Design and Implementation of Position Sensorless Field-Excited Flux-Switching Motor Drive Systems

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.

Review of Control Topologies for Flux Switching Motor

“…The salient features of different sensorless controllers are summarized in Table 5. [31], [56], [57], [58], [59], [60], [61], [62], [63], [64], [65], [66] Sensorless controllers estimate the rotor position or speed at that instant, but to improve the fault tolerance of the motor, the FIGURE 19. Pictorial representation of sensorless controllers [34], [42], [43], [44], [45], [46], [47], [48], [49], [50], [51], [52], [53], [54], [55].…”

“…TABLE 6. Summary of salient features of predictive control techniques [31], [56], [57], [58], [59], [60], [61], [62], [63], [64], [65], [66], [69]. PI controller is also used along with the Dahalin controller in the current loop for single-phase DCFSM in [40] to minimize torque ripple [41].…”

“…A sensorless predictive controller with Extended Kalman Filter (EKF) is implemented in [65]. A high voltage carrier injection method is implemented in [66], to reduce the rotor position error to ±2 (refer Fig. 16).…”

Design and Control of Electrical Motor Drives

“…By using the proposed method, the IPMSM motor could be operated from 0 r/min to 3000 r/min. Liu et al [10] proposed three types of predictive controllers for sensorless flux-switching motor drive systems. An estimated rotor position method that had nearly ±2 electrical degrees was developed.…”

“…This Special Issue contains the successful invited submissions [1][2][3][4][5][6][7][8][9][10][11] to a Special Issue of Energies on the subject of the "Design and Control of Electrical Motor Drives". Electrical motor drives are widely used in industry, automation, transportation, and home appliances.…”