Abstract
This paper presents the harmonic torque reduction by the different rotor pole angles of a three-phase 12/8 switched reluctance motor via an analytical model and simulation method. Improving torque performance by stator and rotor angles was applied for three-phase switched reluctance motor at stator pole/rotor pole ratios of 6/4, 8/12, 18/12, and 24/18. The average torque and the torque ripple effect by stator and rotor pole embrace have been recently studied in many projects. Due to the fact that leakage flux, flux density, and inductance are affected by the stator and rotor pole angles non-linear and linear leakage flux curves occur. Many stator and rotor pole angle combinations for the three-phase switched reluctance motor have already been done via a finite element method. In this paper, turn-on and turn-off angles will be figured based on stator and rotor pole embraces.
Highlights
Nowadays, the Switched Reluctance Motor (SRM) is considered as the most appropriate candidate to drive small scale electric vehicles due to advantages such as its simple construction, wide constant power regions, and effective torque speed characteristics
Some design parameters must be considered such as the number of phases, stator pole arc, air gap thickness, and other SRM geometry elements
In [6], the influence of pole embrace has been investigated on the performance of the SRM by the Finite Element Method (FEM) with stator and rotor pole embraces changing from 0.2 to 0.5
Summary
The rotor and stator pole arc angles are a critical part in the design of the SRMs. The rotor pole arc (βr) must be equal or greater than the stator pole arc (βs), because the number of rotor poles is less than the number of stator poles (βs ≤ βr). When the βs is smaller than the step angle, none of the phases can have rising inductance slope. The rotor pole angle should be greater than the sum of stator and rotor pole arcs [10]: ߚ ߚ௦; ߚ
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