High-voltage double-rotor magnetic circuit structure

Abstract

This invention discloses a high-voltage dual-rotor magnetic circuit structure for a 710-1500KW, 10KV large-scale high-voltage variable frequency low-speed high-torque permanent magnet synchronous motor. The rotor includes a shaft, rotor support, magnetic shielding sleeve, middle ring, magnetic pole cores, and magnets. Two closely spaced rotor supports are fitted onto the shaft, and each rotor support is fitted with a magnetic shielding sleeve. A magnetic pole core is mounted on the outer cylindrical surface of each magnetic shielding sleeve. A magnet mounting groove is provided between adjacent magnetic pole cores, and a magnet is fixed in the magnet mounting groove. The magnetic shielding sleeve is divided into an inner magnetic shielding layer and an outer fixing layer. The outer fixing layer is made of magnetostrictive material. The middle ring is located between the two closely spaced rotor supports. The beneficial effects of this invention are: it realizes the slender rotor required for a high-voltage, high-power, low-speed, high-torque dual-rotor permanent magnet intelligent drive system; it has high torque and high operating accuracy; it reduces the cost of system projects; and it is small in size, light in weight, high in power density, and highly reliable.

Description

Technical Field

[0001] This invention falls under the technical category of rotor structure in the field of permanent magnet motor manufacturing, and particularly relates to a high-voltage dual-rotor magnetic circuit structure applied to slender rotors. Background Technology

[0002] Traditional electric motors typically have only one stator and one rotor, whether DC, synchronous, or asynchronous, and only one mechanical port. In recent years, the concept of a dual-rotor motor has been proposed. This type of motor has two mechanical shafts, allowing for independent energy transfer between them. This new type of motor significantly reduces the size and weight of equipment, improves work efficiency, effectively meets energy-saving and speed-regulation requirements, and boasts superior operating performance.

[0003] Dual-rotor permanent magnet motors utilize the principle of action and reaction forces, using the stator of a traditional motor as the outer rotor and the original rotor as the inner rotor, with both moving in opposite directions. The outer rotor has armature windings, while the inner rotor, equipped with permanent magnets, is also called a permanent magnet rotor. The magnetic field of the permanent magnets interacts with the magnetic field generated by the armature windings, producing electromagnetic torque. This dual-rotor structure cannot meet the requirements of slender motors.

[0004] To address the aforementioned issues, Chinese utility model patent CN201821173356.5 discloses an ultra-slender, high-efficiency permanent magnet synchronous motor for a submersible direct-drive pump used in downhole cylindrical operations. This motor includes a housing, a stator assembly, a rotor assembly, and a rotor shaft. The rotor shaft is an integral shaft. The rotor assembly comprises multiple unit rotors, each unit rotor consisting of a rotor core and a permanent magnet mounted on the rotor core. Each unit rotor is coaxially connected to the rotor shaft via its rotor core, and a bearing is provided between adjacent unit rotors. The stator assembly includes coil windings, as well as stator silicon steel laminations and stator copper laminations with dimensions matching the slot type. The length of the silicon steel core is equal to the length of the rotor core, and the width of the stator copper laminations is equal to the width of the bearings. All are fastened to the inner wall of the housing. The unit rotor, consisting of a rotor core and a permanent magnet mounted on the rotor core, with each unit rotor coaxially connected to the rotor shaft via its rotor core and a bearing between adjacent unit rotors, increases the number of structural components in the rotor, increases assembly difficulty, and increases the rotor's failure rate.

[0005] In summary, there is an urgent need for a high-voltage dual-rotor magnetic circuit structure to realize the slender rotor required for a high-voltage, high-power, low-speed, high-torque dual-rotor permanent magnet intelligent drive system. This structure offers high torque, high operational accuracy, reduced system project costs, small size, light weight, high power density, and high reliability. Summary of the Invention

[0006] To overcome the aforementioned defects in the prior art, the present invention provides a high-voltage dual-rotor magnetic circuit structure.

[0007] The specific technical solution adopted in this invention is as follows:

[0008] A high-voltage dual-rotor magnetic circuit structure is disclosed for a 710-1500KW, 10KV large high-voltage variable frequency low-speed high-torque permanent magnet synchronous motor. The rotor's length-to-diameter ratio is ≥11 and ≤20. The rotor includes a shaft, rotor support, magnetic shielding sleeve, intermediate ring, magnetic pole core, and magnets. Two closely spaced rotor supports are fitted onto the shaft. Each rotor support is fitted with a magnetic shielding sleeve. A magnetic pole core is mounted on the outer cylindrical surface of each magnetic shielding sleeve. A magnet mounting groove is provided between adjacent magnetic pole cores, and a magnet is fixed in the magnet mounting groove. The magnetic shielding sleeve consists of an inner magnetic shielding layer and an outer fixing layer. The outer fixing layer is made of magnetostrictive material. The intermediate ring is located between the two closely spaced rotor supports. This structural design is described below.

[0009] The dual-rotor magnetic circuit structure design, with its bidirectional rotor structure, generates a magnetic focusing effect, resulting in a magnetic induction intensity 20-40% stronger than that of a single magnet, allowing for full utilization of permanent magnet materials. The magnets are embedded within the rotor, protecting them from external damage and preventing them from detaching during motor operation due to vibration, adhesive failure, or other factors, thus enhancing operational stability. By magnetizing the conductive material, the magnets form magnetic poles that couple with the stator magnetic field to generate electromagnetic torque, overcoming the drawbacks of poor mechanical properties of permanent magnet materials that make them unsuitable for torque transmission. This design is suitable for low-speed, high-torque permanent magnet synchronous motors. The dual-rotor magnetic circuit structure employs a leakage-proof magnetic structure, ensuring the entire... The magnetic circuit exhibits low magnetic leakage, allowing for full utilization of the magnetic properties of the magnets. Compared to similar products, it saves 5%-10% on permanent magnet materials, resulting in corresponding savings in magnet material and further increasing the motor's power density. Compared to surface-mount series magnetic circuits, the rotor magnetic circuit adopts a parallel structure. The rotor magnetic poles formed by the magnetically conductive material produce a good sinusoidal waveform in the air gap magnetic field, effectively controlling torque fluctuations and preventing the generation of rectangular waves. Furthermore, the characteristics of the magnetostrictive material allow the rotor to appropriately increase its diameter in the radial direction during use, further reducing the air gap between the rotor and stator without rotor rubbing, improving magnetic flux utilization, and increasing the motor's output power.

[0010] The magnetic pole core is formed by stacking several magnetic pole laminations. The small volume magnetic pole lamination structure makes it easy to manufacture using amorphous gold materials.

[0011] The magnetic pole lamination has a fixed through hole in the middle, and the corresponding magnetic pole laminations on the two magnetic isolation sleeves are pressed together by a magnetic pole reinforcing key. This mechanism can press the magnetic pole laminations from the center, and the magnetic pole laminations are subjected to uniform force. At the same time, the fixing structure is hidden inside the magnetic pole core, which further reduces the volume of the rotor and simplifies the rotor mechanism.

[0012] The magnetic pole piece is fan-shaped, and this design has the following advantages:

[0013] This facilitates the formation of a circular ring from the magnetic pole pieces and provides a rectangular mounting space for the magnet mounting slot;

[0014] This allows for full utilization of raw materials during the blanking and layout of magnetic pole laminations;

[0015] It facilitates the use of small-sized amorphous gold materials.

[0016] The inner edge of the magnetic pole piece is provided with a dovetail protrusion, and the outer fixing layer of the magnetic shielding sleeve is provided with a dovetail groove. The dovetail protrusion is fixed in the dovetail groove. The dovetail structure connection method can ensure the firmness of the fixation and the accuracy of the installation. This is determined by the structural characteristics of the dovetail groove.

[0017] The middle ring is a magnetically shielding spacer made of magnetically shielding material, which, combined with the magnetically shielding sleeve, reduces magnetic leakage in the entire magnetic circuit and allows the magnetic properties of the magnets to be fully utilized.

[0018] The magnetic isolation partition plate is provided with corresponding through holes for connecting magnets. The rotor magnetic circuit adopts a parallel structure. The rotor magnetic poles formed by the magnetic conductive material have a good sinusoidal waveform in the air gap magnetic field, which can effectively control torque fluctuations and prevent the generation of rectangular waves.

[0019] The through hole has the same cross-sectional shape as the magnet, but the through hole is 0.1 mm larger than the corresponding cross-sectional shape of the magnet, which facilitates installation and ensures the accuracy of fixing the magnet in the magnet mounting slot.

[0020] The rotor fan is fixed on the magnetic pole core. This design, which uses magnetic pole fixing keys to fix the magnetic pole laminations, can effectively reduce the size of the fan and the number of parts used. At the same time, the magnetic isolation end plate serves to fix both the fan and the magnet. In this invention, the magnet, magnetic pole laminations and fan are fixed in one step.

[0021] The rotor fan includes a magnetic shielding end plate and fan blades. The magnetic shielding end plate and fan blades are an integral L-shaped structure, which further reduces the number of parts, simplifies the structure, and reduces the size.

[0022] The positive effects of this invention are:

[0023] 1. The design of the dual rotor realizes the slender rotor required for the high-voltage, high-power, low-speed, high-torque dual-rotor permanent magnet intelligent drive system, which has high torque and high running accuracy;

[0024] 2. The dovetail groove connection of the magnetic pole laminations and the magnetic steel mounting slot, along with the design of the magnetically shielded end plate fan, reduces the cost of the system project, resulting in a small size, light weight, high power density, and high reliability.

[0025] 3. The use of magnetostrictive materials enables the rotor to increase its diameter appropriately in the radial direction during use, further reducing the air gap between the rotor and stator without rubbing the rotor, improving magnetic flux utilization, and increasing the motor output power. Attached Figure Description

[0026] Figure 1 This is a rotor structure diagram of a high-voltage dual-rotor magnetic circuit structure according to the present invention;

[0027] Figure 2 This is a rotor side view of a high-voltage dual-rotor magnetic circuit structure according to the present invention;

[0028] Figure 3 This is a schematic diagram of the rotor magnet mounting groove of a high-voltage dual-rotor magnetic circuit structure according to the present invention;

[0029] Legend: 1—Shaft, 2—Magnetic isolation spacer, 3—Magnetic pole core, 4—Magnetic pole reinforcing key, 5—Right magnetic isolation sleeve, 51—Left magnetic isolation sleeve, 6—Right rotor support, 61—Left rotor support, 611—Left rotor support outer cylinder, 612—Left rotor support web, 7—Right magnet, 71—Left magnet, 8—Magnetic pole lamination, 9—Magnetic pole mounting slot, 10—Magnetic pole reinforcing key mounting hole, 11—Magnetic pole baffle, 12—Magnetic pole mounting positioning hole, 13—Nut, 14—Magnetic isolation end plate fan. Detailed Implementation

[0030] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments:

[0031] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0032] Example 1:

[0033] A high-voltage dual-rotor magnetic circuit structure is used in a 1000KW, 10KV large high-voltage variable frequency low-speed high-torque permanent magnet synchronous motor. The rotor has a length-to-diameter ratio of 15. A right rotor support 6, a magnetic isolation spacer 2, and a left rotor support 61 are sleeved on the outer cylindrical surface of the rotor shaft 1 from right to left. The magnetic isolation spacer 2 is the middle ring in claim 1. The right rotor support 6 and the left rotor support 61 have the same structure. Taking the left rotor support 61 as an example, the outer cylinder 611 of the left rotor support is fixed to the rotor shaft 1 by the web plate 612 of the left rotor support. On the outer cylindrical surface of the sub-rotor shaft 1, and restricted by a flat key, its relative rotation with the rotor shaft 1 is achieved. The right rotor support 6, the magnetic isolation partition plate 2, and the left rotor support 61 are tightly abutted together. Each rotor support is fitted with a magnetic isolation sleeve, i.e., the left rotor support 61 is fitted with a left magnetic isolation sleeve 51, and the right rotor support 6 is fitted with a right magnetic isolation sleeve 5. A magnetic pole iron 3 is installed on the outer cylindrical surface of each magnetic isolation sleeve. A magnet mounting groove 9 is provided between adjacent magnetic pole iron cores 3, and a magnet is fixed in the magnet mounting groove 9. The left rotor magnet 71 is fixed in the left rotor magnet mounting slot 9, and the right rotor magnet 71 is fixed in the right rotor magnet mounting slot 9. The magnetic shielding sleeve is divided into an inner magnetic shielding layer and an outer fixing layer. The inner magnetic shielding layer is made of aluminum alloy, and the outer fixing layer is made of magnetostrictive material. The magnetic pole core 3 is formed by stacking several magnetic pole laminations 8. The magnetic pole laminations 8 have a fixing through hole in the middle, namely the magnetic pole reinforcing key mounting hole 10. The corresponding magnetic pole laminations 8 on the left and right magnetic shielding sleeves 51 are pressed together by a magnetic pole reinforcing key 4. The magnetic pole lamination 8 is fan-shaped, and the inner edge of the magnetic pole lamination 8 is provided with a dovetail protrusion. The outer fixing layer of the left magnetic shielding sleeve 51 and the right magnetic shielding sleeve 5 are both provided with dovetail grooves, and the size and shape are exactly the same and correspond one to one. The magnetic pole lamination 8 is fixed in the dovetail groove through the dovetail protrusion. The magnetic shielding spacer 2 is provided with corresponding through holes for connecting the magnet. The magnetic pole core 3 is fixed with a rotor fan. The rotor fan includes a magnetic shielding end plate and a fan blade. The magnetic shielding end plate and the fan blade are an integral L-shaped structure and are made by compact casting.

[0034] Example 2:

[0035] A high-voltage dual-rotor magnetic circuit structure is used in a 1300KW, 10KV large high-voltage variable frequency low-speed high-torque permanent magnet synchronous motor. The rotor has a length-to-diameter ratio of 18. A right rotor support 6, a magnetic isolation spacer 2, and a left rotor support 61 are fitted from right to left on the outer cylindrical surface of the rotor shaft 1. The magnetic isolation spacer 2 is the middle ring in claim 1. The right rotor support 6 and the left rotor support 61 have the same structure. Taking the left rotor support 61 as an example, the outer cylinder 611 of the left rotor support is fixed to the outer cylindrical surface of the rotor shaft 1 by the web plate 612 of the left rotor support. The relative rotation between the rotor and rotor shaft 1 is restricted by a flat key. The right rotor support 6, the magnetic isolation partition 2, and the left rotor support 61 are tightly packed together. Each rotor support is fitted with a magnetic isolation sleeve, that is, the left rotor support 61 is fitted with a left magnetic isolation sleeve 51, and the right rotor support 6 is fitted with a right magnetic isolation sleeve 5. A magnetic pole core 3 is installed on the outer cylindrical surface of each magnetic isolation sleeve. A magnet mounting groove 9 is provided between adjacent magnetic pole cores 3. A magnet is fixed in the magnet mounting groove 9. A left magnet is fixed in the magnet mounting groove 9 of the left rotor. Magnet 71, the right magnet is fixed in the right rotor magnet mounting groove 9. The magnetic shielding sleeve is divided into an inner magnetic shielding layer and an outer fixing layer. The inner magnetic shielding layer is made of aluminum alloy, and the outer fixing layer is made of magnetostrictive material. The magnetic pole core 3 is formed by stacking several magnetic pole laminations 8. The magnetic pole laminations 8 have a fixing through hole in the middle, namely the magnetic pole reinforcing key mounting hole 10. The corresponding magnetic pole laminations 8 on the left magnetic shielding sleeve 51 and the right magnetic shielding sleeve 5 are pressed together by a magnetic pole reinforcing key 4. The magnetic pole laminations 8 are fan-shaped, and the inner edge of the magnetic pole laminations 8 has a dovetail protrusion. The left magnetic shielding... Both the magnetic sleeve 51 and the right magnetic shielding sleeve 5 have dovetail grooves on their outer fixing layers, and the dimensions and shapes are exactly the same and correspond one-to-one. The magnetic pole piece 8 is fixed in the dovetail groove by the dovetail protrusion. The magnetic shielding spacer 2 has corresponding through holes for connecting the magnet. The through holes have the same cross-sectional shape as the magnet, and the through hole shape is 0.1 mm larger than the corresponding dimension of the magnet cross-section. The magnetic pole core 3 is fixed with a rotor fan. The rotor fan includes a magnetic shielding end plate and fan blades. The magnetic shielding end plate and fan blades are an integral L-shaped structure, which is made of sheet metal.

[0036] Example 3:

[0037] A high-voltage dual-rotor magnetic circuit structure is used in a 900KW, 10KV large high-voltage variable frequency low-speed high-torque permanent magnet synchronous motor. The rotor has a length-to-diameter ratio of 13. A right rotor support 6, a magnetic isolation spacer 2, and a left rotor support 61 are fitted from right to left on the outer cylindrical surface of the rotor shaft 1. The magnetic isolation spacer 2 is the middle ring in claim 1. The right rotor support 6 and the left rotor support 61 have the same structure. Taking the left rotor support 61 as an example, the outer cylinder 611 of the left rotor support is fixed to the outer cylindrical surface of the rotor shaft 1 by the web plate 612 of the left rotor support, and its rotation is restricted by a flat key. The spindle shaft 1 rotates relative to the rotor shaft 1. The right rotor support 6, the magnetic isolation partition 2, and the left rotor support 61 are tightly pressed together. Each rotor support is fitted with a magnetic isolation sleeve, that is, the left rotor support 61 is fitted with a left magnetic isolation sleeve 51, and the right rotor support 6 is fitted with a right magnetic isolation sleeve 5. A magnetic pole 3 is installed on the outer cylindrical surface of each magnetic isolation sleeve. A rectangular magnet mounting groove 9 is provided between adjacent magnetic pole cores 3. A magnet is fixed in the magnet mounting groove 9. A magnet baffle 11 is provided at the outer cylindrical end of the magnet mounting groove 9 to prevent the magnet from falling out of the magnet mounting groove 9. The left rotor magnet 71 is fixed in the left rotor magnet mounting slot 9, and the right rotor magnet 71 is fixed in the right rotor magnet mounting slot 9. The magnetic shielding sleeve is divided into an inner magnetic shielding layer and an outer fixing layer. The inner magnetic shielding layer is made of aluminum alloy, and the outer fixing layer is made of magnetostrictive material. The magnetic pole core 3 is formed by stacking several magnetic pole laminations 8. The magnetic pole laminations 8 have a fixing through hole in the middle, namely the magnetic pole reinforcing key mounting hole 10. The corresponding magnetic pole laminations 8 on the left and right magnetic shielding sleeves 51 are pressed together by a magnetic pole reinforcing key 4. The magnetic pole laminations 8 are fan-shaped, and the inner circular edge of the magnetic pole laminations 8 is... The magnetic pole pieces are provided with dovetail protrusions. The outer fixing layers of the left and right magnetic shielding sleeves 51 and 5 are provided with dovetail grooves, which are exactly the same in size and shape and correspond one to one. The magnetic pole pieces 8 are fixed in the dovetail grooves through the dovetail protrusions. The magnetic shielding spacer 2 is provided with corresponding through holes for connecting magnets. The through holes are the same as the cross-sectional shape of the magnets. The through hole shape is 0.08 mm larger than the corresponding size of the cross-sectional shape of the magnets. A rotor fan is fixed on the magnetic pole core 3. The rotor fan includes a magnetic shielding end plate and fan blades. The magnetic shielding end plate and fan blades are integral L-shaped structures and are made of sheet metal.

[0038] The foregoing has broadly outlined some aspects and features of the various embodiments and should be interpreted as merely illustrative of potential applications. Other beneficial results can be obtained by applying the disclosed information in different ways or by combining aspects of the disclosed embodiments. Further aspects and a more complete understanding can be obtained based on the detailed description of exemplary embodiments with reference to the accompanying drawings, within the scope defined by the claims.

[0039] In addition to the above embodiments, the present invention also discloses the following technical solutions:

[0040] Option 1:

[0041] A rotor fan is fixed on the magnetic pole core 3. The rotor fan includes a magnetic shielding end plate and fan blades. The magnetic shielding end plate and fan blades are integral L-shaped structures. The magnetic shielding end plate is provided with through holes. The through holes are sleeved on both ends of the magnetic pole reinforcing key 4 and fixed to the end of the magnetic pole reinforcing key with nuts 13. The circumferential dimension of the magnetic shielding end plate is larger than the dimension of the magnetic pole lamination 8. The part larger than the magnetic pole lamination 8 is used to block the magnet from moving axially along the rotor.

[0042] Option 2:

[0043] A rectangular magnet mounting groove 9 is provided between adjacent magnetic pole cores 3. A magnet is fixed in the magnet mounting groove 9. A magnet baffle 11 is provided at the outer cylindrical end of the magnet mounting groove 9 to prevent the magnet from being thrown out of the magnet mounting groove 9. The magnet baffle 11 is a split structure and is respectively set on both sides of the diameter direction of the fan-shaped annular structure of the two adjacent magnetic pole pieces 8, and close to the outer edge.

[0044] Option 3:

[0045] A rectangular magnet mounting groove 9 is provided between adjacent magnetic pole cores 3. A magnet is fixed in the magnet mounting groove 9. A magnet baffle 11 is provided at the outer cylindrical end of the magnet mounting groove 9 to prevent the magnet from being thrown out of the magnet mounting groove 9. The magnet baffle 11 is an integral structure. Slots are provided on both sides of the fan-shaped annular structure of the adjacent magnetic pole blanks 8 in the diameter direction and near the outer edge. The magnet baffle 11 is inserted into the slots.

[0046] The above embodiments provide a detailed description of the present invention. Of course, the above description is not intended to limit the present invention, nor is the present invention limited to the examples described above. Any changes, modifications, additions, reductions, or substitutions made by those skilled in the art within the scope of the present invention are also within the protection scope of the present invention.

Claims

1. A high-voltage dual-rotor magnetic circuit structure, characterized in that, This motor is used for 710-1500KW, 10KV large high-voltage variable frequency low-speed high-torque permanent magnet synchronous motors. The rotor's length-to-diameter ratio is ≥11 and ≤20. The rotor includes a shaft, rotor support, magnetic shielding sleeve, middle ring, magnetic pole core, and magnets. The middle ring is a magnetic shielding spacer plate with corresponding through holes for connecting the magnets. A right rotor support, magnetic shielding spacer plate, and left rotor support are fitted from right to left on the outer cylindrical surface of the rotor shaft. The right and left rotor supports have identical structures. The outer cylinder of the left rotor support is fixed to the outer cylindrical surface of the rotor shaft by the web of the left rotor support, and its relative rotation with the rotor shaft is restricted by a flat key. The right rotor support, the magnetic shielding spacer, and the left rotor support are closely packed together. Each rotor support is fitted with a magnetic shielding sleeve, i.e., the left rotor support is fitted with a left magnetic shielding sleeve, and the right rotor support is fitted with a right magnetic shielding sleeve. A magnetic pole core is installed on the outer cylindrical surface of each magnetic shielding sleeve. A rectangular magnet mounting groove is provided between adjacent magnetic pole cores. A magnet is fixed in the magnet mounting groove. A magnet baffle is provided at the outer cylindrical end of the magnet mounting groove to prevent the magnet from being thrown out of the magnet mounting groove. The left magnet is fixed in the magnet mounting groove of the left rotor, and the right magnet is fixed in the magnet mounting groove of the right rotor. The magnetic shielding sleeve is divided into an inner magnetic shielding layer and an outer fixing layer. The outer fixing layer is made of magnetostrictive material.

2. The high-voltage dual-rotor magnetic circuit structure according to claim 1, characterized in that, The magnetic pole core is formed by stacking several magnetic pole laminations.

3. The high-voltage dual-rotor magnetic circuit structure according to claim 2, characterized in that, The magnetic pole piece has a fixed through hole in the middle, and the corresponding magnetic pole pieces on the two magnetic shielding sleeves are pressed together by a magnetic pole reinforcing key.

4. The high-voltage dual-rotor magnetic circuit structure according to claim 3, characterized in that, The magnetic pole piece is fan-shaped.

5. The high-voltage dual-rotor magnetic circuit structure according to claim 4, characterized in that, The inner edge of the magnetic pole piece is provided with a dovetail protrusion, and the outer fixing layer of the magnetic shielding sleeve is provided with a dovetail groove, and the dovetail protrusion is fixed in the dovetail groove.

6. The high-voltage dual-rotor magnetic circuit structure according to claim 1, characterized in that, The through hole has the same cross-sectional shape as the magnet, but the through hole is 0.1 mm larger than the corresponding cross-sectional shape of the magnet.

7. A high-voltage dual-rotor magnetic circuit structure according to any one of claims 1-5, characterized in that, A rotor fan is fixed on the magnetic pole core.

8. The high-voltage dual-rotor magnetic circuit structure according to claim 7, characterized in that, The rotor fan includes a magnetic shielding end plate and fan blades, and the magnetic shielding end plate and fan blades are an integral L-shaped structure.

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