Stabilization Control in Low-speed Region in Speed Sensorless Vector Control

在感应电机无速度传感器矢量控制中，不可避免地会在低速区域产生不稳定现象。本研究的目的就是要从根本上克服这种不稳定现象，利用磁通传感器，首先对一台2.2kw、4极的通用异步电机进行了实验研究，以明确异步电机的磁轭磁通特性。在该感应电动机的磁轭上制作了直径为5mm、深度为15mm的磁通量检测孔。用零磁场式磁通传感器检测了该孔内的磁通量。首先，当磁通量传感器的位置改变时，测量轭中的磁通量的大小。结果，已经理解的是，磁通量的大小在分开时以双曲线函数从感应电动机的定子槽衰减。此外，一些三次谐波残留在感应电机的磁通检测。然而，它已被澄清，感应电动机的磁通检测是非常可能的，通过本研究的方法，我们提出了一种新的控制方法，这是一个速度传感器与上述磁通传感器的矢量控制。计算机仿真验证了该控制方法的有效性。结果表明，该控制方法克服了低速区的不稳定现象。

In the speed sensorless vector control of induction motor, an unstable phenomenon is inevitably generated in a low-speed region. The purpose of this research is to conquer this unstable phenomenon fundamentally by using the magnetic flux sensor.First of all, we experimented with a general-purpose induction motor (2.2kw, 4poles) to clarify the characteristic of the yoke magnetic flux of the induction motor. The hole for the magnetic flux detection of 5mm in the diameter 15 mm in depth was made in the yoke of this induction motor. The magnetic flux in this hole was detected by zero magnetic field type magnetic flux sensor.The following thing was clarified. First of all, when the position of the magnetic flux sensor was changed, the magnitude of magnetic flux in the yoke was measured. As a result, it has been understood that the magnitude of the magnetic flux attenuates from the stator slot of the induction motors in the hyperbola function while parting. Moreover, some third harmonic remains in the magnetic flux detection of the induction motors. However, it has been clarified that the magnetic flux detection of the induction motors is very possible by the method of this research.We proposed a new control method, which is a speed sensorless vector control with the magnetic flux sensors mentioned above. The effectiveness of this control method was verified by computer simulation. As a result, the unstable phenomenon in a low-speed area was overcome by this control method.