Hypersynchronous SER Drive

The Slip Energy Recovery Drive (SER Drive) is a technology well proven in the industry for large power motoring systems that allows precise motor speed control at the same time that recovers the slip energy in the Wound Rotor Induction Motors (WRIM). Due to its top-class efficiency, high reliability, and compact design, they are the most common technology chosen in onshore wind turbines (also called DFIG technology).

When looking to reduce the carbon emissions to the atmosphere for large induction motor applications with speed control, there is only one technology that provides the best efficiency among all possible choices: the Slip Energy Recovery System. The SER Drive is capable to recover the excess energy supplied from the stator terminals (slip energy) and feed this energy back into the grid. With this recovery of energy, the SER Drive is capable to reach incredible high efficiency ratios, reducing your electricity consumption saving dioxide carbon emissions.

Hypersynchronous SER Drives are chosen for four main advantages compared to other classical variable speed systems:

Redundancy. SER Drive is backed up with a starter (LRS or RCD) which allows to bump-less bidirectional transfer to the LRS/RCD in case of any failure preventing motor trips. This provides highest availability of your equipment and avoid unplanned trips in critical applications.

Top-class energy efficiency. The recovery of the slip energy from the rotor circuit through the SER Drive back to the grid, provides an unbeatable efficiency compared to any other technology.

Reliability and Robustness. Our SER Drive is designed with a large safety factor in voltage, current and temperature allowing to have the largest MTBF you can find in the industry. They are also air-cooled and very simple to maintain.

Hypersynchronous speed. SER Drives are capable to run motors beyond the rated speed without loss of torque compared to VSDs that require to reduce torque to maintain the torque/frequency ratio. This brings the possibility to increase the production without changing the motor.