Hi all,

can anyone provides me with an explanation of utilizing the small vectors of 3L-NPC inverter for both high speed and low speed operations of Direct Torque Control of Induction Motor? In case of high speed operation, the large or medium vectors used to increase the torque while the small vectors decrease the torque. However, for low speed operation, the small voltage vector will increase the torque while the zero vector will decrease it. I am wondering how can the small vector which is used to decrease the torque in high speed operation be used to increase the torque in low speed operation?

Thanks in advance

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