Motor bridge for battery-powered electric vehicles

Abstract

A motor bridge for a battery-powered electric vehicle is provided. [Solution] The vehicle includes a transmission 1, first to fourth motors 2 to 5, and first to fourth battery boxes 6 to 9. The first and second motors are symmetrically arranged at both ends of one side of the transmission, and the third and fourth motors are symmetrically arranged at both ends of the other side of the transmission, thereby forming a motor bridge with an overall H-shaped symmetrical structure. The first and second battery boxes are symmetrically arranged with respect to the lateral center axis of the transmission, and the third and fourth battery boxes are similarly symmetrically arranged. Furthermore, the first and fourth battery boxes are symmetrically arranged with respect to the longitudinal center axis of the transmission. The motor bridge's perfectly symmetrical arrangement achieves uniform weight distribution and a lower center of gravity throughout the vehicle, improving stability and safety during driving. In addition, four motor boxes can be arranged, enabling the entire system to have a range of over 1,000 km.

Description

[Technical Field]

[0001] This utility model relates to the automotive technology field, in particular to a motor bridge in a battery electric vehicle (BEV). [Background technology]

[0002] An electric vehicle is a vehicle that uses electricity as a power source, drives the wheels with a motor, and complies with various regulations related to road traffic and safety. It is classified as a battery-powered electric vehicle and is attracting attention as an environmentally friendly vehicle that does not have an internal combustion engine. However, at the current stage, the cruising range of battery-powered electric vehicles is not sufficient, which has put a certain constraint on their widespread use. Summary of the Invention

[0003] The present invention provides a motor bridge that addresses the technical issues of short driving range of battery-powered electric vehicles and improving vehicle safety.

[0004] To solve this problem, the present utility model employs the following technical configuration: a motor bridge for a battery-powered electric vehicle, which includes a transmission, a first motor, a second motor, a third motor, and a fourth motor. The first and second motors are symmetrically arranged at both ends of one side of the transmission, and the third and fourth motors are symmetrically arranged at both ends of the other side of the transmission, whereby the transmission, first motor, second motor, third motor, and fourth motor together form a motor bridge with a symmetrical H-shaped structure. The first, second, third and fourth motors all have the same structure. A first battery box and a second battery box are disposed between the first motor and the second motor, and a third battery box and a fourth battery box are disposed between the third motor and the fourth motor. These battery boxes all have the same structure, and the first and second battery boxes are disposed symmetrically with respect to the lateral center axis of the transmission, and the third and fourth battery boxes are similarly disposed symmetrically. In addition, the first battery box and the fourth battery box are disposed symmetrically with respect to the longitudinal center axis of the transmission.

[0005] Furthermore, the first to fourth motors are all permanent magnet synchronous motors with the same structure. Furthermore, the first to fourth motors all have an elongated structure. Furthermore, the first to fourth motors all have a length to diameter ratio of 3:1 or more.

[0006] This utility model has the following advantages over the prior art. The motor bridge of this utility model achieves a perfectly symmetrical arrangement, simultaneously achieving uniform weight distribution throughout the vehicle and a lower center of gravity, improving stability and safety during driving. Its rational design also allows for the placement of four motor boxes, each capable of accommodating a maximum 60kWh lithium-ion battery. Each battery alone can achieve a maximum driving range of 400km, while the entire system can achieve a driving range of over 1000km, technically meeting the range requirements of battery-powered electric vehicles. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a schematic diagram of a motor bridge for a battery-powered electric vehicle according to the present utility model. DETAILED DESCRIPTION OF THE INVENTION

[0008] As a first embodiment, as shown in FIG. 1, the motor bridge for a battery-powered electric vehicle according to the present invention includes a transmission 1, a first motor 2, a second motor 3, a third motor 4, and a fourth motor 5. The first motor 2 and the second motor 3 are symmetrically arranged at both ends on one side of the transmission 1, and the third motor 4 and the fourth motor 5 are symmetrically arranged at both ends on the other side of the transmission 1. As a result, the transmission 1, the first motor 2, the second motor 3, the third motor 4, and the fourth motor 5 as a whole constitute a motor bridge having a symmetrical H-shaped structure. The first motor 2, second motor 3, third motor 4, and fourth motor 5 all have the same structure. A first battery box 6 and a second battery box 7 are disposed between the first motor 2 and the second motor 3, and a third battery box 8 and a fourth battery box 9 are disposed between the third motor 4 and the fourth motor 5. These battery boxes 6 to 9 all have the same structure, and the first and second battery boxes are disposed symmetrically with respect to the lateral central axis of the transmission 1, and the third and fourth battery boxes are similarly disposed symmetrically. Furthermore, the first battery box 6 and the fourth battery box 9 are disposed symmetrically with respect to the longitudinal central axis of the transmission 1.

[0009] To implement the system, the motor bridge is installed on the vehicle chassis, positioned between the four wheels, and the output shaft of the transmission 1 is connected to the wheel drive shaft, allowing the motor to drive the wheels. The perfectly symmetrical layout evens out the weight distribution of the entire vehicle, improving stability and safety during driving. In addition, by arranging four motor boxes, each box can accommodate a maximum 60kWh lithium-ion battery, achieving a maximum driving range of 400km per battery alone, and a total driving range of over 1000km for the entire system.

[0010] The first to fourth motors all use permanent magnet synchronous motors with the same structure. Because they use permanent magnets for excitation, they have a simple structure, which reduces manufacturing and assembly costs, and they are highly reliable because they eliminate factors that could cause failure, such as current collector rings and brushes. In addition, because they do not require excitation current, no excitation loss occurs, improving efficiency and power density, and they are characterized by their compact size, simplicity, and high power density. Furthermore, each motor has a slender structure with a length-to-diameter ratio of 3:1 or more, which allows for efficient use of vehicle space and a lower center of gravity, further improving safety.

[0011] Manufacturing technology for motor bridges for battery-powered electric vehicles: 1. Slender cylindrical motor: A slender cylindrical motor is one in which the ratio of the length of the stator core to its outer diameter is 3 or greater. The motor bridge is mounted on the vehicle as the vehicle's power unit and is installed in place of the chassis frame of an internal combustion engine vehicle. Therefore, by making the motor a slender structure, the weight of the chassis frame can be replaced by the motor shell, and the center of gravity of the vehicle can be lowered near the chassis frame. 2. Phase synchronization with four motors: By providing physical reference points on the stator and rotor of each motor and on the transmission shaft that functions as a link, and assembling them in a coordinated manner, the rotation of the four motors is structurally synchronized. This enables precise synchronization control by the control unit and the realization of an automated control mode. 3. Connect multiple motor bridges in series to create a high-power unit: By connecting multiple motor bridges in series based on physical reference points using spline joints, a high-output power unit can be formed, which can be applied to the electric drive of large buses, medium-sized buses, trucks, etc. 4. Wiring method for slender cylindrical motor stator: Conventional multi-core winding wiring methods are unsuitable for slender motors, and are difficult to install, inefficient, and difficult to ensure quality. Therefore, this utility model uses a single-core conductor and winds the stator using a double-layer or wave-like winding method, achieving high efficiency and stable wiring quality.

[0012] Although the present utility model and its embodiments have been described above, this description is not limiting, and the drawings are merely one embodiment of the present utility model, and actual applications are not limited thereto. In other words, any structural aspects and examples similar to the technical means designed by a person skilled in the art based on the suggestions therein and without departing from the spirit and scope of the creation of the present utility model shall all fall within the scope of protection of the present utility model. [Explanation of symbols]

[0013] 1. Transmission 2. First motor 3 Second motor 4. Third motor 5. 4th motor 6 First battery box 7 Second battery box 8 Third battery box 9 4th battery box

Claims

1. A motor bridge for a battery-powered electric vehicle, comprising a transmission (1), a first motor (2), a second motor (3), a third motor (4), and a fourth motor (5), The first motor (2) and the second motor (3) are symmetrically arranged at both ends on one side of the transmission (1), and the third motor (4) and the fourth motor (5) are symmetrically arranged at both ends on the other side of the transmission (1), so that the transmission 1 and the motors (2 to 5) as a whole form a motor bridge having a symmetrical H-shaped structure; The first motor (2), second motor (3), third motor (4), and fourth motor (5) all have the same structure, A motor bridge for a battery-powered electric vehicle, characterized in that a first battery box (6) and a second battery box (7) are arranged between the first motor (2) and the second motor (3), a third battery box (8) and a fourth battery box (9) are arranged between the third motor (4) and the fourth motor (5), these battery boxes (6-9) all have the same structure, the first battery box (6) and the second battery box (7) are arranged symmetrically with respect to the lateral central axis of the transmission (1), the third battery box (8) and the fourth battery box (9) are similarly arranged symmetrically, and the first battery box (6) and the fourth battery box (9) are arranged symmetrically with respect to the longitudinal central axis of the transmission (1).

2. 2. The motor bridge for a battery-powered electric vehicle according to claim 1, wherein the first motor (2), second motor (3), third motor (4), and fourth motor (5) are all permanent magnet synchronous motors of the same structure.

3. 3. The motor bridge for a battery-powered electric vehicle according to claim 2, wherein the first motor (2), the second motor (3), the third motor (4), and the fourth motor (5) all have an elongated structure.

4. 4. The motor bridge for a battery-powered electric vehicle according to claim 3, wherein the first motor (2), second motor (3), third motor (4), and fourth motor (5) all have a length-to-diameter ratio of 3:1 or more.

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