ROTOR WITH A THERMAL BARRIER AND A MOTOR WITH SUCH A ROTOR
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United States of America Patent
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Issued Date -
Apr 9, 2009
app pub date -
Mar 2, 2007
filing date -
Mar 2, 2006
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The invention provides an electrical line-start motor comprising with a stator and a squirrel cage rotor adapted for rotation around a centre axis. The rotor comprises a squirrel cage winding in which a current is induced by corresponding windings of the stator, and a set of permanent magnets. To protect the magnets from excessive heat, the rotor comprises thermal barriers e.g. in the form of cavities located between the squirrel cage winding of the rotor and the magnets. Due to the thermal barriers, the thermal conductivity in a path between the windings and the magnets are reduced and the magnets are protected.
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