搜索结果: 1-15 共查到“工学 motors”相关记录17条 . 查询时间(0.093 秒)
Cilia — short, hair-like fibers — are widely present in nature. Single-celled paramecia use one set of cilia for locomotion and another set to sweep nutrients into their oral grooves. Researchers at B...
Dynamics Analysis of a Parallel Mill-turn Tool Spindle Head Driven by Dual-Linear Motors Using Extended
NC machine tools dynamics modeling transfer matrix method (TMM)
2011/8/4
The hybrid dynamics of multi-rigid-body and multi-flexible-body system becomes the mainstream of multi-body dynamics. Currently there lacks a compact approach to model the hybrid dynamics, especially ...
Detection of static eccentricity for permanent magnet synchronous motors using the coherence analysis
Permanent magnet synchronous motor eccentricity fault diagnosis spectral analysis
2010/11/22
This paper reports on work to detect the static eccentricity faults for permanent magnet synchronous motor (PMSM) using spectral analysis methods. Measurements are carried out by collecting the stator...
Experimental investigation of shaft transducerless speed and position control of ac induction and interior permanent magnet motors
IPM Motor induction motor sensorless vector control speed and position control high frequency signal injection
2010/10/12
In order to drive AC motors with high efficiency and high motion performance, and to provide accurate speed/position control, motor shaft speed and/or position feedback is required. For this purpose, ...
NASA Buys Additional Space Shuttle Reusable Solid Rocket Motors
NASA Additional Space Shuttle Solid Rocket Motors
2009/12/18
NASA has purchased two reusable solid rocket motors from ATK Launch Systems Inc. of Brigham City, Utah, to provide a "launch on need" rescue capability for the final planned space shuttle mission, tar...
Heat loss optimisation in CNC motors
Resistant forces Open-architecture control Free-running pulse width modulated driver
2009/12/3
Purpose: Heat loss plays very important role in CNC systems, especially in suspension systems with permanent load
that are usually used for testing, detection and automatic cutting, the adjusting of ...
The new study has been carried out by Joe Howard and colleagues at the Max Planck Institute of Molecular Cell Biology and Genetics, along with Erik Shaeffer at the Technical University of Dresden, who...
A Full Adaptive Observer for DC Servo Motors
DC servo motors adaptive observers DC motor drives
2009/7/28
An adaptive observer estimating all parameters and load torque is proposed for DC servo motors. The observer uses no direct feedback but the adaptation schemes use current and speed measurements. Both...
Mathematical Model of Inductive Effect on the Multi-motors Synchronization Systems
Mathematical Model Synchronous Capability Induction Motors
2010/1/15
Systems of synchronous rotation with AC machines depend on the equality of speed of two or more induction motors (mechanical or non mechanical-shaft connected) with the existence of load differences a...
Stability and bifurcation of self-synchronization of a vibratory screener excited by two eccentric motors
Vibratory screener self-synchronization differential phase equations
2010/9/27
Varieties of vibratory machines adopting the self-synchronization principle are used in industries, such as vibratory screeners, vibratory conveyors, etc. Normally, two or more exciters with eccentric...
The Impact of Hobby Rocket Motors on Atmospheric Fine Particle Zinc Concentrations
Aerosol Indicator species Positive matrix factorization Source apportionment Bias
2016/3/30
Zinc concentrations in hobby rocket exhaust aerosols were measured by ICP-MS to be
approximately 300 mg/g, revealing that hobby rocket motors emit particulate matter highly
enriched in zinc. Zinc is...
Equivalent mechanical parameters of oscillating rotary motors used in transport equipment
transport equipment oscillating rotary motors mechanical system equivalent parameters
2010/11/1
In various appliances and equipment of sundry transport means there is a lot of diverse mechanisms of periodical movement. So, the various piston or membrane pumps of fuel feeding and lubrication syst...
Electric drives of traction rolling stocks with ac motors
voltage frequency power moment tractive force locomotive speed magnetic field
2010/11/2
The paper considers the variation of circuit design of the electric drives in traction rolling stocks when traditional DC electric machines are replaced with AC electric machines. Simplified circuit d...
Motors for tram drives
electric traction dc series motor dc brushless motor permanent magnets drive motors
2010/11/2
This paper compares five different motor types used in variable speed drives: a dc motor with a mechanical commutator and with electromagnetic or permanent magnets excitation, a cage induction motor, ...
OPEN-LOOP CONTROL OF A BIPOLAR STEPPER MOTORS USING THE SPECIALIZED INTEGRATED CIRCUITS
Stepper Motor Stepper Motor Controller H-Bridge Driver
2010/1/12
The paper describes the open-loop control of a stepper motors. Bipolar stepper motors can be driven with an L297, an L298N bridge driver and very few external components. With an L298N this configurat...