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- Title
A Modified Direct Torque Control for BLDC Motor Drives.
- Authors
Montazeri, Farshad; Khaburi, Davood Arab
- Abstract
In this paper a modified Direct Torque Control (DTC) scheme for Brushless DC Motors is presented. The aim of this modification is to overcome the problem of variable switching frequency and high torque ripple in conventional hysteresis based controllers of DTC drives. Also with a new modified switching table and a new torque controller, the power recovery and electrical braking performance of BLDC motors are improved. As it is known, in DTC drives for BLDC motors there is a commutation torque ripple, which occurs every 60 electrical degrees. In this novel method, these commutation ripples are completely eliminated by employing the threephase switching table in the preceding time of the commutation periods. This novel method has a simple control structure which is compatible with principle of conventional DTC scheme. In classic DTC drives, the switching frequency is variable. In this paper, in order to obtain a fix switching frequency, a new and simple torque controller is introduced, to replace the conventional hysteresis comparator. These simple modifications have significantly improved the performance of the DTC drive system, while at the same time all the advantages of the basic DTC are still retained. Simulation results have shown the proposed modified DTC scheme causes apparent reduction of the torque ripple and maintaining a constant switching frequency, compared with conventional DTC drives for BLDC motors.
- Publication
International Review on Modelling & Simulations, 2010, Vol 3, Issue 4, p553
- ISSN
1974-9821
- Publication type
Academic Journal