Current control strategy of Wound Rotor Synchronous Machine with losses consideration

摘要

Wound rotor synchronous machine (WRSM) could be a challenger to displace the interior permanent magnetic synchronous machine (IPMSM) due to plentiful merits of WRSM such as high starting toque at low speed range, good performance in flux weakening region, freedom field control via external circuit current without permanent magnet and power factor be controllable by field current. Inversely, there are also some drawbacks existing, which the exciting current should be injected via a slip ring so that external circuit makes the entire circuits more complex and shrink the life cycle. Also EMI and EMC occurred due to the outer circuit. In particular, field current are controllable, this study present a strategy that can be reasonable collocate the stator and field current for flux weakening control, so that the losses are able to reduced to maximize the efficiency. In addition, nonlinear variables are taken into account such as d-q axes inductances and phase flux linkage for accuracy. This algorithm is deemed to be Belt-driven Starter Generator (BSG) to serve for HEV e-Assisted application. A 6kw WRSM involve the current control strategy show the well performances such as the efficiency in the motoring mode and power regeneration as generator. The validity of the proposed algorithm has been verified by experimental results.