Rotor topological structure of semi-direct-drive permanent magnet wind driven generator

Abstract

The invention discloses a rotor topological structure of a semi-direct-drive permanent magnet wind driven generator, which relates to the field of wind power generation, and comprises a magnetic pole box iron core, a plurality of magnetic poles are uniformly divided along the circumferential direction, the magnetic poles are symmetrically arranged based on a center line, the magnetic poles are provided with V-shaped symmetrical magnet grooves, permanent magnets are fixed in the magnet grooves, and the polarities of the permanent magnets on the adjacent magnetic poles are opposite; two ends of the magnet groove are provided with symmetrical magnet holes, and contact positions of the magnet holes and the permanent magnets are provided with blocking tables; chamfers are arranged at the bottom turning parts of the magnet holes; a non-magnetic baffle is arranged between the permanent magnet and the magnet hole; a first magnetic isolation bridge and an auxiliary hole are arranged between adjacent magnet grooves; third magnet holes are formed in the bent edges of the two sides of the magnetic pole, and magnetic isolation bridges are arranged between the edges; according to the permanent magnet motor, the effects that the difference between a direct-axis magnetic circuit and a quadrature-axis magnetic circuit is increased, the salient pole rate is improved, the reluctance torque is fully utilized, the output torque and efficiency of the motor are improved, the using amount of the permanent magnets is reduced, and the cost is reduced are achieved.

Description

Technical Field

[0001] This invention relates to the field of wind power generation technology, and more specifically, to a rotor topology of a semi-direct drive permanent magnet wind turbine. Background Technology

[0002] Semi-direct drive permanent magnet wind power generation technology is a wind power generation technology between direct drive and doubly-fed induction generators. It simplifies the traditional drive method, eliminates some transmission links, and converts wind energy into electrical energy through a permanent magnet synchronous generator. This technology combines the advantages of low maintenance costs of direct drive technology and high-efficiency transmission of doubly-fed induction generators. Currently, cost pressures are increasing in the wind turbine industry, therefore, generator design needs to improve material utilization, reduce costs, and enhance market competitiveness.

[0003] Existing semi-direct drive permanent magnet generators mostly use a "I"-shaped pole structure. While this structure is simple and stable, its magnetic circuit structure is relatively simple, making further performance improvements difficult. Furthermore, it lacks magnetization, resulting in low reluctance torque utilization and problems such as excessive magnetic circuit symmetry and insufficient difference in inductance between the direct and quadrature axes, leading to a saliency ratio (Lq / Ld) generally below 1.5. This directly affects the generator's reluctance torque utilization, causing a power density decrease of approximately 15-20%.

[0004] In summary, how to improve the utilization rate of magnet materials, rationally arrange rotor space, increase reluctance torque and power density, and reduce costs are problems that urgently need to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a rotor topology for a semi-direct drive permanent magnet wind turbine generator, which effectively increases the difference between the direct-axis and quadrature-axis magnetic circuits, improves the saliency ratio, makes full use of the generator's magnetic reluctance torque, improves the motor's output torque and efficiency, reduces the amount of permanent magnets used, and lowers costs.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A rotor topology for a semi-direct-drive permanent magnet wind turbine includes:

[0008] The magnetic pole box core is divided into several magnetic poles evenly along the circumference. The multiple magnetic poles are arranged symmetrically based on the center line, and each magnetic pole is provided with a pair of magnetic slots that are V-shaped symmetrical based on the center line.

[0009] A permanent magnet is fixedly disposed in the corresponding magnet slot, and at least one permanent magnet is disposed in each magnet slot. The permanent magnets on adjacent magnetic poles have opposite polarities.

[0010] Preferably, each of the magnet slots has a first magnet hole and a second magnet hole at both ends, and is symmetrical about the centerline;

[0011] Each of the first magnet holes is provided with a first baffle at the contact position between the first magnet hole and the corresponding permanent magnet;

[0012] A second baffle is provided at the contact position between each of the second magnet holes and the corresponding permanent magnet.

[0013] Preferably, each of the contact positions between the first magnet hole and the corresponding permanent magnet is provided with two first baffles, which are symmetrically distributed on the upper and lower sides;

[0014] Two second baffles are provided at the contact positions between each second magnet hole and the corresponding permanent magnet, and they are symmetrically distributed on the upper and lower sides.

[0015] Preferably, each of the first magnet holes and each of the second magnet holes has a chamfered structure at the bottom bend to reduce stress concentration.

[0016] Preferably, a first baffle is provided between each permanent magnet and the corresponding first magnet hole, and a second baffle is provided between each permanent magnet and the corresponding second magnet hole;

[0017] Both the first baffle and the second baffle are made of non-magnetic materials.

[0018] Preferably, a first magnetic isolation bridge is provided between two adjacent magnet slots;

[0019] The rotor topology also includes auxiliary holes, which are disposed above the first magnetic isolation bridge, and at least one auxiliary hole is disposed on each magnetic pole.

[0020] Preferably, each of the magnetic poles has a third magnet hole on both sides of the bent edge;

[0021] The bent edge of each magnetic pole is arranged parallel to the bent edge of the adjacent first magnet hole.

[0022] Preferably, a second magnetic isolation bridge is provided between the bent edge of each magnetic pole and the bent edge of the adjacent first magnet hole.

[0023] Preferably, the upper edge of each magnetic pole is arranged parallel to the upper edge of the adjacent first magnet hole;

[0024] A third magnetic isolation bridge is provided between the upper edge of each magnetic pole and the upper edge of the adjacent first magnet hole.

[0025] Preferably, each of the magnetic poles is provided with a pair of square holes symmetrical about the centerline below the magnet slot, and each of the square holes is provided with a screw to tighten and fix the iron core of the magnetic pole box.

[0026] The rotor topology of the semi-direct drive permanent magnet wind turbine provided by this invention changes the arrangement of permanent magnets, symmetrically arranging them in a V-shape within the magnet slots. This effectively increases the difference between the direct-axis and quadrature-axis magnetic circuits, improves the saliency ratio, and allows the motor to better utilize reluctance torque. This, combined with the permanent magnet torque, improves the motor's output torque and efficiency, generating more electrical energy under the same wind conditions, increasing wind energy conversion efficiency, and reducing the cost per unit of electricity. At the same time, it can reduce the amount of permanent magnets used while meeting the same power output requirements, thus reducing the motor's manufacturing cost.

[0027] The further solutions provided in this application can also achieve at least one of the following beneficial technical effects:

[0028] By setting a chamfer structure at the bottom bend of the magnet hole, stress concentration is effectively reduced;

[0029] The permanent magnet is effectively protected by the first and second baffles, preventing it from being directly squeezed.

[0030] By setting an auxiliary hole above the first magnetic bridge, the saliency rate and power angle are effectively improved, while the weight is effectively reduced and ventilation is provided. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the rotor structure in this embodiment;

[0033] Figure 2 This is a dimensioned diagram of the rotor structure in this embodiment;

[0034] Figure 3 This is a schematic diagram comparing the saliency of this application with that of the prior art.

[0035] Figures 1-3 In the accompanying drawings, the reference numerals include:

[0036] 101. Magnetic pole box core; 102. Permanent magnet; 103. Magnet slot; 104. First baffle; 105. Second baffle; 106. First magnet hole; 107. Second magnet hole; 108. Square hole; 109. Third magnet hole; 110. Auxiliary hole;

[0037] 201. Upper edge of the magnetic pole; 202. Upper edge of the magnet hole; 203. Bending edge of the magnetic pole; 204. Bending edge of the magnet hole. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship can also change accordingly. This application discloses a rotor topology structure for a semi-direct-drive permanent magnet wind turbine.

[0040] The core of this invention is to provide a rotor topology for a semi-direct drive permanent magnet wind turbine.

[0041] Please refer to Figure 1 .

[0042] The rotor topology of the semi-direct drive permanent magnet wind turbine provided by this invention includes a pole box core 101 and permanent magnets 102. The pole box core 101 is evenly divided into several magnetic poles along the circumference, and the multiple magnetic poles are symmetrically arranged based on the centerline. Each magnetic pole is provided with a pair of magnet slots 103 that are V-shaped symmetrical based on the centerline. The permanent magnets 102 are fixedly disposed in the corresponding magnet slots 103, and at least one permanent magnet 102 is disposed in each magnet slot 103. The permanent magnets 102 on adjacent magnetic poles have opposite polarities.

[0043] Specifically, the magnetic pole box core 101 is evenly divided into several magnetic poles along the circumference. The magnetic poles are arranged symmetrically based on the center line (d-axis), and each magnetic pole is provided with a pair of magnetic slots 103 that are V-shaped symmetrical based on the center line (d-axis). Figure 1 As shown, the magnet slot 103 can be a rectangular slot arranged at an angle. Each magnet slot 103 is equipped with a permanent magnet 102. The number of permanent magnets 102 located in the magnet slot 103 can be one or more. The shape and polarity of each permanent magnet 102 are the same, while the polarities of permanent magnets 102 in adjacent magnetic poles are opposite.

[0044] Optionally, the permanent magnet 102 and the magnet slot 103 are glued together to ensure that the permanent magnet 102 will not be displaced during motor operation.

[0045] It should be noted that the combined electromagnetic torque of a semi-direct drive permanent magnet wind turbine consists of reluctance torque and permanent magnet torque. The combined torque T em It can be calculated using the following formula:

[0046]

[0047] In the formula I d I q For direct-axis current and quadrature-axis current (A);

[0048] L d L q For direct-axis inductance and quadrature-axis inductance (H);

[0049] T em The electromagnetic torque is (Nm).

[0050] p is the pole pair number;

[0051] The amplitude of the fundamental wave of the unloaded permanent magnet flux linkage (Wb).

[0052] In the formula, the first part of the electromagnetic torque formula represents the electromagnetic torque, which is proportional to the product of the fundamental amplitude of the permanent magnet flux linkage and the quadrature-axis current; while the second part represents the reluctance torque, which is generated by the salient pole effect and is proportional to the product of the difference between the direct and quadrature-axis inductances, the direct-axis current, and the quadrature-axis current. The ratio of permanent magnet torque to reluctance torque at different magnetic poles can reflect the utilization rate of the permanent magnet and rotor laminations.

[0053] In this application, by employing a V-shaped magnetic pole design and altering the arrangement of permanent magnets, the difference between the direct-axis and quadrature-axis magnetic circuits can be effectively increased. In the V-shaped structure, the permanent magnets 102 are arranged in a V-shape. This arrangement results in relatively high reluctance and low permeability of the permanent magnets 102 in the d-axis magnetic circuit, while in the q-axis magnetic circuit, due to the distribution of the permanent magnets and the direction of the magnetic circuit, the reluctance is relatively low and the permeability is high. Since reactance is proportional to permeability, this increases the difference between the direct-axis and quadrature-axis reluctance, thereby improving the salient pole ratio.

[0054] The increased saliency ratio allows the motor to better utilize reluctance torque, which works in conjunction with permanent magnet torque to improve the motor's output torque and efficiency. In semi-direct drive permanent magnet wind turbines, increased efficiency means more electricity can be generated under the same wind conditions, improving wind energy conversion efficiency and reducing the cost per kilowatt-hour. Furthermore, since reluctance torque can be used to assist output torque, the amount of permanent magnets can be appropriately reduced while maintaining the same power output, effectively lowering the motor's manufacturing cost.

[0055] like Figure 3 As shown, the saliency of the prior art is 1.07, while the saliency of the present invention is 1.72, which is 60.7% higher. With proper arrangement, the amount of magnets used is reduced by more than 10% under the same output power, and the improvement effect is significant.

[0056] The rotor topology of the aforementioned semi-direct drive permanent magnet wind turbine generator, by changing the arrangement of the permanent magnets 102, arranges the permanent magnets 102 in a V-shape symmetrical arrangement within the magnet slots 103, effectively increasing the difference between the direct-axis and quadrature-axis magnetic circuits, improving the saliency ratio, and enabling the motor to better utilize reluctance torque. This, together with the permanent magnet torque, improves the motor's output torque and efficiency, generating more electrical energy under the same wind conditions, improving wind energy conversion efficiency, and reducing the unit cost per kilowatt-hour. At the same time, it can reduce the amount of permanent magnets used while meeting the same power output requirements, thus reducing the motor's manufacturing cost.

[0057] The rotor topology of the semi-direct drive permanent magnet wind turbine provided by the present invention will be described in more detail below with reference to the accompanying drawings and specific embodiments.

[0058] In one specific implementation, reference is made to... Figures 1 to 2 Each magnet slot 103 has a first magnet hole 106 and a second magnet hole 107 at both ends, and is symmetrical about the center line; a first baffle is provided at the contact position between each first magnet hole 106 and the corresponding permanent magnet 102; a second baffle is provided at the contact position between each second magnet hole 107 and the corresponding permanent magnet 102.

[0059] Furthermore, each first magnet hole 106 has two first baffles at its contact position with the corresponding permanent magnet 102, which are symmetrically distributed on the upper and lower sides; each second magnet hole 107 has two second baffles at its contact position with the corresponding permanent magnet 102, which are symmetrically distributed on the upper and lower sides.

[0060] Specifically, a first magnet hole 106 and a second magnet hole 107 are respectively provided on both sides of each magnet slot 103, and are symmetrical about the center line (d-axis). The contact position between each first magnet hole 106 and the permanent magnet 102 is provided with a first baffle on both the upper and lower sides, wherein the heights of the two first baffles are L6 and L7 (e.g., Figure 2 As shown in the figure, each contact position between the second magnet hole 107 and the permanent magnet 102 is provided with a second baffle on both the upper and lower sides, wherein the heights of the two second baffles are L9 and L1, respectively. 10 .

[0061] It should be noted that the first and second stops are not labeled in the diagram, but can be identified through... Figure 2 The L6, L7, L9 and L in the middle are marked 10 The placement and height of the first and second baffles are clearly visible. This symmetrical baffle structure can more effectively fix the permanent magnet 102 and improve its stability.

[0062] Based on any of the above embodiments, refer to Figure 1 and Figure 2 Each first magnet hole 106 and each second magnet hole 107 has a chamfered structure at the bottom bend to reduce stress concentration.

[0063] Specifically, the first magnet hole 106 and the second magnet hole 107 are irregularly shaped. Chamfers R2 and R3 are respectively provided at the bottom bend edges of the first magnet hole 106 and the second magnet hole 107. During motor operation, the magnet holes are subjected to magnetic and mechanical forces. If there is no chamfer at the bottom bend, stress concentration can easily occur, leading to damage to the magnet holes. The chamfer structure can be a rounded chamfer or an angled chamfer, and the specific chamfer dimensions can be designed according to the size of the magnet hole and the stress conditions.

[0064] Based on any of the above embodiments, refer to Figure 1 Each permanent magnet 102 is provided with a first baffle 104 between itself and the corresponding first magnet hole 106, and each permanent magnet 102 is provided with a second baffle 105 between itself and the corresponding second magnet hole 107; both the first baffle 104 and the second baffle 105 are made of non-magnetic material.

[0065] Specifically, a first baffle 104 is provided between the permanent magnet 102 and the first magnet hole 106, and a second baffle 105 is provided between the permanent magnet 102 and the second magnet hole 106. The thickness of the first baffle 104 is L5, and the thickness of the second baffle 105 is L8. The thickness of the baffles can be adjusted according to actual needs. The first baffle 104 and the second baffle 105 are non-magnetic baffles (specifically, stainless steel plates can be selected) to isolate the permanent magnet 102, which can effectively protect the permanent magnet 102 and prevent the permanent magnet 102 from being directly squeezed.

[0066] Based on any of the above embodiments, refer to Figures 1 to 3Each magnetic pole has a third magnet hole 109 on both sides of the bent edge; the bent edge of each magnetic pole is arranged parallel to the bent edge of the adjacent first magnet hole 106.

[0067] Furthermore, a second magnetic isolation bridge is provided between the bent edge of each magnetic pole and the bent edge of the adjacent first magnet hole 106.

[0068] Specifically, the two bent edges of the magnetic pole are called magnetic pole bent edges 203, and the bent edge of the first magnet hole 106 is called magnet hole bent edge 204. The magnetic pole bent edges 203 and magnet hole bent edges 204 are arranged parallel to each other, such as... Figure 1 As shown, the two sides of the magnetic pole are the q-axis, and there is an angle between the bent edge 203 of the magnetic pole and the q-axis. A third magnet hole 109 is formed between the magnetic pole bending edge 203 and the q axis, which can effectively improve the saliency rate and power angle, and is also beneficial for weight reduction and improved ventilation.

[0069] There is a second magnetic isolation bridge between the magnetic pole bending edge 203 and the magnet hole bending edge 204, and the width of the second magnetic isolation bridge is L3.

[0070] Based on any of the above embodiments, refer to Figure 2 The upper edge of each magnetic pole is arranged parallel to the upper edge of the adjacent first magnet hole 106; a third magnetic isolation bridge is provided between the upper edge of each magnetic pole and the upper edge of the adjacent first magnet hole 106.

[0071] Specifically, the upper edge of the magnetic pole is the upper edge 201, and the upper edge of the first magnet hole 106 is the upper edge 202. The upper edge 201 and the upper edge 202 of the magnet hole are arranged parallel to each other. Figure 3 As shown, a third magnetic isolation bridge is provided between the upper edge 201 of the magnetic pole and the upper edge 202 of the magnet hole, and the width of the third magnetic isolation bridge is L4.

[0072] It should be noted that the function of the second and third magnetic isolation bridges is to reduce magnetic coupling between installation positions, reduce magnetic leakage, and improve the independence of the magnetic circuit. The widths of the second and third magnetic isolation bridges can be designed according to the size of the magnet hole and the requirements of the magnetic poles.

[0073] Based on any of the above embodiments, such as Figure 2 As shown, a first magnetic isolation bridge is provided between two adjacent magnet slots 103; the rotor topology also includes an auxiliary hole 110, which is located above the first magnetic isolation bridge, and at least one auxiliary hole 110 is provided on each magnetic pole.

[0074] Specifically, such as Figure 2As shown, the width of the first magnetic isolation bridge is L2, the thickness of the permanent magnet 102 is L1, the included angle formed between adjacent magnet slots 103 is α, and an auxiliary hole 110 is provided above the first magnetic isolation bridge to improve the saliency rate, reduce weight and provide ventilation. One or more auxiliary holes 110 can be provided, with different shapes, and the radius of the auxiliary hole 110 is R1.

[0075] The first magnetic isolation bridge serves the same purpose as the second and third magnetic isolation bridges: effectively reducing magnetic coupling between adjacent magnet slots 103, minimizing magnetic leakage, and improving the independence of the magnetic circuit. The width of the first magnetic isolation bridge can be designed according to the size of the magnet slot 103 and the requirements of the magnetic circuit.

[0076] Auxiliary holes serve multiple functions. They can improve saliency ratio; by adjusting the size and shape of the auxiliary holes, the magnetic circuit distribution can be altered, thereby increasing the saliency ratio. Auxiliary holes also contribute to weight reduction, decreasing the motor's weight and moment of inertia. Furthermore, they facilitate ventilation and heat dissipation, improving the motor's cooling efficiency. The shapes of auxiliary holes can be circular, elliptical, rectangular, etc., and the specific shape and number can be selected based on the motor's design requirements.

[0077] Based on any of the above embodiments, please refer to Figure 1 and Figure 2 Each magnetic pole is provided with a pair of square holes 108 symmetrical about the centerline below the magnet slot 103. Each square hole 108 is provided with a screw to tighten and fix the magnetic pole box core 101.

[0078] Specifically, the magnetic poles are located below the magnet slot 103 and have symmetrically arranged square holes 108 relative to the center line. The length and width of the square holes 108 are L and L respectively. 12 and L 13 Each square hole 108 is equipped with a screw to tighten and fix the magnetic pole box core 101. The square holes 108 and screws can enhance the overall structural strength of the magnetic pole box core 101 and prevent the magnetic poles from loosening or deforming during motor operation.

[0079] The implementation principle of the rotor topology of a semi-direct drive permanent magnet wind turbine according to an embodiment of this application is as follows: By arranging permanent magnets 102 using a V-shaped magnet slot 103 structure, the present invention effectively increases the difference between the direct-axis and quadrature-axis magnetic circuits, improves the saliency ratio, and enables the motor to fully utilize the reluctance torque, which works in conjunction with the permanent magnet torque to improve the output torque and efficiency of the motor. Under the same wind conditions, more electrical energy can be generated, improving the wind energy conversion efficiency and reducing the unit cost per kilowatt-hour. At the same time, since the reluctance torque can be used to assist the output torque, the amount of permanent magnets can be appropriately reduced while meeting the same power output requirements. The cost of permanent magnets 102 is relatively high, and reducing the amount of permanent magnets 102 can effectively reduce the manufacturing cost of the motor. In addition, by setting up baffles, magnetic bridges, auxiliary holes 110, square holes 108, and other structures, the magnetic circuit distribution is further optimized, the leakage magnetic phenomenon is reduced, the stability and reliability of the motor are improved, the rotor space is fully utilized, and the magnets are arranged in a reasonable manner, solving many problems existing in the prior art and making significant improvements and contributions to the prior art.

[0080] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0081] The rotor topology of a semi-direct-drive permanent magnet wind turbine provided by this invention has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this invention. It should be noted that those skilled in the art can make several improvements and modifications to this invention without departing from the principles of this invention, and these improvements and modifications also fall within the protection scope of this invention.

Claims

1. A rotor topology for a semi-direct-drive permanent magnet wind turbine, characterized in that, include: The magnetic pole box core (101) is divided into several magnetic poles along the circumference. The multiple magnetic poles are arranged symmetrically based on the center line. Each magnetic pole is provided with a pair of magnetic slots (103) that are V-shaped symmetrical based on the center line. A permanent magnet (102) is fixedly disposed in the corresponding magnet slot (103), and at least one permanent magnet (102) is disposed in each magnet slot (103), and the permanent magnets (102) on adjacent magnetic poles have opposite polarities.

2. The rotor topology of a semi-direct drive permanent magnet wind turbine generator according to claim 1, characterized in that, Each of the magnet slots (103) is provided with a first magnet hole (106) and a second magnet hole (107) at both ends, and is symmetrical about the center line; Each of the first magnet holes (106) is provided with a first baffle at the contact position with the corresponding permanent magnet (102); Each of the second magnet holes (107) has a second baffle at the contact position with the corresponding permanent magnet (102).

3. The rotor topology of a semi-direct drive permanent magnet wind turbine generator according to claim 2, characterized in that, Two first baffles are provided at the contact positions between each of the first magnet holes (106) and the corresponding permanent magnets (102), and they are symmetrically distributed on the upper and lower sides; Each of the second magnet holes (107) and the corresponding permanent magnet (102) has two second baffles at their contact positions, which are symmetrically distributed on the upper and lower sides.

4. The rotor topology of a semi-direct drive permanent magnet wind turbine generator according to claim 2, characterized in that, Each of the first magnet holes (106) and each of the second magnet holes (107) has a chamfered structure at the bottom bend to reduce stress concentration.

5. The rotor topology of a semi-direct drive permanent magnet wind turbine generator according to claim 2, characterized in that, A first baffle (104) is provided between each of the permanent magnets (102) and the corresponding first magnet hole (106), and a second baffle (105) is provided between each of the permanent magnets (102) and the corresponding second magnet hole (107). Both the first baffle (104) and the second baffle (105) are made of non-magnetic materials.

6. The rotor topology of a semi-direct drive permanent magnet wind turbine generator according to claim 1, characterized in that, A first magnetic isolation bridge is provided between two adjacent magnet slots (103); The rotor topology also includes an auxiliary hole (110), which is disposed above the first magnetic isolation bridge, and at least one auxiliary hole (110) is disposed on each magnetic pole.

7. The rotor topology of a semi-direct drive permanent magnet wind turbine generator according to claim 2, characterized in that, Each of the magnetic poles has a third magnet hole (109) on both sides of the bent edge. The bent edge of each magnetic pole is arranged parallel to the bent edge of the adjacent first magnet hole (106).

8. The rotor topology of a semi-direct drive permanent magnet wind turbine generator according to claim 7, characterized in that, A second magnetic bridge is provided between the bent edge of each magnetic pole and the bent edge of the adjacent first magnet hole (106).

9. The rotor topology of a semi-direct drive permanent magnet wind turbine generator according to claim 7, characterized in that, The upper edge of each of the magnetic poles is arranged parallel to the upper edge of the adjacent first magnet hole (106); A third magnetic isolation bridge is provided between the upper edge of each magnetic pole and the upper edge of the adjacent first magnet hole (106).

10. The rotor topology of a semi-direct drive permanent magnet wind turbine generator according to any one of claims 1-9, characterized in that, Each of the magnetic poles is provided with a pair of square holes (108) symmetrical about the centerline below the magnet slot (103), and each of the square holes (108) is provided with a screw to tighten and fix the iron core (101) of the magnetic pole box.

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