Motor Kalkış (DOL) Akımı Nasıl Hesaplanır?
Starting current in direct starting (DOL) ≈ (Il/In) × I_n and the locked rotor current is typically the rated current. It is 6–8 times greater.. For example, a motor with a rated current of 28 A draws ≈ 196 A in DOL (Direct-L); a star-delta configuration reduces this to approximately 1/3.
I_takeoff ≈ (Il/In) × I_n (DOL: typical 6–8 × I_n)
Example calculation: A motor with a rated current of 28 A, Il/In = 7 → DOL starting current ≈ 196 A; star-delta connection reduces this to ≈ 65 A.
Engine Starting Current (DOL)
Calculate the approximate starting current drawn by the motor during direct starting (DOL).
DOL starting current
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Notes: Starting current ≈ (Il/In) × I_n. In direct starting, the locked rotor current is typically the rated current. It is 6–8 times greater.; The exact current is found from the code letter on the motor label. Soft-starting methods reduce this current.
How is it calculated?
- Enter the full load current (I_n).
- Enter the takeoff flow ratio (Il/In) (from the code letter on the label).
- Press Calculate.
Frequently Asked Questions
How many times is the motor starting current?
In direct starting, the locked rotor current is typically 6–8 times the rated current.
How can starting current be reduced?
The star-delta (~1/3) is reduced with a softstarter or frequency inverter (VFD).
Why is starting current important?
High starting current can lead to voltage drop, protection tripping, and grid strain.
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