Multi-phase reactor with rotational symmetry for constant inductance
Solution Overview
Problem
Conventional multi-phase reactors, such as three-phase reactors, face challenges in maintaining a constant inductance across phases due to imbalances between central and peripheral winding cores, leading to difficulties in achieving uniform inductance values for R-phase, S-phase, and T-phase.
Innovation Solution
A multi-phase reactor design featuring a central core surrounded by multiple second cores arranged in a loop shape with rotational symmetry, where each second core has identical radial legs and windings, and core fixing members are used to maintain symmetry and uniformity, allowing for consistent inductance across phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If three winding cores are arranged in a row with predetermined gaps to form a line-symmetric reactor, then the structural symmetry is improved, but the inductance balance between phases deteriorates
Solution Approach 1:
The patent applies asymmetry by changing from a line-symmetric arrangement to a rotationally symmetric arrangement with a central core and surrounding winding cores. This rotational symmetry ensures that all phases have identical magnetic path lengths and inductance values, resolving the inductance balance problem while maintaining structural regularity.
Solution Approach 2:
The patent transitions from a one-dimensional linear arrangement of winding cores to a two-dimensional radial arrangement around a central core. This dimensional change enables rotational symmetry, where each phase winding core is equidistant from the central core, ensuring equal inductance for all phases.
2Ease of manufacture
If winding cores are arranged in a row with gaps, then the assembly simplicity is improved, but the magnetic path uniformity deteriorates
Solution Approach 1:
The patent replaces the line-symmetric arrangement with a rotationally symmetric arrangement where winding cores surround a central core. This ensures that each phase has an identical magnetic path length and cross-sectional area, achieving uniform magnetic properties across all phases while maintaining assembly simplicity through standardized positioning.
Solution Approach 2:
The patent creates equipotential magnetic paths by ensuring that all winding cores are equidistant from the central core and have identical dimensions. This results in equal magnetic reluctance for each phase, ensuring uniform magnetic flux distribution and consistent inductance values.
3Manufacturing precision
If a central core with surrounding winding cores in rotational symmetry is used, then the inductance constancy is improved, but the structural complexity increases
Solution Approach 1:
The patent segments the reactor into a central core and multiple surrounding winding cores, each handling a specific phase. This segmentation allows independent optimization of each phase while maintaining overall symmetry, ensuring constant inductance for each phase without requiring complex inter-phase coupling mechanisms.
Solution Approach 2:
The central core serves multiple functions by providing a common magnetic path for all phases simultaneously. Each surrounding winding core performs dual functions as both a phase-specific magnetic path and a structural element maintaining rotational symmetry, reducing the need for additional components.
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 ensures a constant inductance value for each phase, even under varying current conditions, by optimizing magnetic path resistance and using core fixing members to maintain structural integrity and symmetry.
Implementation Method 1
one or a plurality of windings wound around each of the second cores
Implementation Method 2
a plurality of second cores provided outside the first core and arranged so that each of magnetic paths with respect to the first core is in a loop shape
Data Source
AI summary
A multi-phase reactor is configured to include a first core arranged at a center of the reactor; a plurality of second cores provided outside the first core and arranged so that each of magnetic paths with respect to the first core is in a loop shape; and one or a plurality of windings wound around each of the second cores. With this configuration, the multi-phase reactor capable of setting a constant value of inductance for each phase is provided.