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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...
An isolated Zeta converter is proposed as a power factor correction (PFC) converter with DC link voltage control for speed control of a permanent magnet brushless DC motor (PMBLDCM). The voltage source inverter (VSI) is used as an electronic commutator of PMBLDCM. The proposed converter performs the PFC action and DC link voltage control in single stage using only one controller. The current multiplier...
This paper presents a single ended primary inductor converter (SEPIC) as a power factor correction (PFC) converter which is operated in voltage control mode for the speed control of a permanent magnet brushless DC motor (PMBLDCM) driven air-conditioner (Air-Con). The proposed converter combines the PFC and DC link voltage control in single stage and uses only one controller. The PFC controller uses...
This paper deals with a Cuk DC-DC converter as a single-stage power factor correction (PFC) converter for a permanent magnet brushless DC motor (PMBLDCM) fed through a diode bridge rectifier (DBR) from a single-phase AC mains. A three-phase voltage source inverter is used as an electronic commutator to operate the PMBLDCM driving an air conditioner compressor. The speed of the compressor is controlled...
In this paper, a buck half-bridge DC-DC converter is used as a single-stage power factor correction (PFC) converter for feeding a voltage source inverter (VSI) based permanent magnet brushless DC motor (PMBLDCM) drive. The front end of this PFC converter is a diode bridge rectifier (DBR) fed from single-phase AC mains. The PMBLDCM is used to drive a compressor load of an air conditioner through a...
The paper is devoted to motors static and dynamic qualitative characteristics required to compare and select brushless DC torque motors of different models and manufacturers for control systems and servo drives. By analyzing of 16 torque motors from 6 manufacturers it is shown that the most informative energetic index is the static torque quality factor measuring a developing torque per units of consumer...
This paper describes the reduction in torque ripple due to phase commutation of brushless dc motors. With two-phase 120deg electrical conduction for the inverter connected to the conventional three-phase BLDC machine, the commutation torque ripple occurs at every 60 electrical degrees when a change over from one phase to another occurs. This effect increases the commutation time at higher speeds which...
Permanent magnet brushless dc (BLDC) motor drives are widely used in high performance applications where torque smoothness is essential. In this paper, the reduction in commutation torque ripple due to phase commutation of brushless dc motor is described. In a conventional three-phase BLDC machine with two-phase 120deg electrical conduction, commutation torque ripple, which occurs at every 60deg electrical...
Brushless DC (BLDC) Drives find immense applications in various control systems, especially in position control. Such applications require fast dynamic response with excellent stability and steady state performance. In order to meet this requirement, brushless dc drives should respond with improved performance. In this paper, a typical brushless dc motor drive system used for control applications...
This paper proposes a model of brushless dc motor drive considering behaviour of the motor during commutation and waveform of backemf, for dynamic simulation of Electromechanical Actuator (EMA) under MATLAB/Simulink environment. Ideally trapezoidal backemf is considered in simulations for BLDC motor, which gives a constant torque. Practically, torque ripple exist, mainly due to emf waveform imperfections,...
In this study, six kinds of the drivetrain systems of electric motor drives for EVs are discussed. Furthermore, the requirements of EVs on electric motor drives are presented. The comparative investigation on the efficiency, weight, cost, cooling, maximum speed, and fault-tolerance, safety, and reliability is carried out for switched reluctance motor, induction motor, permanent magnet blushless DC...
Brushless DC (BLDC) motor drives are continually gaining popularity in motion control applications. Therefore, it is necessary to have a low cost, but effective BLDC motor speed/torque regulator. This paper introduces a novel concept for digital control of trapezoidal BLDC motors. The digital controller was implemented via two different methods, namely conduction-angle control and current-mode control...
This paper presents a comprehensive analysis on torque ripples of brushless dc motor drives in conduction region and commutation region. A novel method for reducing the torque ripple in brushless dc motors with a single current sensor has been proposed by adding BUCK converter in the front of 3-phase inverter. In such drives, torque ripple suppression technique is theoretically effective in commutation...
In this article, a comparison is made between two brushless DC motors of the same rating, one is designed with a segmented permanent magnet (PM) poles whereas the other with one segment of permanent magnet poles. Both drives are aimed for traction applications. The drives performances are assessed using a coupled model which considers the motor and controller configuration. A special emphasis is made...
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