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The Direct-drive permanent magnet wind generator (DDPMWG)is connected to the grid through a back to back full power converter. So the design and analysis modeling based on the grid voltage of traditional synchronous generators is not suitable for DDPMWG yet. In this paper, a new design and analysis modeling for DDPMWG is proposed. Considering the strategy of the converter, this modeling can show the...
Permanent magnet brushless motors for electric vehicles are presently given an increasing attention. With this trend, this paper deals with an interior permanent magnet (IPM) brushless DC motor (BLDCM), which is supposed to apply in a two-seater pure electric car. Firstly, the performance indicators of the motor were determined according to the power requirements of the car at different driving speed,...
The direct torque control based on two PI regulator of the torque and flux and the two decoupling components of motor space voltage vector, torque and flux, was used in surface mounted permanent magnet synchronous motor. While the stator flux estimation method based on rotor position and stator current was applied. Besides, the speed identification based on model reference adaptive system (MRAS) with...
Vehicle retarders receive more and more attention along with its use growing. This paper introduces a new type of eddy current retarder with double-rotor excitation and liquid-cooled stator structure. It can be considered to consist of two retarder units combined in the radial direction. Four different double-rotor eddy current retarders were proposed, including a double electric excitation rotor,...
This paper proposes a curve analog control of maximum torque per ampere control (MTPAC) for permanent magnet synchronous motor (PMSM) used in electric vehicles. Iterative delivery and the least square method are employed to derive the d-q-axis current component and the curve simulation of the data. Then the whole curve is divided into three sections whose highest index is two. Compared to the traditional...
The fresh food logistics outsourcing quality supervision is analyzed by using the game theory. Based on different hypothesis models of one-stage game and multi-stage games are established. And the equilibrium strategy for the two parties is produced. Some key factors impact on the two parties. Some factors like the supervision cost of the fresh food enterprises and the cheat amount for the third party...
In order to adapt to the development of food enterprises, that more and more logistics operations will be outsourced by food companies increasingly. So to manage the risks become one of the most important issues. In order to control the risk of logistics outsourcing better, so that this paper analyzes food enterprises' risk of logistics outsourcing, then use the method-fuzzy evaluation to construct...
Three-dimensional glass ceramic scaffolds from the system CaO–P 2 O 5 –Na 2 O–ZnO have been prepared by coating polyurethane foams with sol–gel derived glass slurry. Main phase catena hexaphosphate (Ca 4 P 6 O 19 ), minor phases calcium pyrophosphate (β-Ca 2 P 2 O 7 ) and calcium metaphosphate (β-Ca(PO 3 ) 2 )...
Combined with risk indices of comprehensive reliability assessment and economic assessment theory, there may be trade-off between system installations cost and power interruption cost in the competitive power market environment. To coordinate reliability and economy, this paper proposed an overall framework of optimal reliability algorithm for bulk power system based on total owning cost (TOC). Interruption...
Different micellar media had different effects on the absorption spectra of the complexes of bromopyrogallol red with Sb(III) and Sb(V). The mixed micellar medium composed of 0.7 ml of 0.2% sodium dodecylsulfate (SDS) and 0.3 ml of 2% nonylphenoxypolyethoxyethanol (OP) at 80°C could be used for the sensitive determination of Sb(III) in Sb(III)/Sb(V) binary mixtures. Under the optimal conditions,...
The complex of tin(IV) with bromopyrogallol red (BPR) in the presence of nonyl phenoxy polyethoxyethanol (OP) and cetyltrimethylammonium bromide (CTAB) has a sensitive absorption peak at 304 nm. Under the optimal conditions, Beer's law is obeyed over the range 0.1-2.5 μg ml -1 Sn(IV) with molar absorptivity being 8.2 10 4 1 mol -1 cm -1 and detection...
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