Investigation on Driving Force of Ball Bearing Motor

2015 ◽  
Vol 778 ◽  
pp. 199-204
Author(s):  
Hang Yang ◽  
Zheng Wei Zhang ◽  
Xin Fang Zhang ◽  
Xue Feng Liu ◽  
Gang Peng
Keyword(s):  
Thermal Expansion ◽  
Electromagnetic Force ◽  
Driving Force ◽  
Ball Bearing ◽  
Threshold Current ◽  
Working Principle ◽  
Driving Torque

To study ball bearing motor working principle, an ingenious experiment was self-designed, which results indicated that the nature for driving torque of the ball bearing motor was thermal expansion rather than electromagnetic force as generally considered. Furthermore, the threshold current and cutoff temperature for the ball bearing motor were found in our experiment.

scholarly journals Experimental and Numerical Study of a Thermal Expansion Gyroscope for Different Gases

Sensors ◽  
2019 ◽  
Vol 19 (2) ◽  
pp. 360 ◽  
Author(s):  
Guillaume Kock ◽  
Philippe Combette ◽  
Marwan Tedjini ◽  
Markus Schneider ◽  
Caroline Gauthier-Blum ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Gas Flow ◽  
Numerical Study ◽  
Rotational Velocity ◽  
Measurement Range ◽  
Gas Temperature ◽  
Hot Air ◽  
Working Principle ◽  
Set Up ◽  
Different Gases

A new single-axis gas thermal gyroscope without proof mass is presented in this paper. The device was designed, manufactured and experimentally characterized. The obtained results were compared to numerical simulation. The working principle of the gyroscope is based on the deflection of a laminar gas flow caused by the Coriolis effect. A bidirectional hot air flow is generated by alternating activation of two suspended resistive micro-heaters. The heated gas is encapsulated in a semi-open cavity and the gas expands primarily inside the cavity. The thermal expansion gyroscope has a simple structure. Indeed, the device is composed of a micromachined cavity on which three bridges are suspended. The central bridge is electrically separated into two segments enabling to set up two heaters which may be supplied independently from each other. The two other bridges, placed symmetrically on each side of the central bridge, are equipped with temperature detectors which measure variations in gas temperature. The differential temperature depends on the rotational velocity applied to the system. Various parameters such as the heating duty cycle, the type of the gas and the power injected into the heaters have been studied to define the optimal working conditions required to obtain the highest level of sensitivity over a measurement range of around 1000°/s. The robustness of the device has also been tested and validated for a shock resistance of 10,000 g for a duration of 400 µs.

Working Principle and Mechanics Analysis of Circular Bundling Machine

2013 ◽  
Vol 397-400 ◽  
pp. 915-918
Author(s):  
Juan Wei ◽  
Wen Pu Shi
Keyword(s):  
Rigid Body ◽  
Driving Force ◽  
Angular Speed ◽  
Mass Center ◽  
Working Process ◽  
Roller Diameter ◽  
Mechanics Analysis ◽  
Working Principle

Mechanical principles are employed to analyze the working process of the modern agricultural circular bundling machine, the motion theorem of mass center of rigid body and the theorem of moment of momentum with respect to the centroid are used to give the relations between the driving force, feed roller diameter and angular speed and so on, the conclusions show the feasibility and technique in the design of the circular bundling machine.

scholarly journals Effects of operation temperature on thermal expansion and main parameters of radial ball bearings

2015 ◽  
Vol 19 (5) ◽  
pp. 1835-1844 ◽  
Author(s):  
Radivoje Mitrovic ◽  
Ivana Atanasovska ◽  
Natasa Soldat ◽  
Dejan Momcilovic
Keyword(s):  
Finite Element ◽  
Thermal Expansion ◽  
Ball Bearing ◽  
Load Capacity ◽  
Radial Clearance ◽  
Contact Period ◽  
Ball Bearings ◽  
Finite Element Analyses ◽  
Main Bearing ◽  
Operation Temperature

The research of influence of operation temperature on the thermal expansion and main parameters of radial ball bearings is presented in this paper. The main bearing parameters are identified in accordance with the increasing requests concerning stability and load capacity. A series of Finite Element Analyses is performed for quasi-static analysis of all identified bearing parameters during contact period in referent temperature. Then, the dependence of bearing material characteristics on the operation temperature is discussed. Few series of Finite Element Analyses are performed for a particular radial ball bearing type, with characteristics in accordance with manufacturer specifications, for several operation temperatures. These two problems analyses include consideration of relation between the initial radial clearance, thermal expansion strains and contact deformations of the parts of the bearing assembly. The results for radial ball bearing parameters are monitored during a ball contact period for different temperatures and the appropriate discussion and conclusions are given. The conclusions about the contribution of developed procedure in defining the optimum operation temperature range are shown.

scholarly journals Distribution of driving force beneath wheeled vehicle with varying center of gravity

2019 ◽  
Vol 11 (1) ◽  
pp. 168781401982559 ◽  
Author(s):  
Chen Zhou ◽  
Xin-Hui Liu ◽  
Wei Chen ◽  
Fei-Xiang Xu ◽  
Bing-Wei Cao
Keyword(s):  
Driving Force ◽  
Full Time ◽  
Gravity Center ◽  
Driving System ◽  
Virtual Lab ◽  
Wheel Drive ◽  
Environment Simulation ◽  
Working Principle ◽  
Multi Body ◽  
Driving Force Analysis

Driving force analysis is performed on the no-spin differential and full-time all-wheel-drive vehicle; this thesis takes an automatic loading mixing vehicle as an example to introduce the compositions and working principle of the driving system. Based on the tire-ground mechanics, the model of the dynamics and the kinematics is established under the walking straight and steering conditions. According to the theoretical model, the influence of the vehicle’s gravity center on the moving system is analyzed. Co-simulation based on LMS Imagine Lab AMESim and LMS Virtual Lab Motion is performed to build the hydraulic driving system and the multi-body dynamics system models. Based on the tire-ground load environment simulation model built by 1D + 3D, various positions of the gravity center of the model are set to compare with the theoretical analysis. Various weight blocks are also added to change the location of the gravity center in the practical experiment. The conclusions that different gravity center positions lead to the change of the driving torque distribution are proved by the simulation results and experimental data.

Design and Simulation of a Micromachined CMOS Temperature Sensor

2009 ◽  
Vol 60-61 ◽  
pp. 334-338
Author(s):  
Hong Yu Ma ◽  
Qin Gan Huang ◽  
Ming Qin
Keyword(s):  
Thermal Expansion ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Low Cost ◽  
Wheatstone Bridge ◽  
Cmos Process ◽  
Piezoresistive Effect ◽  
Working Principle ◽  
Thermal Expansion Coefficient Mismatch ◽  
Mismatch Effect

A design and simulation of a fully CMOS compatible micromachined multilayer cantilevers-based environmental thermometer are presented. The operation principle of the structure is depending on the mismatch effect of thermal expansion coefficient and the piezoresistive effect of polysilicon in CMOS process. Upon temperature variation, the deformation of the multilayer cantilever resulted from the large thermal expansion coefficient mismatch of different materials can be sensed and translated to an electrical voltage output by using a symmetric piezoresistive Wheatstone bridge. The mechanical characteristics of the device are analyzed with the extension of bi-layer Timoshenko model and the output of the read-out circuit is also simulated. The calculation and simulation show that the device with bi-direction deformation may have wide temperature range from -100 to 100°C and sensitivity about 0.15mV/°C, which fit the demand of radiosonde for environmental temperature measurement. This sensor may also have other favorable features, such as micro size, low-cost due to its working principle and compatibility with commercial CMOS process.

Line length dependence of threshold current density and driving force in eutectic SnPb and SnAgCu solder electromigration

2008 ◽  
Vol 103 (7) ◽  
pp. 073701 ◽  
Author(s):  
Min-Seung Yoon ◽  
Min-Ku Ko ◽  
Bit-Na Kim ◽  
Byung-Joon Kim ◽  
Yong-Bae Park ◽  
...  
Keyword(s):  
Current Density ◽  
Driving Force ◽  
Threshold Current ◽  
Line Length ◽  
Threshold Current Density ◽  
Snagcu Solder ◽  
Length Dependence ◽  
Eutectic Snpb

A Microvalve Driven by a Ferrofluid-Based Actuator

2012 ◽  
Vol 433-440 ◽  
pp. 3767-3772 ◽  
Author(s):  
Tong Gang Liu ◽  
Jian Wu ◽  
Cong Xia ◽  
Zi Hang Qian
Keyword(s):  
Magnetic Field ◽  
Fluid Flow ◽  
Applied Magnetic Field ◽  
Driving Force ◽  
Magnetic Force ◽  
Ansys Software ◽  
Electromagnetic Actuation ◽  
Working Principle

A novel ferrofluid-based microvalve adopting an electromagnetic actuation is presented. In the device, ferrofluid controlled by magnetic force is used as a microactuator. The deflection of the diaphragm caused by the ferrofluid-based actuator opens or closes the fluid flow in the microchannel. A detailed description of the design and working principle of the microvalve is presented. The driving force generated by the ferrofluid under applied magnetic field has been measured by a microforce sensor. And the deflection of the diaphragm has been simulated by ANSYS software.

Design of a Microfactory

2002 ◽  
Author(s):  
Nozomu Mishima ◽  
Tamio Tanikawa ◽  
Kiwamu Ashida ◽  
Hitoshi Maekawa
Keyword(s):  
Energy Consumption ◽  
Basic Concept ◽  
Machine Tools ◽  
Driving Force ◽  
Manufacturing System ◽  
Ball Bearing ◽  
Design Concepts ◽  
Reduce Energy Consumption ◽  
Small Parts ◽  
Space Occupation

This paper describes the concept of a “microfactory” and design basics of its components. The microfactory is a super-miniature manufacturing system consists of miniature machine tools and manipulators. The authors proposed the concept and prototyped the first performable microfactory later in 1999. The former part of the paper introduces the basic concept and effort to systemize the factory. The concept was first proposed in 1990 and was expected to reduce energy consumption and space occupation of small parts fabrication. In 1996, the “micro-lathe” was developed and showed an unexpectedly good machining capability. The success of the micro-lathe was the driving force to systemize the rest of the microfactory. The newly prototyped microfactory was able to machine several small parts and assemble them into a miniature ball bearing to show its capability. The latter half of the paper describes design concepts, theories and tools that were used in designing the each component of the microfactory.

Sticking of a Linear-Guideway Type Recirculating Ball Bearing

2017 ◽  
Vol 139 (3) ◽  
Author(s):  
Hiroyuki Ohta ◽  
Genta Hanaoka ◽  
Yusuke Ueki
Keyword(s):  
Driving Force ◽  
Ball Bearing ◽  
Sliding Friction ◽  
Stroke Length ◽  
Rolling Moment ◽  
Moving Body ◽  
Moment Load ◽  
Rolling Balls

In this paper, the driving force of a linear-guideway type recirculating ball bearing (linear bearing) is measured and explained as the first step toward an understanding of sticking, which is the significant increase in driving force required to move a linear bearing under back-and-forth operation with a short stroke length. First, the driving force required for operation of a test bearing (which is a linear-guideway type recirculating ball bearing with load balls) and acceleration of a moving body (which consists of a carriage of the test bearing, an arm, and weight) were measured. The measurements showed that the sticking occurred when the test bearing, under a relatively higher rolling moment load, was driven in an offset position for a certain period. Next, the driving force of a test bearing with alternating load balls and spacer balls was measured, and it was clear that the cause of the sticking was the sliding friction between rolling balls. Finally, the ball locations in the load zone of the test bearing with load balls were observed in operation, and the occurrence process of the sticking is explained.

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