Dual power self-coupled axial flux induction motor

Abstract

The application belongs to the technical field of electric machines, and particularly relates to a double-power self-coupling axial flux induction motor. The technical problem of low power density ratio in the prior art is solved, and the motor shell is arranged with a first stator assembly and a second stator assembly, a rotor magnetic yoke is arranged between the first stator assembly and the second stator assembly, a first rotor assembly and a second rotor assembly are respectively arranged between the rotor magnetic yoke and the first stator assembly and the second stator assembly, and the first rotor assembly and the second rotor assembly are fixedly installed on the same rotor magnetic yoke. The power density of the motor is greatly improved.

Description

Technical Field

[0001] This invention belongs to the field of motor technology, and particularly relates to a dual-power self-coupling axial flux induction motor. Background Technology

[0002] Axial flux motors are motors whose main magnetic field is along the axis of rotation, and they have the advantages of short axial length, light weight, and high torque density. In some specific applications, it is desirable to reduce the size of the motor while obtaining high output power, such as in electric transportation vehicles, where the motor acts as a driver and moves along with the vehicle body as a load. For example, Chinese patent literature discloses a motor rotor [CN201580079642.8], which includes a first stator and a second stator. The second stator is mirror-symmetrical to the first stator, such that a gap is formed between the first and second stators. A thin annular disc-shaped rotor is disposed in the gap, and the conductor bars together with the inner and outer peripheries form the cage winding of the rotor.

[0003] The above solutions have basically achieved the goal of increasing power density. However, while reducing the weight of the motor itself, they have not optimized the output power. In actual use of the motor, it is expected to obtain greater output power. Generally, this is achieved by increasing the stator in different directions and reducing leakage flux. Summary of the Invention

[0004] The purpose of this invention is to address the above-mentioned problems by providing a dual-power self-coupling axial flux induction motor that relatively reduces motor weight, thereby increasing motor output power and thus improving power density.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This dual-power self-coupling axial flux induction motor includes a motor housing, in which a first stator assembly and a second stator assembly are disposed. A rotor yoke is disposed between the first stator assembly and the second stator assembly. A first rotor assembly and a second rotor assembly are respectively disposed between the rotor yoke and the first stator assembly and the second stator assembly. The first rotor assembly and the second rotor assembly are fixedly mounted on the same rotor yoke. The rotor yoke is rotatably connected to the motor housing via a rotating shaft.

[0007] In the aforementioned dual-power self-coupled shaft flux induction motor, the rotor assembly includes an inner annular guide ring and an outer annular guide ring, and several spoke conductors are uniformly arranged between the inner annular guide ring and the outer annular guide ring.

[0008] In the aforementioned dual-power self-coupling axial flux induction motor, the spoke conductors are arranged radially, and the rotor yoke is provided with mounting slots corresponding to the spoke conductors, with the spoke conductors snapped into the mounting slots.

[0009] In the aforementioned dual-power self-coupled axial flux induction motor, the inner annular guide ring, the outer annular guide ring, and the spoke conductor are integrally formed, and the inner annular guide ring, the outer annular guide ring, and the rotating shaft are concentrically arranged.

[0010] In the aforementioned dual-power self-coupling axial flux induction motor, the rotor yoke has evenly distributed and radially arranged mounting slots at both ends, and the spoke conductors of the first rotor assembly and the second rotor assembly are respectively fixedly installed in the respective mounting slots.

[0011] In the aforementioned dual-power self-coupled axial flux induction motor, the rotor yoke is a cylindrical shape with open ends. A supporting inner core is provided in the middle of the inner cavity of the rotor yoke. The supporting inner core divides the inner cavity of the rotor yoke into a first inner ring cavity and a second inner ring cavity. The inner annular guide rings of the first rotor assembly and the second rotor assembly are respectively disposed in the first inner ring cavity and the second inner ring cavity.

[0012] In the aforementioned dual-power self-coupling axial flux induction motor, the inner core of the support is provided with several lightweight holes, the outer wall of the inner core is provided with several first positioning holes, and the rotor yoke is provided with a second positioning hole corresponding to the first positioning hole and penetrating the rotor yoke cylinder wall. The inner core of the support and the rotor yoke are positioned and connected through the first positioning hole and the second positioning hole.

[0013] In the aforementioned dual-power self-coupling axial flux induction motor, the stator assembly includes a stator yoke, which is disc-shaped. Several sets of stator guide bar assemblies are provided on the stator yoke, each consisting of guide bars. Adjacent guide bars in the same set are connected end-to-end to form a loop.

[0014] In the aforementioned dual-power self-coupling axial flux induction motor, the guide bar includes a first guide bar body and a second guide bar body arranged in a V-shape and symmetrically. The first guide bar body and the second guide bar body are respectively disposed on the first layer and the second layer. The first guide bar body passes through the second guide bar body in other stator guide bar assemblies and is connected to the first guide bar body. The first guide bar body and the second guide bar body are connected by connecting parts disposed at their two ends.

[0015] In the aforementioned dual-power self-coupling axial flux induction motor, a circulating water pump is driven and connected to the rotating shaft. The motor housing has several hot water intake channels near the inner wall of the motor housing and several heat dissipation channels near the outer wall of the motor housing. The hot water intake channels and the heat dissipation channels are connected in series through connecting channels on the end caps at both ends of the motor housing to form heat dissipation channels. The heat dissipation channels are connected to the circulating water pump, and a refrigerant replenishment port is provided on the heat dissipation channels or the circulating water pump.

[0016] Compared with existing technologies, the advantages of this invention are:

[0017] 1. The present invention provides two symmetrically arranged rotors between two symmetrically arranged stators, which is equivalent to the torque formed by two sets of stators and rotors being applied to the output shaft, greatly improving the output power. At the same time, compared with two axial flux motors, it saves the weight of at least one rotor yoke and two end covers, with only an increase in the axial direction of the motor housing, greatly improving the power density.

[0018] 2. Compared with motors where two rotors are subjected to the stator's magnetic field force on one side, this invention forms a common magnetic yoke between the two rotor components, creating a "sandwich" structure, which solves the technical defect of large magnetic pull between the stator and rotor.

[0019] 3. In this invention, the cooling medium exchanges heat with the motor through the inner heat exchange pipes, thereby cooling the motor. After the cooling medium heats up, it dissipates heat through the outer heat dissipation pipes, and then re-enters the heat exchange pipes, thus forming an internal circulation. In this cooling method, the temperature of the cooling medium in each heat exchange pipe is approximately equal, which can ensure that the motor temperature distribution is uniform and that the thermal expansion and contraction of each part of the motor are basically consistent, thus ensuring the output power and precision of the motor. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention;

[0021] Figure 2 This is a cross-sectional view of the present invention;

[0022] Figure 3 This is an exploded view of the present invention;

[0023] Figure 4 This is a schematic diagram of the rotor assembly structure provided by the present invention;

[0024] Figure 5 This is a schematic diagram of the rotor yoke structure provided by the present invention;

[0025] Figure 6 This is a schematic diagram of the stator structure provided by the present invention;

[0026] Figure 7 This is a schematic diagram of the guide bar assembly structure provided by the present invention;

[0027] Figure 8The schematic diagram of the hot water intake channel and heat dissipation channel provided by the present invention includes: motor housing 1, first stator assembly 2, second stator assembly 3, rotor yoke 4, first rotor assembly 5, second rotor assembly 6, shaft 7, rotor assembly 8, inner annular guide ring 9, outer annular guide ring 10, spoke conductor 11, mounting groove 12, supporting inner core 13, first inner ring cavity 14, second inner ring cavity 15, second positioning hole 16, stator assembly 17, stator yoke 18, stator guide bar assembly 19, guide bar 20, first guide bar body 21, second guide bar body 22, connecting part 23, circulating water pump 24, heat dissipation channel 25, hot water intake channel 26, connecting channel 27, and refrigerant replenishment port 28. Detailed Implementation

[0028] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0029] This dual-power self-coupling axial flux induction motor includes a motor housing 1, in which a first stator assembly 2 and a second stator assembly 3 are disposed. A rotor yoke 4 is disposed between the first stator assembly 2 and the second stator assembly 3. A first rotor assembly 5 and a second rotor assembly 6 are respectively disposed between the rotor yoke 4 and the first stator assembly 2 and the second stator assembly 3. The first rotor assembly 5 and the second rotor assembly 6 are fixedly mounted on the same rotor yoke 4. The rotor yoke 4 is rotatably connected to the motor housing 1 through a rotating shaft 7.

[0030] When the first stator assembly 2 is energized, a rotating magnetic field is generated. The first rotor assembly 4 cuts the magnetic field lines of the rotating magnetic field, inducing an asynchronous magnetic field and generating torque that acts on the shaft 7. Simultaneously, when the second stator assembly 3 is energized, a rotating magnetic field in the same direction as the first stator assembly 2 is generated. The second rotor assembly 5 cuts the magnetic field lines of the rotating magnetic field, inducing an asynchronous magnetic field and generating torque in the same direction as the first rotor assembly 4, acting on the shaft 7. The two torques are superimposed, greatly increasing the torque output on the shaft 7, equivalent to the power of two axial flux motors with magnetic fields on one side. However, compared to two flux induction motors, the weight of two end covers and one rotor yoke is reduced. Considering that the end cover installation requires a mounting part for the motor housing, the increase in material in the axial direction of the motor housing is negligible. This not only makes the motor structure more compact and enhances integration performance, but also greatly increases the power density, meeting the requirement of greater power output under the same mass. Compared to a motor with two rotors subjected to the magnetic field force of the stator on one side, the two rotor assemblies form a common magnetic yoke, creating a "sandwich" structure, which solves the technical defect of large magnetic pull between the stator and rotor.

[0031] Specifically, the rotor assembly 8 includes an inner annular guide ring 9 and an outer annular guide ring 10. Several spoke conductors 11 are evenly arranged between the inner annular guide ring 9 and the outer annular guide ring 10 to form a closed-loop squirrel-cage planar winding. When cutting the rotating magnetic field, an induced magnetic field is generated. The spoke conductors 11 are arranged radially and evenly to ensure that the generated induced magnetic field is uniform, preventing the torque direction from deviating due to uneven magnetic field, which could cause damage to the shaft and bearings and extend the motor life.

[0032] The inner annular guide ring 9, outer annular guide ring 10, and spoke conductor 11 are integrally formed. The motor rotor is a high-speed rotating component in the motor, requiring high strength. Integral forming avoids the problem of insufficient connection strength between the inner annular guide ring 9, outer annular guide ring 10, and spoke conductor 11. The inner annular guide ring 9, outer annular guide ring 10, and rotating shaft 7 are concentrically arranged, reducing vibration during high-speed rotation.

[0033] Furthermore, the rotor yoke 4 is cylindrical, and mounting grooves 12 corresponding to the spoke conductors 11 are respectively provided at both ends of the rotor yoke 4 near the first stator assembly 2 and the second stator assembly 3. The spoke conductors 11 are snapped into the mounting grooves 12. The spoke conductors 11 are supported by the mounting grooves 12, further improving the strength of the rotor assembly. Furthermore, the rotor yoke 4 has evenly distributed and radially arranged mounting grooves 12 at both ends, and each spoke conductor 11 in the first rotor assembly 5 and the second rotor assembly 6 is fixedly installed in the respective mounting grooves 12. The protrusions between the mounting grooves 12 are embedded between the two spoke conductors 11, and are magnetized after the rotor assembly receives the induced magnetic field, acting as an iron core to strengthen the magnetic field and further enhance the output power. The rotor yoke 4 is made of a soft magnetic material, such as silicon steel sheet.

[0034] Preferably, the rotor yoke 4 is a cylindrical shape with open ends. A supporting inner core 13 is disposed in the middle of the inner cavity of the rotor yoke 4, dividing the inner cavity of the rotor yoke 4 into a first inner ring cavity 14 and a second inner ring cavity 15. The inner annular guide rings 9 of the first rotor assembly 5 and the second rotor assembly 6 are respectively disposed in the first inner ring cavity 14 and the second inner ring cavity 15. The supporting inner core 13 is made of a non-magnetic material. This prevents magnetic field leakage from the shaft 7 and the supporting inner core 13 after the rotor yoke 4 is magnetized, thereby reducing or eliminating motor power.

[0035] Preferably, the inner support core 13 is provided with a plurality of lightweight holes, and the outer wall of the inner support core 13 is provided with a plurality of first positioning holes. The rotor yoke 4 is provided with a second positioning hole 16 corresponding to the first positioning holes 15, penetrating the cylindrical wall of the rotor yoke 4. The inner support core 13 and the rotor yoke 4 are positioned and connected through the first positioning holes 15 and the second positioning holes 16. This ensures a stable and effective connection between the rotor yoke 4 and the support base 13, preventing it from detaching from the shaft 7 and failing when the rotor yoke rotates at high speed.

[0036] Preferably, the stator assembly 17 includes a stator yoke 18, which is disc-shaped. Several sets of stator guide bar assemblies 19 are disposed on the stator yoke 18. Each stator guide bar assembly 19 includes guide bars 20, with adjacent guide bars 20 in the same group connected end-to-end to form a loop. Each guide bar 20 includes a first guide bar body 21 and a second guide bar body 22, arranged symmetrically in a V-shape. The first and second guide bar bodies 21 and 22 are respectively disposed on a first layer and a second layer. The first guide bar body 21 passes under the second guide bar body 22 in other stator guide bar assemblies 19 and connects to it. The first and second guide bar bodies 21 are connected by connecting portions 23 at their two ends. When energized, the guide bar assembly 19 generates a magnetic field, controlling the current direction to form a rotating magnetic field. Both the first and second guide bars 22 are flat, increasing the contact area with the stator yoke for effective heat dissipation and uniformly dissipating resistance across the cross-section, thus enhancing the magnetic field generated by the stator.

[0037] Preferably, a circulating water pump 24 is driven and connected to the rotating shaft 7. The cylinder body of the motor housing 1 is provided with several hot water intake channels 26 near the inner wall of the motor housing 1 and several heat dissipation channels 25 near the outer wall of the motor housing 1. The hot water intake channels 26 and the heat dissipation channels 25 are connected in series through connecting channels 27 on the end caps of both ends of the motor housing 1 to form a heat dissipation channel. The heat dissipation channel is connected to the circulating water pump 24, and a refrigerant replenishment port 28 is provided on the heat dissipation channel or the circulating water pump 24.

[0038] In this invention, the cooling medium exchanges heat with the motor through an inner heat exchange pipe, thus cooling the motor. After the cooling medium heats up, it dissipates heat through an outer heat dissipation pipe, and then re-enters the heat exchange pipe, forming an internal circulation. This cooling method ensures that the temperature of the cooling medium in each heat exchange pipe is approximately equal, thereby ensuring a uniform temperature distribution in the motor and making the thermal expansion and contraction of each part of the motor basically consistent, thus guaranteeing the output power and precision of the motor.

[0039] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

[0040] Although this document frequently uses terms such as motor housing 1, first stator assembly 2, second stator assembly 3, rotor yoke 4, first rotor assembly 5, second rotor assembly 6, shaft 7, rotor assembly 8, inner annular guide ring 9, outer annular guide ring 10, spoke conductor 11, mounting groove 12, supporting inner core 13, first inner ring cavity 14, second inner ring cavity 15, second positioning hole 16, stator assembly 17, stator yoke 18, stator guide bar assembly 19, guide bar 20, first guide bar body 21, second guide bar body 22, connecting part 23, circulating water pump 24, heat dissipation channel 25, hot water intake channel 26, connecting channel 27, refrigerant replenishment port 28, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of the invention; interpreting them as any additional limitation would contradict the spirit of the invention.

Claims

1. A dual-power self-coupling axial flux induction motor, comprising a motor housing (1), characterized in that, The motor housing (1) is provided with a first stator assembly (2) and a second stator assembly (3). A rotor yoke (4) is provided between the first stator assembly (2) and the second stator assembly (3). A first rotor assembly (5) and a second rotor assembly (6) are respectively provided between the rotor yoke (4) and the first stator assembly (2) and the second stator assembly (3). The first rotor assembly (5) and the second rotor assembly (6) are fixedly installed on the same rotor yoke (4). The rotor yoke (4) is rotatably connected to the motor housing (1) through a rotating shaft (7). The rotor yoke (4) is cylindrical, and mounting grooves (12) corresponding to the spoke conductors (11) are respectively provided at both ends of the rotor yoke (4) near the first stator assembly (2) and the second stator assembly (3). The rotor yoke (4) has evenly distributed and radially arranged mounting slots (12) at both ends. The spoke conductors (11) of the first rotor assembly (5) and the second rotor assembly (6) are respectively fixedly installed in the mounting slots (12). The rotor yoke (4) is a cylindrical shape with open ends. A supporting inner core (13) is provided in the middle of the inner cavity of the rotor yoke (4). The supporting inner core (13) divides the inner cavity of the rotor yoke (4) into a first inner ring cavity (14) and a second inner ring cavity (15). The first rotor assembly (5) and the second rotor assembly The inner annular guide ring (9) of component (6) is respectively set in the first inner ring cavity (14) and the second inner ring cavity (15). The supporting inner core (13) is made of non-magnetic material. The supporting inner core (13) is provided with several lightweight holes. The outer wall of the supporting inner core (13) is provided with several first positioning holes. The rotor yoke (4) is provided with a second positioning hole (16) that penetrates the cylinder wall of the rotor yoke (4) corresponding to the first positioning hole. The supporting inner core (13) and the rotor yoke (4) are positioned and connected through the first positioning hole and the second positioning hole (16).

2. The dual-power self-coupling axial flux induction motor according to claim 1, characterized in that, The rotor assembly (8) includes an inner annular guide ring (9) and an outer annular guide ring (10). A plurality of spoke conductors (11) are uniformly arranged between the inner annular guide ring (9) and the outer annular guide ring (10). The spoke conductors (11) are arranged radially and uniformly. The spoke conductors (11) are snapped into the mounting groove (12).

3. The dual-power self-coupling axial flux induction motor according to claim 2, characterized in that, The inner annular guide ring (9), the outer annular guide ring (10) and the spoke conductor (11) are integrally formed, and the inner annular guide ring (9), the outer annular guide ring (10) and the rotating shaft (7) are concentrically arranged.

4. The dual-power self-coupling axial flux induction motor according to claim 1, characterized in that, The stator assembly (17) includes a stator yoke (18), which is disc-shaped. Several sets of stator guide bar assemblies (19) are provided on the stator yoke (18). The stator guide bar assembly (19) includes guide bars (20), and adjacent guide bars (20) in the same set are connected end to end to form a loop.

5. The dual-power self-coupling axial flux induction motor according to claim 4, characterized in that, The guide bar (20) includes a first guide bar body (21) and a second guide bar body (22) arranged in a V shape and symmetrically. The first guide bar body (21) and the second guide bar body (22) are respectively arranged in the first layer and the second layer. The first guide bar body (21) passes through the second guide bar body (22) in the other stator guide bar assembly (19) and is connected to the first guide bar body (21). The first guide bar body (21) and the second guide bar body (22) are connected by connecting parts (23) arranged at both ends.

6. The dual-power self-coupling axial flux induction motor according to claim 1, characterized in that, A circulating water pump (24) is connected to the rotating shaft (7). The cylinder of the motor housing (1) is provided with several hot water intake channels (26) near the inner wall of the motor housing (1) and several heat dissipation channels (25) near the outer wall of the motor housing (1). The hot water intake channels (26) and the heat dissipation channels (25) are connected in series through the connecting channels (27) on the end caps of the motor housing (1) to form a heat dissipation channel. The heat dissipation channel is connected to the circulating water pump (24). A refrigerant replenishment port (28) is provided on the heat dissipation channel or the circulating water pump (24).

Images