scholarly journals Rotational Torque Control of Proximal Two-beam Optical Tweezers by Optical Pulse Width Modulation

2006 ◽  
Vol 72 (12) ◽  
pp. 1531-1536
Author(s):  
Hiroaki KOBAYASHI ◽  
Ichirou ISHIMARU ◽  
Katsumi ISHIZAKI ◽  
Makoto YOSHIDA ◽  
Toshiki YASOKAWA
Keyword(s):  
Optical Tweezers ◽  
Pulse Width ◽  
Optical Pulse ◽  
Pulse Width Modulation ◽  
Torque Control

scholarly journals Feedforward Neural Network-DTC of Multi-phase Permanent Magnet Synchronous Motor Using Five-Phase Neural Space Vector Pulse Width Modulation Strategy

2021 ◽  
Vol 54 (2) ◽  
pp. 345-354
Author(s):  
Fayçal Mehedi ◽  
Habib Benbouhenni ◽  
Lazhari Nezli ◽  
Djamel Boudana
Keyword(s):  
Permanent Magnet ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Permanent Magnet Synchronous Motor ◽  
Direct Torque Control ◽  
Torque Ripple ◽  
Synchronous Motor ◽  
Torque Control ◽  
Space Vector ◽  
Stator Current

In this work, the direct torque control (DTC) is applied to the five-phase permanent magnet synchronous motor (FP-PMSM). The DTC method based on classical space vector pulse width modulation (SVPWM) is a common solution used to overcome traditional problems; such as stator flux ripple, electromagnetic torque ripple and gives more total harmonic distortion (THD) of the stator current. The actual paper is based on improving the performance of DTC-SVPWM by using the feedforward neural networks (FNNs) instead of the proportional-integral (PI) regulators and hysteresis comparators (HCs) of the conventional SVPWM strategy. This algorithm can solve the traditional PI regulators and HCs problems which are represented in responses dynamic and reduce the torque ripple, flux ripple, and the THD of stator current of FP-PMSM drives. The proposed strategy was tested in different tests with simulation using Matlab software.

scholarly journals Modelling and simulation of ZDC controlled PMSG based wind energy conversion system

2018 ◽  
Vol 7 (1.8) ◽  
pp. 46
Author(s):  
Tripura Pidikiti ◽  
Tulasi Ram Das G
Keyword(s):  
Wind Energy ◽  
Energy Conversion ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Dynamic Performance ◽  
Performance Comparison ◽  
Torque Control ◽  
Wind Energy Conversion ◽  
Wind Energy Conversion Systems ◽  
Energy Conversion Systems

This paper presents the comparison of dynamic performance and steady state operation of PMSG wind energy conversion systems with two modulation techniques. Voltage oriented control (VOC) is used for grid-connected converter along with sinusoidal pulse width modulation (SPWM) and Space Vector Modulation (SVM) schemes. The generator is controlled by using zero d- axis current (ZDC) control scheme along with optimal torque control (OTC). Performance comparison with two pulse width modulation schemes through simulation results are presented for 2MW/ 690V/ 9.75Hz Non-Salient Pole PMSG using MATLAB/SIMULINK.

Rotational Speed Control by Optical PWM Operation for Single Cells

2006 ◽  
Vol 18 (6) ◽  
pp. 824-826
Author(s):  
Makoto Yoshida ◽  
◽  
Ichirou Ishimaru ◽  
Katsumi Ishizaki ◽  
Toshiki Yasokawa ◽  
...  
Keyword(s):  
Light Absorption ◽  
Rotational Speed ◽  
Pulse Width ◽  
Optical Pulse ◽  
Pulse Width Modulation ◽  
Single Cells ◽  
Light Pressure ◽  
Illumination Time ◽  
Proximal Points ◽  
Rotational Speed Control

To rotating single cells, we harness light pressure generated by light absorption as a rotating torque, illuminating the two proximal points from different directions using two beams. Rotational speed is controlled by optical pulse width modulation (PWM) that controls the amount of light received per unit of time by controlling the time of illumination. To change the illumination time, the pencil of rays is scanned by a galvanometric mirror.

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