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The Study on Electromagnetism Construction Analysis and Simulation of Brushless Double-Fed Machine

Author: ChengJianFei
Tutor: MeLi
School: Tianjin University
Course: Motor and electrical
Keywords: BDFM Parameter calculation Steady-state performance analysis Electromagnetic analysis Cross - coordinate model Characteristics Simulation
CLC: TM34
Type: Master's thesis
Year: 2006
Downloads: 419
Quote: 2
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Abstract


BDFM simple structure and firm capacity of the speed control device, can achieve asynchronous, synchronous and doubly fed multiple operating modes. As VVVF motor used in electrical transmission system can reduce the inverter capacity and speed control costs, has a good prospect of application in energy-saving speed of the fan and pump loads as well as hydro, wind power generation, brushless doubly-fed machine attention by researchers. The BDFM study mainly carried out several aspects of the research work. First, the research status and prospects of the understanding of the history of the development of the motor brushless doubly-fed, combined with domestic and foreign literature, on the the BDFM basis of theoretical study. Analyzed from the view point of power the VVVF principle of BDFM speed formula and the stator windings of the BDFM power winding and control winding electromagnetic power and power frequency. Second, the structure of BDFM. Such stator power winding and control winding two windings, two windings in the form of a single winding and winding, and both windings, each of the characteristics to be analyzed, especially special single winding structure profiling; the form of a squirrel-cage rotor winding, guide the selection of the number of comprehensive analysis, which provides a theoretical basis for the BDFM design and parameter optimization. Again, as mentioned above, due to the special structure of brushless doubly-fed motor stator, making no direct electromagnetic coupling the two windings of the stator, but indirectly through the rotor electromagnetic power transfer, the steady-state performance analysis The traditional motor has a greater difference. By the commutation frequency of the three-winding current frequency of unified power winding frequency to obtain the equivalent circuit and phasor diagram motor in steady-state operation, and further analysis of the steady-state electromagnetic torque and power relations of the motor characteristics. After BDFM magnetic field distribution the harmonic and interaction analysis and research. Finally, to improve existing mathematical model, proposed a brushless doubly-fed motor cross coordinate mathematical model and its simulation study. The model stator power and rotor windings transform stationary coordinate system dq0 system still abc three-phase stator control winding Therefore, when the control winding and inverter connections, the interface variables directly with frequency converter and its relevant equation simultaneous solution without having to go through the coordinate transformation. After simulation study using Matlab / Simulink software model, results ideal to verify the correctness of the model.

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CLC: > Industrial Technology > Electrotechnical > Motor > AC motor
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