I have a 3 phase motor with half the nameplate missing
I have a 3 phase motor with half the nameplate missing
(OP)
I am missing the amps value on the nameplate for a 3 phase motor
Values still showing on nameplate;
50hz
kW - 4.4
PF - 0.81
EFF - 84
RPM - 1430
I am in the UK so 230v
Please can someone confirm if 7.87 amps is the correct value to input in the inverter
Thanks
Values still showing on nameplate;
50hz
kW - 4.4
PF - 0.81
EFF - 84
RPM - 1430
I am in the UK so 230v
Please can someone confirm if 7.87 amps is the correct value to input in the inverter
Thanks





RE: I have a 3 phase motor with half the nameplate missing
RE: I have a 3 phase motor with half the nameplate missing
If the rated voltage (line to line) is 400 V, 50 Hz then the full load Amp is usually 7-9 Amp ( for S1 duty cycle).
@ACWindings
RE: I have a 3 phase motor with half the nameplate missing
If the OP's intention is to run this 400V motor from a 230V supply using an inverter then the real question is whether this is a 230V Δ / 400V Y motor or a 400V Δ / 690V Y motor. The former can be configured to operate from a 230V supply without much difficulty, although 4.4kW inverters with single phase input aren't all that common. If it's the latter type then there are also options but not as straightforward.
If the motor is configured for operation on 400V and the OP posts a photo of the motor terminals and the position of the links then maybe we could make an educated guess as to which type it is.
RE: I have a 3 phase motor with half the nameplate missing
4400 Watts / (400 x root 3) = 6.35 Amps.
Real power = 6.35 Amps / .84 (efficiency) = 7.56 Amps
Apparent power = 7.56 Amps / .81 (PF) = 9.3 Amps
But it depends. This is based on assumptions.
The slip is a little higher than normal and the efficiency is a little lower than normal.
Bill
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