LEESON Basic Training - Electric Heaters,Level …

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Basic TRAININGMOTORS, GEARS & DRIVESINDUSTRIAL-DUTY & COMMERCIAL-DUTYElectric MotorsGear ReducersGearmotorsAC & DC Drives-1- Basic Training Industrial-Duty & Commercial-DutyElectric MotorsGear ReducersGearmotorsAC & DC DrivesA Publication OfCopyright 1999Price $ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 Electric motor History and PrinciplesII. General motor Replacement Guidelines . . . . . . . . . . . .7III. Major motor Types . . . . . . . . . . . . . . . . . . . . . . . . . . . .10AC Single PhaseAC PolyphaseDirect Current (DC)GearmotorsBrakemotorsMotors For Precise motor ControlIV. Mechanical Considerations . . . . . . . . . . . . . . . . . . . . .16Enclosures and EnvironmentNEMA Frame/Shaft SizesNEMA Frame SuffixesFrame PrefixesMountingV. Electrical Characteristics and Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24 VoltagePhaseCurrent FrequencyHorsepowerSpeedsInsulation ClassService FactorCapacitorsEfficiencyThermal Protection (Overload)Individual Branch Circuit WiringReading a LEESON Model NumberMajor motor Components-2-VI.

CHAPTER I Electric Motor History and Principles The electric motor in its simplest terms is a converter of electrical energy to useful mechanical energy.

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