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Transverse Flux Permanent Magnet Motor (TFPM) was first introduced in the 1980's, it has a great potentiality in direct drive area for its low-speed-high-torque capability and high torque density. However, the larger cogging torque and flux leakage have restricted its popularization and practical utilization.
As a renewable, clean energy, wind energy has attract more and more attention. It has become a common understanding of the world to vigorously develop wind energy. In order to guarantee the safety and reliability for wind power integration operation, it is of great significance to establish an appropriate wind power generator system model and analyze its electromagnetic transient characteristics....
High efficiency motors play a key role in energy conservation around the world. Understanding the efficiency requirements of IEC and NEMA is crucial in both producing and purchasing the right type of electric motors to meet various efficiency requirements. In addition to the efficiency values, understanding the tolerances that are associated with these efficiencies is important as well. As shown in...
There has been an increased usage of adjustable frequency drives (AFD) coupled with induction motors due to the demand for higher operating efficiency levels. Due to the starting requirements, motor manufacturers are forced to employ high resistivity rotor bars which lead to higher losses and lower motor efficiency. This paper will show that AFD offer the advantage of decreasing the energy consumption...
The rotor of an induction motor is designed to provide adequate starting torque and limit starting current when the load is being accelerated by the motor. These starting requirements on the rotor force design engineers to employ special shape rotor bars, or high resistance bars and thereby reduce motor efficiency and increase motor temperature rise. In addition to the benefits provided by an adjustable...
With rapid development of wind power technologies and significant growth of wind power capacity installed worldwide, various wind turbine concepts have been developed. The wind energy conversion system is demanded to be more cost-competitive, so that comparisons of different wind generator systems are necessary. An overview of different wind generator systems and their comparisons are presented. First,...
This paper explores the possibility of using normal form method for transient stability analysis of grid-connected squirrel cage induction generators (SCIG) considering with rotor electrical transients. The theory of nonlinear dynamic system for power system stability boundary approximation is introduced briefly. The third-order state equations of SCIG equivalent to a synchronous generator with the...
This paper focuses on the development of maximum wind power extraction strategies for variable speed constant frequency (VSCF) grid-connected wind power generation systems with a doubly fed induction generator (DFIG). A new optimal control method is proposed by controlling the generator stator active and reactive power, which is based on the condition of the system operation for not only the extracted...
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