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.

ment of the phase winding groups in conjunction with the phase sequence of the power supply line produces a rotating field around the rotor surface.

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