Integrated Motor Torque Distribution Redundancy
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Solution Overview
Problem
The series connection of two electrical motors in vehicles increases the axial dimension and weight, compromising the reliability and safety of the driving system.
Innovation Solution
An integrated electrical motor design where the first and second rotors are mounted on the same shaft, and their corresponding stators are fixed on the inner sidewalls of the housing, with controllers managing torque distribution to maintain operation even if one motor malfunctions, reducing weight and axial dimension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two electrical motors are connected in series to maintain operation after one motor malfunctions, then reliability is improved, but axial dimension and weight increase
Solution Approach 1:
The patent combines two electrical motors into a single integrated motor unit where both rotors share a common shaft and housing. This merging approach maintains the redundancy benefit (improved reliability) while eliminating the need for separate motor assemblies, thereby reducing overall weight and axial dimension compared to series-connected motors.
Solution Approach 2:
The integrated motor structure nests one rotor system within the same spatial envelope as the other rotor, with both rotors mounted on a shared shaft inside a single housing. This nested arrangement allows the motor system to achieve redundancy without proportionally increasing external dimensions or weight.
2Reliability
If two electrical motors are connected in series to maintain operation after one motor malfunctions, then reliability is improved, but axial dimension increases
Solution Approach 1:
The patent combines two electrical motors into a single integrated motor unit where both rotors share a common shaft and housing. This merging approach maintains the redundancy benefit (improved reliability) while eliminating the need for separate motor assemblies, thereby reducing overall weight and axial dimension compared to series-connected motors.
Solution Approach 2:
Instead of arranging motor components along the axial direction (which would increase length), the patent utilizes radial arrangement of rotors around a common shaft and distributes components in the circumferential and radial dimensions. This dimensional reorganization maintains redundancy while controlling axial footprint.
3Reliability
If two electrical motors are connected in series to maintain operation after one motor malfunctions, then safety margin is improved, but device complexity increases
Solution Approach 1:
The patent combines two electrical motors into a single integrated motor unit where both rotors share a common shaft and housing. This merging approach maintains the redundancy benefit (improved reliability) while eliminating the need for separate motor assemblies, thereby reducing overall weight and axial dimension compared to series-connected motors.
Solution Approach 2:
The integrated motor design uses shared components (common shaft, single housing, unified control system) that serve multiple functions for both rotor systems. This multi-functionality reduces the number of duplicate parts and simplifies the overall structure while maintaining the safety margin benefits of having two independent rotor-stator systems.
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 integrated motor achieves a compact structure, reduced weight, and enhanced reliability by distributing torque effectively, improving the safety margin and operational reliability of the vehicle's driving system.
Implementation Method 1
the first controller and the second controller control torques of the first rotor and the second rotor by controlling electric currents in the first stator and the second stator
Data Source
AI summary
The present disclosure discloses an integrated electrical motor, comprising at least two sets of corresponding stators and rotors, wherein the at least two sets of corresponding stators and rotors are mounted within the same housing, and are connected to the corresponding controllers, and the rotors are mounted on the same shaft. The total output torque of the electrical motor can be distributed to the shaft from different stator/rotor pairs, and when one or more of the sets of stators and rotors have malfunction, the remaining stators and rotors maintain running. The integrated electrical motor of the present disclosure has compact structure, small axial dimension, distributable torque, high safety margin and high reliability.