Asymmetric Magnet Arrangement in Rotating Electrical Machine Rotor
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Solution Overview
Problem
Conventional rotating electrical machines using permanent magnets embedded in a rotor core require a large amount of magnets to achieve desired torque, leading to higher costs.
Innovation Solution
A rotating electrical machine design with a rotor core made of soft magnetic material, featuring main magnets magnetized in the circumferential direction and auxiliary magnets in the radial direction, where the main magnets are asymmetrically arranged around a virtual line passing through the rotation axis, reducing the number of magnets needed while maintaining torque efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a large amount of permanent magnets is used in the rotor, then the torque output is increased, but the cost of the rotating electrical machine increases
Solution Approach 1:
The permanent magnets are segmented into two distinct types: main magnets magnetized in the circumferential direction and auxiliary magnets magnetized in the radial direction. This segmentation allows each type of magnet to contribute differently to torque generation, optimizing the overall torque output while reducing the total amount of permanent magnets required compared to conventional single-type magnet configurations.
Solution Approach 2:
The main magnets are arranged asymmetrically with respect to the auxiliary magnets in the circumferential direction. Specifically, the main magnets are positioned at locations that are not symmetric about the radial line passing through the auxiliary magnet center, creating an asymmetric magnetic flux distribution that enhances torque generation efficiency and allows for reduced magnet quantity.
2Force
If conventional magnet arrangement is used, then the structure is simple, but the torque output is insufficient
Solution Approach 1:
The magnet arrangement is segmented into auxiliary magnets positioned radially and main magnets positioned circumferentially with asymmetric placement. This segmentation creates a more complex structure that enables enhanced torque output through optimized magnetic flux distribution, where auxiliary magnets provide radial flux and main magnets provide circumferential flux that combines to generate higher torque.
Solution Approach 2:
The auxiliary magnets and main magnets perform complementary functions: auxiliary magnets magnetized in the radial direction provide a base magnetic flux, while main magnets magnetized in the circumferential direction add an asymmetric flux component. Together, they create a multi-functional magnetic system that generates higher torque than either magnet type could achieve alone, justifying the increased structural 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 enhances torque production with fewer magnets by inclining the magnetic flux vector, resulting in increased torque output while minimizing magnet usage, with optimal results achieved when the main magnets are arranged within a specific central angle range relative to the auxiliary magnet's fan-shaped region.
Implementation Method 1
the vector of the magnetic flux of the main magnets directed toward the stator (teeth thereof) is assisted by the magnetic flux from the auxiliary magnet to be formed so as to be inclined relative to the radial direction of the outer circumferential surface of the rotor
Implementation Method 2
with such an inclined vector of the magnetic flux, a vector as a driving force of the rotor is generated along the tangential direction of the rotor, so that the torque of the rotating electrical machine can be secured
Data Source
AI summary
A plurality of auxiliary magnets is embedded in a rotor core so as to surround the rotation axis of the rotating electrical machine in the cross-section orthogonal to the rotation axis. A plurality of main magnets is embedded in the rotor core so as to extend from the auxiliary magnet in the outer circumferential direction of the rotor. A plurality of magnetic poles of the rotor is formed around the rotation axis, the magnetic poles each having the auxiliary magnet and the plurality of main magnets arranged at a distance from each other in the circumferential direction of the rotor, and the plurality of main magnets of each magnetic pole is arranged asymmetrically about a virtual line passing the rotation axis and axisymmetrically dividing the auxiliary magnet of each magnetic pole.