国际工程承包中的企业索赔管理-建筑经济 关键词] 国际工程；索赔；波纹理论；权变管理 [gap=311]Key words: international project; claim; ripple theory; contingency management
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The Ripple Theory 波纹理论
The cause of producing the commutation torque ripple was mainly found by means of analyzing the commutation process of permanent magnet brushless DC motor in theory.
主要对永磁无刷直流电动机换相过程进行理论分析，得到引起换相转矩脉动的原因。
By using transmission line theory and linear approximation of the circuit, analytical expressions are derived for the ripple due to asymmetry of input voltages and circuit elements.
采用传输线理论，在线性近似条件下推导出起因于输入电压的非对称和电路元器件非对称的纹波的解析表达式。
Then a torque and flux regulator based sliding-mode control theory was designed to reduce the torque ripple in conventional DTC system.
并且基于滑模控制理论设计了滑模转矩和磁链调节器。
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