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This paper presents a direct torque control drive system utilizing constant switching frequency controller (CSFC) with EKF based speed estimation. By employing CSFC instead of the conventional hysteresis controller, the torque ripple is reduced and constant switching frequency is achieved, and more importantly, the simple structure of DTC without any modification to the look-up table is maintained...
The simulation of a direct torque hysteresis controller (DTHC) driving an interior permanent magnet synchronous machine (IPMSM) is presented in this paper. The underlying switching concept as well as a proposed experimental setup is discussed. Various simulations, varying the torque and current tolerances, are carried out in the low torque and high torque range. Simulation results show a direct influence...
Induction motor drives supplied from diode front-end rectifiers are commonly used in industrial applications due to their low cost and reliability. However, the two-quadrant operation of such a topology makes the regenerative braking impossible. Braking resistors can be used to dissipate the braking power and provide enhanced braking capability, but additional hardware is then necessary. Alternatively,...
With regard to small DC brushless motors the problem of the cogging torques amplitude is considered. At the aim a special motor prototype, obtained by the substitution of the original ferrite magnets with bonded magnets prepared in the own laboratories, has been realized; such a prototype assumes the role of "reference motor" as regards some quantities introduced as "quality factors"...
In this paper, a new hybrid-excited flux-switching (HEFS) machine is proposed with the outer-rotor configuration, which possesses the distinct feature of fault-tolerant operation. Comparing with the conventional permanent-magnet (PM) machine, it combines merits of flux control, high mechanical integrity, and low-cost. Furthermore, its fault-tolerant feature ensures its continuous operation in the...
Optimization plays a crucial role to bring out a trade-off between the cost and efficiency of permanent magnet motors. Optimization algorithm coupled with analytical magnetic circuit analysis, is one such technique to improve the performance of a motor. However, the non-linear effects like saturation, cross-magnetization, etc. are cumbersome to be modelled analytically. In addition, the interdependency...
In complex industrial situations, modern permanent magnet synchronous motor (PMSM) servo drive system always face different kinds of disturbances, especially constant or slowly-varying disturbances (load disturbances) and periodic disturbances (torque ripples). Conventional disturbance rejection techniques, e.g., the extended state observer based control (ES-OBC) and the disturbance observer based...
In this paper, the circuit model of the parallel connected induction motors driven by single inverter is established. According to the circuit model, the problem of unbalanced electromagnetic torque caused by the wheel diameter difference of the parallel connected motors is analyzed. The weighted vector equation of the parallel connected motors is established. To improve the control performance with...
Direct Torque Control (DTC) technique has been applied in recent times in high performance five-phase induction motor drives during the normal operation of the system. The use of DTC in the multiphase area is far from becoming a reality because it has not been used in competitive multiphase applications where the fault operation needs to be considered. The authors have successfully tested the ability...
The drive performance of permanent magnet synchronous motor (PMSM) can be deteriorated due to various disturbances. In this paper, the problem of speed control for a PMSM system with parameter uncertainties is investigated. A new control algorithm based on nonsingular terminal sliding mode control (NTSMC) is proposed, where the controller is developed for speed regulation. Compared with conventional...
The unbalanced operation of five-phase induction machines is described using the method of steady state symmetrical components and including aspects not yet considered, such as the changes in the airgap induction. Starting from the dynamic equations, described by instantaneous symmetrical components, sequence equations are obtained in terms of steady state symmetrical components, thus establishing...
Direct torque control (DTC) scheme is quite popular in a voltage source inverter fed induction motor (IM) drive. Considering a switching table based algorithm, the flux and torque are directly controlled by applied inverter voltage vectors. There is a direct relation between stator flux and applied inverter voltage vector, which is eventually the stator voltage vector. However, in a current source...
This paper investigates the production tolerances and variations of the lamination and permanent magnet on the cogging torque of the surface permanent magnet (SPM) machine with mass production. The finite element analysis (FEA) and experiment contrasted analysis method is adopted to deal with the additional component cogging torque, of the 12 slots 10 poles combination SPM machine, caused by production...
The proposed fault-tolerant flux-reversal doubly-salient (FT-FRDS) magnetless motor drive consists of armature winding for driving and DC-field winding for field excitation. The purpose of this paper is to investigate two remedial strategies for fault-tolerant operations of the proposed motor drive under short-circuit faults. First, short-circuit phase can be disabled and the short-circuit fault can...
In this paper, a dead-beat direct torque and flux control with a novel sliding-mode stator flux observer is proposed for electric vehicle (EV) drives. Compared to the direct torque control, the proposed scheme exhibits both static and dynamic performances. Since the system parameters have impact on the control effect of the permanent magnet synchronous motor (PMSM) deadbeat-direct torque control (DB-DTC)...
The present paper is concerned with a fundamental study on the phenomenon called Loss of Synchronism (LOS) in a stepping motor from the view-point of rotor-angles in equilibria. Conditions of the rotor are deliberated in terms of its angle, velocity, and acceleration, and a set of three conditions is proposed for determining the state of LOS. A simulation model is constructed in the Simulink environment...
This paper is focused on the electromagnetic and structural design of high-speed synchronous reluctance (HS-SyR) machines. Both design aspects are equally taken into account due to high speed requirements. Two design procedures, both based on multi-objectives stochastic optimization algorithms (OA) and Finite Element Analysis (FEA), are presented and compared in terms of computational time and quality...
In this paper, the authors treat one of the major problems noted in the association of electrical motors fed by the inverters, it is well known as the acoustic and vibratory noise. An electrical propulsion system mainly based on a Doubly Fed Induction Machine (DFIM), operating in motor mode and supplied by two Voltage Source Inverters (VSIs) is introduced. The modeling of the marine propeller is reported...
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