Title :
Torque ripple reduction in direct torque controlled Brushless DC motor
Author :
Li, Zhenguo ; Wang, Lu ; Zhang, Songfa ; Zhang, Chunjiang ; Ahn, Jin-Woo
Author_Institution :
Key Lab. of Power Electron. for Energy Conservation & Motor Drive of Hebei Province, Yanshan Univ., Qinhuangdao, China
Abstract :
This paper describes torque ripple reduction in direct torque controlled Brushless DC Motor. The zero voltage vector in present most direct torque control technique is defined as the state when all switches are turn-off. However, in studying the circuit of the switch state in each sector, recognized the voltage of motor windings are not zero. Thus, six switch states corresponding to zero voltage vector as well as the rule to select zero voltage vector are proposed based on analyzing voltage vector one by one in each sector. Besides, the method of estimating electromagnetic torque according to stator current and back-EMF constant which is difficulty to off-line detect since, to most motors, neutral line of stator winding is not lead-out. So this paper adopts line back-EMF constant which is easy to detect off-line to estimate electromagnetic torque and give the formula. Finally, results of Matlab simulation and DSP experiment are given to verify the validity and feasibility.
Keywords :
brushless DC motors; machine control; torque control; DSP; Matlab simulation; brushless DC motor; direct torque control technique; electromagnetic torque estimation; line back-EMF constant; motor windings; stator current; torque ripple reduction; zero voltage vector; Brushless DC motors; Couplings; Electromagnetics; Stator windings; Torque; Vectors;
Conference_Titel :
Electrical Machines and Systems (ICEMS), 2011 International Conference on
Conference_Location :
Beijing
Print_ISBN :
978-1-4577-1044-5
DOI :
10.1109/ICEMS.2011.6073659