Symmetrical EV Motor Bridge Layout for Range and Mass Balance
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Solution Overview
Problem
The unsatisfactory endurance mileage of electric vehicles limits their full promotion, and there is a need to improve vehicle safety.
Innovation Solution
An electric vehicle motor bridge with a symmetrical H-shaped layout comprising four permanent magnet synchronous motors, each with a slender structure and a ratio of length to diameter of at least 3:1, evenly distributing vehicle mass and incorporating battery boxes to accommodate up to 60 kWh lithium batteries, forming a bridge structure between the wheels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If a single motor and battery configuration is used, then the structure is simple, but the endurance mileage is insufficient
Solution Approach 1:
The motor bridge is divided into four independent motor units (first, second, third, and fourth motors) symmetrically arranged around the gearbox. Each motor can be independently controlled and optimized, allowing the system to achieve extended endurance mileage through coordinated operation of multiple motors while maintaining manageable structural complexity through modular design
2Reliability
If mass is concentrated in one area, then the structure is compact, but vehicle safety deteriorates
Solution Approach 1:
The patent employs a symmetric arrangement of four motors and battery boxes around the central gearbox, creating a balanced H-shaped structure. This symmetry ensures even mass distribution across the vehicle chassis, lowering the center of gravity and improving vehicle stability and safety, while the modular symmetric design keeps the overall structure compact and manageable
3Duration of action of moving object
If battery capacity is increased to extend range, then endurance mileage improves, but vehicle weight increases
Solution Approach 1:
The battery system is segmented into four separate battery boxes (first, second, third, and fourth battery boxes) distributed symmetrically around the gearbox. Each battery box can accommodate up to 60 kWh lithium batteries. This segmentation allows the total battery capacity to reach over 1,000 kilometers of endurance while distributing the weight across multiple locations, preventing excessive concentration of mass and maintaining vehicle balance
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The symmetrical layout enhances vehicle safety by evenly distributing mass, increases endurance mileage to over 1,000 kilometers, and improves motor efficiency and reliability by using permanent magnet synchronous motors.
Implementation Method 1
the first motor, the second motor, the third motor, and the fourth motor adopt permanent magnet synchronous motors with the same structure
Data Source
AI summary
An electric vehicle motor bridge, comprising a gearbox, a first motor, a second motor, a third motor, and a fourth motor; the first motor and the second motor are symmetrically arranged at two ends of one side of the gearbox, and the third motor and the fourth motor are symmetrically arranged at two ends of the other side of the gearbox; therefore, the gearbox, the first motor, the second motor, the third motor, and the fourth motor form an H-shaped symmetrically distributed bridge structure as a whole. The motor bridge of the invention adopts a completely symmetrical layout structure, so that the mass of the whole vehicle is evenly distributed and the center of gravity of the whole vehicle is reduced as much as possible, thereby greatly improving the safety of vehicle driving. It can be arranged with 4 motor boxes, so that the total endurance mileage exceeds 1,000 kilometers.