scholarly journals Development of Drone Mounted BLDC Motor Stator using Multi Stacked Structure of Cartridge

2021 ◽  
Vol 12 (6) ◽  
pp. 602-607
Author(s):  
Hun Oh Et.al
Keyword(s):  
External Control ◽  
Bldc Motor ◽  
Stator Core ◽  
Performance Limit ◽  
Copper Conductor ◽  
Heavy Equipment ◽  
Efficient Control ◽  
Long Time ◽  
New Type ◽  
Stator Design

Received:11 november 2020; Accepted: 27 December 2020; Published online: 05 April 2021 Abstract: Drones are used in agriculture and external control, utilizing cameras, various sensors, and autonomous flight functions. However, it is difficult to fly for a long time because of flying with heavy equipment. Therefore, it is necessary to increase the flight time through lightening of the drone itself and efficient control of the BLDC motor. That is, it is necessary to improve the motor itself, which accounts for most of the energy consumption in drone flight. Stator fabrication of existing BLDC motors is done by winding copper wires through individual processes on the stator core through an automated process. However, in the case of an ultra-small BLDC motor, the stator core has a small size and is manufactured using a thin-diameter copper conductor, and thus has a lot of problems in the automation process. Therefore, in this paper, the multi-division coupling structure method of individual teeth of the stator was applied through a new type of BLDC motor stator design. That is, the cartridge type BLDC motor stator was applied to improve and reduce the BLDC motor stator method. Through this, the performance limit of the BLDC motor was improved by combining individual teeth with multiple cartridges. The cartridge type BLDC motor is manufactured by stacking several cartridges on each tooth. Therefore, various performances can be produced according to the connection state of the cartridges

DEFINITION OF THE ELITE QUALITY INDEX AS A NEW TYPE OF THE SOCIAL RESEARCH

2021 ◽  
Vol 4 ◽  
pp. 5-10
Author(s):  
S. FURS ◽  
◽  
A. FEDOSEEV ◽  
Keyword(s):  
Interdisciplinary Research ◽  
Quality Index ◽  
Social Research ◽  
International Study ◽  
Sharp Change ◽  
The Social ◽  
Distribution Of Resources ◽  
Long Time ◽  
New Type ◽  
Definition Of

The article is devoted to the consideration of such an object of interdisciplinary research as the elite, namely, the latest trends in its study. It is shown that the consideration of this phenomenon has been going on for a long time, but now there is a sharp change in the focus of research – a new methodology is being developed. This is due to the fact that the axiom taken is the provision of a significant influence of the elite not only on the distribution of resources (economic, political, administrative) but also on the development (or recession) of the nation as a whole. The article presents a detailed analysis of the methodology for measuring the elite quality index which formed the basis for an international study conducted in 2020.

scholarly journals Research Status on Steel-bamboo Composite Structure

2019 ◽  
Vol 275 ◽  
pp. 01018
Author(s):  
Jialiang Zhang ◽  
Keting Tong ◽  
Pei Wu ◽  
Yushun Li
Keyword(s):  
Composite Structures ◽  
High Capacity ◽  
Building Structures ◽  
Composite Section ◽  
Long Time ◽  
Section Design ◽  
New Type ◽  
Cold Formed Steel ◽  
Composite Wall ◽  
Structural Adhesive

This paper presents a new type of lightweight composite structural system using bamboo-based panel and cold-formed thin-walled steel. The bamboo-based panel and cold-formed steel with C-section and U-section or profiled steel sheet can form various steel-bamboo composite members, including composite slab, composite wall, composite beam and composite column, utilizing structural adhesive or adhesive-screw reinforced joins. The paper summarizes the section design, mechanical experiments of the steel-bamboo composite structures based on the application of bamboo-based panel in modern building structures. Research shows that the two materials can form a perfect composite section and the connection systems are very effective in a long time, composite members have high capacity, ideal stability and ductility. The study shows that steel-bamboo composite components have good prospects in building structures of China.

Stator design of a new type of spherical piezoelectric motor

2010 ◽  
Vol 57 (10) ◽  
pp. 2334-2342 ◽  
Author(s):  
Yung Ting ◽  
Yu-Ren Tsai ◽  
Bing-Kuan Hou ◽  
Shuo-Chun Lin ◽  
Cheng-Chin Lu
Keyword(s):  
Piezoelectric Motor ◽  
New Type ◽  
Stator Design

Time-Domain Analysis and Experimental Verification of Portable Grounding System’s TGR

2014 ◽  
Vol 705 ◽  
pp. 259-262
Author(s):  
Xin Bo Qu ◽  
Bi Hua Zhou ◽  
Ya Peng Fu ◽  
Li Juan Yang ◽  
Nan Zhang
Keyword(s):  
Time Domain ◽  
Time Domain Analysis ◽  
Frozen Soil ◽  
Lightning Protection ◽  
Grounding System ◽  
Grounding Resistance ◽  
Long Time ◽  
New Type ◽  
Set Up ◽  
Difference Time

The portable grounding system plays an important role in the lightning protection system of mobile equipments. But the traditional earth electrodes composed of vertical rods wouldn’t work well or would take a long time to set up in some conditions such as frozen soil, hard clay and so on. In this paper, a new type of portable grounding system which can be quickly spread and folded has been designed. To analyze the TGR’s (Transient Grounding Resistance) time-domain characteristics, the grounding systems have been modeled and simulated with FDTD (Finite Difference Time Domain). The influence rule of electrodes’ number and down-lead’s position to TGR has been studied with numerical analysis and validated with experiments. The results show that the new grounding system works well even on cement floor.

Dynamic responses of the rotor supported by a new type zero-clearance catcher bearing

2017 ◽  
Vol 31 (19-21) ◽  
pp. 1740014
Author(s):  
Yi-Li Zhu ◽  
Zhong-Qiao Zheng
Keyword(s):  
Magnetic Bearing ◽  
Active Magnetic Bearing ◽  
Dynamic Responses ◽  
Failure Event ◽  
Long Time ◽  
New Type ◽  
Amb System ◽  
Rotor Dynamic

Catcher bearings (CB) are required to support the rotor rotating for some time when a failure event of active magnetic bearing (AMB) system occurs. For this purpose, a new type zero-clearance catcher bearing (NTZCB) is proposed. The influences of different parameters of NTZCB on the rotor dynamic responses are theoretically and experimentally analyzed. The results indicate that choosing relatively soft spring and heavy moveable supporting pedestal can effectively buffer the rotor vibrations, which makes it possible for the rotor to keep rotating with the support of the CB system for a long time.

scholarly journals THE INTRINSIC RHYTHM OF THE TURTLE'S HEART STUDIED WITH A NEW TYPE OF CHRONOGRAPH, TOGETHER WITH THE EFFECTS OF SOME DRUGS AND HORMONES

1930 ◽  
Vol 14 (1) ◽  
pp. 105-115 ◽  
Author(s):  
Alfred L. Loomis ◽  
E. Newton Harvey ◽  
C. MacRae
Keyword(s):  
Oxygen Supply ◽  
Pituitary Hormone ◽  
Ringer’S Solution ◽  
Long Time ◽  
New Type ◽  
Time Periods

A chronograph is described for recording continuously the rates of many different kinds of rhythmic processes over long time periods. The rate is read directly from the length of a line of ink, drawn by a moving pen. Rates of beat of excised turtle's hearts in Ringer's solution have been recorded at 25°C. under constant conditions of temperature, pH, and oxygen supply for periods of 36 hours. Regular periodic variations in the fundamental rhythm are figured, as well as rates of extraordinary constancy. The effects of adrenalin, ephedrin, thyroxin, α and ß pituitary hormone insulin, nicotin, and atropin are described in the text.

One-Way Function Construction Based on the MQ Problem and Logic Function

2012 ◽  
Vol 220-223 ◽  
pp. 2360-2363
Author(s):  
Yan Jun Sun ◽  
Chang Ming Liu ◽  
Hai Yu Li ◽  
Zhe Yuan
Keyword(s):  
Public Key Cryptography ◽  
Public Key ◽  
Public Key Cryptosystem ◽  
Logic Function ◽  
The Public ◽  
Relative Safety ◽  
Core Function ◽  
Long Time ◽  
New Type ◽  
One Way Function

Multivariate quadratic based public-key cryptography called MQ problem which based on calculation of a secure cryptography of multivariate equations and MQ cryptography security is based on the difficulty of the solution of multivariate equations. But computer and mathematician scientists put a lot of effort and a long time to research MQ cryptography and they have proved that MQ cryptography is NP complete problem. Therefore, before the P problem Equal to the NP problem we do not figure out selected multivariate equations by random in polynomial time. So we can use this feature to construct the relative safety method of the public key encryption. A new type of public-key cryptosystem has been brought up in this paper that one-way shell core function which has such advantages as more security and flexibility, and provides a more inclusive public-key cryptosystem.

A NEW TYPE OF ARTIFICIAL TRACHEA FOR CARINAL BIFURCATION: A REPORT OF LONG TIME SURVIVAL AND HISTOLOGICAL EXAMINATIONS

ASAIO Journal ◽  
1999 ◽  
Vol 45 (2) ◽  
pp. 129
Author(s):  
T Sekine ◽  
T Nakamura ◽  
H Ueda ◽  
K Matsumoto ◽  
Y Yamamoto ◽  
...  
Keyword(s):  
Long Time ◽  
New Type

scholarly journals A Stochastic Model for Phylogenetic Trees

2009 ◽  
Vol 46 (2) ◽  
pp. 601-607 ◽  
Author(s):  
Thomas M. Liggett ◽  
Rinaldo B. Schinazi
Keyword(s):  
Stochastic Model ◽  
Phylogenetic Tree ◽  
Mutation Rate ◽  
Phylogenetic Trees ◽  
Birth Rate ◽  
Long Time ◽  
New Type ◽  
Birth And Death Chain ◽  
Fixed Distribution ◽  
Simple Stochastic Model

We propose the following simple stochastic model for phylogenetic trees. New types are born and die according to a birth and death chain. At each birth we associate a fitness to the new type sampled from a fixed distribution. At each death the type with the smallest fitness is killed. We show that if the birth (i.e. mutation) rate is subcritical, we obtain a phylogenetic tree consistent with an influenza tree (few types at any given time and one dominating type lasting a long time). When the birth rate is supercritical, we obtain a phylogenetic tree consistent with an HIV tree (many types at any given time, none lasting very long).

On Preparation of In Situ Composite Steel with Ultra-High Strength and its Thermal Stability

2010 ◽  
Vol 152-153 ◽  
pp. 436-440
Author(s):  
Jun Zhao ◽  
Han Zhang ◽  
Zhi Wang ◽  
Hong Yan Zhai ◽  
Quan Xing Wen ◽  
...  
Keyword(s):  
Cold Rolling ◽  
Crystal Size ◽  
Steel Plate ◽  
Lath Martensite ◽  
Rolling Direction ◽  
High Strength ◽  
Long Time ◽  
New Type ◽  
Lath Morphology

A new type of in-situ composite nano-multilayer plate with ultra-high strength (b 2112 MPa), Q235 steel plate with nano-layered structure of lath martensite produced by severe cold-rolling, was developed. After cold-rolling, subsequent annealing has great effect on the deformed lath morphology and grain refinement. Microstructure recrystallizing course have taken place after long time annealing at 350 °C. The recrystallization activation energy is 151 kJmol-1. Microstructure characteristics along rolling direction arrangement was decreased after annealing at 400 °C. In addition to the ultrafine ferrite grains, nano-carbides precipitated uniformly in the specimen annealed at 500 °C. Annealing at and above 600 °C resulted in coarse ferrite grains with spheroidized coarse carbides, causing grain growth. The average crystal size is about 4.7 m after annealing for 60 min at 600 °C.

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