Modeling and Detection of Phase Current Sensor Gain Faults in PMSM Drives

Abstract

The fault of current sensors in AC electric drives can cause inaccurate tracking of the control reference and torque oscillations, that can lead to damage of mechanical components. Therefore, the development of accurate detection techniques of these faults plays a crucial role for the proper management of the electric drive and for the fault isolation and estimation. In the paper, a model-based method for the detection of phase current sensor gain faults in a Permanent Magnet Synchronous Motor (PMSM) drive with Field Oriented Control (FOC) is proposed. At first, a mathematical model is presented, which allows an accurate determination of the analytical closed-form expression of the steady-state stator currents, taking into account the effects both of the current control regulators and of any current sensors gain faults. Starting from this model, a low-computation algorithm has been carried out, which allows not only to detect and isolate the current sensors affected by the gain fault, but also to estimate the gain values starting from the measured phase currents and motor speed. The model and the diagnostic algorithm performance is verified by means of numerical and experimental results.INDEX TERMS Current sensor fault, PMSM drives, Fault diagnosis.

Current Signature Modeling of Surface-Mounted PMSM Drives With Current Sensors Faults

“…In this paper, both types of faults are considered to be present simultaneously. Because of the non-linearity of the considered system, the principle of superposition of effects is not applicable, and therefore the structure of the model and the solutions obtained in this paper are significantly different from the ones presented in [22], [23].…”

“…Thus, the steadystate solution has the form From ( 13), ( 14) and (17), it is possible to deduce that, when a fault of one or more current sensors occurs, the steadystate i d and i q are given by the sum of a series of harmonics having angular frequency hpω r , with h integer. In particular, if only a gain fault occurs, only the harmonics corresponding to even values of h are present [23], while if only an offset fault occurs there are only the harmonics corresponding to odd values of h [22]. The coefficients a d,h , b d,h , a q,h , b q,h , c d , c q are functions of motor parameters, motor speed, gains of the control loops, gains and offsets of the phase current sensors.…”

“…Third, a sensitivity analysis of the proposed solution to the variations of the motor parameters is conducted in detail. The authors had already addressed the problem of modeling the current signature due to current sensor failures in PMSM drives by considering separately offset [22] and gain failures [23], respectively. In this paper, both types of faults are considered to be present simultaneously.…”

Hybrid Dynamical Modeling and Control of Permanent Magnet Synchronous Motors: Hardware-in-the-Loop Verification

“…The dynamic of the PMSM, which is considered to be the main driver of the EV, is derived before going through the specifics of the control system that is proposed. There are two frames used to derive the dynamic model of the PMSM: the stationary reference frame [39] and the synchronous reference frame [40,41]. Considering the complexities and time-variance of the stationary reference frame, we use the dq-axis synchronous reference frame, in which the voltage and current variables are constant values.…”

Working State of Diesel Engine Cylinder Based on Continuous Wavelet Transform Algorithm

“…The time domain characteristics of diesel engine cylinder head vibration signal refer to the vibration of diesel engine at different working hours. It can be seen from the structure of the diesel engine that the valve train is in the cylinder head, and the vibration of the valve train will be directly transmitted to the cylinder head surface [13][14].…”