A lot more than 50% of the compression and pumping systems above 3 MW require a variable-speed drive. Frequently medium-voltage motors fed by frequency converters and parallel shaft gears are selected. Others are using epicyclic gears with a hydrodynamic superimposition drive.

Taking benefit of the condition of the art in electric motors and frequency converters, the driving program for the superimposition of the earth carrier is based on a Long lasting Magnet Synchronous Superimposition (SI) electric motor and an Active Front-End Cycle Converter. Therefore – E stands for Electric.
That is a high-speed gear drive system incorporating parts that allow the utilization of a low-cost Variator Gearbox constant-speed (electric) driver for a variable-speed application.

More than 50% of the compression and pumping systems over 3 MW need a variable-speed drive. Frequently medium-voltage motors fed by frequency converters and parallel shaft gears are chosen. Others are employing epicyclic gears with a hydrodynamic superimposition drive.
It started with hydraulic liquid couplings producing slippage with results very little much better than the throttle.
The design of hydraulic clutches then improved and included a torque converter and a superimposed epicyclic drive.
Variable Frequency Drives (VFD) were developed and, simultaneously, the cost of the shaft trains increased, therefore did efficiency. The problem of THD (Total Harmonic grid Distortion) rose and held VFD out of many applications.

Taking advantage of the condition of the artwork in electric powered motors and frequency converters, the driving program for the superimposition of the earth carrier is based on a Long lasting Magnet Synchronous Superimposition (SI) motor and an Active Front-End Cycle Converter. Therefore – E means Electric.
That is a high-speed gear drive system incorporating components that allow the usage of a low-cost constant-speed (electric) driver for a variable-speed application.

All of the over plots were taken by analyzing the existing to the motor. In a normal situation, the vibration will become monitored and kept on a periodic basis. If the 360 Hz signal is present in the vibration spectrum, it is not normally of any concern. If, however, additional unexplained frequencies come in the vibration spectra, after that it would be advisable to have a look at both the current waveform and the current spectrum. In the web pages that follow, some examples of problems found out in DC drives and motors are provided.”
It started with hydraulic fluid couplings creating slippage with results very little much better than the throttle.
The design of hydraulic clutches then improved and included a torque converter and a superimposed epicyclic drive.
Adjustable Frequency Drives (VFD) were developed and, at the same time, the cost of the shaft trains improved, therefore did efficiency. The problem of THD (Total Harmonic grid Distortion) rose and held VFD out of many applications.