. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . this commutating zonebe of small value. Bv the use of inter- poles a flux is formed which opposes thisflux in the commutating zone and reducesit to a minimum. As a result the voltagebetween bars at the brush is very low, toolow to cause a spark as the commutatorbars leave the brush, Since there are nosparks at the brush to start a flash thecommutating-pole motor will not dashover under conditions which would causethe non-commutating motor to do so. big. 1 shows a portion of the motorand ynes
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . this commutating zonebe of small value. Bv the use of inter- poles a flux is formed which opposes thisflux in the commutating zone and reducesit to a minimum. As a result the voltagebetween bars at the brush is very low, toolow to cause a spark as the commutatorbars leave the brush, Since there are nosparks at the brush to start a flash thecommutating-pole motor will not dashover under conditions which would causethe non-commutating motor to do so. big. 1 shows a portion of the motorand ynes diagrammatically the currentand magnetism in the different parts ofa Westinghouse interpole motor. Thecommutator, brushes, armature winding,commutating poles and main pole aresin wn and the lines of Hun or magnetismare also drawn in. In the non-commutating motor thecurrent flowing in the armature coils setsup a flux through the core (the iron partof the armature) and around the polepieces. This flux or magnetism partiallypasses through the short-circuited coilsundergoing commutation and causes all. DIAGRAMMATIC SKETCH OF MAGNETISM AND CURRENT IN A WESTINGHOUSE RAILWAY MOTOR. the trouble. This armature magnetismdepends on the amount of current in thecoils so that as the load, increases themore chance of flashing. The inter or commutating poles areplaced opposite the brushes and they areconnected in the circuit so that the samecurrent that passes through the coils willpass through the interpoles. These com-mutating poles send flux through thecoils in the opposite direction to thatcaused by the armature coils, thus killingthis latter flux and making a perfect com-mutating motor. The elimination of sparking not onlyreduces the chances of flashing orbucking but it prevents the deteriora-tion of the brushes and long mileage isobtained. Effect of Voltage on Railway MotorPerformance. That the speed of a railway motor isincreased or decreased as the voltage atits terminals is raised or
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectrailroa, bookyear1901
