# 3 Phase Motor Current Calculation Formula Explained

Today I am sharing with new simple and easy 3 phase motor current calculation formula for LT motors. In this post, I am sharing with you a nameplate of 3 phase low-voltage induction motor. In the nameplate, all data are given by the manufacturing companies.

## 3 Phase Motor Current Calculation Formula Explained

In the below image, I have shown a 3-phase motor nameplate. In the motor nameplate, the company provides the motor is 15 KW 3-phase induction motor. The Eff of the motor is 0.89 and PF is 0.85. The volts of the motor are 380V and the Amps are 30.1.

So this data is provided by the company. Now first see the image and after that, we start doing the current calculation of 3 phase motor. That is how completely calculate the current of three phase motor and how 30.1 amperes are given in the nameplate.

For 3-phase low voltage motor current calculation, we need the motor volts, Eff, PF. 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.
So if we calculate 15000/(1.732x380x0.85×0.89)
15000/(497.89) So 15000 / 497.89 = 30.12 Amps Or Load current of the motor.
By using this formula you can calculate the 3-phase low-voltage motor. This is a very simple and easy formula.

#### Message:

I hope this 3 phase motor current calculation formula (how to calculate 3-phase motor current) helps you. And now you will be able to calculate the load of 3 phase motor by using the above load current formula. Now if you have any questions or want to give us some suggestions about our blog then you can use the below comment section.

### 12 thoughts on “3 Phase Motor Current Calculation Formula Explained”

• April 3, 2018 at 8:44 pm

if possible write about formula or any calculation.
how to find suitable cable for load

• May 23, 2018 at 12:20 am

short circuit analysis

• September 15, 2018 at 3:00 am

give us some formulae equation on amps voltage ampere if u have more give us to me pls tks

• January 10, 2019 at 1:29 pm

Be attaching the Circuits with videos please for better understanding.

• March 25, 2019 at 9:39 pm

Thank you sir for your effort teaching us online

• May 16, 2019 at 1:19 pm

• June 9, 2019 at 10:23 pm

if p= power, pf=power factor, v=voltage, i=current, eff=?

• July 29, 2019 at 7:22 am

Pls, how can we reverse single phase motor