For instance, when the average voltage of the sampled, filtered DC waveform at node 704 exceeds a given threshold, the feedback control will reduce the average current passing through {HEAD ~ the field coil} 721 which in {TAIL ~ turn}, reduces the torque on the impeller while reducing the average armature voltage 
For instance , when the average voltage of the sampled , filtered DC waveform at node 704 exceeds a given threshold , the feedback control will reduce the average current passing through { HEAD ~ the field coil } 721 which in { TAIL ~ turn } , reduces the torque on the impeller while reducing the average armature voltage
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