The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
It is well-known that in multiphase drives the spatial harmonics of the air-gap magnetic field can be controlled independently of each other. In this paper it is shown how the third-order spatial harmonic of the magnetic field can be used to estimate the rotor speed without the need of a mechanical sensor. Experimental results confirm the feasibility of the developed sensorless speed observer.
The paper presents a complete solution for speed sensorless control system for five-phase induction motor with voltage inverter, LC filter and nonlinear control of combined fundamental and third harmonic flux distribution. The control principle, also known as multiscalar control, nonlinear control or natural variables control, is based on a use of properly selected scalar variables in control feedback...
Selection of drive's rated power influences not only vehicle's dynamics, but also its energy efficiency. Mentioned above approach requires a multiphysical model, which covers both mechanical and electrical phenomena. This paper discusses how selection of traction drive's rated power influences vehicle energy consumption on example of a trolleybus. A complex mathematical model was developed in Matlab/Simulink...
This paper introduces an innovative sensorless model predictive current control (MPCC) technique for an induction motor (IM) drive. The proposed technique handles the state of the inverter as a discrete control variable in contrast to the classic vector control in which the discrete model of the inverter is not considered. An effective formulation of cost function is used, in which there is no need...
In this paper the induction motor state estimator based on current MRAS-type concept with a modified speed adaptation algorithm is presented. Its stability in motoring and regenerating modes is analysed. The influence of motor parameter mismatch to the stability boundaries is presented. It is shown that one of the proposed modification methods of the adaptation algorithm makes the estimator stable...
This paper proposes a method for direct torque control of Brushless DC (BLDC) motors. Evaluating the trapezium of back-EMF is needed, and is done via a sliding mode observer employing just one measurement of stator current. The effect of the proposed estimation algorithm is reducing the impact of switching noise and consequently eliminating the required filter. Furthermore, to overcome the uncertainties...
Induction motors are the most commonly used prime-movers in industrial applications. Many induction motors supplied by frequency converters are coupled with a physical angular rotor position/velocity sensor which makes the drive complex and require maintenance. This paper presents a sensorless control structure to avoid using a physical angular rotor position/velocity sensor. The proposed method estimates...
This paper analyzes the resonance phenomenon that occurs in the uncontrolled slave motor of two surface mounted permanent magnet synchronous motor (SPMSM) drives, connected in parallel to a single inverter. This phenomenon is observed when the inverter is controlled by the master-slave method, due to the differences in parameters between the two motors and load, during medium and low speed operation...
This paper presents a field-circuit coupled design and analysis method for the permanent magnet synchronous motor (PMSM) system used in electric vehicles. The time-stepping finite-element method is used to simulate the motor system, which integrates the electromagnetic field analysis of the motor prototype and the control algorithm of the drive system. A two-dimensional transient electromagnetic field...
Modular Cascade Machines (MCM) system is operated as the driving system in Electric Vehicles (EVs). It is comprised by unit motors like series batteries, which can expand the high efficiency region effectively and can be regarded as a redundant system with excellent fault tolerance ability. In this paper, a fast efficiency evaluation method is proposed for a PMSM. Through the proposed method, it is...
Recently, electric vehicle is paying attention because of its eco-friendly characteristics. Interior permanent magnet synchronous motor(IPMSM) is the most popular type of electric motor because of its compactness and high efficiency. But recently, rising costs of permanent magnet and demagnetization issues which result from high current density make interests in induction motor for vehicle traction...
A method for the time-step analysis of single-phase induction motors is proposed. The unknown variables in the differential equations are the currents flowing through the rotor bars. They are coupled with the distributed magnetic flux densities in the air gap instead of the inductance matrix while applying Kirchhofes and Faraday's induction laws. Two patterns for magnetic flux densities are necessary...
In order to study the theory and characteristics of the mechanical drive system fault in the current signal of the wind turbine generator better, the fault simulation experimental platform of double fed wind generator drive gear is used as the research object, and the simulation model of double motor torque and rotational speed coupling is established by a motor and a doubly fed wind generator according...
This paper deals with sensorless vector control of induction motor (IM) based on model reference adaptive system (MRAS) theory and sliding mode technique. An adaptive-gain supertwisting (ASTW) sliding mode speed controller is designed to provide good speed tracking performance in the presence of load torque variation. A stator current and rotor flux sliding mode observer (SMO) is designed, which is...
This paper proposes a highly improvised and a vibrant sensorless vector control of the three-phase induction motor drive, brought out by a combination of sliding mode control and Space vector pulse width modulated inverter, with “Direct synthesis from State Equations” (DSS) as the technique for estimating speed. Field oriented Vector control method of decoupling the flux and torque and controlling...
This article reviews the process analysis made in the electric drive with a field regulated reluctance machine. The calculation of the critical torque to the frequency of the reference signal for the assessment of adjustment possibilities at high speeds is performed. The urgency of the task of the mathematical models synthesis for the electrotechnical system on the basis of the AC electric drive with...
This article presents the new results of the investigation of the characteristics of vector-controlled induction motor (IM) drives with the torque maximization at field weakening. Analytical expressions that are necessary for the optimal algorithm of field weakening have been derived. The systematic numerical studies of the dependence of relative torque increase (RTI) index on the stator current limit...
When using induction motors for hybrid electric vehicle (HEV) applications, variable wide speed control system is always required to drive the induction motor up to 10,000rpm or more. Distorted voltage from the control system causes harmonic currents, which generate additional losses and reduce output torque and efficiency. This paper investigates the current harmonic influence in the induction motor...
This paper investigates the impact of downsizing induction motors for battery-electrical-vehicles (BEV). With three electrical torque equations based on stator current, stator voltage and stator flux density, we display the overload potential of an induction motor. The traditional efficiency map of an induction motor is extended by a so-called overload-area. An algorithm for sizing an induction motor...
This study presents the direct torque controlled induction motor (IM) drive utilizing a novel extended Kalman filter (EKF) that simultaneously estimates stator stationary axis components of stator currents and stator fluxes in addition to rotor and stator resistances with the assumption of available stator voltages/currents and rotor speed. Thus, it is desired to show that the on-line estimations...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.