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Title: Sensor less DTC of BLDC Motor to Control Torque and Flux with Hysteresis Technique

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Title:
Sensor less DTC of BLDC Motor to Control Torque and Flux with Hysteresis Technique
Author Name:
KAPU V SRI RAM PRASAD
Abstract:
In this paper, the position sensorless direct torque and indirect flux control of brushless dc (BLDC) motor with non-sinusoidal back electromotive force (EMF) has been extensively investigated. Most methods are complicated and do not consider the stator flux linkage control, therefore, possible high-speed operations are not feasible. In this study, a novel and simple approach to achieve a low-frequency torque ripple-free direct torque control (DTC) with maximum efficiency based on dq reference frame is presented. This method does not require pulse width modulation and proportional plus integral regulators and also permits the regulation of varying signals. Furthermore, to eliminate the low-frequency torque oscillations, two actual and easily available line-to-line back EMF constants (kba and kca) according to electrical rotor position are obtained offline and converted to the dq frame equivalents using the new line-to-line park transformation. Then, they are set up in the look-up table for torque estimation. The validity applications of the proposed sensor less three-phase conduction DTC with SVPWM_Hysteresis Controller of BLDC motor drive scheme are verified through simulations results.
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