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Nowadays the majority of applications are demanding more and more compact, cost effective and robust solutions for their electric drives. In this context permanent magnet synchronous machines are considered as a good candidate due to their high torque density. This torque density is obtained thanks to high power rare earth magnets with both high remanence and high coercive force. However, the magnets...
Electric vehicles offer the capability to recover energy by electric braking and therefore to extend the range. Generally, the total demanded brake force of a vehicle is divided and allocated to the front and the rear wheels due to safety and stability issues. Consequently, common electric vehicles with only one central electric machine which drives one axle cannot exhaust the whole potential of recuperation...
This paper proposes a new approach flux-weakening control strategy of the separately excited DC machine. The proposed method is based on the closed-loop speed control in which the field current is independently controlled to adjust the flux-linkage in the flux-weakening operation. In order to achieve the maximum torque in the constant-torque region, the maximum field current is employed, while it...
Electric vehicles offer the capability to recover energy by electric braking and therefore to extend the range. Due to the dynamic axle load shift during brake applications and corresponding brake force distributions, drive train topologies with single front drive and single rear drive have different potentials with regard to recuperation. The axle load shift of a vehicle is significantly influenced...
A torque converter is an essential part of an automatic transmission. It is a hydrodynamic device that has most influence on the transient response of a vehicle such as gear shifting and vehicle launching. In order to study such characteristics accurately, dynamic analysis of the torque converter is necessary. The zero order torque converter model of Kotwicki has been widely used for control design...
Ships stability and safety are always threatened by the unavoidable sway in the complicated situation of the sea, e.g. strong wind and roaring waves. Ensuring the stability of the ship as a difficult task has received its popularities in the community in the past few decades. However, conventional control methods such as sliding mode control (SMC) and Proportional integral derivative (PID) fail to...
In industries, induction motors are widely used because they are cheap, rugged, requires less maintenance, and easy to operate. Although reliable, yet they are subjected to different types of failures/faults. Unbalanced voltage supply to the induction motor is one such external fault which can result in problems like excessive heating due to more losses, over-voltages, mechanical oscillations, acoustic...
To improve disturbance rejection ability of permanent magnet synchronous motor (PMSM) system, a novel sliding-mode reaching law is proposed in this paper. Then, based on this reaching law, a sliding-mode load torque observer is presented, which is used as feedforward value to compensate the output of speed PI regulator. Simulation results show that system robustness can be enhanced greatly and the...
The structure of switch table mode direct torque control (DTC) is simple, in which the stator flux space is divided into 6 regions. But traditional stator flux sector judgment is much more time-consuming due to the trigonometric calculations in the orthogonal stationary coordinates. A new method is proposed to make stator flux sector judgment which is implemented in 60° coordinate system.
Functional Electrical Stimulation appears currently as a promising solution improving the living conditions for victims of spinal cord injury and stroke. Thus, many control strategies have been employed. This paper deals with the control of the flexion-extension of the elbow joint. At first, two Functional Electrical Stimulation controllers are developed namely Proportional-Derivative and Sliding...
This paper explores the design, analysis and simulation of a high speed disk-type (axial flux) permanent magnet (AFPM) synchronous motor. This motor has rated power 0.5 hp at speed of 60,000 rpm used in some special industrial applications. The design of high speed AFPM motor is performed using analytical relations, and sizing of various components including dimensions, magnetic specifications and...
The purpose of this paper is to present a brief comparison between a conventional hexacopter and a cant angle hexacopter. A conventional hexacopter has got all its 6 rotors fixed and thrusted upwards in the body frame which gives it a decoupled 4 DOF motion or a coupled 6 DOF motion. But a cant angle hexacopter has all its six rotors canted at an angle tangentially to the radius of the frame. It provides...
This paper deals with the induction machine's control inside a field oriented control (FOC) plan, a fractional order proportional integral (FOPI) controller is applied to ensure the speed control. PI and FOPI controllers have the similar structure but the fractional controller considers fractional integration orders in concluding the control action. Thanks to the fractional order integral we can get...
This study investigates the speed control of single-phase induction motor capacitor starting using an experimental work and simulation. Single phase induction motors are simple, robust and reliable and are used in enormous numbers especially in domestic and commercial application where 3phase supplies are not available. The laboratory work has been done and the results show performance of the motor...
This paper presents the comparison of conventional PI controller and Fuzzy controller for Induction Motor (IM) drive. The design of Fuzzy controller is carried out by fuzzy set theory in MATLAB/Simulink 2013a, using Takagi-Sugeno (T-S) fuzzy model. The simulation results for both controllers are then compared and the results revealed that T-S Fuzzy Controller perform better in terms of control delay...
Quad copters are VTOL aerial robot systems and has complex dynamics in spite of its simple design. In the present work, a quadcopter of plus configuration is assembled and its flight characteristics are experimentally studied. To stabilize the system during its flight a KK multicopter platform is used. Flight stabilization is done and data of motor input voltage is acquired using a arducopter flight...
In this study, we aimed to develop a dragonfly-like flapping robot with four wings and achieve advanced flight such as hovering and sudden turn. We developed a two-wings-flapping-robot that links the flapping motion moving the wing up and down and feathering motion twisting the wing and perform at the same time. Next, we investigated the performance of the developed robot whether it's possible to...
Line-start interior permanent magnet (LSIPM) motors are vulnerable to limit cycles and often experience severe torsional oscillations. This paper presents a technique for detection of torsional oscillations in LSIPM motors based on stator current signatures. Rotor speed variations associated with torsional oscillations in a LSIPM motor influences the electrical supply, and introduces variable amplitude...
This paper analysis and compares the different driving techniques for the brushless DC motors (BLDC). First, the conventional block commutation technique used to drive the BLDC is discussed with respect to the produced torque ripple. Second, the modified techniques like the overlap and phase advance techniques discussed as well. Finally, a combined driving technique including the phase advance and...
This paper suggests a PI controller with adding rate limiter anti-windup loop for pitch angle control system of variable speed wind turbine (VSWT). The rate limiter anti-windup loop prevents the overloading on the wind Energy conversion system (WECS) at a high and fast change in wind speed by improving the control system response. Also the paper analyzes the rate limiter anti-windup loop and suggests...
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