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 chosen. Others are employing epicyclic gears with a hydrodynamic superimposition drive.
Taking advantage of the condition of the art in electrical motors and frequency converters, the driving system for the superimposition of the earth carrier is based on a Long lasting Magnet Synchronous Superimposition (SI) engine and a dynamic Front-End Cycle Converter. Therefore – E means Electric.
This is a high-speed gear drive system incorporating parts that allow the utilization of a low-cost constant-speed (electric) driver for a variable-speed application.
More than 50% of the compression and pumping systems over 3 MW require a variable-speed drive. Often medium-voltage motors fed by frequency converters and parallel shaft gears are chosen. Others are using epicyclic gears with a hydrodynamic superimposition drive.
It started with hydraulic liquid Variable Speed Gearbox couplings making slippage with results very little much better than the throttle.
The look of hydraulic clutches then improved and included a torque converter and a superimposed epicyclic drive.
Adjustable Frequency Drives (VFD) were developed and, simultaneously, the price of the shaft trains increased, therefore did efficiency. The problem of THD (Total Harmonic grid Distortion) rose and held VFD out of several applications.
Taking advantage of the state of the art in electric motors and frequency converters, the driving system for the superimposition of the planet carrier is founded on a Long lasting Magnet Synchronous Superimposition (SI) motor and a dynamic Front-End Cycle Converter. Therefore – E stands for Electric.
That is a high-speed gear drive system incorporating parts that allow the use of a low-cost constant-speed (electric) driver for a variable-speed application.
All of the over plots were taken by analyzing the current to the motor. In a normal scenario, the vibration will end up being monitored and kept on a periodic basis. If the 360 Hz signal exists in the vibration spectrum, it isn’t normally of any concern. If, however, additional unexplained frequencies come in the vibration spectra, then it might be advisable to take a look at both current waveform and the current spectrum. In the web pages that follow, some examples of problems uncovered in DC drives and motors 
are shown.”
It started with hydraulic liquid couplings making slippage with results very little 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, simultaneously, the expense of the shaft trains improved, and so did efficiency. The problem of THD (Total Harmonic grid Distortion) rose and held VFD out of several applications.
