Alternating Currents and Alternating Current Machinery: Being Volume II of the Text-book on Electromagnetism and the Construction of DynamosMacmillan, 1896 - 729 páginas |
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Términos y frases comunes
active pressure alternating current alternator armatures ampere-turns amperemeter amperes angle of lag arma armature armature conductors armature core armature current armature reactions arrangement C₁ capacity caused cent condenser connected constant copper losses core losses cuit current flowing diagrams difference dynamo efficiency electric pressure electrodynamometer equal exciting current field formula foucault current frequency full load galvanometer gives hysteresis impedance impressed pressure inches increased induction motors Inst instantaneous iron losses lines of force magnetic circuit magnetic density magnetic leakage maximum measured method mutual-inductance non-inductive number of lines number of turns ohms ordinates output parallel phase poles polyphase power factor pressure curve primary current proportional R₁ ratio reactance rent resistance ring rotating secondary circuit Sect self-inductance shown in Fig shunt single-phase sinusoidal speed synchronism terminals three-phase tion torque Trans transformer two-phase vector velocity voltmeter volts wattless wattmeter watts windings wire zero
Pasajes populares
Página 47 - Henry, which is the induction in a circuit when the electro-motive force induced in this circuit is one international volt while the inducing current varies at the rate of one Ampere per second.
Página 173 - If a circuit is made up of several different materials joined in series with each other, the resistance of the circuit is equal to the sum of the resistances of its several parts.
Página 39 - ... decrease in the current tends to induce a current in the same direction, self-induction may be said to be that property of a circuit that tends to prevent any change in the strength of a current flowing in it. Self-induction has, therefore, been defined as the "inherent quality of an electric current that tends to impede the introduction, variation, or extinction of an electric current passing through an electric circuit.
Página 582 - In the machines which are now commonly built, the impedance of the armature circuit is commonly equal to or larger than twice the resistance, so that a maximum power factor is gained in such synchronous motors by an excitation which gives a counter pressure that is equal to or greater than the impressed pressure.