دانلود رایگان مقاله الزویر درباره محاسبه ظرفيت القاگرى ماشین AC بر اساس تئوری تابع سيم پيچى (کلیک کنید)
توضیحات :
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مشخصات مقاله محاسبه ظرفيت القاگرى ماشین AC :
عنوان مقاله :
Direct computation of ac machine inductances based on winding function theory
ترجمه فارسی عنوان :
محاسبه مستقیم ظرفيت القاگرى ماشین AC بر اساس تئوری تابع سيم پيچى
سال انتشار : 2009
متعلق به مجله یا ژورنال : مدیریت و تبدیل انرژی (Energy Conversion and Management)
فرمت: PDF
تعداد صفحات: 4
شماره پروژه: 5001
کلمات کلیدی مقاله محاسبه ظرفيت القاگرى ماشین AC :
Winding function, Inductances, Ac machines, Slots, Inverse airgap function, Synchronous, reluctance machine
تابع سیم پیچی، القاگرى، ماشین آلات AC، شکافها، تابع هواشکاف معکوس، همزمان، مقاومت مغناطيسى ماشین
چکیده :
Abstract
A numerical procedure for computing the inductances of ac machines is described. The procedure does not require that explicit expressions for airgap or winding functions be obtained therefore complicated integrations are avoided. The effects of stator slots are included in a manner in which all the harmonics are taken into account. The inductances obtained are subsequently transformed to d-q-0 reference frame and the results are seen to compare favorably with measurements. Significant differences exist in the computed inductances especially in the d-axis. Cross-coupling effects between the d-axis and q-axis inductances which are generally ignored when approximate expressions are used are also observed.
مقدمه مقاله محاسبه ظرفيت القاگرى ماشین AC :
Introduction
The winding function (WF) theory developed in the early 1950s is a veritable tool for calculation of ac machine inductances [1,2]. The finite element (FE) method [3] though more accurate is cumbersome because it requires an extensive characterization of the machine studied, for example, the physical geometry, instantaneous winding current distribution, electromagnetic properties of all the materials making up the machine and an advanced knowledge of electromagnetic fields. Additionally, several boundary conditions must be specified before the model calculations can be performed. In this paper, it is shown that the WF method can by very simple numerical procedure, yield very accurate results even though the only information required are the winding layout and machine geometry. However, if more machine parameters other than inductances are required, FE may be a better option.
In traditional WF procedures, only the fundamental components of winding functions and only the average plus the second harmonic component of the inverse airgap functions are used. The expressions are so truncated because the known WF formula for calculating inductances requires that explicit expressions for the winding pattern and inverse gap function be obtained. These, coupled with the assumptions that the windings are placed in the periphery of the airgap whereas they are in slots, reduces the accuracy of the computed results. Even with such simplifications, the integrations to be performed can be challenging. After these, the inductance expressions so obtained in the a–b–c frame will be easy to transform to d-q-0 frame. However, the end results in the d-q-0 frame are not required in the form of expressions and therefore, the intermediate expressions obtained for the inductances in the a–b–c frame are not so useful.
توجه :
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