Selection criteria and application of a 16000 HP, 4-pole induction motor for a compressor drive

Historically, many users have established a somewhat arbitrary line in the range of 5000 HP to 10000 HP as the point to switch from an induction motor to a synchronous motor design. This paper covers the selection process of a 16000 HP, 4-pole, induction motor driving a centrifugal compressor. Starting considerations, oscillating torque, power mechanical and electrical design issues, first cost, and life-cycle costs are taken into account. Discussion points include the perspective of the user, air separation OEM and motor manufacturer. We see a growing trend toward ever-larger horsepower induction motor applications. The intent of this paper is to provide criteria to be examined during motor specification.