Dual Shaft Motor Torque Vectoring and Cooling
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Solution Overview
Problem
Existing motor vehicle drive units for electric vehicles face challenges in efficiently distributing torque between driven wheels, requiring differential transmissions and multi-speed reductions, which increase weight and cost, and are limited by motor rotor mechanical speed limits, affecting performance and usability.
Innovation Solution
A motor vehicle drive unit with an electric motor featuring a rotor and a counter-rotating main stator, an auxiliary stator for torque vectoring, and cooling fins within an air duct cover with an auxiliary fan, along with chain drive and gear drive reductions, enabling improved torque distribution and cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a differential transmission and multi-speed reduction gear are used to distribute torque between driven wheels, then torque distribution capability is improved, but vehicle weight and device complexity increase
Solution Approach 1:
The patent combines the functions of differential transmission and multi-speed reduction gear into a single integrated transmission system. The planetary gear mechanism serves both as a differential for torque distribution and as a reduction gear, eliminating the need for separate components and thereby reducing overall vehicle weight while maintaining torque distribution capability.
Solution Approach 2:
The planetary gear mechanism is designed to perform multiple functions simultaneously: it acts as a differential transmission for torque distribution between wheels, provides multi-speed reduction gearing, and enables torque vectoring. This multi-functionality reduces the number of separate components needed, thereby reducing vehicle weight and complexity.
2Productivity
If a multi-speed transmission is used to overcome motor speed limits, then performance and usability are improved, but cost and weight increase
Solution Approach 1:
The patent merges the multi-speed transmission functionality into the planetary gear mechanism that also serves as a differential. By integrating multiple speed reduction stages within the differential structure, the system achieves multi-speed capability without requiring separate transmission components, thereby reducing overall weight and cost.
Solution Approach 2:
The planetary gear mechanism employs nested gear arrangements where multiple gear sets are contained within each other. This nesting allows multiple speed reduction stages to be compactly arranged within a single transmission housing, reducing the overall size and weight of the transmission system while providing multi-speed capability.
3Ease of operation
If an auxiliary stator is added for torque vectoring, then vehicle control and steering capability are improved, but device complexity increases
Solution Approach 1:
The auxiliary stator is integrated into the existing motor structure to provide torque vectoring functionality. By making the stator capable of both generating primary torque and providing differential torque for steering control, the system achieves enhanced vehicle control capability without requiring completely separate control mechanisms, thereby limiting the increase in device complexity.
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 solution enhances torque vectoring for better vehicle control and steering, reduces wheel spin, and improves cooling efficiency, while minimizing weight and complexity, thereby enhancing performance and usability without increasing costs.
Implementation Method 1
cooling fins arranged at the periphery of the main rotatably mounted stator... enables improved cooling of the electric motor as the main rotatably mounted stator rotates through ambient air
Implementation Method 2
cooling fins arranged at the periphery of the main rotatably mounted stator... enables improved cooling of the electric motor
Implementation Method 3
an auxiliary fan unit is provided for producing a flow of cooling air passing over the cooling fins within the air duct cover
Implementation Method 4
an electric motor having a rotor and a main stator rotatably mounted to a support structure
Data Source
Figure 1
Figure 2
AI summary
Embodiments herein relate to a motor vehicle drive unit (1) and an automotive vehicle (17) comprising such a motor vehicle drive unit (1). An electric motor has a rotor (2) and a main stator (3) rotatably mounted to a support structure (4). A first transmission (5) provides an output to a first wheel axle shaft (6) from the rotor (2). A second transmission (7) provides an output to a second wheel axle shaft (8) from the main stator (3). An auxiliary stator (9) at least partially surrounds the main stator (3) and is held stationary relative to the main rotatably mounted stator (3). Means (10) are provided for controlling the auxiliary stator (9) to add or subtract power to the main rotatably mounted stator (3).