Wedge-shaped tooth variable cross-section winding permanent magnet arc-shaped motor

Abstract

The application provides a wedge-shaped tooth variable cross-section winding permanent magnet arc-shaped motor, and belongs to the technical field of motors. r 1, the arc-shaped outer diameter is r 2; each primary tooth adopts a wedge-shaped structure, and the primary tooth gradually increases from the arc-shaped inner diameter to the arc-shaped outer diameter direction, and the cross section of the primary slot at an arbitrary position is rectangular, and the areas of the rectangles are equal or similar; the armature winding adopts a multi-layer conductor structure, and the areas of the cross sections of all the conductors at an arbitrary position are equal. The armature winding adopts an additive manufacturing process and has a variable cross section shape. The primary slot can be internally provided with a cooling pipeline, and the shape of the primary winding can be changed according to the shape of the cooling pipeline. The secondary assembly is composed of a secondary core and a permanent magnet. The structure is beneficial to improving the slot fill factor of the winding, enhancing the winding cooling, and reducing the mass of the primary core, thereby being beneficial to improving the torque density and dynamic performance of the motor.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of electric machines, and mainly relates to a wedge-shaped tooth variable cross-section winding permanent magnet arc-shaped electric machine. BACKGROUND

[0002] High-end equipment manufacturing, intelligent factory high-speed high-precision material transmission and the like have an urgent need for high-torque force density and high-dynamic disc-type permanent magnet arc-shaped electric machines. Traditional disc-type permanent magnet arc-shaped electric machines usually adopt two kinds of slot structures, the first kind being a structure with a narrow inner diameter and a wide outer diameter, and the second kind being a rectangular structure with the same inner and outer diameters.

[0003] When the first kind of structure is adopted, since the slot heights at the inner and outer diameters are equal, the traditional winding structure is prone to have a too high slot fill factor at the inner diameter, which makes it difficult to process, and a hollow exists at the outer diameter, which causes space waste and is prone to cause a large thermal resistance to affect temperature rise, thereby limiting the improvement of the electric load and torque density of the disc-type permanent magnet arc-shaped electric machine.

[0004] When the second kind of structure is adopted, although the slot fill factor of the winding in the slot can be relatively optimally designed, the tooth width of the primary core is narrow at the inner diameter and wide at the outer diameter, and although the fan-shaped permanent magnet with a narrow inner diameter and a wide outer diameter can also be adopted for the magnetic pole structure, the primary core teeth at different positions are difficult to be all at the best working point, which to some extent causes waste of the core material and makes it difficult to optimally design the torque performance, and for the arc-shaped electric machine, when the primary core is used as a mover, the mass of the mover is increased, which affects the improvement of the dynamic performance. SUMMARY

[0005] The present application aims to solve the problem of low torque density of the traditional disc-type permanent magnet arc-shaped electric machine, and provides a wedge-shaped tooth variable cross-section winding permanent magnet arc-shaped electric machine.

[0006] The specific technical scheme of the present application is as follows:

[0007] The wedge-shaped tooth variable cross-section winding permanent magnet arc-shaped electric machine comprises a primary assembly and a secondary assembly, the primary assembly and the secondary assembly are both arc-shaped, the primary assembly comprises a primary core and an armature winding, the primary core is slotted to form a primary yoke, primary teeth and a primary slot structure, and the secondary assembly comprises a secondary core and a permanent magnet; the primary assembly and the secondary assembly are in an air gap structure; the arc-shaped inner diameter of the electric machine is r1, and the arc-shaped outer diameter is r2; each primary tooth adopts a wedge-shaped structure, the primary teeth gradually increase from the arc-shaped inner diameter to the arc-shaped outer diameter, and the cross sections of the primary slots at any positions are all rectangular, and the areas of the rectangular cross sections are equal or similar.

[0008] The armature winding adopts a multi-layer conductor structure, and the areas of the cross sections of all the conductors at any positions are equal.

[0009] The application is further designed that the armature winding is made by an additive manufacturing process.

[0010] The application is further designed that the cross-sectional shape of each layer of conductor in each armature winding is the same or different on both sides of the same primary tooth.

[0011] The application is further designed that the cross-sectional shape of each layer of conductor in the armature winding is the same or different.

[0012] The application is further designed that the cross-sectional shape of each layer of conductor in the armature winding is the same or different.

[0013] The application is further designed that the cross-sectional shape of each layer of conductor in the armature winding is the same or different.

[0014] The application is further designed that the cross-sectional shape of each layer of conductor in the armature winding is the same or different.

[0015] The application is further designed that the cross-sectional shape of each layer of conductor in the armature winding is the same or different.

[0016] The application is further designed that the cross-sectional shape of each layer of conductor in the armature winding is the same or different.

[0017] The application is further designed that the cross-sectional shape of each layer of conductor in the armature winding is the same or different.

[0018] The application has the following advantages compared with the prior art:

[0019] 1、The primary slot of the application is small in width and high in height at the arc inner diameter of the motor, and is large in width and low in height at the arc outer diameter, so as to keep the slot area at the inner and outer diameters equal or similar, and the variable cross-sectional shape design of the winding is made by the additive manufacturing. The additive manufacturing, commonly known as 3D printing, is a manufacturing technology for manufacturing solid objects by layering materials in the form of extrusion, sintering, melting, light curing and spraying. This processing technology is more suitable for forming complex structures, thereby reducing the number of parts, reducing the weight, and realizing the optimal structure and function. The additive manufacturing technology is used for the variable cross-sectional winding processing, so as to reduce the gap between the windings in the slot, thereby improving the slot fill factor of the windings in the slot. Therefore, the winding structure of the application reduces the low-thermal-conductivity gap in the slot, improves the slot utilization, and thus improves the torque density.

[0020] 2、The primary tooth of the application adopts wedge-shaped design, which can make the magnetic density on the teeth of the arc-shaped inner and outer diameters designed near the inflection point of the magnetization curve, thereby realizing optimal magnetic field distribution. On the other hand, when the arc-shaped outer diameter of the core tooth is increased, the slot width is also increased, and the slot height and tooth height are appropriately reduced, thereby reducing the space waste in the slot, reducing unnecessary core mass by reducing the tooth height, and further improving the torque density and dynamic performance. The finite element simulation results show that the winding and tooth structure design proposed in the application can increase the torque density of the motor by more than 20%.

[0021] 3、The cooling pipe of the application is arranged through the primary slot internal winding and the end winding, directly realizing the cooling of the winding, and through the flexible design of the additive manufacturing variable cross-section winding, the optimal matching with the cooling pipe is realized. Compared with the design scheme of the traditional cooling pipe in the shell and the core yoke part, this structure can realize the direct cooling of the winding where the loss accumulates the most, quickly take away the winding loss, thereby improving the cooling performance, and thereby improving the electrical load and the torque density.

[0022] 4、The winding structure proposed in the application reduces the gap between the conductors in the slot, which is beneficial to improve the slot fill rate, and the slot fill rate can reach 90%. The slot fill rate of the traditional enameled wire structure is generally below 75%, and for the arc-shaped motor, the slot fill rate at the outer diameter is much lower than that at the inner diameter, which means that the average slot fill rate of the conventional winding structure of the arc-shaped motor is usually about 50%; and there is a gap area between the enameled wires, which is usually air, impregnated paint or epoxy glue, so there is generally a small thermal conductivity coefficient. The high slot fill rate of the application is beneficial to the heat conduction inside the winding, and it is easy to realize the rapid conduction loss of the heat dissipation surface. In addition, the cooling water channel is directly arranged in the middle of the winding, and the shape of the winding is matched with the cooling water channel, which shortens the thermal resistance between the heat source and the heat dissipation surface, and is more conducive to enhancing the heat dissipation effect and reducing the winding temperature rise. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is an example one wedge-shaped tooth variable cross-section winding permanent magnet arc-shaped motor;

[0024] Figure 2 It is an example one primary core structure;

[0025] Figure 3 It is an example two variable cross-section winding structure;

[0026] Figure 4 It is an example three cooling pipe built-in in the middle section view of the armature winding;

[0027] Figure 5 It is an example four cooling pipe built-in in the middle section view of the armature winding;

[0028] Figure 6 It is an example five trapezoidal cross-section winding structure;

[0029] Figure 7 Example 6 shows a trapezoidal cross-section winding structure;

[0030] Figure 8 Torque comparison curves under the same load conditions;

[0031] Figures 1-3 In the diagram, 1-primary core; 1-1: primary yoke; 1-2: primary tooth; 1-3: primary slot; 2-armature winding; 3-permanent magnet; 4-secondary core; 5-1~5-4: cooling pipes; 6-1~6-n: first layer~nth layer conductors; 7-air gap;

[0032] Figure 4 In the diagram, 6-1 to 6-6 are the first to sixth layers of conductors;

[0033] Figure 5 In the diagram, 6-7 to 6-12 are the first to sixth layers of conductors;

[0034] Figures 6-7 In the diagram, 6-1-1 to 6-6-1 are the first to sixth layers of conductors (wound in the primary slot on the left side of the primary tooth); 6-1-2 to 6-6-2 are the first to sixth layers of conductors (wound in the primary slot on the right side of the primary tooth). Detailed Implementation

[0035] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0036] The cross-section referred to in the following embodiments:

[0037] The cross-section of the primary tooth is perpendicular to the direction of the motor's arc radius;

[0038] The cross-section at any position of the primary slot is perpendicular to the direction of the motor's arc radius;

[0039] The cross-section of the armature winding conductor is divided into the conductor cross-section in the primary slot and the conductor cross-section at both ends. The conductor cross-section in the slot is a cross-section perpendicular to the arc radius of the motor, and the conductor cross-section at both ends is a radial cross-section along the arc radius.

[0040] Example 1:

[0041] like Figure 1 and Figure 2As shown, this embodiment is a wedge-tooth variable cross-section winding permanent magnet arc motor, which includes a primary assembly and a secondary assembly. Both the primary and secondary assemblies are arc-shaped. The primary assembly includes a primary core 1 and an armature winding 2, with or without cooling pipes 5, depending on actual needs. Slots are cut into the primary core to form a primary yoke 1-1, S primary teeth 1-2, and Q primary slots 1-3 (S and Q are integers). The secondary assembly consists of a secondary core 4 and permanent magnets 3. An air gap 7 separates the primary and secondary assemblies.

[0042] The wedge-shaped tooth variable cross-section winding permanent magnet arc motor has an inner arc diameter of r1 and an outer arc diameter of r2, meaning the radius at the inner diameter is r1 and the radius at the outer diameter is r2. The width b2 of the primary slot 1-3 at the outer arc diameter is greater than the width b1 of the primary slot 1-3 at the inner arc diameter. The height h2 of the primary tooth 1-2 at the outer arc diameter is less than the height h1 of the primary tooth 1-2 at the inner arc diameter. Each primary tooth 1-2 has a wedge-shaped structure.

[0043] At the cross-section with the inner arc diameter r1, the primary groove 1-3 is rectangular in shape, with a width of b1 and a height of h1. At the cross-section with the outer arc diameter r2, the primary groove 1-3 is also rectangular in shape, with a width of b2 and a height of h2. As the arc radius r increases from r1 to r2, the cross-sectional width b of the primary groove 1-3 gradually increases from b1 to b2, while the groove height h gradually decreases from h1 to h2, which is the wedge-shaped variable cross-section design of the primary tooth.

[0044] At the inner diameter and outer radius of the arc, the cross-sectional areas of primary grooves 1-3 are equal or approximately equal, i.e., b 1· h1 = b 2· h2 or b 1· h1≈b 2· h2. The cross-sectional area at any point in the middle is equal to or similar to that at the inner and outer diameters. This ensures that the cross-sectional area of ​​the slots is basically the same at different arc radii, improving the armature winding and maintaining a high slot fill factor.

[0045] The armature winding 2 is manufactured using additive manufacturing and has n layers of conductors 6 (n is a natural number). The cross-sectional areas of each layer of conductors 6 in the armature winding 2 may be the same or different. The winding direction of each layer of conductors may be the same or different, but the cross-sectional area of ​​all conductors at any position must be equal to ensure the current density is the same throughout the conductors. The cross-sectional areas of the conductors in the slots and at the ends are equal. Within each armature winding, the cross-sectional shapes of each layer of conductors on both sides of the same primary tooth may be the same or different. The conductors are toroidal, and the cross-sectional area of ​​each part is equal.

[0046] Example 2:

[0047] This example is further designed in that,Figure 3 As shown, the cross-section of each conductor layer in the armature winding is rectangular, and at any arc radius r, the conductor shape adapts to the shape changes of the primary slots 1-3. At the inner arc diameter, the width and height of the conductor cross-sections on both sides are w1 and hw1, respectively. At the outer arc diameter, the width and height of the conductor cross-sections are w2 and hw2, respectively, where w1 ≠ w2 and hw1 ≠ hw2. Along the conductor winding direction, the conductor cross-sectional shape changes gradually from the inner to the outer arc diameter; the conductor cross-sectional width gradually increases from w1 to w2, and the height gradually decreases from hw1 to hw2. The conductor cross-sectional area w1·h1 at the inner arc diameter is equal to the conductor cross-sectional area w2·h2 at the outer arc diameter, i.e., w1·hw 1＝ w2·hw2, and the area at any cross-section of a single conductor is equal. In this example, the structure of each conductor layer is the same.

[0048] The cross-sectional area of ​​the slot conductor and the end conductor of the first layer conductor 6-1 of the armature winding 2 wound on the teeth are equal. Depending on the structural characteristics of the external terminals, the cross-sectional shape of the end conductor can be designed to be the same as or different from that of the slot conductor.

[0049] By using additive manufacturing to match the shape of the armature winding 2 with the primary slots 1-3, the cross-sectional area of ​​the slots is basically the same at different arc radii, and the slot fill factor is kept high. This avoids the problem of large hollow areas in the slot windings at the arc outer diameter that exists in traditional disc-type permanent magnet arc motors.

[0050] Example 3:

[0051] This example is further designed in that, Figure 4 As shown, cooling pipes 5 can be installed within the armature winding 2. One cooling pipe is installed in each primary slot 1-3. The conductors 6-1, 6-2, 6-4, 6-5, and 6-6 have the same layer structure and the same cross-sectional shape at each position. Each primary slot 1-3 contains one cooling pipe. In the figure, cooling pipe 5-1 is in close contact with conductor 6-3. Due to the shape of cooling pipe 5-1, the cross-sectional shape of conductor 6-3 differs from that of other conductors 6-1, 6-2, 6-3, 6-5, and 6-6, but its cross-sectional area remains equal to that of other conductors 6-1, 6-2, 6-4, 6-5, and 6-6 at any cross-sectional position. The cooling pipes adopt a ring structure. Cooling pipe 5-2 and cooling pipe 5-3 form a continuous ring pipe, introduced from one side of the armature winding and led out from the other side. Alternatively, cooling pipe 5-2 and cooling pipe 5-3 can also function as two separate cooling pipes, introduced and led out separately. Figure 4 As can be seen, the cooling pipe 5-1 is located between the two armature windings and between the adjacent conductors of the two armature windings.

[0052] Example 4:

[0053] This example is further designed in that, Figure 5 As shown, each primary slot 1-3 is equipped with two cooling pipes. The positions of cooling pipes 5-3 and 5-4 are determined by specific heat dissipation requirements. The cross-sectional shapes of conductors 6-8 and 6-11, which are in close contact with the cooling pipes, differ from those of conductors 6-7, 6-9, 6-10, and 6-12 in other layers, but their cross-sectional areas remain equal to those of conductors 6-7, 6-9, 6-10, and 6-12 at any cross-sectional position. Both cooling pipes adopt a ring structure, introduced from one side of the armature winding and led out from the other side. Figure 5 As can be seen, cooling pipe 5-3 is located between the two armature windings and between adjacent conductors of the two armature windings. Depending on the actual heat dissipation requirements, multiple cooling pipes can be installed in each primary slot, such as m cooling pipes, where m is a natural number ≥ 2.

[0054] Example 5:

[0055] This example is further designed in that, Figure 6 As shown, the cross-section of each conductor layer in the armature winding is trapezoidal, and the cross-sectional area of ​​each conductor layer is equal. The armature winding wound on the primary tooth 1-2 includes the slot winding and the end winding connecting the slot winding. The slot winding is divided into left and right side windings. The slot winding located to the left of the primary tooth 1-2 consists of the first to sixth layers of conductors 6-1-1, 6-2-1, 6-3-1, 6-4-1, 6-5-1, and 6-6-1, which have trapezoidal cross-sections, with the width gradually increasing and the height gradually decreasing from top to bottom. The slot winding located to the right of the primary tooth 1-2 consists of the first to sixth layers of conductors 6-1-2, 6-2-2, 6-3-2, 6-4-2, 6-5-2, and 6-6-2, which have trapezoidal cross-sections, with the width gradually decreasing and the height gradually increasing from top to bottom. Each layer of left and right side conductors constitutes one conductor layer. The cross-section of the end winding of the slot winding can be trapezoidal or other shapes. The first layer of conductors wound around the primary tooth 1-2 includes the first layer conductors 6-1-1 and 6-1-2 located in the left and right primary slots. They are both trapezoidal in cross-section, with equal cross-sectional areas but different cross-sectional shapes.

[0056] Example 6:

[0057] This example is further designed in that, Figure 7As shown, the cross-section of each conductor layer is trapezoidal, and the cross-sectional area of ​​each conductor layer is equal. The first conductor layer 6-1-1 and 6-1-2, located in the left and right primary slots of primary tooth 1-2 respectively, both have trapezoidal cross-sections with equal cross-sectional areas, and their shapes are symmetrical with respect to primary tooth 1-2. The width of the first to sixth conductor layers 6-1-1, 6-2-1, 6-3-1, 6-4-1, 6-5-1, and 6-6-1 in the left slot gradually increases from top to bottom, while the height gradually decreases; the width of the first to sixth conductor layers 6-1-2, 6-2-2, 6-3-2, 6-4-2, 6-5-2, and 6-6-2 in the right slot is symmetrical to this. The first conductor layer has the shortest base and the largest height, while the sixth conductor layer has the longest base and the smallest height. From the first to the sixth conductor layer, the base of the trapezoidal cross-section gradually decreases, while the height gradually increases.

[0058] Each primary slot contains one side of two armature windings, such as Figure 7 In the primary slot to the left of primary tooth 1-2, the left side of the first armature winding and the right side of the second armature winding are located. The width of the first to sixth layers of conductors (6-1-1, 6-2-1, 6-3-1, 6-4-1, 6-5-1, 6-6-1) on the left side of the first armature winding gradually increases, while the height gradually decreases. Similarly, on the right side of the second armature winding in the same slot, the width of each layer of conductors gradually decreases from top to bottom, while the height gradually increases. The first layer of conductors has the longest base and the smallest height, while the sixth layer has the shortest base and the largest height. The base of the trapezoidal cross-section of the conductors from the first to the sixth layer gradually decreases, while the height gradually increases.

[0059] An armature winding is located in two primary slots. The conductor cross-sectional shapes in the two slots can be the same or different, as long as the cross-sectional area of ​​each layer of conductors is equal. When installing the primary winding coil, first, the primary winding coil with the longer base side of the trapezoidal cross-section of the first layer conductor of the second armature winding is fitted onto primary tooth 1-2. Then, the primary winding coil with the shorter base side of the trapezoidal cross-section of the first layer conductor of the other first armature winding is fitted onto the adjacent primary tooth 1-2.

[0060] Simulation Example 1:

[0061] The following simulation experiments were conducted on the conventional winding DPMAM permanent magnet arc motor (hereinafter referred to as: conventional winding DPMAM) and the wedge-tooth variable cross-section winding permanent magnet arc motor of the present invention (hereinafter referred to as: AM variable cross-section winding DPMAM):

[0062] The structure and electromagnetic parameters of conventional winding DPMAM and AM variable cross-section winding DPMAM are shown in Tables 1 and 2:

[0063] Table 1 Traditional Winding DPMAM

[0064] Inner diameter 171.5 mm Tooth height 18 mm Outer diameter 236.5 mm Tooth width at mean radius 6.4 mm Permanent magnet thickness 3 mm Slot width at mean radius 6.9 mm Pole pitch at mean radius 20 mm Bare wire diameter 0.85 mm Pole arc coefficient 0.75 Number of winding turns per slot 114 Secondary back yoke thickness 8 mm Root mean square load current 10A Primary back yoke thickness 6 mm

[0065] Table 2 AM Variable Cross-Section Winding DPMAM

[0066] Inner diameter 171.5 mm Inner tooth height 24 mm Outer diameter 236.5 mm Outer tooth height 21 mm Permanent magnet thickness 3 mm Tooth width at mean radius 6.4 mm Pole pitch at mean radius 20 mm Slot width at mean radius 6.9 mm Pole arc coefficient 0.75 Winding cross-sectional area 2.5 mm 2 ]] Secondary back yoke thickness 8 mm Number of winding turns per slot 30 Primary back yoke thickness 6 mm Root mean square load current 45A

[0067] Three-dimensional finite element electromagnetic simulation tests were conducted on the conventional winding DPMAM and the AM variable cross-section winding DPMAM. An effective current of 10A was applied to the conventional winding DPMAM, and an effective current of 45A was applied to the AM variable cross-section winding DPMAM, while maintaining an effective current density of 18A / mm for both. 2 The torque comparison curves under the same load conditions are shown below. Figure 6 As shown.

[0068] Depend on Figure 8 It can be seen that, under the same electrical density conditions, the average torque of the wedge-tooth variable cross-section winding permanent magnet arc motor of the present invention can be increased by more than 12% compared with the conventional winding DPMAM permanent magnet arc motor. The motor of the present invention has improved torque density and good dynamic performance.

Claims

1. A wedge-shaped tooth variable cross-section winding permanent magnet arc-shaped motor, comprising a primary assembly and a secondary assembly, the primary assembly and the secondary assembly are arc-shaped in shape, the primary assembly comprises a primary iron core and an armature winding, the primary iron core is slotted to form a primary yoke (1-1), a primary tooth (1-2) and a primary slot (1-3) structure, the secondary assembly comprises a secondary iron core (4) and a permanent magnet (3); the structure of an air gap (7) is formed between the primary assembly and the secondary assembly; the arc-shaped inner diameter of the motor is r 1, and the arc-shaped outer diameter is r 2; characterized in that: Each primary tooth (1-2) adopts a wedge-shaped structure, when the arc radius is increased from r 1 to r 2, the cross-sectional width of the primary slot (1-3) is gradually increased from b 1 to b 2, the cross-sectional slot height is gradually reduced from h 1 to h 2, the height of the primary tooth at the arc outer diameter h 2 is less than the height of the primary tooth at the arc inner diameter h 1, the height of the primary tooth (1-2) gradually decreases from the arc inner diameter to the arc outer diameter, while the cross section of the primary slot (1-3) at any position is rectangular, the areas of the rectangular cross sections are equal or close; the armature winding (2) adopts a multi-layer conductor structure, the areas of the cross sections of all conductors at any position are equal.

2. The wedge tooth variable cross-section winding permanent magnet arc-shaped motor according to claim 1, characterized in that: The armature winding (2) is made by using an additive manufacturing process.

3. The wedge tooth variable cross section winding permanent magnet arc-shaped motor according to claim 2, characterized in that: The cross-sectional shape of each layer conductor (6) of each armature winding (2) is the same or different.

4. The wedge tooth variable cross section winding permanent magnet arc-shaped motor according to claim 3, characterized in that: The cross-sectional shape of each layer conductor in each armature winding (2) is the same or different in the two side parts of the same primary tooth.

5. The wedge tooth variable cross section winding permanent magnet arc-shaped motor according to claim 4, characterized in that: The winding direction of each layer conductor is the same or different.

6. The wedge tooth variable cross section winding permanent magnet arc-shaped motor according to claim 5, characterized in that: The structure of each layer conductor (6) in the armature winding (2) is the same, the width of the conductor gradually increases from the arc-shaped inner diameter to the arc-shaped outer diameter w 1 w 2 hw 1 hw 2 The area of the cross section of each layer conductor (6) at any position is equal.

7. The wedge tooth variable cross section winding permanent magnet arc-shaped motor according to claim 5, characterized in that: The cross-section of the conductor (6) of the armature winding (2) adopts a trapezoidal structure.

8. The wedge-shaped tooth variable cross-section winding permanent-magnet arc-shaped motor according to any one of claims 1-7, characterized in that: The armature winding (2) is provided with a cooling pipe (5).

9. The wedge-shaped tooth variable cross-section winding permanent-magnet arc-shaped motor according to claim 8, characterized in that: The cooling pipe (5) is embedded between the conductors of the armature winding, and the shape of the conductors at the corresponding position is changed due to the adaptation with the cooling pipe (5), and the cross-sectional area of the conductor at any position after the shape change remains equal to the cross-sectional area of the conductor without the cooling pipe (5).

10. The wedge tooth variable cross section winding permanent magnet arc-shaped motor according to claim 9, characterized in that: The cooling pipe (5) embedded in the armature winding passes through the cooling groove in the armature winding and is led out by the cooling end between the conductor layers at the end of the armature winding (2).

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