Cyclopedia of Engineering: A General Reference Work on Steam Boilers and Pumps, Steam, Stationary, Locomotive, and Marine Engines, Steam Turbines, Gas and Oil Engines, Producers, Elevators, Heating and Ventilation, Compressed Air, Refrigeration, Types and Management of Dynamo-electric Machinery, Power Stations, Etc, Том 1Louis Derr American technical society, 1915 |
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Cyclopedia of Engineering: A General Reference Work on Steam Boilers ..., Том 1 Повний перегляд - 1919 |
Загальні терміни та фрази
adjusted Allis-Chalmers alternating-current alternators ammeter amperes armature armature coils arranged bearings belt boilers bolted brushes built capacity cast cast-iron Cause cent circuit breaker collector rings commutating poles compound-wound conductors connected construction copper core Crocker-Wheeler Company direct-connected direct-current driving dynamo efficiency Electric Company employed excitation field coils field windings form-wound frame full load fuse heat horsepower inches increase induction motors insulation iron laminations machine machinery magnetic Manufacturing Company Mechanical method motor-generator mounted oil switch operation overload panels phase pipe placed pole pieces polyphase power factor pulley regulation repulsion motor resistance revolutions per minute revolving rheostat rotary converter rotor running series field shaft short-circuited shown in Fig shows shunt shunt-wound single-phase slots smaller sizes speed motors spider squirrel-cage starting stations stator Steam Turbine steel switchboard Synchronous Condenser synchronous motor three-phase tion torque transformers two-phase usually ventilating voltage voltmeter volts wattmeter Westinghouse Wiring Diagram wound
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Сторінка 5 - WILLIAM RIPPER Professor of Mechanical Engineering in the Sheffield Technical School; Member of the Institute of Mechanical Engineers. Author of "Machine Drawing and Design," "Practical Chemistry," "Steam,
Сторінка 11 - SELECTION OF A MACHINE. The voltage, capacity, and type of machine are dependent upon the system to which it is to be connected, and the purpose for which it is to be utilized, but there are certain general features which should be considered in every case. Construction. This should be of the most solid character and guaranteed first-class in every respect, including materials and workmanship. Finish. A good finish is desirable, since it is likely to cause the attendant to take greater care of the...
Сторінка 95 - They should be stamped with about 80 per cent. of the maximum current which they can carry indefinitely, thus allowing about 25 per cent. overload before the fuse melts. With naked open fuses, of ordinary shapes and with not over 500 amperes...
Сторінка 21 - It has been found that the best results are obtained when the tension in the driving side of the rope is only 3 to 4 per cent of the breaking strength.
Сторінка 247 - A converter is a machine employing mechanical rotation in changing electrical energy from one form into another. A converter may belong to either of several types, as follows : A direct-current converter converts from a direct current to a direct current, usually with a change of voltage.
Сторінка 81 - This is accomplished by following substantially the same directions as for starting them, but in the reverse order. A generator operating alone on a circuit can be slowed down and stopped without touching the switches, brushes, etc., in which case the current gradually decreases to zero; and then the connections can be opened without sparking or any other difficulty. However, when a generator is operating in parallel with others, or with a storage battery, it must not be stopped or reduced in speed,...
Сторінка 126 - An iron screw-driver or other tool held between the field magnets near the revolving armature, vibrates very perceptibly as the short-circuited coil passes. Almost any armature, particularly one with teeth, will cause a slight but rapid vibration of a piece of iron held near it; but a short circuit produces a much stronger effect only once per revolution. Care should be taken not to let the piece of iron be drawn in and jam the armature. The current pulsates and torque is unequal at different parts...
Сторінка 21 - Belting. There are two methods of arranging rope transmission: one consists in using several separate belts; and the other employs a single endless rope which passes spirally around the pulley several times and is brought back to the first groove by a slanting idle pulley, and therefore is called the "wound
Сторінка 47 - The fields of series motors are sometimes "overwound," that is, so wound that they will have their full strength with even one-half or one-third of the normal current. The objects are to secure a nearly constant speed with varying loads, to enable the motor to run at high efficiency when drawing small currents, and to prevent sparking at heavy loads. In multipolar motors having more than two field-coils, the coils are all connected together, and are equivalent to the single pairs of coils shown in...