Patent ID: 8294409
Filing Date: 2012-10-23
Classification: H02P

Abstract:
1. A ram air fan control system, comprising: a ram air fan motor for use in driving a ram air fan in an aircraft, the ram air fan motor being a pole-change induction motor with at least two pole-count configurations; a ram air fan motor contactor in operative communication with a first pole-count configuration of the ram air fan motor over a ram air fan motor conductor bus; a ram air fan motor power controller in operative communication with the ram air fan motor contactor; a common contactor in operative communication a second pole-count configuration of the ram air fan motor over a common conductor bus, the common conductor bus being separate and electrically isolated from the ram air fan motor conductor bus; and a common power controller in operative communication with the common contactor; wherein the ram air fan motor contactor electrically couples the first pole-count configuration of the ram air fan motor to the ram air fan motor power controller when the ram air fan motor is operating at low speed and wherein the common contactor electrically couples the second pole-count configuration of the ram air fan motor to the common power controller when the ram air fan motor is operating at high speed.