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This paper presents a method for estimation of the rotor speed and position of a BLDC motor. As BLDC motors are non-linear systems, Extended Kalman Filter (EKF), an advanced version of the Kalman filter has been used for designing the control algorithm for the motor. In the proposed work, the motor state variables are estimated using an Extended Kalman Filter, using the measurements of the stator...
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...
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...
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 proposes a new permanent-magnet vernier (PMV) in-wheel motor to meet the new demands arising from electric vehicles (EVs). It can offer the advantages of light weight, compact size and low-speed high-torque operation. The key is to newly introduce the flux-modulation poles (FMPs) which can effectively modulate the high-speed rotating field of the armature windings and the low-speed rotating...
This paper presents the comparison and optimization of a drive system used in an electric bike with outer and inner rotor permanent magnet brushless motor based on theoretical and experimental analysis of e-bike drive. The analyzed e-bike was equipped with the permanent magnet brushless synchronous motor with mechanical output power in range of 250W. The electric motor together with a planetary gear...
The following topics are dealt with: speed control; back-EMF; permanent magnet synchronous machines; sensorless machine control; field-oriented control; brushless dc motors; PMSM; differential magnetic anisotropy; current control; voltage source inverter; rotor; position estimation; IPM motor drives; PWM current harmonics; torque control; reluctance machines; extended Kalman filter; induction motors...
In this paper, we propose an analytical method of polar anisotropic ferrite bonded magnet to outer rotor type brushless dc motor considering magnetizing process. The characteristics of polar anisotropic magnets are different from cored type ones which have uniform magnetization direction. Consequently, the magnetization directions of ferrite bonded magnet are analyzed by finite element analysis for...
An adaptive sliding mode speed and position observer for sensorless control of brushless DC motor (BLDCM) is proposed in this paper. According the mathematical model of BLDCM, the sliding surface was defined based on the errors between actual and estimated currents. Equivalent control and model reference adaptive control (MRAC) is used to obtain position and speed signals of the rotor. The Lyapunov...
High performance motor drive applications require smooth torque with minimum torque ripple. This paper is focused on identifying various design parameters in stator and rotor that can be used in reducing the torque ripple of a sinusoidally excited permanent magnet (PM) brushless DC (BLDC) motor. The paper investigates the sensitivity of various design parameters on torque ripple and torque linearity...
In this paper, stator-flux orientation control strategy for the flux-switching permanent magnet (FSPM) motor under two pulse width modulation (PWM) generation modes, namely current hysteresis and voltage space vector, is investigated and implemented. Firstly, the definition of d- and q-axes for the FSPM motor, which is crucial to the mathematic model and control strategy, is highlighted. The fundamental...
This paper presents the performance analysis of a three-phase three-stack permanent magnet (PM) claw pole motor by using an improved phase variable model, which has been developed for accurate and efficient performance simulation of PM brushless DC motors. The improved model can take into account the effect of magnetic saturation and rotor position dependence of key parameters including back electromagnetic...
This paper presents comparisons between three-phase permanent-magnet motor with ferrite magnets on rotor and other with NdFeB (bonded). Related to this replacement, the advantages and disadvantages are quoted. The analysis of magnetic field is made through the finite element method. The used machine has nonsinusoidal flux. Its application main is in hermetic compressor household refrigeration systems...
This paper presents a novel counter-rotating permanent magnet BLDCM (CRBLDCM) for underwater propulsion. This kind of motor is different from the traditional BLDCM in that both the rotor and the armature are rotating in the opposite directions, which is particularly suitable for underwater propulsion system. In this paper, the mathematical model of CRBLDCM is established based on its operation principle,...
The permanent magnet brushless DC motor (PMBDCM) has a nonsinusoidal back electromotive force (EMF) and requires rectangular stator currents to produce constant and more powerful electromagnetic torque. Sometimes, to smooth the commutation of power electronics, damping windings has to be mounted on the rotor, all these features make the PMBDCM analysis much more complicated. To solve this problem,...
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