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The no-load and armature reaction magnetic field distributions of a single-sided axial-flux permanent-magnet synchronous generator (AFPMSG) without armature core are determined by analytical solution of the field equations, using a Fourier series approach. The method is computationally efficient and enables the harmonics and field form of the AFPMSG to be evaluated quickly. A finite element analysis...
The paper proposes a technique to analyze the double star PM synchronous generators by transforming the two 3-phase winding sets into two couples of windings on the d and q axes of the rotor reference frame. The technique introduces improvements with respect to other approaches, as it takes into account the harmonic content of the no-load flux linkages of the armature windings, it applies to a generic...
In this paper the performance of air-cored stator axial flux permanent magnet machines with different type of concentrated (non-overlapping) coil windings is evaluated. The evaluation is based on theoretical analysis and is confirmed by finite element analysis and measurements. It is shown that concentrated-coil winding machines can have similar performance as normal overlapping winding machines using...
A new magnetic circuit model is presented for an interior permanent magnet (IPM) synchronous machine, using a machine with three-phase distributed stator windings and three layers of flux barriers in the rotor as an example topology. The model accounts for: i) the effects of cross-coupled magnetic saturation caused by the salient rotor; ii) variation of magnetic saturation levels in the iron rotor...
In this paper, a simple non-linear magnetic analysis- based optimum design of axial-flux permanent magnet (AFPM) machines is presented, which realizes the maximization of torque density while keeping motor volume. The proposed analysis consists of the geometric-flux-tube-based equivalent-magnetic-circuit model. The model includes saturable permeances taking into account the local magnetic saturation...
This paper describes a design approach dedicated to multiphase surface mounted permanent magnet SMPM machines. Based on a vectorial multimachine modelling that splits the multiphase machine in a set of magnetically independent fictitious machines, this approach allows to determine a pertinent control topology in case of pulse width modulation (PWM) voltage source inverter (VSI) supply. Design rules...
This paper presents a new and novel method which is designed to detect the rotor position at standstill and also low speeds in switched reluctance motor. In this method a small capacitor is connected in series with the motor winding for sampling the voltage rise during the detection period. The supply voltage in conjunction with the drive transistor produces short pulses for this series connection...
This paper presents estimate the rotor position and speed of switched reluctance motor (SRM) based on hybrid observer (HO). This algorithm has been simulated with MATLAB/SIMULINK for nonlinear model of SRM and has been compared with current sliding mode observer (CSMO) and flux linkage sliding mode observer (FSMO). Simulation results show that proposed observer will estimate the rotor position and...
This paper presents a design study of an in-wheel switched reluctance motor for electric vehicles. Rotating part of the motor is fitted into the wheel rim and the stationary part is directly connected to the wheel axle. Such a construction not only leads to reduce the total weight and volume, but also increases the total efficiency of the vehicle propulsion system, eliminating the mechanical transmission...
The paper presents the design and analysis of a longitudinal flux linear switched reluctance motor (LSRM) for high precision position control applications. The inductance and force profiles of the LSRM are investigated using an analytical magnetic circuit analysis method and finite element method (FEM). Using FEM, the design of a LSRM is optimized for a semiconductor equipment application with high...
This paper presents enhancements of a predictive direct torque control for synchronous reluctance machines down to zero speed. The proposed control scheme is used when high- performance torque control is desired with the advantages of constant switching frequency and relative long sampling time. To get that, the control algorithm calculates one step in advance the switching instants of two possible...
This study investigates the dynamic characteristics of Synchronous Reluctance Motor (SynRM), with segmental rotor structure, using finite element method in which the moving mesh technique is considered. The focus of this paper is the effective of on-line parameter identification system for position sensorless control of a SynRM under saturation and iron loss. Comparisons are given with angle of the...
High performance sensorless AC drives require the exact knowledge of the motor phase voltages in the whole speed range. The use of voltage sensors may be eschewed if the reference voltage signals, generated by the control algorithm, can be used instead. To this aim, an accurate compensation of most of inverter non-idealities is stringent. This paper presents a novel technique for the cancellation...
In this paper we introduce a novel control method of a three-phase PWM inverter with output LC filter. The transfer function of LC filter is the same as that of second order LPF(low pass filter) except that it has zero damping ratio. A simple method to implement second order LPF with damping ratio is adding resistor in series with reactor. But the series resistor cannot be used in real high power...
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