Electrical news and engineering . On e of a bat ery of three 1400 , 220 volt. 232 r , syn- chro lous m otor s driv- ing magaz me grind- ers i 1 Bron ipto 1 Pulp & Paper Co. s mill East Angus. Que. Installation de in 1920 THE ELECTRICAL NEWS. Mills. Port Arthu and signalling equipment. ted. An example ot while indeterminate, is always greater under load, and isusually higher than the assumed figure of 1.) per cent, asafer estimate for this loss being at least ; per cent andit may even be higher The First Motor DrivesThe first motor drives naturally followed close the former me
Electrical news and engineering . On e of a bat ery of three 1400 , 220 volt. 232 r , syn- chro lous m otor s driv- ing magaz me grind- ers i 1 Bron ipto 1 Pulp & Paper Co. s mill East Angus. Que. Installation de in 1920 THE ELECTRICAL NEWS. Mills. Port Arthu and signalling equipment. ted. An example ot while indeterminate, is always greater under load, and isusually higher than the assumed figure of 1.) per cent, asafer estimate for this loss being at least ; per cent andit may even be higher The First Motor DrivesThe first motor drives naturally followed close the former methods, the motor replacing the engine or waterwheel, as the case might be, the mechanical transmissionto a great extent being retained, and often where installedin existing mills the former prime mover was held in reserveto pick up the load in case of trouble. With the growingappreciation of the reliability, economy and high efficiencyof motor drive the applications increased, the requirementsof individual machines were accurately determined andspecial equipment was developed suitable for the serviceto be performed. Two Main Types of DriveIn the application of motors, two systems are in gen-eral use which are commonly known as group and indi
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