. Electric railway journal . Sectiojial View of Armature of Motor and Armature Ball Bearing of Same Motor weight car motor, a reduction in weight of approxi-mately 50 per cent has been obtained with only 30per cent reduction in power. With a given amount and quality of material themost practical way of increasing the capacity of amotor is by improving ventilation, and the amountof air that can be drawn through a self-ventilatedmotor is mainly dependent on the armature armature speed has, therefore, been increased,and this has led to the use of ball bearings on the 363432302
. Electric railway journal . Sectiojial View of Armature of Motor and Armature Ball Bearing of Same Motor weight car motor, a reduction in weight of approxi-mately 50 per cent has been obtained with only 30per cent reduction in power. With a given amount and quality of material themost practical way of increasing the capacity of amotor is by improving ventilation, and the amountof air that can be drawn through a self-ventilatedmotor is mainly dependent on the armature armature speed has, therefore, been increased,and this has led to the use of ball bearings on the 3634323028262422 100 l 20o X 90 l 18 1800V D_ 80 JJ 16 160070 51 14 14 0 0 use of ball bearings seems to have solved the prob-lem, and their adoption permits the use of a smallerair-gap than would be permissible with sleeve bear-ings. This, of course, increases the efficiency of themotor. Although there is still some question as to theadoption of ball bearings, the records of those whichhave been in service for considerable time indi
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