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DIRECTCURRENT MOTOR CONSTRUCTION
PERFORMANCE CHARACTERISTICS OF FRAC
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3-phase air gap amp per sq amp-turns angle approximately armature core armature current armature reaction bars brush capacitor cent characteristics coil sides commutator component conductors constant copper loss current density curve d.c. motor diameter displacement dynamometer e.m.f. induced effect electrical employed equal evident excitation flux density frequency friction full-load given Hence hysteresis increase indicated by Fig induced e.m.f. induction motor input iron loss lagging laminated leakage load magnetic circuit magnetizing current means motor of Fig no-load number of turns obtained ohms operating output phase pole pitch polyphase power factor proportional reactance Referring to Fig repulsion motor respectively rotating field rotor current self-induction series motor shaft short-circuited shown by Fig single-phase slip slots small motors sq cm squirrel-cage rotor starting torque starting winding stator and rotor stator winding supply voltage synchronous motor synchronous speed tachometer teeth thyratrons vector voltage volts watts zero