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首页> 外文会议>Pulp and Paper Industry Technical Conference, 2009. PPIC '09 >Simple and reliable model for the thermal protection of variable speed self-ventilated induction motor drives
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Simple and reliable model for the thermal protection of variable speed self-ventilated induction motor drives

机译：简单可靠的变速自通风感应电动机驱动器热保护模型

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摘要

Self-ventilated, variable speed, induction motors cannot be protected using standard overload relays. At reduced operating speeds, the heat loss dissipation capability is deteriorated, and the motor could be subjected to overheating, even with operating currents below the rated value. The practical solution generally employed is to oversize the motor in order to avoid overheating at reduced speeds. This paper proposes and evaluates a third-order thermal model capable of giving good temperature rise predictions for any arbitrary variable-load, variable-speed, operating cycle. Key issues addressed are the estimation of the thermal capacitances of the model, and the variation of the frame-to-ambient thermal resistance with the operating frequency (speed). Evaluation is done in an experimental TEFC induction motor fitted with thermocouples in the stator winding and frame. First, the model parameters are obtained using the identification algorithm proposed; and then, the model is used to predict the temperature rise in stator and frame during variable-speed operation.
机译：自通风，变速感应电动机无法使用标准过载继电器进行保护。在降低的运行速度下，散热能力会下降，即使工作电流低于额定值，电动机也可能会过热。通常采用的实际解决方案是加大电动机的尺寸，以避免在降低的速度下过热。本文提出并评估了一个三阶热模型，该模型能够针对任何可变负载，可变速度，运行周期给出良好的温升预测。解决的关键问题是模型热电容的估计以及框架到环境的热阻随工作频率（速度）的变化。评估是通过在定子绕组和机架中装有热电偶的实验TEFC感应电动机完成的。首先，使用提出的识别算法获得模型参数；然后，该模型用于预测变速运行过程中定子和机架的温度升高。

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