motor with softstart
motor with softstart
(OP)
I got a motor 690 V 15 kw 50 hz, for moving a compressor with a load demand on 12,6 kw and 73 Nm, and speed 1750rpm and 60 hz, and my question is this motor suitable for this application, the idea is to start up with a soft start, and the load on compressor increase with speed... in 750 rpm it´´s about a 50 % of nominal load....my calculations says that with the new speed i got a torque on 85,6 Nm...and i think it´´ll be enough...how do you see? remember that after reaching nominal speed the soft start will be by passed....
thanks
thanks





RE: motor with softstart
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: motor with softstart
RE: motor with softstart
Your motor's full-load torque = 15kW X 9550/1750rpm = 81.85 Nm.
Your load torque requirement is 73 Nm @ 1750rpm (13.37kW at shaft, not 12.6 kW as you posted).
You have just enough motor power if your motor is 89% efficient. Most compressors do not load up immediately but follow what Bill said, you need to bring the motor up to speed before the loader valve kicks in.
RE: motor with softstart
We have both said it but one more time, get up to speed fast if you have an automatic unloader.
Bigger compressors are more forgiving.
Bill
--------------------
"Why not the best?"
Jimmy Carter