Dual-Motor Differential Drive System for Electric Vehicles
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Solution Overview
Problem
Existing dual-motor drive systems for electric vehicles face high manufacturing costs and power consumption due to the need for gearboxes and high-power components, and single-motor systems suffer from overheating and inefficiency.
Innovation Solution
A dual-motor differential drive system that connects dual motors through a differential unit, allowing them to operate at different rotational speeds and powers without interference, replacing the gearbox to reduce costs and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a gearbox is used to adjust motor rotational speed, then motor working efficiency is improved, but manufacturing cost and device complexity increase
Solution Approach 1:
The patent removes the gearbox from the drive system entirely, using a direct-drive configuration where the motor shaft connects directly to the wheel hub. This extraction of the problematic component eliminates the associated complexity and cost while maintaining motor efficiency through electronic control of motor speed and torque.
Solution Approach 2:
The patent replaces the mechanical gearbox with an electronic control system that regulates motor output. The motor controller adjusts electrical parameters to achieve the desired speed-torque characteristics without mechanical transmission components, substituting electronic control for mechanical gear adjustment.
2Power
If high-power components are used to meet power demand, then power output is improved, but manufacturing cost increases
Solution Approach 1:
The patent divides the power delivery function across multiple motor units (e.g., multiple hub motors distributed across wheels). Instead of using a single high-power component, the system segments the total power requirement into several lower-power motors that work in parallel, reducing the cost and complexity of individual components while achieving the same total power output.
3Temperature
If a water cooling device is used for single-motor drive system, then heat dissipation is improved, but power consumption and cost increase
Solution Approach 1:
The patent distributes the heat generation across multiple smaller motor units, each producing less heat than a single large motor. This segmentation of thermal load reduces the cooling requirements for each individual motor, allowing for simpler, less power-intensive cooling solutions or passive heat dissipation designs.
4Temperature
If dual motors with similar output performance are used, then heat generation is reduced, but power ratio adjustment complexity increases
Solution Approach 1:
The patent implements dynamic power distribution between dual motors through electronic control, allowing the power ratio to be adjusted in real-time based on driving conditions. The motor controller dynamically allocates torque and power between the two motors without requiring mechanical adjustment mechanisms, maintaining simplicity while optimizing performance and heat distribution.
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 system reduces manufacturing costs and power consumption while preventing overheating, achieving a total output power close to the sum of individual motor powers without the need for gear adjustments.
Implementation Method 1
The first motor has a first shaft and is connected to the differential unit. The second motor has a second shaft and is connected to the differential unit. The first motor and the second motor are adapted to run in reverse direction or run in same direction to respectively drive the differential unit to rotate.
Data Source
AI summary
A dual-motor differential drive system, including a main wheel, a drive wheel, a differential unit, a first motor, a second motor, and at least one drive unit, is provided. The main wheel has a central shaft. The drive wheel is disposed on the main wheel. The differential unit is disposed on a side of the drive wheel and aligned with the drive wheel. The first motor and the second motor respectively have a first shaft and a second shaft, and are connected to the differential unit. The at least one drive unit is disposed on the differential unit and the drive wheel. The first motor and the second motor are adapted to run in same or reverse direction to respectively drive the differential unit to rotate. The differential unit drives the drive wheel through the at least one drive unit, enabling the main wheel to pivot through the central shaft.