Motor rotor punching sheet structure and rotor

Abstract

The invention relates to the technical field of motor rotor punching sheets, in particular to a motor rotor punching sheet structure and a rotor, which comprises a rotor punching sheet, eight groups of first-layer V-shaped magnetic steel grooves are arranged on the rotor punching sheet in an annular array, and each first-layer V-shaped magnetic steel groove is composed of two linear groove bodies. The two ends of each group of first-layer V-shaped magnetic steel grooves are provided with first-layer magnetic steel groove air magnetic isolation grooves close to the outer diameter end of the rotor and first-layer magnetic steel groove air magnetic isolation grooves close to the inner diameter end of the rotor respectively, the bottom end of each group of first-layer V-shaped magnetic steel grooves is provided with first-layer magnetic steel groove magnetic bridges, and second-layer magnetic steel is placed in the second-layer V-shaped magnetic steel grooves. A plurality of V-shaped magnetic steel groove magnetic bridges are arranged on the outer side of the rotor punching sheet in an annular array mode, through the design of the double-layer V-shaped magnetic steel groove rotor punching sheet structure, a magnetic circuit is optimized, leakage magnetic flux is reduced, reluctance torque is increased, cogging torque is reduced, the torque and power density of the motor are improved, the leakage magnetic flux of each magnetic pole is weakened, and the main magnetic flux of the motor is enhanced.

Description

Technical Field

[0001] The invention relates to a rotor punching sheet structure, in particular to a motor rotor punching sheet structure, and belongs to the technical field of motor rotor punching sheets. Background Art

[0002] Motor rotor punchings are usually made of silicon steel sheets or other magnetic conductive materials and have specific shapes and sizes; their main structures include the rotor punching body and the slots and holes opened on it; these slots and holes are used to embed windings, install permanent magnets or realize other specific functions; the manufacturing process of motor rotor punchings usually includes punching, lamination, welding and other steps, and is widely used in electric motorcycle motor rotors.

[0003] However, the current motor rotor punchings directly open multiple magnetic steel slots on the punchings, which are simply radially distributed, and then the magnets are installed inside the magnetic steel slots. The magnetic steel slots are also a single-layer design, which makes it difficult to increase the direct-axis inductance of the motor and increase the magnetic resistance torque. It is not easy to increase the high-efficiency operating area of ​​the drive motor, and the motor speed range cannot be expanded. There is no leakage-proof magnetic isolation groove at the magnetic steel slot, and the leakage flux of each pole cannot be weakened, and the main magnetic flux of the motor cannot be enhanced. Summary of the invention

[0004] The purpose of the present invention is to provide a motor rotor punching structure and a rotor in order to solve the above-mentioned problems. Through the design of a double-layer V-shaped magnetic steel slot rotor punching structure, the magnetic circuit is optimized, the leakage flux is reduced, the magnetic resistance torque is increased, the cogging torque is reduced, the motor torque and power density are improved, the leakage flux of each pole is weakened, and the main magnetic flux of the motor is enhanced.

[0005] The present invention achieves the above-mentioned purpose through the following technical scheme, a motor rotor punching structure and a rotor, including a rotor punching, eight groups of first-layer V-shaped magnetic steel grooves are arranged in an annular array on the rotor punching, the first-layer V-shaped magnetic steel grooves are composed of two straight groove bodies, and the two straight groove bodies of each group of the first-layer V-shaped magnetic steel grooves are provided with first-layer V-shaped magnetic steel slots, and the two ends of each group of the first-layer V-shaped magnetic steel grooves are respectively provided with air magnetic isolation grooves at the outer diameter end of the rotor and air magnetic isolation grooves at the inner diameter end of the rotor, and the bottom end of each group of the first-layer V-shaped magnetic steel grooves is provided with a first-layer magnetic steel groove magnetic bridge, and eight groups of second-layer V-shaped magnetic steel grooves are arranged in an annular array on the rotor punching. The second layer of V-shaped magnetic steel slots is composed of two straight slot bodies, and the two straight slot bodies of each group of the second layer of V-shaped magnetic steel slots are provided with second layer of V-shaped magnetic steel slots. The two ends of each group of the second layer of V-shaped magnetic steel slots are respectively provided with air magnetic isolation slots at the outer diameter end of the rotor and the air magnetic isolation slots at the inner diameter end of the rotor. The bottom end of each group of the second layer of V-shaped magnetic steel slots is provided with a second layer of magnetic steel slot magnetic bridge, and the rotor punching is provided with pin holes and deweighting holes. The first layer of magnetic steel is placed inside the first layer of V-shaped magnetic steel slots, and the second layer of magnetic steel is placed inside the second layer of V-shaped magnetic steel slots. A plurality of V-shaped magnetic steel slot magnetic bridges are provided in a circular array outside the rotor punching.

[0006] Preferably, the first layer of V-shaped magnetic steel grooves is close to the outer side of the rotor punching sheet, and the second layer of V-shaped magnetic steel grooves is close to the inner side of the rotor punching sheet.

[0007] Preferably, the first layer of V-shaped magnetic steel grooves is located on the inner side of the second layer of V-shaped magnetic steel grooves, and the magnetic bridges of the first layer of magnetic steel grooves and the magnetic bridges of the second layer of magnetic steel grooves are located on the same straight line.

[0008] Preferably, two sides of the air magnetic isolation groove of the first layer of magnetic steel slots near the outer diameter end of the rotor are respectively provided with a first layer of magnetic steel slots air magnetic isolation groove shaping structure 1 near the outer diameter end of the rotor and a first layer of magnetic steel slots air magnetic isolation groove shaping structure 2 near the outer diameter end of the rotor.

[0009] Preferably, a first layer of magnetic steel slots and an air magnetic isolation groove shaping structure close to the inner diameter end of the rotor is provided at the bottom end of the air magnetic isolation groove of the first layer of magnetic steel slots close to the inner diameter end of the rotor.

[0010] Preferably, the second layer of magnetic steel slots are provided with a first air magnetic isolation groove shaping structure near the outer diameter end of the rotor and a second air magnetic isolation groove shaping structure near the outer diameter end of the rotor respectively on both sides of the air magnetic isolation groove near the outer diameter end of the rotor.

[0011] Preferably, the bottom end of the second layer of magnetic steel slots is close to the air magnetic isolation slot at the inner diameter end of the rotor, and the second layer of magnetic steel slots is close to the air magnetic isolation slot at the inner diameter end of the rotor.

[0012] Preferably, the deweighting holes are in a trapezoidal structure, and the deweighting holes and the pin holes are distributed in a circular array. A deweighting hole structure is designed between two adjacent poles, which functions to deweight the motor rotor and reduce the motor's rotational inertia.

[0013] The present invention also provides a motor rotor, which comprises a motor rotor punching sheet structure.

[0014] The beneficial effects of the present invention are:

[0015] 1. The design of double-layer magnetic steel slots, and each group of magnetic steel slots is V-shaped, which improves the direct axis inductance of the motor, increases the magnetic resistance torque, improves the high-efficiency operating area of ​​the drive motor, and expands the motor speed range.

[0016] 2. Multiple groups of magnetic steel slots with equal interval angles are formed on the rotor punching to simplify the embedding process of permanent magnets.

[0017] 3. Air magnetic isolation grooves are set at both ends of the magnetic steel to prevent magnetic leakage, weaken the leakage flux of each magnetic pole, enhance the main magnetic flux of the motor, and improve the power factor during the operation of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 It is a schematic diagram of the connection structure of the rotor punching, the first magnetic steel and the second magnetic steel of the present invention;

[0020] Figure 3 It is a schematic diagram of the connection structure of the rotor punching, the first layer of V-shaped magnetic steel slots and the second layer of V-shaped magnetic steel slots of the present invention;

[0021] Figure 4 It is a schematic diagram of the connection structure of the rotor punching, the first layer of magnetic steel slot magnetic bridge and the second layer of magnetic steel slot magnetic bridge of the present invention.

[0022] In the figure: 1. V-shaped magnetic steel slot magnetic bridge; 2. First layer V-shaped magnetic steel slot; 3. First layer V-shaped magnetic steel slot position; 4. First layer magnetic steel slot air magnetic isolation slot near the outer diameter end of the rotor; 41. First layer magnetic steel slot air magnetic isolation slot modification structure 1 near the outer diameter end of the rotor; 42. First layer magnetic steel slot air magnetic isolation slot modification structure 2 near the outer diameter end of the rotor; 5. First layer magnetic steel slot air magnetic isolation slot near the inner diameter end of the rotor; 51. First layer magnetic steel slot air magnetic isolation slot modification structure near the inner diameter end of the rotor; 6. First layer magnetic steel slot magnetic bridge; 7. Second layer V-shaped magnetic steel slot; 8. Second V-shaped magnetic steel slot; 9, the second magnetic steel slot is close to the air magnetic insulation slot at the outer diameter end of the rotor; 91, the second magnetic steel slot is close to the air magnetic insulation slot at the outer diameter end of the rotor. Modification structure one; 92, the second magnetic steel slot is close to the air magnetic insulation slot at the outer diameter end of the rotor. Modification structure two; 10, the second magnetic steel slot is close to the air magnetic insulation slot at the inner diameter end of the rotor; 1001, the second magnetic steel slot is close to the air magnetic insulation slot at the inner diameter end of the rotor. Modification structure; 11, the second magnetic steel slot magnetic bridge; 12, rotor punching; 13, the first layer of magnetic steel; 14, the second layer of magnetic steel; 15, pin hole; 16, deweighting hole. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] See also Figure 1-4As shown, the motor rotor punching structure and the rotor include a rotor punching 12, wherein the rotor punching 12 is provided with eight groups of first-layer V-shaped magnetic steel slots 2 in an annular array, the first-layer V-shaped magnetic steel slots 2 are composed of two straight groove bodies, and the two straight groove bodies of each group of the first-layer V-shaped magnetic steel slots 2 are provided with first-layer V-shaped magnetic steel slot positions 3, and the two ends of each group of the first-layer V-shaped magnetic steel slots 2 are respectively provided with first-layer magnetic steel slot air isolation grooves 4 near the rotor outer diameter end and first-layer magnetic steel slot air isolation grooves 5 near the rotor inner diameter end, and the bottom end of each group of the first-layer V-shaped magnetic steel slots 2 is provided with first-layer magnetic steel slot magnetic bridges 6, and the rotor punching 12 is provided with eight groups of second-layer V-shaped magnetic steel slots 7 in an annular array, and the second-layer V-shaped magnetic steel slots 7 is composed of two straight groove bodies, and the two straight groove bodies of each group of the second-layer V-shaped magnetic steel grooves 7 are provided with second-layer V-shaped magnetic steel grooves 8, and the two ends of each group of the second-layer V-shaped magnetic steel grooves 7 are respectively provided with second-layer magnetic steel groove air magnetic isolation grooves 9 near the outer diameter end of the rotor and second-layer magnetic steel groove air magnetic isolation grooves 10 near the inner diameter end of the rotor, and the bottom end of each group of the second-layer V-shaped magnetic steel grooves 7 is provided with a second-layer magnetic steel groove magnetic bridge 11, and the rotor punching 12 is provided with a pin hole 15 and a deweighting hole 16, the first-layer V-shaped magnetic steel groove 2 is placed inside the first-layer V-shaped magnetic steel groove 13, and the second-layer V-shaped magnetic steel groove 7 is placed inside the second-layer magnetic steel 14, and the outer annular array of the rotor punching 12 is provided with a plurality of V-shaped magnetic steel groove magnetic bridges 1.

[0025] As a technical optimization solution of the present invention, the first layer of V-shaped magnetic steel slots 2 is close to the outer side of the rotor punching 12, and the second layer of V-shaped magnetic steel slots 7 is close to the inner side of the rotor punching 12, which can play a role in adjusting the sinusoidal nature of the air gap.

[0026] As a technical optimization solution of the present invention, the first layer of V-shaped magnetic steel grooves 2 is located on the inner side of the second layer of V-shaped magnetic steel grooves 7, and the first layer of magnetic steel groove magnetic bridges 6 and the second layer of magnetic steel groove magnetic bridges 11 are located on the same straight line, which can increase the stability of the overall structure.

[0027] As a technical optimization scheme of the present invention, the two sides of the air magnetic isolation slot 4 of the first layer of magnetic steel slots near the outer diameter end of the rotor are respectively provided with a first layer of magnetic steel slot air magnetic isolation slot shaping structure 1 41 near the outer diameter end of the rotor and a first layer of magnetic steel slot air magnetic isolation slot shaping structure 2 42 near the outer diameter end of the rotor, so as to adjust the magnetic pole arc coefficient so that the magnetic pole air gap waveform is closer to the positive rotation; thereby reducing the torque fluctuation of the motor and improving the motor efficiency, and the bottom end of the air magnetic isolation slot 5 of the first layer of magnetic steel slots near the inner diameter end of the rotor is provided with a first layer of magnetic steel slot air magnetic isolation slot shaping structure 51 near the inner diameter end of the rotor.

[0028] As a technical optimization scheme of the present invention, the air magnetic isolation groove 9 of the second layer of magnetic steel slots near the outer diameter end of the rotor is provided with a second layer of magnetic steel slots near the outer diameter end of the rotor shaping structure 1 91 and a second layer of magnetic steel slots near the outer diameter end of the rotor shaping structure 2 92 respectively on both sides, the deweighting hole 16 is a trapezoidal structure, and the deweighting hole 16 and the pin hole 15 are distributed in a circular array, and the second layer of magnetic steel slots near the bottom of the air magnetic isolation groove 10 of the second layer of magnetic steel slots near the inner diameter end of the rotor is used to solve the problem of stress concentration when the motor is running at high speed, and the problem of local demagnetization of the magnetic steel near this position when the motor is running with weak magnetic field. Between the two adjacent poles, a deweighting hole structure is designed, and its function is to deweight the motor rotor and reduce the motor's rotational inertia. Between the two adjacent poles, a pin hole structure is designed, and its function is to stack the motor rotor punchings into one, to prevent the motor punchings from spreading, causing the motor NVH to deteriorate and the efficiency to decrease.

[0029] When the present invention is in use, eight groups of first-layer V-shaped magnetic steel slots 2 are arranged in a ring array on the rotor punching sheet 12. The first-layer V-shaped magnetic steel slots 2 are composed of two straight groove bodies. The first-layer V-shaped magnetic steel slots 3 are arranged at the two straight groove bodies of each group of first-layer V-shaped magnetic steel slots 2, which can improve the direct axis inductance of the motor, increase the magnetic resistance torque, improve the high-efficiency operation area of ​​the drive motor, expand the motor speed range to achieve the installation of the first-layer magnetic steel 13, and the first-layer magnetic steel slot air isolation groove 4 near the rotor outer diameter end and the first-layer magnetic steel slot air isolation groove 5 near the rotor inner diameter end are respectively opened at both ends of each group of first-layer V-shaped magnetic steel slots 2, so as to weaken each The leakage flux of the magnetic pole is enhanced, the main magnetic flux of the motor is enhanced, and the power factor of the motor is improved during operation. The bottom end of each group of first-layer V-shaped magnetic steel slots 2 is provided with a first-layer magnetic steel slot magnetic bridge 6 to support the two first-layer V-shaped magnetic steel slots 2, and multiple groups of straight-line slots with equal intervals are formed on the rotor punching 12, which simplifies the embedding process of the permanent magnet and facilitates the installation of the first-layer magnetic steel 13; eight groups of second-layer V-shaped magnetic steel slots 7 are arranged in an annular array on the rotor punching 12, and the second-layer V-shaped magnetic steel slots 7 are composed of two straight-line slots. The two straight-line slots of each group of second-layer V-shaped magnetic steel slots 7 are provided with second-layer V-shaped magnetic steel slots 8, and each group of second The two ends of the V-shaped magnetic steel slot 7 are respectively provided with the air magnetic isolation slot 9 of the second magnetic steel slot near the outer diameter end of the rotor and the air magnetic isolation slot 10 of the first magnetic steel slot near the inner diameter end of the rotor. The bottom end of each group of the second V-shaped magnetic steel slot 7 is provided with a second magnetic steel slot magnetic bridge 11. Similarly, the first layer of V-shaped magnetic steel slots 2 are further optimized. Two groups of double-layer straight-line magnetic steel slots form a pole. Two layers of V-shaped magnetic steel are arranged on each pole, which improves the direct axis inductance of the motor, increases the magnetic resistance torque, improves the high-efficiency operation area of ​​the drive motor, and expands the motor speed range. Anti-leakage magnetic air isolation slots are set at both ends of the permanent magnet to weaken the leakage flux of each magnetic pole and enhance the electric The main magnetic flux of the machine can improve the power factor during the operation of the motor; the rotor punching sheet 12 is provided with a pin hole 15 and a deweighting hole 16, the first layer of V-shaped magnetic steel slot 2 is placed inside the first layer of magnetic steel 13, and the second layer of V-shaped magnetic steel slot 7 is placed inside the second layer of magnetic steel 14. The outer annular array of the rotor punching sheet 12 is provided with a plurality of V-shaped magnetic steel slot magnetic bridges 1 for generating the motor reluctance torque, which can increase the motor output torque. Each group of double-layer V-shaped permanent magnets is close to the air magnetic isolation slot of the outer diameter. Through cultivation, the magnetic flux of the magnetic pole air gap is closer to the sine, which effectively reduces the motor slot torque and the motor torque fluctuation, and reduces the motor no-load loss and the motor load NVH.

[0030] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0031] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A motor rotor punching structure, comprising a rotor punching (12), characterized in that: The rotor punching sheet (12) is provided with eight groups of first-layer V-shaped magnetic steel slots (2) in an annular array, the first-layer V-shaped magnetic steel slots (2) are composed of two straight groove bodies, and the two straight groove bodies of each group of the first-layer V-shaped magnetic steel slots (2) are provided with first-layer V-shaped magnetic steel slot positions (3), and the two ends of each group of the first-layer V-shaped magnetic steel slots (2) are respectively provided with first-layer magnetic steel slot air magnetic isolation slots (4) close to the rotor outer diameter end and first-layer magnetic steel slot air magnetic isolation slots (5) close to the rotor inner diameter end, and the bottom end of each group of the first-layer V-shaped magnetic steel slots (2) is provided with first-layer magnetic steel slot magnetic bridges (6), and the rotor punching sheet (12) is provided with eight groups of second-layer V-shaped magnetic steel slots (7) in an annular array, the second-layer V-shaped magnetic steel slots (7) are composed of two straight groove bodies, and each group of The second layer V-shaped magnetic steel slots (7) are provided with second layer V-shaped magnetic steel slot positions (8) at the two straight groove bodies, and each group of the second layer V-shaped magnetic steel slots (7) are provided with second layer magnetic steel slot air magnetic isolation grooves (9) at the rotor outer diameter end and second layer magnetic steel slot air magnetic isolation grooves (10) at the rotor inner diameter end respectively at both ends, and each group of the second layer V-shaped magnetic steel slots (7) is provided with second layer magnetic steel slot magnetic bridges (11) at the bottom end, and the rotor punching (12) is provided with pin holes (15) and deweighting holes (16), the first layer V-shaped magnetic steel slots (2) are provided with first layer magnetic steel (13), and the second layer V-shaped magnetic steel slots (7) are provided with second layer magnetic steel (14), and a plurality of V-shaped magnetic steel slot magnetic bridges (1) are provided in a circular array outside the rotor punching (12).

2. The motor rotor punching structure according to claim 1, characterized in that: The first layer of V-shaped magnetic steel slots (2) are close to the outer side of the rotor punching sheet (12), and the second layer of V-shaped magnetic steel slots (7) are close to the inner side of the rotor punching sheet (12).

3. The motor rotor punching structure according to claim 1, characterized in that: The first layer of V-shaped magnetic steel grooves (2) are located inside the second layer of V-shaped magnetic steel grooves (7), and the first layer of magnetic steel groove magnetic bridges (6) and the second layer of magnetic steel groove magnetic bridges (11) are located on the same straight line.

4. The motor rotor punching structure according to claim 1, characterized in that: The first layer of magnetic steel slots and the air magnetic isolation slots (4) are provided with a first layer of magnetic steel slots and the air magnetic isolation slots (41) and a first layer of magnetic steel slots and the air magnetic isolation slots (42) on both sides of the first layer of magnetic steel slots and the air magnetic isolation slots (4) on the rotor outer diameter end.

5. The motor rotor punching structure according to claim 1, characterized in that: The bottom end of the first layer of magnetic steel slots and the air magnetic isolation slots (5) close to the inner diameter end of the rotor is provided with a first layer of magnetic steel slots and the air magnetic isolation slots shaping structure (51) close to the inner diameter end of the rotor.

6. The motor rotor punching structure according to claim 1, characterized in that: The second layer of magnetic steel slots are provided with a first air magnetic isolation slot shaping structure (91) near the outer diameter end of the rotor and a second air magnetic isolation slot shaping structure (92) near the outer diameter end of the rotor, respectively, on both sides of the second layer of magnetic steel slots near the outer diameter end of the rotor.

7. The motor rotor punching structure according to claim 1, characterized in that: The bottom end of the second layer of magnetic steel slots close to the air magnetic isolation slots (10) at the inner diameter end of the rotor is a second layer of magnetic steel slots close to the air magnetic isolation slots at the inner diameter end of the rotor.

8. The motor rotor punching structure according to claim 1, characterized in that: The de-weighting holes (16) are in a trapezoidal structure, and the de-weighting holes (16) and the pin holes (15) are both distributed in a circular array.

9. A motor rotor, characterized in that: The motor rotor comprises a motor rotor punching structure as claimed in any one of claims 1 to 8.

Images