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• Voltage.• Amperage (F.L.A.) - full load motor current.• Maximum ambient temperature in centigrade - usually +40°C (104°F).• Duty - most motors are rated continuous. Some applications, however,may use motors designed for intermittent, special, 15, 30 or 60minute duty.• NEMA electrical design - B, C and D are most <strong>com</strong>mon. Design letterrepresents the torque characteristics of the motor.• Insulation class - standard insulation classes are B, F, and H. NEMA hasestablished safe maximum operating temperatures for motors. Thismaximum temperature is the sum of the maximum ambient and maximumrise at maximum ambient.• Code - indicates locked rotor kVA per horsepower.• Service factor - a measure of continuous overload capacity.-9-
CHAPTER IIIMajor Motor TypesAlternating current (AC) induction motors are divided into two electricalcategories based on their power source – single phase and polyphase(three phase).AC Single Phase TypesTypes of single-phase motors are distinguished mostly by the way they arestarted and the torque they develop.Shaded Pole motors have low starting torque, low cost, low efficiency,and no capacitors. There is no start switch. These motors are used on smalldirect drive fans and blowers found in homes. Shaded pole motors shouldnot be used to replace other types of single-phase motors.PSC (Permanent Split Capacitor) motorshave applications similar to shaded pole,except much higher efficiency, lower current(50% - 60% less), and higher horsepower capability.PSC motors have a run capacitor in thecircuit at all times. They can be used to replaceshaded pole motors for more efficient operationand can be used for fan-on-shaft fan applications,but not for belted fans due to the lowstarting torque.PSC circuit diagramSplit Phase motors have moderate to lowstarting torque (100% - 125% of full load), highstarting current, no capacitor, and a startingswitch to drop out the start winding when themotor reaches approximately 75% of its operatingspeed. They are used on easy-to-start beltdrive fans and blowers, as well as light-startpump applications.-10-
Page 1: BASIC TRAININGMOTORS, GEARS & DRIVE
Page 4 and 5: VI. Metric (IEC) Designations . . .
Page 6 and 7: ment of the phase winding groups in
Page 8 and 9: CHAPTER IIGeneral Motor Replacement
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
Page 60 and 61:
Torque: This is the most critical a
Page 62 and 63:
Drive StatusSpeed SetpointRUN > 56.
Page 64 and 65:
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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