Dual-Motor EV Drive System Segmentation for Power and Efficiency
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Solution Overview
Problem
Current electric vehicle powertrains, particularly hybrid and all-electric vehicles, face challenges in achieving improved power output and efficiency while maintaining performance, range, reliability, safety, and cost-effectiveness, with existing multi-motor configurations being complex and inefficient.
Innovation Solution
A dual-motor drive assembly comprising a permanent magnet synchronous motor and an induction asynchronous motor, each mechanically coupled to a vehicle axle with dedicated controllers and a vehicle controller that optimally splits power between the two motors based on torque requests, motor characteristics, and real-time updates from sensors, utilizing a single battery pack and inverters for efficient energy distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single electric motor is used in an all-electric vehicle, then the drive train complexity is reduced, but the power output and efficiency are limited
Solution Approach 1:
The powertrain is segmented into two independent motor systems: a permanent magnet synchronous motor system and an induction motor system. Each motor can operate independently or in combination, allowing the system to achieve high power output when needed while maintaining simplicity by using only one motor at a time during normal operation.
Solution Approach 2:
The system dynamically switches between single-motor and dual-motor operation modes based on power demands. The vehicle controller optimally splits power between the two motors in real-time, enabling the system to adapt its complexity level to match the required power output.
2Power
If multiple electric motors are used to improve power output and efficiency, then the power and efficiency are enhanced, but the drive train complexity increases
Solution Approach 1:
The dual-motor system is segmented into two distinct motor types with different operational characteristics, allowing them to be controlled independently. This segmentation enables the system to use only the necessary motor(s) for current operating conditions, reducing effective complexity while maintaining high power capability.
Solution Approach 2:
The vehicle controller changes operational parameters by dynamically adjusting the power split between motors based on real-time conditions. This allows optimal efficiency and power output without requiring complex mechanical linkages or transmissions.
3Use of energy by moving object
If hybrid drive train with internal combustion engine and electric motor is used, then the gas mileage is improved, but the harmful pollution emissions are still present
Solution Approach 1:
The internal combustion engine is completely extracted from the powertrain, replaced by a dual-motor electric drive system. This elimination removes the source of harmful emissions while maintaining improved energy efficiency through optimal motor operation and regenerative braking capability.
4Use of energy by moving object
If hybrid drive train with internal combustion engine and electric motor is used, then the gas mileage is improved, but the drive train complexity and cost increase
Solution Approach 1:
The internal combustion engine and its associated complex mechanical systems are extracted and replaced with an all-electric dual-motor powertrain. This simplification eliminates the need for complex engine-motor integration while maintaining energy efficiency benefits.
Solution Approach 2:
The mechanical complexity of the hybrid system is replaced with electrical control systems. The vehicle controller manages power distribution between motors electronically, eliminating the need for complex mechanical couplings, transmissions, and engine control mechanisms.
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 dual-motor configuration optimizes power output and efficiency, providing improved operational performance, extended driving range, and reduced complexity and weight, with the permanent magnet motor excelling in low-speed applications and the induction motor in high-speed, high-torque scenarios, resulting in a flatter power curve and enhanced overall efficiency.
Implementation Method 1
at least one permanent magnet synchronous motor mechanically coupled to, and configured to provide propulsive power to, at least one wheel of a first vehicle axle
Implementation Method 2
at least one induction asynchronous motor mechanically coupled to, and configured to provide propulsive power to, at least one wheel of a second vehicle axle
Data Source
AI summary
A dual-motor electric vehicle (EV) drive system is provided that employs two different types of electric motors; at least one permanent magnet synchronous motor and at least one induction asynchronous motor. Under most low demand driving applications the EV relies on the permanent magnet motor(s), thus benefiting from the operating efficiency of this type of motor. Under high demand driving applications, for example during strong acceleration and high speed cruising, the EV is able to benefit from the output power capabilities of the induction motor(s).