Spherical rotor for electrical motors
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United States of America Patent
Stats
-
Apr 8, 1986
Grant Date -
N/A
app pub date -
Jan 25, 1984
filing date -
Jan 25, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Process for the manufacture of rotors for asynchronous electrical motors with spherical air gaps. These rotors are designed as permanent magnets with low coercive force and comparably high electrical conductivity so that eddy currents can be formed as long as rotor rpm is different from the frequency of the rotating field of the stator while these rotors convert to permanent magnets running under synchronous conditions at rated performance. The process steps are the following: 1. Milling an iron alloy with at least 5% cobalt to a sheet metal strip. 2. Producing of rings by stamping. 3. Annealing the rings to at least 1050.degree. C. 4. Forming the rings to semi-spherical caps by a deep-drawing process at the annealing temperature pursuant to 3.
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