A low-speed multi-pole permanent magnet motor rotor structure

Abstract

The utility model discloses a low -speed many pole number permanent magnet machine rotor structure relates to permanent magnet machine technical field, aims at solving the technical problem that permanent magnet bottom does the isolation magnetic processing and can cause rotor structure complex and reliability reduces. Its technical scheme main points are: including rotor support, be provided with rotor iron core on the rotor support, the both ends of rotor iron core are provided with first rotor end plate and second rotor end plate respectively, are set up with a plurality of punching piece grooves on rotor iron core, and punching piece groove is through in rotor iron core, and three permanent magnets are all provided in punching piece groove, three permanent magnets adopt three -segment type "U" type structure, and the top of "U" type structure all is provided with two isolation magnetic bridge, is set up with a plurality of pressing plate groove on first rotor end plate, and pressing plate groove all is provided with pressing plate, and the pressing plate cover is established in "U" type structure. The utility model discloses purposes at providing a kind of low -speed many pole number permanent magnet machine rotor structure.

Description

Technical Field

[0001] This utility model relates to permanent magnet motors, and more specifically, to a rotor structure for a low-speed, multi-pole permanent magnet motor. Background Technology

[0002] Permanent magnet synchronous motors have advantages such as small size, light weight, high torque density, high efficiency and power factor, and are widely used in industrial and aerospace fields.

[0003] The key technical features of the motor rotor and permanent magnet synchronous motor disclosed in Chinese Patent Publication No. CN222706324U are as follows: The motor rotor includes: a rotor support; rotor magnetic poles, which are sleeved on the outer peripheral surface of the rotor support and are spaced apart; and a magnetically shielding connector, which includes a connecting body and a connecting portion disposed on the outer peripheral surface of the connecting body. The rotor magnetic poles are connected to the rotor support through the connecting body, and the connecting portion is disposed between the rotor magnetic poles and the rotor support. The connecting body and the connecting portion are integrally formed.

[0004] The above technical solution adopts a tangential arrangement topology with permanent magnets built in. However, the tangential arrangement of permanent magnets must take into account the magnetic leakage problem at the bottom of the permanent magnets. The more poles the motor has, the greater the corresponding magnetic leakage coefficient. Magnetic isolation treatment at the bottom of the permanent magnets is required during the design, which leads to a complex rotor structure and reduced reliability.

[0005] Therefore, a new technical solution is urgently needed to solve the above-mentioned technical problems. Utility Model Content

[0006] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a rotor structure for a low-speed multi-pole permanent magnet motor.

[0007] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a rotor structure for a low-speed multi-pole permanent magnet motor, including a rotor support, a rotor core disposed on the rotor support, a first rotor end plate and a second rotor end plate respectively disposed at both ends of the rotor core, a plurality of lamination slots being formed on the rotor core, the lamination slots penetrating the rotor core, characterized in that: three permanent magnets are disposed in each lamination slot, the three permanent magnets adopt a three-section "U"-shaped structure, two magnetic isolation bridges are disposed at the top of each "U"-shaped structure, a plurality of pressure plate slots are formed on the first rotor end plate, a pressure plate is disposed in each pressure plate slot, the pressure plate covers the "U"-shaped structure, and a plurality of abutment components for positioning the rotor core are also disposed at both ends of the rotor support.

[0008] By adopting the above technical solution: the "U"-shaped structure can reduce the length of the permanent magnet in the magnetization direction to 1 / 3-1 / 2 of that of a simple tangential arrangement. Without increasing the amount of permanent magnets used, the leakage coefficient of the permanent magnet is significantly reduced. The first rotor end plate and the second rotor end plate can provide corresponding contact between the two ends of the permanent magnet and the rotor core. The magnetic isolation bridge optimizes the magnetic circuit by controlling the leakage coefficient, which can balance the electromagnetic performance. The pressure plate can play a certain protective role, preventing the permanent magnet from directly contacting the external environment and reducing the possibility of the permanent magnet being damaged by corrosion, wear and other factors.

[0009] The present invention is further configured such that: a plurality of first positioning holes are provided on the rotor core, the pressure plate and the second rotor end plate, and a first pull rod is provided on the pressure plate, the first pull rod passing through the first positioning holes of the rotor core, the pressure plate and the second rotor end plate.

[0010] The present invention is further configured such that: a second positioning hole is provided on the first rotor end plate, the rotor core, and the second rotor end plate; a second pull rod is provided on the first rotor end plate; and the second pull rod passes through the second positioning hole of the first rotor end plate, the rotor core, and the second rotor end plate.

[0011] The present invention is further configured such that the thickness of the magnetic isolation bridge is 1-3mm.

[0012] The present invention is further configured such that: an air groove is formed between the three permanent magnets and the top and bottom of the lamination groove, and the number of the air grooves is four.

[0013] The present invention is further configured such that an angle of 5-10° is formed between adjacent “U”-shaped structures.

[0014] The present invention is further configured such that: a plurality of third positioning holes are provided on the rotor core, the third positioning holes penetrate the rotor core, and the third positioning holes are located between two adjacent second positioning holes.

[0015] The present invention is further configured such that: a plurality of first positioning rods are provided on the first rotor end plate, and a plurality of second positioning rods are provided on the second rotor end plate.

[0016] The present invention has the following beneficial effects: 1. The "U" shaped structure can significantly reduce the leakage coefficient of permanent magnets.

[0017] 2. The first and second tie rods maintain the positional accuracy of the corresponding components in the axial and radial directions.

[0018] 3. The air groove at the top assists the magnetic isolation bridge to further isolate the magnets, while the air groove at the bottom serves to isolate the magnets at the bottom of the permanent magnet.

[0019] 4. The first positioning rod and the second positioning rod are inserted into the third positioning hole to achieve one-time accurate positioning of the corresponding parts, thereby improving the overall assembly efficiency. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of this embodiment;

[0021] Figure 2 This is a three-dimensional structural schematic diagram from another perspective of this embodiment;

[0022] Figure 3 This is an exploded view of this embodiment;

[0023] Figure 4 This is an example. Figure 3 A magnified view of part A in the diagram;

[0024] Figure 5 This is an exploded view from another perspective of this embodiment.

[0025] Figure descriptions: 1. Rotor support; 2. Rotor core; 3. First rotor end plate; 4. Second rotor end plate; 5. Lamination slot; 6. Permanent magnet; 7. Magnetic bridge; 8. Pressure plate slot; 9. Pressure plate; 10. First positioning hole; 11. First tie rod; 12. Second positioning hole; 13. Second tie rod; 14. Air groove; 15. Third positioning hole; 16. First positioning rod; 17. Second positioning rod. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to the accompanying drawings.

[0027] Identical parts are indicated by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, while the terms "bottom surface," "top surface," "inner," and "outer" refer to directions toward or away from the geometric center of a specific part, respectively.

[0028] like Figures 1 to 4 As shown, a rotor structure for a low-speed multi-pole permanent magnet motor includes a rotor support 1, a rotor core 2 mounted on the rotor support 1, a first rotor end plate 3 and a second rotor end plate 4 mounted at both ends of the rotor core 2, a plurality of lamination slots 5 extending through the rotor core 2, and three permanent magnets 6 mounted in each lamination slot 5. The three permanent magnets 6 adopt a three-section "U"-shaped structure, and two magnetic isolation bridges 7 are mounted on the top of each "U"-shaped structure. A plurality of pressure plate slots 8 are mounted on the first rotor end plate 3, and pressure plates 9 are mounted in each pressure plate slot 8, covering the "U"-shaped structure.

[0029] In use, the rotor core 2 is installed on the rotor support 1, and three permanent magnets 6 are simultaneously passed through a lamination slot 5 and designed as a "U" shape. This reduces the magnetization length of the permanent magnets 6 to 1 / 3-1 / 2 of that of a purely tangential arrangement. Without increasing the overall amount of permanent magnets 6, the leakage coefficient of the permanent magnets 6 is significantly reduced. The first rotor end plate 3 and the second rotor end plate 4 provide corresponding contact with the two ends of the permanent magnets 6 and the rotor core 2. The magnetic isolation bridge 7 optimizes the magnetic circuit by controlling the leakage coefficient, which can balance the electromagnetic performance. The pressure plate 9 provides a certain degree of protection, preventing the permanent magnets 6 from directly contacting the external environment and reducing the possibility of corrosion, wear, and other damage to the permanent magnets 6. This low-speed multi-pole permanent magnet motor rotor structure, while meeting the performance index of each "U" shape not less than that of a purely tangential arrangement of permanent magnets 6, simplifies the installation process of the first rotor end plate 3, the second rotor end plate 4, the rotor core 2, and the pressure plate 9. It can be widely used in low-speed, high-torque direct-drive permanent magnet motors.

[0030] like Figures 3 to 5 As shown, the rotor core 2, the pressure plate 9, and the second rotor end plate 4 are all provided with a number of first positioning holes 10. The pressure plate 9 is provided with a first pull rod 11, which passes through the first positioning holes 10 of the rotor core 2, the pressure plate 9, and the second rotor end plate 4.

[0031] The rotor core 2, pressure plate 9, and second rotor end plate 4 are stacked and fixed into a whole by the first tie rod 11, ensuring the stability of the rotor structure. The first positioning hole 10 and the first tie rod 11 play a precise positioning role, which can ensure the axial and radial positional accuracy of the rotor core 2, pressure plate 9, and second rotor end plate 4.

[0032] like Figures 3 to 5 As shown, a second positioning hole 12 is provided on the first rotor end plate 3, the rotor core 2, and the second rotor end plate 4. A second pull rod 13 is provided on the first rotor end plate, and the second pull rod 13 passes through the second positioning hole 12 of the first rotor end plate 3, the rotor core 2, and the second rotor end plate 4.

[0033] The first rotor end plate 3, rotor core 2, and second rotor end plate 4 are stacked and fixed into a whole by the second tie rod 13 to ensure the overall stability of the structure. The second positioning hole 12 and the second tie rod 13 play a precise positioning role, which can ensure the positional accuracy of the first rotor end plate 3, rotor core 2, and second rotor end plate 4 in the axial and radial directions.

[0034] like Figure 4As shown, the thickness of the magnetic isolation bridge 7 is 1-3mm; air grooves 14 are formed between the top and bottom of the three permanent magnets 6 and the lamination groove 5, and there are four air grooves 14; the air grooves 14 at the top assist the magnetic isolation bridge 7 to further isolate the magnetic field, and the air grooves 14 at the bottom play the role of insulating the bottom of the permanent magnets 6.

[0035] An angle of 5-10° is formed between adjacent "U"-shaped structures; a triangular pillar is formed between two adjacent "U"-shaped structures, which can effectively ensure the strength and rigidity of the rotor core 2 and greatly improve the overall reliability.

[0036] like Figures 3 to 5 As shown, the rotor core 2 is provided with several third positioning holes 15, which penetrate the rotor core 2 and are located between two adjacent second positioning holes 12; the first rotor end plate 3 is provided with several first positioning rods 16, and the second rotor end plate 4 is provided with several second positioning rods 17.

[0037] The number of the first positioning rod 16, the second positioning rod 17, and the third positioning hole 15 corresponds. During the installation of the first rotor end plate 3 onto the rotor core 2, the pressure plate groove 8 may not align with the lamination groove 5 in one go. Inserting the first positioning rod 16 into the third positioning hole 15 can achieve precise positioning between the first rotor end plate 3 and the rotor core 2, allowing for installation in one go without multiple positioning steps, thus improving the installation efficiency between the rotor core 2 and the first rotor end plate. During the installation of the second rotor terminal 4 onto the rotor core 2, the first positioning rod 16 may not align with the lamination groove 5 in one go. When the positioning hole 10 does not correspond to the first positioning hole of the rotor core 2, repeated alignment is required. Inserting the second positioning rod 17 into the third positioning hole 15 completes the installation in one go. Through the installation of the first positioning rod 16, the second positioning rod 17 and the third positioning hole 15, the pressure plate groove 8 can be accurately aligned with the lamination groove 5 in one go. The first positioning hole 10 on the rotor core 2, the pressure plate 9 and the second rotor end plate 4 can be accurately aligned in one go. The second positioning hole 12 on the first rotor end plate 3, the rotor core 2 and the second rotor end plate 4 can also be accurately aligned in one go.

[0038] The specific embodiments are merely explanations of this utility model and are not intended to limit it. After reading this specification, those skilled in the art can make modifications to these embodiments without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this utility model.

Claims

1. A rotor structure for a low-speed multi-pole permanent magnet motor, comprising a rotor support (1), a rotor core (2) disposed on the rotor support (1), a first rotor end plate (3) and a second rotor end plate (4) respectively disposed at both ends of the rotor core (2), and a plurality of lamination slots (5) formed on the rotor core (2), the lamination slots (5) penetrating the rotor core (2), characterized in that: Each of the lamination slots (5) is provided with three permanent magnets (6). The three permanent magnets (6) adopt a three-section "U"-shaped structure. Each of the "U"-shaped structures is provided with two magnetic isolation bridges (7). The first rotor end plate (3) is provided with several pressure plate slots (8). Each of the pressure plate slots (8) is provided with a pressure plate (9). The pressure plate (9) covers the "U"-shaped structure.

2. The rotor structure of a low-speed multi-pole permanent magnet motor according to claim 1, characterized in that: The rotor core (2), the pressure plate (9) and the second rotor end plate (4) are each provided with a number of first positioning holes (10). The pressure plate (9) is provided with a first pull rod (11), which passes through the first positioning holes (10) of the rotor core (2), the pressure plate (9) and the second rotor end plate (4).

3. The rotor structure of a low-speed multi-pole permanent magnet motor according to claim 2, characterized in that: The first rotor end plate (3), the rotor core (2) and the second rotor end plate (4) are all provided with second positioning holes (12). The first rotor end plate is provided with a second pull rod (13), which passes through the second positioning holes (12) of the first rotor end plate (3), the rotor core (2) and the second rotor end plate (4).

4. The rotor structure of a low-speed multi-pole permanent magnet motor according to claim 3, characterized in that: The thickness of the magnetic bridge (7) is 1-3 mm.

5. The rotor structure of a low-speed multi-pole permanent magnet motor according to claim 4, characterized in that: An air groove (14) is formed between the top and bottom of the three permanent magnets (6) and the lamination groove (5), and the number of the air grooves (14) is four.

6. The rotor structure of a low-speed multi-pole permanent magnet motor according to claim 5, characterized in that: An angle of 5-10° is formed between adjacent "U" shaped structures.

7. The rotor structure of a low-speed multi-pole permanent magnet motor according to claim 6, characterized in that: The rotor core (2) is provided with a plurality of third positioning holes (15), the third positioning holes penetrate the rotor core (2), and the third positioning holes (15) are located between two adjacent second positioning holes (12).

8. The rotor structure of a low-speed multi-pole permanent magnet motor according to claim 7, characterized in that: The first rotor end plate (3) is provided with a plurality of first positioning rods (16), and the second rotor end plate (4) is provided with a plurality of second positioning rods (17).

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