Dynamic analysis of a novel synchronous reluctance motor with a sinusoidal anisotropic rotor

Abstract: This paper deals with the dynamic analysis of a Novel Synchronous Reluctance Motor (NSynRM) having a sinusoidal rotor shape in the axial direction, without changing the flux-barriers design variables. Due to the non-self-starting characteristic of a Synchronous Reluctance Motor (SynRM), the motor is started by means of an industrial drive of ACS880 type. The motor is a 4-pole, 5.5 kW with a base speed of 1500 rpm. The practical tests are performed at three different speeds in order to analyze the dynamic responses when there is a sudden change in mechanical load characteristics. The measured results of the NSynRM are compared with those of a Standard Synchronous Reluctance Motor (SSynRM)

Real-time model of synchronous reluctance motor drive for laboratory based investigations

The Synchronous Reluctance Motor has received much attention in recent years as a very promising solution for electric drives in the near future. This paper presents a real-time model of the motor to be implemented into a software environment used for DSP control system development including debugging. The model is used in laboratory based investigations in academia in order to analyse the performance of electric drives based on a synchronous reluctance motor

A reduced-order position observer with stator-resistance adaptation for synchronous reluctance motor drives

A reduced-order position observer with stator-resistance adaptation is applied for motion-sensorless synchronous reluctance motor drives. A general analytical solution for the stabilizing observer gain and stability conditions for the stator-resistance adaptation are given. The local stability of the position and stator-resistance estimation is guaranteed at every operating point except the zero frequency, if inductances are known accurately. The observer design is experimentally tested using a 6.7-kW synchronous reluctance motor drive; stable operation at low speeds under various loading conditions is demonstrated.Peer reviewe

A comparison of an adaptive full-order observer and a reduced-order observer for synchronous reluctance motor drives

Two back-EMF-based position observers are compared for motion-sensorless synchronous reluctance motor drives. The reduced-order observer is of the second order, and the adaptive full-order observer is of the fourth order. The proposed design rules guarantee the stability of the adaptive full-order observer, if the parameter estimates are accurate. The observers are experimentally evaluated using a 6.7-kW synchronous reluctance motor drive in low-speed operation and under parameter errors. The gain selection of the second-order observer is easier, but the adaptive full-order observer is more robust against parameter variations and spatial harmonics.Peer reviewe

Analysis and design of a position observer with resistance adaptation for synchronous reluctance motor drives

A back-EMF-based reduced-order position observer with stator-resistance adaptation is analyzed for motion-sensorless synchronous reluctance motor drives. Analytical equations for steady-state estimation errors and stability conditions are derived (with and without resistance adaptation), taking into account errors in the parameter estimates. The effect of the observer gain on the noise reduction is studied by means of eigenvector analysis. A robust gain selection is proposed, which maximizes the allowed uncertainties in the parameter estimates. The proposed observer design is experimentally evaluated using a 6.7-kW synchronous reluctance motor drive; stable operation is demonstrated at low speeds under various parameter errors.Peer reviewe

Fast synthesis of permanent magnet assisted synchronous reluctance motors

open3This paper describes a procedure for a practical synthesis of both a synchronous reluctance motor and a permanent magnet assisted synchronous reluctance motor. The procedure is completely analytical, yielding a rapid drawing of the motor geometry, taking into account both magnetic and mechanical considerations. From the application requirements, the external volume of the motor is computed. The further practical needs, such as maximum outer space, maximum available length, existing stator lamination, and so on are considered. Then, the design of the rotor geometry is carried out. The PM size is determined considering the demagnetisation limit according to the maximum current loading.openBianchi, Nicola; Mahmoud, Hanafy; Bolognani, SilverioBianchi, Nicola; Mahmoud, Hanafy; Bolognani, Silveri

Energy-based modeling of electric motors

We propose a new approach to model electrical machines based on energy considerations and construction symmetries of the motor. We detail the approach on the Permanent-Magnet Synchronous Motor and show that it can be extended to Synchronous Reluctance Motor and Induction Motor. Thanks to this approach we recover the usual models without any tedious computation. We also consider effects due to non-sinusoidal windings or saturation and provide experimental data

Position-sensorless control of permanent-magnet-assisted synchronous reluctance motor

The sensorless control of permanent-magnet-assisted synchronous reluctance (PMASR) motors is investigated, in order to conjugate the advantages of the sensorless control with full exploitation of the allowed operating area, for a given inverter. An additional pulsating flux is injected in the d-axis direction at low and zero speed, while it is dropped out, at large speed, to save voltage and additional loss. A flux-observer-based control scheme is used, which includes an accurate knowledge of the motor magnetic behavior. This leads, in general, to good robustness against load variations, by counteracting the magnetic cross saturation effect. Moreover, it allows an easy and effective correspondence between the wanted torque and flux and the set values of the chosen control variables, that is d-axis flux and q-axis current. Experimental verification of the proposed method is given, both steady-state and dynamic performance are outlined. A prototype PMASR motor will be used to this aim, as part of a purposely assembled prototype drive, for light traction application (electric scooter

Hybrid photovoltaic-thermoelectric generator powered synchronous reluctance motor for pumping applications

The interest in photovoltaic (PV) pumping systems has increased, particularly in rural areas where there is no grid supply available. However, both the performance and the cost of the whole system are still an obstacle for a wide spread of this technology. In this article, a hybrid photovoltaic (PV)-thermoelectric generator (TEG) is investigated for pumping applications. The electric drivetrain comprises a synchronous reluctance motor and an inverter. A control strategy for the drivetrain is employed to execute two main tasks: 1) driving the motor properly to achieve a maximum torque per Ampere condition and 2) maximizing the output power of the PV system at different weather conditions. This means that the conventional DC-DC converter is not used in the proposed system. Moreover, batteries, which are characterized by short life expectancy and high replacement cost, are also not used. It is found that the motor output power and the pump flow rate are increased by about 9.5% and 12% respectively when the hybrid PV-TEG array is used compared to only using PV array. Accordingly, the performance, cost and complexity of the system are improved. Measurements on an experimental laboratory setup are constructed to validate the theoretical results of this work

Design of synchronous reluctance motor

Diplomová práce se zabývá analýzou konkretního synchronního reluktančního motoru s vyniklými póly a návrhem synchronního reluktančního motoru s bariérami magnetického toku. Práce je rozdělena do pěti částí. V první částí je popsán princip funkce synchronního reluktančního motoru a uveden stručný přehled realizovaných řešení. V druhé kapitole jsou analytickým výpočtem zjištěny základní parametry synchronního reluktančního motoru s vyniklými póly. V třetí části práce jsou ověřeny výsledky analytického výpočtu pomocí programu FEMM v lineárním a nelineárním stavu a pomocí transientní analýzy motoru v programu Ansys Maxwell. V další části jsou uvedeny výsledky měření parametrů synchronního reluktančního motoru s vyniklými póly a porovnání s vypočítanými hodnotami a výsledky simulací. Závěrečná kapitola se zabývá návrhem motoru s bariérami magnetického toku. Dosažené parametry jsou ověřeny v programu FEMM a Ansys Maxwell. Finální varianta navrženého motoru je analyzovaná při napájení ze sítě a z frekvenčního měniče pomocí cosimulace Maxwell-Simplorer.Master thesis deals with analysis of the definite synchronous reluctance motor with salient poles and design of synchronous reluctance motor with barriers for magnetic flux. The work is divided into five parts. In the first part there is a brief overview of realized synchronous reluctance motor designs and also operating principle of motor of this type is described. The next part contains the basic parameters of the synchronous reluctance motor with salient poles; the parameters were found with analytical calculation. The third part demonstrates verified by means of FEMM results of analytical calculations for linear and nonlinear states and with transient analysis of motor using Ansys Maxwell environment. In the following part results of testing of the synchronous reluctance motor with salient poles are presented as well as the comparation of these results with calculated values and the results of simulations. The closing part of the thesis shows the design of synchronous reluctance motor with barriers for magnetic flux. All obtained parameters were examined using FEMM and Ansys Maxwell. The final version of the proposed motor was analysed when supplied directly by mains and through the converter by Maxwell- Simplorer co-simulation.