Motor Rotor Iron Core Structure for High-Speed Rigidity
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Solution Overview
Problem
Conventional spindle motor rotor designs face challenges in structural rigidity and stress concentration under high-speed rotation, particularly due to centrifugal forces, and the use of through holes for bolt insertion can reduce rotor strength and machining accuracy.
Innovation Solution
The iron core structure incorporates a plurality of through-hole-shaped spaces on the rotor iron core, featuring magnetic barrier spaces and adjacent through holes with varying diameters, allowing for the insertion of non-permeability magnetic coupling elements to enhance rigidity and prevent displacement, thereby improving the structural integrity and positioning of silicon steel plates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If through holes are used for bolt insertion to fix silicon steel plates, then the fixation and combination of iron core silicon steel plates is achieved, but the rotor strength is reduced due to stress concentration
Solution Approach 1:
The invention extracts the harmful function of traditional through-holes (which cause stress concentration) and replaces them with groove structures that do not penetrate the rotor. The grooves are confined to specific regions and do not compromise the overall structural integrity, thereby maintaining rotor strength while achieving the fixation function.
Solution Approach 2:
The coupling elements are nested within the groove structures, forming a hierarchical arrangement where the grooves provide the structural framework and the coupling elements provide the fastening function. This nested arrangement allows fixation without requiring through-holes that would weaken the rotor.
2Stability of the object's composition
If the diameter of the spindle is increased to improve rigidity, then the rigidity and machining accuracy are improved, but the radial thickness of the rotor element is reduced
Solution Approach 1:
The invention segments the rotor structure by introducing groove structures that divide the rotor into distinct regions. These grooves provide structural reinforcement and improve rigidity without requiring an increase in the overall spindle diameter, thereby preserving the radial thickness of the rotor element.
Solution Approach 2:
Instead of improving rigidity by increasing the radial dimension (spindle diameter), the invention introduces structural features in the axial and circumferential dimensions through the groove structures. This dimensional approach allows rigidity enhancement without compromising the radial thickness.
3Reliability
If conventional arc-shaped hole walls are used in magnetic barrier holes, then stress concentration damage is limited to the narrowest area, but the overall structural rigidity is insufficient for high-speed rotation
Solution Approach 1:
The invention merges the stress mitigation function (originally achieved through arc-shaped hole walls) with the rigidity enhancement function by integrating groove structures that serve both purposes. The grooves provide structural reinforcement while their design prevents stress concentration, achieving both reliability and rigidity simultaneously.
Solution Approach 2:
The rotor iron core structure combines the magnetic barrier material with the groove structures to create a composite configuration. This composite structure provides both the stress concentration mitigation of the magnetic barrier and the rigidity enhancement of the groove features, enabling high-speed rotation capability.
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 improves the safety factor and mechanical performance of the rotor iron core, reducing deformation and damage from centrifugal forces while maintaining electromagnetic properties and strength.
Implementation Method 1
a plurality of straight rod-shaped coupling elements made of non-permeability magnetic material to fix an overlapping state of a plurality of silicon steel plates
Implementation Method 2
an inner diameter of the first side of the magnetic barrier space is greater than an inner diameter of the second side... so that the coupling element inserted into the through hole will not be displaced radially
Implementation Method 3
suppress the stress on the spindle motor rotor caused by centrifugal force under high-speed rotation
Data Source
AI summary
Main technical features of an iron core structure of motor rotor provided by the invention are that on a rotor iron core of a rotating motor, along a circumferential direction of a rotation axis of the motor as a center of circle, a plurality of through-hole-shaped spaces spaced apart from each other are arranged on the iron core in sequence. When the through-hole-shaped spaces form obstacles to a magnetic circuit in the rotor, the through-hole-shaped spaces are also provided for insertion of a plurality of straight rod-shaped coupling elements made of non-permeability magnetic material to fix an overlapping state of a plurality of silicon steel plates of the iron core in order to improve an overall rigidity of the iron core and reduce a possibility of deformation or damage of the silicon steel plates caused by centrifugal force of high-speed rotation.