Motor rotor assembly unit and motor rotor using hybrid permanent magnet material

Abstract

The present invention provides a motor rotor assembly unit and a motor rotor using hybrid permanent magnet materials. The rotor is provided with a double-layer U-shaped magnetic steel slot, which includes a first U-shaped magnetic steel slot and a second U-shaped magnetic steel slot. The first U-shaped magnetic steel slot is close to the outer curved surface of the rotor, and the second U-shaped magnetic steel slot forms a wrapping structure with the first U-shaped magnetic steel slot. The specific magnetic steel slot size, position arrangement, rotor outer circle shape and the use of effective hybrid permanent magnet materials successfully solve the problem of low efficiency of ordinary rare earth permanent magnet motors under high-speed NEDC conditions. On the basis of ensuring the mechanical strength of the rotor core, the motor can normally output the required torque and power. The torque pulsation of the motor is low under the full speed range, which improves the controllability of the motor. By designing the rotor outer surface shape, magnetic steel slot shape, rotor outer circle shape and the number of layers, the motor back electromotive force harmonics are effectively improved and the cogging torque of the motor is reduced.

Description

Technical Field

[0001] The present invention relates to the field of rotor structures, and in particular to a motor rotor assembly unit and a motor rotor using mixed permanent magnet materials. Background Art

[0002] After more than half a century of intensive mining, China's rare earth reserves and guaranteed lifespan have steadily declined. Resources in major mining areas are declining rapidly, and most existing mines are depleted. Reducing rare earth use is urgent. Currently, the most commonly used rotor structures for internal rare earth permanent magnet synchronous motors (I-type, V-type, U-type, and W-type) include slotted structures. U-shaped slotted motors are a popular design in China due to their high magnetic concentration and wide speed range. However, traditional U-shaped slotted rotors with rare earth magnets have drawbacks such as high magnet cost and low efficiency under high-speed NEDC conditions. To ensure consistent motor performance while reducing magnet cost, lowering high-frequency iron loss, and improving NEDC efficiency, low-cost magnetic materials such as ferrites are being developed and mixed with rare earth permanent magnets for excitation. This patent proposes a novel motor rotor structure: a U-shaped, double-layer internal permanent magnet synchronous motor rotor. Based on this structure, mixed excitation using rare earth and ferrite materials is employed. This technology is of great significance for advancing the technology of new energy vehicle motors in my country and holds broad market potential.

[0003] Patent document CN102570663A discloses a hybrid rotor for a rotating electric machine. The rotor comprises a rotating shaft and a laminated core. The laminated core is provided with a plurality of first permanent magnet poles that rotate along the axis of the rotating shaft and are magnetized circumferentially relative to the axis. The laminated core is also provided with a plurality of second permanent magnet poles that rotate along the axis of the rotating shaft and are magnetized radially or circumferentially relative to the axis. The number of second permanent magnet poles is the same as the number of first permanent magnet poles. The magnetic force of the first permanent magnet poles is stronger than that of the second permanent magnet poles. Adjacent first permanent magnet poles have opposite polarity, and adjacent second permanent magnet poles have opposite polarity, and the first and second permanent magnet poles have the same polarity when facing each other. The second permanent magnet poles are embedded in the inner or outer layer of the laminated core via second permanent magnet slots. This patent still leaves room for improvement in the use of hybrid permanent magnet materials to further improve the structure of the electric machine rotor. Summary of the Invention

[0004] In view of the defects in the prior art, the purpose of the present invention is to provide a motor rotor assembly unit and a motor rotor using hybrid permanent magnet materials.

[0005] According to the present invention, a motor rotor assembly unit using a hybrid permanent magnet material includes: a first rotor outer diameter circle 29, a second rotor outer diameter eccentric circle 30, a first magnetic steel slot 3, a second magnetic steel slot 8, a third magnetic steel slot 13, a fourth magnetic steel slot 17, a fifth magnetic steel slot 21, a sixth magnetic steel slot 26, a first magnetic isolation bridge 2 at the rotor outer diameter, a second magnetic isolation bridge 6 at the rotor outer diameter, a third magnetic isolation bridge 16 at the rotor outer diameter, a fourth magnetic isolation bridge 20 at the rotor outer diameter, a first intermediate magnetic isolation bridge 31, and a second intermediate magnetic isolation bridge 32;

[0006] The first rotor outer diameter circle 29, the second rotor outer diameter eccentric circle 30, the first magnetic steel slot 3, the second magnetic steel slot 8, the third magnetic steel slot 13, the fourth magnetic steel slot 17, the fifth magnetic steel slot 21, the sixth magnetic steel slot 26, the first magnetic isolation bridge 2 at the rotor outer diameter, the second magnetic isolation bridge 6 at the rotor outer diameter, the third magnetic isolation bridge 16 at the rotor outer diameter, the fourth magnetic isolation bridge 20 at the rotor outer diameter, the first magnetic isolation bridge 31 in the middle, and the second magnetic isolation bridge 32 in the middle are arranged on the rotor silicon steel 28.

[0007] The rotor further comprises: a first rare earth material magnetic steel 9, a second rare earth material magnetic steel 15, a third rare earth material magnetic steel 24, a first ferrite material magnetic steel 4, a second ferrite material magnetic steel 19, a third ferrite material magnetic steel 11, a rotor silicon steel 28, a first clip 1 at the first magnetic steel slot, a second clip 5 at the first magnetic steel slot, a first clip 7 at the second magnetic steel slot, a second clip 10 at the second magnetic steel slot, a first clip 36 at the third magnetic steel slot, a second clip 37 at the third magnetic steel slot, a first clip 33 at the fourth magnetic steel slot, a second clip 14 at the fourth magnetic steel slot, a first clip 22 at the fifth magnetic steel slot, a second clip 18 at the fifth magnetic steel slot, a first clip 23 at the sixth magnetic steel slot, and a second clip 25 at the sixth magnetic steel slot;

[0008] The first rare earth material magnet 9, the second rare earth material magnet 15, the third rare earth material magnet 24, the first ferrite material magnet 4, the second ferrite material magnet 19, the third ferrite material magnet 11, the rotor silicon steel 28, the first clip 1 at the first magnetic steel slot, the second clip 5 at the first magnetic steel slot, the first clip 7 at the second magnetic steel slot, the second clip 10 at the second magnetic steel slot, the first clip 36 at the third magnetic steel slot, the second clip 37 at the third magnetic steel slot, the first clip 33 at the fourth magnetic steel slot, the second clip 14 at the fourth magnetic steel slot, the first clip 22 at the fifth magnetic steel slot, the second clip 18 at the fifth magnetic steel slot, the first clip 23 at the sixth magnetic steel slot, and the second clip 25 at the sixth magnetic steel slot are arranged on the rotor silicon steel 28.

[0009] Preferably, it further comprises: a first rivet hole 12, a second rivet hole 38, and a third rivet hole 27;

[0010] The first rivet hole 12 , the second rivet hole 38 , and the third rivet hole 27 are disposed on the rotor silicon steel 28 .

[0011] Preferably, the first ferrite material magnet 4 is embedded in the first magnet groove 3 and connected to the first clip 1 at the first magnet groove and the second clip 5 at the first magnet groove; the clip plays a role in positioning and fixing the first ferrite material magnet 4.

[0012] Preferably, the first rare earth material magnet 9 is embedded in the second magnet groove 8 and connected to the first clip 7 at the second magnet groove and the second clip 10 at the second magnet groove. The clips play a role in positioning and fixing the first rare earth material magnet 9.

[0013] Preferably, the second ferrite material magnet 19 is embedded in the fifth magnetic steel slot 21 and connected to the first clip 22 at the fifth magnetic steel slot and the second clip 18 at the fifth magnetic steel slot. The clip plays a role in positioning and fixing the second ferrite material magnet 19.

[0014] Preferably, the second rare earth material magnet 15 is embedded in the fourth magnetic steel slot 17 and connected to the first clip 33 at the fourth magnetic steel slot and the second clip 14 at the fourth magnetic steel slot. The clips play a role in positioning and fixing the second rare earth material magnet 15.

[0015] Preferably, the third ferrite material magnet 11 is embedded in the third magnet groove 13 and connected to the first clip 36 at the third magnet groove and the second clip 37 at the third magnet groove. The clips play a role in positioning and fixing the third ferrite material magnet 11.

[0016] Preferably, the third rare earth material magnet 24 is embedded in the sixth magnetic steel slot 26 and connected to the first clip 23 at the sixth magnetic steel slot and the second clip 25 at the sixth magnetic steel slot. The clips play a role in positioning and fixing the third rare earth material magnet 24.

[0017] According to the present invention, a motor rotor is provided, comprising: a motor rotor assembly unit using a hybrid permanent magnetic material; the number of the motor rotor assembly units using the hybrid permanent magnetic material is multiple; and the multiple motor rotor assembly units using the hybrid permanent magnetic material are arranged sequentially along the circumferential direction.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The present invention compensates for the performance degradation caused by the reduction in the amount of rare earth permanent magnet material magnet steel by increasing the amount of ferrite material magnet steel used;

[0020] 2. The present invention significantly reduces the overall magnetic steel cost of the motor while ensuring motor performance, and improves the efficiency of the motor under NEDC high-speed conditions;

[0021] 3. In this invention, the internal magnetic steel slot structure utilizes a combination of rare earth magnets and ferrite magnets, thereby improving torque output capacity. Furthermore, the rotor outer diameter design and the shape, size, and location of the magnetic steel slots reduce the motor's air gap magnetic flux harmonics, maintaining excellent low-torque ripple characteristics across the entire speed range and improving the motor's controllability. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Other features, objects and advantages of the present invention will become more apparent upon reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0023] Figure 1 It is a schematic diagram of the three-dimensional overall structure of the invention.

[0024] Figure 2 This is a schematic diagram of the slot shape of the first layer of magnetic steel slots close to the outer circle of the rotor.

[0025] Figure 3 This is a schematic diagram of the groove shape of the second layer of magnetic steel slots close to the outer circle of the rotor.

[0026] Figure 4 This is a schematic diagram of the one-eighth rotor structure of the invention patent.

[0027] Figure 5 This is a schematic diagram of the structural parameters of the one-eighth rotor size of the invention patent.

[0028] In the picture:

[0029] First buckle 1 at first magnetic steel slot Fourth magnetic steel slot 17

[0030] The first magnetic isolation bridge 2 at the outer diameter of the rotor The second clip 18 at the fifth magnetic steel slot

[0031] First magnetic steel slot 3 Second ferrite material magnetic steel 19

[0032] The first ferrite material magnet 4 The fourth magnetic isolation bridge 20 at the outer diameter of the rotor

[0033] Second buckle 5 at first magnetic steel slot Fifth magnetic steel slot 21

[0034] The second magnetic isolation bridge 6 at the outer diameter of the rotor The first clip 22 at the fifth magnetic steel slot

[0035] First buckle 7 at the second magnetic steel slot First buckle 23 at the sixth magnetic steel slot

[0036] Second magnetic steel slot 8 Third rare earth material magnetic steel 24

[0037] The first rare earth material magnet 9 and the first magnetic isolation bridge 31 in the middle

[0038] The second magnetic isolation bridge 32 in the middle of the second buckle 10 at the second magnetic steel slot

[0039] The third ferrite material magnet 11 and the first buckle 33 at the fourth magnet groove

[0040] First rivet hole 12 First boundary 34-35

[0041] Third magnetic steel slot 13 First buckle 36 at the third magnetic steel slot

[0042] The second buckle 14 at the fourth magnetic steel slot The second buckle 37 at the third magnetic steel slot

[0043] Second rare earth material magnetic steel 15 Second rivet hole 38

[0044] The third magnetic isolation bridge 16 at the outer diameter of the rotor DETAILED DESCRIPTION

[0045] The present invention will be described in detail below with reference to specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those skilled in the art, several changes and improvements can be made without departing from the scope of the present invention. These all fall within the scope of protection of the present invention.

[0046] According to the present invention, a motor rotor assembly unit using a hybrid permanent magnet material includes: a first rotor outer diameter circle 29, a second rotor outer diameter eccentric circle 30, a first magnetic steel slot 3, a second magnetic steel slot 8, a third magnetic steel slot 13, a fourth magnetic steel slot 17, a fifth magnetic steel slot 21, a sixth magnetic steel slot 26, a first magnetic isolation bridge 2 at the rotor outer diameter, a second magnetic isolation bridge 6 at the rotor outer diameter, a third magnetic isolation bridge 16 at the rotor outer diameter, a fourth magnetic isolation bridge 20 at the rotor outer diameter, a first intermediate magnetic isolation bridge 31, and a second intermediate magnetic isolation bridge 32;

[0047] The first rotor outer diameter circle 29, the second rotor outer diameter eccentric circle 30, the first magnetic steel slot 3, the second magnetic steel slot 8, the third magnetic steel slot 13, the fourth magnetic steel slot 17, the fifth magnetic steel slot 21, the sixth magnetic steel slot 26, the first magnetic isolation bridge 2 at the rotor outer diameter, the second magnetic isolation bridge 6 at the rotor outer diameter, the third magnetic isolation bridge 16 at the rotor outer diameter, the fourth magnetic isolation bridge 20 at the rotor outer diameter, the first magnetic isolation bridge 31 in the middle, and the second magnetic isolation bridge 32 in the middle are arranged on the rotor silicon steel 28.

[0048] The rotor further comprises: a first rare earth material magnetic steel 9, a second rare earth material magnetic steel 15, a third rare earth material magnetic steel 24, a first ferrite material magnetic steel 4, a second ferrite material magnetic steel 19, a third ferrite material magnetic steel 11, a rotor silicon steel 28, a first clip 1 at the first magnetic steel slot, a second clip 5 at the first magnetic steel slot, a first clip 7 at the second magnetic steel slot, a second clip 10 at the second magnetic steel slot, a first clip 36 at the third magnetic steel slot, a second clip 37 at the third magnetic steel slot, a first clip 33 at the fourth magnetic steel slot, a second clip 14 at the fourth magnetic steel slot, a first clip 22 at the fifth magnetic steel slot, a second clip 18 at the fifth magnetic steel slot, a first clip 23 at the sixth magnetic steel slot, and a second clip 25 at the sixth magnetic steel slot;

[0049] The first rare earth material magnet 9, the second rare earth material magnet 15, the third rare earth material magnet 24, the first ferrite material magnet 4, the second ferrite material magnet 19, the third ferrite material magnet 11, the rotor silicon steel 28, the first clip 1 at the first magnetic steel slot, the second clip 5 at the first magnetic steel slot, the first clip 7 at the second magnetic steel slot, the second clip 10 at the second magnetic steel slot, the first clip 36 at the third magnetic steel slot, the second clip 37 at the third magnetic steel slot, the first clip 33 at the fourth magnetic steel slot, the second clip 14 at the fourth magnetic steel slot, the first clip 22 at the fifth magnetic steel slot, the second clip 18 at the fifth magnetic steel slot, the first clip 23 at the sixth magnetic steel slot, and the second clip 25 at the sixth magnetic steel slot are arranged on the rotor silicon steel 28.

[0050] The present invention provides a motor rotor assembly unit and motor rotor utilizing hybrid permanent magnet materials. These effectively address the shortcomings of conventional rare earth permanent magnet synchronous motors, such as high cost, high high-speed AC losses, and low efficiency under NEDC high-speed conditions. Furthermore, by utilizing a double-layer, U-shaped, internally-mounted hybrid permanent magnet material, the performance degradation caused by the reduction of rare earth permanent magnets is effectively compensated, while increasing reluctance torque and improving the motor's salient pole ratio, enabling the motor to operate smoothly with high power, low fluctuations, wide speed regulation, and fast response. The rotor is provided with double-layer, U-shaped magnetic steel slots, comprising a first U-shaped magnetic steel slot and a second U-shaped magnetic steel slot. The first U-shaped magnetic steel slot is close to the rotor's outer curved surface, while the second U-shaped magnetic steel slot forms a wrapping structure with the first U-shaped magnetic steel slot. The specific magnet slot dimensions, arrangement, rotor outer diameter, and effective hybrid permanent magnet material design successfully address the low efficiency of conventional rare earth permanent magnet motors under high-speed NEDC conditions. While ensuring the mechanical strength of the rotor core, the motor can output the required torque and power, achieving low torque ripple across the entire speed range and improving controllability. The design of the rotor outer surface shape, magnet slot shape, rotor outer diameter, and number of layers effectively reduces back EMF harmonics and cogging torque.

[0051] Preferably, it further comprises: a first rivet hole 12, a second rivet hole 38, and a third rivet hole 27;

[0052] The first rivet hole 12 , the second rivet hole 38 , and the third rivet hole 27 are disposed on the rotor silicon steel 28 .

[0053] Preferably, the first ferrite material magnet 4 is embedded in the first magnet groove 3 and connected to the first clip 1 at the first magnet groove and the second clip 5 at the first magnet groove; the clip plays a role in positioning and fixing the first ferrite material magnet 4.

[0054] Preferably, the first rare earth material magnet 9 is embedded in the second magnet groove 8 and connected to the first clip 7 at the second magnet groove and the second clip 10 at the second magnet groove. The clips play a role in positioning and fixing the first rare earth material magnet 9.

[0055] Preferably, the second ferrite material magnet 19 is embedded in the fifth magnetic steel slot 21 and connected to the first clip 22 at the fifth magnetic steel slot and the second clip 18 at the fifth magnetic steel slot. The clip plays a role in positioning and fixing the second ferrite material magnet 19.

[0056] Preferably, the second rare earth material magnet 15 is embedded in the fourth magnetic steel slot 17 and connected to the first clip 33 at the fourth magnetic steel slot and the second clip 14 at the fourth magnetic steel slot. The clips play a role in positioning and fixing the second rare earth material magnet 15.

[0057] Preferably, the third ferrite material magnet 11 is embedded in the third magnet groove 13 and connected to the first clip 36 at the third magnet groove and the second clip 37 at the third magnet groove. The clips play a role in positioning and fixing the third ferrite material magnet 11.

[0058] Preferably, the third rare earth material magnet 24 is embedded in the sixth magnetic steel slot 26 and connected to the first clip 23 at the sixth magnetic steel slot and the second clip 25 at the sixth magnetic steel slot. The clips play a role in positioning and fixing the third rare earth material magnet 24.

[0059] Specifically, in one embodiment, Figures 1 to 5 As shown, a motor rotor assembly unit using hybrid permanent magnet materials uses two different permanent magnet materials to increase motor torque by improving the motor magnetic steel slot shape and the motor rotor outer circle shape, while changing the air gap flux density shape to reduce the motor back electromotive force harmonics. The structure is novel, wherein:

[0060] The rotor assembly unit includes: a first rotor outer diameter circle 29, a second rotor outer diameter eccentric circle 30, a first magnetic steel slot 3, a second magnetic steel slot 8, a third magnetic steel slot 13, a fourth magnetic steel slot 17, a fifth magnetic steel slot 21, a sixth magnetic steel slot 26, a first magnetic isolation bridge 2 at the rotor outer diameter, a second magnetic isolation bridge 6 at the rotor outer diameter, a third magnetic isolation bridge 16 at the rotor outer diameter, a fourth magnetic isolation bridge 20 at the rotor outer diameter, a first magnetic isolation bridge 31 in the middle, a second magnetic isolation bridge 32 in the middle, a first rare earth material magnetic steel 9, a second rare earth material magnetic steel 15, a third rare earth material magnetic steel 24, a first ferrite material magnetic steel 4, a second ferrite material magnetic steel 19. The third ferrite material magnet 11, the rotor silicon steel 28, the first clip 1 at the first magnetic steel slot, the second clip 5 at the first magnetic steel slot, the first clip 7 at the second magnetic steel slot, the second clip 10 at the second magnetic steel slot, the first clip 36 at the third magnetic steel slot, the second clip 37 at the third magnetic steel slot, the first clip 33 at the fourth magnetic steel slot, the second clip 14 at the fourth magnetic steel slot, the first clip 22 at the fifth magnetic steel slot, the second clip 18 at the fifth magnetic steel slot, the first clip 23 at the sixth magnetic steel slot, the second clip 25 at the sixth magnetic steel slot, the first rivet hole 12, the second rivet hole 38, and the third rivet hole 27.

[0061] The matching relationship of the rotor assembly unit: the first rotor outer diameter circle 29, the second rotor outer diameter eccentric circle 30, the first magnetic steel slot 3, the second magnetic steel slot 8, the third magnetic steel slot 13, the fourth magnetic steel slot 17, the fifth magnetic steel slot 21, the sixth magnetic steel slot 26, the first magnetic isolation bridge 2 at the rotor outer diameter, the second magnetic isolation bridge 6 at the rotor outer diameter, the third magnetic isolation bridge 16 at the rotor outer diameter, the fourth magnetic isolation bridge 20 at the rotor outer diameter, the middle first magnetic isolation bridge 31, the middle second magnetic isolation bridge 32, the first rare earth material magnetic steel 9, the second rare earth material magnetic steel 15, the third rare earth material magnetic steel 24, the first ferrite material magnetic steel 4, the second ferrite material magnetic steel 19, The third ferrite material magnet 11, the rotor silicon steel 28, the first clip 1 at the first magnetic steel slot, the second clip 5 at the first magnetic steel slot, the first clip 7 at the second magnetic steel slot, the second clip 10 at the second magnetic steel slot, the first clip 36 at the third magnetic steel slot, the second clip 37 at the third magnetic steel slot, the first clip 33 at the fourth magnetic steel slot, the second clip 14 at the fourth magnetic steel slot, the first clip 22 at the fifth magnetic steel slot, the second clip 18 at the fifth magnetic steel slot, the first clip 23 at the sixth magnetic steel slot, the second clip 25 at the sixth magnetic steel slot, the first rivet hole 12, the second rivet hole 38, and the third rivet hole 27 are on the rotor silicon steel 28.

[0062] The first ferrite magnet 4 is embedded in the first magnetic steel slot 3 and connected to the first clip 1 and the second clip 5 at the first magnetic steel slot. The clips serve to position and secure the first ferrite magnet 4. The first rare earth magnet 9 is embedded in the second magnetic steel slot 8 and connected to the first clip 7 and the second clip 10 at the second magnetic steel slot. The clips serve to position and secure the first rare earth magnet 9. The second ferrite magnet 19 is embedded in the fifth magnetic steel slot 21 and connected to the first clip 22 and the second clip 18 at the fifth magnetic steel slot. The clips serve to position and secure the second ferrite magnet 19. The second rare earth magnet 15 is embedded in the fourth magnetic steel slot 17 and connected to the first clip 33 and the second clip 14 at the fourth magnetic steel slot. The clips serve to position and secure the second rare earth magnet 15. The third ferrite magnet 11 is embedded in the third magnetic steel slot 13 and connected to the first and second clips 36 and 37 therein. These clips position and secure the third ferrite magnet 11. The third rare earth magnet 24 is embedded in the sixth magnetic steel slot 26 and connected to the first and second clips 23 and 25 therein. These clips position and secure the third rare earth magnet 24.

[0063] The second rotor outer diameter eccentric circle 30, the first boundary 34 and the second boundary E are concentric circles, and the first boundary 34 and the second boundary E are on the same pitch circle. The thickness is L13, generally between 1mm and 2mm, and needs to be adjusted according to the maximum speed of the motor and the stress of the punching sheet at that location.

[0064] The second boundary includes: a second boundary A position, a second boundary B position, a second boundary C position, a second boundary D position, a second boundary E position, a second boundary F position, a second boundary G position, a second boundary H position, a second boundary I position, and a second boundary J position.

[0065] The second rotor outer diameter eccentric circle 30 has a width of an angle α, wherein for the period angle β, the specific parameters α / β are adjusted according to the motor performance, especially in optimizing the torque ripple performance.

[0066] The first magnetic isolation bridge 2 at the outer diameter of the rotor, the second magnetic isolation bridge 6 at the outer diameter of the rotor, the third magnetic isolation bridge 16 at the outer diameter of the rotor, and the fourth magnetic isolation bridge 20 at the outer diameter of the rotor generally have a thickness between 1 mm and 2 mm, and need to be adjusted according to the maximum speed of the motor and the stress of the punching sheet at that location. The width of the first magnetic bridge 31 in the middle and the length of the second magnetic bridge 32 in the middle are L14 and L15, and L14 is generally between 1 mm and 2 mm. The actual sizes of the magnetic isolation bridges 2, 20, 6, 16, L14 and L15 need to be appropriately adjusted according to the leakage magnetic conditions and the stress exerted on the rotor at the maximum speed.

[0067] The third boundary includes: a third boundary X position, a third boundary Y position, a third boundary Z position, and a third boundary W position.

[0068] The angle γ of the first magnetic steel slot 3, the fifth magnetic steel slot 21, the first ferrite material magnetic steel 4, and the second ferrite material magnetic steel 19 is generally between 45 and 150 degrees. The specific size should be determined according to the torque pulsation, maximum torque and back electromotive force. L1, L2, L9, L10, L11, L12 and the γ angle should be appropriately adjusted according to the back electromotive force, maximum torque and magnetic steel demagnetization.

[0069] The angle δ of the second magnetic steel slot 8, the fourth magnetic steel slot 17, the first rare earth material magnetic steel 9, and the second rare earth material magnetic steel 15 is generally between 45 and 180 degrees. The specific size should be determined according to the torque pulsation, maximum torque and back electromotive force. L3, L4, L5, L6, L7, L8 and the δ angle should be appropriately adjusted according to the back electromotive force, maximum torque and magnetic steel demagnetization.

[0070] The working principle of the patent of the present invention is as follows: by adjusting the angle, thickness and length between the first ferrite material magnet 4 and the second ferrite material magnet 19, and the angle, thickness and length between the first rare earth material magnet 9 and the second rare earth material magnet 15, the combination of the permanent magnet torque and the magnetic resistance torque of the motor is adjusted to obtain an optimal torque. In order to increase the mechanical strength of the punching sheet, the punching sheet needs to be corrected, so the first magnetic isolation bridge 2 at the outer diameter of the rotor, the second magnetic isolation bridge 6 at the outer diameter of the rotor, the third magnetic isolation bridge 16 at the outer diameter of the rotor, the fourth magnetic isolation bridge 20 at the outer diameter of the rotor, the middle first magnetic isolation bridge 31, and the middle second magnetic isolation bridge 32 are designed to increase the mechanical strength of the motor. At the same time, the torque drop caused by the decrease in magnetic flux due to excessive leakage magnetic flux must also be considered.

[0071] The torque ripple, cogging torque and back electromotive force waveform are optimized by adjusting the rotor outer diameter circle 29, the rotor outer diameter eccentric circle 30 and the angles α, β, γ and δ to improve the controllability of the motor.

[0072] According to the present invention, a motor rotor is provided, comprising: a motor rotor assembly unit using a hybrid permanent magnetic material; the number of the motor rotor assembly units using the hybrid permanent magnetic material is multiple; and the multiple motor rotor assembly units using the hybrid permanent magnetic material are arranged sequentially along the circumferential direction.

[0073] Specifically, in one embodiment, a permanent magnet motor rotor structure using hybrid permanent magnet materials is provided, wherein:

[0074] The rotor assembly unit includes: a first rotor outer diameter circle, a second rotor outer diameter eccentric circle, a first magnetic steel slot, a second magnetic steel slot, a third magnetic steel slot, a fourth magnetic steel slot, a fifth magnetic steel slot, a sixth magnetic steel slot, a first magnetic isolation bridge at the rotor outer diameter, a second magnetic isolation bridge at the rotor outer diameter, a third magnetic isolation bridge at the rotor outer diameter, a fourth magnetic isolation bridge at the rotor outer diameter, a first magnetic isolation bridge in the middle, a second magnetic isolation bridge in the middle, a first rare earth material magnetic steel, a second rare earth material magnetic steel, a third rare earth material magnetic steel, a first ferrite material magnetic steel, a second ferrite material Magnet, third ferrite material magnet, rotor silicon steel, first clip at the first magnetic steel slot, second clip at the first magnetic steel slot, first clip at the second magnetic steel slot, second clip at the second magnetic steel slot, first clip at the third magnetic steel slot, second clip at the third magnetic steel slot, first clip at the fourth magnetic steel slot, second clip at the fourth magnetic steel slot, first clip at the fifth magnetic steel slot, second clip at the fifth magnetic steel slot, first clip at the sixth magnetic steel slot, second clip at the sixth magnetic steel slot, first rivet hole, second rivet hole, third rivet hole.

[0075] Material properties of the rotor assembly unit:

[0076] A. Air: first magnetic steel slot, second magnetic steel slot, third magnetic steel slot, fourth magnetic steel slot, fifth magnetic steel slot, sixth magnetic steel slot, first rivet hole, second rivet hole, third rivet hole.

[0077] B. Silicon steel: the first magnetic isolation bridge at the outer diameter of the rotor, the second magnetic isolation bridge at the outer diameter of the rotor, the third magnetic isolation bridge at the outer diameter of the rotor, the fourth magnetic isolation bridge at the outer diameter of the rotor, the first magnetic isolation bridge in the middle, the second magnetic isolation bridge in the middle, rotor silicon steel, the first clip at the first magnetic steel slot, the second clip at the first magnetic steel slot, the first clip at the second magnetic steel slot, the second clip at the second magnetic steel slot, the first clip at the third magnetic steel slot, the second clip at the third magnetic steel slot, the first clip at the fourth magnetic steel slot, the second clip at the fourth magnetic steel slot, the first clip at the fifth magnetic steel slot, the second clip at the fifth magnetic steel slot, the first clip at the sixth magnetic steel slot, and the second clip at the sixth magnetic steel slot.

[0078] C. Magnets: first rare earth material magnet, second rare earth material magnet, third rare earth material magnet, first ferrite material magnet, second ferrite material magnet, third ferrite material magnet.

[0079] The matching relationship of the rotor assembly unit: the first rotor outer diameter circle, the second rotor outer diameter eccentric circle, the first magnetic steel slot, the second magnetic steel slot, the third magnetic steel slot, the fourth magnetic steel slot, the fifth magnetic steel slot, the sixth magnetic steel slot, the first magnetic isolation bridge at the rotor outer diameter, the second magnetic isolation bridge at the rotor outer diameter, the third magnetic isolation bridge at the rotor outer diameter, the fourth magnetic isolation bridge at the rotor outer diameter, the first magnetic isolation bridge in the middle, the second magnetic isolation bridge in the middle, the first clip at the first magnetic steel slot, the second clip at the second magnetic steel slot, the first clip at the third magnetic steel slot, the second clip at the third magnetic steel slot, the first clip at the fourth magnetic steel slot, the second clip at the fourth magnetic steel slot, the first clip at the fifth magnetic steel slot, the second clip at the fifth magnetic steel slot, the first clip at the sixth magnetic steel slot, the second clip at the sixth magnetic steel slot, the first rivet hole, the second rivet hole, and the third rivet hole are on the rotor silicon steel.

[0080] The first ferrite magnet is embedded in the first magnetic steel slot and connected to the first and second clips at the first magnetic steel slot. The clips serve to position and secure the first ferrite magnet. The first rare earth magnet is embedded in the second magnetic steel slot and connected to the first and second clips at the second magnetic steel slot. The clips serve to position and secure the first rare earth magnet. The second ferrite magnet is embedded in the fifth magnetic steel slot and connected to the first and second clips at the fifth magnetic steel slot. The clips serve to position and secure the second ferrite magnet. The second rare earth magnet is embedded in the fourth magnetic steel slot and connected to the first and second clips at the fourth magnetic steel slot. The clips serve to position and secure the second rare earth magnet. The third ferrite magnet is embedded in the third magnetic steel slot and connected to the first and second clips therein. The clips position and secure the third ferrite magnet. The third rare earth magnet is embedded in the sixth magnetic steel slot and connected to the first and second clips therein. The clips position and secure the third rare earth magnet.

[0081] This invention compensates for the performance degradation caused by reducing the amount of rare earth permanent magnets by increasing the amount of ferrite magnets used. This significantly reduces the overall magnet cost while maintaining motor performance, improving the motor's efficiency under NEDC high-speed operating conditions. The built-in magnet slot structure utilizes a combination of rare earth and ferrite magnets, further enhancing torque output. Furthermore, the rotor outer diameter design and the magnet slot shape, size, and location design reduce the motor's air gap flux density harmonics, maintaining excellent low-torque ripple characteristics across the entire motor speed range and improving the motor's controllability.

[0082] In the description of this application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0083] The above describes specific embodiments of the present invention. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art may make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. The embodiments of this application and the features in the embodiments may be combined with each other in any manner unless there is a conflict.

Claims

1. A motor rotor assembly unit using a hybrid permanent magnet material, characterized in that: include: A first rotor outer diameter circle (29), a second rotor outer diameter eccentric circle (30), a first magnetic steel slot (3), a second magnetic steel slot (8), a third magnetic steel slot (13), a fourth magnetic steel slot (17), a fifth magnetic steel slot (21), a sixth magnetic steel slot (26), a first magnetic isolation bridge (2) at the rotor outer diameter, a second magnetic isolation bridge (6) at the rotor outer diameter, a third magnetic isolation bridge (16) at the rotor outer diameter, a fourth magnetic isolation bridge (20) at the rotor outer diameter, a first intermediate magnetic isolation bridge (31), and a second intermediate magnetic isolation bridge (32); The first rotor outer diameter circle (29), the second rotor outer diameter eccentric circle (30), the first magnetic steel slot (3), the second magnetic steel slot (8), the third magnetic steel slot (13), the fourth magnetic steel slot (17), the fifth magnetic steel slot (21), the sixth magnetic steel slot (26), the first magnetic isolation bridge (2) at the rotor outer diameter, the second magnetic isolation bridge (6) at the rotor outer diameter, the third magnetic isolation bridge (16) at the rotor outer diameter, the fourth magnetic isolation bridge (20) at the rotor outer diameter, the middle first magnetic isolation bridge (31), and the middle second magnetic isolation bridge (32) are arranged on the rotor silicon steel (28); It also includes: a first rare earth material magnetic steel (9), a second rare earth material magnetic steel (15), a third rare earth material magnetic steel (24), a first ferrite material magnetic steel (4), a second ferrite material magnetic steel (19), a third ferrite material magnetic steel (11), a rotor silicon steel (28), a first snap-on (1) at the first magnetic steel slot, a second snap-on (5) at the first magnetic steel slot, a first snap-on (7) at the second magnetic steel slot, a second snap-on (10) at the second magnetic steel slot, a first snap-on (36) at the third magnetic steel slot, a second snap-on (37) at the third magnetic steel slot, a first snap-on (33) at the fourth magnetic steel slot, a second snap-on (14) at the fourth magnetic steel slot, a first snap-on (22) at the fifth magnetic steel slot, a second snap-on (18) at the fifth magnetic steel slot, a first snap-on (23) at the sixth magnetic steel slot, and a second snap-on 25 at the sixth magnetic steel slot; The first rare earth material magnetic steel (9), the second rare earth material magnetic steel (15), the third rare earth material magnetic steel (24), the first ferrite material magnetic steel (4), the second ferrite material magnetic steel (19), the third ferrite material magnetic steel (11), the rotor silicon steel (28), the first snap-on (1) at the first magnetic steel slot, the second snap-on (5) at the first magnetic steel slot, the first snap-on (7) at the second magnetic steel slot, the second snap-on (10) at the second magnetic steel slot, the first snap-on (36) at the third magnetic steel slot, the second snap-on (37) at the third magnetic steel slot, the first snap-on (33) at the fourth magnetic steel slot, the second snap-on (14) at the fourth magnetic steel slot, the first snap-on (22) at the fifth magnetic steel slot, the second snap-on (18) at the fifth magnetic steel slot, the first snap-on (23) at the sixth magnetic steel slot, and the second snap-on (25) at the sixth magnetic steel slot are arranged on the rotor silicon steel (28); It also includes: a first rivet hole (12), a second rivet hole (38), and a third rivet hole (27); The first rivet hole (12), the second rivet hole (38), and the third rivet hole (27) are arranged on the rotor silicon steel (28); The second rotor outer diameter eccentric circle, the first boundary and the second boundary E are concentric circles, and the first boundary and the second boundary E are on the same pitch circle.

2. The motor rotor assembly unit using hybrid permanent magnet material according to claim 1, characterized in that: The first ferrite material magnet (4) is embedded in the first magnet groove (3) and connected to the first clip (1) at the first magnet groove and the second clip (5) at the first magnet groove; the clip plays a role in positioning and fixing the first ferrite material magnet (4).

3. The motor rotor assembly unit using hybrid permanent magnet material according to claim 1, characterized in that: The first rare earth material magnet (9) is embedded in the second magnet groove (8) and connected to the first clip (7) at the second magnet groove and the second clip (10) at the second magnet groove. The clip plays a role in positioning and fixing the first rare earth material magnet (9).

4. The motor rotor assembly unit using hybrid permanent magnet material according to claim 1, characterized in that: The second ferrite material magnet (19) is embedded in the fifth magnet groove (21) and connected to the first clip (22) at the fifth magnet groove and the second clip (18) at the fifth magnet groove. The clip plays a role in positioning and fixing the second ferrite material magnet (19).

5. The motor rotor assembly unit using hybrid permanent magnet material according to claim 1, characterized in that: The second rare earth material magnet (15) is embedded in the fourth magnet groove (17) and connected to the first clip (33) at the fourth magnet groove and the second clip (14) at the fourth magnet groove. The clip plays a role in positioning and fixing the second rare earth material magnet (15).

6. The motor rotor assembly unit using hybrid permanent magnet material according to claim 1, characterized in that: The third ferrite material magnet (11) is embedded in the third magnet groove (13) and connected to the first clip (36) at the third magnet groove and the second clip (37) at the third magnet groove. The clip plays a role in positioning and fixing the third ferrite material magnet (11).

7. The motor rotor assembly unit using hybrid permanent magnet material according to claim 1, characterized in that: The third rare earth material magnet (24) is embedded in the sixth magnet groove (26) and connected to the first clip (23) at the sixth magnet groove and the second clip 25 at the sixth magnet groove. The clip plays a role in positioning and fixing the third rare earth material magnet (24).

8. A motor rotor, characterized in that: A motor rotor assembly unit comprising any one of claims 1 to 7 using a hybrid permanent magnet material; There are multiple motor rotor assembly units using hybrid permanent magnet materials.

9. The motor rotor according to claim 8, characterized in that: A plurality of motor rotor assembly units utilizing hybrid permanent magnetic materials are sequentially arranged along the circumferential direction.

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