Noise reduction in switched reluctance motor by modifying the structures

Abstract

The magnetic effects and consequently the radial force are the main causes of noise in switched reluctance motors (SRMs). In this study a new design for SRM is developed in order to reduce acoustic noise. In this research a new design for SRM is developed in order to reduce the acoustic noise. In this investigation, at first, different SRM structures are simulated using JMAG software. An 8/6-pole SRM is designed and built with special modification in the rotor and stator structures. For increasing mechanical strength, trapezoidal stator and rotor pole shape with poles arc β r = β s = 21° are proposed. In this design the taper angles of stator and rotor poles are equal. For noise reduction, the mechanical restructuring is done according to stress analysis. The new designed SRM are simulated and tested experimentally under no-load and full-load conditions. The results are shown and compared. Comparison between these results and the results of other structures shows that the acoustic noise of the newly designed motor is reduced considerably. The results show an acoustic noise reduction of ∼72% in new structure SRM.

Reduction of inappropriate principal features of the switched reluctance motor using sinusoidal rotor configuration

“…Figure 9(a),(b) display the steady-state torque and RF profiles in both motors. The reduction in the maximum and average values of torque in the proposed motor is evident, as previously discussed in Equations ( 1) and (10). In the SRSRM, TR is reduced by 47.78%, while AT diminishes by 31.27%, which is a trade-off.…”

“…Based on Equation (10) and the relationship between ψ and β it can be deduced that as β increases, TR in the SRSRM is likely to decrease, especially in part P1 due to the effect of precession in the advanced position. However, depending on the desired deviation in the SRSRM through β this process may lead to a reverse effect because of the backwardness of Part 2.…”

“…Meanwhile, remarkable reductions in RF have been achieved in ref. [10] by employing structures, such as hexagonal stators, tapered pole angles, and apertures, albeit with a modest reduction in TR. Modifications in the rotor, particularly due to its lack of winding, offer opportunities for reform.…”

FEA-based Geometrical Modification of Switched Reluctance Motor for Radial Force Reduction

“…( 18) and ( 19), the natural frequencies and modal mode shapes can be found in Eq. ( 19) [17][18][19][20][21][22] . The deformation was reduced when the windows were inserted into the rotor core.…”

Geometry and Topology Optimization of Switched Reluctance Machines: A Review

“…The geometrical design parameters of SRMs can be optimized to minimize the amplitude of the most dominant harmonics that contribute to the acoustic noise [77]. The natural frequency of the different circumferential mode shapes of the machine structure can be controlled by the mechanical design and the used materials as illustrated in [72], which can be used to mitigate the acoustic noise as illustrated in [78]. The drive control variables such as the phase firing angle, the turn-off-angle, the reference current, and the current profile were used in the literature to eliminate or reduce the amplitude of selective spatial harmonic orders to minimize the acoustic noise as discussed in [79]- [82].…”