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CHAPTER XIIGlossaryActuator: A device that creates mechanical motion by converting variousforms of energy to rotating or linear mechanical energy.Adjustable Speed Drive: A mechanical, fluid or electrical device thatvariably changes an input speed to an output speed matching operatingrequirements.AGMA (American Gear Manufacturers Association): Standardssetting organization composed of gear products manufacturers and users.AGMA standards help bring uniformity to the design and application ofgear products.Air-Over (AO): Motors for fan or blower service that are cooled by theair stream from the fan or blower.Alternating Current (AC):electric utilities.The standard power supply available fromAmbient Temperature: The temperature of the air which, when cominginto contact with the heated parts of a motor, carries off its heat. Ambienttemperature is commonly known as room temperature.Ampere (Amp): The standard unit of electric current. The current producedby a pressure of one volt in a circuit having a resistance of one ohm.Armature:• The rotating part of a brush-type direct current motor.• In an induction motor, the squirrel cage rotor.Axial Movement: Often called “endplay.” The endwise movement ofmotor or gear shafts. Usually expressed in thousandths of an inch.Back Driving: Driving the output shaft of a gear reducer – using it toincrease speed rather than reduce speed. Worm gear reducers are not suitablefor service as speed increasers.Backlash: Rotational movement of a gear reducer’s output shaft clockwiseand counter clockwise, while holding the input shaft stationary.Usually expressed in thousandths of an inch and measure at a specificradius at the output shaft.-68-
Bearings:Sleeve: Common in home-appliance motors.Ball: Used when high shaft load capacity is required. Ball bearingsare usually used in industrial and agricultural motors.Roller: Use on output shafts of heavy-duty gear reducers and onsome high-horsepower motors for maximum overhung andthrust load capacities.Breakdown Torque: The maximum torque a motor can achieve withrated voltage applied at rated frequency, without a sudden drop in speedor stalling.Brush: Current-conducting material in a DC motor, usually graphite, or acombination of graphite and other materials. The brush rides on the commutatorof a motor and forms an electrical connection between the armatureand the power source.Canadian Standards Association (CSA): The agency that sets safetystandards for motors and other electrical equipment used in Canada.Capacitance: As the measure of electrical storage potential of a capacitor,the unit of capacitance is the farad, but typical values are expressed inmicrofarads.Capacitor: A device that stores electrical energy. Used on single-phasemotors, a capacitor can provide a starting “boost” or allow lower currentduring operation.Center Distance: A basic measurement or size reference for worm gearreducers, measured from the centerline of the worm to the centerline ofthe worm wheel.Centrifugal Starting Switch: A mechanism that disconnects the startingcircuit of a motor when the rotor reaches approximately 75% of operatingspeed.Cogging: Non-uniform or erratic rotation of a direct current motor. It usuallyoccurs at low speeds and may be a function of the adjustable speedcontrol or of the motor design.Commutator: The part of a DC motor armature that causes the electricalcurrent to be switched to various armature windings. Properly sequencedswitching creates the motor torque. The commutator also provides themeans to transmit electrical current to the moving armature through brushesthat ride on the commutator.-69-
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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
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 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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