Motor rotor punching sheet structure
By designing V-shaped magnet slots and narrow magnet slot bridge structures on the motor rotor laminations, the problems of motor output torque and speed are solved, achieving an increase in motor output torque and speed, while reducing magnet leakage and motor torque fluctuations, thus improving motor efficiency and stability.
Patent Information
- Application Number
- CN202520440617.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-13
- Publication Date
- 2026-02-10
- Estimated Expiration
- 2035-03-13
AI Technical Summary
The existing design of the magnet slots in the rotor laminations of motors cannot increase the output torque of the motor, and the magnetic bridge width between adjacent magnets is relatively large, resulting in low motor speed.
Multiple sets of V-shaped magnet slots are arranged in a ring on the rotor lamination. Each set consists of two slots with a straight structure. A narrow magnet bridge is provided between the V-shaped magnet slots, and magnets are placed in the slots. Annular pin holes and weight-removing holes are designed to enhance structural stability.
It increases the motor output torque, improves the motor speed, and reduces magnet leakage and motor torque fluctuation, thereby improving motor efficiency and stability.
Smart Images
Figure CN223899028U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a rotor lamination structure, specifically a motor rotor lamination structure, and belongs to the field of motor rotor lamination technology. Background Technology
[0002] Motor rotor laminations are thin metal sheets made of highly conductive materials (such as copper, aluminum, iron, silicon steel, etc.) through stacking. They are usually installed at the connection parts of the motor rotor and have the functions of conducting current and bearing electromagnetic force. They are the core components for improving motor efficiency. Motor rotor laminations can be divided into circular laminations, sector laminations, magnetic pole laminations, etc., depending on their shape. They can be used in the rotors of permanent magnet synchronous motors for electric motorcycles.
[0003] However, the magnet slots in current motor laminations are usually arranged in a single-line array around the circumference of the motor shaft, with magnets installed inside the slots. Magnets installed in this way cannot increase the output torque of the motor; moreover, the magnetic bridge between two adjacent magnets is relatively wide, forming a fan-shaped structure, which does not increase the motor speed. Utility Model Content
[0004] The purpose of this utility model is to provide a motor rotor lamination structure to solve the above problems. Multiple sets of magnet slots are arranged in a ring on the lamination for installing magnets, which increases the output torque of the motor and makes the motor rotate more stably. A narrower magnet bridge is provided between each set of V-shaped magnet slots to facilitate the increase of motor speed.
[0005] This utility model achieves the above-mentioned objective through the following technical solution: a motor rotor lamination structure, including rotor laminations, wherein multiple sets of V-shaped magnetic steel slots are arranged in a ring array on the rotor laminations, and each set of V-shaped magnetic steel slots is composed of two slots with a straight structure. A V-shaped magnetic steel slot magnetic bridge located on the outside of the rotor lamination is provided between the two V-shaped magnetic steel slots, and each V-shaped magnetic steel slot has a V-shaped magnetic steel slot position, which is connected to the V-shaped magnetic steel slot. A magnet located inside the straight structure slot is placed inside each set of V-shaped magnetic steel slots, and a magnetic steel slot magnetic bridge located between the two straight slots is provided on each level of V-shaped magnetic steel slots.
[0006] Preferably, the V-shaped magnetic steel groove is provided in eight sets, and the width of the V-shaped magnetic steel groove magnetic bridge between two adjacent V-shaped magnetic steel grooves is greater than the width of the straight groove.
[0007] Preferably, the two straight grooves on each set of V-shaped magnetic steel grooves are symmetrically arranged about the magnetic bridge of the magnetic steel groove, and the length of the magnetic bridge of the magnetic steel groove is equal to the width of the straight groove.
[0008] Preferably, each of the I-shaped slots in each group is provided with an air magnetic isolation slot near the outer diameter end of the rotor, and the width of the air magnetic isolation slot near the outer diameter end of the rotor is smaller than the width of the I-shaped slot.
[0009] Preferably, the rotor lamination is provided with multiple sets of shaping groove 1 and shaping groove 2 that are connected to the straight groove body, and the curvature of shaping groove 1 and shaping groove 2 is smaller than the curvature of the air magnetic isolation groove near the outer diameter end of the rotor.
[0010] Preferably, each of the I-shaped slots in each group has an air-insulating magnetic groove on the inner side of the rotor's inner diameter end, and the rotor lamination has a shaping groove three. The air-insulating magnetic groove on the inner diameter end of the rotor is connected to the shaping groove three, and the curvature of the shaping groove three is smaller than the curvature of the air-insulating magnetic groove on the inner diameter end of the rotor.
[0011] Preferably, the rotor lamination has circular pin holes, and the pin holes are distributed in a ring array on the rotor lamination, with multiple pin holes located between two adjacent V-shaped magnet slots.
[0012] Preferably, the rotor lamination has multiple de-weighting holes arranged in a ring array, and the multiple de-weighting holes are located between two adjacent V-shaped magnet slots.
[0013] The beneficial effects of this utility model are as follows: a set of V-shaped magnetic slots are set on the rotor lamination, each set consisting of two slots with a straight-line structure, and the two slots form an outward-opening V-shaped structure. A V-shaped magnetic bridge with a width greater than that of the straight-line slot is set between two adjacent V-shaped magnetic slots to generate motor reluctance torque, which can increase the motor output torque; a magnetic bridge is set between the two straight-line slots in each set, and the function of the magnetic bridge is to increase the motor speed. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0015] Figure 2 This is a schematic diagram of the connection structure of the rotor lamination, the air-insulating magnetic groove near the outer diameter end of the rotor, and the magnet of this utility model.
[0016] Figure 3 This is a schematic diagram of the rotor lamination, V-shaped magnet slot, and connection structure of the V-shaped magnet slot of this utility model.
[0017] In the diagram: 1. V-shaped magnet slot magnetic bridge; 2. V-shaped magnet slot; 3. V-shaped magnet slot position; 4. Air-insulated magnetic slot near the outer diameter end of the rotor; 41. Shaping slot one; 42. Shaping slot two; 5. Air-insulated magnetic slot near the inner diameter end of the rotor; 51. Shaping slot three; 6. Magnet slot magnetic bridge; 7. Rotor lamination; 8. Magnet; 9. Pin hole; 9A. Weight removal hole. Detailed Implementation
[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0019] Please see Figure 1-3 As shown, the motor rotor lamination structure includes a rotor lamination 7. The rotor lamination 7 has multiple sets of V-shaped magnetic slots 2 arranged in a ring array, and each set of V-shaped magnetic slots 2 is composed of two slots with a straight structure. A V-shaped magnetic slot bridge 1 located on the outside of the rotor lamination 7 is provided between the two V-shaped magnetic slots 2. Each V-shaped magnetic slot 2 has a V-shaped magnetic slot position 3, and the V-shaped magnetic slot position 3 is connected to the V-shaped magnetic slot 2. A magnet 8 located inside the straight structure slot is placed inside each set of V-shaped magnetic slots 2. A magnetic slot bridge 6 located between two slots is provided on each level of V-shaped magnetic slot 2.
[0020] As a technical optimization of this utility model, the V-shaped magnetic steel groove 2 is provided with eight sets, and the width of the V-shaped magnetic steel groove magnetic bridge 1 between two adjacent V-shaped magnetic steel grooves 2 is greater than the width of the straight groove body, which is used to generate motor magnetic reluctance torque.
[0021] As a technical optimization of this utility model, the two straight grooves on each set of V-shaped magnetic steel grooves 2 are symmetrically arranged about the magnetic steel groove bridge 6, and the length of the magnetic steel groove bridge 6 is equal to the width of the straight groove. The function of the magnetic steel groove bridge 6 is to increase the motor speed.
[0022] As a technical optimization of this utility model, each of the I-shaped slots in each group is provided with an air magnetic isolation slot 4 near the outer diameter end of the rotor, and the width of the air magnetic isolation slot 4 near the outer diameter end of the rotor is smaller than the width of the I-shaped slot, which is to reduce the magnetic leakage of the magnet 8.
[0023] As a technical optimization of this utility model, the rotor lamination 7 is provided with multiple sets of shaping groove 1 41 and shaping groove 2 42 that are connected to the straight groove body. The curvature of the shaping groove 1 41 and shaping groove 2 42 is smaller than the curvature of the air magnetic isolation groove 4 near the outer diameter end of the rotor. The function is to adjust the magnetic pole curvature coefficient, so that the magnetic pole air gap waveform is closer to the positive rotation, thereby reducing the motor torque fluctuation and improving the motor efficiency.
[0024] As a technical optimization of this utility model, each of the I-shaped slots in each group is provided with an air-insulating magnetic groove 5 near the inner diameter end of the rotor, and the rotor lamination 7 is provided with a shaping groove 3 51. The air-insulating magnetic groove 5 near the inner diameter end of the rotor is connected to the shaping groove 3 51. The curvature of the shaping groove 3 51 is smaller than that of the air-insulating magnetic groove 5 near the inner diameter end of the rotor. The function is to reduce magnetic leakage of the magnet, and at the same time solve the problem of stress concentration when the motor is running at high speed, as well as the problem of local demagnetization of the magnet 8 near this position when the motor is running with weak magnetic field.
[0025] As a technical optimization of this utility model, the rotor lamination 7 is provided with a circular pin hole 9, and the pin holes 9 are distributed in a ring array on the rotor lamination 7. The multiple pin holes 9 are located between two adjacent V-shaped magnet slots 2. Their function is to stack the rotor lamination 7 into one piece, prevent the rotor lamination 7 from falling apart, and cause the motor NVH to deteriorate and the efficiency to decrease.
[0026] As a technical optimization of this utility model, multiple de-weighting holes 9A are formed in a ring array on the rotor lamination 7, and the multiple de-weighting holes 9A are located between two adjacent V-shaped magnet slots 2. Their function is to de-weight the motor rotor and reduce the motor's rotational inertia.
[0027] In use, this invention features a set of V-shaped magnetic slots 2 on the rotor lamination 7. Each set consists of two slots with a straight-line structure, forming an outward-opening V-shape between them. A V-shaped magnetic bridge 1, wider than the straight-line slot, is placed between adjacent V-shaped magnetic slots 2 to generate reluctance torque, thereby increasing the motor's output torque. A magnetic bridge 6 is placed between the two straight-line slots in each set to increase the motor speed. The two straight-line slots in each set are symmetrical about the center line of the magnetic bridge 6. Each straight-line slot in each set has an air-insulating slot 4 near the rotor's outer diameter end, designed to reduce magnetic leakage. The width of the air-insulating slot 4 near the rotor's outer diameter end is smaller than the width of the V-shaped magnetic slot 2. A first shaping slot 41 and a second shaping slot 42 are placed on the air-insulating slot 4 near the rotor's outer diameter end to adjust the magnetic pole arc coefficient and make the magnetic pole air gap waveform closer to positive. The system rotates to reduce motor torque fluctuations and improve motor efficiency. Then, a straight magnet 8 is placed on each straight slot in each group. A V-shaped magnet slot 3 is provided on the V-shaped magnet slot 2. The positioning structure edges are all rounded arcs, designed to solve the stress concentration problem during high-speed motor operation. An air-insulating slot 5 is provided on the inner side of each straight slot in each group, near the rotor's inner diameter, to reduce magnet leakage from the magnet 8. A shaping slot 3 51 is provided on the air-insulating slot 5 near the rotor's inner diameter, designed to solve the stress concentration problem during high-speed motor operation and the local demagnetization problem of the magnet 8 near this location during weak magnetic operation. Multiple de-weighting holes 9A are opened in a ring structure between adjacent poles to de-weight the motor rotor and reduce the motor's rotational inertia. Multiple pin holes 9 are opened in a ring array between adjacent poles to stack the motor rotor laminations 7 into a single unit, preventing the rotor laminations 7 from scattering, which would worsen the motor's NVH and reduce efficiency.
[0028] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.
[0029] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. A motor rotor lamination structure, comprising rotor laminations (7), characterized in that: The rotor lamination (7) is provided with multiple sets of V-shaped magnetic slots (2) in a ring array. Each set of V-shaped magnetic slots (2) is composed of two slots with a straight structure. A V-shaped magnetic slot bridge (1) is provided between the two V-shaped magnetic slots (2) located outside the rotor lamination (7). Each V-shaped magnetic slot (2) is provided with a V-shaped magnetic slot position (3), and the V-shaped magnetic slot position (3) is connected to the V-shaped magnetic slot (2). A magnet (8) located inside the straight structure slot is placed inside each set of V-shaped magnetic slots (2). A magnetic slot bridge (6) located between two straight slots is provided on each level of V-shaped magnetic slots (2).
2. The motor rotor lamination structure according to claim 1, characterized in that: The V-shaped magnetic steel groove (2) is provided in eight sets, and the width of the V-shaped magnetic steel groove magnetic bridge (1) between two adjacent V-shaped magnetic steel grooves (2) is greater than the width of the straight groove.
3. The motor rotor lamination structure according to claim 1, characterized in that: The two straight grooves on each set of V-shaped magnetic steel grooves (2) are symmetrically arranged about the magnetic bridge (6) of the magnetic steel groove, and the length of the magnetic bridge (6) of the magnetic steel groove is equal to the width of the straight groove.
4. The motor rotor lamination structure according to claim 1, characterized in that: Each of the I-shaped slots in each group is provided with an air magnetic isolation slot (4) on the outer side of the rotor outer diameter end, and the width of the air magnetic isolation slot (4) on the outer diameter end of the rotor is smaller than the width of the I-shaped slot.
5. The motor rotor lamination structure according to claim 4, characterized in that: The rotor lamination (7) is provided with multiple sets of shaping groove one (41) and shaping groove two (42) that are connected to the straight groove body, and the curvature of the shaping groove one (41) and shaping groove two (42) is smaller than the curvature of the air magnetic isolation groove (4) near the outer diameter end of the rotor.
6. The motor rotor lamination structure according to claim 1, characterized in that: Each of the groups has an air-insulating magnetic groove (5) on the inner side of each I-shaped groove, and a shaping groove three (51) is provided on the rotor lamination (7). The air-insulating magnetic groove (5) on the inner diameter of the rotor is connected to the shaping groove three (51). The curvature of the shaping groove three (51) is smaller than that of the air-insulating magnetic groove (5) on the inner diameter of the rotor.
7. The motor rotor lamination structure according to claim 1, characterized in that: The rotor lamination (7) is provided with a circular pin hole (9), and the pin holes (9) are arranged in a ring array on the rotor lamination (7), and multiple pin holes (9) are located between two adjacent V-shaped magnet slots (2).
8. The motor rotor lamination structure according to claim 1, characterized in that: The rotor lamination (7) has multiple de-weighting holes (9A) arranged in a ring array, and the multiple de-weighting holes (9A) are located between two adjacent V-shaped magnet slots (2).