scholarly journals The Operation of UAV Propulsion Motors in the Presence of High External Magnetic Fields

Robotics ◽  
2021 ◽  
Vol 10 (2) ◽  
pp. 79
Author(s):  
Mohammad Heggo ◽  
Anees Mohammed ◽  
Juan Melecio ◽  
Khristopher Kabbabe ◽  
Paul Tuohy ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Steady State ◽  
External Magnetic Field ◽  
Direct Torque Control ◽  
Torque Control ◽  
Stable Operation ◽  
Field Oriented Control ◽  
Inspection Robots ◽  
The Impact ◽  
State Error

The operation and maintenance of converter stations (also known as valve halls) in high voltage DC (HVDC) grids is a key element in long-term, reliable and stable operation, especially in inherently adverse offshore environments. However, the nature of the electromagnetic field environment inside HVDC valve halls presents a challenge for the operation of traditional off-shelf inspection robots. In this paper, the impact of the external magnetic field on the operation of an inspection UAV’s propulsion motors is assessed. An experimental method is proposed to simulate the maximum magnetic field interference to off-shelf UAV motors, which can be used to identify their suitability for use in HVDC valve halls inspection robots. The paper’s experimental results compare the performance of direct torque control and field-oriented control algorithms for propulsion motors under the influence of external magnetic flux. Under the influence of a 177 mT external magnetic field, it was found that using direct torque control, the motor rotational velocity steady-state error was up to 55%. With field-oriented control, the steady-state error was 0%, however the peak-to-peak current draw increased by up to 567%.

scholarly journals Nonlinear Compensation Empyoing Matrix Converter with DTC Controller

2017 ◽  
Vol 7 (1) ◽  
pp. 107 ◽  
Author(s):  
Khalaf S. Gaied ◽  
Ziad H. Salih ◽  
Ahmed R. Ajel ◽  
Mehdi J. Marie
Keyword(s):  
Steady State ◽  
Simulation Analysis ◽  
Direct Torque Control ◽  
Induction Machine ◽  
Matrix Converter ◽  
Torque Control ◽  
Switching Frequency ◽  
The Matrix ◽  
Performance Specifications ◽  
State Error

This paper describes a nonlinear harmful speed and torque controller for fourth order induction motor model. The investigation of optimality and cost function for that base on estimation of Hammerstein-Wiener model with the compensated mathematical model. The matrix converter with direct torque control combination is efficient way to get better performance specifications in the industry.The MC and the DTC advantages are combined together.The reduction of complexity and cost of DC link in the DTC since it has no capacitors in the circuit. However, the controlling torque is a big problem it in DTC because of high ripple torque production which results in vibrations response in the operation of the IM as it has no PID to control the torque directly. The combination of MC with DTC is applied to reduce the fluctuation in the output torque and minimize the steady state error. This paper presents the simulation analysis of induction machine drives using Maltlab/Simulink toolbox R2012a. Design of constant switching frequency MCDTC drive,stability investigation and fault protection as well as controllability and observability with minimum steady state error has been carried out which  proved the effectiveness of the proposed technique.

scholarly journals Parallel Loop Control for Torque and Angular Velocity of BLDC Motors with DTC Commutation

Electronics ◽  
2020 ◽  
Vol 9 (2) ◽  
pp. 279 ◽  
Author(s):  
J. Coballes-Pantoja ◽  
R. Gómez-Fuentes ◽  
J. R. Noriega ◽  
L. A. García-Delgado
Keyword(s):  
Steady State ◽  
Angular Velocity ◽  
Direct Torque Control ◽  
Field Performance ◽  
The Body ◽  
Torque Control ◽  
Control Loop ◽  
Loop Control ◽  
Parallel Loop ◽  
Parallel Control

This paper is focused in the development of a parallel control loop of the angular velocity and torque for Brushless Direct Current (BLDC) motors. This parallel loop is proposed as an improvement for the performance of those cascaded solutions commonly reported in the body of literature of the field. Performance is improved by reducing the steady state error of the speed considerably when compared with the typical cascaded loop solution under a commanded change of torque. In addition, the steady state response of the parallel loop is reached in a shorter time. Simulations were designed to carry out a comparison between both methodologies. The results of these simulations consider only changes in the set point for speed or torque and are reported here. The control signal was applied to a simulated driver using a switching method known as Direct Torque Control of 2 and 3 phases (DTC-2+3P). These preliminary results show that the parallel control loop outperforms the cascaded control of BLDC motors.

Performance Characteristics of Induction Motor with Field Oriented Control Compared to Direct Torque Control

2016 ◽  
Vol 7 (4) ◽  
pp. 1125 ◽  
Author(s):  
Hamdy Mohamed Soliman
Keyword(s):  
Induction Motor ◽  
Direct Torque Control ◽  
Harmonic Distortion ◽  
Torque Control ◽  
Performance Characteristics ◽  
Field Oriented Control ◽  
Advantages And Disadvantages ◽  
Ac Motor ◽  
Drive Systems ◽  
Methods Of Control

With development of power electronics and control Theories, the AC motor control becomes easier. So the AC motors are used instead of the DC motor in the drive applications. With this development, a several methods of control are invented. The field oriented control and direct torque control are from the best methods to control the drive systems. This paper is compared between the field oriented control and direct torque control to show the advantages and disadvantages of these methods of controls. This study discussed the effects of these methods of control on the total harmonic distortion of the current and torque ripples. This occurs through study the performance characteristics of the AC motor. The motor used in this study is an induction motor. This study is simulated through the MATLAB program.

Effects of External Magnetic Field on Intensity of Plasma Flow

2014 ◽  
Vol 597 ◽  
pp. 272-275
Author(s):  
Ching Yen Ho ◽  
Yu Hsiang Tsai ◽  
Chung Ma
Keyword(s):  
Magnetic Field ◽  
Steady State ◽  
External Magnetic Field ◽  
Plasma Flow ◽  
Intensity Distribution ◽  
Transverse Direction ◽  
Radial Direction ◽  
Intensity Profile ◽  
Intensity Enhancement

This paper investigates the intensity distribution along the radial direction for plasma flow subject to external magnetic Field. The toroidal external magnetism is applied in the transverse direction of plasma flow. Considering the steady-state continuity and momentum of the plasma flow subject to external magnetic field, the intensity profile of the plasma is obtained. The results quantitatively verify the intensity enhancement of the plasma with the increasing external magnetic field.

scholarly journals Cuckoo Search Based DTC of PMSM

2018 ◽  
Vol 9 (3) ◽  
pp. 1106 ◽  
Author(s):  
Amir Yassin ◽  
Said Wahsh ◽  
M. Badr
Keyword(s):  
Steady State ◽  
Dynamic Response ◽  
Fuzzy Logic Controller ◽  
Permanent Magnet Synchronous Motor ◽  
Direct Torque Control ◽  
Cuckoo Search ◽  
Torque Control ◽  
Modern Approach ◽  
Pulse Width Modulated ◽  
Search Optimization

<p>Hysteresis controllers (HC) are used to limit the torque and flux in the control band in conventional configuration of direct torque control (DTC) while in the space vector pulse width modulated (SVPWM) DTC, the HC are switched to PI or PID controllers. This paper presents a modern approach for the speed control applied on a DTC of a permanent magnet synchronous motor (PMSM) using the Cuckoo Search Optimization (CSO) algorithm in order to optimize the PI speed controller parameters of the outer loop and PID flux and torque controllers of the inner loop. The system is tested at no load and with a step change in load.</p><p>The performance of the controllers is presented and the results of simulation indicate a very rapid dynamic response and the system achieves the steady state (SS.) in a very short time. Also it shows that both the SS. and dynamic performances are improved by applying of the CSO algorithm. The proposed DTC simulation model of the PMSM is presented using MATLAB / SIMULINK and capable of simulating both the steady-state and dynamic response. The CSO results are compared with another control strategy that incorporates fuzzy logic controller (FLC) with DTC.</p><p> </p>

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