Reluctance Motor Rotor Using Diamagnetic Medium
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Solution Overview
Problem
Existing synchronous reluctance machine rotors face challenges in optimizing the magnetic permeability ratio between the d and q axes, and in simplifying their manufacturing process.
Innovation Solution
The rotor design incorporates a diamagnetic or paramagnetic medium to fill gaps between laminations, acting as both a carrier for the soft-magnetic element and a means to enhance magnetic blocking and axial fixation, replacing traditional metal end disks and reducing the need for radial support ribs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If air gaps are formed in the soft-magnetic element to block magnetic flux along the q-axis, then the magnetic permeability difference between d and q axes is improved, but the structural stability and holding strength of the rotor core deteriorates
Solution Approach 1:
A diamagnetic or paramagnetic medium is introduced as an intermediary substance to fill the gaps between laminations and rotor teeth. This medium serves dual purposes: it maintains the magnetic flux blocking function (like air gaps) while simultaneously providing structural support and holding strength (unlike air). The medium acts as a mediator between the conflicting requirements of magnetic performance and structural integrity.
Solution Approach 2:
The rotor core is constructed as a composite structure combining soft-magnetic laminations with a diamagnetic or paramagnetic filling medium. This composite approach allows the rotor to simultaneously achieve the magnetic flux blocking properties needed for high permeability ratio and the structural strength provided by the solid medium, resolving the contradiction between magnetic performance and mechanical stability.
2Stability of the object's composition
If multiple separate components (metal end disks, radial support ribs) are used to fix the soft-magnetic element and provide structural support, then the structural stability is improved, but the device complexity and manufacturing difficulty increases
Solution Approach 1:
The diamagnetic or paramagnetic medium merges multiple previously separate functions into a single substance: it fills gaps between laminations, provides radial support, prevents lateral displacement, and maintains structural integrity. This consolidation eliminates the need for separate metal end disks and radial support ribs, significantly simplifying the rotor construction while maintaining or enhancing structural stability.
Solution Approach 2:
The diamagnetic or paramagnetic medium performs multiple functions simultaneously: it acts as a magnetic flux barrier, a structural support element, a positioning element, and a binding agent holding the laminations together. This multi-functionality replaces what previously required several separate components, reducing device complexity while achieving the same or better performance.
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 increases the permeability difference between the d and q axes, enhances rotor stability by absorbing radial forces, and simplifies manufacturing by using a single-component diamagnetic or paramagnetic medium for both magnetic blocking and axial fixation.
Implementation Method 1
at least one recess at least partially having a diamagnetic or paramagnetic medium is filled instead of air
Implementation Method 2
at least one recess at least partially having a diamagnetic or paramagnetic medium is filled instead of air
Implementation Method 3
the soft magnetic element (1, 4) is a laminated core (4)
Data Source
Figure 1~4
Figure 5~6b
Figure 7
AI summary
The invention relates to a rotor for a synchronous machine, in particular a reluctance machine, comprising a cylindrically structured, magnetically soft element, wherein the magnetically soft element has openings for forming magnetic flux barriers, which form an even number of salient magnetic poles, wherein at least one opening is at least partially filled with a diamagnetic or paramagnetic medium. The invention also relates to a method for producing such a rotor and to the use of a rotor. The invention further relates to a reluctance motor, in particular a synchronous reluctance motor, that uses the rotor according to the invention.