Rotating Electric Machine Armature Layout for Flux Leakage Suppression
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Solution Overview
Problem
In rotating electric machines, increasing the surface magnetic flux density of the rotor leads to magnetic saturation on the stator side, causing magnetic flux leakage and limiting torque, especially when using permanent magnets with high residual flux density.
Innovation Solution
A rotating electric machine design that includes a field system with a magnet section having alternating polarities and a soft-magnetic core, along with an armature featuring multi-phase armature coils and inter-conductor members that are magnetically saturated by the magnetic flux from the magnet section when the coils are not energized, ensuring the magnetic flux flows along the designed magnetic circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the surface magnetic flux density of the rotor is increased to improve torque, then the magnetic flux density increases, but magnetic saturation occurs on the stator side causing magnetic flux leakage and limiting further torque improvement
Solution Approach 1:
The inter-conductor members are pre-configured in the armature slots to be magnetically saturated by the rotor's magnetic flux before the armature coils are energized. This preliminary saturation action ensures that the inter-conductor members cannot accept additional magnetic flux when the coils are energized, preventing magnetic flux leakage and maintaining stable magnetic circuit operation throughout the torque generation process
Solution Approach 2:
The inter-conductor members act as intermediary elements between the rotor magnetic flux and the armature coils. By being positioned in the armature slots and pre-saturated by the rotor flux, they serve as a magnetic buffer that prevents flux leakage to the stator core, thereby protecting the magnetic circuit stability while allowing high torque generation
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 configuration effectively suppresses magnetic flux leakage and eliminates torque limitations due to magnetic saturation, allowing for improved torque performance even with high surface magnetic flux density rotors.
Implementation Method 1
The inter-conductor members in each part of the armature corresponding to one magnetic pole are magnetically saturated by magnetic flux from one magnetic pole of the magnet section when the electrical conductor sections are not energized
Implementation Method 2
a magnet section having a plurality of magnetic poles whose polarities alternate in a circumferential direction
Implementation Method 3
an armature arranged to face the field system and including a multi-phase armature coil. The armature coil has electrical conductor sections arranged at positions facing the field system
Data Source
AI summary
A rotating electric machine includes: a field system including a magnet section having a plurality of magnetic poles whose polarities alternate in a circumferential direction; and an armature arranged to face the field system and including a multi-phase armature coil. Either of the field system and the armature is configured as a rotor. The field system also includes a soft-magnetic core having at least one magnet-receiving hole in which the magnet section is received and held. The armature coil has electrical conductor sections arranged at positions facing the field system and at predetermined intervals in the circumferential direction. In the armature, inter-conductor members are provided between the electrical conductor sections in the circumferential direction. The inter-conductor members in each part of the armature corresponding to one magnetic pole are magnetically saturated by magnetic flux from one magnetic pole of the magnet section when the electrical conductor sections are not energized.