We get the 3-phase current formula like this: To figure out how many amps does a motor with certain kW power have, we have to rearrange this equation a bit.
Now for the 3-phase motor current calculation formula: 3-Phase Current FormulaĪs we have seen, this 3-phase power formula calculates how many kW of electric power will a motor have given its current: Insert these 3 quantities in the calculator, and you should get the same result. You can use this example to see how the 3-phase power calculator works: A 100 amps motor on a 240V 3-phase circuit with a 0.9 power factor produces 37.41 kW of electrical power. Quite similarly, a higher power factor is proportional to higher power output. You need to input the amps, voltage, and the power factor (it’s between 0 and 1, specific for each circuit):Īs you can see, the more amps and volts you have, the more powerful 3-phase electric motor you have. You can freely use this calculator to convert amps to kW in a 3-phase circuit. 3-Phase Power Calculator: Amps To kW (1st Calculator) That one converts kW to amps in 3-phase circuits, very important in electric motor design. Note: Later on, we will also see how we can use the 3-phase current formula to design a 3-phase motor amps calculator. We can use this equation to design the 1st calculator: 3-phase power calculator (check below). It converts watts into kilowatts because we usually prefer to deal with kW instead of W.īecause we need to use the power factor to calculate the kW from amps, this formula is also known as the ‘3-phase power factor formula’. 1,000 factor: This is another constant.To be exact, we get a square root of 3 (√3). It comes from the derivation of this equation. 1.732 factor: This is a constant in the 3-phase power calculation.The higher the PF, the more kW a 3-phase circuit has. This accounts for the real/apparent power ratio and is sometimes expressed as RMS current. In the 3-phase circuit, current and voltage are not in phase thus the power factor will be anywhere between 0 and 1.
If current and voltage are in phase, the power factor is 1. Power factor is defined as a ratio between real power and apparent power.
PF: Power factor, it’s a number between -1 and 1 (0 and 1 in practice). The more volts we have, the more power we have in a three-phase circuit. V (Volts): Electrical potential, measured in volts. The more amps we have, the more power we have in a three-phase circuit. I (Amps): Electrical current, measured in amps. P (kW) = ( I (Amps) × V (Volts) × PF × 1.732) ÷ 1,000Īs we can see, the electrical power in the 3-phase AC circuit depends on: 1 kW = 1,000W.Ĭompared to this, the 3-phase power formula is a bit more complex. The ‘1,000’ factor is there to convert from W to kW we want the resulting power to be in kilowatts. Here’s the simple formula we use to calculate power on a 1-phase AC circuit:īasically, we just multiply amp by volts. To see why we get different amperage on a 3-phase circuit, let’s first check how these amps are calculated using the 3-phase power formula: 3-Phase Power Formula On a 3-phase circuit (with a 0.6 power factor), the 3-phase power calculator shows that the same 6 kW appliance draws 48.11 amps. H ow many amps in 3-phase power? At 1.0 power factor, the amps in 3-phase power in this situation is 28.87 amps. On a 3-phase circuit (with a 1.0 power factor), the 3-phase power calculator shows that the same 6 kW appliance draws 28.87 amps. On a 1-phase circuit, 6 kW draws 50 amps. To get an idea of how these calculators work, here is the screenshot of the 3-phase power calculator: Example of how 1st calculator works: A 3-phase motor that draws 90A and runs on a 240V circuit with a 0.8 power factor will produce 29.93 kW of electrical power.īefore we cover the basics, let’s do a quick example to illustrate how calculating power on a 1-phase vs 3-phase circuit works.Įxample: Let’s say we have a 6 kW air conditioner on a 120V circuit. You can jump to 3-phase amps to kW formula and calculator here. We apply the classic 3-phase motor current calculation formula. Second 3-phase power calculator converts amps to kW in much the same way. You can jump to 3-phase kW to amps calculator here. For this, we use the 3-phase power formula with the 1.732 factor and power factor (we’ll cover the formula as well). First 3-phase power calculator converts kW to amps. To simplify the whole thing, we have created 2 three-phase power calculators: In a 3-phase AC circuit (usually a 3-phase motor), converting amps to kW and kW to amps is not all that easy. That requires only the basic Ohm’s law you can simply use our kW to amps calculator here for conversion. It’s quite easy to convert kW to amps and amps to kW in a simple 1-phase AC circuit (compared to a 3-phase power calculation).
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