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2 results on '"Constantinescu, Catalin"'

1. A modified ultrasound-guided supraclavicular brachial plexus block for the operative fixation of the humerus head and shaft fractures

Author

Adela Hilda Onutu, Constantinescu Catalin, Gabriella Iohom, and Elena Retegan

Subjects
Humerus Head, medicine.medical_specialty, Acoustics and Ultrasonics, Radiological and Ultrasound Technology, business.industry, Brachial Plexus Block, Ultrasound guided, Surgery, Supraclavicular brachial plexus block, Humeral Head, Humans, Medicine, Brachial Plexus, Radiology, Nuclear Medicine and imaging, Anesthetics, Local, business, Ultrasonography, Interventional, Operative fixation, Ultrasonography
Published
2020

2. Low cost and easy to use programmable driver for DC micromotors used in high precision multi axis motion system

Author

Lucian Gheorghe Gruionu, Constantinescu Catalin, and Cerbulescu Catalin

Subjects
Engineering, Cost price, business.industry, 0211 other engineering and technologies, 02 engineering and technology, 021001 nanoscience & nanotechnology, H bridge, Microcontroller, Software, Duty cycle, 021105 building & construction, Electronic engineering, 0210 nano-technology, business, Pulse-width modulation, Motion system, Voltage
Abstract

The present paper presents the hardware and software structure of a programmable driver for DC micromotors. The driver was designed and built for easy integration into a muti axis motion system. The driver is implemented using an 8-bit RISC microcontroller with high performances, but with a low cost price. The main function of the driver is to generate a PWM signal according to its drive voltage in order to obtain the desired speed for the micromotor. Drive voltage can vary in the range [−10, 10] Vdc, which is actually a duty cycle within the range [0, 1] and reversal of direction. PWM signal is applied to the inputs of an H bridge which allows two quadrant command for the micromotor. To achieve high performances with low cost price, an integrated H bridge with MOS technology was chosen.

Published
2017

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