No-Load Current Calculator
Enter the values of full-load current, FLC(A) and load factor, R to determine the value of no-load current, In-L(A).
No-Load Current Formula:
No-load current is the electrical current that flows through an electric motor when it is running without any mechanical load attached to its shaft.
This current is necessary to overcome internal losses within the motor, including friction and core losses. Although no mechanical work is being done, the motor still draws current to maintain its magnetic field and to power the internal components.
Monitoring no-load current is important for assessing the health of a motor and ensuring efficient operation.
Excessive no-load current can indicate issues such as bearing problems, winding short circuits, or improper motor alignment. No load current is the minimum current that flows when the device is powered but not engaged in actual work.
In transformers and induction motors, the no load current primarily consists of magnetizing current needed to sustain the magnetic field in the iron core.
The no-load current, In-L(A) in amperes is equal to the full-load current, FLC(A) in amperes multiplied by the load factor, R divided by 100.
No-load current, In-L(A) = FLC(A) * R / 100
In-L(A) = no-load current in amperes, A.
FLC(A) = full-load current in amperes, A.
R = load factor in percentage.
No-Load Current Calculation:
- Calculate the no-load current for a motor with a full-load current of 10 amperes and a load factor of 5:
Given: FLC(A) = 10A, R = 5.
No-load current, In-L(A) = FLC(A) * R / 100
In-L(A) = 10 * 5 / 100
In-L(A) = 0.5A.
- Determine the full-load current, if the no-load current is 0.8 amperes and the load factor is 4:
Given: In-L(A) = 0.8A, R = 4.
No-load current, In-L(A) = FLC(A) * R / 100
FLC(A) = In-L(A) * 100 / R
FLC(A) = 0.8 * 100 / 4
FLC(A) = 20A.