1,721,060 research outputs found
General-Purpose Full-Speed-Range Sensorless SPM Drive: Low-Frequency Injection and Robustness Improvement
No full textSpeed control accuracy and robustness of sensorless drives based on non-salient PMSMs in the low-speed region are critical issues due to the low amplitude of back-EMF. Although open-loop control is commonly adopted up to a sufficiently high speed, it results in low accuracy and poor robustness against load torque and inertia variations or random initial rotor position conditions. Thus, extension of the closed-loop operating range towards zero is strongly desired. An integrated approach based on low-frequency current injection technique and a more general speed control stabilization technique based on reactive current superimposition is shown in this paper, allowing both initial position detection and closed-loop speed control at low-speed. Analytical development, simulation and experimental investigation results will be reported, considering an actual sensorless industrial drive system
A Differential Approach to Resistive Parameters Identification in Salient Rotor PM Synchronous Motors
No full textDSP Based Position Control of PMSM with Real-Time Cycloidal Path Generation for Intelligent Motion Applications
No full textHybrid Modulation and Optimal Neutral-Point Voltage Control for Three-Level NPC Inverters
No full textA preliminary review of advanced carrier based modulation techniques for three-phase three-level NPC inverter is reported, focusing the attention to double signal and hybrid modulations. The problem of the neutral-point balancing is considered and reference to previous proposals recalled. A general analytical approach for the calculation of conduction and switching losses in NPC 3-level inverter is proposed, emphasizing the role of the adopted modulation strategy on the calculations. Finally simulation results are reported based on the model of a grid-connected three-phase three-level neutral-point-clamped inverter
A Method to Detect the Rotor Position of PM Motors at Standstill: Implementation Issues Using TMS320F24x
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Flux-Weakening Control of Surface Mounted PM Synchronous Motors Accounting for Resistive Voltage Drop
No full textThis paper deals with the flux-weakening control of surface mounted permanent magnet synchronous motors, taking into account the influence of the resistive voltage drop in the stator windings, an effect which is usually neglected in similar studies. At first, the motor equations exploiting the optimal torque-speed limits in the flux-weakening region are evaluated and discussed. Then, the influence of the resistive voltage drop is pointed out, evidencing the mismatches related to its neglecting in the set-up of the flux-weakening strategy. Hence, a simplified approach to flux-weakening motor control is presented, useful for the practical implementation in micro-controlled drives. Finally, experimental results are shown, using a position-tracking application as a test case
Sensorless Control of PM Synchronous Motors with Luenberger Observer: Theoretical Issues and Implementation Results
No full textRotor Speed and Position Detection for PM Synchronous Motors Based on Sliding Mode Observer and Kalman Filter
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