Position Control of an Interior Permanent-Magnet Synchronous Motor Without Using a Shaft Position Sensor
Ji-Liang Shi
Tian-Hua Liu
Yung-Chi Chang
Nat. Taiwan Univ. of Sci. & Technol., Taipei;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: June 2007
Volume: 54,
Issue: 4
On page(s): 1989-2000
ISSN: 0278-0046
INSPEC Accession Number: 9607795
Digital Object Identifier: 10.1109/TIE.2007.895137
Current Version Published: 2007-07-16
Abstract
This paper proposes a novel sensorless position control system for an interior permanent-magnet synchronous motor. In this paper, a novel rotor position/velocity estimation technique is proposed. This estimation technique only relates to the slopes of the stator currents and does not relate to the parameters or operating conditions of the motor. Neither an extra circuit nor an external high-frequency exciting signal is required here as compared to other position estimation techniques. In addition, the proposed estimator works well in transient, steady-state, and standstill conditions. As a result, the proposed method is very robust and useful. To improve the performance of the position-control system, an optimal controller is proposed. By using this controller, a fast transient response, good load disturbance rejection capability, and satisfactory tracking ability can be achieved. A digital signal processor, TMS-320-LF-2407, is used to execute the rotor position/velocity estimation, the current-loop control, the velocity-loop control, and the position-loop control. As a result, a fully digital position-control system is achieved. Several experimental results validate the theoretical analysis.
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