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This paper presents a novel axial doubly salient electro-magnetic machine with a new double sets of stator structure based on the traditional permanent magnet brushless DC motor and the switched reluctance motor. A new external control circuit is designed according to the special structure and working mechanism of the motor. And according to the electromagnetic characteristics in different conditions...
This paper proposes a robust time-series feature extraction of the currents for permanent magnet (PM) defect classification in brushless DC (bLDC) motors. Thanks to the six-step operation of the BLDC motors, current waveform can be precisely represented by its extrema without loss of too much information, resulting in more computational benefits and less required memory. Effect of PM demagnetization...
The development of electric vehicle is now growing rapidly. Demands to deliver a reliable and easy to drive in motor control causes Brushless Direct Current (BLDC) motor becomes a potential candidate. A BLDC motor drive is a potential option for an electric vehicle since it has a high reliability, simple design, and ability to work at high rotation per minute (RPM). This paper discussed the Permanent...
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...
The method of functions of line by line flux for estimating rotor position in sensorless BLDC drive is presented in this paper. This method has appropriate eificiency over a wide range of speed and it estimates the rotor position independent from speed and rotor frequency. Two techniques of DTC and SWF are used to design the sensorless BLDC motor drive. Finally, simulation results show that the DTC...
In this paper, by analyzing the relationship between rotor position and phase back electromotive forces (PB-EMFs) of brushless DC motor (BLDCM), a novel rotor position detection method based on morphological filter algorithm (MFA) for BLDCM is proposed. MFA is applied to identify the signal turning points (STPs) of the input stator PB-EMFs, which provides technical support for the current commutations...
PMBLDC motors are nowadays use widely for many applications such as industrial application, aerospace, electric vehicles, medical etc. The reason for it is their high torque/speed ratio. But even though with these advantage it face problem of harmonic distortion. This paper particularly deals with operating behavior of PMBLDC motor and harmonic produced in it; by using MATLAB/SIMULINK software.
In this paper, a pure torque loop control method without flux linkage observer and a modified double closed loop control method with a couple of derived simple equations for the control of the stator flux linkage amplitude were proposed for direct torque control (DTC) of brushless DC motor (BLDCM), using a 2-phase conduction mode. The objectives of the novel control strategies are trying to simplify...
In this paper, the permanent magnet motor without shoes of stator teeth was designed. In case of a shoeless motor, it is very easy to manufacture a stator with coil windings. It has, however, high cogging torque and torque ripples generally. The proposed model in this paper was designed considering cogging torque characteristic. The finite element analysis was performed to evaluate the effect of reducing...
Recently our Honourable Prime Minister Mr. Narendra Modi has announced a scheme for villagers related to irrigation purpose. Under this scheme solar powered dc motor will be used for running pumps in farms financed by Government of India. In this context an effort is made to design light weight magnetically levitated solar powered dc machine which can work at same time as motor and generator. The...
BLDC motors and their drives are gaining attention day by day from various industrial and household appliance manufactures because of its high efficiency, high power density, high torque, and low inertia, less noise, compact form, almost no maintenance, salient operation, and reliability. The BLDC motor can also be thought of an intermediate between a DC motor and a synchronous motor, which extracts...
In this paper, a direct-drive spherical motor to produce two-degree of freedom rotations has been proposed. The structure and prototype of the motor are given and the basic principles are described, including the operation principle and mathematic theories, etc. Importantly, the two air gaps between the mover and the rotor, the mover and the stator that mainly determine the performance of the motor...
Due to the simple and robust structure, cost-effective SRM has attracted much attentions. For the applications to Electric vehicles (EVs), in-wheel motor whose configuration has an inner stator and outer rotor. The arrangement can eliminate transmission loss greatly. This paper mainly focuses on the torque characteristics analysis for the in-wheel SRM. Through torque performance comparison among three-phase...
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,...
Recent years, the development of the More Electric Aircraft is becoming more popular, the power supply system of 270 VDC is one of the important development trend. More electric-hydraulic components such as EMP and EHA driven by 270 VDC have shown more advantage compared to the components with the traditional electric power supply 115 VAC, which have been applied successfully in modern aircrafts,...
The AHU (air handler unit) is one of the main research objects in HVAC (heating, ventilating and air conditioning) system containing coils, blower wheel, heater, etc. Most of the high efficiency blower wheels are driven by BLDC (brushless DC) motor. This paper mainly focuses on two severe problems in blower wheel, namely airflow blockage and unbalanced load of fan motor. Early diagnosis of these problems...
A new structure for a rotary - linear Switched Reluctance Motor (RL-SRM) is presented in this paper. It has been mainly designed to engage and disengage a rotating gear. The motor is comprised of a three-phase 6/4 rotary SRM and a two-phase transverse flux linear SRM. The linear phases are placed at the sides of the rotary section to create forward-backward motion. The motor design is performed based...
With regard to small DC brushless motors the problem of the cogging torques amplitude is considered. At the aim a special motor prototype, obtained by the substitution of the original ferrite magnets with bonded magnets prepared in the own laboratories, has been realized; such a prototype assumes the role of "reference motor" as regards some quantities introduced as "quality factors"...
This paper proposes the design method on the notch structure of stator tooth to reduce the cogging torque of the single-phase brushless Direct Current (BLDC) Motor. The single phase BLDC motors generates the dead-point causing a starting failure. This problem is solved by using an asymmetric air-gap structure. However, the asymmetric air-gap structure increases the cogging torque causing a noise and...
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