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This paper proposes a semi-flooded cooling concept for a high speed machine design. The electrical machine considered is for an aircraft starter-generator system where power density and efficiency are crucial. In order to achieve the high power density permanent magnet machine, a direct oil cooling strategy for the machine stator is adopted. A stator oil sleeve is designed to separate the machine...
This paper investigates detailed aspects involved in the electrical machine topology selection for high speed automotive superchargers, through a case study involving a 48V 15kW peak application. The transient nature of the application is taken into account together with the different cooling options available to the electrical machine within the vehicle.
Currently, there is significant attention being paid to the development of high-speed machines including motors and generators. In particular, permanent magnet machines are gaining more traction due to their outstanding efficiency, high power density, small size, low weight, simple mechanical construction, easy maintenance and good reliability. The higher the motor speed, the smaller the electric...
With advantages of low emissions, fuel flexibility, high efficiency and energy saving, micro turbines (MTs) are one of the most important technologies for distributed generated systems (DGSs) [1,2]. With many advantages such as high power density, simple structure, and higher efficiency, high speed permanent magnetic generator systems (HSPGSs) attract more attentions from the world wide researchers...
As one of the most important kinds of distributed generation systems, the micro turbine generation system can be flexibly installed near the end user, and becomes an important trend of development in DGS gradually. The high speed permanent magnetic generator (HSPMG) can be properly applied in a micro turbine generation system and benefits the system from high efficiency, high power density, simple...
Electromagnetic characteristics are critical for performance evaluation of switched reluctance machine (SRM), but it's very difficult to get them due to strong nonlinearity and coupling. In this paper, the detailed magnetization and torque characteristics of SRM are obtained by finite element method (FEM) firstly, and then an analytic method (AM) is presented to calculate the characteristics. The...
This paper presents a novel wind farm laguerre function based Nonlinear Model Predictive Control (NLMPC) coordinated controller for minimizing the wind farm wake loss and optimizing the capture power. According to the NLMPC with dynamic wake model, the controller can increase the farm capture power efficiently by regulating all WTGs in the farm. In the controller, the predicted effective wind speed...
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....
This paper presents a Space-Vector Modulated (SVM) Direct-Torque-Control (DTC) scheme for a direct-drive permanent magnet synchronous generator (PMSG) and a gird converter for wind energy without any position sensor. Direct control of the rotating velocity and amplitude of the stator flux vector allows very fast torque response of the PMSG according to the generator speed. Fixed switching frequency...
For the correct operation of a field oriented control drive, parameters of the induction motor should be fully defined. To obtain the parameters a dc step voltage response method is used. A dc voltage step is applied to the stator winding and the stator current is recorded. Four samples of the latter are needed to calculate the stator resistance, the stator self-inductance, the rotor time constant,...
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