. Electrical world. circuit be interrupted and again<UDmpleted. the motors will start without the slightest attention. To obtain full-load starting torque, a clutch pulley composed oftwo parts is employed. One part is a split ring which is attachedto the shaft and revolves with it; the other part consists of the pulleyface and an outer shell. This shell being free upon the shaft, re-mains stationary until the armature has attained a considerablespeed, when the ring expands, gripping the shell and causing it torevolve with diminishing slip as the speed of the armature is in-creased, until th
. Electrical world. circuit be interrupted and again<UDmpleted. the motors will start without the slightest attention. To obtain full-load starting torque, a clutch pulley composed oftwo parts is employed. One part is a split ring which is attachedto the shaft and revolves with it; the other part consists of the pulleyface and an outer shell. This shell being free upon the shaft, re-mains stationary until the armature has attained a considerablespeed, when the ring expands, gripping the shell and causing it torevolve with diminishing slip as the speed of the armature is in-creased, until they both revolve at the same speed. A pulley ofdifferent diameter may be used by simply removing the outer shelland substituting one having a pulley of the desired diameter. Thestandard pulleys should be used wherever possible, as they are prop-erly proportioned for the various motors. It is sometimes desirable or even necessary to suspend the motorfrom the wall or ceiling and these motors are constructed to readily. riG. J.— ELEMENTS OF MOTOR. meet these requirements. They may be prepared for wall or ceilingoperation by simply loosening the end shields and turning them 90or 180°, respectively. The importance of this feature in connectionwith an installation in mills or factories where space is limited willbe quickly recognized. The motors lend themselves very readilyalso to direct connection to centrifugal pumps, generators, etc., theconnection being accomplished by means of a clutch coupling. Theycan also be geared or belted to very slow-speed pumps and othermachines. The standard windings are as follows: All sizes up to and in-cluding 3 hp are wound for no volts, and the larger sizes for 220volts; the standard frequency is 60 cycles. The motors will operatesatisfactorily over a range of voltage or frequency 10 per cent, eitherabove or below normal. It should be remembered, however, that alow voltage and high frequency or the reverse have an accumulativeeffect, and the vari
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectri, bookyear1883
