Best answer: How is 3 phase motor current measured?

In order to calculate three-phase wattage, the voltage of each phase is multiplied by the current of each phase, which is then multiplied by the power factor, and this value is multiplied by the square root of three (the square root of 3 is equal to 1.732).

How is motor phase current measured?

The motor current of a DC motor can be measured directly in the motor wire. It is required to use a “True RMS” multimeter to measure the motor current due to the chopped PWM motor voltage. A “simple” and commonly in use multimeter with AC or DC selection cannot(!!) measure the motor current properly.

How much current does a 3-phase motor draw?

Three Phase Motors

MOTOR RATING HP APPROX. F.L.C. AT LINE VOLTAGE
75 kW 100 239
90 kW 125 301
110 kW 150 350
130 kW 175 410

What is the 3 phase power formula?

3-Phase Calculations



For 3-phase systems, we use the following equation: kW = (V × I × PF × 1.732) ÷ 1,000. Again, assuming unity PF and solving this equation for “I,” you get: I = 1,000kW ÷ 1.732V.

How many volts is a 3 phase line?

3 phase system is expressed with line voltages. The line votage is 440 volt. Also the voltage between any one phase and neutral for a 3 phase system is 240 volts.

IT IS INTERESTING:  How much does it cost to get a transmission rebuild?

How do you calculate motor output?

A watt (W) is a unit of power defined as one Joule per second. For a DC source the calculation is simply the voltage times the current: W = V x A. However, determining the power in watts for an AC source must include the power factor (PF), so W = V x A x PF for AC systems.

How is electric motor load measured?

By taking the voltage and multiplying it by the associated current, the power can be determined. A watt (W) is a unit of power defined as one Joule per second. For a DC source the calculation is simply the voltage times the current: W = V x A.

How do you calculate the power of a motor?

Power = (Force x Distance) / Time



For electric motors, power or horsepower can be calculated from the torque and speed. For example, if you have a motor rated for 3,000 RPM and 6 in-lbf then the horsepower is calculated below.

How many amps is 3 horsepower?

AC Motor Full Load Amperes

HP 200 Volts 440-480 Volts
1 4.8 2.1
1.5 6.9 3.0
2 7.8 3.4
3 11 4.8

How many kW is a 5hp motor?

Hp to kW Conversion Table

Horsepower Kilowatts Rounded Kilowatts
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 many amps does a 1.5 HP 3 phase motor draw?

These are only intended to be guidelines and in all cases the full load amps of the motor nameplate should be used for final calculations.



Here are the Full Load Amp (FLA) values for typical 230VAC and 480VAC 3 phase motors.

IT IS INTERESTING:  Does too much oil damage engine?
Motor horsepower Full load amps 230VAC Full load amps 460VAC
1 3.3 1.7
1.5 4.7 2.4
Car repair school