Speed Sensor Fault Tolerant PMSM Machines: From Position-Sensorless to Sensorless Control

Abstract

New sensorless observers (i.e., from stator currents/voltages measurements), to be included into a simple observer-based sensorless control for the tracking of nondefinitely zero speed references in nonsalient-pole surface Permanent Magnet Synchronous Machines (PMSMs), are proposed. They are obtained, through a 'minimum distance' modification, from recently presented position-sensorless observers (i.e., from rotor speed and stator currents/voltages measurements). The rotor speed estimate is here directly provided by the Phase Locked Loop (PLL)-based third-order Steady-State Linear Kalman Filter (SSLKF) that has been previously used to mitigate the distortions on the estimated position. Experimental results illustrate the effectiveness of the proposed approach in a speed sensor fault-tolerant scenario.

Measurement of the PMSM Shaft Position with An Absolute Encoder

“…The MAB28 (Megatron, Munich, Germany) absolute encoder was used for experimental research, which has the following properties: Division by 2 12 (4096) was required because the MAB28 encoder has 12-bit resolution. The position1 and position2 took values from 0 to 4095.…”

“…• 60 t rpm (5) Division by 2 12 (4096) was required because the MAB28 encoder has 12-bit resolution. The position 1 and position 2 took values from 0 to 4095.…”

“…When the PMSM sensorless control is used in an electric vehicle, it sometimes causes another problem. When the motor is running in steady state and is suddenly given a large load that has reverse torque direction, a problem will arise [12][13][14]. Therefore, an original method was proposed that obtained good results when the PMSM is operating in such adverse conditions.…”

Robust Fault-Tolerant Synergetic Control for Dual Three-Phase PMSM Drives Considering Speed Sensor Fault

“…Permanent magnet synchronous machines (PMSMs) using in variable speed drives are acquired significant regard owing to their large power density. Compared with ordinary PMSMs, multiphase machines possess superior property such as smaller torque ripple, larger power rating and powerful fault tolerance [1], [2]. The dual three-phase machine drive (dual-PMSMs) as a popular multiphase machine drive, is received benefits from the collaboration of two groups of three-phase windings to vanish the torque harmonic pulsation.…”

Magnetic Functional Integrated DC Motor Drive

“…by information integration includes motor position [6]- [8], inertia [9], [10], inductance [11], [12], fault status [13]- [15] etc. It eliminates the requirement of additional sensors, thus reducing the cost and the volume.…”