IPMSM torque control strategies based on LUTs and VCT feedback for robust control under machine parameter variations

In recent years, Interior Permanent Magnet Synchronous Machines (IPMSMs) have attracted a considerable attention in the scientific community and industry for Electric and Hybrid Electric Vehicle (HEV) propulsion systems. Lookup Table (LUT) based Field Oriented Control (FOC) strategies are widely used for IPMSM torque control. However, LUTs strongly depend on machine parameters. Deviations of these parameters due to machine ageing, temperature or manufacturing inaccuracies can lead to control instabilities in the field weakening region. In this paper, two novel hybrid IPMSM control strategies combining the usage of LUTs and Voltage Constraint Tracking (VCT) feedbacks are proposed in order to overcome the aforementioned controllability issues. Simulation results that demonstrate the validity of the proposed approaches are presented.Postprint (author's final draft

A Novel PMSM Hybrid Sensorless Control Strategy for EV Applications Based on PLL and HFI

In this paper, a novel hybrid sensorless control strategy for Permanent Magnet Synchronous Machine (PMSM) drives applied to Electric Vehicles (EV) is presented. This sensorless strategy covers the EV full speed range and also has speed reversal capability. It combines a High Frequency Injection (HFI) technique for low and zero speeds, and a Phase-Locked Loop (PLL) for the medium and high speed regions. A solution to achieve smooth transitions between the PLL and the HFI strategies is also proposed, allowing to correctly detect the rotor position polarity when HFI takes part. Wide speed and torque four-quadrant simulation results are provided, which validate the proposed sensorless strategy for being further implemented in EV.Peer ReviewedPostprint (author's final draft

IPMSM torque control strategies based on LUTs and VCT feedback for robust control under machine parameter variations

In recent years, Interior Permanent Magnet Synchronous Machines (IPMSMs) have attracted a considerable attention in the scientific community and industry for Electric and Hybrid Electric Vehicle (HEV) propulsion systems. Lookup Table (LUT) based Field Oriented Control (FOC) strategies are widely used for IPMSM torque control. However, LUTs strongly depend on machine parameters. Deviations of these parameters due to machine ageing, temperature or manufacturing inaccuracies can lead to control instabilities in the field weakening region. In this paper, two novel hybrid IPMSM control strategies combining the usage of LUTs and Voltage Constraint Tracking (VCT) feedbacks are proposed in order to overcome the aforementioned controllability issues. Simulation results that demonstrate the validity of the proposed approaches are presented

Effect of different control methods on Cuscuta campestris, and growth and productivity of eggplant (Solanum melongena)

A field experiment was conducted in Al-Qizuina district-province of Najaf during the 2017 growing season in order to control parasitizing dodder (Cuscuta campestris) on eggplants through increasing plant growth and inducing plant resistance using nutrients and herbicide. The experiment arranged within RCBD with three replicates. Results showed significant differences between treatments. Among all the treatments, Boric acid resulted in the highest values of leaf number, leaf area, plant height, fresh and dry weight of shoot and root, thickness of bark, epidermis and petiole cortex of the leaf, and shorter time to fruit maturity as well as no infection was detected. While, Na2SiO3 resulted in higher values of stem diameter, earliness in first flower formation and higher of fruit set, number of fruit per plant, fruit weight and plant productivity, early (13.84 ton.ha-1)and total yield (69.24 ton.ha-1). The herbicide Sulfosulfuron was effective to control dodder resulted in filaments decease and prevented its flowering compared to the mechanical control and the other infected treatments in which dodder not only reduced the eggplants vegetative growth but also affected the quality and quantity of early (5.82 ton.ha-1) and total yield (44.39 ton.ha-1). These results confirm the using of high efficient treatments in to control dodder which can be practically applied in the integrate management program of this pest