Investigation of Torque Characteristics in a Novel Permanent Magnet Flux Switching Machine With an Outer-Rotor Configuration

Abstract

This paper comprehensively investigates the torque characteristics of a novel permanent magnet flux switching machine with outerrotor configuration. Due to the nature of severe magnetic saturations in the machine, it is of particular interest to ascertain the extent of impact of the load conditions on the overall torque output as well as its component parts. The frozen permeability techniques are implemented in finite element analysis to segregate the output torque of the outer-rotor permanent magnet flux switching machine into three parts: cogging torque, reluctance torque and permanent magnet torque. Two dimensional finite element analysis is first employed to reveal the effects of phase current amplitudes and angles on those three torque components as well as the overall torque, while the three dimensional finite element analysis is carried out to further uncover the influences of end effects on the torque characteristics of the machine. Finally, experimental tests on a prototype machine are performed to validate the torque characteristic predictions by finite element analysis.Index Terms-Cogging torque, end effect, finite element analysis, frozen permeability, flux switching, magnetic saturation, outerrotor, permanent magnet torque, reluctance torque, torque ripple.

Modeling of Synchronous Reluctance Motors by Analytical and Finite Element Approaches for Electric Vehicle Applications

“…where ϕ M is the magnetic flux due linked to the armature winding, the i d and i q are respectively the dand q-axis; the L d and L q are the dand q-inductance. The voltage equations are written as [12]- [14].…”

“…T ripple(norm) = 1 + (T ripple − 0.05)9 0.17 (12) Based on the theorical background, the main/geometry prameters of the proposed motor are given in Table 2.…”

Optimized Design by Genetic Algorithm for Flux Switching Brushless Permanent Magnet Machines with Two Ports from Perspective of Losses

“…In recent years, the most attentions are toward the machines with double mechanical port [15], [16]. This machines can convey power in four quadratic besides that this topology have high power density and low spike torque so, it is great for hybrid electric vehicles and wind turbines [17], [18]. Fig3 is an automatic gear box in hybrid vehicle so that outer rotor is coupled with primarily gear and inner rotor is coupled with sun gear that in different speeds products different energies then this energy is stored in capacitor or batteries after passing from rectifier.…”