Polygonal shaft hole rotor

Patent · Tue Jan 23 00:00:00 EST 2001

OSTI ID:947155

Hussey, John H ^[1]; Rose, John Scott ^[2]; Meystrik, Jeffrey J ^[3]; White, Kent Lee ^[4]

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1. St. Louis, MO
2. Alton, IL
3. Webster Groves, MO
4. Maryland Heights, MO

A laminated rotor for an induction motor has a plurality of ferro-magnetic laminations mounted axially on a rotor shaft. Each of the plurality of laminations has a central aperture in the shape of a polygon with sides of equal length. The laminations are alternatingly rotated 180.degree. from one another so that the straight sides of the polygon shaped apertures are misaligned. As a circular rotor shaft is press fit into a stack of laminations, the point of maximum interference occurs at the midpoints of the sides of the polygon (i.e., at the smallest radius of the central apertures of the laminations). Because the laminates are alternatingly rotated, the laminate material at the points of maximum interference yields relatively easily into the vertices (i.e., the greatest radius of the central aperture) of the polygonal central aperture of the next lamination as the shaft is inserted into the stack of laminations. Because of this yielding process, the amount of force required to insert the shaft is reduced, and a tighter fit is achieved.

• Research Organization: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: W-7405-ENG-48
• Assignee: Emerson Electric Co. (St. Louis, MO)
• Patent Number(s): 6,177,749
• Application Number: 09/190,644
• OSTI ID: 947155
• Country of Publication: United States
• Language: English