Practical applied electricity; a book in plain English, for the practical man. Theory, practical applications and examples (1911)
Moreton, David Penn, 1882- · Chicago, The Reilly & Britton co · leaf 225
Fig. 177 227. Elevator and Crane Motors.—There are many dif-ferent forms of elevator and crane motors on the market andthe electrical operation of all of them is practically the sanie.In the majority of cases some kind of a brake is providedso that the load may be held after it is raised. These… … Fig. 178 The friction brake is usually controlled by a solenoid. Whenthe motor is operating, the solenoid is energized and thebrake does not act. If the motor is disconnected from the DIRECT-CURKENT MOTORS 215 line and the solenoid de-energized, the brake clamps a pulleyand prevents the armature…
Electrical engineering
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