A Novel Sub-Harmonic Synchronous Machine Using Three-Layer Winding Topology

Abstract

This paper proposes a novel brushless synchronous machine topology that utilizes stator sub-harmonic magnetomotive force (MMF) for desirable brushless operation. The sub-harmonic MMF component that is used in this novel topology is one fourth of the fundamental MMF component, whereas, in previous practices, it was half. To achieve the brushless operation, the novel machine uses a unique stator winding configuration of two sets of balanced 3-phase winding wound in 3 layers. For the rotor, additional winding is placed to induce the sub-harmonic component to achieve the brushless excitation. Unlike its predecessors, it utilizes maximum allowable space in the stator to house conductors in all of its slots. To implement the topology, 8-pole, 48-slot sub-harmonic brushless synchronous machine model has been designed. A 2-D finite element analysis (FEA) is used to simulate and validate the performance of the novel machine as a motor. The proposed topology shows better average torque than the existing sub-harmonic wound rotor brushless synchronous machine topologies.

A novel two-layer winding topology for sub-harmonic synchronous machines

“…Although the machine performance was improved to some extent, the machines in [11,12] are underutilized in terms of the slot space because of the stator winding arrangement. Moreover, in [13] a new sub-harmonic synchronous machine is proposed, where in the stator a novel three-layer winding was introduced. Out of the three windings, two layers are used for fundamental MMF production, and the third layer is utilized for sub-harmonic MMF production that is ultimately used for brushless operation of the synchronous machine.…”