Sensor-Less Control for Brushless DC Motors Based on Hybrid Sliding Mode Observer

2014 ◽  
Author(s):  
Hang Zhang ◽  
Yifeng Tu ◽  
Tao Wang
Keyword(s):  
Sliding Mode ◽  
Sliding Mode Observer ◽  
Brushless Dc Motors ◽  
Brushless Dc ◽  
Dc Motors

Design and Research of a Sliding Mode Observer Based on Line Back-EMF for Brushless DC Motors

2014 ◽  
Vol 615 ◽  
pp. 11-17
Author(s):  
Lai Cai Ju ◽  
Zi Qiang Wang ◽  
Meng Yu He
Keyword(s):  
Sliding Mode ◽  
Sliding Mode Observer ◽  
External Disturbances ◽  
Position Information ◽  
Brushless Dc Motors ◽  
Brushless Dc ◽  
Dc Motors ◽  
Position Signal ◽  
Three Phase ◽  
On Line

This paper designs and implements a sliding mode observer with line-to-line trapezoidal back-EMF for brushless DC (BLDC) motor. Through the detection of three phase voltage and the current, the phase to-phase back-EMF is observed, and then the position signal and the rotor speed are estimated. The corresponding relationship between back-EMF and six rotor positions of the motor is established in this paper. With saturation function instead of sign function, the line current difference is used as the sliding surface. The whole control system employs an inner current PI loop with an outer speed PI loop. Simulation results show that the designed observer can correctly estimate the position information and speed, with strong robustness to changes of system parameters and external disturbances.

scholarly journals Real-time implementation of a novel hybrid fuzzy sliding mode control of a BLDC motor

2019 ◽  
Vol 10 (3) ◽  
pp. 1167
Author(s):  
Ali Mousmi ◽  
Ahmed Abbou ◽  
Yassine El Houm
Keyword(s):  
Fuzzy Logic ◽  
Fuzzy Logic Controller ◽  
Hybrid Control ◽  
Sliding Mode ◽  
Fast Response ◽  
Bldc Motor ◽  
Tracking Accuracy ◽  
Brushless Dc Motors ◽  
Brushless Dc ◽  
Dc Motors

<span lang="EN-US">This paper presents a novel hybrid control of a BLDC motor using a mixed sliding mode and fuzzy logic controller. The objective is to build a fast and robust controller which overcome classical controllers’ inconveniences and exploit the fast response of brushless dc motors characterized by an intense torque and fast response time. First the paper study pros and cons of both sliding mode and fuzzy logic controllers. Then the novel controller and its stability demonstration are presented. Finally the proposed controller method is used for the speed control of a BLDC motor 3KW. The obtained results are compared with those of a fuzzy logic and a conventional sliding mode controller. It allows to show performance of the proposed controller in terms of speed response and reaction against disturbances, which is improved more than 5 times without losing stability or altering tracking accuracy</span>

Variable Structure Control of the Brushless DC Motor

2011 ◽  
Vol 345 ◽  
pp. 79-82
Author(s):  
Xu Gang Wang ◽  
Xin Hua Li
Keyword(s):  
Control System ◽  
Sliding Mode ◽  
Tracking Error ◽  
Variable Structure Control ◽  
Variable Structure ◽  
Brushless Dc Motors ◽  
Structure Control ◽  
Brushless Dc ◽  
Dc Motors ◽  
Result Show

In order to increase the degree of the angular velocity tracking precision of the brushless DC motors control system, the controller is designed using the variable structure control with sliding mode. The mathematical model of the brushless DC motors is built. The sliding mode function includes tracking error and the differential coefficient of the tracking error. In order to alleviate the chattering, the saturation function replaces the sign function. The simulation result show the tracking precision is high and the controller output has not obvious chattering. The controller meets the tracking precision of he brushless DC motors control system.

Recent Challenges and Advances in the Sensorless Commutation of Brushless DC Motors

2020 ◽  
Vol 13 ◽  
Author(s):  
Umesh Kumar Soni ◽  
Ramesh Kumar Tripathi
Keyword(s):  
Initial Position ◽  
Position Estimation ◽  
Current Response ◽  
Flux Linkage ◽  
Brushless Dc Motors ◽  
Position Sensing ◽  
Brushless Dc ◽  
Dc Motors ◽  
Reverse Torque ◽  
Position Detection

Background: Brushless DC motors are highly efficient motors due to its high torque to weight ratio, compact design, high speed operating capability and higher power density. Conventional Hall sensor based rotor position sensing is affected by the heating, vibration, interference and noise. Objective: The innovative, cost effective and easily implementable sensorless techniques are essential in order to achieve high efficiency, reduced current and reduced torque pulsations. Further, a delay free, high load fast startup is also important issue. Methods: In this paper an extensive review of various techniques based on the detection of freewheeling diode current, phase back EMF zero crossoing point detection, back EMF integration method and third harmonic back EMF was done. The study and effect of various PWM strategies on back EMF detection was studied. Later on the sensorless schemes based on flux linkage estimation and flux linkage increment were introduced. The load torque observers, unknown input observers, sliding mode observers, L∞-induced observers, H ∞ - deconvolution filter for back EMF estimation were also reviewed. As the brushless DC motors have no back EMF at starting and for back EMF based commutation a minimum speed is required for sufficient back EMF. Therefore various strategies of open and close-loop reduced current startup have been studied to achieve effective commutation without reverse torque. Initial position detection (IPD) schemes, which are mostly based on saliency and current response to inductance variation, is effective where reverse torque is strictly prohibited. A detailed review of these initial position detection techniques (IPD) has also been presented. Results: The detailed mathematical and graphical analysis has been presented here in order to understand the working of the state-of-art sensorless techniques. Conclusion: The back EMF detection using direct and indirect methods of terminal voltage filtering have the problem of delay and attenuation, PWM noise, freewheeling diode spikes and disturbance in detected back EMFs is a drawback. The parameter detuning, underestimation and overestimation, offset problem, system noise and observer gain variation etc. limit the applicability of observer based technique. Therefore, a more robust and precise position estimation scheme is essential.

Sign in / Sign up

Export Citation Format

Share Document