PERMANENT MAGNETIC COUPLING DEVICE
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United States of America Patent
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Issued Date -
Apr 2, 2015
app pub date -
Aug 15, 2014
filing date -
Sep 30, 2013
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A permanent magnetic coupling device includes an conductor rotor, an permanent magnet rotor and permanent magnets. The permanent magnet rotor includes a magnetic ring. The magnetic ring includes protrusions and recesses arranged alternately, in which first airflow channels are formed between the protrusions and the conductor rotor respectively, and second airflow channels are formed between the recesses and the conductor rotor respectively. A cross-sectional area of each of the second airflow channels is greater than a cross-sectional area of each of the first airflow channels. The permanent magnet rotor further includes cavities disposed at the recesses, and the permanent magnets are engaged into the cavities respectively.
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