Double-stator composite structure motor and working method thereof

Abstract

The invention provides a double-stator composite structure motor and a working method thereof, and belongs to the technical field of motors, the double-stator composite structure motor comprises a casing, an outer stator, an outer salient pole rotor, an inner squirrel cage rotor, an inner stator and a rotating shaft are sequentially arranged in an inner cavity of the casing from outside to inside, and the two ends of the rotating shaft are rotationally fixed to the two ends of the casing respectively; the outer salient pole rotor is rotatably fixed in the casing, the inner squirrel cage rotor is fixedly connected with the rotating shaft, the outer stator and the inner stator are fixedly arranged in the casing, the outer stator and the outer salient pole rotor form an outer doubly salient permanent magnet motor, and the inner squirrel cage rotor and the inner stator form an inner asynchronous motor. According to the double-stator composite structure motor provided by the invention, the power density, the torque density and the efficiency of the composite structure motor are improved, the double-stator composite structure motor is suitable for high-speed running application occasions, and the cruising ability of a hybrid electric vehicle is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and particularly relates to a double-stator composite structure motor and a working method thereof, which are used in the field of hybrid electric vehicles. Background Art

[0002] A hybrid electric vehicle is a vehicle that adds a drive motor for auxiliary drive on the basis of a traditional fuel vehicle, and can improve the fuel economy and power performance of the vehicle. Currently, hybrid electric vehicles usually adopt two motors for driving. One motor is directly connected to an internal combustion engine and used as a generator, and the other motor is connected to a wheel drive system and used as a motor. With the development of technology and the higher pursuit of space utilization efficiency, a composite structure motor drive system has emerged. However, currently, the composite structure motors mainly consist of the combination of motors with the same structure, such as a composite flux-switching motor, a composite permanent magnet synchronous motor, etc.

[0003] However, whether it is a dual-motor drive or a composite motor drive with the same structure, there are problems of insufficient motor power density, torque density, and efficiency. Especially when the motor is working, the motor used as a motor only operates as a driving motor, and the motor used as a generator only charges the battery as a generator. When the vehicle faces complex road conditions, it cannot meet the high efficiency of driving in a timely manner. In addition, when the vehicle's battery is fully charged, the motor used as a generator temporarily stops working, and the efficiency of the motor is not fully utilized. In order to further improve the endurance and driving efficiency of the vehicle, and improve the motor efficiency, torque density, and power density, we propose a double-stator composite structure motor and a working method thereof. Summary of the Invention

[0004] The purpose of the present invention is to provide a double-stator composite structure motor and a working method thereof to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A double-stator composite structure motor of the present invention includes a housing. An outer stator, an outer salient pole rotor, an inner squirrel-cage rotor, an inner stator, and a rotating shaft are sequentially arranged in the inner cavity of the housing from outside to inside. Both ends of the rotating shaft are rotatably fixed at both ends of the housing, and the inner squirrel-cage rotor is fixedly connected to the rotating shaft;

[0007] The outer stator includes an outer stator core, outer stator permanent magnets, a DC excitation winding, and an outer stator winding. The outer stator core is provided with a plurality of salient poles, and the outer stator winding is wound around the salient poles. The outer stator permanent magnets and the DC excitation winding are both installed on the yoke portion of the outer stator core. The outer salient pole rotor includes an outer salient pole rotor core made of a magnetic conductive material. The inner squirrel-cage rotor includes an inner squirrel-cage rotor core and an inner squirrel-cage rotor winding, and the inner squirrel-cage rotor winding is wound around the inner squirrel-cage rotor core. The inner stator includes an inner stator core and an inner stator winding, and the inner stator winding is wound around the inner stator core.

[0008] The outer stator and the outer salient pole rotor form an outer doubly salient permanent magnet motor, and the inner squirrel-cage rotor and the inner stator form an inner asynchronous motor.

[0009] Further, the outer salient pole rotor is fixed on an outer salient pole rotor bracket, and a load is connected to one end of the outer salient pole rotor bracket passing through the machine housing.

[0010] Further, one output end of the rotating shaft is connected to an internal combustion engine, and the other output end of the rotating shaft is connected to a load.

[0011] Further, the outer stator core is a salient pole core, the number of salient poles of the outer stator core is 6, and the protruding direction of the salient poles of the outer stator core faces the side of the outer salient pole rotor.

[0012] Further, the outer salient pole rotor core is provided with a plurality of salient poles, the number of salient poles of the outer salient pole rotor core is 7, and the protruding direction of the salient poles of the outer salient pole rotor core faces the side of the outer stator.

[0013] Further, the outer stator permanent magnets are made of neodymium iron boron material, and the shape of the outer stator permanent magnets is a cuboid.

[0014] Further, the outer stator permanent magnets are axially magnetized, and the magnetization directions of two adjacent outer stator permanent magnets are opposite.

[0015] Further, a first air gap is provided between the inner squirrel-cage rotor and the inner stator, a second air gap is provided between the outer salient pole rotor and the inner squirrel-cage rotor, and a third air gap is provided between the outer stator and the outer salient pole rotor.

[0016] Further, the current directions passed through adjacent DC excitation windings are opposite.

[0017] The present invention also provides a working method for a dual-stator composite structure motor. Using the dual-stator composite structure motor described above, when the battery of a hybrid vehicle needs to be charged, the rotating shaft is disconnected from the load and connected to the internal combustion engine. The internal combustion engine drives the internal asynchronous motor to charge the battery, and the internal asynchronous motor operates as a generator; when the battery of the hybrid vehicle does not need to be charged, the rotating shaft is disconnected from the internal combustion engine and connected to the load, and the internal asynchronous motor operates as a motor to output power for the hybrid vehicle; regardless of whether the battery of the hybrid vehicle is in a charging state, the outer doubly salient permanent magnet motor always operates as a motor to output power for the hybrid vehicle.

[0018] Compared with the prior art, the present invention has the following technical effects:

[0019] 1. For the dual-stator composite structure motor provided by the present invention, an outer stator permanent magnet and a DC excitation winding are installed on the core yoke of the outer stator core, which improves the power density, torque density, and efficiency of the composite structure motor.

[0020] 2. For the dual-stator composite structure motor provided by the present invention, there are no windings and permanent magnets on the outer salient pole rotor, and the inner squirrel-cage rotor has a strong structure and is suitable for application occasions with high-speed operation.

[0021] 3. For the dual-stator composite structure motor provided by the present invention, the outer stator and the outer salient pole rotor form an outer doubly salient permanent magnet motor. The outer salient pole rotor is directly connected to the load through the outer salient pole rotor bracket, that is, the outer doubly salient permanent magnet motor can only be used as a motor; the inner squirrel-cage rotor and the inner stator form an internal asynchronous motor. The inner squirrel-cage rotor is fixedly connected to the rotating shaft. One output end of the rotating shaft is connected to the internal combustion engine, and the other output end of the rotating shaft is connected to the load. The rotating shaft can be connected to the internal combustion engine or the load according to the situation, that is, the internal asynchronous motor can be used as a generator or a motor. When the battery of the hybrid vehicle needs to be charged, the rotating shaft is disconnected from the load and connected to the internal combustion engine, and the internal asynchronous motor operates as a generator to charge the battery; when the battery of the hybrid vehicle does not need to be charged, the rotating shaft is disconnected from the internal combustion engine and connected to the load, and the internal asynchronous motor no longer operates as a generator but as a motor to jointly output power for the load with the outer doubly salient permanent magnet motor, extending the endurance of the hybrid vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the present invention, the drawings required for description will be briefly introduced below. Obviously, the drawings in the following description are only two embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1 It is a schematic structural diagram of the dual-stator composite structure motor according to the embodiment of the present invention;

[0024] Figure 2 This is a schematic side view of the double-stator composite structure motor according to an embodiment of the present invention.

[0025] In the figure: 1, housing; 2, outer stator; 3, outer stator winding; 4, outer salient pole rotor; 5, inner squirrel-cage rotor; 6, inner stator; 7, third air gap; 8, outer salient pole rotor bracket; 9, second air gap; 10, first air gap; 11, inner stator winding; 12, rotating shaft; 13, inner squirrel-cage rotor bracket; 14, inner squirrel-cage rotor winding; 15, inner stator bracket; 16, first clutch; 17, second clutch; 18, third clutch; 19, outer stator permanent magnet; 20, DC exciting winding. Specific embodiments

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with 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 of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0027] In this article, terms such as "left, right, up, down, front, and back" are established based on the positional relationship shown in the drawings. Depending on the different drawings, the corresponding positional relationship may also change accordingly. Therefore, it cannot be understood as an absolute limitation of the protection scope.

[0028] Please refer to Figures 1 to 2 , this embodiment provides a double-stator composite structure motor, including a housing 1. Inside the housing 1 cavity, an outer stator 2, an outer salient pole rotor 4, an inner squirrel-cage rotor 5, an inner stator 6, and a rotating shaft 12 are sequentially arranged from outside to inside. A first air gap 10 is provided between the inner squirrel-cage rotor 5 and the inner stator 6, a second air gap 9 is provided between the outer salient pole rotor 4 and the inner squirrel-cage rotor 5, and a third air gap 7 is provided between the outer stator 2 and the outer salient pole rotor 4.

[0029] Specifically, both ends of the rotating shaft 12 are rotatably fixed at both ends of the housing 1. One output end of the rotating shaft 12 is connected to an internal combustion engine through a first clutch 16, and the other output end of the rotating shaft 12 is connected to a load through a second clutch 17. The outer stator 2 is fixedly installed inside the housing 1, the inner stator 6 is fixedly installed on an inner stator bracket 15, and the inner stator bracket 15 is fixed at one end of the housing 1. The outer salient pole rotor 4 is rotatably fixed inside the housing 1, and the inner squirrel-cage rotor 5 is fixedly connected to the rotating shaft 12. An outer doubly salient permanent magnet motor is formed between the outer stator 2 and the outer salient pole rotor 4, and an inner asynchronous motor is formed between the inner squirrel-cage rotor 5 and the inner stator 6.

[0030] Specifically, the outer stator 2 includes an outer stator core, outer stator permanent magnets 19, a DC exciting winding 20, and an outer stator winding 3. In this embodiment, the outer stator core is a salient pole core, with salient poles provided on the outer stator core. The protruding direction of the salient poles faces the side of the outer salient pole rotor 4. The number of salient poles is 6, and the outer stator winding 3 is wound around the salient poles. Both the outer stator permanent magnets 19 and the DC exciting winding 20 are installed on the core yoke of the outer stator core, which can improve the power density, torque density, and efficiency of the composite structure motor.

[0031] Specifically, the outer stator permanent magnets 19 are made of neodymium iron boron. The shape of the outer stator permanent magnets 19 is a cuboid. The outer stator permanent magnets 19 are magnetized tangentially, and the magnetization directions of two adjacent outer stator permanent magnets 19 are opposite.

[0032] Specifically, the current directions in adjacent DC exciting windings 20 are opposite.

[0033] Specifically, the outer salient pole rotor 4 includes an outer salient pole rotor core made of a magnetic conductive material. Salient poles are provided on the outer salient pole rotor core. The number of salient poles is 7. The protruding direction of the salient poles faces the side of the outer stator 2. The protruding direction of the salient poles of the outer salient pole rotor core is opposite to that of the salient poles of the outer stator core. The outer salient pole rotor 4 is fixed on the outer salient pole rotor bracket 8. One end of the outer salient pole rotor bracket 8 passing through the machine housing 1 is connected to a load through a third clutch 18.

[0034] Specifically, the inner squirrel-cage rotor 5 includes an inner squirrel-cage rotor core and an inner squirrel-cage rotor winding 14. Radial inner squirrel-cage rotor slots are evenly provided on the inner squirrel-cage rotor core in the circumferential direction. The teeth between adjacent inner squirrel-cage rotor slots are inner squirrel-cage rotor teeth. The inner stator winding 11 is wound around the inner squirrel-cage rotor teeth. The inner squirrel-cage rotor 5 is fixedly installed on the inner squirrel-cage rotor bracket 13, and the inner squirrel-cage rotor bracket 13 is fixedly connected to the rotating shaft 12.

[0035] Specifically, in this double-stator composite structure motor, there are no windings and permanent magnets on the outer salient pole rotor 4. The inner squirrel-cage rotor 5 has a solid structure and is suitable for application scenarios with high-speed operation.

[0036] Specifically, the inner stator 6 includes an inner stator core and an inner stator winding 11. Radial inner stator slots are evenly provided on the inner stator core in the circumferential direction. The teeth between adjacent inner stator slots are inner stator teeth. The inner stator winding 11 is wound around the inner stator teeth.

[0037] Specifically, for the dual-stator composite structure motor provided in this embodiment, the outer salient-pole rotor 4 is connected to the load through the third clutch 18. The outer stator 2 and the outer salient-pole rotor 4 form an outer doubly salient permanent magnet motor, that is, the outer doubly salient permanent magnet motor is only used as a motor. The inner squirrel-cage rotor 5 is fixedly connected to the rotating shaft 12 through the inner squirrel-cage rotor bracket 13. One output end of the rotating shaft 12 is connected to the internal combustion engine through the first clutch 16, and the other output end of the rotating shaft 12 is connected to the load through the second clutch 17. The inner squirrel-cage rotor 5 and the inner stator 6 form an inner asynchronous motor, that is, the inner asynchronous motor can be used as a generator or a motor. If this dual-stator composite structure motor is applied to the field of hybrid vehicles, when the battery of the hybrid vehicle needs to be charged, the rotating shaft 12 is disconnected from the load and connected to the internal combustion engine. The inner asynchronous motor operates as a generator to charge the battery. When the battery of the hybrid vehicle does not need to be charged, the rotating shaft 12 is disconnected from the internal combustion engine and connected to the load. The inner asynchronous motor operates as a motor to output power together with the outer doubly salient permanent magnet motor for the load, extending the endurance of the hybrid vehicle.

[0038] Specifically, this embodiment also provides a working method for the dual-stator composite structure motor. Using the above-mentioned dual-stator composite structure motor as an example in the field of hybrid vehicles, when the battery of the hybrid vehicle needs to be charged, the rotating shaft 12 is disconnected from the load and connected to the internal combustion engine. The internal combustion engine drives the inner asynchronous motor to charge the battery, and the inner asynchronous motor operates as a generator. When the battery of the hybrid vehicle does not need to be charged, the rotating shaft 12 is disconnected from the internal combustion engine and connected to the load. The inner asynchronous motor operates as a motor to output power for the hybrid vehicle. Regardless of whether the battery of the hybrid vehicle is in a charging state, the outer doubly salient permanent magnet motor always operates as a motor to output power for the hybrid vehicle.

[0039] The above embodiments only illustrate the basic principles and characteristics of the present invention, but are not limited by the above embodiments. It should be understood that for those of ordinary skill in the art, various changes and modifications can be made to the present invention without departing from the spirit and scope of the present invention, and these changes and modifications all fall within the scope of the present invention claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A double-stator composite structure motor, characterized in that: The invention comprises a casing (1), wherein an outer stator (2), an outer salient pole rotor (4), an inner squirrel cage rotor (5), an inner stator (6) and a rotating shaft (12) are arranged in sequence from the outside to the inside of the inner cavity of the casing (1), two ends of the rotating shaft (12) are respectively rotatably fixed to two ends of the casing (1), and the inner squirrel cage rotor (5) is fixedly connected to the rotating shaft (12); The outer stator (2) comprises an outer stator core, an outer stator permanent magnet (19), a DC excitation winding (20) and an outer stator winding (3), the outer stator core is provided with a plurality of salient poles, the outer stator winding (3) is wound on the salient poles, and the outer stator permanent magnet (19) and the DC excitation winding (20) are both installed on the core yoke of the outer stator core; the outer salient pole rotor (4) comprises an outer salient pole rotor core made of a magnetic conductive material; the inner squirrel cage rotor (5) comprises an inner squirrel cage rotor core and an inner squirrel cage rotor winding (14), and the inner squirrel cage rotor winding (14) is wound on the inner squirrel cage rotor core; the inner stator (6) comprises an inner stator core and an inner stator winding (11), and the inner stator winding (11) is wound on the inner stator core; The outer stator (2) and the outer salient pole rotor (4) constitute an outer double salient pole permanent magnet motor, and the inner squirrel cage rotor (5) and the inner stator (6) constitute an inner asynchronous motor.

2. The double-stator composite structure motor according to claim 1, characterized in that: The outer salient pole rotor (4) is fixed on an outer salient pole rotor bracket (8), and one end of the outer salient pole rotor bracket (8) passes through the casing (1) and is connected to a load.

3. The double-stator composite structure motor according to claim 2, characterized in that: One output end of the rotating shaft (12) is connected to an internal combustion engine, and the other output end of the rotating shaft (12) is connected to a load.

4. The double-stator composite structure motor according to claim 1, characterized in that: The outer stator core is a salient pole core, the number of salient poles of the outer stator core is 6, and the protruding direction of the salient poles of the outer stator core is toward one side of the outer salient pole rotor (4).

5. The double-stator composite structure motor according to claim 1, characterized in that: The outer salient pole rotor core is provided with a plurality of salient poles, the number of salient poles of the outer salient pole rotor core is 7, and the salient poles of the outer salient pole rotor core protrude in a direction toward the outer stator (2).

6. The double-stator composite structure motor according to claim 1, characterized in that: The outer stator permanent magnet (19) is made of neodymium iron boron and is in the shape of a rectangular parallelepiped.

7. The double-stator composite structure motor according to claim 1, characterized in that: The outer stator permanent magnets (19) are tangentially magnetized, and the magnetization directions of two adjacent outer stator permanent magnets (19) are opposite.

8. The double-stator composite structure motor according to claim 1, characterized in that: A first air gap (10) is provided between the inner squirrel cage rotor (5) and the inner stator (6), a second air gap (9) is provided between the outer salient pole rotor (4) and the inner squirrel cage rotor (5), and a third air gap (7) is provided between the outer stator (2) and the outer salient pole rotor (4).

9. The double-stator composite structure motor according to claim 1, characterized in that: The directions of the currents flowing into adjacent DC excitation windings (20) are opposite.

10. A working method of a dual-stator composite structure motor, characterized in that: The method uses a dual-stator composite structure motor as described in any one of claims 1 to 9. When the battery of the hybrid vehicle needs to be charged, the shaft (12) is disconnected from the load, the shaft (12) is connected to the internal combustion engine, the internal combustion engine drives the internal asynchronous motor to charge the battery, and the internal asynchronous motor operates as a generator; when the battery of the hybrid vehicle does not need to be charged, the shaft (12) is disconnected from the internal combustion engine, the shaft (12) is connected to the load, and the internal asynchronous motor outputs power for the hybrid vehicle as a motor; regardless of whether the battery of the hybrid vehicle is in a charging state, the external double-salient-pole permanent magnet motor is used as a motor to output power for the hybrid vehicle.

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