Results 11 to 20 of about 27,886 (209)

Model-based aberration corrected microscopy inside a glass tube. [PDF]

J Microsc
Abstract Microscope objectives achieve near diffraction‐limited performance only when used under the conditions they are designed for. In nonstandard geometries, such as thick cover slips or curved surfaces, severe aberrations arise, inevitably impairing high‐resolution imaging.
Cox DWS, Knop T, Vellekoop IM.
europepmc   +2 more sources

A review of sensorless control methods for AC motor drives

CES Transactions on Electrical Machines and Systems, 2018
In recent years, the application of sensorless AC motor drives is expanding in areas ranging from industrial applications to household electrical appliances.
Dianguo Xu, Bo Wang, Guoqiang Zhang, Gaolin Wang, Yong Yu   +4 more
doaj   +1 more source

Improved rotor position estimation in extended back-EMF based sensorless PM brushless AC drives with magnetic saliency [PDF]

, 2007
An improved extended back-EMF based sensorless control method is proposed for a brushless AC motor equipped with an interior permanent magnet rotor. It accounts for dq-axis cross-coupling magnetic saturation by introducing an apparent mutual winding ...
Bingham, Chris, Howe, D, Li, Y, Zhu, Z Q
core   +1 more source

An Online Position Error Correction Method for Sensorless Control of Permanent Magnet Synchronous Machine With Parameter Mismatch

IEEE Access, 2021
To eliminate the influence of parameter mismatch for fundamental model based sensorless methods, an effective online position error correction method is proposed for permanent magnet synchronous machines in this paper. Based on the derived position error
T. Y. Liu, Z. Q. Zhu, B. Shuang, Z. Y. Wu, David A. Stone, Martin P. Foster   +5 more
doaj   +1 more source

Improved rotor position estimation by signal injection in brushless AC motors, accounting for cross-coupling magnetic saturation [PDF]

, 2007
The paper presents an improved signal injection- based sensorless control method for permanent magnet brushless AC (BLAC) motors, accounting for the influence of cross-coupling magnetic saturation between the d- and q-axes.
Bingham, Chris, Howe, D, Li, Y, Stone, D, Zhu, Z Q   +4 more
core   +1 more source

Position estimation delays in signal injection-based sensorless PMSM drives [PDF]

, 2012
The causes of position estimation delays and their effects on the sensorless control of permanent magnet synchronous motor drives are investigated. The position of a permanent magnet synchronous machine is estimated via the injection of high frequency ...
Altomare, A., Cupertino, F., Guagnano, A., Pellegrino, Gian-Mario Luigi   +3 more
core   +1 more source

FPGA-based implementation of the back-EMF symmetric-threshold-tracking sensorless commutation method for brushless DC-machines [PDF]

, 2013
The operation of brushless DC permanent-magnet machines requires information of the rotor position to steer the semiconductor switches of the power-supply module which is commonly referred to as Brushless Commutation. Different sensorless techniques have
Darba, Araz, De Belie, Frederik, Melkebeek, Jan, Salem Mohamed Salem, Aboubakr   +3 more
core   +1 more source

Sensorless sensing with WiFi [PDF]

Tsinghua Science and Technology, 2015
Can WiFi signals be used for sensing purpose? The growing PHY layer capabilities of WiFi has made it possible to reuse WiFi signals for both communication and sensing. Sensing via WiFi would enable remote sensing without wearable sensors, simultaneous perception and data transmission without extra communication infrastructure, and contactless sensing ...
ZHOU, Zimu, WU, Chenshu, YANG, Zheng, LIU, Yunhao   +3 more
openaire   +2 more sources

Sensorless Switched Reluctance Machine and Speed Control: A Study to Remove the Position Encoder at High Speed of Operation

Energies, 2022
High-speed electrical machines have been of great research interest because of their excellent efficiency and high storage capacity. In the case of switched reluctance machines (SRMs), position feedback is required for effective operation.
Jonathan Velasco Costa, Paulo J. C. Branco   +1 more
doaj   +1 more source

Modeling of cross-coupling magnetic saturation in signal-injection-based sensorless control of permanent-magnet brushless AC motors [PDF]

, 2007
An improved brushless AC motor model is proposed for use in signal-injection-based sensorless control schemes by accounting for cross-coupling magnetic saturation between the - and -axes.
Bingham, Chris, Howe, D, Li, Y, Zhu, Z Q
core   +1 more source