Induction Motor Diagnostics and Advanced Control: Theory and Experiments

感应电动机由于其可靠性、坚固性和相对较低的成本而在工业中得到了相当大的应用。 由于没有机械换向，也不会产生火花，感应电动机在不稳定的环境中得到了广泛的应用。 尽管有这些优点，感应电动机提出了具有挑战性的问题，在检测，诊断和隔离电机故障和控制的电机。根据以前的研究，已经检查了感应电动机的可靠性及其相关的故障模式，三个最可能的故障是：机械故障的转子轴轴承，短路的定子绕组，转子条故障。 目前，有一个显着的需求，可以实时监测，感应电机的健康检测和诊断算法的发展。建模问题的感应电机与饱和磁路一直是一个重要的课题。 众所周知，线性磁路电机模型不能捕获真实的电机的所有动态特性，特别是交叉饱和效应。 虽然饱和建模已被用于预测电机的瞬态行为，大多数以前的控制工作不考虑饱和对电机性能的影响。 在控制器综合中，通常通过在要调节的输出中包括磁通量来证明磁路线性的常见假设。 在电机瞬变期间，通量幅值可能超过这些饱和极限，并且电机的性能可能严重受损。 而且在许多可变扭矩应用中，在磁饱和区工作，以使电机产生更高的转矩是可取的。该建议概述了一个研究计划，重点是开发和评估（模拟和实验）算法，用于检测和诊断最常见类型的电机故障，并在各种电机运行条件下设计先进的控制算法（例如，磁饱和和致动器饱和）和应用。

Induction motors have found considerable applications in industry due to their reliability, ruggedness and relatively low cost. Because there is no mechanical commutation and no sparks are produced, induction motors have found broad applications in volatile environments. In spite of these advantages, the induction motor presents challenging problems in the detection, diagnosis and isolation of motor faults and the control of the electrical machine.According to previous studies which have examined the reliability of induction motors and their associated failure modes, the three most probable failures are: mechanical failures in the rotor shaft bearings, short circuits in the stator windings, and rotor bar failures. There is currently a significant need for the development of detection and diagnosis algorithms that can monitor, in real-time, the health of an induction motor.The problem of modeling induction motors with a saturating magnetic circuit has always been an important subject. It is well recognized that a linear magnetic circuit machine model does not capture all the dynamics of a real machine, especially the cross-saturation effects. Although saturation modeling has been used for predicting the transient behavior of the motor, most of the previous work on control does not consider the effects of saturation on motor performance. In controller synthesis, the common assumption of the linearity of the magnetic circuit is often justified by including the flux magnitude in the outputs to be regulated. During machine transients the flux magnitude can exceed these saturation limits and the performance of the machine can be seriously compromised. Also in many variable torque applications, it is desirable to operate in the magnetic saturation region to allow the machine to develop higher torque.This proposal outlines a research program focusing on the development and evaluation (simulation and experimental) of algorithms for the detection and diagnosis of the most common types of motor faults and for the design of advanced control algorithms under a wide variety of motor operating conditions (e.g. magnetic and actuator saturation) and applications.