To Find: |
Direct
Current |
Single Phase |
Three Phase |
Horse Power |
E x I x EFF
746 |
E x I x EFF x PE
746 |
1.732 x E x I x EFF x PF
746 |
Current |
746 x HP
E x EFF |
746 x HP
E x EFF x PF |
746 x HP
1.732 x E x EFF x PF |
Efficiency |
746 x HP
E x I |
746 x HP
E x I x PF |
746 x HP
1.732 x E x I x PF |
Power Factor |
--------- |
Input Watts
E x I |
Input Watts
1.732 x E x I |
E = Volts HP = Horsepower PF = Power Factor (decimal)
EFF = Efficiency (decimal) I = Amperes
Formulas for Electrical Circuits:
To Find: |
Direct Current |
Single Phase |
Three Phase |
Amperes |
Watts
Volts |
Watts
Volts x Power Factor |
Watts
1.732 x Volts x Power Factor |
Volt-Amperes |
-------------------- |
Volts x Amperes |
1.732 x Volts x Amperes |
Watts |
Volts x Amperes |
Volts x Amperes
x Power Factor |
1.732 x Volts x Amperes
x Power Factor |
OHMS Law |
Capacitance in Microfarads at 60 HZ. |
Ohms = Volts/Amps (R=E/I)
Amps = Volts/Ohms (I=E/R)
Volts = Amps x Ohms (E+IR) |
Capacitance = 2650 x Amperes
Volts
Capacitance = 2.65 x KVAR
(Volts) squared |
V - BELT DESIGN FORMULAS
BELT SIZE: 2C + 1.57 (D+d) + (D-d) ˛ ÷ 4C
C=center distance D= O/D of large sheave d = O/D of small sheave
SHEAVE CIRCUMFERENCE: Diameter X Pi = Circumference Pi = 3.1415BELT LENGTH, when center distance known: D+d X Pi divided by 2+2 X C/D = belt length
SPEED DELIVERED TO DRIVEN SHEAVE: Dr ÷ dN X RPM (of Dr) = speed delivered to dN
BELT SPEED: V (belt speed) = d x n ÷ 3.82 d=small sheave dia.inches, n = RPM of “d” sheave
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