Reluctance Motor Rotor Insert Disc for High-Speed Stability
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Solution Overview
Problem
Conventional reluctance motors with punched-out sections for flux guidance suffer from mechanical instability at high speeds, limiting their suitability for motor vehicles with electric drives, as the non-magnetic areas weaken the rotor's mechanical stability, making them unsuitable for speeds above 3,000 revolutions per minute.
Innovation Solution
The introduction of insert discs made from polymer films or knitted fabrics impregnated with synthetic resin between layers of the laminated core, which connect flux guidance sections across non-magnetic areas, distributing centrifugal forces radially and enhancing mechanical stability, allowing for higher speed operation without compromising magnetic characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If punched-out sections are used to create flux-guidance sections, then high torque yield is achieved, but mechanical stability deteriorates at high speeds
Solution Approach 1:
The rotor is divided into multiple thin laminated sheets stacked together, with insert discs placed between specific layers. This segmentation allows the flux-guidance sections to be separated into discrete segments that can be independently supported, maintaining structural integrity at high speeds while preserving the torque-generating magnetic flux paths.
Solution Approach 2:
Insert discs made of non-magnetic material are introduced as intermediary elements between the laminated sheets. These insert discs bridge the gaps created by punched-out sections, providing mechanical support and stabilizing the rotor structure without interfering with the magnetic flux guidance, thus resolving the contradiction between torque generation and mechanical stability.
2Reliability
If non-magnetic areas are introduced for flux guidance, then magnetic flux inhibition is improved, but mechanical strength deteriorates
Solution Approach 1:
The rotor employs a composite structure combining magnetic laminated sheets with non-magnetic insert discs. This composite design allows the magnetic sheets to provide flux guidance and inhibition properties while the non-magnetic insert discs provide mechanical strength, with each material performing its optimal function without compromising the other.
3Power
If strip-shaped flux-guidance sections are used, then high torque is produced, but centrifugal force resistance deteriorates at high speeds
Solution Approach 1:
The solution adds the axial dimension to the traditional two-dimensional flux-guidance sections. By stacking multiple laminated sheets with insert discs between them, the rotor creates a three-dimensional structure where centrifugal forces are distributed across multiple layers and supported by the insert discs, enabling high-speed operation while maintaining torque production.
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 solution enables reluctance motors to operate at speeds exceeding 5,000 revolutions per minute, providing both high torque and mechanical stability, making them suitable for electric vehicle drives, while maintaining magnetic properties and reducing the need for metal webs for stabilization.
Implementation Method 1
distributing centrifugal forces radially and enhancing mechanical stability
Implementation Method 2
a rotor for a reluctance motor, wherein the rotor has a laminated core including a number of layers electrically insulated from one another
Implementation Method 3
flux guidance sections are formed by the at least one rotor sheet, which are separated from one another by a non-magnetic area
Implementation Method 4
guide the magnetic flux in the way necessary for providing the necessary reluctance of the rotor
Data Source
AI summary
A rotor for a reluctance motor having a laminate stack of layers is disclosed. Each layer has at least one magnetically-conductive rotor lamination, and in each layer a plurality of flux-conducting sections are formed by the at least one rotor lamination, which flux-conducting sections are separated from one another by a nonmagnetic region. The invention addresses the problem of enabling a high torque and a high speed. For this purpose, an insert disk is arranged between at least two of the layers, connected in each case to at least two flux-conducting sections of one of the layers or both of the layers between which said insert disk is arranged and, as a result, connects said flux-conducting sections to one another beyond the nonmagnetic region located there between.