Stella Winding Angular Termination for Rotor Balance
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Solution Overview
Problem
Rotating electric machines operating at high speeds face weight imbalances due to electrical terminations, leading to potential damage from uneven operation.
Innovation Solution
A rotor design with a laminated core and three-phase windings arranged in a 'stella' configuration, where each winding exits the rotor core at specific angular intervals (0°, 120°, and 240°) around the circumference, providing improved weight distribution and balance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrical terminations (solder, heat sinks, etc.) are used in high-speed rotating electric machines, then electrical connections are established, but weight imbalances occur that impede smooth operation
Solution Approach 1:
The patent applies asymmetry by strategically positioning electrical terminations at specific angular intervals (0°, 120°, 240°) around the rotor circumference rather than distributing them uniformly or randomly. This asymmetric arrangement creates a balanced weight distribution pattern that counteracts the imbalance caused by the terminations themselves, allowing reliable electrical connections while maintaining rotor balance stability during high-speed operation
2Ease of manufacture
If windings are positioned at non-uniform angular intervals, then electrical connections are simplified, but weight distribution becomes uneven causing vibration and damage
Solution Approach 1:
The patent applies local quality by assigning specific angular positions (0°, 120°, 240°) to different phase windings, where each location has a predetermined function. This ensures that while each local position is optimized for its specific winding phase, the overall system achieves uniform weight distribution and balanced operation, resolving the contradiction between manufacturing ease and weight distribution uniformity
3Volume of moving object
If electrical terminations are placed close to each other for compact design, then device size is reduced, but weight imbalances increase impeding smooth operation
Solution Approach 1:
The patent resolves the contradiction by transitioning from a one-dimensional compact arrangement to a two-dimensional angular distribution around the rotor circumference. By spacing terminations at 0°, 120°, and 240° angles, the design maintains compact radial volume while achieving balanced weight distribution through circumferential separation, allowing reduced device size without compromising rotor balance stability
Data Source
AI summary
A rotor for a rotating electric machine is described. Embodiments of the apparatus may include a rotor core comprising a plurality of slots, the rotor core comprising a circumference, a first winding comprising a first termination end exiting the rotor core at a first of the plurality of slots, a second winding comprising a second termination end exiting the rotor core at a second of the plurality of slots, wherein the second of the plurality of slots is 120 degrees around the circumference of the rotor core relative to the first of the plurality of slots, and a third winding comprising a third termination end exiting the rotor core at a third of the plurality of slots, wherein the third of the plurality of slots is 240 degrees around the circumference of the rotor core relative to the first of the plurality of slots.