. Practical wireless telegraphy; a complete text book for students of radio communication . ed across each set of adjacent segments. If one of the coils is open a reading of the voltmeter will be obtained across adjacent segments on one side but no reading will be had on the open side until the open coil is bridged, when a much larger reading than between two segments on the opposite side will be secured. A millivoltmeter is often required for this test, depending upon the resistance of the individual armature coils. If but one or two coils in a motor armature are short-circuited, the motor ca
. Practical wireless telegraphy; a complete text book for students of radio communication . ed across each set of adjacent segments. If one of the coils is open a reading of the voltmeter will be obtained across adjacent segments on one side but no reading will be had on the open side until the open coil is bridged, when a much larger reading than between two segments on the opposite side will be secured. A millivoltmeter is often required for this test, depending upon the resistance of the individual armature coils. If but one or two coils in a motor armature are short-circuited, the motor can be operated temporarily by placing a small wire jumper across the segments of the defective coil. This will throw a heavier load on the remaining coils but the motor can be at least operated for brief periods. A short-circuited motor armature coil will have to be removed and replaced by a new one, but this repair should only be undertaken by a skilled mechanic. The additional troubles which may be encountered are: (1) Sparking at the brushes. (2) The commutator may be rough and uneven. Fig. 329—Showing How to Find a Grounded ArmatureCoil.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1917
