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VI. Metric (IEC) Designations . . . . . . . . . . . . . . . . . . . . . .34VII. Motor Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . .39Lubrication ProcedureRelubrication Interval ChartVIII. Common Motor Types andTypical Applications . . . . . . . . . . . . . . . . . . . . . . . . . . .41IX. Gear Reducers and Gearmotors . . . . . . . . . . . . . . . . .46Right-Angle Worm Gear ReducersParallel-Shaft Gear ReducersGearmotorsInstallation and Application ConsiderationsSpecial Environmental ConsiderationsGear Reducer MaintenanceX. Adjustable Speed Drives . . . . . . . . . . . . . . . . . . . . . . .55DC DrivesAC Drives“One Piece” Motor/Drive CombinationsAC Drive Application FactorsMotor Considerations With AC DrivesRoutine Maintenance of Electrical DrivesXI. Engineering Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65Temperature Conversion TableMechanical Characteristics TableElectrical Characteristics TableXII. Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .68-3-
CHAPTER IElectric Motor History and PrinciplesThe electric motor in its simplest terms is a converter of electrical energyto useful mechanical energy. The electric motor has played a leading rolein the high productivity of modern industry, and it is therefore directlyresponsible for the high standard of living being enjoyed throughout theindustrialized world.The beginnings of the electric motor are shrouded in mystery, but thismuch seems clear: The basic principles of electromagnetic induction werediscovered in the early 1800’s by Oersted, Gauss and Faraday, and thiscombination of Scandinavian, German and English thought gave us thefundamentals for the electric motor. In the late 1800’s the actual inventionof the alternating current motor was made by Nikola Tesla, a Serb who hadmigrated to the United States. One measure of Tesla’s genius is that he wasgranted more than 900 patents in the electrical field. Before Tesla’s time,direct current motors had been produced in small quantities, but it was hisdevelopment of the versatile and rugged alternating current motor thatopened a new age of automation and industrial productivity.An electric motor’s principle of operation is based on the fact that a current-carryingconductor, when placed in a magnetic field, will have a forceexerted on the conductor proportional to the current flowing in the conductorand to the strength of the magnetic field. In alternating currentmotors, the windings placed in the laminated stator core produce the magneticfield. The aluminum bars in the laminated rotor core are the currentcarryingconductors upon which the force acts. The resultant action is therotary motion of the rotor and shaft, which can then be coupled to variousdevices to be driven and produce the output.Many types of motors are produced today. Undoubtedly, the most commonare alternating current induction motors. The term “induction”derives from the transference of power from the stator to the rotor throughelectromagnetic induction. No slip rings or brushes are required since theload currents in the rotor conductors are induced by transformer action.The induction motor is, in effect, a transformer - with the stator windingbeing the primary winding and the rotor bars and end rings being the movablesecondary members.Both single-phase and polyphase AC motors are produced byLEESON and many other manufacturers. In polyphase motors, the place--4-
Page 1: BASIC TRAININGMOTORS, GEARS & DRIVE
Page 6 and 7: ment of the phase winding groups in
Page 8 and 9: CHAPTER IIGeneral Motor Replacement
Page 10 and 11: • Voltage.• Amperage (F.L.A.) -
Page 12 and 13: Capacitor Start motors are designed
Page 14 and 15: The following table can be used to
Page 16 and 17: Gearmotors may be either integral,
Page 18 and 19: Explosion Proof motors meet Under-w
Page 20 and 21: Motor Frame Dimensions(inches)NEMAF
Page 22 and 23: Types of MountsRigid base is bolted
Page 24 and 25: Belt TensioningManufacturers of bel
Page 26 and 27: Hertz / FrequencyIn North America 6
Page 28 and 29: For easy reference, standard NEMA s
Page 30 and 31: Three Phase Motors - 230 & 460 Volt
Page 32 and 33: Reading a LEESON Model NumberThere
Page 34 and 35: CHAPTER VIMetric (IEC) Designations
Page 36 and 37: IEC Enclosure Protection IndexesLik
Page 38 and 39: S8Continuous operation with periodi
Page 40 and 41: Relubrication Intervals ChartFor Mo
Page 42 and 43: Washdown-Duty * Single & Three Phas
Page 44 and 45: IEC Metric Motors * Three PhaseFor
Page 46 and 47: CHAPTER IXGear Reducers and Gearmot
Page 48 and 49: GearmotorsThree-phase NEMA C face A
Page 50 and 51: Reducers having hollow output shaft
Page 52 and 53: ating refers to the power a reducer
Page 54 and 55:
Gear Reducer MaintenanceIndustrial
Page 56 and 57:
There are two basic drive types rel
Page 58 and 59:
ined with feedback devices such as
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Torque: This is the most critical a
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Drive StatusSpeed SetpointRUN > 56.
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Constant-speed blower kitscan be ad
Page 66 and 67:
Mechanical CharacteristicsConvertin
Page 68 and 69:
CHAPTER XIIGlossaryActuator: A devi
Page 70 and 71:
Counter Electromotive Force: Voltag
Page 72 and 73:
Hertz: Frequency, in cycles per sec
Page 74 and 75:
Polyphase or three-phase motors are
Page 76 and 77:
Rectifier: A device or circuit for
Page 78 and 79:
Thermocouple: A pair of dissimilar
Page 80:
Go On-LineWith LEESON!Keep current
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