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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....
The stable operation regions are the important issues for direct torque control (DTC) system of permanent magnet synchronous motor (PMSM). The influences of the parameters, such as voltage, current, flux linkage and load angle, on the system operation are investigated through the analysis model presented in this paper. The analysis results show that the parameters must be properly regulated within...
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...
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