PWM for Open-End Winding Drive in Fault Tolerant Mode with Minimum Infinity Norm Calculation of Modulation Signals

Winding open‐circuit fault‐tolerant operation of single DC‐link dual‐inverter fed three‐phase open‐end induction motor drive

“…Existing fault-tolerant schemes for OEIM drives describes algorithms for operation of the drive during inverter device failure [13][14][15][16]. During such fault-tolerant schemes, redundant switching arrangements are used to generate balanced three-phase voltage across motor windings.…”

“…In open-end configuration, the windings are not interconnected, but each winding is supplied at both ends through two separate inverters. In case of failure of semiconductor devices in an open-end induction motor (OEIM) drive, several modified switching techniques have been proposed to drive the machine [13][14][15][16]. In these techniques, balanced three-phase voltage is generated across motor winding by reconfiguring the open-end drive.…”

“…An important and desirable feature of modern highperformance induction motor drive is its fault-tolerant capability [1][2][3][4]. A fault in a motor drive system can be due to a fault in inverter or fault in motor [5][6][7][8][9][10][11][12][13][14][15][16]. Under a winding open-circuit fault in a three-phase standard induction motor, when only two of the motor windings distributed in space by 2π/3 electrical radian are excited in a particular manner, it is possible to develop a steady torque [9][10][11][12].…”

“…However, during winding open-circuit fault, applied voltage across the two healthy windings should be phase shifted by π/3 [9][10][11][12] (instead of the usual 2π/3) in order to generate steady state torque during starting and running of the drive. Since switching schemes proposed in [13][14][15][16] generate balanced three-phase voltages (with 2π/3 phase shift), these techniques cannot be used to drive a three-phase OEIM with π/3 phase shift during an open-circuit fault in one of its winding.…”