Torque Vectoring Motor Stator Overheating Prevention
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Solution Overview
Problem
Conventional torque vectoring devices cause overheating of the torque vectoring motor's stator when the vehicle travels straight forward, leading to potential deterioration due to unbalanced current flow through only one phase stator.
Innovation Solution
The torque vectoring device includes a torque vectoring motor, first and second planetary gear mechanisms, and a differential that allows the motor to rotate even when the vehicle is traveling straight forward, ensuring equal torque distribution to both wheels and preventing excessive current flow through a single stator phase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the torque vectoring motor is controlled so that drive torques to right and left drive wheels become equal when the vehicle is travelling straight forward, then equal torque distribution is achieved, but the torque vectoring motor does not rotate causing current to flow through only a particular phase stator leading to overheating and deterioration
Solution Approach 1:
The patent applies the dynamics principle by making the torque vectoring motor rotate at a low speed even when equal torque distribution is required for straight forward travel. This dynamic rotation prevents current from concentrating in a single phase stator, thereby preventing overheating and deterioration while maintaining the equal torque distribution function.
2Reliability
If the torque vectoring motor rotates even when the vehicle is travelling straight forward, then current flow through a single phase stator is prevented avoiding overheating, but the motor structure and control system become more complex
Solution Approach 1:
The patent applies parameter changes by altering the rotational speed parameter of the torque vectoring motor. The motor rotates at a specifically controlled low speed during straight forward travel, which is sufficient to prevent current concentration in the stator without requiring high speed rotation. This parameter adjustment achieves the reliability improvement while minimizing control 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
This design prevents stator deterioration by allowing the torque vectoring motor to rotate and distribute torque evenly, maintaining the motor's performance and extending its lifespan.
Implementation Method 1
a first planetary gear mechanism which serves as a differential mechanism, a second planetary gear mechanism which serves as a torque distributing mechanism
Implementation Method 2
a torque vectoring motor... a common carrier connected to the torque vectoring motor and pivotally supporting the plurality of first planetary gears and the plurality of second planetary gears
Data Source
AI summary
The torque vectoring device includes a torque vectoring motor, a first sun gear connected to the left drive wheel, a plurality of first planetary gears, a second sun gear, a plurality of second planetary gear formed integrally and coaxially with the first planetary gear, a common carrier to which the torque vectoring motor is connected and which pivotally supports the first and the second planetary gears, a differential ring gear to which the drive torque is inputted, a differential sun gear which is connected to the left drive wheel and a differential carrier which is connected to the second sun gear and at the same time connected to the right drive wheel.