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access icon free Rotor position estimation scheme with harmonic ripple attenuation for sensorless controlled permanent magnet synchronous motors

© The Institution of Engineering and Technology
Received 25/12/2017, Accepted 08/05/2018, Revised 19/04/2018, Published 10/05/2018

To achieve high-performance sensorless control of permanent magnet motors with non-sinusoidal back electromotive force (EMF), an improved sliding mode observer (SMO) adopting synchronous rotating low-pass filter (SRLPF) is proposed. The SRLPF is utilised to reduce the back-EMF harmonics and extract the fundamental component. Different from the traditional rotor position observer, the proposed observer can calculate the rotor position with the back-EMF fundamental component. Owing to the decrease in the influence of non-sinusoidal back-EMF, the estimated rotor position harmonic ripple error can be greatly reduced. Then, the high estimated accuracy and excellent sensorless control performance can be obtained. In addition, the proposed strategy is easy for implementation. With the comparison between the traditional SMO and the proposed observer, the experiments of the system steady-state error, the speed tracking performance, and the disturbance rejection ability in the speed range from 60 r/min to the rated speed 750 r/min are presented. The validity of the proposed method is conformed.

Inspec keywords: rotors; force control; permanent magnet motors; observers; low-pass filters; harmonics suppression; electric potential; sensorless machine control; position control; variable structure systems; synchronous motors; power harmonic filters

Other keywords: high-performance sensorless control; harmonic ripple attenuation; back-EMF harmonics; electromotive force; improved sliding mode observer; nonsinusoidal back electromotive force; speed tracking performance; rotor position harmonic ripple error estimation; rotor position estimation scheme; synchronous rotating low-pass filter; rotor position observer; SMO; SRLPF; back-EMF fundamental component; sensorless controlled permanent magnet synchronous motors

Subjects: Spatial variables control; Multivariable control systems; Synchronous machines; Power supply quality and harmonics; Control of electric power systems; Mechanical variables control

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