Flux Compensated Magnetic Amplifier Motor Starter

We would like to use a reduced voltage starter for a centrifugal chiller motor, which is induction type, 3-phase, 11 kV, 60 Hz, 1850 HP. We received an offer to provide a “Flux Compensated Magnetic Amplifier” Soft Starter.

According to the available data, the starter consists of a coil connected in series with the motor winding so that as the motor speed increases, the impedance of the coil decrease providing smooth, stepless starting of the motor, then a bypass contactor closes to connect the full voltage to the motor.

This is the first time to know about this product. Does anybody have information/experience/recommendation about such a product?

Dual Voltage Motor

I am designing a new project which contains medium voltage chiller motors.
The power supply voltage at the beginning of the project will be 3 phase 11 kV, 60 Hz. But in future, within couple of years the voltage will be changed to 13.8kV, 60 Hz. The transformers will be dual voltage (11-13.8 kV). But I am not sure about the availability of dual voltage motors. Could anybody advise me in this regard?.