A new brushless wound rotor synchronous machine using a special stator winding arrangement

Hybrid excited permanent magnet machines for electric and hybrid electric vehicles

“…To remove the slip rings and brushes, a brushless rotor WF HE machine is proposed in Fig. 6 [31]- [36]. The stator accommodates armature winding, whereas the rotor is located with field and harmonic windings.…”

“…In order to produce current in the rotor harmonic winding, various techniques have been proposed, e.g. single phase third harmonic current injection [33] [34], dual inverter to feed unequal amplitude of current [35], single inverter to feed the unequal turns of armature winding [36], as shown in Fig. 6 (c).…”

Optimal Design and Experimental Verification of Wound Rotor Synchronous Machine Using Subharmonic Excitation for Brushless Operation

“…The layout of the basic WRSM model designed for a brushless topology discussed in [19] is given in Figure 3. The stator has 48 slots with double-layer distributed winding.…”

Design and optimization of segmented PM consequent pole hybrid excited flux switching machine for EV/HEV application

“…However, since wound field are at rotor, brushes and slip rings are required which increases maintenance cost and reduces system reliability due to mechanical contact. The requirement of brushes and slip rings are eliminated in brushless HE topologies in [23]- [28] however machine topology and drive circuit become complicated. Moreover, spatial confliction of PM and DC coils limit torque density and flux regulation capability.…”