Abstract
Rotor position detection is a prerequisite for achieving good control performance of PMSM. For a PMSM control system based on an optical encoder, it is a difficulty to detect rotor position and achieve R-Signal zero-setting. To solve the problem, a hybrid optical encoder is used in the paper by which a scheme for rotor position detection and R-Signal zero-setting is proposed. This encoder can do absolute and incremental rotor position detection simultaneously; here, the former is used for acquiring imprecise rotor position and the latter is for precise rotor position. Firstly, two detection methods of the encoder are analyzed, and a scheme for rotor position detection is proposed: absolute rotor position is used for motor starting before achieving R-Signal zero-setting; once achieving R-Signal zero-setting, incremental rotor position detection that has high precision is adopted. Then a novel scheme for R-Signal zero-setting is emphatically proposed. Finally, the simulation is conducted. Results show that rotor position detection and R-Signal zero-setting can be achieved by the proposed scheme.
Highlights
With the development of permanent magnetic materials and microelectronic technology, PMSMs have been widely used in servo systems due to their superior performance [1,2,3] in recent years
A hybrid optical encoder [16, 17] is used and detection methods of PMSM rotor position based on the encoder are analyzed; a scheme is proposed for rotor position detection and R-Signal zero-setting based on the encoder
Compared with absolute rotor position detection, incremental rotor position detection generally has high accuracy and the signals used for incremental rotor position detection are all digital signals that are not susceptible to interference, which contributes to achieving good control performance of PMSM
Summary
With the development of permanent magnetic materials and microelectronic technology, PMSMs have been widely used in servo systems due to their superior performance [1,2,3] in recent years. As for detection with position sensor, rotary transformer, incremental and absolute optical encoder are commonly used. The difficulty of using incremental optical encoder is reference signal (named R-Signal) zero-setting and how to detect rotor position, before a control system is powered on and rotor position is unknown. Reference [11,12,13] proposed a scheme based on stator current vector that can detect rotor position accurately before a control system is powered on. A hybrid optical encoder [16, 17] is used and detection methods of PMSM rotor position based on the encoder are analyzed; a scheme is proposed for rotor position detection and R-Signal zero-setting based on the encoder. Results show that the rotor position detection and R-Signal zero-setting can be achieved by the proposed scheme
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