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Title: Polygonal shaft hole rotor

Abstract

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.

Inventors:
 [1];  [2];  [3];  [4]
  1. (St. Louis, MO)
  2. (Alton, IL)
  3. (Webster Groves, MO)
  4. (Maryland Heights, MO)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
947155
Patent Number(s):
6,177,749
Application Number:
09/190,644
Assignee:
Emerson Electric Co. (St. Louis, MO) OAK
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Patent
Country of Publication:
United States
Language:
English

Citation Formats

Hussey, John H., Rose, John Scott, Meystrik, Jeffrey J., and White, Kent Lee. Polygonal shaft hole rotor. United States: N. p., 2001. Web.
Hussey, John H., Rose, John Scott, Meystrik, Jeffrey J., & White, Kent Lee. Polygonal shaft hole rotor. United States.
Hussey, John H., Rose, John Scott, Meystrik, Jeffrey J., and White, Kent Lee. Tue . "Polygonal shaft hole rotor". United States. https://www.osti.gov/servlets/purl/947155.
@article{osti_947155,
title = {Polygonal shaft hole rotor},
author = {Hussey, John H. and Rose, John Scott and Meystrik, Jeffrey J. and White, Kent Lee},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jan 23 00:00:00 EST 2001},
month = {Tue Jan 23 00:00:00 EST 2001}
}

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