Direct Drive Wheel Motor Planetary Gear System
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Solution Overview
Problem
Conventional electric land vehicles face inefficiencies in transmitting shaft power and overcoming inertia due to the high torque characteristics of electric motors, leading to increased costs and mechanical complexity, particularly when using conventional central transmissions designed for internal combustion engines.
Innovation Solution
Direct coupling of reversible field electric motors to each driven wheel, combined with planetary gearing for load balancing and efficient power transfer, eliminates the need for a conventional central transmission and reduces drive train friction and inertia, enabling more efficient energy conversion and regenerative braking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional central transmission is used to transmit shaft power from the electric motor, then the vehicle can achieve reliable power delivery, but the mechanical complexity and costs increase significantly
Solution Approach 1:
The patent divides the central transmission system into multiple independent planetary gear units, each associated with a specific wheel. This segmentation eliminates the need for a complex central transmission while maintaining reliable power delivery to each wheel independently through direct motor coupling.
Solution Approach 2:
The patent extracts and eliminates the conventional central transmission component entirely from the drive train. By directly coupling electric motors to each wheel with simplified planetary gearing, the system removes the mechanical complexity of central transmissions while preserving power delivery functionality.
2Force
If high torque electric motors are used to overcome vehicle inertia, then the vehicle achieves better acceleration performance, but the mechanical complexity and costs increase
Solution Approach 1:
The patent segments the high-torque motor function into multiple independent electric motors, each coupled directly to a wheel. This distribution of torque generation across multiple simplified motor units achieves the required force output while reducing overall mechanical complexity compared to a single central transmission system.
Solution Approach 2:
The patent replaces the complex mechanical torque multiplication system of conventional transmissions with directly coupled electric motors that inherently provide high torque at low speeds. This substitution eliminates the need for complex mechanical gear trains while maintaining excellent acceleration performance.
3Loss of energy
If direct coupling of motors to wheels is implemented, then the drive train friction and inertia are reduced, but the manufacturing complexity increases
Solution Approach 1:
The patent segments the propulsion system into modular motor-wheel assemblies with integrated planetary gear units. Each module can be manufactured and tested independently, then assembled into the complete vehicle, thereby reducing drive train friction while maintaining manufacturing ease through modular construction.
Solution Approach 2:
The patent merges the electric motor, planetary gear unit, and wheel assembly into an integrated drive module. This consolidation reduces the number of separate components and connection points, thereby minimizing drive train friction and inertia while simplifying manufacturing through standardized modular units.
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
This approach enhances the efficiency of electric drive vehicles by reducing costs, mechanical complexity, and inefficiencies, allowing for a transition from hydrocarbon to solar power sources while extending the range with an auxiliary DC power source and facilitating easier maintenance.
Implementation Method 1
Reversible field motors have two polarities: motor and generator: respectively powered by electricity in drive or motor polarity, and generating electricity in braking or generator polarity, between the two opposed rotating electromagnetic fields (EMFs) required.
Implementation Method 2
at least one wheel (13) driven by that DCRFM (15) through planetary gearing (18)
Data Source
AI summary
Land vehicle with electric brushless DC motors attached to planetary gear final drives of modular design controlled by an ECU “electronic control unit. Electrical power is supplied by removable modular battery packs on a roll out tray and/or an Enginator an ICE “Internal Combustion Engine” with a Generator in one integrated unit running on combustible fuel. The body of the vehicle having a universal electrical connector that connect the drive-by wire chassis components to control the vehicle.