Current spectrum analysis is a proven technique for fault diagnosis in electrical machines. Current spectral estimation is usually performed using classical techniques such as periodogram (FFT) or its extensions. However, these techniques have several drawbacks since their frequency resolution is limited and additional post-processing algorithms are required to extract a relevant fault detectio...

In this paper some sensorless strategies for induction motor drives are reviewed and analyzed. A method for accurately obtaining the PWM stator voltage is used to minimize the problem of estimating stator flux from the stator voltage equation in low speeds. A Gopinath style stator flux observer is presented and its capability to compensate for stator voltage errors is discussed.

The concept of programmable cascaded low-pass filter method of flux vector synthesis has been introduced in the literature [1]. In this paper, the idea will be expanded, analyzed, improved, and then applied to a stator flux oriented 100-kW electric vehicle drive. It was verified that the flux estimation works well at zero speed finite torque start-up mode and lowand high-speed field weakening r...

Steady-state analysis of a three phase induction motor can be carried out by using computer simulation software such as MATLAB. From Simulink/Power system block set (PSB) library, the induction motor model can be effectively used to simulate the effects of DC resistance, no-load and blocked rotor tests. These tests are performed on a machine to estimate the values of stator and rotor resistance...

This paper presents a new online method based on low frequency signal injection to estimate the stator resistance of Wound Rotor Synchronous Machine (WRSM). The proposed estimator provides parameter-free for estimating resistance, in which there is no need know values parameters machine model, such as and rotor inductances or flux linkage. In this method, sinusoidal current injected d axis prod...

In this paper, the design and implementation of adaptive speed controller for a sensorless synchronous reluctance motor (SynRM) drive system is proposed. A combination of well-known adaptive input-output feedback linearization (AIOFL) and adaptive backstepping (ABS) techniques are used for speed tracking control of SynRM. The AIOFL controller is capable of estimating motor two-axis inductances ...

Stator faults typically have a significant share amongst the common type of faults in industrial three-phase induction (asynchronous) motors. This paper presents a motor current signature analysis (MCSA)-based diagnostics of the stator winding short circuit fault. This type of fault happens due to the destruction of the turn insulation, and can be very detrimental causing motor shutdown. Instea...