Shared-Magnetic-Circuit Multi-Rotor Motor for Higher Power Density
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Solution Overview
Problem
Existing multiple-rotor electric machines are heavier and less powerful than desired, with inefficiencies in material usage and power output.
Innovation Solution
A multi-rotor electric machine design featuring a stator, two rotors magnetically coupled to the stator, and a common gear drivingly coupled to both rotors, with rotors arranged in triplets sharing a magnetic circuit to reduce material usage and enhance power output, allowing for efficient power transfer and increased power-to-weight ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple rotors are used to enhance power output, then power increases, but weight increases and efficiency decreases
Solution Approach 1:
The patent combines multiple rotors (first rotor and second rotor) with a common gear system and shared magnetic circuit, allowing power multiplication without proportional weight increase. The rotors share common structural and magnetic components, enabling the machine to achieve enhanced power output while avoiding the weight penalty of completely separate rotor assemblies.
Solution Approach 2:
The common gear serves multiple functions by being drivingly coupled to both the first rotor and second rotor, acting as a shared transmission element. This multi-functional component enables power synthesis from multiple rotors through a single gear mechanism, reducing the need for separate transmission systems for each rotor and thereby reducing overall weight.
2Power
If multiple rotors are used to enhance power output, then power increases, but material usage efficiency decreases
Solution Approach 1:
The patent implements a shared magnetic circuit that serves both the first rotor and second rotor, allowing magnetic flux to be utilized by multiple rotors simultaneously. This shared magnetic path eliminates the need for duplicate magnetic circuits for each rotor, significantly improving material usage efficiency while maintaining enhanced power output capability.
Solution Approach 2:
The common gear and shared magnetic circuit components perform multiple functions within the system, serving both rotors rather than requiring dedicated components for each rotor. This multi-functionality reduces the total quantity of materials needed while achieving the desired power enhancement through multiple rotors.
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 design achieves a significant increase in power output by up to 50% without substantial weight addition, optimizing power density and efficiency through shared magnetic components and phased rotor operations.
Implementation Method 1
a first rotor magnetically coupled to the stator and rotatably mounted relative to the stator; a second rotor magnetically coupled to the stator
Data Source
AI summary
A multi-rotor electric machine having a stator, a first rotor magnetically coupled to the stator and a second rotor magnetically coupled to the stator is disclosed. A method of operating the electric machine comprises driving a gear via a first face of the gear using the first rotor and driving the gear via a second face of the gear using the second rotor.