scholarly journals Sensorless PMSM Drive Implementation by Introduction of Maximum Efficiency Characteristics in Reference Current Generation

Energies ◽  
2019 ◽  
Vol 12 (18) ◽  
pp. 3502
Author(s):  
Plantić ◽  
Marčič ◽  
Beković ◽  
Štumberger
Keyword(s):  
Closed Loop ◽  
Maximum Efficiency ◽  
Switching Frequency ◽  
Permanent Magnet Synchronous Machine ◽  
Maximum Torque ◽  
Reference Current Generation ◽  
Bus Voltage ◽  
Maximum Torque Per Ampere ◽  
Selection Of

This paper presents the efficiency improvement in a speed closed-loop controlled permanent magnet synchronous machine (PMSM) sensorless drive. The drive efficiency can be improved by minimizing the inverter and the PMSM losses. These can be influenced by proper selection of DC-bus voltage and switching frequency of the inverter. The direct (d-) and quadrature (q-) axis current references generation methods, discussed in this paper, further improve the efficiency of the drive. Besides zero d-axis current reference control, the maximum torque per ampere (MTPA) characteristic is normally applied to generate the d- and q-axis current references in vector controlled PMSM drives. It assures control with maximum torque per unit of current but cannot assure maximum efficiency. In order to improve efficiency of the PMSM drive, this paper proposes the generation of d- and q-axis current references based on maximum efficiency (ME) characteristic. In the case study, the MTPA and ME characteristics are theoretically evaluated and determined experimentally by measurements on discussed PMSM drive. The obtained characteristics are applied for the d- and q-axis current references generation in the speed closed-loop vector controlled PMSM drive. The measured drive efficiency clearly shows that the use of ME characteristic instead of MTPA characteristic or zero d-axis current in the current references generation improves the efficiency of PMSM drive realizations with position sensor and without it—sensorless control.

scholarly journals Asymmetrical ZVS-PWM Switched-Capacitor Based Half-Bridge DC-DC Converter With Switch Peak Voltage of Vin/2

2020 ◽  
Author(s):  
Angelica Paula Caus ◽  
Guilherme Martins Leandro ◽  
Ivo Barbi
Keyword(s):  
Theoretical Analysis ◽  
Power Converter ◽  
Maximum Efficiency ◽  
Switching Frequency ◽  
Switched Capacitor ◽  
Peak Voltage ◽  
Zero Voltage Switching ◽  
Power Switches ◽  
Converter Topology ◽  
Bus Voltage

This paper presents a new power converter topology<br>generated by the integration of the asymmetrical ZVS-PWM dcdc converter with a switched-capacitor ladder-type commutation<br>cell. Circuit operation and theoretical analysis with emphasis on<br>the soft-commutation process are included in the paper. The<br>main advantage of the proposed converter with respect to the<br>conventional asymmetrical half-bridge dc-dc converter is the<br>reduction of the voltage stress across the power switches to the<br>half of the input dc bus voltage, enabling the utilization of lower<br>voltage rating components. Experiments conducted on a<br>laboratory prototype with 1.4 kW power-rating, 800 V input<br>voltage, 48 V output voltage and 100 kHz switching frequency<br>are included, to verify the theoretical analysis and the design<br>methodology. The maximum efficiency of the experimental nonoptimized prototype was 93.6%.<br>Index Terms - Asymmetrical dc-dc converter, pulse-widthmodulation, switched-capacitor, zero voltage switching.<div><br><br></div>

scholarly journals Asymmetrical ZVS-PWM Switched-Capacitor Based Half-Bridge DC-DC Converter With Switch Peak Voltage of Vin/2

2020 ◽  
Author(s):  
Angelica Paula Caus
Keyword(s):  
Theoretical Analysis ◽  
Power Converter ◽  
Maximum Efficiency ◽  
Switching Frequency ◽  
Switched Capacitor ◽  
Peak Voltage ◽  
Zero Voltage Switching ◽  
Power Switches ◽  
Converter Topology ◽  
Bus Voltage

This paper presents a new power converter topology<br>generated by the integration of the asymmetrical ZVS-PWM dcdc converter with a switched-capacitor ladder-type commutation<br>cell. Circuit operation and theoretical analysis with emphasis on<br>the soft-commutation process are included in the paper. The<br>main advantage of the proposed converter with respect to the<br>conventional asymmetrical half-bridge dc-dc converter is the<br>reduction of the voltage stress across the power switches to the<br>half of the input dc bus voltage, enabling the utilization of lower<br>voltage rating components. Experiments conducted on a<br>laboratory prototype with 1.4 kW power-rating, 800 V input<br>voltage, 48 V output voltage and 100 kHz switching frequency<br>are included, to verify the theoretical analysis and the design<br>methodology. The maximum efficiency of the experimental nonoptimized prototype was 93.6%.<br>Index Terms - Asymmetrical dc-dc converter, pulse-widthmodulation, switched-capacitor, zero voltage switching.<div><br><br></div>

Anti-windup for Euler-Lagrange Plants

2011 ◽  
Author(s):  
Luca Zaccarian ◽  
Andrew R. Teel
Keyword(s):  
Asymptotic Stability ◽  
Global Asymptotic Stability ◽  
Closed Loop ◽  
Industrial Robots ◽  
Robot Arm ◽  
Compensation Scheme ◽  
Nonlinear Plants ◽  
Puma Robot ◽  
Selection Of

This chapter considers a specific case study where the model recovery anti-windup (MRAW) framework is applied to a class of nonlinear plants consisting of all fully actuated Euler-Lagrange systems. For such plants, an anti-windup construction is proposed that is capable of recovering global asymptotic stability of the closed loop with saturation as long as the unconstrained controller guarantees global asymptotic stability and local exponential stability of the unconstrained closed loop. The chapter first explains how MRAW for the saturated closed loop can be performed by generalizing the compensation scheme for linear plants, highlighting the selection of the stabilizer as a key aspect of successful anti-windup augmentation. It then presents some simulation examples to demonstrate the proposed anti-windup construction, including its application to a simple nonlinear robot arm and to models of two industrial robots, the PUMA robot and the SCARA robot.

scholarly journals Asymmetrical ZVS-PWM Switched-Capacitor Based Half-Bridge DC-DC Converter With Switch Peak Voltage of Vin/2

2020 ◽  
Author(s):  
Angelica Paula Caus ◽  
Guilherme Martins Leandro ◽  
Ivo Barbi
Keyword(s):  
Theoretical Analysis ◽  
Power Converter ◽  
Maximum Efficiency ◽  
Switching Frequency ◽  
Switched Capacitor ◽  
Peak Voltage ◽  
Zero Voltage Switching ◽  
Power Switches ◽  
Converter Topology ◽  
Bus Voltage

This paper presents a new power converter topology<br>generated by the integration of the asymmetrical ZVS-PWM dcdc converter with a switched-capacitor ladder-type commutation<br>cell. Circuit operation and theoretical analysis with emphasis on<br>the soft-commutation process are included in the paper. The<br>main advantage of the proposed converter with respect to the<br>conventional asymmetrical half-bridge dc-dc converter is the<br>reduction of the voltage stress across the power switches to the<br>half of the input dc bus voltage, enabling the utilization of lower<br>voltage rating components. Experiments conducted on a<br>laboratory prototype with 1.4 kW power-rating, 800 V input<br>voltage, 48 V output voltage and 100 kHz switching frequency<br>are included, to verify the theoretical analysis and the design<br>methodology. The maximum efficiency of the experimental nonoptimized prototype was 93.6%.<br>Index Terms - Asymmetrical dc-dc converter, pulse-widthmodulation, switched-capacitor, zero voltage switching.<div><br><br></div>

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