The rated current is generally calculated by the following formula:
Rated current=rated power/rated voltage (I=P/U)
The rated current of a three-phase motor refers to the line current of the lead-in wire of the motor power supply. For a star-connected motor, the line current is equal to the phase current, and for a delta-connected motor, the line current is equal to 3 times the phase current.
Therefore, the formula for calculating the rated current:
P-rated power of the motor;
U--Motor line voltage;
μ--The efficiency of the motor at full load;
cosφ---The power factor when the motor is fully loaded.
Single-phase motor rated current calculationThe rated current of a 220V single-phase motor is about 8 times the rated capacity. For example, the electric load of single-phase 220V motors in electric fans, hand drills, blowers, washing machines, and refrigerators is calculated as I=8P, where I---the rated current of single-phase asynchronous motors (A) P---motor Power (KW)
Both star connection and corner connection are P=1. 732*U* I* power factor
Line voltage = 1.732 phase voltage when star connection, line current = phase current
When angle connection, line voltage = phase voltage, line current = 1.732 phase current
Empirical formula 1:
380V voltage, 2A per kilowatt
660V voltage, 1.2A per kilowatt
3000V voltage, 4 kilowatts 1A
6000V voltage, 8 kilowatts 1A
Motor rated current calculation caseWhat is the rated power and rated current of a 15KW motor?
The rated power of a 15KW motor is 15KW. Symmetrical three-phase AC circuit power:
Solution: P = root number 3×U×I×cosφ, (the power factor cosφ is generally selected from 0.7 to 0.8)
Calculating current: I=P/root number 3×U×cosφ=15000/1.732×380×0.75≈30 (A)
Generally, the power of the motor multiplied by 2 is the approximate value of its current.
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