Abstract
Field-excited flux-switching motor drive systems have become more and more popular due to their robustness and lack of need for a permanent magnet. Three different types of predictive controllers, including a single-step predictive speed controller, a multi-step predictive speed controller, and a predictive current controller are proposed for sensorless flux-switching motor drive systems in this paper. By using a 1 kHz high-frequency sinusoidal voltage injected into the field winding and by measuring the a-b-c armature currents in the stator, an estimated rotor position that is near ± 2 electrical degrees is developed. To improve the dynamic responses of the field-excited flux-switching motor drive system, predictive controllers are employed. Experimental results demonstrate the proposed predictive controllers have better performance than PI controllers, including transient, load disturbance, and tracking responses. In addition, the adjustable speed range of the proposed drive system is from 4 r/min to 1500 r/min. A digital signal processor, TMS-320F-2808, is used as a control center to carry out the rotor position estimation and the predictive control algorithms. Measured results can validate the theoretical analysis to illustrate the practicability and correctness of the proposed method.
Highlights
The flux-switching motor is a type of double-salient structured motor with two windings in the stator, including an armature winding and a field winding, which could be replaced by a permanent magnet
Several researchers have investigated the design of different types of flux-switching motors [3,4,5]
One-Step Predictive Speed Controller it has been used for power converters and motor drives [21,22,23]
Summary
The flux-switching motor is a type of double-salient structured motor with two windings in the stator, including an armature winding and a field winding, which could be replaced by a permanent magnet. Nguyen et al proposed rotor position sensorless control of a field-excited flux-switching motor drive system using a high-frequency square-wave voltage injecting method to replace an encoder [14]. Proposed sensorless control of a five-phase interior permanent magnet synchronous motor (IPMSM) based on a high-frequency sinusoidal voltage injection [16]. Compared to previously published papers [9,10,11,12,13,14,15,16,17], this paper is the first to propose predictive controllers for a sensorless field-excited flux-switching motor drive system. To the authors’ best knowledge, this idea is an original idea This is the first time that a multi-step predictive speed controller is developed and compared to a single-step predictive speed controller for a flux-switching motor drive system. The high torque ripple, large volume, and serious acoustic noise may not be the main issues for the applications of vacuum cleaners and grass cutters
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