In this paper, direct-drive transverse flux-type motors (TFMs) with large pole numbers have been proposed for electric ship propulsion. The propulsion motors are required for low-speed drive. In speed-feedback control at low-speed region, however, it is difficult to obtain enough speed information from encoder due to its low resolution. Consequently, the stability of the system tends to get remarkably worse. For that reason, Dual Sampling rate Observer (DSO) is applied to the control system to resolve such problem in feedback control. The validity of the proposed system is verified through the comparison of experimental results with/without DSO.
展开▼
