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FORMULAE

 

DC Equations

 

Voltage = Current x Resistance (V=IR)

 

Power Real = Voltage x Current (P=VI)

 

 

Single Phase Equations

 

Power Apparent =        Power Real 2 + Power Reactive 2

 

 

Power Factor = Power Real / Power Apparent

 

 

Three Phase Equations

 

Power Apparent = Voltage x Current x 1.732

 

Power Real = Voltage x Current x Power Factor x 1.732

 

Horsepower = Power Real x Efficiency

                                   746

 

AC Speed Equations

 

AC Synchronous Speed = Frequency x 120

                                       Number of Poles

 

Percent Slip = Synchronous Speed – Full Load Speed x 100

                                    Synchronous Speed

 

Motor Application

 

Horsepower = Torque x Speed

                              5250

 

Acceleration Torque = Inertia x ΔSpeed

                                   308 x ΔTime

 

Units for equations on this page:

 

Voltage: Volts (V)

Current: Amperes (A)

Resistance: Ohms (Ω)

Frequency: Hertz (hz)

Rotational Speed: RPM

Power Real: Watts (W)

Power Apparent: VA

Power Reactive: VARS

Power Mech: Horsepower (hp)

Torque: Foot-pounds (lb-ft)

Inertia: (Foot-pounds)2 (lb-ft)2

Time: Seconds (s)

 

 

 

 

 

 

 

 

 

 

 

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This page last updated on 2012-04-11 02:00:42 AM