# How do you calculate the full load of a 3 phase motor?

## How do you calculate the full load of a 3 phase motor?

For three-phase, full load current for the resistive load is equal to the three-phase power divided by 1.732 times of voltage. Here power factor will be unity for resistive loads. Full load current I, I =P.

## How do you calculate motor load capacity?

When calculating motor loads, you need to know how to convert a motor’s current rating (given in amps) to a VA rating. To do this, multiply the motor’s nameplate amperage by the supply voltage.

How do you calculate load per phase?

Divide the load by the voltage x route 3 x power factor. So 60000/ ( 440 x 1.732 x 0.8) = 98 . 41A per phase.

How do you calculate 3 phase load current?

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.

### What is the formula of load calculation?

Calculating an Electrical Load in a Simple Circuit Let Power = Voltage * Current (P=VI). Let Current = Voltage/Resistance (I=V/R). Apply Kirchoff’s Second Law, that the sum of the voltages around a circuit is zero. Conclude that the load voltage around the simple circuit must be 9 volts.

### How do you select a motor according to load?

A constant or variable torque and horsepower will be required for the industrial motor depending on the type of load the motor is driving. The size of the load, the required speed, and acceleration/deceleration—particularly if it’s fast and/or frequent—will define the torque and horsepower that is required.

How do you calculate the mechanical load of a motor?

In our example input electrical power of the motor is 0.22 A x 6 V = 1.32 W, output mechanical power is 1000 rpm x 2 x 3.14 x 0.00126 N•m /60 = 0.132 W. Motor torque changes with the speed. At no load you have maximum speed and zero torque. Load adds mechanical resistance.

Why do you use the square root of 3 in power calculations?

The square root of three is also used in voltage drop calculations for balanced three-phase loads. It is the 120° separation between each of the three-phase voltages that is the driving force behind our use of the square root of three in electrical calculations for three-phase systems.

#### Why is the square root of 3 power?

The square root of 3 is the positive real number that, when multiplied by itself, gives the number 3. It is more precisely called the principal square root of 3, to distinguish it from the negative number with the same property. The square root of 3 is an irrational number.

#### How do you calculate kVA per phase?

3 phase amps to kVA calculation formula

1. S(kVA) = √3 × I(A) × VL-L(V) / 1000.
2. So kilovolt-amps are equal to √3 times amps times volts divided by 1000.
3. kilovolt-amps = √3 × amps × volts / 1000.
4. kVA = √3 × A ⋅ V / 1000.
5. S = √3 × 12A × 190V / 1000 = 3.949kVA.

How do you calculate per phase current in a 3 phase system?

Three Phase Current – Calculation

1. kW = kVA x pf.
2. kVA = kW/pf.
3. kVA = kW / power factor = 23/0.86 = 26.7 kVA (26700VA)
4. Current = VA / voltage = 26700 / 230 = 116 A.
5. VLL =√3 x VLN
6. VLN = VLL / √3.
7. kVA = kW / power factor = 12 / 0.86 = 13.9 kVA (13900 VA)
8. Current = VA / voltage = 13900 / 230 = 60 A.

What is the formula for 3 phase electric motor?

For three phase motor amps calculation, the below formula is used. 3 phase motor current calculation formula is P/ (√3xVxPfxEff) or P/ (1.732xVxPfxEff) Both are the same. So our motor power is 15KW with 15 x 1000 = 15000 Watts. Motor volts are 380 volts, Eff is 0.89 and PF is 0.85 according to the above nameplate.

## How to calculate 3 phase motor power consumption?

Calculate three-phase motor power consumption by multiplying amps by volts by the square root of three (W = AV (sqrt 3). For example, if the motor is drawing 30 amps at 250 volts, you have 30 x 250 x sqrt 3 (about 1.73) = 12,975 watts). Convert watts to kilowatts by dividing the number of watts by 1,000.

## What is the power formula for 3 phase system?

Perform a three-phase power calculation using the formula: P = √3 × pf × I × V ​ Where ​ pf ​ is the power factor, ​ I ​ is the current, ​ V ​ is the voltage and ​ P ​ is the power.

How do you calculate the energy consumption of a motor?

Calculate the power the motor consumes while in operation. The equation is W = AV(sqrt 3) where A is amperes, V is volts, and sqrt 3 is the square root of 33 (about 1.73). W is the power consumption in watts.