Continuous demagnetisation assessment for triple redundant nine‐phase fault‐tolerant permanent magnet machine

Selection of Optimal Magnets for Traction Motors to Prevent Demagnetization

“…Therefore, this prior-art review indicates so far that there has been no satisfactory method that can determine the knee endpoint precisely [65]. Thus, there is still a need to develop a method to precisely locate this critical point, called simply knee point k from now onwards.…”

Electromagnetic-Thermal Coupled Simulation Under Various Fault Conditions of a Triple Redundant 9-phase PMASynRM

“…Thus, fault propagation between different 3-phase sets is minimized. It has been demonstrated in [10] and [12] that the machine has excellent fault tolerant capability under many common faults, including the open-circuit, intra-phase (inter-turn SC within a phase) SC and inter-phase SC, uncontrolled rectification at high speed due to inverter failure, DC capacitor fault and demagnetization under voltage reversal fault. However, it is important to gain in-depth understanding of the thermal characteristics of this machine in fault conditions.…”

Electromagnetic and Thermal Behavior of a Triple Redundant 9-Phase PMASynRM With Insulation Deterioration Fault

“…Thus, fault propagation between different 3-phase winding sets is minimized. These together with the low permanent magnet usage largely improve the fault tolerance under many common faults [13][14]. Moreover, it has been demonstrated in [13] that the machine drive can sustain and tolerate a single turn SC fault in the leading or trailing coils of a 3-phase winding when a terminal SC through 3-phase inverter is applied on the faulted 3-phase set as the mitigation measure.…”