The EVT can also be used in other applications, some of which will be studied in the project EMTECHNO (*). The EVT can be used as electromagnetic retarder, storing the kinetic or potential energy in the battery. There is a high power DC-bus for external power take off inherently present allowing for easy exchange of electrical power. Since there is no mechanical connection between the ICE and the wheels, the EVT provides an inherent overload protection, and can also actively damp vibrations. Except for the slip rings, the system is maintenance free. ![]() There is no need for lubrication, sealing or valves. The EVT is expected to have a higher efficiency. The EVT combines several functionalities into a single device, making the system compact. Using an EVT results in additional advantages over other hybrid drive trains. When the battery is omitted, the EVT can work as a “simple” continuously variable transmission (CVT). A drive train with EVT is thus a hybrid drive train. The power to the wheels is split in a part coming from the ICE, while the remaining part is exchanged with a battery. The main functionality of the EVT is to work as power split transmission. Electrically both the stator and the inner rotor are connected to a common dc-bus using two power electronic converters (PEC’s). In that case mechanically one of the shafts is connected to the internal combustion engine (ICE), the second shaft to the final drive of the vehicle. Permanent magnet type EVT - exploded view Typical applicationĪ typical application is in the drive train of a vehicle. Today, very few such devices exist, but one has been developed in the past by Electrical Variable Transmission BV and has recently been adopted in a unique test setup at Ghent University. The stator finally is a conventional electric motor stator. ![]() The outer rotor can be a squirrel – cage rotor, or can contain permanent magnets depending on the type used. The inner rotor contains three phase windings and slip rings to transfer electric current to these windings. Topologically it can be seen as an electric machine with two concentric rotors. A test set-up including such an EVT has been created and the added value for different applications was studied in the Flanders Make SBO project EMTECHNO.Īn electrical variable transmission or EVT is a fully electromagnetic continuously variable transmission which provides two additional electrical ports for hybrid functionality. Can you imagine the range of applications for a transmission without gliding or sliding contact surfaces, a transmission which is moreover continuously variable in an electrical manner? UGent has been studying such an Electrical Variable Transmission (EVT) system in much detail for some time now.
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