The maximum permissible current that may be sustained by the motor insulation is referred to as the Full Load Current. Because the current being fed into the machine is higher than the current being drawn by the machine when it is fully loaded, the electrical device may be damaged.
Because of the high current flow, the machine generates more heat (Because of heat/loss = I2 R).
This may result in damage to the electrical motor’s insulation or winding if it continues. As a result, extending the life of an electrical motor requires that the machine be used at less than its maximum load current.
Motor rated current, also referred to as full load amperes (FLA), is the maximal current that a motor’s windings are rated to transfer. Here is a simple calculator for motor rated current.
How to use the calculator for motor rated current?
For calculation, the above utility requires the following data:
- Type of Motor: One-phase or three-phase
- Motor power rating in kW
- Efficiency as shown on the nameplate
- Rated power factor
To determine the necessary
- Fuse rating,
- Circuit breaker rating,
- Contactor current rating, and
- Overload setting,
input the necessary data and obtain the current value.
How is motor current for a three-phase and single-phase motor calculated?
Calculation of 3-phase motor amps with a kilowatt (kW) power rating
I = 1000 x KW / (√3 X VL-L X cosØ x ή%)
Calculation of 1-phase motor amps with a kilowatt (kW) power rating
I = 1000 x KW / ( VL-N X cosØ x ή%)
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