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This paper presents a marine generator control system which BDFM control winding side is controlled by commercial converter. Two problems of the commercial converter in control system is solved. One is the common commercial converterpsilas output voltage and frequency at constant V/F curve, the other is it canpsilat feedback energy to AC power. Based on generator voltage and frequency loop , we discuss...
According to the torque-speed characteristic of permanent magnet double-rotor machine, the loss has been analyzed. Combining with structure and distribution of heat source of the machine and its cooling system, a lumped parameter thermal model has been formed to simulate analysis and verify thermal design for the adjustment of key design variables.
In order to investigate the impacts of the integration of wind farms into utilities network, it is necessary to analyze the transient performances of wind power generation systems. In this paper, an assessment of the impact that the different representations of drive-train dynamics have on the electrical transient performances of doubly fed induction generator (DFIG) wind turbines with different operationally...
The 3D finite element analysis (FEA) is used to establish the natural frequencies and vibration modes of the magnetic bearing-rotor system of high-speed machine and to define bearing stiffness of 3D-FEA model by exciting experiment. The critical speeds calculated by the method of FEA consistent with tested results of a high speed permanent magnet (PM). The study shows that the magnetic bearings introduce...
As a new energy transmission device, dual rotor four-quadrant transmission (4QT) simplifies power-train structure of electrical variable transmission (EVT) and makes internal combustion engine (ICE) operate in high efficiency region. Reduction of fuel consumption and the improvement of vehicle performance are achieved as well. In this paper, different operation modes of EVT are analyzed based on the...
A dual mechanical ports electric machine (DMPM) with clutch is used as an electrical variable transmission (EVT) in hybrid electric vehicle (HEV). In this paper, the working principle and advantages of this novel converter is explained. Then a method of power parameters matching design for DMPM with clutch considering the fuel economy and power performance based on driving cycle is presented and the...
An efficient condition monitoring system is indispensable to a large offshore wind turbine (WT) as it suffers higher reliability risk being exposed to extreme running environment and subject to constantly variable loadings, however difficult to access for fault repair. Today, the majority condition monitoring techniques for WT are borrowed from other industry fields where they achieve success. However,...
The paper presents a rotor suspending structure in shaft direction, which is applied to bearingless switched reluctance motor (SRM), and deduces its mathematic model. A nonlinear feedback linearization control method is developed to control SRM-rotor suspending in the shaft direction, and the systempsilas stability is analyzed. A developed prototype of bearing SRM is employed to test its rotor suspending...
The analysis and simulation of a doubly-fed induction machine used as a power flow control device is examined. This is a system that transfers power between one power system area and another using a doubly-fed induction machine as a rotary transformer containing rotor and stator windings. The ability to control the power flow by adjusting the rotor shaft angle is demonstrated. A test system was developed...
This paper gives the design and simulation of a permanent magnet synchronous motor (PMSM) for a super-high speed centrifugal compressor drive application. The PMSM has an output power of 2000 W at 200,000 rpm with 28 V dc power supply. It is designed for operation at a cryogenic temperature of 77 K. The designed PMSM is a 2-pole, 3-phase slotless structure. The permanent magnet is centrally located...
The need for nanometer resolution positioning technique draws significant attention for semi-conductor industry, biotechnology, and nanotechnology. This paper presents a design of friction-drive rotary stage driven by piezoelectric (PZT) actuator. This stage includes a multiplayer PZT actuator, Scott Russel mechanism, an actuation stage, a pre-load spring and an output shaft. The rotary positioning...
Fault diagnosis is gaining more attention for electric machines running critical loads, whose sudden breakdown can result in unpredictable revenue losses. Consequently the motor drive systems with fault diagnostic and prediction features are of great concern and are becoming almost indispensable. Among all kinds of common faults, quite a few have relationship with unequal air-gap. So far, work on...
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