Influence of Third Harmonic Back EMF on Modeling and Remediation of Winding Short Circuit in a Multiphase PM Machine With FSCWs

Arbitrary Power Sharing Among Three-Phase Winding Sets of Multiphase Machines

“…Dash above d-q current in the second equation indicates complex conjugate. The first equation of (10) and (11) sets the constraint that the sum of the current sharing coefficients k1,2,3 should always be equal to three. If this is respected, the first equations of (10) and (11) can be omitted from further analysis.…”

“…The power of multi-MW wind turbines has reached 8 MW [2][3][4]. Although the majority of WECS use three-phase machines [4], there is a growing interest in using multiphase machines [5][6][7][8][9][10]. When compared to the three-phase equivalents, multiphase machines have lower current/power per phase, lower torque ripple and above all are inherently fault tolerant [11][12][13].…”

“…While an asymmetrical six-phase machine topology is still widely considered in recent works [7,8,10,26,27,33], there has been a substantial increase in the interest in the solutions with three [5,9,19,22,25,34] and to a somewhat lesser extent four [9,[30][31][32] three-phase windings in the last ten years. Hence, power sharing between winding sets is developed first here for an asymmetrical nine-phase machine.…”

On-Line Detection of Coil Inter-Turn Short Circuit Faults in Dual-Redundancy Permanent Magnet Synchronous Motors

“…Assuming that the first set of three-phase windings is normal, and the ISCF occurs in coil 12 of the C2 phase winding which belongs to the second set of three-phase windings in the DRPMSM, the voltage equations of the first set of normal three-phase windings remain unchanged and can be expressed as Equation (8). Thus, the following discussions only focus on the second set of three-phase windings.…”

“…The common faults of motors are winding insulation faults [8][9][10], among which the ISCF in stator coil is more common and can seriously affect the normal operation of motors [11,12]. Therefore, it is significant to detect the ISCF [13,14] and the set of faulty windings in the DRPMSM online.…”