## Design of Direct Current Machines |

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air gap amps angle armature ampere turns armature conductors armature core armature diameter armature winding arrangement assume AT/pp axial brush arms calculate centrifugal fan coefficient coil pitch coil sides commutator bars commutator pitch compensating winding connected copper losses Direct Current ducts eddy current equal field form flux density flux per pole highest common factor insulation interpole laminations lap windings large machines layer leakage factor leakage flux leatheroid length of turn liner load magnetic circuit main pole mean length megalines metre mica mm.-thick number of coil number of poles number of slots obtain outhang permeance points pole arc pole length pole pair pole pitch radial reactance voltage rings saturation curve sequence diagram shown in Fig sides per slot singly-closed slot pitch small machines steel teeth thick tooth top turns per pole usual velocity volts watts whilst whole number winding depth wire yoke