Using switching transients to exploit sensorless control information for electric machines
Using switching transients to exploit sensorless control information for electric machines
复制标题
使用开关瞬态来利用电机的无传感器控制信息
DOI：
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复制
发表时间：
2011
期刊：
影响因子：
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通讯作者：
T. Wolbank
中科院分区：
文献类型：
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作者：
P. Nussbaumer;T. Wolbank
基于模型的控制策略的感应电机通常需要一个转子速度传感器，如果工作在零基本电气频率。在此工作范围内，可以应用基于利用固有凸极的无传感器控制。为了识别这些凸极的幅度和位置，可以使用注入的高频信号或对瞬时电压阶跃的电流反应。目前的技术需要应用特定的开关模式或修改PWM（脉冲宽度调制）方案，以利用机器的响应。这导致更高的转矩和电流涟漪以及额外的噪声发射。所提出的新的测量克服了这些缺点，通过使用过采样技术，从电流信号中的开关瞬态提取所需的信息。因此，可以在不进行修改的情况下应用标准PWM，以确保准确的通量或转子位置估计。测量结果将显示和比较的标准和建议的方法。
Model-based control strategies of induction machines usually require a rotor speed sensor if operated around zero fundamental electrical frequency. Sensorless control based on the exploitation of the inherent saliencies can be applied in this operating range. To identify magnitude and position of these saliencies injected high frequency signals or the current reaction on transient voltage steps can be used. Current techniques need to apply specific switching pattern or modify the PWM (pulse width modulation) scheme to exploit the machine response. This results in a higher torque and current ripple as well as additional acoustic noise emission. The proposed new measurement overcomes these disadvantages by using oversampling techniques to extract the wanted information from the switching transients in the current signal. Therefore it is possible to apply standard PWM without modification to ensure accurate flux or rotor position estimation. Measurement results will be shown and compared for the standard and the proposed approach.