An Open-Loop Starting Procedure for Sensorless Control of Synchronous Reluctance Motors

2019 ◽  
Author(s):  
Andrea Credo ◽  
Mauro Paletta ◽  
Simone Paolini ◽  
Marco Tursini
Keyword(s):  
Sensorless Control ◽  
Open Loop

Position Sensorless Control for PMBLDC Motor Drive Using Digital Signal Processor

2016 ◽  
Vol 25 (07) ◽  
pp. 1650077 ◽  
Author(s):  
Sachin Singh ◽  
Sanjeev Singh
Keyword(s):  
Digital Signal Processor ◽  
Sensorless Control ◽  
Digital Signal ◽  
Cost Effective ◽  
Open Loop ◽  
Brushless Dc Motors ◽  
Wide Range ◽  
Permanent Magnet Brushless Dc ◽  
Signal Processor ◽  
Position Sensorless

This paper presents a complete position sensorless control scheme for permanent magnet brushless DC motors (PMBLDCMs) using back-EMF sensing method. The controller is designed in such a way that it provides smooth shifting from open-loop speed-up mode to back-EMF sensing mode at any speed, especially at very low speeds, i.e., less than 2% of the rated speed. The proposed scheme is a simple and cost effective implementation of back-EMF sensing method, which does not require any filtering or phase shift to generate commutation pulses. The proposed controller is designed and modeled for a PMBLDCM rated at 4600[Formula: see text]rpm, 310[Formula: see text]V and 2.2[Formula: see text]N[Formula: see text]m torque and its performance is simulated in MATLAB/SIMULINK environment. The obtained simulation results are validated on a prototype developed in the lab using a digital signal processor (DSP) namely TI 2812 DSP in a wide range of speeds in position sensorless mode.

scholarly journals Sensorless Control of BLDC Motor using Flux Linkage Based Algorithm

2019 ◽  
Vol 8 (6) ◽  
pp. 1549-1556
Keyword(s):  
Sensorless Control ◽  
Digital Signal ◽  
Open Loop ◽  
Control Technique ◽  
Bldc Motor ◽  
Zero Crossing ◽  
Detection Techniques ◽  
Rotor Position ◽  
Low Speeds ◽  
Hall Sensors

The performance of Conventional sensorless back-emf detection techniques for BLDC Motor is poor at low speeds, since at zero and low speeds the magnitude of back-emf is very less. This causes failure of zero crossing instant detection. This paper presents a new Sensorless Control Technique for BLDC motor drive to estimate the rotor position accurately even at zero and low speeds. A new algorithm has been developed to estimate the rotor position based on the prediction of stator flux linkages. The main advantage of the proposed technique is that the flux linkages are independent of the speed. For starting of the motor an open loop starting method was adopted. By implementing this technique the Meta heuristic digital signal control systems like PWM/ADC, PLL are avoided in order to make motor control easy and economical. To verify the accuracy of the proposed technique it is compared with existing hall sensors controlled BLDC drive operation. The validity of proposed scheme is verified through Simulation.

A novel model-based approach for resistance estimation using rise time and sensorless position control of sub-millimetre shape memory alloy helical spring actuator

2017 ◽  
Vol 29 (6) ◽  
pp. 1050-1064 ◽  
Author(s):  
M Sreekanth ◽  
Abraham T Mathew ◽  
R Vijayakumar
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Rise Time ◽  
Position Control ◽  
Sensorless Control ◽  
Open Loop ◽  
Current Drive ◽  
Constant Current ◽  
Helical Spring ◽  
Heating And Cooling

Shape memory alloy shows considerable strain during heating and cooling. This effect is due to its phase transformation with temperature. Due to this property, shape memory alloys can be deployed for physical actuation in place of conventional actuators in bio-medical and bio-mimicking robots. Sub-millimetre diameter shape memory alloy wires wound as helical springs are also used for this purpose. Due to their small size, it is difficult to use sensors for temperature or displacement measurements of shape memory alloy springs. This article attempts to demonstrate that the rise time of the current through a sub-millimetre diameter shape memory alloy helical spring is directly proportional to its displacement. To characterize the rise time–displacement hysteresis, a constant current drive with overcurrent protection is developed. The data generated are utilized to implement an open-loop sensorless control. A method to estimate the resistance from the rise time is proposed with which the temperature of the shape memory alloy during actuation can be obtained. The design avoids using an analogue-to-digital converter for the direct measurement of voltage and current for measuring the resistance variation in the shape memory alloy under actuation. This helps in the development of a new sensorless control using only the digital Input/Output pins of a microcontroller/microprocessor.

scholarly journals The sensorless control strategy of UAV rotor motor in full speed range

2021 ◽  
Vol 261 ◽  
pp. 01010
Author(s):  
Siyuan Ma ◽  
Xiang Yu ◽  
Yunjun Guo ◽  
Rong Ran
Keyword(s):  
Control Strategy ◽  
High Speed ◽  
Closed Loop ◽  
High Efficiency ◽  
Sliding Mode ◽  
Sensorless Control ◽  
Open Loop ◽  
Speed Range ◽  
Full Speed ◽  
Position Sensorless

UAV (Unmanned Aerial Vehicle) has broad application prospects in various fields. In order to meet the needs of stability and efficiency during flight, a surface-mounted permanent magnet synchronous motor is used as its rotor motor, and a position sensorless control technology is used to control the rotor motor with high efficiency and high dynamic response. This paper proposes a position sensorless control strategy in the full speed range for the actual application requirements of UAV. In low speed ange, I/F control strategy with speed-open-loop and current-closed-loop is. In medium and high speed range, a sliding mode observer is adopted to provide estimated rotor position and speed. To achieve smooth switching from I/F control stage to speed closed-loop stage, a switching algorithm is proposed. The feasibility of the proposed hybrid control strategy is verified by simulation results.

Set of open-loop block-diagonalizers of transfer matrices

1989 ◽  
Vol 49 (1) ◽  
pp. 161-168
Author(s):  
A. Bülent Özgü Ler ◽  
Vasfi Eldem
Keyword(s):  
Open Loop ◽  
Transfer Matrices

On closed-loop equilibrium strategies for mean-field stochastic linear quadratic problems

2020 ◽  
Vol 26 ◽  
pp. 41
Author(s):  
Tianxiao Wang
Keyword(s):  
Optimal Control ◽  
Closed Loop ◽  
Optimal Control Problems ◽  
Mean Field ◽  
Open Loop ◽  
Time Inconsistency ◽  
Control Problems ◽  
Linear Quadratic ◽  
Linear Quadratic Optimal Control ◽  
Equilibrium Strategies

This article is concerned with linear quadratic optimal control problems of mean-field stochastic differential equations (MF-SDE) with deterministic coefficients. To treat the time inconsistency of the optimal control problems, linear closed-loop equilibrium strategies are introduced and characterized by variational approach. Our developed methodology drops the delicate convergence procedures in Yong [Trans. Amer. Math. Soc. 369 (2017) 5467–5523]. When the MF-SDE reduces to SDE, our Riccati system coincides with the analogue in Yong [Trans. Amer. Math. Soc. 369 (2017) 5467–5523]. However, these two systems are in general different from each other due to the conditional mean-field terms in the MF-SDE. Eventually, the comparisons with pre-committed optimal strategies, open-loop equilibrium strategies are given in details.

Comparison of Dc-Dc SEPIC, CUK and Flyback Converters Based LED Drivers

2020 ◽  
pp. 99-107
Author(s):  
Erdal Sehirli
Keyword(s):  
Integrated Circuit ◽  
Closed Loop ◽  
Input Voltage ◽  
Open Loop ◽  
Current Sensor ◽  
Switching Frequency ◽  
Led Driver ◽  
Advantages And Disadvantages ◽  
Led Drivers ◽  
Conduction Mode

This paper presents the comparison of LED driver topologies that include SEPIC, CUK and FLYBACK DC-DC converters. Both topologies are designed for 8W power and operated in discontinuous conduction mode (DCM) with 88 kHz switching frequency. Furthermore, inductors of SEPIC and CUK converters are wounded as coupled. Applications are realized by using SG3524 integrated circuit for open loop and PIC16F877 microcontroller for closed loop. Besides, ACS712 current sensor used to limit maximum LED current for closed loop applications. Finally, SEPIC, CUK and FLYBACK DC-DC LED drivers are compared with respect to LED current, LED voltage, input voltage and current. Also, advantages and disadvantages of all topologies are concluded.

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