Double-drive coaxial motor

Abstract

The invention relates to the technical field of motors, in particular to a double-drive coaxial motor which comprises a main drive motor, an auxiliary drive motor and a motor shell, the main drive motor is arranged at the front end of the motor shell, and the auxiliary drive motor is arranged at the rear end of the motor shell. The main driving motor and the auxiliary driving motor are coaxially connected through a main shaft and synchronously output power; the two ends of the motor shell are connected with a front end cover and a rear end cover respectively, the front end cover is provided with a main drive motor rotary transformer device, and the rear end cover is provided with an auxiliary drive motor rotary transformer device. Through the coaxial integrated design of the main drive motor and the auxiliary drive motor, dual-power superposition output is achieved under the same size, the torque and power density are remarkably improved, the main drive motor and the auxiliary drive motor share the same shell, rotating shaft and cooling system, the overall size and weight are greatly reduced, and the problem of space occupation of a traditional split type dual-motor system is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and particularly to a dual-drive coaxial motor. Background Art

[0002] With the development of modern electric technology, motors, as the core components in the power system, are widely used in various fields. Especially in application scenarios that require high power and high efficiency, as the core power components, the demand for motors is also increasing day by day, and it is necessary to meet the requirements of high power output, miniaturization, high efficiency, and high reliability.

[0003] Currently, in order to enhance the output power of motors, the produced motors often require a larger volume, a higher voltage, and a larger current. However, in the prior art, the increase in the volume, voltage, and current of motors is often accompanied by a decrease in efficiency and an increase in cost, which not only brings higher manufacturing costs but also has an adverse impact on the operating efficiency and stability of motors. To meet the growing demand for high-power motors, reduce the volume and weight of motors, and at the same time improve their efficiency and reduce costs, it is particularly important to develop a new type of motor structure. Summary of the Invention

[0004] The purpose of the present invention is to solve the problem in the prior art that in order to enhance the output power of motors, the produced motors often require a larger volume, a higher voltage, and a larger current, resulting in higher costs. A dual-drive coaxial motor is provided. Through the coaxial integration design of the main drive motor and the auxiliary drive motor, dual-power superposition output is achieved under the same volume, significantly improving torque and power density. The main and auxiliary motors share the same housing, rotating shaft, and cooling system, greatly reducing the overall volume and weight.

[0005] To achieve the above purpose, a dual-drive coaxial motor proposed by the present invention includes a main drive motor, an auxiliary drive motor, and a motor housing. The main drive motor is arranged at the front end of the motor housing, and the auxiliary drive motor is arranged at the rear end of the motor housing. The main drive motor and the auxiliary drive motor are coaxially connected through a main shaft and synchronously output power. Front end covers and rear end covers are respectively connected to both ends of the motor housing. A resolver device for the main drive motor is provided on the front end cover, and a resolver device for the auxiliary drive motor is provided on the rear end cover.

[0006] As a further description of the above technical solution: The main shaft is a stepped shaft structure, and both ends are fixedly connected to the rotors of the main drive motor and the auxiliary drive motor respectively, for synchronously transmitting torque and outputting composite power.

[0007] As a further description of the above technical solution: A three-phase wire outlet for the main drive motor is provided on the main drive motor, and a three-phase wire outlet for the auxiliary drive motor is provided on the auxiliary drive motor. The current control of the three-phase wire outlet for the main drive motor and the three-phase wire outlet for the auxiliary drive motor is independent of each other.

[0008] As a further description of the above technical solution: The joint surfaces of the front end cover and the rear end cover with the motor housing adopt a rabbet structure for positioning, and are waterproof and sealed and fixed through seals and bolts. A milling plane is provided on the front end cover, and threaded holes are provided in the plane for installing a waterproof and breathable valve.

[0009] As a further description of the above technical solution: A number of axially distributed and axially penetrating axial water channels are provided on the motor housing. A number of circumferentially distributed arc-shaped water channels are provided on both sides of the motor housing. The arc-shaped water channels connect adjacent axial water channels in series to form a cooling flow channel. An inlet and an outlet are provided on the motor housing.

[0010] As a further description of the above technical solution: The inlet and the outlet are respectively arranged on the axial water channels that are not connected by arc-shaped water channels on both sides. Water nozzles communicating with the inlet and the outlet respectively are provided on the motor housing. The water nozzles are used to connect to an external cooling system.

[0011] As a further description of the above technical solution: The axial water channels and the arc-shaped water channels are integrally formed inside the motor housing by an extrusion molding process to form a closed-loop cooling flow channel surrounding the stator assembly.

[0012] As a further description of the above technical solution: An interference fit is achieved between the motor housing and the stator assembly through a shrink fit sleeve. A through-hole threaded hole is provided on the inner wall of the motor housing, and radial positioning and fixing are carried out with the stator assembly through a set screw.

[0013] The above technical solution has the following advantages or beneficial effects:

[0014] 1. Through the coaxial integrated design of the main drive motor and the auxiliary drive motor, the present invention realizes the superimposed output of dual power under the same volume, significantly improves the torque and power density. The main and auxiliary motors share the same housing, rotating shaft and cooling system, greatly reducing the overall volume and weight, and solving the problem of space occupation of the traditional split dual-motor system.

[0015] 2. The closed-loop flow channel formed by the series connection of the axial water channels and the arc-shaped water channels covers the circumferential and axial directions of the motor housing. The coolant flow path is long and the coverage area is wide, significantly improving the heat dissipation efficiency. The inlet and the outlet are located at both ends of the axial water channels that are not connected by arc-shaped water channels, ensuring uniform flow of the coolant, avoiding local overheating, and prolonging the service life of the motor.

[0016] 3. The main and auxiliary motors are respectively configured with resolver devices and independent three-phase line outlet ports to realize independent control of the currents of the dual motors. The power distribution can be dynamically adjusted according to the load, reducing vibration and noise, and improving the running stability. The front and rear end covers and the motor housing are positioned by rabbets and connected by seals, enhancing the structural strength and preventing liquid leakage or airtightness failure caused by load deformation.

[0017] 4. The axial and arc-shaped water channels are integrally formed by extrusion, which simplifies the processing flow, reduces the manufacturing cost, and at the same time improves the finished product rate and the consistency of the heat dissipation structure. The stator assembly is fixed by set screws and expansion sleeves, and the front and rear end covers are connected by bolts, which is convenient for disassembly, maintenance or replacement of components, and reduces the later operation and maintenance costs.

[0018] 5. High-permeability iron cores and high-temperature-resistant insulating materials are adopted, combined with the waterproof and breathable valve design of the front end cover, to ensure the stable operation of the motor in harsh environments such as high temperature and high humidity. The stepped shaft and the threaded hole positioning design of the housing through-hole enhance the rigidity of the shaft and the coaxiality of the stator-housing, reducing the risk of mechanical deformation caused by load impact. Description of the Drawings

[0019] Figure 1 It is a schematic structural diagram of a dual-drive coaxial motor in an embodiment of the present invention;

[0020] Figure 2 It is an exploded view of a dual-drive coaxial motor in an embodiment of the present invention;

[0021] Figure 3 It is a side view of a dual-drive coaxial motor in an embodiment of the present invention Figure 1 ;

[0022] Figure 4 It is a side view of a dual-drive coaxial motor in an embodiment of the present invention Figure 2 ;

[0023] Figure 5 It is a sectional view of a dual-drive coaxial motor in an embodiment of the present invention Figure 1 ;

[0024] Figure 6 It is a sectional view of a dual-drive coaxial motor in an embodiment of the present invention Figure 2 。

[0025] Legend:

[0026] 1. Expansion sleeve; 2. Front end cover; 3. Main drive motor resolver device; 4. Main drive motor three-phase line outlet; 5. Main shaft; 6. Main drive motor; 7. Auxiliary drive motor; 8. Water inlet; 9. Water outlet; 10. Motor housing; 11. Auxiliary drive motor three-phase line outlet; 12. Rear end cover; 13. Auxiliary drive motor resolver device; 14. Sealing member; 15. Bolt; 16. Water nozzle; 17. Axial water channel; 18. Arc-shaped water channel; 19. Cooling flow channel. Detailed Embodiments

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0028] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "vertical", "upper", "lower", "horizontal", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0029] In the description of the present invention, it should also be noted that unless otherwise clearly defined and limited, the terms "set", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] Please refer to Figures 1-6 , the present invention provides a technical solution: A dual-drive coaxial motor of the present invention includes a main drive motor 6, an auxiliary drive motor 7, and a motor housing 10. The main drive motor 6 is arranged at the front end of the motor housing 10, and the auxiliary drive motor 7 is arranged at the rear end of the motor housing 10. The main drive motor 6 and the auxiliary drive motor 7 are coaxially connected through a main shaft 5 and output power synchronously; both ends of the motor housing 10 are respectively connected with a front end cover 2 and a rear end cover 12. A main drive motor resolver device 3 is provided on the front end cover 2, and an auxiliary drive motor resolver device 13 is provided on the rear end cover 12.

[0031] In the technical solution of the present invention, the main drive motor 6 and the auxiliary drive motor 7 are coaxially connected through the main shaft 5. The two operate synchronously inside the motor housing 10 and output power. During actual operation, the main drive motor 6 and the auxiliary drive motor 7 work together to provide composite power. When the load on the main drive motor 6 is large, the auxiliary drive motor 7 can provide support to ensure that the power output of the system is always stable. If the main drive motor 6 fails, the auxiliary drive motor 7 can operate independently, avoiding a complete shutdown of the system. The front end cover 2 and the rear end cover 12 are respectively provided with a resolver device 3 for the main drive motor and a resolver device 13 for the auxiliary drive motor. These resolver devices are used to adjust the rotation of the motor rotor to ensure accurate power output and stable operating conditions during motor operation. The main drive motor and the auxiliary drive motor are coaxially connected, reducing the occupied space. The motor housing 10 is designed compactly and is suitable for applications in equipment with high space requirements, especially in automated systems and compact equipment. Through the coaxial design of the main and auxiliary motors, without increasing the volume and weight, the power output and torque density of the motor are enhanced. Adopting a dual-drive motor structure can increase the power of the motor without increasing the current or voltage, while improving the cooling efficiency of the motor and enhancing the operating stability and reliability of the motor. Through the coaxial integrated design of the main drive motor 6 and the auxiliary drive motor 7, dual-power superimposed output is achieved in the same volume, significantly improving the torque and power density. The main and auxiliary motors share the same housing, rotating shaft, and cooling system, greatly reducing the overall volume and weight and solving the problem of space occupation of the traditional split dual-motor system.

[0032] Among them, the dual-motor design can, when the main drive motor fails, provide sufficient power support through the auxiliary drive motor 7 to avoid the shutdown of the entire system, enhancing the reliability and fault tolerance of the system, and is especially suitable for industrial applications that require high reliability. Since the outputs of the two motors are independent of each other, higher adaptability can be provided under different working conditions. For example, when the load on the main drive motor 6 is high, the auxiliary drive motor 7 can provide additional support to ensure the stable operation of the entire system.

[0033] As Figure 2 and Figure 5 shown, the main shaft 5 is a stepped shaft structure, and both ends are fixedly connected to the rotors of the main drive motor 6 and the auxiliary drive motor 7 respectively, for synchronously transmitting torque and outputting composite power; the stepped shaft structure of the main shaft 5 ensures the synchronous speed of the two motors, providing more stable output torque and power transmission. The two ends of the main shaft 5 are respectively connected to the rotors of the main drive motor 6 and the auxiliary drive motor 7, enabling the two motors to synchronously transmit torque, not only reducing the space occupation but also making the power output more balanced and avoiding possible power asymmetry problems.

[0034] As Figure 1 and Figure 2As shown, there is a three-phase wire outlet 4 of the main drive motor 6 on the main drive motor 6, and a three-phase wire outlet 11 of the auxiliary drive motor 7 on the auxiliary drive motor 7. The current control of the three-phase wire outlet 4 of the main drive motor and the three-phase wire outlet 11 of the auxiliary drive motor are independent of each other; the three-phase wire outlets 4 of the main drive motor 6 and the auxiliary drive motor 7 are respectively arranged on two motors, and the current control of the two is independent, which means that the drive systems of the two motors can be independently adjusted according to their respective working loads, optimizing the use of electrical energy and improving the flexibility and efficiency of the system. Each motor is connected to an external power supply through an independent three-phase wire outlet. The current control of the main drive motor 6 and the auxiliary drive motor 7 is completely independent and can be flexibly adjusted according to their respective load requirements, enabling the system to optimize the operating efficiency of the motor under different loads. The main and auxiliary motors are respectively equipped with resolver devices and independent three-phase wire outlets to achieve independent control of the currents of the two motors, and the power distribution can be dynamically adjusted according to the load, reducing vibration and noise and improving the running stability.

[0035] As Figure 1 and Figure 2 shown, the joint surfaces of the front end cover 2 and the rear end cover 12 with the motor housing 10 are positioned by a rabbet structure and are fixed by a waterproof seal through a seal 14 and bolts 15. The front end cover 2 is provided with a milled plane, and threaded holes are arranged in the plane to install a waterproof breather valve. The joint surfaces of the front end cover 2 and the rear end cover 12 with the motor housing 10 are positioned by a rabbet structure, which can ensure the precise docking between the cover and the housing and avoid seal failure or part loosening caused by assembly errors. The rabbet structure can provide a more stable joint surface, which helps to improve the overall assembly quality of the motor. The waterproof seal is fixed through the seal 14 and bolts 15. The role of the seal is to ensure that the inside of the motor is not invaded by external moisture, protect the electrical components of the motor, and extend the service life of the motor. The optimization of the sealing performance is very suitable for application environments that require waterproofing. The front end cover 2 is provided with a milled plane, which can provide a more flat and precise joint surface, ensure the accurate position of the waterproof breather valve during installation, and contribute to the stability and effectiveness of the breather valve. This milled plane design can reduce installation errors caused by surface unevenness and further improve the sealing performance. The setting of the waterproof breather valve can effectively provide air circulation between the inside and outside of the motor, help to discharge the moisture inside the motor, prevent internal pressure fluctuations caused by temperature changes, and avoid motor failures caused by water accumulation. This design improves the reliability of the motor during long-term use.

[0036] As Figure 1 and Figure 6As shown, there are several axially distributed axial water channels 17 that penetrate the axial direction of the motor housing 10. On both sides of the motor housing 10, there are several circumferentially distributed arc-shaped water channels 18. The arc-shaped water channels 18 connect adjacent axial water channels 17 in series to form a cooling flow path 19. An inlet 8 and an outlet 9 are provided on the motor housing 10. The combined design of the axial water channels 17 and the arc-shaped water channels 18 enables the coolant to flow along the axial and circumferential directions of the motor housing 10, forming a more comprehensive cooling channel. The coolant can flow through all parts of the motor more evenly, effectively reducing the temperature rise of the motor during high-load operation and ensuring the normal operation of the motor. The series design of the axial water channels and the arc-shaped water channels can form a relatively long flow path, and the coolant can fully absorb the heat generated by the motor during this process, improving the heat dissipation efficiency and avoiding local overheating. Through the arc-shaped water channels 18, multiple axial water channels 17 are connected in series to ensure a more continuous and smooth flow path of the coolant inside the motor housing 10. This series connection method can avoid the phenomenon of too fast or too slow local coolant flow rate, thereby improving the overall heat exchange effect. Compared with complex multi-layer cooling systems, this design can simplify the structure of the motor housing, improve production efficiency, and facilitate inspection and maintenance. The closed-loop flow path formed by the series connection of the axial water channels and the arc-shaped water channels covers the circumferential and axial directions of the motor housing. The coolant has a long flow path and a large coverage area, significantly improving the heat dissipation efficiency. The inlet and outlet are located at both ends of the axial water channels not connected by arc-shaped water channels, ensuring uniform coolant flow, avoiding local overheating, and prolonging the service life of the motor.

[0037] As Figure 1 and Figure 6As shown, the water inlet 8 and the water outlet 9 are respectively arranged on the axial water channel 17 that is not connected by the arc-shaped water channel 18 on both sides. The motor housing 10 is provided with water nozzles 16 that communicate with the water inlet 8 and the water outlet 9 respectively. The water nozzles 16 are used to connect to an external cooling system. The axial water channel 17 and the arc-shaped water channel 18 are integrally formed inside the motor housing 10 by an extrusion molding process to form a closed-loop cooling flow path 19 surrounding the stator assembly; the axial water channel 17 and the arc-shaped water channel 18 are integrally formed inside the motor housing by an extrusion molding process, ensuring the precise and stable structure of the cooling flow path, avoiding problems such as water leakage and interface loosening that may occur in traditional cooling systems, thereby improving the cooling effect. The closed-loop cooling flow path can ensure that the coolant flows in the motor housing to form a complete circulation path, reducing the loss of coolant, effectively improving the efficiency of heat exchange between the coolant and the motor surface, ensuring that the motor is evenly and continuously cooled during high-load operation, enabling the direct formation of the cooling flow path during the manufacturing of the motor housing, greatly reducing the complexity and cost of production. Integrating the cooling flow path directly into the motor housing eliminates the need for additional cooling components or complex pipeline layouts, thus saving the internal space of the motor, not only optimizing the overall structure of the motor but also making the motor more compact. The axial and arc-shaped water channels are integrally formed by extrusion, simplifying the processing process, reducing the manufacturing cost, and at the same time improving the finished product rate and the consistency of the heat dissipation structure.

[0038] As Figure 1 and Figure 2 shown, an interference fit is achieved between the motor housing 10 and the stator assembly through a shrink fit sleeve 1. The inner wall of the motor housing 10 is provided with a through-hole threaded hole, and radial positioning and fixing are carried out with the stator assembly through a set screw; achieving an interference fit between the motor housing 10 and the stator assembly through the shrink fit sleeve 1 can effectively ensure the tight combination between the two, thereby improving the stability of the stator in the motor housing 10 and reducing the risk of relative movement. This method is commonly used in occasions requiring high fixing force and seismic resistance. By setting a through-hole threaded hole on the inner wall of the motor housing 10 and using a set screw for radial positioning, the accurate position of the stator assembly in the motor housing 10 can be ensured, preventing the stator from shifting or vibrating during operation, thereby improving the performance and service life of the motor. Through the combination of the shrink fit sleeve 1 and the set screw, the motor assembly process can be simplified, avoiding complex welding or gluing processes. At the same time, the design of the set screw makes the installation and disassembly of the motor stator assembly more convenient, which is helpful for later maintenance. The double fixing method of interference fit and set screw can effectively reduce loosening caused by external factors such as vibration and temperature changes, improving the overall durability and stability of the motor. The stator assembly is fixed by a set screw and a shrink fit sleeve 1, and the front and rear end covers are bolted, which is convenient for disassembly, maintenance, or replacement of components, reducing the later operation and maintenance costs.

[0039] By means of a reasonable magnetic flux distribution, magnetic saturation phenomenon is reduced, ensuring a uniform magnetic field distribution to reduce iron loss. Optimize the geometries of the stator and rotor, such as the slot design of the stator and tooth profile optimization, etc., to reduce magnetic flux leakage, thereby reducing iron loss. Using materials with high magnetic permeability can effectively reduce hysteresis loss. In terms of material selection, the present invention adopts materials with high magnetic permeability and high-temperature resistant insulating materials, ensuring the stability and reliability of the motor during long-term operation, not only meeting the requirements of high power output, but also significantly improving in terms of efficiency, cost and reliability.

[0040] Working principle: Adopting a dual-drive motor structure can increase the power of the motor without increasing the current or voltage, while improving the cooling efficiency of the motor and enhancing the operation stability and reliability of the motor. Through the coaxial integrated design of the main drive motor 6 and the auxiliary drive motor 7, dual-power superposition output is achieved under the same volume, significantly improving the torque and power density. The main and auxiliary motors share the same housing, rotating shaft and cooling system, greatly reducing the overall volume and weight.

[0041] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not expressly listed, or elements inherent to such process, method, article or device.

[0042] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor limit the invention to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification to better explain the principle and practical application of the present invention, so that those skilled in the art can well understand and utilize the present invention. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A dual-drive coaxial motor, characterized in that, It includes a main drive motor (6), an auxiliary drive motor (7) and a motor housing (10). The main drive motor (6) is arranged at the front end of the motor housing (10), and the auxiliary drive motor (7) is arranged at the rear end of the motor housing (10). The main drive motor (6) and the auxiliary drive motor (7) are coaxially connected through a main shaft (5) and synchronously output power. Both ends of the motor housing (10) are respectively connected with a front end cover (2) and a rear end cover (12). A main drive motor resolver device (3) is provided on the front end cover (2), and an auxiliary drive motor resolver device (13) is provided on the rear end cover (12).

2. The dual-drive coaxial motor according to claim 1, wherein: The main shaft (5) has a stepped shaft structure and is fixedly connected to the rotors of the main drive motor (6) and the auxiliary drive motor (7) at both ends respectively, and is used to synchronously transmit torque and output composite power.

3. The dual-drive coaxial motor according to claim 1, wherein: A main drive motor three-phase wire outlet (4) is provided on the main drive motor (6), and an auxiliary drive motor three-phase wire outlet (11) is provided on the auxiliary drive motor (7). The current control of the main drive motor three-phase wire outlet (4) and the auxiliary drive motor three-phase wire outlet (11) is independent of each other.

4. The dual-drive coaxial motor according to claim 1, wherein: The joint surfaces of the front end cover (2) and the rear end cover (12) with the motor housing (10) are positioned by a rabbet structure and are waterproof and sealed and fixed through a seal (14) and bolts (15). A milling plane is provided on the front end cover (2), and threaded holes are arranged in the plane to install a waterproof breather valve.

5. The dual-drive coaxial motor according to claim 1, wherein: A plurality of axially distributed and axially penetrating axial water channels (17) are provided on the motor housing (10). A plurality of circumferentially distributed arc-shaped water channels (18) are provided on both sides of the motor housing (10). The arc-shaped water channels (18) connect adjacent axial water channels (17) in series to form a cooling flow channel (19). An inlet (8) and an outlet (9) are provided on the motor housing (10).

6. The dual-drive coaxial motor according to claim 5, wherein: The inlet (8) and the outlet (9) are respectively arranged on the axial water channels (17) that are not connected by arc-shaped water channels (18) on both sides. Water nozzles (20) communicated with the inlet (8) and the outlet (9) respectively are provided on the motor housing (10), and the water nozzles (20) are used to connect an external cooling system.

7. The dual-drive coaxial motor according to claim 5, wherein: The axial water channels (17) and the arc-shaped water channels (18) are integrally formed inside the motor housing (10) by an extrusion molding process to form a closed-loop cooling flow channel (19) surrounding the stator assembly.

8. The dual-drive coaxial motor according to claim 1, characterized in that: The motor housing (10) and the stator assembly are fixed by interference fit through a shrink fit sleeve (1). A through-hole threaded hole is provided on the inner wall of the motor housing (10), and radial positioning and fixing are carried out with the stator assembly through a set screw.

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