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Analysis of starting characteristics of cage-rotor brushless doubly-fed machine(PDF)

[ISSN:1007-449X/CN:23-1 408/TM]

Issue:
2008年05
Page:
545-549
Research Field:
Publishing date:

Info

Title:
Analysis of starting characteristics of cage-rotor brushless doubly-fed machine
Author(s):
DENG Xian-mingZHANG Hai-zhongSHI Hua-jie
College of Information & Electrical Engineering,China University of Ming and Technology
Keywords:
induction motors brushless doubly fed machines starting characteristics model simulation MATLAB/SIMULINK
PACS:
TM301.3
DOI:
-
Abstract:
The brushless doublyfed machine(BDFM) is acted upon by asynchronous torques generated by power windings and control windings in the starting process. It makes the machine’s starting course complex. The fundamental way to improve BDFM starting characteristics is to adopt the rational starting method. Based on the dq model of cagerotor BDFM in rotor speed coordinate, characteristics of BDFM under different starting methods are simulated with Matlab/Simulink. Laws of electric current variation are studied in the process of asynchronous starting, machine being pulled into synchronous by DC and being pulled into subsynchronism and supersynchronism by AC. The results show that the method of singlefed asynchronous starting is relatively simple to implement, but commotion and out of synchronization exist. The BDFM’s steady speed after asynchronous starting is mainly influenced by rotational inertia and load torque. The method of doublyfed variable frequency starting can realize smooth and steady startup, however, its control is complex.

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Memo:
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Last Update: 2008-12-12