361 Table 8. Load Correction Factor (Ko) Type of Motor Peak Output/Basic Output 150% or Less Over 150%~200% or Less Over 250% AC Motor Single-Phase – – All Types Squirrel Cage Type 2 Phase – – All Types 4 Phase – 37Kw or More 30Kw or Less 6 Phase · 8 Phase – – All Types Wound Field Type 4 Phase – – 15Kw or Less 6 Phase – – 11Kw or Less 8 Phase – – 5.5Kw or Less Synchronous Motor – Standard Torque Type High Torque Type DC Motor Shunt Wound Field Series Hydraulic Motor – – All Types Office Machinery Printer · Fax Machine · Copy Machine – 1.2 1.4 Home Appliance Juicer – 1.4 1.6 Vacuum Cleaner 1 1.2 1.4 Finance Equipment Money Exchanger · Ticket Machine · Ticket Gates · Bank Teller Machine 1.3 1.4 1.5 Food · Medicine · Medical Equipment Bakery Equipment 1.2 1.4 1.6 Mixer · Granulator 1.4 1.6 1.8 Centrifuge 1.5 1.7 1.9 Medical Machinery · Measurement Equipment 1 1.2 1.4 Machine Tool Drill Press · Lathe 1.2 1.4 1.6 Milling Machine 1.3 1.5 1.7 Wood Lather 1.2 1.4 1.6 Printing Book Making Printer · Book Making Machine · Cutter 1.2 1.4 1.6 Textile Machine Textile · Knitting Machinery 1.3 1.5 1.7 Sawing Machine Sawing Machine – Home Use – 1.2 1.4 Sawing Machine – Industrial – 1.6 1.8 Belt Conveyor · Packaging Machine Belt Conveyor – Light Objects 1.1 1.3 1.5 Packaging Machine 1.2 1.4 1.6 Film · Wire Making Machine Calender · Extruder 1.4 1.6 1.8 Wire Making Machinery 1.4 1.6 1.8 Table 12. Special Motor Correction Factor (Kp) Motor Type Load Correction Factor Servo Motor Design as Kp=2.5 for Rated Output, and Kp=0.5 for Peak Output (Rational speed as applied speed) Spindle Motor Design as Kp=2.2 for Rated Output and Base Rotational Speed Table 9. Idler Correction Factor (Ki) Idler Position Inside Outside Loose Side of the Belt 0 +0.1 Tense Side of the Belt + 0.1 +0.2 Table 13. Load Correction Factor based on Frequency of Start/Stop (Ko) operation When the frequency of Start/Stop is less than 100 times per day Ko=1.5 When the frequency of Start/Stop is 100 times or more but less than 1,000 times per day Ko=2.0 When the frequency of Start/Stop is more than 1,000 times per day Ko=2.5 Table 10. Speed Multiplication Correction Factor (Kr) Speed Increase Ratio Correction Factor 1 or More Less than 1.25 0 1.25 or More Less than 1.75 + 0.1 1.75 or More Less than 2.5 + 0.2 2.5 or More Less than 3.5 + 0.3 3.5 or More + 0.4 Table 11. Operation Time Correction Factor (Kh) Operation Time Correction Factor Less than 10 hours (Everyday) 0 10~16 Hours Continuous (Everyday) +0.2 16~24 Hours Continuous (Everyday) +0.4 300 Hours/Year or Less (Seasonal operations etc.) –0.2 <For Servo Motor Applications> In the process of designing, apply Ko=2.5 for the rated torque and Ko=0.5 for the max. torque. * If the max. torque is generated each time the belt system is started up or stopped, choose an applicable load correction factor Ko from the Table 8., "Load Correction Factors based on Frequency of Start/Stop (Ko) operation," and apply it to the above expression. <For Spindle Motor Applications> In the process of designing, apply Ko=2.2 for the rated output and the basic rotation speed. [Step 2-c] For 2GT/3GT Series t%FTJHO 1PXFS 1E 5SBOTNJTTJPO 1PXFS 1U ¨0WFSMPBE $PFGGJDJFOU ,T ∙ Calculate the Transmission Power (Pt) from the motor rated power (Originally, it is ideal to calculate from the actual load applied to the belt) ∙ Normal Motor Load Factor (Ks)=Ko+Ki+Kr+Kh Ko : Load Correction Factor (Table 8) Ki : Idler Correction Factor (Table 9) Kr : Speed Increase Correction Factor (Table 10) Kh : Operation Time Correction Factor (Table 11) Timing Belt Selection ofTransmissionTiming Belts 2
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