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Thermocouple: A pair of dissimilar conductors joined to produce a thermoelectriceffect and used to accurately determine temperature.Thermocouples are used in laboratory testing of motors to determine theinternal temperature of the motor winding.Thrust Load: Force imposed on a shaft parallel to a shaft’s axis. Thrustloads are often induced by the driven machine. Be sure the thrust load ratingof a gear reducer is sufficient so that its shafts and bearings can absorbthe load without premature failure.Torque: The turning effort or force applied to a shaft, usually expressedin inch-pounds or inch-ounces for fractional and sub-fractional HP motors.Starting Torque: Force produced by a motor as it begins to turn fromstandstill and accelerate (sometimes called locked rotor torque).Full-Load Torque: The force produced by a motor running at rated fullloadspeed at rated horsepower.Breakdown Torque: The maximum torque a motor will develop underincreasing load conditions without an abrupt drop in speed andpower. Sometimes called pull-out torque.Pull-Up Torque: The minimum torque delivered by a motor betweenzero and the rated RPM, equal to the maximum load a motor can accelerateto rated RPM.Transformer: Used to isolate line voltage from a circuit or to change voltageand current to lower or higher values. Constructed of primary and secondarywindings around a <strong>com</strong>mon magnetic core.Underwriters Laboratories (UL): Independent United States testingorganization that sets safety standards for motors and other electricalequipment.Vector Drive: An AC drive with enhanced processing capability that providespositioning accuracy and fast response to speed and torque changes.Often used with feedback devices in a closed-loop system.Voltage: A unit of electromotive force that, when applied to conductors,will produce current in the conductors.-78-
Watt: The amount of power required to maintain a current of 1 ampereat a pressure of one volt when the two are in phase with each other. Onehorsepower is equal to 746 watts.Winding: Typically refers to the process of wrapping coils of copper wirearound a core. In an AC induction motor, the primary winding is a statorconsisting of wire coils inserted into slots within steel laminations. Thesecondary winding of an AC induction motor is usually not a winding atall, but rather a cast rotor assembly. In a permanent magnet DC motor, thewinding is the rotating armature.-79-
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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
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• Voltage.• Amperage (F.L.A.) -
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Capacitor Start motors are designed
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The following table can be used to
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Gearmotors may be either integral,
Page 18 and 19:
Explosion Proof motors meet Under-w
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Motor Frame Dimensions(inches)NEMAF
Page 22 and 23:
Types of MountsRigid base is bolted
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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 80: Go On-LineWith LEESON!Keep current
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