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The speed and position estimation from Back EMF has been a problem under speed reversal response due to change of sign of speed. In this paper, an algorithm using fuzzy logic is proposed to estimate the speed and position of BLDC motor from back EMF for sensorless brushless DC (BLDC) motor drives to improve the performance of conventional sensorless drives. Most existing sensorless methods of the...
This paper presents an investigative study into minimising the cogging torque of a novel three phase surface mounted PM brushless DC motor. The motor is novel because it has a non-integer stator-rotor pole ratio and also asymmetric stator pole arcs. In the paper, the results of the work demonstrate how the optimum stator pole asymmetric arc ratio and pole shoe radial depth or thickness can be found...
Magnetic field analysis of the Halbach array permanent magnet brushless dc machine was carried out. Initial designs, selection of major parameters, prediction of airgap field density are carried out by using the analytical model. Performance of three types of machine configurations, Slotless PMBDC, Coreless enclosed rotor type with and without Halbach array magnet of same envelope are analyzed using...
Permanent magnet brushless dc (PM BLDC) motors offer various advantages such as high efficiency, compactness and easy controllability which are absolutely beneficial in domestic appliances. Ceiling fans, in general, are driven by single-phase induction motors with an overall system efficiency of about 30%. This paper presents the design, analysis, and development of a 170 V, 20 W, 360 rpm, single-phase...
This paper describes a control system of sensorless brushless DC(BLDC) motor. Firstly, the back-EMF is adopted to detect rotor position. Secondly, the back-EMF is very small in the motor starting process, and it is difficult to obtain rotor position efficiently. A re-setting method of the rotor is proposed in the paper, and current closed loop is used for high-speed and safety in the motor starting...
This paper has introduced a design of digital speed control system of permanent magnet brushless DC motor based on MCS-80C196KC.The system use Direct Back-EMF to detect rotor position, and combined with three-start technology to expand the speed control range. Application of Double Closed Loop PID control method to overcome the limitations of conventional control methods, which provide a new way for...
Sinusoidally-fed permanent magnet brushless dc (PM BLDC) motors are supposed to develop effectively ripple-free dynamic torques. This is done by having a sinusoidal flux density distribution in the airgap followed by a rotor position dependent sinusoidal excitation of the phase windings. There are different rotor topologies used in these motors. In this paper, five types of generally used rotor topologies...
Brushless DC (BDC) motors are widely used in aerospace applications because of their high power to weight ratio, low maintenance and reliable operation over long periods of time. These advantages also make them preferred over brushed DC motors for several other applications. But the requirement of an electronic speed controller for commutation and customization for specific applications makes BDC...
A gear-less drive for a wheel chair based on brushless DC motor is presented. The motor has external rotor equipped with neodymium-based permanent magnets and the inner stator is attached to the wheel axle. The performance of the motor is determined using three-dimensional FEM modeling. They are validated by the experimental measurements carried out on the motor prototype.
This paper presents the analysis of Fuzzy Logic controller for permanent magnet brushless DC motor drive for simulation and experimental results. Initially a fuzzy controller is developed by using MATLAB Fuzzy-Logic Toolbox and then inserted into the Simulink model. The dynamic characteristics of the brushless dc motor such as speed, torque, currents and voltages of the inverter components are easily...
This paper presents a new dual-stator doubly salient brushless DC generator (DSBLDCG). The key of the proposed generator is to reduce the voltage and torque ripples. Finite element analysis (FEA) of the generator is carried out to investigate the magnetic field distribution at different rotor positions. Furthermore, flux-linkage and inductance characteristics are also given. The simulation of the...
Two methods of extracting the rotor position and speed for a sensorless single phase BLDC-PM motor drive by measuring only the phase current are presented here. Both methods are based on a generated orthogonal flux system. The first method extracts the position information by using the tan-1 function and then an improved observer is created by adding a 4th order harmonic term in the estimated position,...
The basic advantage of stepper motors over other types of motors is that it can be driven by digital and open-loop control. However an open loop control shows a poor dynamic performance and is insufficient in precise motions which require a high dynamic, so a closed loop control is required. This paper describes field oriented control which will improve the dynamic performance of the Hybrid stepper...
Sensorless Brushless DC motors have been a research focus home and abroad, because their characteristics of small volume, high reliability, strong anti-interference and the ability to overcome inaccurate commutation caused by mechanical installation. This article will carry on a research on the operation principles and performance characteristics of sensorless DC motors and methods that terminal voltage...
This paper presents two high speed brushless DC (BLDC) prototype motors: one is related to the surface-mounted permanent magnet (SPM) rotor, the other to the interior permanent magnet (IPM) rotor. The IPM rotor is a combination of magnets magnetized in tangential direction and in radial direction. As for the two prototype motors, the magnetic field distribution in the air gap calculated by 2D finite...
This paper presents improved sensorless operation of permanent magnet brushless DC motor (BLDC) based back-EMF digital filtering using the dsPIC30F6010 microcontroller. Normally, the back-EMF signal of the unexcited phase winding has significant noise distortion PWM signals which are used to vary the applied voltage, and therefore the speed of the motor. So it is relatively difficult to detect the...
This paper presents a direct current controlled pwm method for control of four-switch, three phase BLDC motor. The main features of this converter are twofold: the first is the reduction of switches and freewheeling diode count, the second is the reduction of conduction losses. For effective utilization of the developed system, a novel direct current controlled pwm scheme is designed and implemented...
This paper presents the analysis of Fuzzy Logic controller for permanent magnet brushless DC motor drive. The brushless direct current (BLDC) motor is efficiently controlled by Fuzzy logic controller compare to the other type of controllers. The dynamic characteristics of the brushless dc motor such as speed, torque, currents and voltages of the inverter components are easily observed and analyzed...
This paper describes the conceptual principle, operation and control of a low friction, low maintenance power delivering motor using a diamagnetically stabilized levitating rotor. The planar rotor described in this paper rotates due to nine electromagnets evenly spaced around the rotor. An optical encoder feedback system is designed and fabricated that controls the frequency of the levitating rotor...
In order to implement aerospace brushless DC machine servo control system in a high-temperature hostile environment, a novel electromagnetic rotor position sensing device was put forward. Concentrated excitation windings and detection ones were alternately mounted on the stator teeth. The rotor cylinder outer surface was notched at the corresponding positions of the magnetic S poles on the machine...
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