They are supplied by two manufacturers and
differ in respect to important features of design and construction,
but both are believed to be thoroughly adequate for the intended
service.
[Illustration: 200 H. P. RAILWAY MOTOR]
The photographs on this page illustrate motors of each make. The
weight of one make complete, with gear and gear case, is 5,900 pounds.
The corresponding weight of the other is 5,750 pounds. The ratio of
gear reduction used with one motor is 19 to 63, and with the other
motor 20 to 63.
[Illustration: 200 H. P. RAILWAY MOTOR]
[Sidenote: _Motor
Control_]
By the system of motor control adopted for the trains, the power
delivered to the various motors throughout the train is simultaneously
controlled and regulated by the motorman at the head of the train.
This is accomplished by means of a system of electric circuits
comprising essentially a small drum controller and an organization of
actuating circuits conveying small currents which energize electric
magnets placed beneath the cars, and so open and close the main power
circuits which supply energy to the motors. A controller is mounted
upon the platform at each end of each motor car, and the entire train
may be operated from any one of the points, the motorman normally
taking his post on the front platform of the first car. The switches
which open and close the power circuits through motors and rheostats
are called contactors, each comprising a magnetic blow-out switch and
the electro magnet which controls the movements of the switch.
Pages:
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146