Dynamo electric machinery; its design, construction, and operation; direct-current machines (1915)
Sheldon, Samuel, 1862-1920, Hausmann, Erich, 1886- joint author · New York, D. Van Nostrand Company; · leaf 274
so that the load may be held after raising it. Brakes areof two types, friction brakes and dynamic brakes. Fric-tion brakes are made in a number of ways, one type of 262 DYNAMO ELECTRIC MACHINERY. which is depicted in Fig. i68. This shows a spring-actu-ated shoe brake which is kept normally in… … Fig. i68. Dynamic braking is accomplished by connecting themotor to operate as a generator which will deliver energyto some local circuit or return it to the supply circuit.Such brakes are generally supplemented by friction brakeswhich become operative when the motor comes to rest andthe dynamic…
Electric machinery
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