File:Cyclopedia of applied electricity - a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric (14779972722).jpg

Identifier: cyclopediaofappl05amer (find matches)
Title: Cyclopedia of applied electricity : a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric railways, power stations, switchboards, power transmission, alternating-current machinery, telegraphy, etc.
Year: 1916 (1910s)
Authors: American Technical Society
Subjects: Electric engineering
Publisher: Chicago : American Technical Society
Contributing Library: Northeastern University, Snell Library
Digitizing Sponsor: Northeastern University, Snell Library

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nreversing the current as the armature coils pass under the brushes,at which time they are short-circuited for an instant. The motorsare located in the cab where they are free from dirt and dampnessso that the frames can be entirely open. This assists in ventilatingthe motors and permits them to carry their load without overheating. 362 ELECTRIC RAILWAYS 265 ALTERNATING CURRENT LOCOMOTIVES—SINGLE PHASEThe New Haven Qearless Locomotive. The New York, NewHaven and Hartford Railroad was one of the first to adopt electricityfor motive power on a large scale. This railroad took a radical stepin selecting alternating-current series motors for their locomotives.This type of motor permits the use of a high trolley voltage, so thatthe transmission efficiency is high. By means of transformers carriedon the cars the voltage is reduced to that necessary for the motors.The essential features of the series motor as adapted to alter-nating-current circuits were explained earlier in the course. The
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Fig. 253. Armature and Commutator of Pennsylvania Motor electrical connections are the same as in the direct-current seriesmotor but the field must be weak, the magnetic circuit must belaminated, a compensating winding to neutralize the magnetic effectof the armature on the field must be provided, and high-resistanceleads must be placed between the armature winding and the com-mutator bars to keep down the current which would flow in the coilsshort-circuited by the brushes due to their presence in an alternatingmagnetic field. The design and structural difficulties resulting from the above 363 266 ELECTRIC RAILWAYS features have been overcome and a perfectly satisfactory motor isnow available. These motors have been in use for years on theNew Haven Railroad and in other places with entire success. The early New Haven locomotives consisted of a body mountedupon two swivel trucks each containing two 250-h. p., single-phase,series motors, requiring about 450 volts for full capacity opera

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