HV DC Brushless Torpedo Propulsion Motor

The 6.5-kV HV dc brushless torpedo propulsion motor based on a Lundell-type solid rotor machine design has been chosen as an essential component of the electric torpedo propulsion system. Sea water is employed as a power return when dc power is transmitted by a single wire. The series-type brushless dc motor is controlled by the specially designed static commutator comprised of a bank of series connected thyristors. A photoelectric device is used for the readout of the rotor-stator relative position. This information is used to gate the thyristors in the static commutator. The review of operation involving natural commutation of thyristors and the analog computer simulation of this motor-commutator system is included in the text.