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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1922 Excerpt: ... it moisture proof. The generator stator windings are provided with thermo-couples for measuring the rise in temperature; the leads from these thermo-couples are taken to the main switchboard in the center S 'Fibre. Washer Fig. 59.--U. S. S. New Mexico: Method of Insulating Bolts Securing Generator in place engine room. A section of the stator winding is shown in Fig. 58. The generator bearings are of similar design to the turbine bearings. They are supported on pedestals which are mounted on foundations built in the ship and are not attached to the generator casing. The pedestal at the end of the generator rests on insulation and is secured by insulated bolts, one of which is shown in Fig. 59; by insulating one end of the generator, the possibility of having circulating current through the rotor and bearings is prevented. These currents do not usually occur in turbo generators but when they do they are very troublesome and cause rapid deterioration of the "babbitt" in the bearings; it is therefore best to make sure they can not occur. Main Motors The overall dimensions and the details of the main motors are shown in Figs. 60, 61, 62, 63 and 64. The motors are of the Fig. 6o.--U. S. S. New Mexico: Main Induction Motor double squirrel cage type which has already been described in Chapter IV. These are the first large motors of this type that have been built. They are rated at 7,250 horsepower each, at 167 revolutions per minute, which corresponds to a speed of 21 knots of the ship. The motor stator windings are arranged to provide for pole changing; the pole changing switches are located in the center engine room. One throw of these switches will give 24 poles on the stator of the motor and the other throw will give 36 poles. The arrangement of the...
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