GENERAL CHARACTERISTICS AND NAMEPLATE INFORMATION in .NET framework

Print DataMatrix in .NET framework GENERAL CHARACTERISTICS AND NAMEPLATE INFORMATION

GENERAL CHARACTERISTICS AND NAMEPLATE INFORMATION
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Fractional-horsepower motors may be single-phase or polyphase These motors differ in starting torque, starting current, service factor, purpose (general or special), duty, reversibility, price, and other factors These factors must be considered in choosing the right motor for a particular job and in maintaining and troubleshooting motors Tables 6-1 and 6-2 list some important characteristics of fractional-horsepower alternating current (AC) motors
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TABLE 6-1 Typical Characteristics of AC Motors Motor Types Starting torque (% full load torque) Starting current service factor (% of rated load) Comparative price estimate (based on 100% per lowest cost motor) Remarks Split-Phase General-Purpose 130% Normal 135% 110% Split-Phase Special Service 175% High 100% 100% Capacitor-Start Special Service 250% Normal 100% 135% Start General-Purpose 350% Normal 135% 150% Polyphase 1 hp & Below 275% Normal 135% 150%
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Low starting torque High service factor permits continuous loading up to 35% over nameplate rating Ideal for applications of medium starting duty
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Moderate starting torque, but has service factor of 10 Apply where load will not exceed nameplate rating for any extended duration of time Because of higher starting current, use where starting is infrequent
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High starting torque but 10 service factor Use only where load will not exceed nameplate rating for any extended duration of time Starting current is normal
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Very high starting Normal start current for poly torque High phase is comservice factor pared to singlepermits phase motors continuous High factor perloading up to mits continuous 35% over loading up to nameplate 35% over namerating Ideal for plate rating Direct powering companion to devices with general purpose heavy loads, capacitor-start such as motor conveyors
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Source: Courtesy of General Electric
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TABLE 6-2 Motor Characteristics
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Typical Reversibility Rest/Rot Rest only Rest only Rest/Rot** Rest/Rot** Rest/Rot** Rest/Rot** Uni-directional Uni-directional Rest/Rot Rest/Rot Rest/Rot Rest/Rot Rest/Rot Rest/Rot Rest/Rot Speed Character Relatively constant Relatively constant Relatively constant Varying Relatively constant Constant Constant Constant Varying Adjustable Adjustable Adjustable Adjustable Adjustable Adjustable Adjustable Typical Start Torque * 175% & up 125 200% 175% & up 175% & up 75 150% 125 200% 125 200% 75 150% 175% & up 175% & up 125 200% 175% & up 175% & up 175% & up 75 150%
Duty Polyphase Split phase synchronous Split phase nonsynchronous PSC nonsynchronous high slip PSC nonsynchronous norm slip PSC reluctance synchronous PSC hysteresis synchronous Shaded pole Series Permanent magnet Shunt Compound Shell arm Printed circuit Brushless DC stepper AC AC AC AC AC AC AC AC AC/DC DC DC DC DC DC DC DC Continuous Continuous Continuous Continuous Continuous Continuous Continuous Continuous Int/Cont Continuous Continuous Continuous Continuous Continuous Continuous Continuous
Source: Courtesy of Bondine Electric * Percentages are relative to full-load rated torque Categorizations are general and apply to small motors ** Reversible while rotating under favorable conditions: generally when inertia of the driven load is not excessive Usually unidirectional can be manufactured bi-directional Can be adjusted but varies with load Reversible down to 0 C after passing through rest Dependent upon load inertia and electronic driving circuitry
CHAPTER SIX
NAMEPLATE READINGS
Each motor has a nameplate on which the manufacturer provides information to aid in motor selection, operation, maintenance, and troubleshooting Although each manufacturer arranges the information in a different way, all provide the same data: the horsepower of the motor, the power required to operate the motor, and the frequency of that power It also includes its voltage and current; the frame, serial number, and model number of the motor, the capacitor to be used (if needed); and the temperature required for normal operation OPERATING ACCORDING TO NAMEPLATE DIRECTIONS
Do not operate motors at other than 10% of the nameplate voltage Do not operate motors on nominal power source frequencies other than that indicated on the nameplate Do not overload the motor in excess of nameplate current rating Do not exceed the temperature of the nameplate insulation class Do not change the value of capacitance indiscriminately Do not subject the motor to duty cycles for which it was not designed
Motor performance is adversely affected if it is operated under conditions that deviate from nameplate speci cations Table 6-3 lists some performance parameters adversely affected
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