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. (1916)
American Technical Society · Chicago : American Technical Society · leaf 52
kage through the opening \n the ring core, the internalparts of the winding would produce an e. m. f. in the opposite direction to that generaleJby the outer sections, thus decreasing the effective voltage. 41 32 DIRECT-CURRENT DYNAMOS plete form, they were first brought out in 1871 by Von Hefner… … Fig. 35. Partly-Wound Drum Armature scribed, mounted upon a supporting cylinder of magnetic material.The latter is used in place of the wooden cores of the earlier Siemensform in order to reduce the magnetic reluctance of the gap between the two faces of the field-magnetpoles. This type of armature…
Electrical engineering
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