A Novel Three-Phase Tubular Switched Reluctance Linear Machine With Transverse-Flux Path

Several tubular switched reluctance linear machines (TSRLMs) with transverse flux are proposed for improving thrust density recently. Owing to the particularity of the structure of transverse-flux TSRLMs, how to maximize the electrical utilization becomes a key to improve these machines' performance. A novel three-phase transverse-flux TSRLM is proposed in this paper, whose stator sleeve is composed of six ferromagnetic rings and five spacer rings. And the mover is composed of an aluminum tube and several fan-shaped poles. The adjacent fan-shaped poles are placed at 120 degree intervals. In the novel structure, each half of the windings corresponding to a phase constitute a single coil without the need of intermediate connections. This winding way avoids the limitation of stator ferromagnetic ring spacing, and increases the space for wire placement compared with the other existing transverse-flux TSRLMs. In order to verify the superiority of the novel TSRLM, a conventional transverse-flux TSRLM which has the same volume and main dimensions is presented to compare their performances. Finally, the finite element calculation results show that the average thrust per unit core mass of proposed TSRLM is greater than conventional TSRLM, which shows its superiority for speed control systems. It proves that the novel structure can help increasing the use of TSRLMs.