Abstract
This paper proposes a new scheme for a brushless wound rotor synchronous machine (WRSM) by generating an additional, two-pole component of magneto-motive force (MMF) with a series-connected additional three-phase winding with the armature three-phase winding. Unlike existing brushless excitation schemes, which use the inverter to inject harmonic currents in the stator windings, the proposed scheme uses series-connected additional winding on the stator with the armature winding in a two-pole configuration. Consequently, as the current flows in the armature winding, it creates a fundamental rotating air gap flux to interact with the field flux. At the same time, additional rotating flux is created from the additional three-phase winding, which cannot synchronize with the field winding. This additional flux can cause the induction of a voltage in a winding with exactly the same number of poles. For this purpose, a harmonic winding is installed in the rotor along with the field winding connected through a diode bridge rectifier, in order to feed the direct current (DC) to the field winding for rotor excitation without an input current from the brush-slip-ring assembly. The 2D finite-element analysis (FEA) was performed to validate the brushless operation of the proposed machine system.
Highlights
Research on brushless wound rotor synchronous machines (WRSMs) has gained significant interest in the past decade [1]
This paper proposes a cost-effective brushless three-phase wound rotor synchronous machine
A simplified structure and topology are initially analyzed for the brushless operation of the WRSM
Summary
Research on brushless wound rotor synchronous machines (WRSMs) has gained significant interest in the past decade [1]. In [6,7,8,9,10], more compact machine systems have been investigated by generating and utilizing harmonic flux to induce a voltage in harmonic winding on the rotor with a conventional stator structure. These types of machines are compact in size as they remove the need to install the exciter field winding on the stator. Recent research has focused on removing the harmonic winding from the rotor and inducing the harmonic alternating current (AC) power in the field winding on the rotor [11,12]. The two stator windings have a different number of poles, in order for one winding to create a four-pole rotating flux synchronized with the field winding and the second winding to create a rotating two-pole flux intercepted by harmonic winding on the rotor to induce a voltage
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