Rotor steady-state current distribution of double squirrel cage motor considering skin effect
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摘要: 为了在计及趋肤效应情况下有效研究双鼠笼电动机转子稳态电流分布情况，对独立端环型和共端环型双鼠笼电动机转子支路进行了等效变换，利用分层法对上下笼导条支路进行分层处理，得到了在计及趋肤效应情况下同时适用于计算独立端环型和共端环型双鼠笼电动机转子稳态电流分布的方法。算例分析结果表明，独立端环型和共端环型双鼠笼电动机转子上下笼电流分布基本一致，频率越高的电流在上笼中的分布较下笼越密集；工频供电下，电动机正常运行时，独立端环型和共端环型双鼠笼电动机转子基频电流分布基本一致；工频供电下，电动机堵转时，共端环型双鼠笼电动机趋肤效应比独立端环型双鼠笼电动机更明显；相同电流频率下，共端环型双鼠笼电动机上下笼电流比值较独立端环型双鼠笼电动机大。Abstract: In order to effectively research rotor steady-state current distribution of double squirrel cage motor in case of skin effect, equivalent transformation of rotor branch of independent end-ring type and common end-ring type double squirrel cage motor were carried out, layering method was used to deal with upper and lower bar branches, and method for calculating rotor steady-state current distribution of independent end-ring type and common end-ring type double squirrel cage motor in case of skin effect was presented. The analysis results show that current distribution of rotor upper and lower cage of independent end-ring type and common end-ring type double squirrel cage motor is basically the same, the higher the frequency, the more dense the current is distributed in upper cage than that in lower cage; under power frequency supply, rotor basic frequency current distribution of independent end-ring type and common end-ring type double squirrel cage motor is basically the same when the motor is running normally, and skin effect of common end-ring type double squirrel cage motor is more obvious than that of independent end-ring type double squirrel cage motor when the motor is short-circuit running; current ratio of upper and lower cage of common end-ring type double squirrel cage motor is larger than that of independent end-ring type double squirrel cage motor at the same current frequency.
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