Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1998-12-23
1999-11-30
Ramirez, Nestor
Electrical generator or motor structure
Dynamoelectric
Rotary
310 42, 29596, 192 841, H02K 4902
Patent
active
059948108
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND
The present invention generally relates to eddy current drives, relates particularly to improved drive components for eddy current drives, and relates specifically to improved integral drive components for eddy current drives.
In a typical eddy current drive, a first, magnetic field producing drive component such as in the form of permanent magnets is mounted for rotation with one of the input or output of a rotational control apparatus such as a clutch for magnetically coupling with a second, coupling drive component mounted for rotation with the other of the input or output. The second, coupling drive component was typically in the form of a first ring formed of electrically conductive material such as copper sandwiching a second ring of magnetic flux conductive material such as steel against a mounting body portion formed of heat conductive material such as aluminum so that the body portion acts as a heat sink. Screws extended through the first and second rings and were threaded into the body portion.
Prior coupling drive components suffered from various problems and deficiencies. Specifically, heat is generated in the copper ring but its transfer to the body portion is restricted by the steel ring positioned between the copper ring and the body portion. Additionally, when exposed to heat, copper will oxidize reducing the efficiency of the eddy current drive. Further, the mechanical attachment of the steel and copper rings to the body portion increases the number of components and assembly required and is subject to loosening and/or separating and thereby detrimentally affecting reliability.
Thus, a need exists for improved coupling drive components for eddy current drives which overcome the problems and deficiencies of prior eddy current drives.
SUMMARY
The present invention solves this need and other problems in the field of eddy current drives by providing, in the preferred form, an improved, integrally formed drive component including a ring formed of magnetic flux conductive material (steel) embedded in a body portion formed of generally nonmagnetic, heat conductive material (aluminum) to provide magnetic coupling in an eddy current drive.
Thus, it is an object of the present invention to provide a novel eddy current drive including first and second drive components rotatable with the input and the output.
It is further an object of the present invention to provide a novel magnetic coupling drive component for an eddy current drive.
It is further an object of the present invention to provide such a novel magnetic coupling drive component of a one-piece construction.
It is further an object of the present invention to provide such a novel magnetic coupling drive component which is not subject to loosening and/or separating.
It is further an object of the present invention to provide such a novel magnetic coupling drive component having a significant decrease in assembly requirements.
It is further an object of the present invention to provide such a novel magnetic coupling drive component having reduced inventory requirements.
It is further an object of the present invention to provide such a novel magnetic coupling drive component eliminating copper oxidation problems.
It is further an object of the present invention to provide such a novel magnetic coupling drive component which rapidly dissipates heat.
It is further an object of the present invention to provide such a novel magnetic coupling drive component having improved reliability.
These and further objects and advantages of the present invention will become clearer in light of the following detailed description of an illustrative embodiment of this invention described in connection with the drawings.
DESCRIPTION OF THE DRAWINGS
The illustrative embodiment may best be described by reference to the accompanying drawings where:
FIG. 1 shows a cross-sectional view of a rotational control apparatus in a preferred form of a fan clutch including an eddy current drive according to the preferred teachings of the present invention.
F
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Carlson Kent
Davis John B.
Vatsaas Rick
Horton, Inc.
Kamrath Alan
Mullins B.
Ramirez Nestor
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