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Brushless DC (BLDC) motors have been applied extensively in household and industrial scale because of the advantages such as high efficiency and low mechanical losses because it does not use a brush such as DC motors. Application of the BLDC motors use rectified AC source to minimize battery usage. However, the use of BLDC motors and rectifying circuit causing poor power factor and facing harmonic...
This paper deals with the driver design for Brushless DC Motor (BLDCM) by quasi-sinusoidal voltage source inverter with voltage space vector pulse width modulation (VSVPWM) technology. Traditionally, BLDCM is driven by six-step inverter with digital Hall sensor feedback, and has the property of trapezoidal back EMF. However, this paper presents an approach to generate a quasi-sinusoidal voltage source...
Common mode voltage of the inverter output create a leakage current in the stator. It creates a net magnetic flux link with the shaft and induces an electromotive force (EMF) in between the two ends of the rotor. This EMF generates a current through two bearings and reduces its lifetime. In this study, we propose a frequency selective low impedance path to dissipate the EMF in the shaft. Finally,...
Three-phase BLDC motors are widely used for industrial applications that require medium and very high speeds and it is mostly preferred for electric vehicles as it provides high efficiency, low maintenance, long life, low weight and compact construction. This paper presents the implementation of sensored control of three-phase brushless DC motor using FPGA. The commutation is implemented using FPGA...
This paper deals with analysis and design of a speed controller for PMBLDC motor. The brushless DC motor has permanent-magnets on rotor and the stator windings are wound such that the back electromotive force is trapezoidal in nature. The control unit used is a PI controller, which governs the duty cycle of the PWM pulses applied to the switches of the inverter to run the motor at desired speed. The...
Multi-phase (more than three-phase) motor drive systems have attracted much attention in recent years due to some inherent advantages which they offer when compared to the three-phase counterpart. Presently the grid power available is only limited to three-phase so the supply to multi-phase motors is invariably given from power electronic converters. For applications operating with electric cars,...
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 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...
The paper deals with isotropic PM-brushless drives in configuration “single-inverter, dual-motor” operating with unbalanced load-torques. After a short review of some control techniques based on the classical control methodologies of single-motor PM drives, an innovative control algorithm is presented. It is suitable to minimize the resultant armature current needed to obtain an assigned resultant...
It is presented a new method to control brushless micromotors which eliminates freewheeling currents. To test the method, a new driver has been designed and fabricated in a 0.35 ??m standard CMOS process. It is shown in the paper how the driver is effectively reducing the freewheeling currents.
A predictive control of a brushless DC generator supplying a load connected to the DC-link capacitor is presented in this paper. The tracking characteristic of the prime-mover is considered for setting the reference value of the electromagnetic torque developed by the generator. This reference is assumed in order to determine the switching pattern of the AC/DC converter, at each sampling period, under...
A digital speed and high resolution position identification algorithm, suitable for brushless DC (BLDC) drives, is presented in the paper. The proposed digital algorithm is synthesized by using the Popov Hyperstability Theory, by means of the current signal samples. The ??a priori?? and ??a posteriori?? current errors are introduced in the adaptation mechanism to force the estimated samples of speed...
This paper presents a new magnetic suspension control strategy for the bearingless brushless DC motor. In the proposed control strategy, general-purpose 3-phase inverters are used to control the rotor radial position; in conventional control schemes, 2-phase inverters are usually used. By using 3-phase inverters, the number of inverters and controllers can be decreased. In addition, the suspension...
This paper proposes a macro-model to simulate of four-switch, three-phase inverter (FSTPI) brushless DC (BLDC) motor drive using switching functions. The proposed model uses inverter switching functions instead of actual circuits, and capable to show the whole steady state and transient performance of the drive. An entire BLDC motor drive including power conversion unit, BLDC motor, current and speed...
In this paper, the design of brushless synchronous motor soft-start system was studied. On the basis of principle of the soft starter system, the applications of brushless motor exciting system was detailed, engineering experimental results show the effectiveness of the design method.
BLDC motors have been gaining attention from various industrial and household appliance manufacturers, because of its high efficiency, high power density and low maintenance cost. After many research and developments in the fields of magnetic materials and power electronics, their applications to electric drives have increased to a significant extent. In this paper, the modeling of Brushless DC motor...
Brushless DC (BLDC) motors are used in a wide variety of applications and have been well investigated in the literature. In a typical low-cost drive the voltage source inverter is controlled by the signals produced by three Hall effect sensors that are used to detect the rotor position. These sensors are supposed to be positioned exactly 120 electrical degrees apart. However, this assumption may not...
This paper presents the implementation and design of a power converter for an autonomous wind self-excited induction generator (SEIG) feeding an isolated load through the employment of a DSP-based rectifier-inverter circuit. The output voltage and frequency of the studied wind SEIG is inherently variable due to random fluctuation of wind-speed variation. A three-phase constant-voltage constant-frequency...
In this paper, an accurate position estimation method is reported for salient-pole brushless dc motor drives or permanent magnetic synchronous motor drives. The method is proposed for obtaining the position angles, the accuracy of which affect the operation of the switching devices of the inverter that drives the motor. First, the method for estimating the position angle is proposed. Secondly, the...
This paper deals with an extension of Park's transformation to model permanent magnet (PM) non- sinusoidal machines by means of the so-called pseudo-dq axes reference frame. Speed and torque vector control can then be implemented resulting in a motor drive performance close to that of sinusoidal PM machines drives. Similarly, the proposed control algorithm is derived by decomposing the machine current...
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