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In this paper, an improved control strategy (ICS) based on the duty ratio modulation, by properly matching the positive voltage vectors with the new zero voltage vectors (ZVVs), is proposed in direct torque control (DTC) of brushless DC motor (BLDCM). The traditional voltage switching table for the six switches of the converter is modified according to this strategy to minimize the torque ripple....
This paper presents a 12-sector control method, based on the new zero voltage vectors (ZVVs), in direct torque control (DTC) of brushless DC motor (BLDCM). The 12-sector method can apply more new ZVVs in a single control period than the 6-sector method. As the new ZVVs play a key role with respect to preventing the freewheeling current in the switch off phase, this method is better qualified to avoid...
Traditionally the voltage vector is defined as zero voltage vector (ZVV) when all power switches are off in direct torque control (DTC) system of brushless DC motor (BLDCM). However the study on the voltage and current of the conducting phase windings shows that the voltage vector is not actually zero by using the traditional ZVV. So it is redefined in this paper according to the definition of ZVV...
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