11 and the center point of the inner hole 14 of rotor core 10 have first connecting line L1, the center point of the inner hole 14 of rotor core 10 and the center of the magnetic key unit 13 closest to first key 11 have second connecting line L2, and first connecting line L1 and second connecting line L2 have first preset angle, and the first preset angle represents the angle of first connecting line L1 relative to second connecting line L2.
[0041] The center of second key 12 and the center point of the inner hole 14 of rotor core 10 have third connecting line L3, and the center point of the inner hole 14 of rotor core 10 and the center of the magnetic key unit 13 closest to second key 12 have fourth connecting line L4, and third connecting line L3 and fourth connecting line L4 have second preset angle, and the second preset angle represents the angle of third connecting line L3 relative to fourth connecting line L4.
[0042] The present application is formed by turning over different angles of multiple rotor cores 10 and then laminating to form an inclined pole angle. In order to form the inclined pole angle between different rotor cores 10, the second preset included angle is different from the first preset included angle. Regardless of how the rotor core 10 is turned over, the adjacent rotor cores 10 always have a misaligned pole, thereby always having an inclined pole angle.
[0043] When multiple rotor cores 10 are laminated, the multiple rotor cores 10 can be turned over according to the misaligned pole requirement, so that the multiple rotor cores 10 have an inclined pole angle, thereby only one die is used for stamping manufacturing, effectively reducing the manufacturing cost of the rotor core 10 and improving the manufacturing efficiency of the rotor core 10.
[0044] In the embodiments provided in the present application, as shown in Figure 2 The first key 11 and the second key 12 are arranged at positions close to the opposite inner holes 14 of the rotor core 10. The first preset included angle is 0°, that is, the first connecting line L1 coincides with the second connecting line L2, and the second preset included angle is (X / 2)°, that is, the third connecting line is offset relative to the fourth connecting line, that is, the first key 11 and the second key 12 are respectively located at the endpoints of two different diameters of the inner hole 14 of the rotor core 10. When multiple rotor cores 10 are stacked, as long as the multiple rotor cores 10 are turned over or rotated at different angles and then stacked, the adjacent rotor cores 10 can form an inclined pole angle.
[0045] Compared with the prior art, which forms an inclined pole angle by misaligned lamination of multiple cores, the present application only needs to use the same rotor core 10 with the same key structure, and the adjacent rotor cores 10 are turned over and rotated at different angles and then laminated to achieve an inclined pole angle. Therefore, only one set of dies is needed to manufacture the same rotor core 10, the manufacturing efficiency of the rotor core 10 is high, and the manufacturing cost can be effectively reduced.
[0046] In a second aspect, as shown in Figure 3 The utility model provides a rotor assembly 20, including the shaft 21 and multiple rotor core assemblies 22, wherein:
[0047] Multiple rotor core assemblies 22 are sequentially stacked on the shaft 21, and the rotor core assembly 22 includes a first rotor core 221, a second rotor core 222 and a third rotor core 223. The first rotor core 221, the second rotor core 222 and the third rotor core 223 are all formed by turning over or rotating the aforementioned rotor core 10.
[0048] When the first rotor core 221, the second rotor core 222 and the third rotor core 223 are flipped through different angles or directions and are stacked in sequence to form the rotor core assembly 22 with skew poles, a plurality of rotor core assemblies 22 are stacked in sequence on the rotating shaft 21, and the rotor assembly 20 with skew pole angles can be formed.
[0049] In the embodiments provided in the present application, refer to Figure 2 and refer to Figure 4 It is shown that the first rotor core 221 includes oppositely arranged first surface 2211 and second surface 2212, and the second rotor core 222 is formed by flipping the first rotor core 221 in the first direction. The first direction is the direction of rotating the rotating shaft 21 by 180° clockwise with the axis direction of the rotating shaft 21 as the rotating shaft 21. The second rotor core 222 is stacked on the first surface 2211 of the first rotor core 221. Before flipping, the third connecting line L3 is located on the left side of the fourth connecting line L4. After flipping by 180°, the third connecting line L3 is located on the right side of the fourth connecting line L4. Compared with before flipping, the third connecting line L3 has an angle offset of X°, thereby forming a skew pole angle of X°. The skew pole angle between the second rotor core 222 and the first rotor core 221 can be recorded as -X°.
[0050] The third rotor core 223 is formed by flipping the first rotor core 221 in the first direction and then flipping in the second direction. The second direction is the direction of rotating the rotating shaft 21 by 180° with the axis direction of the rotating shaft 21 and the rotating shaft 21 of the first rotor core 221 as the rotating shaft 21. The third rotor core 223 is stacked on the second surface 2212 of the first rotor core 221. After the first flipping, the third rotor core 223 and the first rotor core 221 form a skew pole angle of -X°. After the second flipping, a skew pole angle in the opposite direction of -X° is formed. Thus, the skew pole angle between the third rotor core 223 and the first rotor core 221 can be recorded as X°.
[0051] By taking the first rotor core 221 as a reference, different flipping of the second rotor core 222 and the third rotor core 223 is made, and the skew pole angles of the second rotor core 222, the first rotor core 221 and the third rotor core 223 are -X°→0°→X° in sequence.
[0052] In a feasible implementation, the rotor core assembly 22 includes two rotor core assemblies 22 which are symmetrically stacked in sequence on the rotating shaft 21. Refer to Figure 3 and Figure 4 It is shown that the two third rotor cores 223 of the two rotor core assemblies 22 abut together, and the two second rotor cores 222 are located away from the third rotor core 223 in the same rotor core assembly 22.
[0053] When the two rotor core assemblies 22 are installed on the rotating shaft 21, in order to ensure that the skew angle between the rotor cores 10 remains unchanged, the relative positions between the first rotor core 221, the second rotor core 222 and the third rotor core 223 need to be fixed.
[0054] In the embodiments provided in the present application, as shown in Figure 5 and Figure 6 , two key grooves 211 are arranged on the rotating shaft 21, both of which extend along the axis direction of the rotating shaft 21, and the two key grooves 211 can be matched with the positions of the first protruding key 11 and the second protruding key 12 respectively. When the first rotor core 221, the second rotor core 222 and the third rotor core 223 are all installed on the rotating shaft 21, the first protruding key 11 and the second protruding key 12 of each rotor core 10 can extend into the corresponding key groove 211, thereby preventing the first rotor core 221, the second rotor core 222 and the third rotor core 223 from being deviated in the circumferential direction of the rotating shaft 21, and causing the skew angle to change.
[0055] In order to reduce the flow resistance of the rotor core 10 and achieve the effect of cooling the rotor core 10, as shown in Figure 4 , a plurality of first oil holes 2213 are arranged on the first rotor core 221, and the plurality of first oil holes 2213 are uniformly distributed on the first rotor core 221. A plurality of second oil holes 2221 are arranged on the second rotor core 222, and the plurality of second oil holes 2221 are uniformly distributed on the second rotor core 222. A plurality of third oil holes 2231 are arranged on the third rotor core 223, and the plurality of third oil holes 2231 are uniformly distributed on the third rotor core 223. The number and position of the first oil holes 2213, the second oil holes 2221 and the third oil holes 2231 are matched.
[0056] When the first rotor core 221, the second rotor core 222 and the third rotor core 223 form the rotor core assembly 22, each first oil hole 2213 is coaxial with the corresponding second oil hole 2221 and third oil hole 2231, thereby maximizing the cooling effect of using oil holes.
[0057] In the embodiments provided in the present application, the first rotor core 221, the second rotor core 222 and the third rotor core 223 are essentially the same type of rotor core 10, but when forming the rotor core assembly 22, the second rotor core 222 and the third rotor core 223 need to be flipped in different directions from the first rotor core 221 to form the skew angle. When stamping the rotor core 10 using a mold to form the oil holes, if all the rotor cores 10 are stamped at the same position, the oil holes at the same position will be misaligned after the rotor cores 10 are flipped in different directions, which will ultimately affect the cooling effect of the oil holes.
[0058] In an embodiment, the rotor core 10 is stamped by a progressive die (also known as a continuous die or multi-position progressive die) to form the oil hole. According to the requirement of the skew angle of the rotor core 10, the corresponding angle of the progressive die is adjusted according to the skew angle of the rotor core 10 during stamping, and the corresponding rotor core 10 is stamped. Specifically, when the second rotor core 222 is stamped, the progressive die is rotated by the corresponding angle according to the required skew angle between the second rotor core 222 and the first rotor core 221, and then the second rotor core 10 is stamped. The third rotor core 223 is also stamped in the same way.
[0059] Based on the above embodiment, when the rotor core 10 is stamped to form the oil hole, only one die is needed to stamp multiple oil holes, and the multiple oil holes formed by stamping have good cooling effect. Without the need to replace multiple dies for stamping, the flow resistance is reduced while the cost of the die is reduced.
[0060] When the rotor core assembly 22 is installed on the rotating shaft 21, the key groove 211 provided on the rotating shaft 21 can only limit the rotor core 10 from deviating in the circumferential direction of the rotating shaft 21, but cannot limit the rotor core 10 from moving along the axis of the rotating shaft 21.
[0061] To solve the above problem, in the embodiments provided by the present application, as shown in Figure 3 and Figure 5 , the rotor assembly 20 further comprises two end plates 23, both of which are arranged on the rotating shaft 21. One end of the rotating shaft 21 is further provided with a limiting plate 212. Before installing the rotor core 10, one end plate 23 is first installed, so that the end plate 23 abuts against the limiting plate 212. The limiting plate 212 is used to fix the position of the end plate 23 on the rotating shaft 21. Then, the two rotor core assemblies 22 are installed on the rotating shaft 21 in sequence. Finally, the other end plate 23 is installed on the rotating shaft 21. Since the two rotor core assemblies 22 are symmetrically installed on the rotating shaft 21, each end plate 23 abuts against the outer side surface of the second rotor core 222 of one rotor core assembly 22, so as to fix the two rotor core assemblies 22 on the rotating shaft 21 by the two end plates 23, thereby preventing the two rotor core assemblies 22 from moving along the axis of the rotating shaft 21.
[0062] Further, as shown in Figure 7 and Figure 8 , the inner hole of the end plate 23 is provided with two positioning keys 234, which correspond to the positions of the two key grooves 211 on the rotating shaft 21, so as to limit the movement of the end plate 23 in the circumferential direction of the rotating shaft 21, thereby further improving the stability of the overall structure of the rotor assembly 20.
[0063] Continuing to refer toFigure 7 and Figure 8 As shown in the drawings, in order to facilitate cooling of the rotor core 10, a plurality of oil inlet holes 231 and oil outlet holes 232 are arranged on the end plate 23, the plurality of oil inlet holes 231 and the plurality of oil outlet holes 232 are uniformly distributed on the end plate 23, each oil inlet hole 231 is communicated with the second oil hole 2221 on the adjacent second rotor core 222 through an oil guide channel 233, the cooling oil flows through the oil guide channel 233 from the oil inlet hole 231 into the second oil hole 2221, and then cools the inside of the rotor core 10, and finally flows out of the oil outlet hole 232 after flowing through each part needing to be cooled, so that cooling is realized.
[0064] In a third aspect, the utility model provides a kind of motor, comprising the rotor assembly 20 of preceding description. Since the rotor assembly 20 of preceding description has the rotor core assembly 22 capable of forming skew angle, in turn can satisfy the demand of motor skew angle, and since only the rotor core 10 with a kind of key structure is used to realize the requirement of skew angle, reduce the manufacturing cost of rotor core 10, in turn also can reduce the production cost of motor.
[0065] The above embodiment according to the drawings has explained the structure, features and effect of the utility model in detail, the above-mentioned is only the preferred embodiment of the utility model, but the utility model is not limited to the drawing shown in the implementation range, any change or modification according to the concept of the utility model, or equivalent embodiment of equivalent change, still does not exceed the spirit of the specification and drawing, should be within the protection scope of the utility model.
Claims
1. A rotor core characterized by, Comprising: a plurality of magnetic pole units, the plurality of magnetic pole units being uniformly distributed along a circumferential direction of the rotor core; a first key, the first key being provided in an inner hole of the rotor core; a second key, the second key being provided in the inner hole of the rotor core; wherein: a first connecting line is between a center of the first key and a center point of the inner hole of the rotor core, a second connecting line is between the center point of the inner hole of the rotor core and a center of a magnetic pole unit closest to the first key, a first preset included angle is between the first connecting line and the second connecting line; a third connecting line is between a center of the second key and the center point of the inner hole of the rotor core, a fourth connecting line is between the center point of the inner hole of the rotor core and a center of a magnetic pole unit closest to the second key, a second preset included angle is between the third connecting line and the fourth connecting line, the second preset included angle is different from the first preset included angle.
2. The rotor core according to claim 1, characterized by The first preset included angle is 0°.
3. A rotor assembly characterized by, Comprising: a rotating shaft; a plurality of rotor core assemblies, the plurality of rotor core assemblies being sequentially stacked on the rotating shaft, the rotor core assembly comprising a first rotor core, a second rotor core and a third rotor core, the first rotor core, the second rotor core and the third rotor core each being formed by flipping or rotating the rotor core according to any one of claims 1 to 2.
4. The rotor assembly of claim 3, wherein, The first rotor core comprises oppositely arranged first and second surfaces, the second rotor core is formed by flipping the first rotor core in a first direction, the second rotor core is stacked on the first surface of the first rotor core, and the third rotor core is formed by flipping the first rotor core in the first direction and then flipping it in a second direction, the third rotor core being stacked on the second surface of the first rotor core.
5. The rotor assembly of claim 4, wherein, The rotor core assembly comprises two rotor core assemblies, the two rotor core assemblies being symmetrically stacked on the rotating shaft in sequence.
6. The rotor assembly of claim 5, wherein, The rotating shaft is provided with two key grooves, the two key grooves each extending along an axis direction of the rotating shaft, and the two key grooves can be matched with the first key and the second key respectively.
7. The rotor assembly of claim 6, wherein The first rotor core is provided with a plurality of first oil holes, the plurality of first oil holes being uniformly distributed on the first rotor core, the second rotor core is provided with a plurality of second oil holes, the plurality of second oil holes being uniformly distributed on the second rotor core, and the third rotor core is provided with a plurality of third oil holes, the plurality of third oil holes being uniformly distributed on the third rotor core, the number and position of the first oil holes, the second oil holes and the third oil holes being matched with each other. When the first rotor core, the second rotor core and the third rotor core form the rotor core assembly, each first oil hole is coaxial with the corresponding second oil hole and third oil hole.
8. The rotor assembly of claim 7, wherein, The rotating shaft is further provided with two end plates, the two end plates being arranged on the rotating shaft and respectively abutting against the two second rotor cores.
9. The rotor assembly of claim 8, wherein, The end plate is provided with a plurality of oil inlet holes and a plurality of oil outlet holes, the plurality of oil inlet holes and the plurality of oil outlet holes being uniformly and spacedly distributed on the end plate, and each oil inlet hole being communicated with a second oil hole.
10. An electric machine characterized by The rotor assembly of any one of claims 3 to 9.