Analytical modelling and experimental verification of E‐type reluctance motors

Abstract

The main objective of this study is the analytical modelling of two short-flux-path two-phase reluctance motors with Etype stators: first, a switched reluctance motor and second, a hybrid-excitation reluctance motor (HRM). The former has no permanent magnets in its structure, whilst in the latter, there are magnets inside the common poles. Firstly, finite element analysis (FEA) is adopted to obtain the flux paths distribution in the proposed structures. Then, a precise magnetic circuit model (MCM), which considers all leakages and fringing effects, is built and the permeances of the machine are calculated for any rotor position based on the predicted flux flow patterns. Torque and inductance curves and steady-state current and voltage waveforms are also carried out. Finally, both motor prototypes are fabricated and the experimental results are obtained and compared with those of MCM and FEA. This comparative study confirms the validity and accuracy of the developed MCMs. In addition, the torque profiles of the proposed structures and two other conventional and C-type reluctance motors are compared. It is shown that the proposed HRM has superior characteristics amongst all compared structures. Nomenclature n number of stator E-cores θ sc stator common pole arc θ se stator excitation pole arc θ r rotor pole arc γ angle between two consecutive E-cores δ angle between two excitation poles in one E-core α rotor pole pitch N r number of rotor poles N f number of turns per excitation pole I f excitation current

Performance investigation of doubly salient outer rotor switched reluctance motor using finite element analysis

“…The pair of coil sides (A 1 , A 2 ) and (A 3 , A 4 ) are connected in series to achieve short flux path. This configuration results in a shorter flux path (Masoumi et al , 2018).…”

“…The pair of coil sides (A 1 , A 2 ) and (A 3 , A 4 ) are connected in series to achieve short flux path. This configuration results in a shorter flux path (Masoumi et al, 2018). Infolytica MagNet 7.5 is used to determine the characteristics of the configurations shown in Figure 3 Figure 5 shows the torque profile of the proposed configurations of DSORSRM motors based on FEA.…”

Torque analytical model of switched reluctance motor considering magnetic saturation

“…The magnetic equivalent circuit (MEC) method in [21–23] can be used to develop a simpler and application‐friendly modelling for the control of industrial SRMs, which takes into account the magnetic flux of air gap, poles and yokes of stator and rotor, and each part is expressed in magnetic permeance to analyse the electromagnetic characteristics of the motor. However, with the increase of stator winding current, the permeance varies due to the saturation of the ferromagnetic material.…”

Comprehensive study on divided‐teeth and permanent magnet assisted outer‐rotor switched reluctance motors

“…Applying PMs in the stator structure of SRMs is the second efficacious method for torque enhancement. In [13, 14], the authors have proposed a novel 12/16 E‐core SRM with embedded PMs inside the common poles of the stator. It can be found from the results that the proposed motor produces higher torque than the conventional 8/6 SRM.…”