Classical Direct Torque Control performance of Line Start PM Synchronous Motor for different conditions

This paper deals with a direct torque control for nine switches inverter fed two induction motors-based electric vehicles (EVs). In EVs application, the developed system will decrease the installation cost and weight (power electronic devices, position sensors, and mechanical differential). In this context, an adaptive direct torque control of nine switches Inverter which feeds two induction motors is proposed in order to ensure a separate control of two driving wheels and stability for the vehicle when cornering or under slippery road conditions. The experimental tests using dSPACE 1104 card are carried-out to demonstrate the feasibility and effectiveness of the proposed control solution, in terms of robustness and stability.electric vehicle, induction motor, direct torque control, nine switches inverter, dSPACE 1104 | INTRODUCTIONRecently, the strong growth of the transport sector is inevitable in order to satisfy the ever-increasing needs of rapid move or travel. With the growing problems of global warming, pollution, and the depletion of fossil resources, internal combustion engines are no longer suitable for transportation systems and new directions are needed. 1 For these reasons, several research works have been pushed by industry to develop electric-vehicles. This research aims at optimize the cost and energy of the electric powertrain. 1,2 In this context, an electric powertrain is generally composed of one or more electric motors, a power converter, and a measuring chain and instrumentation. In the electric vehicle motorization, induction motors are widely used due to their convenience in terms of robustness, compactness, reliability, and cost. 3 In order to ensure more maneuverability and good driving force distribution, the two driving wheel structure of electric vehicle turns out to be the most suitable. In addition, this structure offers the possibility to eliminate the LIST OF SYMBOLS AND ABBREVIATIONS: DTC, direct torque control; EV, electric vehicle; IGBT, isolated gate bipolar transistor; IFOC, indirect field oriented control; ref, reference quantity; L A,B,C , inverter power legs; S A , B,C , inverter power switches; S L,M,U , lower, medium, and upper power switches; s, stator index; r, rotor index; u, i, voltage, current; U DC , direct voltage; U s , stator voltage vector; ψ s , ψ 0 s , stator flux of both induction motors; Γ e , Γ 0 e , torque of both induction motors; d Γ , d Γ 0 , torque errors of both motors; d ψ , d ψ 0 , flux errors of both motors; α, β, synchronous reference frame index; a, b, c, three phases reference frame index; S (1,…6) , sector number; T s , sampling time; ω m , induction motor speed; ω r , rotor electric speed; R s , stator resistance; L m , inductance (magnetizing inductance); L r , rotor inductance; L s , stator inductance; p, pole-pair number.

Section: Independent Control Of Nine Switches Inverter‐fed Two Induct...mentioning

confidence: 99%

Direct torque control scheme for nine switches inverter fed two induction motors‐based more electric vehicle powertrains

Abbache

Tabbache

Douida

et al. 2021

“…In order to initialize the rotor rotation during the start‐up, a damper winding setup is required . Self‐start permanent magnet synchronous motor (SSPMSM) have been thought of a suitable solution for constant speed applications . However, SSPMSM has drawbacks such as high cost of the magnet and demagnetization effect.…”

Section: Introductionmentioning

confidence: 99%

Self‐start synchronous reluctance motor new rotor designs and its performance characteristics

Ganesan

Lenin

2019

Summary Self‐start (often called line start) synchronous reluctance motor (a type of synchronous motor) designed with different rotor structures have been analyzed and compared. The torque, output power, rotor mass, and efficiency are calculated through theoretical study. A genetic algorithm is performed to attain optimal machine parameters. The flux distribution, effect on the inductances, starting torque, average torque, power factor, efficiency, and torque ripple are completely examined by the numerical study. The energy consumption comparison of self‐start synchronous reluctance motor and induction motor are calculated. Further, a study on the effects of end‐ring resistance is discussed for starting and steady‐state conditions. Experimental results reveal that the fabricated high efficient rotor structure is closely correlated with the numerical and theoretical studies.

“…The development of high‐performance PM materials, power electronic devices, and manufacturing techniques have led to increasing interest in the design, control, and performance improvement of PM machines . Various methods have already been proposed in the previous articles for improving performance characteristics of PM machines.…”

Section: Introductionmentioning

confidence: 99%

Magnet shifting for back EMF improvement and torque ripple reduction of a TORUS‐type nonslotted axial flux permanent magnet machine

Mirzahosseini

Darabi

Assili

2019

Summary Permanent magnet (PM) shifting method is one of the ways to improve performance characteristics of PM machines. In this paper, PM shifting method is employed to reduce total harmonic distortion (THD) of the back EMF and torque ripple of a TORUS type nonslotted axial flux permanent magnet (TORUS NS‐AFPM) machine. To fulfill this goal, a formula for calculating back EMF waveform of the machine with shifted PMs is proposed. A 3.7 kW, 1400 rpm TORUS NS‐AFPM machine is selected as case study machine and the accuracy of the proposed formula is confirmed with the help of three‐dimensional finite element method (3‐D FEM). Then by using proposed formula, the effect of PM shifting angle on the back EMF waveform of the machine is investigated. In addition, the case study machine is fabricated and back EMF waveform of the machine with different value of PM shifting angle is analyzed using experimental results. With the help of proposed formula and 3‐D FEM the effect of PM shifting angle on the torque ripple of the machine is studied. In addition, a procedure for calculating optimum value of PM shifting angle is proposed. The obtained results show the effectiveness of the PM shifting method on improving machine back EMF waveform and torque ripple.