Screw Compressor

We are working to design electrical system to screw compressor that work with a 288 kW electrical motor. We are looking for a torque versus speed curves of load, the screw compressor is a Gea Grasso type SP1 RB-1B. We are try to use a softstar to drive the main motor but need more technical information to fix the correct device. Please if anyone have those information help me. e-mail [email protected].

only technical information that i have is:

Manufacturer: Schorch
Number of poles: 2
Degree of protection: IP23
Voltage: 460 V ± 5%
Drive motor rating: 288 kW
Rated current: 435 A
Speed: 3.550 rpm
Frequency: 60 Hz