Water-cooled four-rotor hybrid flux wheel motor

Abstract

A water-cooled four-rotor hybrid flux wheel motor comprises a T-shaped split core, four stators, four rotors, a water-cooling structure and a main shaft. The T-shaped split core adopts I-shaped and arc-shaped silicon steel sheet structures, and a plurality of T-shaped split cores are combined into a four-stator core in the circumferential direction. The four stators comprise a radial outer stator, a radial inner stator, an axial left stator and an axial right stator. The four rotors comprise a radial outer rotor, a radial inner rotor, an axial left rotor and an axial right rotor. The four stators and the four rotors are provided as a double-radial and axial-radial hybrid flux structure. The water-cooling structure comprises axial left and right stator wire slot water-cooling pipes, radial outer stator core left and right end face circumferential double-helix water channels and radial inner stator core left and right end face circumferential triple-helix water channels. The water-cooled four-rotor hybrid flux wheel motor can improve the power density and cooling efficiency by optimizing the topological structure.

Description

Technical Field

[0001] This invention relates to a bidirectional hybrid flux motor in the field of motor technology, and more particularly to a water-cooled four-rotor hybrid flux hub motor. Background Technology

[0002] Permanent magnet motors, as the mainstream technology for hub motors, boast advantages such as high power density, high efficiency, compact structure, and good control performance, and are poised for further development. Permanent magnet motors are mainly classified into radial flux motors, axial flux motors, and transverse flux motors. Although axial flux motors and transverse flux motors have advantages in power density, torque density, and axial length, radial flux motors offer significant advantages in terms of manufacturing processes, design methods, and cost, and remain the primary type of motor used in hub motors.

[0003] Currently, axial motors have become a research hotspot due to their flat and ultra-thin structure, higher torque density, and better heat dissipation capabilities. Among various axial flux permanent magnet synchronous topologies, the NN and NS type magnetic circuit structures of single-stator dual-rotor motors exhibit the best performance. Compared to the NN type topology, the NS type topology uses a circular conductor cross-section and a shorter stator yoke, resulting in a more compact motor structure, further reduced weight, and improved power density. Simultaneously, it has lower core losses, leading to relatively higher power density and energy efficiency. The NN type topology uses rectangular cross-section conductors, resulting in a higher slot fill factor, easier winding distribution, and shorter end windings, effectively reducing heat generation in the end windings. TJ Woolmer et al. from Oxford University combined the advantages of the short stator yoke of the NS type topology with the higher slot fill factor of the NN type topology, proposing for the first time a topology for an axial flux segmented core yokeless motor (YASA structure). The YASA motor completely eliminates the magnetic yoke, which helps reduce stator core losses and overall motor weight, thereby increasing power density. It also allows for the use of rectangular cross-section conductors to achieve a higher slot fill factor. Therefore, the YASA motor offers advantages in higher power density and energy efficiency. In recent years, scholars from various countries have primarily focused on improving the power density and efficiency of axial flux motors from the perspectives of magnetic circuit optimization, enhancing material properties and topology, and improving motor heat dissipation efficiency.

[0004] The design of the cooling system for the stator core and windings of a hub motor has always been a key technology in motor development. The highest temperature of the motor is located at both ends of the windings, which are surrounded by air. The extremely low thermal conductivity of air causes heat to accumulate at the winding ends, forming high-temperature regions. Furthermore, due to the influence of the heat transfer path at the end windings, the stator core also exhibits a temperature distribution trend of high at both ends and low in the middle. There is a fitting air gap between the stator core and the housing; the heat from the core must dissipate through this gap. Since hub motors are in a closed system, a circulating cooling system should be used. Hub motor cooling is generally divided into three methods: air cooling, oil cooling, and water cooling. Air cooling has lower efficiency and is suitable for low-power, low-speed hub motors. Oil cooling has higher efficiency but suffers from sealing and wear issues. Water cooling is the most effective cooling method and is suitable for hub motors with high power / torque density and strong overload capacity. Water cooling systems significantly improve the motor's heat dissipation. Currently, water-cooled motors are mainly classified into three types: housing-cooled, housing-plus-end-cover-cooled, and housing-plus-end-cover-plus-shaft-cooled. The design of water-cooled structures for the stator windings and core needs further development.

[0005] Chinese patents CN 117526622 A, CN 115864768 A, and CN 110120716 A provide several motors with different structures and cooling solutions.

[0006] CN 117526622 A discloses an integrated internal and external rotor dual-stator hub motor drive system for heavy-duty trucks. The rotor is positioned between the inner and outer stators to improve its power. By integrating the heat dissipation mechanisms of the stator and brake drum, the problem of brake drum overheating and requiring water spraying is solved. However, the integrated internal and external rotor dual-stator hub motor is relatively large, and its power and torque density are still not high enough.

[0007] CN 115864768 A discloses a dual-rotor hub motor, including a radial dual-rotor structure and a stator mechanism in which the stator core and windings are sealed and welded together. Coolant directly passes through the stator mechanism to wet the stator core and windings, and a circulation mechanism removes the heat generated by the stator core and windings within the stator mechanism. This invention significantly improves working efficiency by removing heat through an internal stator cooling mechanism, and enhances the motor's power density and rotational torque through a radial dual-rotor design.

[0008] CN 110120716 A discloses a combined array type external rotor axial-radial hybrid flux permanent magnet motor, including an external rotor and multiple modular T-shaped stators. The T-shaped segmented iron core is made of soft magnetic composite material processed by powder metallurgy. The T-shaped segmented iron core has two axial stator teeth and a central radial stator tooth. This invention can improve the utilization rate of the winding ends and improve torque quality, but the saturation magnetic induction intensity of the motor is relatively low. Summary of the Invention

[0009] This invention provides a water-cooled four-rotor hybrid flux hub motor, comprising: a U-shaped segmented iron core, four stators, four rotors, a water-cooling structure, and a main shaft. The U-shaped segmented iron core adopts both I-shaped and arc-shaped silicon steel laminated structures, and multiple U-shaped segmented iron cores are combined circumferentially to form a four-stator core. The four stators include: a radial outer stator, a radial inner stator, an axial left stator, and an axial right stator, with excitation windings respectively provided on the radial inner stator and the axial left and right stators. The four rotors include: a radial outer rotor, a radial inner rotor, an axial left rotor, and an axial right rotor. The four stators and four rotors are configured with a double radial and axial-radial hybrid flux structure. A circumferential double helical water channel is provided on the end face of the radial outer stator core, a circumferential triple helical water channel is provided on the end face of the radial inner stator core, and water-cooling pipes are provided in the axial stator slots. The water-cooled four-rotor hybrid flux hub motor features an optimized topology, which improves power density and torque density. The water-cooling structure also enhances the motor's heat dissipation performance, durability, and reliability.

[0010] The four stators and four rotors are configured as follows: radial inner stator teeth → air gap → radial inner rotor → adjacent radial inner rotor → air gap → adjacent radial inner stator teeth → middle of adjacent radial outer stator teeth → air gap → adjacent radial outer rotor → radial outer rotor → air gap → middle of radial outer stator teeth → radial inner stator teeth.

[0011] The axial-radial hybrid flux structure of the four stators and the four rotors is set as follows: axial left (right) stator teeth → radial outer stator teeth left (right) side → air gap → radial outer rotor → axial left (right) rotor → air gap → axial left (right) stator teeth.

[0012] The water cooling channel is set as follows: spindle inlet → radial inner stator core left end face circumferential triple spiral water channel inlet (radial inner stator core right end face circumferential triple spiral water channel inlet uses the radial inner stator core to set up a water channel and then connects to the spindle inlet) → radial inner stator core left (right) end face circumferential triple spiral water channel → axial left (right) stator slot water cooling pipe inner end inlet → axial left (right) stator slot water cooling pipe outer end outlet → radial outer stator core left (right) end face circumferential double spiral water channel inlet → radial outer stator core left (right) end face circumferential double spiral water channel outlet → axial left (right) stator slot water cooling pipe outer end inlet → axial left stator slot water cooling pipe inner end outlet (axial right stator slot water cooling pipe inner end outlet uses the radial inner stator core to set up a water channel and then connects to the spindle outlet pipe) → spindle outlet pipe.

[0013] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0014] A water-cooled four-rotor hybrid flux hub motor includes: a U-shaped segmented iron core, four stators, four rotors, a water-cooling structure, and a main shaft; the U-shaped segmented iron core is arranged using I-shaped and arc-shaped silicon steel laminations, and multiple U-shaped segmented iron cores are combined circumferentially to form a four-stator core; the four stators include: a radial outer stator, a radial inner stator, an axial left stator, and an axial right stator; the four rotors include: a radial outer rotor, a radial inner rotor, an axial left rotor, and an axial right rotor; the radial outer rotor core and the axial left and right rotor cores are arranged in an arc-shaped connected structure, and the four rotor cores are connected into an integral structure by a frame; the four stators and the four rotors are arranged in a double radial and axial-radial hybrid flux structure; the water-cooling structure includes: water-cooling pipes in the axial left and right stator slots, circumferential double helical water channels on the left and right end faces of the radial outer stator core, and circumferential triple helical water channels on the left and right end faces of the radial inner stator core. The water-cooled four-rotor hybrid flux hub motor features an optimized topology, which improves power factor, efficiency, and torque density; the water-cooling structure also provides effective heat dissipation.

[0015] Preferably, the ╬-shaped segmented iron core includes four stator teeth: a radially outer stator tooth, a radially inner stator tooth, an axially left stator tooth, and an axially right stator tooth; the iron core between the middle of the radially outer stator tooth and the radially inner stator tooth is an I-shaped silicon steel laminate structure, forming the dual-radial hybrid magnetic flux structure; the iron cores between the left and right sides of the radially outer stator tooth and the axially left and right stator teeth are respectively an arc-shaped silicon steel laminate structure, forming the axial-radial hybrid magnetic flux structure. By adopting the ╬-shaped segmented iron core structure, the internal magnetic resistance of the iron core is reduced, which can improve the problem of magnetic yoke saturation under high-load conditions of the motor, enabling high power and high efficiency.

[0016] Preferably, the excitation winding adopts at least one of the following three models: (1) The excitation winding includes: a radial inner stator winding, an axial left stator winding, and an axial right stator winding; the radial inner stator winding and the I-shaped silicon steel lamination structure are used to provide the dual radial mixed magnetic flux between the middle of the radial outer stator and the radial inner stator; the axial left and right stator windings and the arc-shaped silicon steel lamination structure are used to provide the axial-radial mixed magnetic flux between the left and right sides of the radial outer stator and the axial left and right stators, respectively; (2) The excitation winding includes: a radial outer stator winding, an axial left stator winding, and an axial right stator winding; the radial outer stator winding and the I-shaped silicon steel lamination structure are used to provide the dual radial mixed magnetic flux between the middle of the radial outer stator and the radial inner stator; the radial outer stator winding, the axial left and right stator windings and the arc-shaped silicon steel lamination structure are used to provide the axial-radial mixed magnetic flux between the left and right sides of the radial outer stator and the axial left and right stators, respectively; (3) The excitation winding includes: a radial outer stator winding, a radial inner stator winding, an axial left stator winding, and an axial right stator winding; the radial outer stator winding, the radial inner stator winding, and the I-shaped silicon steel lamination structure are used to provide the dual radial mixed magnetic flux between the middle of the radial outer stator and the radial inner stator; the radial outer stator winding, the axial left and right stator windings, and the arc-shaped silicon steel lamination structure are used to provide the axial-radial mixed magnetic flux between the left and right sides of the radial outer stator and the axial left and right stators, respectively.

[0017] Preferably, referring to the excitation winding model (1), the axial left and right stator slots are provided with water-cooled pipes, and the axial left and right stator slot water-cooled pipes are respectively provided with inner end inlet and outlet and outer end inlet and outlet; the inner end inlet of the axial left and right stator slot water-cooled pipes is respectively connected to the outlet of the circumferential triple spiral water channel on the left and right end faces of the radial inner stator core, the inner end outlet of the axial left stator slot water-cooled pipe is connected to the main shaft outlet pipe, and the inner end outlet of the axial right stator slot water-cooled pipe is connected to the main shaft outlet pipe through the water channel set by the radial inner stator core; the outer end outlet and inlet of the axial left and right stator slot water-cooled pipes are respectively connected to the inlet and outlet of the circumferential double spiral water channel on the left and right end faces of the radial outer stator core; the axial left and right stator slot water-cooled pipes adopt an aluminum alloy structure. The water-cooling pipe is installed in the stator slot, which can connect the radial inner stator core end face spiral water channel and the radial outer stator core end face spiral water channel, and improve the heat dissipation effect of the axial excitation winding.

[0018] Preferably, referring to the excitation winding model (1), circumferential double-helix water channels are provided on the left and right end faces of the radial outer stator core. These circumferential double-helix water channels are respectively located on the left and right end faces of the radial outer stator core and are closely attached to the top of the outer rings of the axial left and right stator windings. The circumferential double-helix water channels on the left and right end faces of the radial outer stator core are provided with inlets and outlets, which are respectively connected to the outer end outlets and inlets of the axial left and right stator slot water-cooling pipes. The circumferential double-helix water channels on the left and right end faces of the radial outer stator core are constructed of aluminum alloy. By providing the circumferential double-helix water channels on the end faces of the radial outer stator core, water cooling can be applied to the end faces of the radial outer stator core and the outer ring end faces of the axial left and right stator windings, thereby improving the cooling effect.

[0019] Preferably, referring to the excitation winding model (1), the radial inner stator core has circumferential triple helical channels on its left and right end faces. These channels are respectively located at the top of the winding on the left and right end faces of the radial inner stator core and are closely attached to the inner rings of the axial left and right stator cores. The radial inner stator core has inlets and outlets on its left and right end faces. The inlet of the triple-helix water channel is connected to the main shaft water inlet pipe. The circumferential triple-helix water channel inlet on the right end face of the radial inner stator core is connected to the main shaft water inlet pipe via a water channel set on the radial inner stator core. The outlets of the circumferential triple-helix water channels on the left and right end faces of the radial inner stator core are respectively connected to the inner end inlets of the axial left and right stator wire groove water cooling pipes. The circumferential triple-helix water channels on the left and right end faces of the radial inner stator core are made of aluminum alloy. The circumferential triple-helix water channel set on the end face of the radial inner stator core can provide water cooling for the inner rings of the axial left and right stator cores and the end face of the radial inner stator winding, thereby improving the cooling effect.

[0020] Preferably, each of the four rotor cores is equipped with a permanent magnet. The four rotor cores are fixed to a four-rotor frame. The left and right side frames of the four rotors are connected to the main shaft via bearings. The radial inner rotor frame of the four rotor frame is also connected to the main shaft via bearings. The three bearings connecting the four rotor frame to the main shaft are configured as follows: the outer ring rotates while the inner ring remains stationary. This four-rotor structure improves power density.

[0021] Preferably, the left support of the fourth stator is fixed on the main shaft, and the right support of the fourth stator is connected to the radial inner rotor frame via a bearing. The bearing connecting the radial inner rotor frame is configured as a bearing structure where the outer ring is stationary and the inner ring rotates. The main shaft is a hollow main shaft, which is used to connect the circuit and water circuit. This four-stator structure design simplifies the structure and improves its dynamic stability. Attached Figure Description

[0022] Figure 1 Schematic diagram of a water-cooled four-rotor hybrid flux hub motor; Figure 2 Schematic diagram of the ╬-shaped segmented iron core structure; Figure 3 Schematic diagram of the four-stator structure and the radial outer stator double-helix waterway structure; Figure 4 Schematic diagram of the four stator supports and inner rotor structure; Figure 5 Schematic diagram of the axial left and right stator groove spiral pipe structure.

[0023] Numbering on the map: 1-Main shaft; 2-Main shaft inlet; 3-Radial inner stator core left and right end faces circumferential triple helical water channels; 4-Axial left stator winding; 5-Axial left rotor; 6-Radial inner stator core left and right end faces circumferential triple helical water channel inlet; 7-Axial left stator; 8-Radial outer stator core left and right end faces circumferential double helical water channels; 9-Four-rotor core; 10-1-Outer rotor support; 10-2-Radial inner rotor support; 11-Radial outer rotor; 12-Radial outer stator; 13-Radial inner stator; 14-Radial inner rotor; 15-╬-shaped segmented iron core; 16-1-I-shaped silicon steel lamination; 16-2-Arc-shaped silicon steel lamination; 17-Axial right stator; 18-Axial right stator winding; 19-Axial right rotor; 20-Radial inner stator winding; 21-Main shaft water outlet pipe; 22-1-Radial inner rotor bearing; 22-2-Stator right support bearing; 22-3-Rotor left and right side frame bearings ; 23-Radial outer stator core left and right end faces circumferential double helix water inlet; 24-Radial outer stator core left and right end faces circumferential double helix water outlet; 25-Four stator left and right side supports; 26-Axial left stator tooth; 27-Radial outer stator tooth; 28-Axial right stator tooth; 29-Radial inner stator tooth; 30-Axial left and right stator cable tray water cooling pipe inner end inlet (radial inner stator core end face circumferential triple helix water outlet); 3 1- Axial left and right stator cable slot water-cooled pipe inner end outlet (spindle water outlet); 32- Axial left and right stator cable slot water-cooled pipe outer end outlet (radial outer stator core left and right end face circumferential double spiral water channel inlet); 33- Axial left and right stator cable slot water-cooled pipe outer end inlet (radial outer stator core left and right end face circumferential double spiral water channel outlet); 34- Axial left stator cable slot water-cooled pipe; 35- Axial right stator cable slot water-cooled pipe. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments: See Figure 1 . Figure 5 A water-cooled four-rotor hybrid flux hub motor mainly includes: a U-shaped segmented iron core 15, four stators 7, 12, 13, 17, four rotors 5, 11, 14, 19, water-cooling structures 3, 8, 34, 35, and a main shaft 1; the U-shaped segmented iron core 15 is configured using I-shaped 16-1 and arc-shaped silicon steel laminations 16-2. Figure 1 Multiple ╬-shaped segmented iron cores 15 are combined circumferentially to form four stator cores 7, 12, 13, and 17. Figure 1 The four stators 7, 12, 13, and 17 include: a radial outer stator 12, a radial inner stator 13, an axial left stator 7, and an axial right stator 17. Figure 1The four rotors 5, 11, 14, and 19 include: a radial outer rotor 11, a radial inner rotor 14, an axial left rotor 5, and an axial right rotor 19; the core of the radial outer rotor 11 and the cores of the axial left and right rotors 5 and 19 are arranged in an arc-shaped communication structure, and the cores of the four rotors 5, 11, 14, and 19 are connected into an integral structure by frames 10-1 and 10-2; the four stators 7, 12, 13, and 17 and the four rotors 5, 11, 14, and 19 are arranged in a double radial and axial-radial hybrid magnetic flux structure. Figure 1 The water-cooled structures 3, 8, 34, and 35 ( Figure 1 . Figure 5 The system includes: axial left and right stator slot water-cooling pipes 34 and 35; radial outer stator core left and right end faces circumferential double helical water channels 8; radial inner stator core left and right end faces circumferential triple helical water channels 3; and a water inlet pipe 2 and a water outlet pipe 21 inside the main shaft 1. The water-cooled four-rotor hybrid flux hub motor features an optimized topology, improving power factor, efficiency, and torque density; the water-cooling structures 3, 8, 34, and 35 effectively dissipate heat.

[0025] See Figure 1 . Figure 3 The dual radial mixed magnetic flux loop of the four stators 7, 12, 13, 17 and the four rotors 5, 11, 14, 19 is set as follows: radial inner stator tooth 29 → air gap → radial inner rotor 14 → adjacent radial inner rotor → air gap → adjacent radial inner stator tooth → middle of adjacent radial outer stator tooth → air gap → adjacent radial outer rotor → radial outer rotor 11 ( Figure 1 → Air gap → Radial outer stator tooth 27 middle section → Radial inner stator tooth 29 ( Figure 3 ).

[0026] See Figure 1 . Figure 3 The axial-radial hybrid flux structure of the four stators 7, 12, 13, 17 and the four rotors 5, 11, 14, 19 is set as follows: axial left (right) stator teeth 26 (28) → radial outer stator teeth 27 left (right) side ( Figure 3 → Air gap → Radial outer rotor 11 → Axial left (right) rotor 5 (19) ( Figure 1 → Air gap → Axial left (right) stator teeth 26 (28) Figure 3 ).

[0027] See Figure 1 . Figure 3 . Figure 5The water cooling channel is set as follows: spindle inlet pipe 2 → radial inner stator core left end face circumferential triple spiral water channel inlet 6 (radial inner stator core right end face circumferential triple spiral water channel inlet 6 utilizes the radial inner stator 13 core to set up a water channel and then connects to spindle inlet pipe 2) → radial inner stator core left (right) end face circumferential triple spiral water channel 3 ( Figure 1 → Axial left (right) stator cable tray water-cooled pipe inner end inlet 30 → Axial left (right) stator cable tray water-cooled pipe outer end outlet 32 Figure 5 → Radial outer stator core left (right) end face circumferential double helix water channel inlet 23 → Radial outer stator core left (right) end face circumferential double helix water channel outlet 24 Figure 3 → Axial left (right) stator cable tray water-cooled pipe outer end inlet 33 → Axial left stator cable tray water-cooled pipe inner end outlet 31 ( Figure 5 (The water outlet 31 at the inner end of the axial right stator cable slot water-cooled pipe is connected to the spindle water outlet pipe 21 by setting up a water channel using the radial inner stator 13 iron core) → spindle water outlet pipe 21 ( Figure 1 ).

[0028] See Figure 2 The ╬-shaped segmented iron core 15 includes four stator teeth: radial outer stator teeth 27, radial inner stator teeth 29, axial left stator teeth 26, and axial right stator teeth 28. The iron core between the middle of the radial outer stator teeth 27 and the radial inner stator teeth 29 is configured as an I-shaped silicon steel laminated structure 16-1, forming the dual radial hybrid magnetic flux structure. The iron cores between the left and right sides of the radial outer stator teeth 27 and the axial left and right stator teeth 26 and 28 are respectively configured as arc-shaped silicon steel laminated structures 16-2, forming the axial-radial hybrid magnetic flux structure. By adopting the ╬-shaped segmented iron core 15 structure, the internal magnetic resistance of the iron core is reduced, which can improve the problem of magnetic yoke saturation under high load conditions of the motor, enabling high power and high efficiency.

[0029] See Figure 1 The excitation winding adopts at least one of the following three models: (1) The excitation winding includes: a radial inner stator winding 20, an axial left stator winding 4, and an axial right stator winding 18; the radial inner stator winding 20 and the I-shaped silicon steel lamination structure 16-1 provide the dual radial mixed magnetic flux between the middle of the radial outer stator 12 and the radial inner stator 13; the axial left and right stator windings 4 and 18 and the arc-shaped silicon steel lamination structure 16-2 provide the axial-radial mixed magnetic flux between the left and right sides of the radial outer stator 12 and the axial left and right stators 7 and 17, respectively; (2) The excitation winding includes: a radial outer stator winding, an axial left stator winding 4 and an axial right stator winding 18; the radial outer stator winding and the I-shaped silicon steel lamination structure 16-1 are used to provide the dual radial mixed magnetic flux between the middle of the radial outer stator 12 and the radial inner stator 13; the radial outer stator winding, the axial left and right stator windings 4 and 18 and the arc-shaped silicon steel lamination structure 16-2 are used to provide the axial-radial mixed magnetic flux between the left and right sides of the radial outer stator 12 and the axial left and right stators 7 and 17 respectively; (3) The excitation winding includes: a radial outer stator winding, a radial inner stator winding 20, an axial left stator winding 4, and an axial right stator winding 18; the radial outer stator winding, the radial inner stator winding 20, and the I-shaped silicon steel lamination 16-1 are used to provide the dual radial mixed magnetic flux between the middle of the radial outer stator 12 and the radial inner stator 13; the radial outer stator winding, the axial left and right stator windings 4 and 18, and the arc-shaped silicon steel lamination structure 16-2 are used to provide the axial-radial mixed magnetic flux between the left and right sides of the radial outer stator 12 and the axial left and right stators 7 and 17, respectively.

[0030] See Figure 1 . Figure 3 . Figure 5 Referring to the excitation winding model (1), water-cooled pipes 34 and 35 are provided in the axial left and right stator slots. The water-cooled pipes 34 and 35 in the axial left and right stator slots are respectively provided with an inner end inlet 30 and an outlet 31 and an outer end inlet 33 and an outlet 32. Figure 5 The inner end inlets 30 of the axial left and right stator slot water-cooling pipes 34 and 35 are respectively connected to the circumferential triple spiral water channel outlets 30 on the left and right end faces of the radial inner stator core. The inner end outlets 31 of the axial left stator slot water-cooling pipes 34 and 35 are connected to the main shaft water outlet pipe 21. The inner end outlet 31 of the axial right stator slot water-cooling pipe is connected to the main shaft water outlet pipe 21 via a water channel set in the radial inner stator 13 core. Figure 1 The outer end outlets 32 and inlets 33 of the axial left and right stator cable slot water-cooled pipes 34 and 35 are respectively connected to the inlets 23 and outlets 24 of the radial outer stator 12 core's left and right end faces of the circumferential double spiral water channel. Figure 3 The axial left and right stator slot water-cooling pipes 34 and 35 are made of aluminum alloy. The water-cooling pipes 34 and 35 are installed in the axial left and right stator slots, connecting the circumferential triple-helix water channels 3 on the left and right end faces of the radial inner stator 13 core and the circumferential double-helix water channels 8 on the left and right end faces of the radial outer stator 12 core. Figure 1 This also improves the heat dissipation effect of the left and right stator excitation windings 4 and 18 along the axis.

[0031] See Figure 1 . Figure 3 . Figure 5 Referring to the excitation winding model (1), circumferential double helical channels 8 are provided on the left and right end faces of the radial outer stator 12 core. The circumferential double helical channels 8 on the left and right end faces of the radial outer stator 12 core are respectively provided on the left and right end faces of the radial outer stator 12 core, and are closely attached to the top of the outer rings of the axial left and right stator windings 4 and 18. Figure 1 The radial outer stator 12 core has a double helical water channel 8 on its left and right end faces with an inlet 23 and an outlet 24. Figure 3 The inlet 23 and the outlet 24 are respectively connected to the outer end outlet 32 ​​and inlet 33 of the axial left and right stator cable groove water-cooled pipes. Figure 5 The radial outer stator 12 core's left and right end faces of the circumferential double helix water channels 8 are made of aluminum alloy. The circumferential double helix water channels 8, located on the end faces of the radial outer stator 12 core, allow for water cooling of the radial outer stator 12 core end faces and the outer ring end faces of the axial left and right stator windings 4 and 18. Figure 1 This improves its cooling effect.

[0032] See Figure 1 . Figure 5 Referring to the excitation winding model (1), circumferential triple helical channels 3 are provided on the left and right end faces of the radial inner stator 13 core. The circumferential triple helical channels 3 on the left and right end faces of the radial inner stator 13 core are respectively located on the top of the winding 20 on the left and right end faces of the radial inner stator 13 core, and are closely attached to the inner rings of the axial left and right stator 7 and 17 cores. Figure 1 The radial inner stator 13 core has a radial triple helical water channel 3 on its left and right end faces, which is respectively provided with an inlet 6 and an outlet 30. Figure 1 . Figure 5 The inlet 6 of the circumferential triple spiral water channel on the left end face of the radial inner stator 13 core is connected to the main shaft water inlet pipe 2. The inlet 6 of the circumferential triple spiral water channel on the right end face of the radial inner stator 13 core utilizes the water channel set by the radial inner stator 13 core to connect to the main shaft water inlet pipe 2. The outlets of the circumferential triple spiral water channels 3 on the left and right end faces of the radial inner stator 13 core are respectively connected to the inner end inlets 30 of the axial left and right stator wire groove water cooling pipes. Figure 1 . Figure 5 The radial inner stator 13 core's left and right end faces of the circumferential triple helix water channel 3 are made of aluminum alloy. The circumferential triple helix water channel 3, provided on the end face of the radial inner stator 13 core, allows for water cooling of the inner rings of the axial left and right stator cores 7 and 17, as well as the end face of the radial inner stator winding 20. Figure 1 This improves its cooling effect.

[0033] See Figure 1 The four rotor cores 9 are each equipped with permanent magnets. The four rotor cores 9 are fixed to the four rotor frames 10-1 and 10-2. The left and right side frames 10-1 of the four rotors are connected to the main shaft 1 via bearings 22-3. The radial inner rotor frame 10-2 of the four rotor frames 10-1 and 10-2 is connected to the main shaft 1 via bearings 22-1. The three bearings 22-1 and 22-3 connecting the four rotor frames 10-1 and 10-2 to the main shaft are configured as follows: the outer ring rotates while the inner ring remains stationary. Using the four rotor 5, 11, 14, and 19 structure can improve power density.

[0034] See Figure 1 . Figure 4 The left side bracket 25 of the four stators 7, 12, 13, and 17 is fixed on the main shaft 1. Figure 1 . Figure 4 The right-side bracket 25 of the fourth stator is connected to the radial inner rotor frame 10-2 via bearing 22-2, and the bearing 22-2 connecting the radial inner rotor frame 10-2 ( Figure 4 The bearing is designed as a 22-2 structure with a stationary outer ring and a rotating inner ring; the main shaft 1 is a hollow main shaft, used to connect the circuit and water circuit. The design employs the four stators 7, 12, 13, and 17. Figure 1 This simplifies the structure and improves its dynamic stability.

Claims

1. A water-cooled four-rotor hybrid flux hub motor, comprising: ╬-shaped segmented iron core, four stators, four rotors, water-cooled structure, main shaft; The ╬-shaped segmented iron cores are constructed using I-shaped and arc-shaped silicon steel laminations, and multiple ╬-shaped segmented iron cores are combined circumferentially to form a four-stator iron core. The four stators include: a radial outer stator, a radial inner stator, an axial left stator, and an axial right stator. The four rotors include: a radial outer rotor, a radial inner rotor, an axial left rotor, and an axial right rotor. The radial outer rotor iron core and the axial left and right rotor iron cores are configured with an arc-shaped connecting structure, and the four rotor iron cores are connected into an integral structure using a frame. The four stators and the four rotors are configured with a double radial and axial-radial hybrid magnetic flux structure. The water-cooling structure includes: axial left and right stator slotted water-cooling pipes, circumferential double helical water channels on the left and right end faces of the radial outer stator iron core, and circumferential triple helical water channels on the left and right end faces of the radial inner stator iron core.

2. The water-cooled four-rotor hybrid flux hub motor as described in claim 1, characterized in that: The ╬-shaped segmented iron core includes four stator teeth: radial outer stator teeth, radial inner stator teeth, axial left stator teeth, and axial right stator teeth; the iron core between the middle of the radial outer stator teeth and the radial inner stator teeth is a type I silicon steel laminate structure, forming the dual radial hybrid magnetic flux structure; the iron core between the left and right sides of the radial outer stator teeth and the axial left and right stator teeth is respectively an arc-shaped silicon steel laminate structure, forming the axial-radial hybrid magnetic flux structure.

3. The water-cooled four-rotor hybrid flux hub motor as described in claim 2, characterized in that: The excitation winding adopts at least one of the following three models: (1) The excitation winding includes: a radial inner stator winding, an axial left stator winding, and an axial right stator winding; the radial inner stator winding and the I-shaped silicon steel lamination structure are used to provide the dual radial mixed magnetic flux between the middle of the radial outer stator and the radial inner stator; the axial left and right stator windings and the arc-shaped silicon steel lamination structure are used to provide the axial-radial mixed magnetic flux between the left and right sides of the radial outer stator and the axial left and right stators, respectively; (2) The excitation winding includes: a radial outer stator winding, an axial left stator winding, and an axial right stator winding; the radial outer stator winding and the I-shaped silicon steel lamination structure are used to provide the dual radial mixed magnetic flux between the middle of the radial outer stator and the radial inner stator; the radial outer stator winding, the axial left and right stator windings and the arc-shaped silicon steel lamination structure are used to provide the axial-radial mixed magnetic flux between the left and right sides of the radial outer stator and the axial left and right stators, respectively; (3) The excitation winding includes: a radial outer stator winding, a radial inner stator winding, an axial left stator winding, and an axial right stator winding; the radial outer stator winding, the radial inner stator winding, and the I-shaped silicon steel laminations are used to provide the dual radial mixed magnetic flux between the middle of the radial outer stator and the radial inner stator; the radial outer stator winding, the axial left and right stator windings, and the arc-shaped silicon steel laminations are used to provide the axial-radial mixed magnetic flux between the left and right sides of the radial outer stator and the axial left and right stators, respectively.

4. The water-cooled four-rotor hybrid flux hub motor as described in claim 1 and claim 3 (1), characterized in that: Water-cooled pipes are installed in the left and right stator slots along the axial direction. These pipes are equipped with inner and outer inlets and outlets, respectively. The inner inlets of the water-cooled pipes are connected to the outlets of the circumferential triple-helix water channels on the left and right ends of the radial inner stator core, respectively. The inner outlet of the left stator slot water-cooled pipe is connected to the spindle outlet pipe. The inner outlet of the right stator slot water-cooled pipe is connected to the spindle outlet pipe via a water channel on the radial inner stator core. The outer outlets and inlets of the left and right stator slot water-cooled pipes are connected to the inlets and outlets of the circumferential double-helix water channels on the left and right ends of the radial outer stator core, respectively. The left and right stator slot water-cooled pipes are constructed of aluminum alloy.

5. The water-cooled four-rotor hybrid flux hub motor according to claim 1 and claim 3 (1) is characterized in that: the left and right end faces of the radial outer stator core are provided with circumferential double helical water channels, the circumferential double helical water channels of the left and right end faces of the radial outer stator core are respectively provided on the left and right end faces of the radial outer stator core and closely attached to the top of the outer ring of the left and right stator windings of the axial direction; the circumferential double helical water channels of the left and right end faces of the radial outer stator core are respectively provided with inlet and outlet, the inlet and outlet are respectively connected to the outlet and inlet of the outer end of the water-cooled pipe of the left and right stator wire groove of the axial direction; the circumferential double helical water channels of the left and right end faces of the radial outer stator core are made of aluminum alloy structure.

6. The water-cooled four-rotor hybrid flux hub motor as described in claim 1 and claim 3 (1), characterized in that: The radial inner stator core has circumferential triple helical water channels on its left and right end faces. These channels are located at the top of the windings on the left and right end faces of the radial inner stator core and are closely attached to the inner rings of the axial left and right stator cores. The radial inner stator core has inlets and outlets on its left and right end faces. The inlet of the radial inner stator core's circumferential triple helical water channel on its left end face is connected to the main shaft water inlet pipe. The inlet of the radial inner stator core's circumferential triple helical water channel on its right end face is connected to the main shaft water inlet pipe via the water channel on the radial inner stator core. The outlets of the radial inner stator core's circumferential triple helical water channels on its left and right end faces are connected to the inner inlets of the axial left and right stator wire groove water-cooling pipes. The radial inner stator core's circumferential triple helical water channels on its left and right end faces are constructed of aluminum alloy.

7. The water-cooled four-rotor hybrid flux hub motor as described in claim 1, characterized in that: The four rotor cores are each equipped with permanent magnets. The four rotor cores are fixed on the four rotor frame. The left and right frames of the four rotors are connected to the main shaft by bearings. The radial inner rotor frame of the four rotor frame is connected to the main shaft by bearings. The three bearings connecting the four rotor frame to the main shaft are configured as bearings with an outer ring that rotates and an inner ring that remains stationary.

8. The water-cooled four-rotor hybrid flux hub motor as described in claims 1 and 7, characterized in that: The left support of the four stators is fixed on the main shaft, and the right support of the four stators is connected to the radial inner rotor frame by bearings. The bearings connecting the radial inner rotor frame are configured as bearings with an outer ring that is stationary and an inner ring that rotates. The main shaft is a hollow main shaft, which is used to connect the circuit and water circuit.

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