Error analysis and compensation of multipole resolvers

• Published in: Measurement science & technology 1999-12, Vol.10 (12), p.1292-1295
• Main Authors: Mingji, Liu, Yu, Yao, Jibin, Zou, Yongping, Lu, Livingstone, Ngoo, Wenxue, Gao
• Format: Article
• Language: English
• Subjects: Exact sciences and technology; General equipment and techniques; Instruments, apparatus, components and techniques common to several branches of physics and astronomy; Measurement and error theory; Metrology; Metrology, measurements and laboratory procedures; Physics; Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing
• ISSN: 0957-0233; 1361-6501
• DOI: 10.1088/0957-0233/10/12/324

With the development of microelectronics technology, the angular position measurement system for rotor shafts composed of a multipole resolver and a monolithic tracking resolver-to-digital converter has been widely used. This is due to the multipole resolver's low cost, tolerance to disturbance and ease of installation compared with other shaft position transducers such as the rotational inductosyn and optical encoders. However, manufacturing tolerances of the multipole resolver may cause measurement error. The signal errors of the multipole resolver and the measurement error incurred are analysed. Based on the analysis, a compensation method utilizing an analogue circuit for the measurement error is presented. The zero-position error and the amplitude error of the 34-pole resolver are compensated using the compensation circuit presented. Its measurement accuracy is improved significantly from about 15 to 2 min. (Original abstract - amended)