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.

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“…The effectiveness of this method was verified via experiments using a 20 kW interior permanent magnet synchronous motor. In [8], a novel brushless synchronous machine topology that utilized stator sub-harmonic magnetomotive force (MMF) for desirable brushless operation was proposed. The sub-harmonic MMF component that was used in this topology was one-fourth of the fundamental MMF component, whereas, in previous practices, it was half.…”

A Novel Rotor Harmonic Winding Configuration for the Brushless Wound Rotor Synchronous Machine

“…An inverter configuration was designed in [24] to produce a supplementary third-harmonic element in conjunction with the primary current component to enable brushless operation in a wound field synchronous machine (WFSM). A technique involving the control of time-harmonic magneto-motive force for implementing harmonic current field excitation in a wound rotor synchronous machine (WRSM) was investigated in [25]. The investigated topology did not require varying current magnitudes, extra switches between the inverter and armature winding, complex inverter setups or structural changes to the machine.…”