Vehicle Electric Machine Rotor With Radial Fluid Braking
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Solution Overview
Problem
Existing electric machines for vehicles, particularly heavy-duty trucks, require improved braking efficiency, as current solutions are either inefficient or occupy excessive space and resources.
Innovation Solution
An electric machine with a fluid-based brake arrangement featuring a radial fluid channel segment within the rotor, allowing brake fluid to accelerate and generate a braking torque, thus providing a simple and reliable braking mechanism with reduced space requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a fluid-based brake arrangement with radial fluid channel segments is integrated into the rotor, then braking efficiency is improved and space occupation is reduced, but the device complexity increases due to the fluid circuit system
Solution Approach 1:
The brake arrangement is merged with the rotor by integrating radial fluid channel segments directly into the rotor structure. This combination eliminates the need for separate brake components, reduces overall space occupation, and maintains improved braking efficiency while minimizing the increase in device complexity.
Solution Approach 2:
The rotor serves multiple functions: it acts as both the rotating component of the electric machine and as the housing for the brake arrangement. The radial fluid channel segments enable the rotor to function as both a magnetic component and a braking component, reducing the need for additional separate systems.
2Force
If brake fluid is accelerated through radial fluid channel segments during rotor rotation, then braking torque is generated, but the system requires additional fluid circuit components
Solution Approach 1:
The rotor itself provides the braking function by utilizing its own rotation to accelerate brake fluid through the radial channel segments. The rotating rotor structure serves its own braking needs without requiring an entirely separate braking system, thereby generating braking torque while minimizing additional complexity.
Solution Approach 2:
The brake arrangement utilizes hydraulic principles by accelerating brake fluid through radial channel segments during rotor rotation. The kinetic energy of the rotating rotor transfers to the brake fluid, creating a reactive braking torque through fluid dynamics rather than traditional mechanical friction.
3Volume of moving object
If the brake arrangement occupies less space within the rotor, then compact design is achieved, but the braking power may be reduced
Solution Approach 1:
The radial fluid channel segments are strategically positioned within the rotor structure to optimize braking performance in a compact space. The channel segments are located where they can effectively utilize the rotor's rotational velocity to accelerate brake fluid, maximizing braking power density within the available volume.
Solution Approach 2:
The braking function is achieved by utilizing the radial dimension within the rotor structure. Instead of expanding the braking system axially or tangentially, the radial fluid channel segments exploit the radial space already present in the rotor, achieving compact design while maintaining braking power through three-dimensional spatial optimization.
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 fluid-based brake arrangement enhances braking efficiency, reduces space occupation, and allows for higher recuperation power compared to traditional systems, while maintaining a compact design with fewer moving parts.
Implementation Method 1
acceleration of brake fluid in the at least one radial fluid channel segment causes a reaction force exerting a braking torque on the rotor
Data Source
AI summary
An electric machine comprising a rotor, a stator, and a fluid-based brake arrangement for said rotor, said fluid-based brake arrangement having a fluid circuit for transporting a brake fluid, said fluid circuit comprising a fluid channel arrangement having at least one radial fluid channel segment extending radially through a part of said rotor so as to allow for directing brake fluid from an inner radial rotor side to an outer radial rotor side, whereby, during rotation of said rotor about an axial centre axis, acceleration of brake fluid in said at least one radial fluid channel segment causes a reaction force exerting a braking torque on the rotor.