Sensorless Direct Torque Control of Induction Motor with an Open-End Stator Winding Using an Adaptive Luenberger Observer

Stator Resistance Compensator Based on Model Reference Adaptive System Scheme for Sensor-Less Direct Torque Control of an Open End-Winding Induction Motor with First Coil Faults

“…where, , , and are the parameter values in faulty state. Figure 1, illustrates the circuit principle of the studied topology in this paper [2,4,15], where only one DC source is used to the dual inverter feeding the open-end stator winding of the induction motor. The two inverters are identified by indices 1 and 2, while the inverter 1 is connected to stator winding terminal of 1 , winding stator to connected is 2 inverter and 1 , 1 terminal of 2 , 2 and 1 .…”

“…The DTC is based on the direct determination of the sequence control used to control inverter switches to select the proper voltage vectors feeding the open-end winding-IM [16][17][18][19][20]. The DTC strategy scheme consists of the estimation block for the torque and flux, two hysteresis controllers and two switching table [4]. It is much simpler than the vector control scheme due to the absence of coordinate transformation and a position encoder [12][13][14].…”

“…In fact, in order to apply DTC technique to this studied configuration, we define two switching tables, where the first is used to control the inverter 1 and the second to control the inverter 2. The measured stator currents in α-β frame can be expressed using Clarke transformation as follows [4]:…”

“…During the last years, a dual three-phase inverters feeding OEW-IM have attracted great interest in industry for variable speed applications due to their many advantages compared to the traditional single-sided supply configurations. They have several main advantages such as each inverter works at half of the power because the motor is powered by the both sides of each winding, no need to have the motor's neutral point, each phase current can be controlled separately [1][2], and the possibility to reduce the common mode voltage [3][4]. However, despite all their previous advantages, they are subjected to electrical or mechanical faults due to various stresses during operating conditions, which can affect their lifespan [2].…”

“…An insulation breakdown between turns for the same coil produces a stator winding fault. This kind of fault is called turn to turn or ITSC [4][5][6][7][8]. This fault causes a large circulating fault current in the shorted turns of the stator winding, leading to excessive heat generation in the shorted turns [9].…”