Energy-saving stator core of mine-used permanent magnet motor

Abstract

This invention discloses an energy-saving stator core for a mining permanent magnet motor, relating to the field of energy-saving motor technology. It includes outer and inner slots disposed on the core body, both extending axially along the core body. Multiple outer and inner slots are provided, and these slots are staggered around the core body's axis. This energy-saving stator core for the mining permanent magnet motor, by using staggered outer and inner slots, combined with coils arranged in a way that fills the slot cavity and abuts against each other, reduces air gaps within the slots, improves winding heat dissipation, alleviates excessive temperature rise under heavy load and frequent start-stop conditions, reduces operating losses, and improves overall machine efficiency. Simultaneously, the windings form a self-locking integral structure, suppressing winding vibration and deformation. Electrical connection is achieved through coil end overlap, eliminating external jumpers and welding points, thus meeting the requirements of continuous heavy-load operation in mines and frequent start-stop conditions for new energy electric vehicle motors.

Description

Technical Field

[0001] This invention relates to the field of energy-saving motor technology, and in particular to an energy-saving stator core for a mining permanent magnet motor. Background Technology

[0002] Permanent magnet motors, with their high power density and excellent operating efficiency, are widely used in mining power equipment, new energy electric vehicle drive equipment and other fields. The stator core, as the core component of permanent magnet motors that realizes magnetic flux transmission and carries the stator windings, directly determines the motor's heat dissipation capacity, winding fixation reliability and electromagnetic operation performance.

[0003] In existing technologies, most permanent magnet motors adopt traditional loose-wound winding structures. Due to the limitations of the shape of the loose-wound round conductors and the assembly process, the coils are loosely arranged after being placed in the stator slots. The coil conductors cannot be fully and tightly attached to the inner wall of the stator slots, and multiple air gaps are formed between the conductors and the slot walls. Since air has a low thermal conductivity, it increases the thermal resistance of heat transfer from the windings to the stator core. The heat generated by the windings is difficult to conduct outward and tends to accumulate in the slots. Under the conditions of continuous heavy-load operation in mines and frequent start-stop of motors in new energy electric vehicles, the heat load of the windings is high, which can easily lead to motor overheating. This not only accelerates the aging of the winding insulation and shortens the service life of the motor, but also increases the operating losses of the motor and reduces the overall working efficiency.

[0004] Therefore, it is necessary to propose an energy-saving stator core for a mining permanent magnet motor to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide an energy-saving stator core for a mining permanent magnet motor, in order to solve the problem that the high heat load of the windings easily leads to motor overheating, which not only accelerates the aging of the winding insulation but also shortens the service life of the motor.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an energy-saving stator core for a mining permanent magnet motor, comprising an outer wire groove and an inner wire groove disposed on the core body, wherein the outer wire groove and the inner wire groove extend through the core body along the axial direction, and multiple outer wire grooves and multiple inner wire grooves are disposed, and the multiple outer wire grooves and multiple inner wire grooves are distributed alternately around the axis of the core body.

[0007] The radial distance from the inner groove to the axis of the core body is less than the radial distance from the outer groove to the axis of the core body. Adjacent outer and inner wire slots form a wire-passing section. A single-bundled coil passes through the outer wire slot of one of the wire-passing sections and the inner wire slot of the adjacent wire-passing section. Adjacent coils press against each other in sequence. Multiple sets of coils cooperate and are arranged together to form the stator winding of the motor. The cross-sectional area of ​​the coil is adapted to the cross-sectional areas of the outer and inner wire slots.

[0008] Preferably, the total number of the outer and inner cable trays is set to 20 to 36.

[0009] Preferably, a first wire-passing channel is provided on the side of the outer wire groove near the axis of the iron core body. The first wire-passing channel penetrates the inner ring of the iron core body, and the width of the first wire-passing channel is smaller than the diameter of the outer wire groove. A second wire-passing channel is provided on the side of the inner wire groove near the axis of the iron core body. The second wire-passing channel passes through the inner ring of the iron core body, and the width of the second wire-passing channel is smaller than the diameter of the inner wire groove.

[0010] Preferably, a first limiting component is provided at the first wire passage. The first limiting component includes a first insert, a first elastic piece, and a first locking block. The first elastic piece, the first insert, and the first locking block are connected in sequence. The first insert is inserted into the first wire passage. A first inner wall groove for the first elastic piece to be engaged is provided on the inner wall of the outer wire groove. A first locking groove for the first locking block to be engaged is provided on the inner ring of the core body. The lengths of both the first slot and the first block are less than the axial length of the core body.

[0011] Preferably, a second limiting component is provided at the second wire passage. The second limiting component includes a second insert block, a second elastic piece, and a second locking block. The second elastic piece, the second insert block, and the second locking block are connected in sequence. The second insert block is inserted into the second wire passage. A second inner wall groove is provided on the inner wall of the inner wire groove for the second elastic piece to be engaged. A second locking groove is provided on the inner ring of the core body for the second locking block to be engaged. The lengths of both the second slot and the second block are less than the axial length of the core body.

[0012] Preferably, a first protrusion is fixed on the side of the first elastic sheet facing the coil, and the first protrusion is located at the end of the first elastic sheet; A second protrusion is fixed to the side of the second elastic sheet facing the coil, and the second protrusion is located at the end of the second elastic sheet.

[0013] Preferably, both the first bump and the second bump are made of magnetically conductive material; The first limiting component is made of a non-magnetic material.

[0014] Preferably, the ends of the coils that are pressed against each other are provided with a partially de-insulated connection area, and adjacent coils are electrically connected through the partially de-insulated connection area.

[0015] Preferably, the core body is formed by stacking multiple electrical silicon steel laminations.

[0016] Preferably, the iron core body is installed and limited inside the motor housing, and the inner space is arranged opposite to the permanent magnet rotor, and the two work together to form the main magnetic circuit of the motor.

[0017] The technical effects and advantages of this invention are as follows: 1. This invention reduces air gaps in the slots and improves winding heat dissipation by setting up staggered outer and inner wire slots, combined with coils arranged in a way that fills the slot cavity and presses against each other. This alleviates the problem of excessive temperature rise under heavy load and frequent start-stop conditions, reduces operating losses, and improves overall machine efficiency. At the same time, the windings form a self-locking integral structure to suppress winding vibration and deformation. Electrical connection is achieved by using coil end overlap, eliminating external jumper wires and welding points, which meets the working conditions of continuous heavy load operation in mines and frequent start-stop of motors in new energy electric vehicles. 2. Based on the foundation of clamping and fixing the electrical silicon steel laminations, the present invention forms circumferential limiting on each layer of electrical silicon steel laminations by assembling the first limiting component and the second limiting component, which effectively suppresses the deflection, misalignment and loosening of the electrical silicon steel laminations, and improves the overall structural consistency and mechanical stability of the core body. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the energy-saving stator core structure of the mining permanent magnet motor of the present invention.

[0019] Figure 2 For the present invention Figure 1 Enlarged schematic diagram of the structure at point A in the middle.

[0020] Figure 3 For the present invention Figure 1 Enlarged schematic diagram of the structure at point B.

[0021] Figure 4 This is a schematic diagram of the outer and inner cable tray structures of the present invention.

[0022] Figure 5 For the present invention Figure 4 Enlarged schematic diagram of the structure at point C.

[0023] Figure 6 This is a schematic diagram of the structure of the first and second insert blocks of the present invention.

[0024] Figure 7 For the present invention Figure 6 Enlarged schematic diagram of the structure at point D.

[0025] Figure 8 This is a schematic diagram of the structure of the first and second elastic sheets of the present invention.

[0026] Figure 9 For the present invention Figure 8 Enlarged schematic diagram of the structure at point E in the middle.

[0027] Figure 10 This is a schematic diagram of the core body and coil structure of the present invention.

[0028] Figure 11 This is a schematic diagram of the outer wire groove, inner wire groove, and coil structure of the present invention.

[0029] In the diagram: 1. Core body; 101. Outer groove; 1011. First inner wall groove; 1012. First wire passage; 102. Inner groove; 1021. Second inner wall groove; 1022. Second wire passage; 2. Electrical silicon steel lamination; 3. First insert block; 4. First elastic sheet; 5. First protrusion; 6. First slot; 7. First locking block; 8. Second insert block; 9. Second elastic sheet; 10. Second protrusion; 11. Second slot; 12. Second locking block; 13. Coil. Detailed Implementation

[0030] This invention provides, for example Figures 1 to 11 The diagram shows an energy-saving stator core for a mining permanent magnet motor, comprising a core body 1 in a ring shape, which is formed by stacking multiple electrical silicon steel laminations 2. In actual use, the core body 1 is installed and limited inside the motor housing, with its outer side cooperating with the inner wall of the housing to achieve centering and heat exchange. The inner space is positioned opposite to the permanent magnet rotor, and the two work together to form the main magnetic circuit of the motor. This type of permanent magnet motor is suitable for long-term heavy-load working conditions in mines and can also be used in related power equipment such as drive motors for new energy electric vehicles. Its working principle is a common existing technology and will not be described in detail here.

[0031] In traditional technology, permanent magnet motors mostly adopt the traditional loose winding structure. Due to the limitations of the shape of the loosely wound round conductors and the assembly process, the coils are loosely arranged after being placed in the stator slots. The coil conductors cannot be fully and tightly attached to the inner wall of the stator slots, and multiple air gaps are formed between the conductors and the slot walls. Since air has a low thermal conductivity, it will increase the thermal resistance of heat transfer from the windings to the stator core. The heat generated by the windings is difficult to conduct outwards and tends to accumulate in the slots. In the face of continuous heavy-load operation in mines and frequent start-stop of motors in new energy electric vehicles, the heat load of the windings is high, and the motor is prone to overheating. This not only accelerates the aging of the winding insulation and shortens the service life of the motor, but also increases the operating losses of the motor and reduces the overall working efficiency.

[0032] Therefore, the present invention provides an outer wire groove 101 and an inner wire groove 102 on the core body 1. Both the outer wire groove 101 and the inner wire groove 102 extend through the core body 1 along the axial direction. The radial distance from the inner wire groove 102 to the axis of the core body 1 is less than the radial distance from the outer wire groove 101 to the axis of the core body 1. Multiple outer wire grooves 101 and multiple inner wire grooves 102 are provided. Multiple outer wire grooves 101 are evenly arranged around the axis of the core body 1, and multiple inner wire grooves 102 are evenly arranged around the axis of the core body 1. The multiple outer wire grooves 101 and multiple inner wire grooves 102 are distributed alternately in sequence.

[0033] Reference Figure 10 and Figure 11 As shown, during actual installation, adjacent outer wire grooves 101 and inner wire grooves 102 form a wire-passing section. A single-stranded coil 13 passes through one of the outer wire grooves 101 of the wire-passing section and the inner wire groove 102 of the adjacent wire-passing section. After the coil 13 is installed, two adjacent coils 13 are pressed against each other in sequence. Multiple sets of coils 13 are arranged in cooperation with each other and together form the stator winding of the motor. The cross-sectional area of ​​the coil 13 is adapted to the cross-sectional area of ​​the outer wire groove 101 and the inner wire groove 102. The coil 13 is fully arranged inside the outer wire groove 101 and the inner wire groove 102. The inner diameter of the outer wire groove 101 and the inner wire groove 102 is the same.

[0034] Through the above design: First, the coil 13 is pressed tightly against the inner wall of the outer groove 101 or the inner groove 102, increasing the effective contact area between the coil 13 and the iron core 1, shortening the heat conduction path, and allowing the heat generated by the coil 13 to be quickly conducted to the iron core 1, enhancing the heat dissipation effect, reducing motor operating losses, and achieving energy saving; Second, the mutual abutment between the coils 13 forms a stable mechanical limit, reducing the risk of coil 13 loosening or shifting caused by motor operating vibration and temperature fluctuations, continuously maintaining close contact between the coil 13 and the groove wall, reducing air gaps in the groove, further improving the heat transfer efficiency of the coil 13 to the iron core 1, and adapting to the temperature rise control requirements of long-term heavy-load and explosion-proof conditions for mining permanent magnet motors. Third, the sequential pressing of two adjacent coils 13 can limit excessive bending of the ends of the coils 13 extending from the outer groove 101 and inner groove 102, avoiding stress concentration after the coils 13 are formed. At the same time, it reduces the friction and rubbing between the coils 13 and the edges of the outer groove 101 and inner groove 102, improving the safety of motor operation. Fourth, each group of coils 13 supports and constrains each other, forming a continuous limiting structure in the axial direction of the iron core body 1. This can limit the coils 13 from moving along the axial direction of the iron core body 1, avoiding problems such as the gradual axial displacement of the coils 13 under continuous vibration conditions. Sixth, all the coils 13 are locked together to form an integral ring frame, effectively weakening the circumferential vibration of the coils 13 induced by alternating electromagnetic force and reducing stator operating noise.

[0035] In addition, the ends of coils 13 that are pressed against each other are pre-cured and bundled, and a localized de-insulation connection area is set, while the insulation layer is completely retained in the rest of the coils 13. After assembly, the exposed conductor sections of adjacent coils 13 are tightly connected by continuous extrusion pressure to achieve electrical connection. Only a small number of jumpers are configured at each conductor connection position to reinforce the conduction. This structure can significantly reduce the number of external jumpers and independent welding points required by traditional windings. The electrical series networking is mainly completed by the end structure of the coil 13 itself. The number of free exposed wires and welding joints at the winding ends is significantly reduced, which effectively alleviates the safety hazards such as welding point heating, vibration-induced poor welding and detachment, and welding point insulation damage under explosion-proof conditions in mines. It improves the electrical operation stability and explosion-proof reliability of the stator winding, and is suitable for high-vibration and harsh explosion-proof application scenarios in mines. The electrical connection is a common existing technology, which will not be described in detail here.

[0036] In summary, this invention, by setting up staggered outer wire slots 101 and inner wire slots 102, and cooperating with coils 13 arranged in a way that fills the slot cavity and abuts against each other, reduces the air gap in the slots, improves the heat dissipation of the windings, alleviates the problem of excessive temperature rise under heavy load and frequent start-stop conditions, reduces operating losses, and improves the overall efficiency of the machine. At the same time, the windings form a self-locking integral structure, suppressing the vibration and deformation of the windings, and the electrical connection is achieved by using the end connection of the coils 13, eliminating the need for external jumpers and welding points, thus meeting the working conditions of continuous heavy load operation in mines and frequent start-stop of motors in new energy electric vehicles.

[0037] It should be noted that the total number of outer wire grooves 101 and inner wire grooves 102 is set to 20 to 36. This range of numbers can ensure that the adjacent coils 13 are subjected to uniform and stable pressure when pressed against each other, which is conducive to maintaining reliable contact of the exposed ends of the coils 13. At the same time, it prevents the number of grooves from weakening the rigidity of the core body 1 and ensures the structural strength of the core body 1.

[0038] Reference Figure 2 , Figure 3 , Figure 5 and Figure 7 As shown, the outer wire groove 101 has a first wire passage 1012 on the side near the axis of the core body 1. The first wire passage 1012 penetrates the inner ring of the core body 1, and the width of the first wire passage 1012 is smaller than the diameter of the outer wire groove 101. The inner wire groove 102 has a second wire passage 1022 on the side near the axis of the core body 1. The second wire passage 1022 penetrates the inner ring of the core body 1, and the width of the second wire passage 1022 is smaller than the diameter of the inner wire groove 102.

[0039] During actual assembly, the single-stranded coil 13 is placed in the inner ring position of the iron core body 1, with one end of the coil 13 corresponding to the first wire channel 1012 and the other end corresponding to the second wire channel 1022. Using structures such as pressure plates, the multiple wires of the coil 13 are combed, guided and pressed into the first wire channel 1012 and the second wire channel 1022 one by one, so that the wires are smoothly embedded in the outer wire groove 101 and the inner wire groove 102, thus completing the overall installation of the coil 13.

[0040] Reference Figure 2 , Figure 3 , Figure 5 and Figure 7 As shown, a first limiting component is provided at the first wire passage 1012. The first limiting component includes a first insert block 3, a first elastic piece 4, and a first locking block 7. The first insert block 3 is inserted into the first wire passage 1012. The first elastic piece 4 is fixed at one end of the first insert block 3 near the outer wire groove 101. A first inner wall groove 1011 is provided on the inner wall of the outer wire groove 101 for the first elastic piece 4 to be locked. The first inner wall groove 1011 is correspondingly connected to the first wire passage 1012. The first locking block 7 is fixed at one end of the first insert block 3 away from the first elastic piece 4. A first locking groove 6 is provided on the inner ring of the core body 1 for the first locking block 7 to be locked. The lengths of the first locking groove 6 and the first locking block 7 are both less than the axial length of the core body 1. When the first locking block 7 is locked into the first locking groove 6, no axial movement will occur.

[0041] A second limiting component is provided at the second wire passage 1022. The second limiting component includes a second insert block 8, a second elastic piece 9, and a second locking block 12. The second insert block 8 is inserted into the second wire passage 1022. The second elastic piece 9 is fixed at one end of the second insert block 8 near the inner wire groove 102. A second inner wall groove 1021 is provided on the inner wall of the inner wire groove 102 for the second elastic piece 9 to engage. The second inner wall groove 1021 is correspondingly connected to the second wire passage 1022. The second locking block 12 is fixed at one end of the second insert block 8 away from the second elastic piece 9. A second slot 11 is provided on the inner ring of the core body 1 for the second locking block 12 to engage. The lengths of the second slot 11 and the second locking block 12 are both less than the axial length of the core body 1. When the second locking block 12 is engaged in the second slot 11, no axial movement will occur.

[0042] In actual use, after the coil 13 is embedded in the outer wire groove 101 and the inner wire groove 102, the first insert block 3 together with the first elastic piece 4 is inserted into the first wire passage 1012. The first elastic piece 4 deforms adaptively. After the first elastic piece 4 extends into the outer wire groove 101, it restores its deformation and is locked into the inside of the first inner wall groove 1011, thereby isolating the outer wire groove 101 from the first wire passage 1012. The first elastic piece 4 and the inner wall of the outer wire groove 101 cooperate to form a lateral compression constraint on the coil 13, reducing the air gap in the groove and ensuring heat dissipation capacity. At the same time, it prevents the coil 13 from coming out of the first wire passage 1012 and restricts the radial displacement of the coil 13.

[0043] Simultaneously, the second insert 8, together with the second elastic piece 9, is inserted into the second wire passage 1022. The second elastic piece 9 deforms adaptively. After the second elastic piece 9 extends into the inner wire groove 102, it recovers its deformation and snaps into the interior of the second inner wall groove 1021, thereby isolating the inner wire groove 102 from the second wire passage 1022. The second elastic piece 9 and the inner wall of the inner wire groove 102 cooperate to form a lateral compression constraint on the coil 13, reducing the air gap in the groove and ensuring heat dissipation capacity. At the same time, it prevents the coil 13 from coming out of the second wire passage 1022 and restricts the radial displacement of the coil 13.

[0044] The distributed radial limiting of the first limiting component and the second limiting component, combined with the mutual squeezing structure between coils 13, improves the overall structural stability of the winding and suppresses the loosening and displacement of coils 13 caused by motor vibration.

[0045] After assembly, the first limiting component and the second limiting component respectively block the first wire passage 1012 and the second wire passage 1022, filling the slotted gap in the inner ring of the core body 1, so that the inner ring of the core body 1 forms a complete continuous annular surface, effectively eliminating the air gap unevenness and distortion caused by the traditional slotted structure, ensuring that the circumferential air gap of the motor is uniform, weakening the harmonic components of the magnetic field, reducing the air gap harmonic loss and electromagnetic vibration noise of the motor, and effectively improving the smoothness of motor operation and overall working efficiency.

[0046] Furthermore, since the core body 1 is composed of multiple electrical silicon steel laminations 2 stacked together, under the continuous action of high-frequency vibration and frequent start-stop conditions of the motor, there is a potential risk of single laminations deflection, misalignment, and movement. The present invention, while achieving basic clamping and fixing of the electrical silicon steel laminations 2, forms circumferential limits on each layer of electrical silicon steel laminations 2 by assembling a first limiting component and a second limiting component, effectively suppressing the deflection, misalignment, and loosening of the electrical silicon steel laminations 2, and improving the overall structural consistency and mechanical stability of the core body 1.

[0047] Reference Figure 7 , Figure 8 and Figure 9As shown, a first protrusion 5 is fixed on the side of the first elastic sheet 4 facing the coil 13. The width of the first protrusion 5 is smaller than the width of the first wire passage 1012, ensuring that the wire passes through the first wire passage 1012 stably. There are two first protrusions 5, which are respectively distributed at both ends of the first elastic sheet 4. When the first elastic sheet 4 cooperates with the inner wall of the outer wire groove 101 to form a lateral pressing constraint on the coil 13, the first protrusion 5 is pressed on the coil 13 and located at the port of the outer wire groove 101, restricting the axial movement of the coil 13 and stabilizing the winding position. At the same time, the coil 13 forms a reverse pressing force on the first protrusion 5, causing the first elastic sheet 4 to fit tightly and be fixed in the first inner wall groove 1011, further improving the locking reliability and operational stability of the first limiting component after assembly.

[0048] Furthermore, at the port of the outer wire trough 101, the first protrusion 5 is fixed on the first elastic sheet 4. The first protrusion 5 is made of magnetically conductive materials such as electrical pure iron and acts as a compensating magnetic tongue. The first limiting component is made of non-magnetically conductive materials, such as austenitic stainless steel. On the one hand, this allows the first limiting component to focus on achieving the functions of structural filling and elastic clamping and limiting, avoiding large-area components from intervening in the main magnetic circuit and causing magnetic field disturbance and additional eddy current loss. On the other hand, it creates a difference in magnetic permeability between the filling area and the iron core body 1. The first protrusion 5 presses the supporting coil 13 on one side and is adjacent to the iron core body 1 on the other side of the outer wire trough 101 wall, building a magnetic passage channel. At the same time, the first wire passage 1 is opened on the iron core body 1. The 012 design causes a discontinuity in the outline of the core body 1 in this region. Even if the geometric outline is filled by the first limiting component, since the first limiting component is made of non-magnetic material and its magnetic permeability is much weaker than that of the core body 1, there is still a magnetic flux transition boundary at the port of the first threading channel 1012. The magnetic lines of force are prone to sharp bends and aggregation, resulting in a sharp increase in local magnetic flux density, inducing magnetic circuit distortion and generating additional eddy current losses, which in turn causes local overheating of the core. However, by using the first protrusion 5 of the magnetic material to form a transition magnetic circuit, the magnetic lines of force can be guided to transition smoothly, avoiding abrupt changes in magnetic flux concentration, improving the magnetic flux transmission path at the threading channel position, weakening the degree of magnetic circuit distortion, reducing eddy current losses, and effectively improving the local high temperature problem of the core body 1.

[0049] Meanwhile, a second protrusion 10 is fixed on the side of the second elastic sheet 9 facing the coil 13. There are two second protrusions 10, which are respectively distributed at both ends of the second elastic sheet 9. The second protrusion 10 is made of the same magnetic material as the first protrusion 5. As a compensating magnetic tongue, it works with the second limiting component to achieve the same magnetic flux guiding effect, which can improve the magnetic flux distribution in the inner wire groove 102 area, reduce local eddy current loss, and alleviate the local temperature rise of the iron core body 1.

[0050] In summary, by setting the first protrusion 5 and other structures, the axial movement of the coil 13 is restricted, the winding position is stabilized, the magnetic flux transmission path at the wire passage position is improved, the degree of magnetic circuit distortion is reduced, the eddy current loss is reduced, and the local high temperature problem of the iron core body 1 is effectively improved.

Claims

1. An energy-saving stator core for a mining permanent magnet motor, characterized in that: Includes an outer wire groove (101) and an inner wire groove (102) disposed on the core body (1). The outer wire groove (101) and the inner wire groove (102) extend through the core body (1) along the axial direction. Multiple outer wire grooves (101) and multiple inner wire grooves (102) are disposed. Multiple outer wire grooves (101) and multiple inner wire grooves (102) are distributed alternately around the axis of the core body (1). The radial distance from the inner groove (102) to the axis of the core body (1) is less than the radial distance from the outer groove (101) to the axis of the core body (1); The adjacent outer wire slot (101) and inner wire slot (102) form a wire-passing part. The single-bundled coil (13) passes through the outer wire slot (101) of one of the wire-passing parts and the inner wire slot (102) of the adjacent wire-passing part. The two adjacent coils (13) press against each other in turn. Multiple sets of coils (13) cooperate with each other and together form the stator winding of the motor. The cross-sectional area of ​​the coil (13) is adapted to the cross-sectional areas of the outer groove (101) and the inner groove (102).

2. The energy-saving stator core of a mining permanent magnet motor according to claim 1, characterized in that: The total number of the outer cable tray (101) and the inner cable tray (102) is set to 20 to 36.

3. The energy-saving stator core of a mining permanent magnet motor according to claim 1, characterized in that: The outer wire groove (101) has a first wire passage (1012) on the side close to the axis of the iron core body (1). The first wire passage (1012) passes through the inner ring of the iron core body (1). The width of the first wire passage (1012) is smaller than the diameter of the outer wire groove (101). The inner wire groove (102) has a second wire passage (1022) on the side near the axis of the iron core body (1). The second wire passage (1022) passes through the inner ring of the iron core body (1), and the width of the second wire passage (1022) is smaller than the diameter of the inner wire groove (102).

4. The energy-saving stator core of a mining permanent magnet motor according to claim 3, characterized in that: A first limiting component is provided at the first wire passage (1012). The first limiting component includes a first insert (3), a first elastic piece (4), and a first locking block (7). The first elastic piece (4), the first insert (3), and the first locking block (7) are connected in sequence. The first insert (3) is inserted into the first wire passage (1012). A first inner wall groove (1011) is provided on the inner wall of the outer wire groove (101) for the first elastic piece (4) to be locked. A first locking groove (6) is provided on the inner ring of the core body (1) for the first locking block (7) to be locked. The lengths of the first slot (6) and the first block (7) are both less than the axial length of the core body (1).

5. The energy-saving stator core of a mining permanent magnet motor according to claim 4, characterized in that: A second limiting component is provided at the second wire passage (1022). The second limiting component includes a second insert (8), a second elastic piece (9), and a second locking block (12). The second elastic piece (9), the second insert (8), and the second locking block (12) are connected in sequence. The second insert (8) is inserted into the second wire passage (1022). A second inner wall groove (1021) is provided on the inner wall of the inner wire groove (102) for the second elastic piece (9) to be engaged. A second locking groove (11) is provided on the inner ring of the core body (1) for the second locking block (12) to be engaged. The lengths of the second slot (11) and the second block (12) are both less than the axial length of the core body (1).

6. The energy-saving stator core of a mining permanent magnet motor according to claim 5, characterized in that: The first elastic sheet (4) has a first protrusion (5) fixed on the side facing the coil (13), and the first protrusion (5) is located at the end of the first elastic sheet (4); The second elastic sheet (9) has a second protrusion (10) fixed on the side facing the coil (13), and the second protrusion (10) is located at the end of the second elastic sheet (9).

7. The energy-saving stator core of a mining permanent magnet motor according to claim 6, characterized in that: Both the first protrusion (5) and the second protrusion (10) are made of magnetically conductive material; The first limiting component is made of a non-magnetic material.

8. The energy-saving stator core of a mining permanent magnet motor according to claim 1, characterized in that: The ends of the coils (13) that abut and press against each other are provided with a partial de-insulation connection area, and adjacent coils (13) are connected through the partial de-insulation connection area for electrical communication.

9. The energy-saving stator core of a mining permanent magnet motor according to claim 1, characterized in that: The core body (1) is formed by stacking multiple electrical silicon steel laminations (2).

10. The energy-saving stator core of a mining permanent magnet motor according to claim 1, characterized in that: The iron core body (1) is installed and limited inside the motor housing, and the inner space is set opposite to the permanent magnet rotor. The two work together to form the main magnetic circuit of the motor.

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