EV Wheel Radius and Motor Control for Lower Axial Friction
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Solution Overview
Problem
Current automotive designs do not adequately address fuel efficiency, particularly in wheel design, leading to significant energy losses due to axial friction, which limits the distance an electric car can travel for a given battery charge.
Innovation Solution
The use of larger diameter wheels, with a radius at least 20% greater than standard wheels, combined with advanced motor control systems and electronic steering, to optimize torque distribution and reduce friction energy loss, allowing for greater travel distance on a single charge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If standard sized wheels are used, then the vehicle structure is compact and easier to manufacture, but axial friction increases and reduces travel distance
Solution Approach 1:
The patent changes the critical parameter of wheel radius from standard size to at least 20% larger than standard. This parameter change directly reduces axial friction and increases the distance traveled per unit of energy, resolving the contradiction between energy efficiency and energy loss.
2Duration of action of moving object
If larger diameter wheels are used, then axial friction is reduced and travel distance is increased, but vehicle complexity and manufacturing difficulty increase
Solution Approach 1:
The patent applies local quality by making only the wheels larger while keeping other vehicle components standard size. This localized change achieves the benefit of reduced axial friction and increased travel distance without requiring a complete redesign of the entire vehicle system, thereby limiting the increase in complexity.
3Loss of energy
If larger diameter wheels are used, then friction energy loss is reduced, but vehicle weight and manufacturing cost increase
Solution Approach 1:
The patent changes the wheel radius parameter to be at least 20% larger than standard, which reduces friction energy loss. The specification acknowledges this increases weight but accepts it as a necessary trade-off to achieve the primary goal of improved energy efficiency and extended travel distance.
Data Source
AI summary
An electrical passenger car, the electrical passenger car including: at least two electrically driven motors; a battery pack; motor control electronics; a communication control unit; where the motor control electronics are connected to the at least two electrically driven motors; wheels, where the wheels are connected to the at least two electrically driven motors; and sensors, where the sensors are connected to at least the motor control electronics, where the wheels include a first wheel and a second wheel, where the second wheel has a radius at least 7% greater than a radius of the first wheel, where the communication control unit is designed to communicate the motor control electronics with a cloud AI server, and where the electrical passenger car is designed to be driven on a paved road.