DocumentCode :
3380436
Title :
Automatic Offset Calibration of Quadrature Encoder Pulse Sensor for Vector Controlled Drive of Permanent Magnet Synchronous Motors
Author :
Konghirun, Mongkol
Author_Institution :
Dept. of Electr. Eng., King Mongkut´´s Univ. of Technol. Thonburi, Bangkok
fYear :
2005
fDate :
21-24 Nov. 2005
Firstpage :
1
Lastpage :
5
Abstract :
Quadrature encoder pulse (QEP) sensor has been widely used to detect the rotor position of permanent magnet synchronous motors (PMSMs) in the vector controlled drive systems. However, the information regarding to the angular difference between the index signal and the back emfs of motor (so called the index offset) is sometimes lacked in the manufacturers´ datasheets. As a result, by using the incorrect offset, the back emfs are not in phase with the stator currents. Then, the produced electromagnetic torque is not optimal in the vector controlled drive system of PMSM using QEP sensor. This paper presents a practical and simple technique to automatically calibrate this offset. The experimental results will also demonstrate the effects of incorrect offset to the torque production. The overall drive system is implemented on a 32-bit fixed-point digital signal processor based controller (TMS320F2808eZdsp board).
Keywords :
calibration; digital signal processing chips; microcontrollers; permanent magnet motors; synchronous motor drives; synchronous motors; torque; TMS320F2808eZdsp board; automatic offset calibration; electromagnetic torque; fixed-point digital signal processor; permanent magnet synchronous motors; quadrature encoder pulse sensor; vector controlled drive; word length 32 bit; Automatic control; Calibration; Control systems; Magnetic sensors; Manufacturing; Permanent magnet motors; Rotors; Sensor systems; Stators; Synchronous motors;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
TENCON 2005 2005 IEEE Region 10
Conference_Location :
Melbourne, Qld.
Print_ISBN :
0-7803-9311-2
Electronic_ISBN :
0-7803-9312-0
Type :
conf
DOI :
10.1109/TENCON.2005.301305
Filename :
4085105
Link To Document :
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