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 271
ent, that is, one behind theapplied voltage, as in an inductance coil. If the field excitationis normal, that is, of such a value that the current in the motorarmature is exactly opposed in phase to the counter-electromotiveforce (unity power factor), then the effective value of this currentwill be… … it-*c/r//^^ Current Fig. 201. Curve Showing Variation of ArmatureCurrent with Field Excitation 238 ALTERNATING-CURRENT MACHINERY 227 mission system as a whole, the most efScient point of operation iswith unity power factor, or, in other words, with a field excitationwhich will make the armature…
Electrical engineering
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