Research on Calculation Method of Constant Voltage and Constant Frequency Starting Voltage for Permanent Magnet Motors with High Power Generation/Starting Speed Ratio

2020 ◽  
Author(s):  
Ding GaoPeng ◽  
Guo Jian
Keyword(s):  
Power Generation ◽  
Permanent Magnet ◽  
High Power ◽  
Calculation Method ◽  
Speed Ratio ◽  
Constant Voltage ◽  
Permanent Magnet Motors ◽  
Constant Frequency ◽  
Starting Speed

Vector Control of Brushless Doubly-Fed Machine for High Power Stand-Alone Power Generation

2013 ◽  
Vol 344 ◽  
pp. 199-204
Author(s):  
Kai Ji ◽  
Yue Gao ◽  
Jun Zhu ◽  
Sheng Hua Huang
Keyword(s):  
Power Generation ◽  
Vector Control ◽  
High Power ◽  
Control Strategy ◽  
Generator System ◽  
Constant Frequency ◽  
Multilevel Converters ◽  
Stator Flux ◽  
Doubly Fed ◽  
And Control

In this paper, a novel variable speed constant frequency brushless doubly-fed induction generator system using back-to-back multilevel converters for high power stand-alone power generation is described. According to control target, the unified reference-frame model is used to develop an improved forced power stator flux oriented vector control strategy. The similarities and differences between the grid-connected and stand-alone topology and control strategy are also specialty analyzed and compared. Simulation results prove the feasibility and validity of the proposed model, theoretical analysis and excellent performance of the proposed control scheme.

scholarly journals Analytical Calculation of Armature Reaction Field of the Interior Permanent Magnet Motor

Energies ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 2375 ◽  
Author(s):  
Fangwu Ma ◽  
Hongbin Yin ◽  
Lulu Wei ◽  
Liang Wu ◽  
Cansong Gu
Keyword(s):  
Magnetic Field ◽  
Permanent Magnet ◽  
Calculation Method ◽  
Acoustic Noise ◽  
Analytical Calculation ◽  
Critical Issue ◽  
Permanent Magnet Motors ◽  
Reaction Field ◽  
Armature Reaction ◽  
Interior Permanent Magnet

The energy crisis and environmental concerns worldwide have helped usher in the age of electric vehicles (EVs) and hybrid EVs (HEVs). The interior permanent magnet motors (IPMMs) are widely used in these vehicles. The analysis of the armature reaction field is the most critical issue in the study of IPMMs since it determines the characters of torque, efficiency, vibration, and the radiated acoustic noise. This paper provides a calculation method of the armature reaction magnetic field (ARMF) of an IPMM. First, the formulas of ARMF without magnetic barrier are derived. Second, the relative permeance function of an IPMM is calculated. Third, the analytical solution of the ARMF of an IPMM is derived by applying the armature reaction magnetic field with unsaturated rotor multiplied by relative permeance function. Finally, several results of comparisons between the calculation method proposed in this paper and the finite element method are presented. Based on the calculation method proposed in this paper, the magnetic barrier’s influence on the ARMF is studied. The spatial harmonic orders and time harmonic orders of the ARMF of IPMM are revealed respectively.

Variable Speed Operation of Permanent Magnet Alternator Wind Turbines Using a Single Switch Power Converter

1996 ◽  
Vol 118 (4) ◽  
pp. 235-238 ◽  
Author(s):  
G. Venkataramanan ◽  
B. Milkovska ◽  
V. Gerez ◽  
H. Nehrir
Keyword(s):  
Permanent Magnet ◽  
Power Level ◽  
Power Converter ◽  
Speed Ratio ◽  
Variable Speed ◽  
Constant Frequency ◽  
Tip Speed Ratio ◽  
Three Phase ◽  
Converter Topology ◽  
Switch Power

Advantages of operating wind turbine generators at variable speed are well known. Various approaches have been proposed to extract maximum power from the turbines by operating them at the optimum tip-speed ratio. Often, they feature a three-phase controlled rectifier d-c link followed by a three-phase inverter type of power converter topology to deliver constant frequency a-c output power from a variable speed generator coupled to the turbine. However, in stand-alone power supply applications for remote sites, where the power level is a few kW or less, this approach is economically unjustifiable. This paper presents a single switch power electronic converter to regulate the power output of a permanent magnet alternator driven turbine feeding a battery, featuring minimal additional costs suitable for low power applications. Power converter operation and a control strategy to maintain optimum tip-speed ratio are discussed in the paper. Computer simulations of the complete system verifying the proposed concepts are presented.

Performance analysis of magnetic gear with Halbach array for high power and high speed

2020 ◽  
Vol 64 (1-4) ◽  
pp. 959-967
Author(s):  
Se-Yeong Kim ◽  
Tae-Woo Lee ◽  
Yon-Do Chun ◽  
Do-Kwan Hong
Keyword(s):  
Permanent Magnet ◽  
Eddy Current ◽  
High Power ◽  
High Speed ◽  
Torque Ripple ◽  
Eddy Current Loss ◽  
Element Analysis ◽  
Current Loss ◽  
Halbach Array ◽  
Magnetic Gear

In this study, we propose a non-contact 80 kW, 60,000 rpm coaxial magnetic gear (CMG) model for high speed and high power applications. Two models with the same power but different radial and axial sizes were optimized using response surface methodology. Both models employed a Halbach array to increase torque. Also, an edge fillet was applied to the radial magnetized permanent magnet to reduce torque ripple, and an axial gap was applied to the permanent magnet with a radial gap to reduce eddy current loss. The models were analyzed using 2-D and 3-D finite element analysis. The torque, torque ripple and eddy current loss were compared in both models according to the materials used, including Sm2Co17, NdFeBs (N42SH, N48SH). Also, the structural stability of the pole piece structure was investigated by forced vibration analysis. Critical speed results from rotordynamics analysis are also presented.

Development of Interior Permanent Magnet Motors with Concentrated Windings for Reducing Magnet Eddy Current Loss

2009 ◽  
Vol 129 (11) ◽  
pp. 1022-1029 ◽  
Author(s):  
Katsumi Yamazaki ◽  
Yuji Kanou ◽  
Yu Fukushima ◽  
Shunji Ohki ◽  
Akira Nezu ◽  
...  
Keyword(s):  
Permanent Magnet ◽  
Eddy Current ◽  
Eddy Current Loss ◽  
Permanent Magnet Motors ◽  
Current Loss ◽  
Interior Permanent Magnet
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