Control Scheme to Minimize Torque Ripple of SRM

2020 ◽  
pp. 103-109
Author(s):  
M. Venkatesh ◽  
Vijayasri Varshikha Joshi ◽  
K. L. Mounika ◽  
B. Veeranarayana
Keyword(s):  
Torque Ripple ◽  
Control Scheme

An efficient Hardware implementation of modified torque Prescient control scheme for denigration of torque ripple in PMSM

2021 ◽  
Author(s):  
R. Vidyalakshmi ◽  
K. Gaayathry ◽  
N. Subha Lakshmi ◽  
S. Sundar ◽  
M. Suresh ◽  
...  
Keyword(s):  
Hardware Implementation ◽  
Torque Ripple ◽  
Control Scheme

Analysis and Implementation of a High Boost Ratio DC-DC Converter for Minimizing Commutation Torque Ripple in Brushless DC Motor

2016 ◽  
Vol 7 (2) ◽  
pp. 583
Author(s):  
M. Senthil Raja ◽  
B. Geethalakshmi
Keyword(s):  
Closed Loop ◽  
Torque Ripple ◽  
Dc Motor ◽  
Duty Ratio ◽  
Brushless Dc Motor ◽  
Loop Control ◽  
Brushless Dc ◽  
Control Scheme ◽  
Converter Topologies ◽  
Commutation Torque Ripple

Brushless dc motor still suffers from commutation torque ripple, which primarily depends on transient line current in the commutation interval. In order to control the incoming and outgoing phase currents to change at the same rate during commutation, this paper presents a novel high boost ratio DC-DC circuit topology in the front end of the inverter. With a suitable closed loop control scheme, the proposed high boost ratio DC-DC converter is operated with two different duty ratios one during commutation period and the other during non commutation period. The cause of commutation ripple is analyzed, and the way to adjust the duty ratio for obtaining the desired dc link voltage is introduced in detail. Finally, simulation and experimental results show that, compared with the existing dc–dc converter topologies, the proposed method can obtain the desired voltage much faster and minimize commutation torque ripple more efficiently

scholarly journals DTC-ANN-2-level hybrid by neuronal hysteresis with mechanical sensorless induction motor drive using KUBOTA observer

2020 ◽  
Vol 11 (1) ◽  
pp. 34
Author(s):  
Dris Ahmed ◽  
Bendjebbar Mokhtar ◽  
Belaidi Aek
Keyword(s):  
Direct Torque Control ◽  
Harmonic Distortion ◽  
Torque Ripple ◽  
Drive System ◽  
Torque Control ◽  
Stator Current ◽  
Ac Drive ◽  
Control Scheme ◽  
Stator Flux ◽  
Robust Response

In this paper, DTC is applied for two-level inverter fed IM drives based on neuronal hysteresis comparators and The Direct Torque Control (DTC) is known to produce quick and robust response in AC drive system. However, during steady state, torque, flux and current ripple. An improvement of electric drive system can be obtained using a DTC method based on ANNs which reduces the torque and flux ripples, the estimated the rotor speed using the KUBOTA observer method based on measurements of electrical quantities of the motor. The validity of the proposed methods is confirmed by the simulation results.The THD (Total Harmonic Distortion) of stator current, torque ripple and stator flux ripple are determined and compared with conventional DTC control scheme using Matlab/Simulink environment.

Sliding Mode Control of Switched Reluctance Motor with High Torque in Low Speed

2013 ◽  
Vol 694-697 ◽  
pp. 2085-2088
Author(s):  
Ying Zhao ◽  
Shuang He Wu ◽  
Huan Huan Liu ◽  
Nai Cheng Du
Keyword(s):  
Sliding Mode Control ◽  
Sliding Mode ◽  
Switched Reluctance Motor ◽  
Torque Ripple ◽  
Paper Analysis ◽  
Switched Reluctance ◽  
Mode Control ◽  
Control Scheme ◽  
Reluctance Motor ◽  
Mechanical Sensor

This paper analysis the problem of a switched reluctance motor (SRM), which is based on the phase currents by using three independent current sensors. In addition, the reaching condition and stability conditions of sliding mode control (SMC) method has been discussed, and it has been applied to SRM speed control loop that compensates the torque ripple on the torque output. The proposed sliding mode controller performs better than the traditional PI controllers and is also more effectively to the external disturbances. For the switched reluctance motor, one of the factors of the torque ripple is mutual inductances, so the mathematical model of the SRM should consider its influence. And, the mechanical sensor has been used to sense the rotor position. The simulation experiment results of the control scheme using Matlab show that the proposed method for the switched reluctance motor is effective.

Feedforward Transient Compensation Control for DFIG Wind Turbines During Both Balanced and Unbalanced Grid Disturbances

2013 ◽  
Vol 49 (3) ◽  
pp. 1452-1463 ◽  
Author(s):  
Jiaqi Liang ◽  
Dustin Howard ◽  
Jose Restrepo ◽  
Ronald Harley
Keyword(s):  
Low Voltage ◽  
Torque Ripple ◽  
Current Control ◽  
Control Loop ◽  
Induction Generators ◽  
Component Decomposition ◽  
Current Controller ◽  
Control Scheme ◽  
Doubly Fed ◽  
Unbalanced Grid

A feedforward transient compensation (FFTC) control scheme with proportional-integral-resonant current regulators is proposed to enhance the low-voltage ride through (LVRT) capability of doubly fed induction generators (DFIGs) during both balanced and unbalanced grid faults. Compensation for the DFIG stator transient voltage is feedforward injected into both the inner current control loop and the outer power control loop. The FFTC current controller improves the transient rotor-current control capability and minimizes the DFIG control interruptions during both balanced and unbalanced grid faults. Without the need of sequence-component decomposition, the torque ripple is reduced by injecting 60- and 120-Hz rotor-current components during unbalanced stator voltage conditions. The proposed FFTC control introduces minimal additional complexity to a regular DFIG vector-control scheme and shows promising enhancements in the LVRT capability of DFIGs. Simulation and experimental results are presented to demonstrate the effectiveness of the proposed FFTC control scheme.

scholarly journals Nonlinear Speed Control of Switched Reluctance Motor Drives Taking into Account Mutual Inductance

2008 ◽  
Vol 2008 ◽  
pp. 1-11 ◽  
Author(s):  
M. Alrifai ◽  
M. Zribi ◽  
R. Krishnan ◽  
M. Rayan
Keyword(s):  
Acoustic Noise ◽  
Speed Control ◽  
Switched Reluctance Motor ◽  
Torque Ripple ◽  
Two Phase ◽  
Switched Reluctance ◽  
Control Scheme ◽  
Reluctance Motor ◽  
Simulation Results ◽  
Switched Reluctance Motor Drives

A speed control algorithm is proposed for variable speed switched reluctance motor (SRM) drives taking into account the effects of mutual inductances. The control scheme adopts two-phase excitation; exciting two adjacent phases can overcome the problems associated with single-phase excitation such as large torque ripple, increased acoustic noise, and rotor shaft fatigues. The effects of mutual coupling between two adjacent phases and their contribution to the generated electromagnetic torque are considered in the design of the proposed control scheme for the motor. The proposed controller guarantees the convergence of the currents and the rotor speed of the motor to their desired values. Simulation results are given to illustrate the developed theory; the simulation studies show that the proposed controller works well. Moreover, the simulation results indicate that the proposed controller is robust to changes in the parameters of the motor and to changes in the load torque.

3-Level Inverter Fed Direct Torque Control of Induction Motor without Using Medium Vectors

2014 ◽  
Vol 573 ◽  
pp. 150-154
Author(s):  
R. Dharmaprakash ◽  
Joseph Henry
Keyword(s):  
Induction Motor ◽  
Control Algorithm ◽  
Natural Extension ◽  
Direct Torque Control ◽  
Torque Ripple ◽  
Torque Control ◽  
Control Scheme ◽  
Low Torque ◽  
Torque Ripples ◽  
Steady State Performance

This paper proposes the natural extension of classic switching table based direct torque control of induction motor modified for 3-level diode clamped inverter. The proposed method has the advantages of fewer harmonic in the output and low torque ripples. The switching table direct torque control scheme is adopted due to the simplicity of its control algorithm. To demonstrate the performance of proposed multilevel inverter fed direct torque control, the simulations are carried out for constant speed under no load and step change in load. The comparison of the dynamic and steady state performance in terms of torque ripple of the 2-level inverter and 3-level inverters are presented.

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