scholarly journals Current Harmonics Controller for Reduction of Acoustic Noise, Vibrations and Torque Ripple Caused by Cogging Torque in PM Motors under FOC Operation

Energies ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2534 ◽  
Author(s):  
Martin Sumega ◽  
Pavol Rafajdus ◽  
Marek Stulrajter
Keyword(s):  
Acoustic Noise ◽  
Torque Ripple ◽  
Control Technique ◽  
Field Oriented Control ◽  
Cogging Torque ◽  
Current Harmonics ◽  
Precise Control ◽  
Three Phase ◽  
Noise Measurements ◽  
A Current

This article presents an effective algorithm to reduce acoustic noise, vibrations and torque ripple caused by cogging torque in three-phase Permanent Magnet (PM) motors under Field Oriented Control (FOC) operation. Cogging torque profile is suitably included into q-axis current reference, which must be then precisely tracked in order to mitigate acoustic noise, vibrations, torque ripple and speed ripple caused by cogging torque. Conventional FOC structure has been extended by a Current Harmonics Controller (CHC) to achieve precise control of dq current harmonics for all operation speeds, which is crucial to reduce impact of cogging torque and increase performance of electric drive with PM motor. Effectiveness of proposed control technique is experimentally verified by vibrations and acoustic noise measurements.

scholarly journals Proposed Commutation Method for Performance Improvement of Brushless DC Motor

Energies ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 6023
Author(s):  
Chang-Sung Jin ◽  
Chang-Min Kim ◽  
In-Jin Kim ◽  
Iksang Jang
Keyword(s):  
Performance Improvement ◽  
Acoustic Noise ◽  
Torque Ripple ◽  
Brushless Dc Motor ◽  
Efficiency Improvement ◽  
Current Harmonics ◽  
Brushless Dc ◽  
Motor Efficiency ◽  
Ac Motor ◽  
Three Phase

This study focused on the efficiency improvement and acoustic noise reduction of brushless DC (BLDC) motors by reducing current harmonics using a novel BLDC commutation method. To achieve these goals, we designed an improved 150° commutation method for a three-phase permanent magnet BLDC motor that can improve the current waveform. Although the 120° commutation method is generally employed for BLDC motors, an improved 150° commutation method is introduced to operate the BLDC with increased efficiency and acoustic noise similar to a brushless AC motor. This study investigated the attributes of various commutation methods, both theoretically and experimentally, to determine the optimal commutation method. The results of this study indicate that the improved 150° commutation method is optimal in terms of harmonic attributes and reduced torque ripple, allowing it to improve motor efficiency and reduce acoustic noise.

scholarly journals Equivalent Phase Current Harmonic Elimination in Quadruple Three-Phase Drives Based on Carrier Phase Shift Method

Energies ◽  
2020 ◽  
Vol 13 (11) ◽  
pp. 2709
Author(s):  
Xuchen Wang ◽  
Hao Yan ◽  
Giampaolo Buticchi ◽  
Chunyang Gu ◽  
He Zhang
Keyword(s):  
Carrier Phase ◽  
Pulse Width Modulation ◽  
Torque Ripple ◽  
Current Harmonics ◽  
Phase Current ◽  
Harmonic Elimination ◽  
Three Phase ◽  
High Control ◽  
Machine Drives ◽  
Transportation Applications

Multiphase drives are entering the spotlight of the research community for transportation applications with their high power density and the possibility of high fault tolerance. The multi three-phase drive is one of the main types of multiphase drives that allows for the direct adoption of commercial three-phase converters and high control flexibility. The elimination of high-frequency current harmonics will reduce the flux linkage harmonics, torque ripple, vibration and noise in machine drives. Therefore, this work introduces a new method to the modelling of equivalent phase current in multi three-phase drives with the double integral Fourier analysis method. A new carrier-based pulse-width modulation (CPWM) method is introduced to reduce the equivalent phase current harmonics by applying proper carrier phase angle to each subsystem in the multi three-phase drives. The proposed angles of carrier signals are analyzed for quadruple three-phase drives, and the corresponding experimental results confirm the significance of the proposed phase-shifted CPWM method to eliminate the equivalent phase current harmonics.

scholarly journals Low cogging torque design and simplified model-free predictive current control for radial-flux dual three-phase permanent magnet electric machines

2019 ◽  
Vol 11 (12) ◽  
pp. 168781401989164
Author(s):  
Hsing-Cheng Yu ◽  
Hung-Wei Lai ◽  
Li-Jhen Chen ◽  
Cheng-Kai Lin
Keyword(s):  
Permanent Magnet ◽  
Control Method ◽  
Torque Ripple ◽  
Electric Machines ◽  
Current Control ◽  
Simplified Model ◽  
Cogging Torque ◽  
Model Free ◽  
Radial Flux ◽  
Three Phase

This study presents two improved designs of eccentric-shaped permanent magnets and teeth-shaped stators in radial-flux dual three-phase permanent magnet electric machines to reduce cogging torque and torque ripple. The finite element analysis (ANSYS Electromagnetics) has been adopted in simulation, and real radial-flux dual three-phase permanent magnet electric machines have been fabricated in experiment to verify the study. Using the radial-flux dual three-phase permanent magnet electric machines in electric machine systems can improve the reliability and obtain higher output torque. In electrical drives and control, a simplified model-free predictive current control method has been proposed and implemented to drive the radial-flux dual three-phase permanent magnet electric machines, and the control law has been achieved by a TMS320F28377S microcontroller of Texas Instruments. The simplified model-free predictive current control method is senseless to parameter variations and back electromotive force of the permanent magnet electric machines, and only needs current sensors to detect six-phase current. The optimal one has been chosen by 14 various switching modes, which has the minimum cost function, and then the converter can be directly driven and controlled in the next sampling period. The features of the simplified model-free predictive current control method can reduce the algorithm calculation and avoid the defect of conventional model-based predictive current control scheme. A proportional-integral speed controller has also been designed to achieve the speed response of the fixed-speed tracking effect. Finally, the feasibility and effectiveness of the proposed simplified model-free predictive current control method for the dual three-phase permanent magnet electric machines can be verified in the experimental and quantitative results.

Research and Simulation of SVPWM Algorithm Based on BP Neural Network

2016 ◽  
Vol 693 ◽  
pp. 1391-1396 ◽  
Author(s):  
Hua Ji ◽  
Zhi Yong Li
Keyword(s):  
Neural Network ◽  
Control System ◽  
Bp Neural Network ◽  
Nonlinear Approximation ◽  
Torque Ripple ◽  
Phase Voltage ◽  
Current Harmonics ◽  
The Neural Network ◽  
Three Phase ◽  
Motor Control System

In this paper, a space vector PWM (SVPWM) control algorithm based on BP neural network is proposed to cope with the complex calculation required in SVPWM through analyzing SVPWM for three phase voltage fed inverter. This method uses the strong nonlinear approximation ability of the BP neural network to fit the eqivalent segment SVPWM modulated wave, modulate with the triangular carrier wave, and then get the control signals of the three phase voltage inverter. A simulation model for PMSM control system was developed by MATLAB/Simulink with the neural network Toolbox. The results show that the BP neural network based SVPWM algorithm makes the motor control system has a smaller current harmonics and torque ripple, and reduce the amount of computation in digital control system with strong guidance.

scholarly journals A Fuzzy based PV-APF Controller for Mitigation of Current Harmonics

2018 ◽  
Vol 7 (1.8) ◽  
pp. 210
Author(s):  
M Naga Chaitanya ◽  
D Rajesh ◽  
K Sujith ◽  
R Santhoshi ◽  
B Phanendra
Keyword(s):  
Active Power ◽  
Control Technique ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Harmonic Compensation ◽  
Current Harmonics ◽  
Linear Load ◽  
Three Phase ◽  
Non Linear Load ◽  
Pv Grid

This paper proposes a concept of Fuzzy based Active Power Filter for mitigating current harmonics in interconnected PV-Grid system. The PV array is connected to the utility grid by using a boost converter and a voltage source converter. For this, a three phase three wire system operated by non-linear load is considered. The increased harmonic content leads to increase in losses, decrease in power factor and many adverse effects. A Fuzzy based instantaneous PQ theory control technique is proposed in this paper for better harmonic compensation. This proposed system is tested and verified using Matlab/Simulink. The results obtained in both PI and fuzzy based APF systems are compared in the aspects of THD and active power. 

Optimization design of magnetic gear integrated PMSG using improved bat algorithm for wave energy conversion

2021 ◽  
pp. 1-18
Author(s):  
Hong Wei Fang ◽  
Yu Wang
Keyword(s):  
Energy Conversion ◽  
Permanent Magnet ◽  
Wave Energy ◽  
Optimization Design ◽  
Acoustic Noise ◽  
Bat Algorithm ◽  
Torque Ripple ◽  
Wave Energy Conversion ◽  
Cogging Torque ◽  
Magnetic Gear

The magnetic gear integrated permanent magnet synchronous generator (MG-PMSG) can reduce the acoustic noise and mechanical loss, which are caused by the mechanical gear box. It also has the merits of increasing efficiency and reducing system volume when it is used for wave energy conversion system. In this paper, an improved bat algorithm (BA) based on velocity weighting factor is proposed. The improved BA is applied for the optimization design of permanent magnet (PM) to reduce the cogging torque of MG-PMSG. The numerical model is constructed by response surface methodology (RSM). The influences of key pole shape parameters on cogging torque were investigated, including the eccentric distance, the pole-arc coefficient and the permanent magnet thickness. A global optimization design is then carried out by using the improved BA, so that the magnet dimensions corresponding to the optimal cogging torque are obtained. Finally, the performances of the MG-PMSG with the optimized permanent magnet are analyzed by finite element method. Results show that cogging torque, steady torque ripple and back electromotive force (EMF) waveform distortion of the optimized MG-PMSG are reduced.

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