Ozturk, Salih BarisAlexander, William C.Toliyat, Hamid A.2024-05-252024-05-252010800885-89931941-010710.1109/TPEL.2009.20288882-s2.0-77249140001https://doi.org/10.1109/TPEL.2009.2028888https://hdl.handle.net/20.500.14517/687Ozturk, Salih B/0000-0001-8322-4066This paper presents a direct torque control (DTC) technique for brushless dc (BLDC) motors with non-sinusoidal back electromotive force (EMF) using a four-switch inverter in the constant torque region. This approach introduces a two-phase conduction mode as opposed to the conventional three-phase DTC drives. Unlike conventional six-step current and voltage control schemes, by properly selecting the inverter voltage space vectors from a simple look-up table at a predefined sampling time, the desired quasi-square wave current is obtained. Therefore, a much faster torque response is achieved compared to conventional current and voltage control schemes. In addition, for effective torque control, a novel switching pattern incorporating the voltage vector look-up table is designed and implemented for a four-switch inverter to produce the desired torque characteristics. Furthermore, to eliminate the low-frequency torque oscillations, pre-stored back EMF constant versus position look-up tables are designed and used in the torque estimation. As a result, it is possible to achieve two-phase conduction DTC of a BLDC motor drive with faster torque response due to the fact that the voltage space vectors are directly controlled. A theoretical concept is developed and the validity and effectiveness of the proposed DTC scheme are verified through the simulations and experimental results.eninfo:eu-repo/semantics/closedAccessBrushless dc motor drivesdirect torque controlfast torque responsefour switch inverterlow-frequency torque ripplesnon-sinusoidal back EMFtwo-phase conductionArticleQ1Q1252263271WOS:000274731800002