Rotor position measurement method for generator power angles

2011 ◽  
Author(s):  
Jie Zhou ◽  
DaoNong Zhang ◽  
YueHai Yu ◽  
JingTao Wu ◽  
Ji Zhou ◽  
...  
Keyword(s):  
Measurement Method ◽  
Position Measurement ◽  
Rotor Position

scholarly journals A New Rotor Position Measurement Method for Permanent Magnet Spherical Motors

2018 ◽  
Vol 8 (12) ◽  
pp. 2415 ◽  
Author(s):  
Yin Lu ◽  
Cungang Hu ◽  
Qunjing Wang ◽  
Yi Hong ◽  
Weixiang Shen ◽  
...  
Keyword(s):  
Permanent Magnet ◽  
High Speed ◽  
Measurement Method ◽  
Coordinate Frame ◽  
Feature Points ◽  
Position Measurement ◽  
Experimental Platform ◽  
Rotor Position ◽  
Straight Line ◽  
The World

This paper proposes a new high-precision rotor position measurement (RPM) method for permanent magnet spherical motors (PMSMs). In the proposed method, a LED light spot generation module (LSGM) was installed at the top of the rotor shaft. In the LSGM, three LEDs were arranged in a straight line with different distances between them, which were formed as three optical feature points (OFPs). The images of the three OFPs acquired by a high-speed camera were used to calculate the rotor position of PMSMs in the world coordinate frame. An experimental platform was built to verify the effectiveness of the proposed RPM method.

scholarly journals Space Vector Modulation Strategies for Self-Sensing Three-Phase Radial Active Magnetic Bearings

Actuators ◽  
2019 ◽  
Vol 8 (2) ◽  
pp. 41
Author(s):  
Dominik Wimmer ◽  
Markus Hutterer ◽  
Matthias Hofer ◽  
Manfred Schrödl
Keyword(s):  
Magnetic Bearing ◽  
Current Control ◽  
Modulation Method ◽  
Space Vector Modulation ◽  
Position Measurement ◽  
Space Vector ◽  
Position Information ◽  
Rotor Position ◽  
Three Phase ◽  
Vector Modulation

The focus of this study lies on the investigation of the space vector modulation of a self-sensing three-phase radial active magnetic bearing. The determination of the rotor position information is performed by a current slope-based inductance measurement of the actuator coils. Therefore, a special pulse width modulation sequence is applied to the actuator coils by a conventional three-phase inverter. The choice of the modulation type is not unique and provides degrees of freedom for different modulation patterns, which are described in this work. For a self-sensing operation of the bearing, certain constraints of the space vector modulation must be considered. The approach of a variable space vector modulation is investigated to ensure sufficient dynamic in the current control as well as the suitability for a self-sensing operation with an accurate rotor position acquisition. Therefore, different space vector modulation strategies are considered in theory as well as proven in experiments on a radial magnetic bearing prototype. Finally, the performance of the self-sensing space vector modulation method is verified by an external position measurement system.

Image position measurement method of the fish-eye camera using identification marker

2017 ◽  
Vol 2017 (0) ◽  
pp. 1P2-K02
Author(s):  
Naoya HATAKEYAMA ◽  
Tohru SASAKI ◽  
Kenichi KUROSAWA ◽  
Masahiro FUNATO ◽  
Mitsuru JINDAI
Keyword(s):  
Measurement Method ◽  
Position Measurement ◽  
Image Position ◽  
Fish Eye

scholarly journals On-machine Measurement and Uncertainty Analysis for Semicircular Narrow Neck Thickness based on Ultra-precision Machine Tool

2021 ◽  
Author(s):  
Xin Jin ◽  
Ruilin Gao ◽  
Chaojiang Li ◽  
Zhong peng Zheng ◽  
zhen Zuo
Keyword(s):  
Measurement Method ◽  
Dimensional Accuracy ◽  
Position Measurement ◽  
Measuring Device ◽  
Flexible Joint ◽  
Accuracy Requirement ◽  
Narrow Neck ◽  
Precision Machine ◽  
Measuring Accuracy ◽  
Ultra Precision

Abstract As flexible joint is a typical low-rigidity micro part, which have four narrow neck structures evenly distributed around its central axis, it is necessary to strictly control the dimensional accuracy of the narrow necks to improve the consistency of stiffness. However, the radius of the arc of the narrow necks is less than 2mm, and the thickness of thinnest part of the necks formed by two adjacent arcs is only tens of microns, which also has sub-micron accuracy requirement. These cross-scale dimensional characteristics and accuracy requirements give rise to extremely difficulty on the measuring process. In this paper, an on-machine measurement method for the semicircular narrow necks was presented and a measuring device was developed based on the comparative principle by making full use of the high linearity characteristic in the small measuring range of the sensor probes. Meanwhile, the on-machine measurement process based on ultra-precision machine tools was also introduced in details. The experiments results show that the uncertainty of the measurement method proposed is less than 0.2µm, and the repeatability is less than 0.1μm, which meet the measuring requirement of flexible joint. Furthermore, the effect of probe position, measurement force, environmental factor and the accuracy of the sensor on total measuring accuracy was analyzed, which could provide further evidences to improve the measuring accuracy. of micro-scale hybrid surface texture.

Position and Posture Measurement Method of the Omnidirectional Camera Using Identification Markers

2018 ◽  
Vol 30 (3) ◽  
pp. 354-362 ◽  
Author(s):  
Naoya Hatakeyama ◽  
◽  
Tohru Sasaki ◽  
Kenji Terabayashi ◽  
Masahiro Funato ◽  
...  
Keyword(s):  
Measurement Method ◽  
Position Control ◽  
Three Dimensional ◽  
Position Estimation ◽  
Position Measurement ◽  
Omnidirectional Camera ◽  
Camera Systems ◽  
Dimensional Measurements ◽  
Aerial Vehicle ◽  
Image Position

Recently, many studies on unmanned aerial vehicle (UAVs) that perform position control using camera images have been conducted. The measurements of the surrounding environment and position of the mobile robot are important in controlling the UAV. The distance and direction of the optical ray to the object can be obtained from the diameter and coordinates in the image. In these studies, various camera systems using plane cameras, fisheye cameras, or omnidirectional cameras are used. Because these camera systems have different geometrical optics, one simple image position measurement method cannot yield the position and posture. Therefore, we propose a new method that measures the position from the size of three-dimensional landmarks using omnidirectional cameras. Three-dimensional measurements are performed by these omnidirectional cameras using the distance and direction to the object. This method can measure three-dimensional positions from the direction and distance of the ray; therefore, if the optical path such as the reflection or refraction is known, it can perform measurements using a different optical system’s camera. In this study, we construct a method to obtain the relative position and relative posture necessary for the self-position estimation based on an object with an omnidirectional camera; further, we verify this method by experiment.

Sign in / Sign up

Export Citation Format

Share Document