Improved Calculation Method for Inductance Value of the Air-Gap Inductor

2020 ◽  
Author(s):  
Xinsheng Zhang ◽  
Fei Xiao ◽  
Ruitian Wang ◽  
Xuexin Fan ◽  
Haichao Wang
Keyword(s):  
Calculation Method ◽  
Air Gap

scholarly journals Sensitivity of Axial Velocity at the Air Gap Entrance to Flow Rate Distribution at Stator Radial Ventilation Ducts of Air-Cooled Turbo-Generator with Single-Channel Ventilation

Energies ◽  
2019 ◽  
Vol 12 (18) ◽  
pp. 3442
Author(s):  
Yong Li ◽  
Weili Li ◽  
Ying Su
Keyword(s):  
Flow Velocity ◽  
Calculation Method ◽  
Air Gap ◽  
Test Method ◽  
Distribution Law ◽  
Stator Core ◽  
Flow Phenomenon ◽  
Turbo Generator ◽  
Ventilation Ducts ◽  
Ventilation Duct

In the design and calculation of a 330 MW water-water-air cooling turbo-generator, it was found that the flow direction of the fluid in the local stator radial ventilation duct is opposite to the design direction. In order to study what physical quantities are associated with the formation of this unusual fluid flow phenomenon, in this paper, a 100 MW air-cooled turbo-generator with the same ventilation structure as the abovementioned models is selected as the research object. The distribution law and pressure of the fluid in the stator radial ventilation duct and axial flow velocity at the air gap entrance are obtained by the test method. After the calculation method is proved correct by experimental results, this calculation method is used to calculate the flow velocity distribution of the outlets of multiple radial ventilation ducts at various flow velocities at air gap inlets. The relationship between the flow distribution law of the stator ventilation ducts and the inlet velocity of the air gap is studied. The phenomenon of backflow of fluid in the radial ventilation duct of the stator is found, and then the influence of backflow on the temperature distribution of stator core and winding is studied. It is found that the flow phenomenon can cause local overheating of the stator core.

Calculation of Radial Active Magnetic Bearing Electromagnetic Force under Eccentric Rotor

2012 ◽  
Vol 443-444 ◽  
pp. 649-654
Author(s):  
Xiao Jing Liu ◽  
Ye Fa Hu
Keyword(s):  
Calculation Method ◽  
Electromagnetic Force ◽  
Influence Factors ◽  
Magnetic Bearing ◽  
Air Gap ◽  
Active Magnetic Bearing ◽  
Integrative Approach ◽  
Eccentric Rotor

As for active magnetic bearing, ordinary electromagnetic force formula based on air gap well-distributed. However, radial active magnetic bearing always face the situation that the rotor is eccentric and the air gap doesn’t well-distributed. This paper gives the calculation method of the electromagnetic force at that situation through calculating the air gap and using integrative approach. Then analysis the influence factors---eccentric rotor distance from center and eccentric angle to electromagnetic force. The result can provide the basis for suspension characteristic of active magnetic bearing.

Research on Characteristic of Electromagnetic Force of Magnetic Suspension Device with Large Air-Gap

2013 ◽  
Vol 401-403 ◽  
pp. 239-244
Author(s):  
Xiao Guang Wang ◽  
Qian Liu ◽  
Yi Jing Zhang ◽  
Hao Hui Chen
Keyword(s):  
Calculation Method ◽  
Electromagnetic Force ◽  
Magnetic Circuit ◽  
Characteristic Parameter ◽  
Error Distribution ◽  
Air Gap ◽  
Magnetic Suspension ◽  
Regular Pattern ◽  
Causes Of Errors

The electromagnetic force is an important characteristic parameter for magnetic suspension device, and magnetic circuit method is often used to calculate the electromagnetic force in engineering. However, it is not accurate to use magnetic circuit method to calculate electromagnetic force for magnetic suspension devices with large air-gap. In this paper three kinds of methods are used to study on the characteristic of electromagnetic force of magnetic suspension device with large air-gap: experimental, ANSYS calculation and magnetic circuit calculation method. Investigate the property and the variation regular pattern of electromagnetic force. Analyze the error distribution of magnetic circuit calculation method and find out the causes of errors, and then deduce a modified magnetic circuit formula to calculate the electromagnetic force of magnetic suspension device with large air-gap.

Cogging torque optimization and analysis of hybrid stator permanent magnet motor

2020 ◽  
pp. 1-17
Author(s):  
Shouxu Song ◽  
Mengcheng Hu ◽  
Yan Xia
Keyword(s):  
Amorphous Alloy ◽  
Calculation Method ◽  
Simulation Analysis ◽  
Analytical Formula ◽  
Torque Ripple ◽  
Silicon Steel ◽  
Air Gap ◽  
Two Dimensional ◽  
Cogging Torque ◽  
Dimensional Simulation

In order to optimize and analyze the cogging torque of hybrid stator motor, a hybrid stator motor is taken as the research project. The axial distribution of air gap magnetic flux density was analyzed, and the analytical formula of the cogging torque of the hybrid stator motor was derived. Combined with the cogging torque analytical formula, the superposition calculation method of cogging torque of hybrid stator motor was proposed, and the correctness of the superposition calculation method was verified by simulation analysis. The silicon steel segment and the amorphous alloy segment of hybrid stator core were optimized by using the uneven air gap structure, and the optimized results of the silicon steel segment and the amorphous alloy segment were obtained by two-dimensional simulation. Based on the results of two-dimensional simulation analysis, a three-dimensional model was built for simulation analysis. After optimization, the cogging torque of the motor was weakened by 48.1% and the torque ripple was reduced by 1.32%, while the loss and output torque remained basically unchanged.

Back-Calculation Method of Subgrade Modulus Based on Traffic Speed Deflectometer

CICTP 2020 ◽  
2020 ◽  
Author(s):  
Guoshuai Zang ◽  
Haizhu Lu ◽  
Guanglai Jin ◽  
Zhixiang Zhang
Keyword(s):  
Calculation Method ◽  
Back Calculation ◽  
Subgrade Modulus ◽  
Traffic Speed
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