Pole piece, rotor skew pole structure and motor

Abstract

The utility model relates to permanent magnet motor technical field especially is a kind of magnetic pole lamination, rotor skew pole structure and motor. The magnetic pole lamination includes magnetic pole lamination body, the magnetic pole lamination body includes fixedly connected first installation part and second installation part, and the first installation through-hole for fixing permanent magnet is provided with several along the thickness direction of first installation part, and several first installation through-hole is along magnetic pole lamination body center line symmetry distribution;The inner surface of second installation part is compatible with the outer surface of rotor magnet yoke, and the inner surface of second installation part is equipped with the positioning boss compatible with the positioning recess on the outer surface of rotor magnet yoke, and several second installation through-hole compatible with fixing piece is provided with along the thickness direction of second installation part;The center line X of positioning boss is eccentric to the center line Y of magnetic pole lamination body, and several second installation through-hole is along the center line X of positioning boss symmetry distribution.

Description

Technical Field

[0001] This utility model relates to the field of permanent magnet motor technology, and in particular to a magnetic pole lamination, a rotor skew pole structure, and a motor. Background Technology

[0002] With the continuous development of technology, modern industry has placed more and higher demands on the application of electric motors. Low noise, low vibration, and high efficiency are inevitable trends in motor development. To meet these requirements, generators often employ stator skewed slots or rotor skewed poles to reduce harmonic potential, cogging torque, and torque ripple. Skewed slot or skewed pole designs enable the motor to generate two opposite and symmetrical axial forces after energization, with a resultant force that is essentially zero. This effectively weakens the high-frequency additional radial electromagnetic force introduced by frequency converter power supply, effectively reducing electromagnetic noise and vibration, thereby improving the motor's operational stability and reliability. Simultaneously, it can significantly reduce motor losses and increase motor efficiency.

[0003] For small motors, the skewed slot structure is usually achieved through machining, which is a relatively complex process. For large motors, skewed slots are typically achieved using specialized tooling with inclined slot templates during core lamination. However, both methods present significant challenges in ensuring the correct slot angle, making it difficult to achieve a precise skew angle. Furthermore, compared to straight slot structures, skewed slot structures require more copper wire in the coils, leading to increased motor costs. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a magnetic pole lamination, a rotor skewed pole structure and a motor. By segmenting and interleaving the magnetic poles equipped with permanent magnets, the harmonic potential, cogging torque and torque fluctuation of the generator can be reduced. High-precision skewed poles can be achieved without special tooling, and at the same time, the amount of copper wire used in the coil is saved compared with the skewed slot structure.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: In a first aspect, this utility model provides a magnetic pole lamination, which includes a magnetic pole lamination body. The magnetic pole lamination body includes a first mounting part and a second mounting part fixedly connected. A plurality of first mounting through holes for fixing permanent magnets are provided through the first mounting part along its thickness direction. The plurality of first mounting through holes are symmetrically distributed along the center line of the magnetic pole lamination body. The inner surface of the second mounting part is adapted to the outer surface of the rotor yoke, and the inner surface of the second mounting part is provided with a positioning boss adapted to the positioning groove on the outer surface of the rotor yoke. A plurality of second mounting through holes adapted to fixing members are provided through the second mounting part along its thickness direction. The center line X of the positioning boss is eccentrically set relative to the center line Y of the magnetic pole lamination body, and the plurality of second mounting through holes are symmetrically distributed along the center line X of the positioning boss.

[0006] Furthermore, the inner surface of the second mounting part is provided with a plurality of bolt through holes corresponding to and communicating with the second mounting through hole, and the fastener is provided with threaded holes corresponding to the positions of the bolt through holes.

[0007] Furthermore, the number of the first mounting through holes is three, and the number of the second mounting through holes is two.

[0008] Furthermore, the positioning groove extends axially along the outer surface of the rotor yoke.

[0009] Furthermore, multiple positioning grooves on the outer surface of the rotor yoke are evenly distributed along the circumference of the rotor yoke.

[0010] Furthermore, the outer surface of the first mounting part is an arc-shaped surface with a radius smaller than the rotor diameter, and the inner surface is fixedly connected to the second mounting part.

[0011] Secondly, this utility model also provides a rotor skewed pole structure, which includes the magnetic pole laminations described in the first aspect, and also includes a rotor yoke and a plurality of magnetic pole units connected to the outer surface of the rotor yoke. Each magnetic pole unit is made by stacking a plurality of magnetic pole lamination bodies, and the plurality of magnetic pole lamination bodies are arranged alternately in opposite directions along the axial direction of the magnetic pole unit.

[0012] Thirdly, this utility model also provides an electric motor, which includes the rotor skew pole structure described in the second aspect.

[0013] The beneficial effects of this utility model are: 1. The rotor skewed pole structure of this utility model achieves skewed poles through the alternating forward and reverse arrangement of a single-structure magnetic pole lamination body, effectively reducing the generator's harmonic potential, cogging torque, and torque fluctuation. When the magnetic pole units are arranged in a specific manner to form a skewed pole structure, the motor generates two axial forces in opposite directions and symmetrically when energized, with a resultant force that is essentially zero. This effectively weakens the high-frequency additional radial electromagnetic force introduced by the frequency converter power supply. Consequently, electromagnetic noise and vibration are reduced, the motor's operational stability and reliability are improved, and motor losses are reduced, motor efficiency is increased, meeting the modern industrial requirements for low noise, low vibration, and high efficiency in motors.

[0014] 2. The rotor skewed pole structure of this utility model can achieve high-precision skewed poles without special tooling, greatly simplifying the processing flow compared to traditional skewed slot structure processing methods. In small motors, traditional skewed slot structures are achieved through machining, which is complex; in large motors, skewed slots are achieved using special tooling with inclined slot templates during core lamination, making it difficult to guarantee the slot inclination. This application only requires alternating forward and reverse arrangements of the single-structure magnetic pole lamination body, reducing processing difficulty, decreasing reliance on special tooling, improving production efficiency, and reducing uncertainties and errors in the production process. Furthermore, it saves on the amount of coil copper wire compared to the skewed slot structure, directly reducing the raw material cost of the motor. In motor production, coil copper wire is a significant cost component; reducing copper wire usage can save considerable costs in large-scale production. In addition, since no special tooling is required, the costs of purchasing, maintaining, and replacing tooling are avoided, further reducing production costs.

[0015] 3. The magnetic pole laminations described in this utility model adopt a single structure, requiring only one set of production molds for manufacturing. This eliminates the need to design and manufacture multiple sets of molds for different types of laminations, significantly reducing mold development costs and production preparation time. The magnetic pole units formed by stacking these single-structure magnetic pole laminations can achieve skewed poles through alternating positive and negative arrangements. During assembly, there is no need to distinguish between different lamination types, reducing identification and classification steps in the assembly process and lowering the risk of assembly errors due to confusion in lamination types. Attached Figure Description

[0016] Figure 1 This is a front view of the magnetic pole piece of this utility model; Figure 2 This is a schematic diagram of the magnetic pole unit of this utility model from another angle; Figure 3 This is a schematic diagram of the oblique pole structure of this utility model.

[0017] Explanation of reference numerals in the attached drawings: 1-Magnetic pole lamination body, 11-First mounting part, 111-First mounting through hole, 12-Second mounting part, 121-Positioning boss, 122-Second mounting through hole, 123-Bolt through hole, 2-Rotor yoke, 21-Positioning groove. Detailed Implementation

[0018] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0019] Example 1: like Figure 1 and Figure 2 As shown, this utility model provides a magnetic pole lamination, which includes a magnetic pole lamination body 1. The magnetic pole lamination body 1 includes a first mounting part 11 and a second mounting part 12 fixedly connected. A plurality of first mounting through holes 111 for fixing permanent magnets are provided through the first mounting part 11 along the thickness direction. The plurality of first mounting through holes 111 are symmetrically distributed along the center line of the magnetic pole lamination body 1. The inner surface of the second mounting part 12 is adapted to the outer surface of the rotor yoke 2, and the inner surface of the second mounting part 12 is provided with a positioning boss 121 adapted to the positioning groove 21 on the outer surface of the rotor yoke 2. A plurality of second mounting through holes 122 adapted to fixing members are provided through the second mounting part 12 along the thickness direction. The center line X of the positioning boss 121 is eccentrically set relative to the center line Y of the magnetic pole lamination body 1. The plurality of second mounting through holes 122 are symmetrically distributed along the center line X of the positioning boss 121.

[0020] In actual use, the first mounting through holes 111 of the first mounting part 11 are symmetrically distributed along the center line Y of the magnetic pole lamination body 1, which can form a balanced fixing force on the permanent magnet, ensuring that the permanent magnet is not easily displaced or loosened due to vibration, centrifugal force, etc. when the motor is running. This symmetrical distribution fixing method can reduce the magnetic performance loss caused by uneven force on the permanent magnet, ensure the stability of the magnetic field distribution, and thus improve the electromagnetic performance of the motor.

[0021] The inner surface of the second mounting part 12 is adapted to the outer surface of the rotor yoke 2. With the fitting design of the positioning boss 121 and the positioning groove 21 of the rotor yoke 2, the magnetic pole lamination and the rotor yoke 2 can be accurately connected, avoiding positional deviation during assembly.

[0022] The center line X of the positioning boss 121 is eccentrically set relative to the center line Y of the magnetic pole lamination body 1. This core design provides the basis for the rotor skewed pole structure: through this eccentric setting, a preset angle offset can be formed during the assembly of the magnetic pole laminations. The arrangement of multiple magnetic pole laminations can achieve high-precision skewed poles. Several second mounting through holes 122 are symmetrically distributed along the center line X of the positioning boss 121. When they cooperate with the fixing parts, they can make the connection between the second mounting part 12 and the rotor yoke 2 uniformly stressed, avoiding structural deformation or loosening caused by local stress concentration.

[0023] The first mounting through hole 111 has widths of L1 and L2 on both sides relative to the center line Y of the magnetic pole piece body 1, and L1 and L2 are equal. The other two first mounting through holes 111 have widths of M1 and M2 on both sides relative to the center line Y of the magnetic pole piece body 1, and M1 and M2 are equal. The second mounting through hole 122 is symmetrically distributed along the center line X of the positioning boss 121. The mounting angles of the second mounting through hole 122 relative to the center line X of the positioning boss 121 are β1 and β2, and β1 and β2 are equal. The distances between the center line X of the positioning boss 121 and the two sides of the magnetic pole piece body 1 are N1 and N2, and N1 and N2 are not equal.

[0024] In a preferred embodiment of this invention, the inner surface of the second mounting part 12 is provided with a plurality of bolt through holes 123 corresponding to and communicating with the second mounting through hole 122, and the fastener is provided with threaded holes corresponding to the positions of the bolt through holes 123.

[0025] In actual use, the bolt through hole 123 is connected to the second mounting through hole 122. With the help of the threaded hole on the fastener, the second mounting part 12 and the fastener can be rigidly connected by bolts and other fasteners. Through precise multi-point matching, the magnetic pole lamination body 1 can be firmly fixed on the rotor yoke 2, avoiding loosening caused by vibration, centrifugal force, etc. during motor operation, and ensuring the stability of the overall structure.

[0026] In a preferred embodiment of this invention, the number of the first mounting through holes 111 is three, and the number of the second mounting through holes 122 is two.

[0027] In practical use, the three permanent magnets are symmetrically distributed along the center line of the magnetic pole piece body 1 through three first mounting through holes 111, forming a more balanced magnetic field distribution. Each permanent magnet is fixed through an independent first mounting through hole, forming a three-point distributed fixing structure, which effectively disperses the loads such as vibration and centrifugal force during motor operation, preventing a single permanent magnet from loosening or falling off due to concentrated force. In addition, the layout of the three permanent magnets can reduce the impact of damage to a single permanent magnet on the overall magnetic performance. Even if one permanent magnet experiences slight magnetic performance decay, the other two can still maintain a basic magnetic field output, improving the fault tolerance of motor operation.

[0028] Two second mounting through holes 122 are symmetrically distributed along the center line of the positioning boss 121, and can be used to securely connect the magnetic pole laminations to the rotor yoke 2 through fasteners. The symmetrical two-point connection ensures balanced force and prevents the magnetic pole lamination body 1 from tilting when the rotor rotates.

[0029] In a preferred embodiment of this invention, the positioning groove 21 extends axially along the outer surface of the rotor yoke 2.

[0030] In practical use, the positioning groove 21 extends axially, providing a continuous guide path for the positioning boss 121 of the magnetic pole lamination body 1. During assembly, the magnetic pole lamination can slide smoothly and precisely into place axially, reducing the difficulty of alignment during assembly. This ensures that the positioning boss 121 and the positioning groove 21 are fully engaged, avoiding installation deviations caused by local misalignment and improving the fitting accuracy between the magnetic pole lamination and the rotor yoke 2. The axially extending positioning groove 21 and the positioning boss 121 of the magnetic pole lamination form a long-term axial fit, which can disperse the radial and axial forces generated by the rotor rotation when the motor is running at high speed, avoiding component deformation or loosening caused by local stress concentration. At the same time, the continuous axial contact also makes the connection between the magnetic pole unit and the rotor yoke 2 more stable, improving the vibration resistance of the overall structure.

[0031] In a preferred embodiment of this invention, multiple positioning grooves 21 on the outer surface of the rotor yoke 2 are evenly distributed along the circumference of the rotor yoke 2.

[0032] In practical use, the positioning grooves 21 are evenly distributed along the circumference of the rotor yoke 2, providing a symmetrical and regular assembly reference for the positioning bosses 121 of the pole lamination body 1. This ensures that multiple pole units can be evenly arranged along the circumferential direction of the outer surface of the rotor yoke 2, thereby making the overall magnetic field distribution of the rotor more balanced, reducing electromagnetic force fluctuations caused by pole position deviations, and improving the stability of motor operation. The evenly distributed positioning grooves 21 can serve as standardized assembly positioning points, facilitating quick alignment of the pole lamination body 1 and the rotor yoke 2 during production, reducing assembly errors. At the same time, the uniform spacing design ensures that the installation position of each pole unit is consistent, guaranteeing the symmetry of the skewed pole structure without additional adjustments, improving production efficiency and assembly accuracy.

[0033] In a preferred embodiment of this invention, the outer surface of the first mounting part 11 is an arc-shaped surface with a radius smaller than the rotor diameter, and the inner surface is fixedly connected to the second mounting part 12.

[0034] In practical use, the outer surface of the first mounting part 11 is designed as an arc shape, which better fits the overall circular structure of the motor rotor, making the spatial fit between the magnetic pole lamination body 1 and other internal components of the motor more reasonable after assembly. This arc shape helps the permanent magnet to form a more uniform and regular magnetic field shape after installation, reducing magnetic field distortion, thereby improving the electromagnetic performance of the motor and reducing losses caused by uneven magnetic field distribution. At the same time, the design that the radius of the arc surface is smaller than the rotor diameter ensures that the magnetic pole lamination will not exceed the overall circular range of the rotor after assembly, avoiding radial interference with other components such as the motor stator, ensuring the safety of the rotor during high-speed rotation, and reducing wear or noise caused by structural collisions.

[0035] Example 2: like Figure 3 As shown, based on Embodiment 1, this embodiment provides a rotor skewed pole structure, which includes the magnetic pole laminations provided in Embodiment 1, as well as a rotor yoke 2 and a plurality of magnetic pole units connected to the outer surface of the rotor yoke 2. Each magnetic pole unit is made by stacking a plurality of magnetic pole lamination bodies 1, and the plurality of magnetic pole lamination bodies 1 are arranged alternately in opposite directions along the axial direction of the magnetic pole unit.

[0036] In practical applications, the alternating forward and reverse arrangement of the magnetic pole laminations 1 along the axial direction of the magnetic pole unit effectively reduces the motor's harmonic potential, cogging torque, and torque ripple, thereby reducing electromagnetic noise and vibration and improving the smoothness of motor operation. A single magnetic pole unit is made by stacking several magnetic pole laminations 1, eliminating the need for complex skewed slot machining or specialized tilting fixtures during production, thus simplifying the manufacturing process. It is suitable not only for small motors but also meets the requirements of large motors for skewed pole structures, exhibiting strong versatility and flexibility.

[0037] Taking a single magnetic pole unit as an example, a permanent magnet is fixed in the first mounting through hole of the magnetic pole lamination body 1. Then, the magnetic pole lamination body 1 with the fixed permanent magnet is embedded into the positioning groove 21 on the rotor yoke 2 through the magnetic pole positioning boss 121, realizing the radial positioning and installation of a single magnetic pole lamination body 1. It is then moved along the positioning groove 21 to the axial preset position of the rotor yoke 2. Next, the second magnetic pole lamination body 1 of the same magnetic pole unit is placed in the same manner. To achieve staggered poles, care must be taken during placement to ensure that the A-side of the second magnetic pole lamination body 1 is in contact with the A-side of the first magnetic pole lamination body 1, or that the B-side of the second magnetic pole lamination body 1 is in contact with the B-side of the first magnetic pole lamination body 1. The A-side is the front side of the magnetic pole lamination body 1, and the B-side is the back side of the magnetic pole lamination body 1. The other magnetic pole lamination bodies 1 of the same magnetic pole unit are then placed in the same manner. To achieve staggered pole orientation, during installation, ensure that the A-face orientation of the odd-order pole piece body 1 and the even-order pole piece body 1 are consistent. After all pole piece bodies 1 of this pole unit are installed, all second mounting through holes 122 will be perfectly aligned without misalignment. Simultaneously, all permanent magnets on each pole piece body 1 will be segmented and staggered, as shown below. Figure 2 As shown.

[0038] Example 3: Based on Embodiment 2, this embodiment provides a motor including the rotor skewed pole structure provided in Embodiment 2. In actual use, the motor, through the rotor skewed pole structure, can generate two axial forces in opposite directions and symmetrically, with a resultant force that is essentially zero. This effectively weakens the high-frequency additional radial electromagnetic force introduced by the frequency converter power supply, thereby reducing harmonic potential, cogging torque, and torque fluctuation, reducing electromagnetic noise and vibration, and significantly improving the smoothness and long-term reliability of the motor operation. This motor can achieve high-precision skewed poles without relying on special tooling: the magnetic pole lamination body 1 cooperates with the positioning groove 21 of the rotor yoke 2 through the positioning boss 121. The eccentric design of the positioning boss 121 achieves a precise skewed pole angle, simplifying the manufacturing process; at the same time, compared with the traditional skewed slot structure, it can reduce the amount of copper wire used in the coil, reducing material costs.

[0039] All technical features in this embodiment can be freely combined according to actual needs. The above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model. Technologies, shapes, and structural parts not described in detail in this utility model are all known technologies.

[0040] The above embodiments are preferred implementations of this utility model. In addition, other implementations are also included. Any obvious substitutions without departing from the concept of this technical solution are within the protection scope of this utility model.

Claims

1. A magnetic pole piece, comprising a magnetic pole piece body (1), characterized in that: The magnetic pole stamp body (1) includes a first mounting part (11) and a second mounting part (12) that are fixedly connected. A plurality of first mounting through holes (111) for fixing permanent magnets are provided through the thickness direction of the first mounting part (11). The plurality of first mounting through holes (111) are symmetrically distributed along the center line of the magnetic pole stamp body (1). The inner surface of the second mounting part (12) is adapted to the outer surface of the rotor yoke (2), and the inner surface of the second mounting part (12) is provided with a positioning boss (121) adapted to the positioning groove (21) on the outer surface of the rotor yoke (2), and a plurality of second mounting through holes (122) adapted to the fixing member are provided through the thickness direction of the second mounting part (12). The center line X of the positioning boss (121) is eccentrically set relative to the center line Y of the magnetic pole piece body (1), and a number of second mounting through holes (122) are symmetrically distributed along the center line X of the positioning boss (121).

2. The magnetic pole piece according to claim 1, characterized in that: The inner surface of the second mounting part (12) is provided with a plurality of bolt through holes (123) that correspond to and communicate with the second mounting through hole (122), and the fastener is provided with threaded holes corresponding to the positions of the bolt through holes (123).

3. The magnetic pole piece according to claim 1, characterized in that: The number of first mounting through holes (111) is three, and the number of second mounting through holes (122) is two.

4. The magnetic pole piece according to claim 1, characterized in that: The positioning groove (21) extends axially along the outer surface of the rotor yoke (2).

5. The magnetic pole piece according to claim 1, characterized in that: Multiple positioning grooves (21) on the outer surface of the rotor yoke (2) are evenly distributed along the circumference of the rotor yoke (2).

6. The magnetic pole piece according to claim 1, characterized in that: The outer surface of the first mounting part (11) is an arc-shaped surface with a radius smaller than the rotor diameter, and the inner surface is fixedly connected to the second mounting part (12).

7. A rotor skewed pole structure, characterized in that: It includes a rotor yoke (2) and a plurality of magnetic pole units connected to the outer surface of the rotor yoke (2). Each magnetic pole unit is made by stacking a plurality of magnetic pole lamination bodies (1) as described in any one of claims 1 to 6. The plurality of magnetic pole lamination bodies (1) are arranged alternately in opposite directions along the axial direction of the magnetic pole unit.

8. An electric motor, characterized in that: Includes the rotor skew pole structure as described in claim 7.

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