Segmented Rotor Core Layout for Electric Machine Vibration Suppression

The rotor core is divided into multiple segments along the axis direction, with each segment having a specific width. By dividing the rotor core into multiple parts (first rotor core, second rotor core, third rotor core), the patent reduces vibration caused by electromagnetic excitation forces while maintaining manageable complexity through systematic segmentation rather than arbitrary division.

The patent applies specific parameter relationships to determine the optimal division configuration. The width ratios between rotor core segments are defined by specific inequalities (γ≥ε when α>β, and γ≤ε when α<β), which provides a clear parameter-based method for reducing vibration without requiring complex optimization processes.

Different segments of the rotor core are given different local characteristics through specific width ratios. The first rotor core has width γ, the second has width δ, and the third has width ε, with specific relationships between these widths based on bearing distances. This local differentiation allows vibration suppression while providing clear manufacturing guidelines for each segment.

The patent establishes clear parameter relationships (γ≥ε or γ≤ε depending on α>β or α<β) that guide manufacturing precision requirements. Rather than requiring arbitrary precise control, the patent provides specific parameter inequalities that define acceptable ranges, making manufacturing more straightforward while still achieving vibration suppression.