Speed Plus Theta Control Strategy for BLDC motor modelling for Electric Power Steering System
- June 12, 2018
- Posted by: RSIS
- Category: Electrical and Electronics Engineering
International Journal of Research and Scientific Innovation (IJRSI) | Volume V, Issue V, May 2018 | ISSN 2321–2705
Speed Plus Theta Control Strategy for BLDC motor modelling for Electric Power Steering System
Rutuja A. Warbhe1, Ajit Nandwadekar2, Hemlata Joshi3, Dushyant Patil4
1,2,3,4 Asst. Professor, Department of Electrical Engineering, Dr. D.Y.Patil Institute of Technology, Pimpri, Pune, Maharashtra, India
Abstract: – Now-a-days, BLDC motors are gaining popularity very rapidly. BLDC motors are highly used in industries. These motors do not use brushes for commutation, instead of that, they are electronically commutated. As compared to Brushed DC motor, Induction motor, BLDC motors have many advantages. The aim of this paper is to show how the harmonics are reduced by employing feedback in the closed loop combined simulation model as compared to an open loop simulation model. For this purpose, the performance of BLDC system is simulated. Combined Strategy employed is speed plus theta .Based on the mathematical model of BLDC motor, the models are analysed using MATLAB/SIMULINK, which can provide accurate predictions of FFT analysis of the system behaviour.
Keywords: BLDC, electronically commuted, MATLAB / SIMULINK, FFT analysis
I. INTRODUCTION
BLDC motors are a type of synchronous motor. The magnetic field generated by the stator and the magnetic field generated by the rotor rotate at the same frequency in case of BLDC motor. BLDC motors do not experience the slip which is normally seen in induction motors. BLDC motors are single-phase, 2-phase and 3-phase configurations. Corresponding to its type, the stator has the same number of windings. Out of these, 3-phase motors are the most popular and widely used.
A BLDC motor is one that retains the characteristics of a dc motor eliminating the commutator and the brushes. In many cases, Brushless DC (BLDC) motors can replace conventional DC motors. There are no brushes on the rotor. They are driven by dc voltage but current commutation is done by solid state switches that mean, the commutation is done electronically. The BLDC motors are available in many different power ratings ranging from very small motors as used in hard disks to large motors in (EV s) i.e. electric vehicles [2]. BLDC motors are highly used in industries such as Aerospace, Appliances, Automotive, Consumer, Medical, Industrial, Automation Equipment and Instrumentation since it has high reliability, high power density, low maintenance requirement, lower cost and lower weight. BLDC motors have many advantages over brushed DC motors.
