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 New Approach of Position Sensorless Control for Brushless DC Motor

2020 ◽  
Vol 15 (1) ◽  
pp. 65-76
Author(s):  
N. Hemalatha ◽  
S. Nageswari
Keyword(s):  
Permanent Magnets ◽  
Sensorless Control ◽  
Control Technique ◽  
Bldc Motor ◽  
Zero Crossing ◽  
Brushless Dc ◽  
Detection Circuit ◽  
Field Programmable ◽  
Artificial Neural Network Ann ◽  
Position Sensorless

Background: Position sensorless control technique for Permanent Magnets-Brush Less Direct Current (PM-BLDC) motor drive is considered in this paper. Materials and Methods: A new estimation based on sensorless technique is proposed for PMBLDC motor. Artificial Neural Network (ANN) is aided for the purpose. Results: The inputs to the ANN are the voltages of PM-BLDC motor and it estimates the sample signals to feed Zero Crossing Point (ZCP) detection circuit. The ZCP detection circuit provides ZCP signals for commutation logic which gives the commutation sequence to power switches. In order to provide the correct sample signal to ZCP detection circuit, the ANN is well trained by Genetic Algorithm (GA). The proposed sensor less control model is implemented in MATLAB/SIMULINK working platform. Conclusion: Field Programmable Gate Array (FPGA) is used to implement the proposed method. Experimental results verify the analysis and demonstrate the advantages of the proposed method.

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.

Sensorless Control Strategy for BLDC Motors Based on a Type-3 Phase Locked Loop

2021 ◽  
Author(s):  
Mohamed Abbes ◽  
Souad Chebbi
Keyword(s):  
Control Strategy ◽  
High Performance ◽  
Sensorless Control ◽  
Design Procedure ◽  
Phase Locked Loop ◽  
Control Technique ◽  
Loop Filter ◽  
Zero Crossing ◽  
Industrial Level ◽  
Type 3

This paper presents the design procedure of a high-performance sensorless control strategy for the widely used brushless DC (BLDC) motors. Generally, conventional sensorless techniques are based on detecting the zero-crossing instants (ZCP) of the back electromotives forces (back-EMFs) of the three phases. These methods, although widely adopted and marketed on an industrial level, involve many limitations such as filtering delays, difficulty to operate at low speeds and immunity against Electromagnetic Interferences (EMI). In this paper, the main objective is to develop a sensorless control technique integrally independent from the zero-crossing points of the back-EMFs. In the proposed method, a zero-delay adaptive filter was used to extract the fundamental and the quadrature components of the line-to-line voltage of the motor. Then, the Synchronous Reference Frame Phase Locked Loop (SRF-PLL) is used to estimate the electrical angle of phase-to-phase back-EMF along with the rotor speed. The conventional SRF-PLL was implemented using a second-order loop filter (type-3 PLL) in order to improve synchronization performances and for better rejection of voltage spikes induced in motor phases during commutations. The benefits of the control technique are brought to light through simulation results. An experimental prototype was designed to confirm the validity of the proposed method.

A Novel Sensorless Controlling Technique of a 3-Phase Brushless DC Motor for Industrial Application

2019 ◽  
Vol 16 (12) ◽  
pp. 5032-5041
Author(s):  
Rajesh Nalli ◽  
K. Subbarao ◽  
M. Ramamoorthy ◽  
M. Kiran Kumar
Keyword(s):  
Detection Technique ◽  
Control Technique ◽  
Frequency Noise ◽  
Harmonic Detection ◽  
Third Harmonic ◽  
Detection Techniques ◽  
Rotor Position ◽  
Brushless Dc ◽  
Switching Losses ◽  
Dependent Function

This paper provides the novel sensorless control technique of a 3-phase BLDC motor. The introduction to the conventional sensorless techniques like Back emf detection, free-wheeling diode detection technique, back emf third harmonic detection techniques are discussed. Conventional sensorless technique has its drawbacks like high frequency noise, having more number of switches in free-wheeling diode detection method causes more switching losses. Wrong estimation rotor position in back emf zero detection technique where the floating phase back emf is consider for commutation estimation. In all the above discussed methods the back emf estimation is a speed dependent function, whereas in proposed controlling technique the flux linkage calculation is not a speed (ω) dependent function. So, that the accuracy of rotor position prediction will be better than conventional methods. The analysis of proposed technique is compared with conventional sensor based controlling techniques to validate the accuracy. The proposed technique implemented using MATLAB/SIMULINK software.

scholarly journals Performance Analysis for Open Loop Brushless DC Motor Drive

2019 ◽  
Vol 8 (6) ◽  
pp. 1220-1228
Keyword(s):  
High Speed ◽  
High Reliability ◽  
Research Work ◽  
Load Condition ◽  
Open Loop ◽  
Voltage Source ◽  
Motor Drive ◽  
Bldc Motor ◽  
Good Efficiency ◽  
Rotor Position

This paper presents a broad explanation on the effect of performance of an open-loop representation of a Brushless Direct Current (BLDC) Motor drive supplied from a two-level voltage source inverter (VSI) working on 120-degree mode of conduction. This research work is programming based and it is done in the MATLAB software for both No-load and load condition. BLDC motors are currently growing popularity and replacing brush motor in so many applications, as it can be used in both low and high-speed vehicle system and also in servo drives. The high reliability, good efficiency, high power concentration, less maintenance, simplicity of control and mainly the brushless operation make the BLDC motors superior to others. The presence of electronic elements for the smooth operation of the motor makes it less costly compare to other motors. It has a permanent magnet as a rotor with a balanced 3-phase conductor assembly as armature in its stator. The armature winding is driven by a power electronics inverter which is operating the switches according to the rotor position, sensed by an optical encoder or a Hall Effect sensor. It is found that by tuning the value of rotor position, no-load condition, and trapezoidal armature phase current, the variation in torque can be minimized. Different performance parameters for no-load and load condition of the BLDC motor like phase voltages and currents, speed, electromagnetic torque, d, q axis current and rotor position etc. are determined in MATLAB environment. These parameter evaluations is necessary to achieve better performance in both load and no load condition of BLDC motor in terms of speed and torque as these are the vital point for the selection of the application field of BLDC motor drive.

DC-link current based position estimation and speed sensorless control of a BLDC motor used for electric vehicle applications

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Febin Daya John Lionel ◽  
Jestin Jayan ◽  
Mohan Krishna Srinivasan ◽  
Prajof Prabhakaran
Keyword(s):  
Electric Vehicle ◽  
Electric Vehicles ◽  
Control Mechanism ◽  
Sensorless Control ◽  
Position Estimation ◽  
Control Technique ◽  
Motor Drive ◽  
Bldc Motor ◽  
Speed Sensorless ◽  
Acceleration Technique

Abstract Sensors of any kind contribute to extra space and electronics when they are used in any application. Besides, the sensor noise also has the effect of altering the overall gain of the system. This is more prevalent in non-linear systems like motor control. In applications which have strict space constraints like Electric vehicles, the use of sensors must be optimized, which, in turn, gave rise to many sensorless state estimation strategies. This paper proposes a novel sensorless control technique for brushless direct current (BLDC) motor used in electric vehicle applications. The concept of sensorless control in BLDC Motor drive eliminates the hall-effect position sensor, thereby giving better performance and improves the robustness of the overall drive system. The main objective of this work is to estimate the position of the motor at standstill condition using stator saturation effect concerning the rotor, accelerate the motor from standstill so that enough back EMF is generated. This acceleration technique speeds up the motor to a stage where a self-actuating control mechanism is used to generate control signals with back EMF or line voltages. The motor can be started with a load, which is a significant constraint for electric vehicle application. The proposed method will avoid the reverse rotation of the motor. The proposed work is simulated in Matlab/Simulink software, and results obtained show that it works well under dynamic conditions of starting, acceleration and load switching. The hardware setup of the proposed work is developed using the TMS320F2812 DSP processor. Simulation and experimental results validate the effectiveness of the proposed work for electric vehicle application.

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