Patent ID: 9093879
Filing Date: 2015-07-28
Classification: B01D,H02K

Abstract:
1. A method for reducing concentrations of ozone and nitric acid produced in cooling air flowing through a circulating airflow path of a rotary electric machine, the method comprising: disposing an ozone decomposition unit comprising an ozone decomposition catalyst and a nitric acid adsorption unit comprising a nitric acid adsorbent in parallel with respect to a flow of the cooling air in the circulating airflow path so that in one-pass the cooling air in the circulating airflow path passes through only one of the ozone decomposition catalyst or the nitric acid adsorption unit; and passing a portion of the cooling air through the ozone decomposition unit, thereby decomposing ozone; and passing the remaining portion of the cooling air through the nitric acid adsorption unit, thereby adsorbing and removing nitric acid.