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Direct torque control method for BLDC motor drives usually represents reduction in high ripples in the torque. The important characteristics observed in DTC is non-linear regulation of stator flux and torque within variables structure by hysteresis band controller. For particular sampling period Ts values of torque and flux are chosen for Hysteresis band. This would help to achieve average sampling...
Binary speed control combined with the current limit (hysteresis) control is a low cost method of brushless DC motor speed control. Although it is desirable that the entire speed torque characteristic of the mechanical load is determined experimentally. However, in the absence of the actual load, motor and the sufficient hardware; the parameters of a standard motor are used in simulation. Also a flexible...
The recent activity of the authors, concerning different types of small PM machines, brought to the necessity to measure the respective cogging torques. Normally such a measure (including the hysteresis and bearing torque components), is realized with a prime motor to drag the machine under exam at very low speed and adopting a very good gearbox (classical method). During the activity a new method...
This paper proposes a maximum efficiency control method in 7-phase brushless DC motors (7-phase BLDCMs) used for the ship propulsion system. In the same load condition, the system loss of the 7-phase BLDCM is dependent on the number of the excited windings and the instantaneous phase currents. Thus, it is necessary to determine the excitation number of the phase windings according to the load condition...
Brushless DC motors (BLDCM) are most popular because of their higher efficiency, less maintenance and precise control characteristics. However, this motor has nonlinear nature and can be affected easily by the parameter change and disruption. For any automobile and industrial applications, it is essential to govern the speed accurately. Because of their fixed gain values, high peak overshoot and high...
In future Electric vehicles (EV) are trend setters for transportation with zero greenhouse gas emission and higher efficiency. In EV applications, Brushless DC motors (BLDCM) are most predominantly used. Here, a Hybrid Fuzzy PI controller is intended for effective speed regulation of BLDCM. In general, Fuzzy logic controllers (FLC) provide better transient performance and results steady state error...
Brushless DC (BLDC) motor control system is a multi-parameter nonlinear systems, and the ultra-low inductance of it makes more stringent requirements on the performance of the control system, which make it difficult using the traditional PI control method and the intelligent control methods, such as fuzzy control method and neural network control method, to effectively control a low-inductance BLDC...
Due to significant increase in the demand of electric motors, design and manufacturing of high efficiency motors and related variable speed drives has been a major interest by many suppliers. Brushless DC (BLDC) motor has many advantages including high torque capability. In this paper, the possibilities of direct power control (DPC) of BLDC motors fed by voltage source inverter have been studied....
In this paper, a novel current controlled space-vector pulse width modulation (CCSVPWM) technique for reducing torque ripple in a three-level neutral-point-clamped (NPC) inverter fed trapezoidal brushless direct current (BLDC) motor is proposed. In BLDC motor, the different current slew rates between switching-in and switching-out phase generate current ripple, further leading to the generation of...
Direct Torque Control (DTC) is a method to control the torque in variable frequency drives. This paper describes sensorless DTC of brushless dc (BLDC) motor drive operating in constant torque region under two phase conduction mode to get instantaneous torque control. Sliding Mode Observer (SMO) which is low sensitive to parameter variation is proposed to estimate the phase-to-phase trapezoidal back-EMF...
This paper presents a method for sensorless rotor position detection of BLDC drive based on Back EMF which is indirectly obtained from motor terminal voltages along with PWM switching noise. Low pass filter is used to eliminate high frequency noise. The low pass filter used in position detection circuit also produces phase lag on back EMF signal which deteriorates the accuracy. This phase lag problem...
Permanent Magnet Brushless DC (PMBLDC) machines are more popular due its simple structure and low cost. Improvements in permanent magnetic materials and power electronic devices have resulted in reliable, cost effective PMBLDC drives, for many applications. Modelling, simulation and experimentation of drives with new converter configuration and control schemes are essential for making this drive competitive...
In order to improve the speed precision and stabilization of the gimbal servo system of double gimbal magnetically suspended control moment gyro, a comprehensive analysis of the reason of electromagnetic torque ripples of brushless direct current motor with nonideal back electromotive force (EMF) drives in the conduction and commutation regions is presented. A novel automatic control method of torque...
Permanent Magnet Brushless DC (PMBLDC) machines are more popular due to its simple structure and low cost. Improvements in permanent magnetic materials and power electronic devices have resulted in reliable, cost effective PMBLDC drives, for many applications. PMBL motors find applications in diverse fields such as domestic appliances and automobiles due to its low cost and performance. Modelling,...
The aim of the paper is to present a method for evaluating brushless DC motors (BLDC) for fixed wing Unmanned Aerial Vehicles (UAVs). Selection of a BLDC motor, which operates in its efficient region for a UAV platform's specifications, will affect the endurance capabilities of the UAV platform. A four-constant model is presented as a means of modelling and predicting the characteristics of BLDC motors...
The brushless dc motor has a permanent-magnet rotor, and the stator windings are wound such that the back electro motive force(EMF) is trapezoidal. The paper develops a phase variable model of the BDCM and uses it to examine the performance of a BDCM speed servo drive system when fed by hysteresis and pulse width modulated (PWM) current controllers. Particular attention is paid to the motor torque...
This paper presents a direct torque control technique for brushless DC motors with non-sinusoidal back electromotive force. Direct torque control has some benefits such as faster torque response and reduced torque ripple for driving the brushless DC motors. In order to solve the problems associated with conventional PI speed controller, a speed control based on fuzzy logic controller is proposed to...
To improve the efficiency of HDD spindle motor, reducing air gap length (AGL) and raising magnetic energy product (MEP) of magnetic material are considered to be efficient methods. However some disadvantages are introduced concomitantly, such as the increase of cogging torque (CT) and unbalanced magnetic pull (UMP). This paper investigates both positive and negative effects of reduction of AGL and...
This paper describes a novel operation performance of a brushless DC motor (BLDC), fed by a Hybrid Distributed Generation System (HDGS). The HDGS is accompanied with photovoltaic (PV) array, fuel cell stacks and a battery to supply a fixed power for driving a BLDC motor. The HDGS employs a novel multi-input DC boost converter for utilizing DG sources in a unified structure. In this structure each...
Cost minimizing of the electrical machine drives is more attractive for low cost applications. The low cost BLDC driver is achieved by the reduction of switch device, cost down of control, and saving of hall and current sensors. In this paper, a simple position sensorless control strategy for four-switch three-phase BLDC motor drives using single current sensor is proposed. The whole working process...
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