Dual-motor integrated structure

Abstract

The utility model relates to a dual-motor integrated structure which sequentially comprises a cylindrical component, a first cylindrical component and a second cylindrical component from inside to outside in the radial direction, the cylindrical component is wrapped with the first cylindrical component in the circumferential direction, and the first cylindrical component is wrapped with the second cylindrical component in the circumferential direction. At least one of the cylindrical member, the first cylindrical member, and the second cylindrical member serves as a stator, at least another serves as a rotor, and in a case where only one of the cylindrical member, the first cylindrical member, and the second cylindrical member serves as a rotor, the remaining two members serving as stators are not adjacent. According to the dual-motor integrated structure, a stator or a rotor and corresponding configuration thereof are omitted, so that required materials and even manufacturing cost are saved.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a dual-motor integrated structure. Background Art

[0002] In traditional electric vehicles, electric motors typically consist of a single stator and rotor. However, as the field evolves, manufacturers are developing and continuing to develop motors with dual rotors and stators. A common approach is to simply integrate a motor with a permanent magnet rotor or a motor with an induction rotor. This means using two motors and corresponding controllers within the vehicle, increasing the cost of the electric drive system.

[0003] Chinese invention patent application CN102570745A discloses an oil-magnetic levitation dual-stator high-efficiency motor, the radial arrangement of which is arranged in the order of NS pole - cylinder - NS / SN pole, wherein an isolation layer is provided in the middle of the cylinder. Such an arrangement isolates the magnetic field between the inner and outer surfaces of the rotor, reducing the magnetic field utilization rate, thereby increasing the manufacturing cost. In addition, Chinese utility model patent CN211579836U discloses a brushless dual-rotor composite motor structure, the stator of which has a stator magnetic isolation, which similarly leads to the isolation of the magnetic field between the inner and outer surfaces of the stator. In fact, these dual-stator / dual-rotor motors in the prior art are not simple single stator-two rotors / single rotor-two stators structures, but two stators-two rotors integrated into one structure. Such a structure places greater demands on the quantity of materials, thereby increasing the manufacturing cost of the manufacturer. Utility Model Content

[0004] In order to overcome at least one of the defects described in the above-mentioned prior art, the present application proposes a dual-motor integrated structure, which includes, radially from the inside to the outside, a cylindrical member, a first cylindrical member circumferentially covering the cylindrical member, and a second cylindrical member circumferentially covering the first cylindrical member. At least one of the cylindrical member, the first cylindrical member and the second cylindrical member acts as a stator, and at least the other acts as a rotor. In the case that only one of the cylindrical member, the first cylindrical member and the second cylindrical member acts as a rotor, the remaining two members acting as stators are not adjacent.

[0005] According to one embodiment, the cylindrical member and the first cylindrical member serve as a rotor, and the second cylindrical member serves as a stator.

[0006] According to another embodiment, the cylindrical member and the second cylindrical member serve as a rotor, and the first cylindrical member serves as a stator.

[0007] According to yet another embodiment, the cylindrical member and the second cylindrical member serve as a stator, and the first cylindrical member serves as a rotor.

[0008] According to some embodiments, the stator includes stator teeth and a stator winding, and the stator winding is configured as a distributed winding or a concentrated winding.

[0009] According to some embodiments, the rotor is configured as a permanent magnet rotor or an induction rotor.

[0010] According to yet another embodiment, in the case where only one of the cylindrical member, the first cylindrical member, and the second cylindrical member functions as a stator, at least one of the remaining two members functioning as rotors is a permanent magnet rotor.

[0011] According to another embodiment, the first cylindrical component includes a stator core and a stator winding, and the stator core is provided with a plurality of through slots penetrating the stator core in a radial direction, so that the magnetic field induced by the stator winding passes through the plurality of through slots.

[0012] According to yet another embodiment, the plurality of through slots are provided at fixed intervals in the circumferential direction of the stator core.

[0013] According to yet another embodiment, the main body of the first cylindrical member is constituted only by permanent magnets or only by coil windings, and does not include any component separating the inner surface and the outer surface of the first cylindrical member.

[0014] The dual-motor integrated structure of the present application omits a stator or a rotor and its corresponding configuration (for example, a magnetic barrier), thereby saving the required materials and even manufacturing costs. Accordingly, since the dual stators / dual rotors are integrated into a single motor assembly, a motor controller is further omitted. In other words, the present application configures the six phases of the dual stators / dual rotors to be controlled by a single motor controller, further saving the required materials and even manufacturing costs. Furthermore, whether it is a structure in which the dual rotors sandwich the stator or the dual stators sandwich the rotor, the first cylindrical member located in the middle always encourages the magnetic field to pass through it radially, thereby improving the utilization rate of the magnetic field and even the final motor efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 shows a radial cross-sectional view of a dual-motor integrated structure according to a first embodiment of the present application;

[0016] Figure 2 shows a radial cross-sectional view of a dual-motor integrated structure according to a second embodiment of the present application; and

[0017] Figure 3A radial cross-sectional view of a dual-motor integrated structure according to a third embodiment of the present application is shown. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0019] It should be noted that the illustrations provided in this embodiment only illustrate the basic concept of the present application in a schematic manner. Therefore, the illustrations only show components related to the present application and are not drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component can be changed at will, and the component layout type may also be more complicated.

[0020] The structures, proportions, sizes, etc. depicted in the drawings of this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology. They are not intended to limit the conditions under which this application can be implemented, and therefore have no substantive technical significance. Any structural modifications, changes in proportional relationships, or adjustments in size, without affecting the efficacy and objectives that can be achieved by this application, should still fall within the scope of the technical contents disclosed in this application.

[0021] The directions or positional relationships indicated in this specification, such as "upper," "lower," "left," "right," "center," "longitudinal," "transverse," "horizontal," "inner," "outer," "radial," and "circumferential," are based on the directions or positional relationships shown in the accompanying drawings and are intended solely for the purpose of simplifying the description. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In order to solve the technical problems mentioned above, the present application proposes a dual-motor integrated structure, which includes a cylindrical member, a first cylindrical member circumferentially covering the cylindrical member, and a second cylindrical member circumferentially covering the first cylindrical member in sequence from the inside to the outside in the radial direction. Any of these three members can act as a stator or a rotor. Moreover, it is inevitable for the motor that it must be equipped with at least one stator and at least one rotor, which means that the ratio of the three members acting as stators / rotors (stator: rotor) can be 2:1 or 1:2. However, it should be noted that when the stator / rotor ratio adopted is 2:1, the two members acting as stators cannot be adjacent to each other, that is, the first cylindrical member and the second cylindrical member cannot act as stators at the same time, or the cylindrical member and the first cylindrical member cannot act as stators at the same time. Only the cylindrical member and the second cylindrical member can act as stators at the same time.

[0023] Compared to existing designs that integrate two stators and two rotors, the dual-motor integrated structure of this application omits one stator or one rotor and its corresponding configuration (e.g., magnetic barriers), thereby saving required materials and even manufacturing costs. Accordingly, by integrating the dual stators / dual rotors into a single motor assembly, a motor controller is further omitted. In other words, this application configures all six phases of the dual stators / dual rotors to be controlled by a single motor controller, further saving required materials and even manufacturing costs.

[0024] Any component acting as a stator may include stator teeth and stator windings, wherein the stator windings can be configured as distributed windings or concentrated windings. Concentrated windings mean that the coil windings are always precisely wound around one stator tooth, which has significant advantages in stator manufacturing. For example, a completed winding can be simply pushed onto the stator. Distributed windings, on the other hand, mean that the coil windings are wound around at least two stator teeth, but can also be wound around three, four, five, or more stator teeth. A very important advantage of distributed windings is that the generated back electromotive force has a smooth, substantially sinusoidal characteristic.

[0025] On the other hand, any component acting as a rotor can be configured as a permanent magnet rotor or an induction rotor. As the name suggests, a permanent magnet rotor directly uses permanent magnets as the main material of the rotor, which gives the rotor a magnetic field. Induction rotors, on the other hand, can be made of cast aluminum or cast copper, or they can be wound with wire. The windings wound with wire cut through the magnetic lines of flux, generating an induced electromotive force, which in turn generates an induced current in the rotor. The induced current in the winding then interacts with the magnetic field to generate electromagnetic torque, causing the rotor to rotate. Since the induced current gradually decreases as the rotor speed approaches the synchronous speed, the generated electromagnetic torque also decreases accordingly. Therefore, when the induction asynchronous motor is in a stable operating state, the rotor speed is less than the synchronous speed.

[0026] Example 1

[0027] like Figure 1 As shown, along the radial direction of the dual-motor integrated structure, from the inside to the outside, it includes: a cylindrical component 1a acting as a rotor, especially an induction rotor; a first cylindrical component 2a acting as a rotor, especially a permanent magnet rotor; a second cylindrical component 3a acting as a stator, wherein the stator winding can be a distributed winding or a centralized winding.

[0028] The dual-motor integrated structure in this embodiment can be used as both a vehicle-wide range-extended power generation mode and an induction motor-assisted drive system. The fuel engine drives the first cylindrical member 2a, which serves as the permanent magnet rotor, while the cylindrical member 1a, which serves as the induction rotor, serves as the auxiliary drive rotor. During operation, the motor controller controls the first cylindrical member 2a, which serves as the permanent magnet rotor, to rotate with the fuel engine, generating a changing magnetic field. This changing magnetic field then independently drives the cylindrical member 1a, which serves as the auxiliary drive rotor. The motor controller also controls the second cylindrical member 3a, which serves as the stator, to generate an induced electromotive force while cutting the magnetic flux lines (of the rotating first cylindrical member 2a). This generates an induced current in the second cylindrical member 3a, which is then fed back to the vehicle's power supply system. This simultaneously drives the cylindrical member 1a, which serves as the auxiliary drive rotor, according to the operating principle of an induction asynchronous motor. In other words, during this period, the cylindrical member 1a is driven while the second cylindrical member 3a is generating electricity.

[0029] Additionally or alternatively, the dual-motor integrated structure in this embodiment utilizes dual rotors for driving, specifically, the magnetic field of the second cylindrical member 3a (serving as a stator) is coupled with the magnetic field of the first cylindrical member 2a (serving as a permanent magnet rotor), and then the magnetic field of the first cylindrical member 2a is coupled with the magnetic field of the cylindrical member 1a (serving as an auxiliary drive rotor), thereby achieving the magnetic field of the second cylindrical member 3a driving the first cylindrical member 2a and the cylindrical member 1a at the same time.

[0030] Of course, regarding the two components acting as rotors, it is also feasible for them to adopt a configuration opposite to the above, which will not be described in detail here.

[0031] Example 2

[0032] like Figure 2 As shown, the dual-motor integrated structure includes, radially from the inside out, a cylindrical member 1b serving as the stator; a first cylindrical member 2b serving as the rotor, which can be a permanent magnet rotor or an induction rotor; and a second cylindrical member 3b serving as the stator. The stator windings of the two stator members can be distributed or centralized.

[0033] In particular, the first cylindrical member 2b, acting as the rotor, can be composed of several permanent magnets connected circumferentially, or simply coil windings. In other words, there is no cylindrical structure between the inner and outer surfaces of the first cylindrical member 2b to isolate the magnetic field. This allows the magnetic field / magnetic flux lines to pass radially through the permanent magnets or coil windings, resulting in increased utilization of the magnetic fields generated by the two stator members.

[0034] The dual-motor integrated structure in this embodiment can function as a dual-generator system. The fuel engine drives the first cylindrical member 2b, which functions as a permanent magnet rotor. The rotating first cylindrical member 2b generates a changing magnetic field, and the cylindrical member 1b and the second cylindrical member 3b cut through the magnetic flux lines, generating an induced current. The motor controller can then manipulate the cylindrical member 1b and the second cylindrical member 3b to charge the vehicle's power supply system together, or to manipulate either cylindrical member 1b or the second cylindrical member 3b independently.

[0035] Additionally or alternatively, the dual-motor integrated structure in this embodiment can be used as a dual-stator motor, wherein the motor controller can coordinate the cylindrical member 1b and the second cylindrical member 3b to generate a synchronous alternating magnetic field, thereby driving the first cylindrical member 2b (as a rotor) to rotate.

[0036] Example 3

[0037] like Figure 3 As shown, the dual-motor integrated structure includes, radially from the inside out, a cylindrical component 1c serving as the rotor; a first cylindrical component 2c serving as the stator, where the stator winding can be either distributed or centralized; and a second cylindrical component 3c serving as the rotor. It should be noted that both rotor components can be permanent magnet rotors, either the radially inner cylindrical component 1c or the outermost second cylindrical component 3c. Alternatively, one rotor can be a permanent magnet rotor and the other an induction rotor.

[0038] Furthermore, the first cylindrical member 2c of the stator comprises a stator core and stator windings. The stator core is provided with a plurality of radially extending slots, allowing the magnetic field induced by the stator windings to pass through the slots. This improves magnetic field utilization and ultimately motor efficiency. Preferably, these slots are spaced a fixed distance apart circumferentially around the stator core, ensuring that the magnetic field / magnetic flux lines passing through the stator core are as uniform as possible along the circumference of the stator core.

[0039] The dual-motor integrated structure in this embodiment can be used as a dual drive motor. The motor controller manipulates the alternating current / magnetic field of the first cylindrical component 2c located in the middle, thereby driving the cylindrical component 1c and the second cylindrical component 3c serving as the rotor to rotate synchronously under the alternating magnetic field.

[0040] Additionally or alternatively, the dual-motor integrated structure in this embodiment can also be used as a vehicle-wide range-extended power generation mode and an induction motor auxiliary drive all-in-one, wherein the fuel engine drives the cylindrical member 1c or the second cylindrical member 3c as a permanent magnet rotor, and the first cylindrical member 2c as a stator cuts the magnetic flux lines to generate an induced electromotive force, charging the vehicle's power supply system. On the other hand, the other of the cylindrical member 1c and the second cylindrical member 3c, whether serving as a permanent magnet rotor or an induction rotor, is driven by the alternating magnetic field (of the rotating cylindrical member 1c or the second cylindrical member 3c), rotating asynchronously according to the operating principle of an induction asynchronous motor.

[0041] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0042] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A dual-motor integrated structure, comprising, radially from the inside to the outside, a cylindrical member, a first cylindrical member circumferentially covering the cylindrical member, and a second cylindrical member circumferentially covering the first cylindrical member, characterized in that: At least one of the cylindrical member, the first cylindrical member, and the second cylindrical member functions as a stator, and at least another functions as a rotor, and when only one of the cylindrical member, the first cylindrical member, and the second cylindrical member functions as a rotor, the remaining two members functioning as stators are not adjacent.

2. The dual-motor integrated structure according to claim 1, characterized in that: The columnar member and the first cylindrical member function as a rotor, and the second cylindrical member functions as a stator.

3. The dual-motor integrated structure according to claim 1, characterized in that: The columnar member and the second cylindrical member function as a rotor, and the first cylindrical member functions as a stator.

4. The dual-motor integrated structure according to claim 1, characterized in that: The columnar member and the second cylindrical member function as a stator, and the first cylindrical member functions as a rotor.

5. The dual-motor integrated structure according to any one of claims 2 to 4, characterized in that: The stator includes stator teeth and a stator winding, and the stator winding is configured as a distributed winding or a concentrated winding.

6. The dual-motor integrated structure according to any one of claims 2 to 4, characterized in that: The rotor is configured as a permanent magnet rotor or an induction rotor.

7. The dual-motor integrated structure according to claim 6, characterized in that: In a case where only one of the cylindrical member, the first cylindrical member, and the second cylindrical member functions as a stator, at least one of the remaining two members functioning as rotors is a permanent magnet rotor.

8. The dual-motor integrated structure according to claim 3, characterized in that: The first cylindrical component includes a stator core and a stator winding. The stator core is provided with a plurality of through slots penetrating the stator core in a radial direction so that the magnetic field induced by the stator winding passes through the plurality of through slots.

9. The dual-motor integrated structure according to claim 8, characterized in that: The plurality of through slots are opened in a circumferential direction of the stator core at a fixed interval from each other.

10. The dual-motor integrated structure according to claim 4, characterized in that: The main body of the first cylindrical member is composed only of permanent magnets or only of coil windings, and does not include any component separating the inner surface and the outer surface of the first cylindrical member.

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