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flux densities and gap shear stresses generated by the superconducting field coils, HTS motors follow fundamentally different scaling laws than do conven- tional motors. HTS motors scale according to a 1/5 (0.2) power rule instead of the conventional 1/3 (0.3) power rule. This means that very high horsepower HTS motors are not much bigger than more moderate-sized HTS motors. For example, a 25-MW 120- rpm will be only 1.4 times dimensional- ly larger than AMSC's 5-MW HTS motor, despite having five times the power and ten times the torque of the Figure 3 The 36 5 sma"cr machine. Replacing the diesel MW HTS marine w't'1 a §as turbine will remove the propulsion motor design limitations created by the diesel uses technology vali- engine's great size and weight, dated in the U.S. HTS technology also greatly improves Navy's 5-MW Motor today's electric ship propulsion systems. merts63'116' Consider the conversion to electric propulsion of the Queen Elizabeth 2 in 1987. The electric propulsion modifica- tion designers were constrained by the existing engine room layout and volume in which they could install, leading to the selection of two 44-MW 150-rpm synchronous pancake motors. Each weights about 400 cu. tons and measures about 29.5 ft. (9 m) in width and height and about 20 ft. (6 m) in length. Each motor is so large, and the ship's installa- tion restrictions so severe, that each was built, delivered and installed in quarters — two half stators and two half rotors. The motors and the other ship's electric- ity needs are met by nine 10.5-MW medium speed conventional diesel gen- erator sets with a total weight of more than 2,000 tons. Conversion of the QE2 to electric drive was a remarkable achievement. The installation has worked well and the ship continues to operate today as the premier transoceanic cruise ship of our SPURS PROTECTS YOUR FLEET mgjOmniTHRUSTER From net and line entanglements and resulting oil seal damage B * 1 E A TM Murine Maneuvering am! Propulsion Systems Awesome Cutting Action! The Cutting Edge Propeller ^ttj^R Entanglement Solution Spurs Cutter Systems are the world's v-.. most efficient and cost effective method of eliminating propeller v- entanglement and are trusted by U.S. Navy and commercial fleets world- * wide. Spurs instantly cut lines and nets and prevent unscheduled dry- docking due to aft seal damage. Envirc "Oil Leak" ital Challenge Don't take a chance!! Avoid expensive fines and downtime from resulting oil leakage due to line and net intrusion into aft oil seals, (as shown here) • Effective Thrust In Currents • Proudly Made §§§|™ In The USA! HT600 Water Jet Bow/Stern Thrusters 75-2200 HP • Low Submergence Requirement • Small Hull Penetrations JT575AM • Auxiliary Propulsion/ "Take Home" Capability All size Spurs cutters are in stock ready for i™rM««.i»mcMreci immediate shipment and installation at your 'arc Sf^iJf^S ^Ir,, * UNI K NET CUTTER next dry docking. nmmMnan si>w.»«m»»Mtv For more information, or to request a free cd-rom, visit us at: www.spursmarine.com email.spurs@spursmarine.com Phone (954) 463-2707 Fax (954) 525-0239 Spurs Marine 201 SW 33rd Street Ft. Lauderdale, FL 33315 30555 Solon Industrial Parkway • Cleveland, OH 44139 440 5423200 wwwmnithruster.com 28 Circle 214 on Reader Service Card Circle 290 on Reader Service Card Maritime Reporter & Engineering News
