V-Shaped Permanent Magnet Rotor for Iron Loss Reduction
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Solution Overview
Problem
Existing permanent magnet type synchronous rotating electric machines face inefficiencies due to uneven magnetic flux distribution and high iron losses, which affect torque and efficiency.
Innovation Solution
The rotor design features first and second permanent magnets forming a V-shape within the rotor core, with the distance between them increasing towards the outer circumference, optimizing their placement to reduce high magnetic flux density areas and improve magnetic flux distribution, thereby enhancing torque and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If permanent magnets are disposed in a V-shape with asymmetric widths to improve efficiency, then magnet torque is enhanced, but magnetic flux distribution becomes uneven causing high iron losses
Solution Approach 1:
The patent applies local quality by making the permanent magnets have different widths in the longitudinal direction, with the first permanent magnet having a greater width than the second permanent magnet. This asymmetric configuration creates different magnetic flux densities in different regions, optimizing the magnetic flux distribution to reduce iron losses while maintaining high magnet torque output.
Solution Approach 2:
The patent employs asymmetry by disposing the permanent magnets unsymmetrically with respect to the center line that bisects the pole pitch angle. The first and second permanent magnets have different widths and are positioned at different distances from the center line, creating an asymmetric magnetic field distribution that reduces concentrated flux density areas and thereby reduces iron losses while maintaining effective torque generation.
2Productivity
If permanent magnets are disposed unsymmetrically with different widths, then efficiency is improved, but manufacturing complexity increases
Solution Approach 1:
The asymmetric magnet configuration with different widths is implemented within the constraints of standard manufacturing processes. The local quality variation is achieved through controlled magnet placement and dimensioning that can be accommodated by conventional winding and assembly techniques, balancing efficiency improvement with manufacturing feasibility.
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 effectively reduces iron losses and improves both magnet torque and reluctance torque, widening the high efficiency region of the permanent magnet type synchronous rotating electric machine.
Implementation Method 1
first and second permanent magnets forming a magnetic pole are disposed such that a distance between the first and second permanent magnets increases toward the outer circumference of the rotor core
Implementation Method 2
a rotor includes a rotor core the outer circumference of which faces teeth of a stator of a rotating electric machine
Implementation Method 3
optimizing their placement to reduce high magnetic flux density areas and improve magnetic flux distribution
Data Source
AI summary
A rotor includes first and second permanent magnets provided in each magnetic pole inside a rotor core. The rotor is configured such that when a first end of the first permanent magnet located on the outer circumferential side of the rotor core and the second permanent magnet side is located at a position that faces a first end in the circumferential direction of one of teeth of a stator, a second end of the first permanent magnet located on the axis of rotation side of the rotor core and the second permanent magnet side is located at a position that faces a second end in the circumferential direction of the tooth that faces the first end of the first permanent magnet.