Final Report Summary - MAGIM (Magnetically Geared Induction Machines)
- The torque transmitted to the low speed rotor (the load) is not limited by the magnets since the high-speed dc windings act as a “boost” for providing extra power
- The magnet volume is reduced which results in a more economical drive solution.
This topology is also interesting for power energy generation, especially for wind turbine systems which uses a doubly fed induction generator and a mechanical planetary gear. Indeed, it offers a better reliability (suppression of the mechanical gear) and an enhanced operating flexibility. Another potential application of the system concerns hybrid/electrical vehicles. Indeed, MaGIM could easily be used as induction machine/magnetic gear based power split device as to constitute a continuously variable transmission. Furthermore, the demonstrated torque boost capabilities of MaGIM are of great interest to overcome the problems due to mechanical overloads (severe torque transients) in hybrid/electric vehicles.
As an application example, a MaGIM rated at 100 kW, #=115-120 rpm, 8000Nm is considered for the simulation studies. A continuous torque density transmission in excess of 80 Nm/L is obtained. To show the impact of the boost winding on the performances of MaGIM, if you compare the transmitted pull-out torque for different values of the number of turns/slot of the boost winding, Ndc: compared to the situation where the boost is disconnected (Ndc=0), a torque increase of about 15% is obtained when Ndc=10.