An induction motor, starting “across the line”, will typically have an instantaneous draw 6x the kw it is rated to run at. e.g. a 10 hp motor is rated at 7.46 kw, so on starting it may draw 75 kw. On 480 volts 3 phase, the amperage will be I = W / (E x 1.73) = 75,000 / (480 x 1.73) = 90.4 amps.
How do you find the nominal current of a motor?
The motor FLA calculator uses the following formulas:
- Single Phase AC Motor FLA (Amperes) = (P [kW] × 1000) / (V × cos ϕ)
- Single Phase AC Motor FLA (Amperes) = (P [HP] × 746) / (V × cos ϕ × η)
- Three Phase AC Motor FLA (Amperes) = (P [kW] × 1000) / (V × 1.732 × cos ϕ)
What is the starting current of 1 hp motor?
For a 1 HP 3phase induction motor draws a current =W /V, so 1 HP is equal to 746 watts, or rounded off to 750 watts, so it will be 750 /415 volts =1.7 amperes, approximately and at a powerfactor at unity means 1.
How many amps is 3 horsepower?
AC Motor Full Load Amperes
|HP||200 Volts||440-480 Volts|
How do you calculate the maximum current of a motor?
I= P/(1.732*V*Cos pi)
Here three-phase full load current is equal to the power divided by 1.732 times of line to line voltage and power factor.
How many kW is a 5hp motor?
Hp to kW Conversion Table
|1 hp||0.745699872 kW||1 kW|
|5 hp||3.72849936 kW||4 kW|
|10 hp||7.45699872 kW||7 kW|
|15 hp||11.18549808 kW||11 kW|
How much current is needed for a 5hp motor?
Common Horsepower to Amps Conversions
|4 HP||27.6 A||120 V|
|4.5 HP||31.1 A||120 V|
|5 HP||34.5 A||120 V|
|10 HP||69.1 A||120 V|
How much current does a 1 hp motor consume?
When the 1 HP motor is running continuously for 24 hours, 17.904 units of Power will be consumed.