Motor Application Formulas

Motor Application Formulas - EASA Electrical Engineering Handbook ...http://www.joliettech.com/formulas-motor_application.htm :: Home :: Our Blog :: RFQ :: Products :: Variable Frequency Drive :: DC Drives :: AC Drives :: Services :: Information :: Site Map :: Search Custom Search :: Quick Tour :: Contact Us :: About Us :: Home > EASA Engineering handbook > Motor Application Formulas Call Toll Free (866) 492-9888 Home ** Our Blog ** Products RFQ (Request for Quote) Recent Projects Services Contact Joliet Technologies Ask a Professional About Joliet Technologies Information Guide to Harmonics with AC Drives Reducing harmonics caused by variable speed drives FAQ (Frequently Asked Questions) EASA Engineering Handbook Motor Data - Electrical Terminal Markings and Connections Part Winding Start Three-Phase Motors - Single Speed Three-Phase Motors - Two Speed, Single Winding DC Motors DC Generators Field Polarities of DC Machines Maximum Locked-Rotor Currents Three-Phase Squirrel Cage Motors NEMA Code Letters for AC Motors General Speed-Torque Characteristics Effect of Voltage unbalance on Motor Performance Starting Characteristics of Squirrel Cage Induction Motors Allowable Starts and Starting Intervals Contractors NEMA Size Starters for Three-Phase Motors Starter Enclosures NEMA Size Starters for Single-Phase Motors Derating Factors for Conductors in a Conduit Temperature Classifications of Insulation Systems Resistance Temperature Detectors (RTD's) Determining the Polarization Index of Machine Windings Useful Formulas and Conversions Formulas for Electrical Motors Formulas for Electrical Circuits Temperature Correction of Winding Resistance Motor Application Formulas Glossary Visitor Survey - Help Us Help You Site Map Follow @JolietTech Useful Formulas Motor Application Formulas Output 0 Thursday, January 24, 2013 Torque (lb. ft.) x RPM Torque (N·m) x RPM Kilowatts = 5250 9550 Horsepower x 5250 Kilowatts x 9550 Torque (lb. ft.) = Torque (N·m) = RPM RPM Horsepower = Speed - AC Machinery Synchronous RPM = Percent Slip = 120 x Frequency (Hz) Number of Poles Synchronous RPM = Full-Load RPM Synchronous RPM x100 Time for Motor to Reach Operating Speed (in Seconds) Seconds = Wk = Inertia of Rotor + 2 Wk (lb. ft. ) x Speed Change (RPM) 308 x Avg. Accelerating Torque (lb. ft.) Inertia of Load x Load RPM 2 2 2 2 Motor RPM [(FLT + BDT)/2] + BDT + LRT Average Accelerating Torque = 3 BDT = Breakdown Torque Where: FLT = Full-Load Torque LRT = Locked-Rotor Torque back to table of contents Shaft Stress Shaft Stress (psi) = Shaft Stress (kg/mm ) = 2 HP x 321.000 RPM x D 3 6 KW x 4.96 x 10 3 RPM x D D = Shaft Diameter (in or mm) Where: HP = Motor Output KW = Motor Output psi = Pounds Per Square Inch RPM = Revolutions Per Minute Centrifugal Applications Affinity Laws Flow RPM 1 1 = Flow RPM 2 2 2 2 3 3 Fans and Blowers HP = CFM x PSF 33000 x Efficiency of Fan CFM x PIW 6343 x Efficiency of Fan CFM x PSI 229 x Efficiency of Fan CFM = Cubic Feet Per Minute PIW = Inches of Water Gauge PSF = Pound Per Square Foot PSI = Pounds Per Square Inch Pres Pres HP HP 1 2 = (RPM ) 1 (RPM ) 2 HP = 1 2 = (RPM ) 1 (RPM ) 2 HP = Where: Pres = Pressure RPM = Revolutions Per Minute Got a question or comment? 1 of 2 24/01/2013 12:27 PM L.875 x D x H 1 gallon (US) of water weighs 8. back to table of contents Volume of Liquid in a Tank Gallons = 5.joliettech. L.L. 2 of 2 24/01/2013 12:27 PM . Toll Free (866) 492-9888 1724 Tomich Court Crest Hill. Was this information helpful? YES NO Name and Email Address (optional). get our bi-weekly blog post sent to your inbox.0 2 Name: Email: Submit Where: D = Tank diameter (ft) H = Height of liquid (ft) Joliet Technologies..com © Copyright 2013 Site designed & maintained by Joliet Technologies.35 lb.C.C. IL 60403 Phone: (815) 725-9696 Fax: (815) 725-9393 E-mail: [email protected] x pounds per square inch gravity.. All rights reserved. Specific gravity of water = 1. Pumps GPM x FT x Specific Gravity HP = 3960 x Efficiency of Pump GPM x PSI x Specific HP = Gravity 1713 x Efficiency of Pump FT = Head in feet* Where: GPM = Gallons per minute PSI = Pounds per square inch *Head in feet = 2.com/formulas-motor_application. http://www.EASA Electrical Engineering Handbook .htm Need a Quote? Contact Joliet Technologies to get the answers.Motor Application Formulas .