. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . The coils for the field-magnets are wound on spools which are slipped over the castingsand fastened firmlv in position. These being well protected, the liability of mechanical in-jury is reduced to a minimum. In case it is necessary to replace a coil, or to remove the 236 DVXAMO-ELECTRIC MACHINES. armature, the upper half of the field-castiiif? can be readily removed, leaving the parts easilyaccessible
. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . The coils for the field-magnets are wound on spools which are slipped over the castingsand fastened firmlv in position. These being well protected, the liability of mechanical in-jury is reduced to a minimum. In case it is necessary to replace a coil, or to remove the 236 DVXAMO-ELECTRIC MACHINES. armature, the upper half of the field-castiiif? can be readily removed, leaving the parts easilyaccessible. For the purpose of energizing the field-magnets the dynamos are furnished withsmall exciting dvnaraos of the direct-current type. It has been found desirable in somespecial cases to inake the smaller sizes of alternating-current dynamos self-exciting, and tothis end the armatures are wound with an extra or special coil for furnishing current to ener-gize the fields. The exciter is usually placed as shown in Fig. 88. behind the alternatingdynamo, driven bv a belt from a smallpuiley attache<l to the armature-shaft. One exciter isusuallv emplovedwith each alternating-current dynamo, bu
Size: 1631px × 1532px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade189, booksubjectmechanicalengineering
