Segmented Motor Rotor Radial Joints for Centrifugal Strength
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Solution Overview
Problem
Electric motor rotors often waste material during fabrication due to the center of lamination rings being discarded, and segmented rotors face reduced structural strength under high-speed or high-temperature conditions.
Innovation Solution
The rotor is segmented into annular segments with radial joints to provide strength and is assembled using a rotor core with annular lamination stacks that are radially aligned and axially offset, featuring radial joints for affixing to a rotor carrier.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the rotor is made of complete annular lamination rings, then the structural strength is improved, but material waste increases due to the center being discarded
Solution Approach 1:
The rotor is divided into multiple discrete lamination stacks arranged radially around a central hub, eliminating the need to discard the center material. Each lamination stack functions as an independent structural unit that contributes to the overall rotor strength while maximizing material utilization from the blank stock.
2Loss of substance
If the rotor is segmented into multiple lamination stacks, then material waste is reduced, but structural strength decreases under high-speed or high-temperature conditions
Solution Approach 1:
Multiple discrete lamination stacks are radially aligned and mechanically interconnected through a central hub structure, creating a unified rotor assembly that maintains structural integrity. The hub serves as a common mounting surface that binds the segmented stacks together, enabling them to function collectively as a single strong rotor unit capable of withstanding high-speed rotation and thermal expansion.
3Strength
If radial joints are added to connect lamination stacks, then structural integrity is improved, but device complexity increases
Solution Approach 1:
A central hub structure serves as an intermediary component that radially connects multiple lamination stacks. This hub acts as a common interface that simplifies the connection process by providing standardized mounting surfaces and alignment features, reducing the overall assembly complexity despite the increased number of connection points required for structural integrity.
Data Source
AI summary
A rotor may be segmented into annular segments to assist in manufacturing and provide material savings. Switching from a full circle rotor lamination to a segmented lamination may reduce a structural strength of the rotor to resist centrifugal forces and expansion during high speed or high temperature operation. The annular segments may include radial joints to provide sufficient strength to resist against the centrifugal forces.