Hypersynchronous SER Drive

Hypersynchronous SER (Slip Recovery Drives) in a control room.

The Slip Energy Recovery (SER) Drive is a technology that is well proven especially for large power motoring systems due to its capability to control very precise motor speed while recovering slip energy in the Wound Rotor Induction Motors (WRIM).

The Hypersynchronous SER Drive recovers excess energy that is supplied from the stator terminals (slip energy) and feeds this energy back into the grid. With the recovery of slip energy, the user will achieve very high efficiency ratios, thus reducing electricity consumption and reducing carbon emissions.

SER drives are very commonly used in onshore wind turbines due to its top-class efficiency, ultra high reliability and compact design.


Background of our Technology Partner

Our SER drives are manufactured by ElectroDrives, who is one of our trusted technology partners.

Electrodrives is based in Madrid-Getafe, Spain and is a global market leader in Slip Energy Recovery (SER) Drives for Slip Ring Motors that are mainly used in the mining industry especially for SAG Mills. Following the acquisition of International Electronics S.A. (IES) in 2018, ED is focused to further innovate and continue developing customer-focused solutions for the mining industry.

Technical Specifications : Hypersynchronous SER Drive


Typical Applications:

Motor Rated Power:

Typical Speed Ranges

(% of Synchronous Speed)

Typical Grid Voltages:

Motor Rotor Voltage:

Input Power Factor:


Starting Method:


Operating Temperature:

Cooling Method:

Switching Semiconductor:

Plant Communications:

Single Drive

Dual-pinion Drive (Master-slave with load sharing)

Constant Load (SAG Mills, Ball Mills, Vertical Mills)

1,000 kW up to 10,000 kW (per motor)

85% - 110% (Default for new grinding mills)

80% - 120% (Extended Range)

70% - 100% (In case the gearbox is not optimized)

3.3kV, 4.16kV, 6.0kV, 6.6kV, 11kV, 13.8kV

Up to 4,200V

0.99 with power factor control

>99.1% ( For motors of 5,000kW and above)

External LRS or RCS

Bump-less bidirectional transfer to LRS/RCS

+0 .. +50 deg C

Air-cooled (No water or other fluids)

IGCTs rated 4,500V

Ethernet/IP, Modbus-TCP, Profibus, Profinet, Ethercat, Devicenet


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