A New External Search Coil Based Method to Detect Detailed Static Air-Gap Eccentricity Position in Non-Salient Pole Synchronous Generators

2020 ◽  
pp. 1-1
Author(s):  
Yuling He ◽  
Zhi-Jie Zhang ◽  
Wen-Qiang Tao ◽  
Xiao-Long Wang ◽  
DAvid Gerada ◽  
...  
Keyword(s):  
Air Gap ◽  
Synchronous Generators ◽  
Search Coil ◽  
Salient Pole

scholarly journals Optimal Control of the Positional Electric Drive and Its Implementation

Machines ◽  
2021 ◽  
Vol 9 (4) ◽  
pp. 70
Author(s):  
Vladimir Dotsenko ◽  
Roman Prokudin ◽  
Alexander Litvinenko
Keyword(s):  
Optimal Control ◽  
Wind Turbine ◽  
Electric Drive ◽  
Minimum Energy ◽  
Air Gap ◽  
Synchronous Generators ◽  
Capacitor Discharge ◽  
Wind Speeds ◽  
Minimum Energy Consumption ◽  
Low Wind Speeds

The article deals with the optimal control of the positional electric drive of the stator element of a segment-type wind turbine. The calculation options charts current in the assumption of the minimum energy consumption and the implementation of line chart current using the phenomenon of capacitor discharge. The analysis of the implementation is expressed in a jump-like change in current and a triangular graph of the speed change. This article deals with small capacity synchronous wind turbine generators with a segment type stator. These units have the possibility of intentionally changing the air gap between the rotor and stator. This allows: (1) Reduce the starting torque on the rotor shaft, which will allow the rotor to pick up at low wind speeds. (2) Equivalent to change of air gap in this case is change of excitation of synchronous generators. Thus, the purpose of the article is to consider a method of excitation of generators in a segmented design, by controlling the gap with the electric drive, while providing control should be carried out with minimal losses.

Airgap Search Coil-Based Detection of Damper Bar Failures in Salient Pole Synchronous Motors

2019 ◽  
Vol 55 (4) ◽  
pp. 3640-3648 ◽  
Author(s):  
Jangho Yun ◽  
Sang Wook Park ◽  
Chanseung Yang ◽  
Sang Bin Lee ◽  
Jose A. Antonino-Daviu ◽  
...  
Keyword(s):  
Synchronous Motors ◽  
Search Coil ◽  
Salient Pole

scholarly journals Direct-Drive Synchronous Generators with Excitation from Strontium-Ferrite Magnets: Efficiency Improvement

2012 ◽  
Vol 49 (4) ◽  
pp. 3-13
Author(s):  
A. Serebryakov ◽  
N. Levin ◽  
A. Sokolov
Keyword(s):  
Permanent Magnets ◽  
Strontium Ferrite ◽  
Air Gap ◽  
Electric Machine ◽  
Specific Power ◽  
Hard Material ◽  
Efficiency Improvement ◽  
Direct Drive ◽  
Synchronous Generators ◽  
Starting Torque

Direct-Drive Synchronous Generators with Excitation from Strontium-Ferrite Magnets: Efficiency Improvement The authors consider the possibility to raise the specific power of synchronous generators with excitation from inexpensive permanent magnets. For this purpose, it is proposed to use tooth-wise windings and permanent magnets based on inexpensive magneto-hard material, e.g. strontium-ferrite. The magnets are to be placed between the rotor teeth, the alternate polarity of which is facing the air-gap. This provides a simpler and cheaper technology of making such a generator and improves its reliability. The proposed rational bevelling of the stator teeth not only raises the specific power of the generator but also reduces the level of noise and vibrations, extends the longevity of the magnets and bearings as well as facilitates the starting torque of the electric machine, e.g. if it is employed as wind generator.

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