The Advanced Induction Motor

The ALSTOM Advanced Induction Motor has evolved over a period of around 15 years, during which time function and performance have steadily improved. In the electric warship, compactness of the propulsion motor is important, but so also must be reliability, structureborne noise signature, and shock withstand ability. This has been achieved in the Advanced Induction Motor through optimization of the electromagnetic design and material properties to suit the operating conditions of a propulsion motor. One of the advantages of an induction motor is its mechanical simplicity. This leads to not only to inherent reliability, but also to simpler design for shock requirements. Through careful motor and system design, it has been possible reduce structureborne noise signatures to levels that permit hard mounting of the motor to the hull of a surface combatant. The paper reviews the evolution of the Advanced Induction Motor from industrial induction motors, and the considerations necessary to achieve low noise signature and shock requirements.