Double-Rotor Electrical Machine Segmentation for Hybrid Vehicle Efficiency
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Solution Overview
Problem
Electrical rotating machines with double rotors face efficiency drops due to prolonged energy paths and conversion losses, requiring adjustments in torque and speed characteristics for hybrid electric vehicles.
Innovation Solution
A double-rotor electrical rotating machine with a stator, first rotor, and second rotor, featuring salient poles and wound coils that allow adjustable output characteristics by varying the number and type of coils energized, utilizing permeable and non-permeable materials along the rotor periphery to manage magnetic flux and induce current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If energy conversion between mechanical energy and electrical energy is implemented in range extender system, then the electrical rotating machine can operate between traction wheels and internal combustion engine, but conversion losses occur and energy transmission efficiency drops
Solution Approach 1:
The patent divides the single rotor into two separate rotors (first rotor and second rotor) that can rotate independently. This segmentation allows the electrical rotating machine to operate in multiple modes: as a motor driving the traction wheels, as a generator driven by the internal combustion engine, or in direct mechanical coupling mode, thereby reducing energy conversion losses while maintaining operational flexibility.
Solution Approach 2:
The patent implements dynamic configurability where the connection between the first rotor and second rotor can be changed based on operating conditions. The rotors can be coupled together or operated independently through control mechanisms, allowing the system to adapt between different energy transmission paths and minimize losses in real-time.
2Adaptability or versatility
If prolonged energy path is used in range extender system, then the electrical rotating machine can sequence between internal combustion engine and traction wheels, but energy transmission efficiency drops
Solution Approach 1:
By segmenting the rotor into two independently controllable rotors, the patent creates multiple energy transmission paths. The first rotor can be directly coupled to the internal combustion engine while the second rotor drives the traction wheels, or vice versa, or both can work together, thereby shortening the effective energy path and reducing transmission losses.
Solution Approach 2:
The dual-rotor structure acts as an intermediary mechanism between the internal combustion engine and traction wheels. The two rotors can mediate power transmission in different configurations, allowing direct mechanical coupling when needed to bypass prolonged energy paths and reduce transmission efficiency losses.
3Loss of energy
If fixed armature pole coil configuration is used, then the electrical rotating machine works in high efficient operation area, but gearbox is required to drive outside this area
Solution Approach 1:
The patent makes the armature pole coil configuration dynamic by enabling different connection patterns between the first and second rotors. By controlling which rotor is driven and which drives, and by adjusting their relative speeds and torques, the system can operate efficiently across a wider range of speed-torque characteristics without requiring a gearbox.
Solution Approach 2:
The dual-rotor structure provides multi-functionality where the same electrical rotating machine can operate in motor mode, generator mode, or direct coupling mode, and can adjust its speed-torque characteristics by changing the operational configuration of the two rotors, thereby eliminating the need for a gearbox while maintaining high efficiency.
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
Enables adjustable output characteristics with minimal efficiency drop, allowing for efficient torque and speed variations suitable for hybrid electric vehicles, reducing energy conversion losses and enhancing mechanical efficiency.
Implementation Method 1
a stator including armature pole coils capable of generating magnetic flux when energized; a first rotor driven to rotate when the magnetic flux passes therethrough
Implementation Method 2
a second rotor driven to rotate in an electromagnetic path of the magnetic flux that passes through the first rotor
Implementation Method 3
the first rotor includes a plurality of salient poles situated along the periphery of the first rotor and wound by induction coils which induce induced current when linked by the magnetic flux generated by the armature pole coils
Data Source
AI summary
An electrical rotating machine comprises a stator including armature pole coils 14 capable of generating magnetic flux when energized, an inner rotor driven to rotate when the magnetic flux passes therethough, and an outer rotor driven to rotate in a magnetic path of the magnetic flux that passes through the first rotor, the outer rotor having portions of different materials, in permeability, which are situated along the periphery of the outer rotor, the inner rotor having a plurality of salient poles situated along the periphery of the inner rotor and wound by wound coils 34 which induce induced current when linked by the magnetic flux generated by the armature pole coils, the stator including a plurality of wound coils 51, 52, 53 winding around each of poles to constitute the armature pole coil for each of the plurality of salient poles.