Experimental and Numerical Investigations for the Controlled Rotary Damper Dynamically Interacting with the Electromechanical Rotating System

In the paper dynamic electromechanical coupling between the structural model of the rotating machine drive system and the circuit model of the asynchronous motor has been investigated. By means of the computer model of the rotating machine drive system the results of experimental testing have been confirmed. From the obtained results of computations and measurements it follows that the coupling between the considered rotating system and the installed rotary dampers with the magneto-rheological fluid (MRF) results in effective energy dissipation leading to significant reduction of undesired torsional vibrations.

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3D numerical investigations of the swirling flow in a straight diffuser for the variable speed values of the rotor obtained with a magneto-rheological brake

IOP Conference Series Earth and Environmental Science ◽

10.1088/1755-1315/774/1/012019 ◽

2021 ◽

Vol 774 (1) ◽

pp. 012019

Author(s):

RA Szakal ◽

S Muntean ◽

AI Bosioc ◽

R Susan-Resiga ◽

L Vékás

Keyword(s):

Swirling Flow ◽

Variable Speed ◽

Numerical Investigations ◽

Magneto Rheological

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Investigation of Regenerative Braking Performance of Brushless Direct Current Machine Drive System

Applied Sciences ◽

10.3390/app11031029 ◽

2021 ◽

Vol 11 (3) ◽

pp. 1029

Author(s):

Omer Cihan Kivanc ◽

Ozgur Ustun

Keyword(s):

Direct Current ◽

Digital Signal Processor ◽

Internal Resistance ◽

Drive System ◽

Performance Estimation ◽

Regenerative Braking ◽

Duty Ratio ◽

Machine Drive ◽

Resistance Variation ◽

Specific Duty

The brushless direct current (BLDC) machines which are preferred in light electric vehicles (LEVs) come forward as high regenerative braking capability machines due to their permanent magnet excitation and relatively simple operation. In this paper, the regenerative braking capability limits of BLDC machines and their drive circuits are examined by taking into account nonlinear circuit parameters and battery internal resistance variation. During energy recovery from mechanical port to electrical port, the inverter of BLDC machine is operated as a boost converter which enables power flow to a battery. However, the regeneration performance is also heavily dependant on the battery condition, particularly the temperature. By means of the developed detailed circuit model including the non-ideal effects of the boosting converter and the increase of the internal resistance variation which is caused by the temperature variation of the battery and ambient temperature, the specific duty cycle can be determined. The specific duty ratio is then applied in a proposed approach for various operation scenarios. The experimental tests are implemented by a 400 W BLDC machine drive system controlled via a TMS320F28335 digital signal processor. The experimental results show that the proposed comprehensive model presents a proper performance estimation of regenerative braking system under varying battery temperature.

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