August 2012

Special Report: Fluid Flow and Rotating Equipment

Consider new developments for variable-speed electric motors

New challenges, recent developments, the latest mechanical issues and main reliability factors for large variable-speed electric motor drivers in HPI plants are presented here.

Almasi, A., WorleyParsons Services

The major oil, gas and petrochemical operators use variable-speed electric motor drivers to drive process compressor trains, as shown in Fig. 1. A large electric synchronous motor is used for high-power applications. Because of the total shaft-line length of these large electric motors, dynamic issues and lateral vibrations are difficult problems. Resonance must be eliminated, and the lateral and dynamic exciting forces generated by the electric motor should also be minimized.   Fig. 1. Example of a large variable-speed electric motor. The number of motor poles in a high-power large electric motor driver is usually selected based on the rotational speed. When the speed

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