Efficiency and power losses in PM BLDC motor with variable bridge/half-bridge structure electronic commutator

2008 ◽  
Author(s):  
K. Krykowski ◽  
A. Bodora
Keyword(s):  
Bridge Structure ◽  
Bldc Motor ◽  
Power Losses ◽  
Electronic Commutator

scholarly journals Constant Current Models of Brushless DC Motor

2013 ◽  
Vol 3 (1) ◽  
pp. 19-24 ◽  
Author(s):  
Krzysztof Krykowski ◽  
Janusz Hetmańczyk
Keyword(s):  
Current Model ◽  
Dc Motor ◽  
Constant Current ◽  
Brushless Dc Motor ◽  
Bldc Motor ◽  
Modified Model ◽  
Brushless Dc ◽  
Mathematical Equations ◽  
The Impact ◽  
Electronic Commutator

Abstract Two constant current models of Permanent Magnet Brushless Direct Current Motor (PM BLDC) are presented in the paper. In the first part of the paper principle of operation, basic properties and mathematical equations describing PM BLDC models are given. Then, two different constant current models of PM BLDC motor are considered: In the first model, PM BLDC motor is approximated with dc motor; in the second model, modified constant current model is applied with additional block, which is used to take into account the impact of inductance on torque-speed characteristics. In order to verify these models, torque-speed characteristics have been determined and compared for different motor supply voltages. After running a series of simulation and laboratory tests, we have found that this modified model (which makes allowance for the influence of inductance on torque-speed characteristics) ensures obtaining torque-speed characteristics identical to those of the real motor. Therefore, this model may be recommended for those simulation tests which do not consider effects occurring inside the electronic commutator-motor circuit. However, approximation of PM BLDC motor with dc motor is not recommended in computer tests.

A reconfigurable structure electronic commutator for a dual BLDC motor EV drive

2012 ◽  
Vol 60 (4) ◽  
pp. 769-778
Author(s):  
T. Biskup ◽  
A. Bodora ◽  
A. Domoracki
Keyword(s):  
Control System ◽  
Electric Vehicle ◽  
Motor Drives ◽  
Bldc Motor ◽  
Motor Speed ◽  
Common Control ◽  
Speed Range ◽  
Constant Power Speed Range ◽  
Reconfigurable Structure ◽  
Electronic Commutator

Abstract An electronic commutator that can drive a PM BLDC motor either in the full bridge or half bridge configuration has been developed. This commutator allows increasing the motor speed over the nominal value, hence the motor is able to operate within a wide constant power speed range. An application of the commutator with a reconfigurable structure for the double drive of a small electric vehicle Elipsa has been presented. The driveline consists of two independent commutators feeding the motors coupled by gears with rear wheels of the vehicle. Both commutators are controlled by a common control system based on a signal microcontroller. The results of road tests indicate new areas of BLCD motor drives application. The fact that the BLCD motor work in the second speed range does not require any changes in the motor construction and at the same time does not significantly deteriorate the drive efficiency is an indisputable advantage of the presented solution

Recovery braking of variable-structure electronic commutator for BLDC motor

2012 ◽  
Vol 61 (4) ◽  
pp. 579-596
Author(s):  
Tomasz Biskup
Keyword(s):  
Theoretical Analysis ◽  
Electric Vehicle ◽  
High Efficiency ◽  
Variable Structure ◽  
Bldc Motor ◽  
Simple Construction ◽  
Permanent Magnet Motors ◽  
High Torque ◽  
Electronic Commutator ◽  
Standard Range

Abstract Permanent magnet motors are more and more frequently used in various applications. In this group motors with a trapezoidal EMF deserve a special attention. They are characterized by a simple construction, high efficiency and high torque overload. A certain drawback of BLDC motors are difficulties with an operation at a speed above the nominal value. The article presents the results of investigations into the variablestructure electronic commutator designed for the drive of a small electric vehicle equipped with BLDC motors. Such a solution allows extending the standard range of the drive’s speed. The considerations contained in the article focus on the possibilities and effects of regeneration mode in the proposed topology of converter. A theoretical analysis has been presented as well as computer simulations carried out by means of Matlab- Simulink, which were then verified at a laboratory. The tests were finished with trials conducted using a small electric vehicle Elipsa.

scholarly journals Design and Fabrication of Electric Vehicle for Physically Challenged Person

2019 ◽  
Vol 8 (10) ◽  
pp. 4297-4300
Keyword(s):  
Electric Vehicle ◽  
Control Unit ◽  
Bldc Motor ◽  
Fuel Cost ◽  
Mechanical Structure ◽  
Current Scenario ◽  
Physically Challenged ◽  
Electronic Commutator

This article studies on a design and fabrication of Electric Vehicle (EV) for physically challenged person. In current scenario, a physically challenged person has facing a problem of transportation during their travel from one place to another place without safety and convenience. They find it difficult to react to situation in front of them. In order to solve these problems, an Electric Vehicle (EV) is designed where they can travel easily and safely. The major components of EV consist of battery, electronic commutator with control unit, BLDC motor and mechanical structure. The main merits of developed EV has no pollution, no fuel cost, less weight, modified mechanical structure, high pulling capacity, comfortable spacing for person travel, easy maintenance, less number components in comparison with existing EV. The gross weight of designed vehicle with load (person) has 300 kg (approximately). The performance of the developed EV is validated at different running conditions for monitoring the battery back-up and time durations.

scholarly journals Modified Mechanical Structure Electric Bike Design Computation and Prototype Model Implementation

2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
K. Ramash Kumar ◽  
T. S. Anandhi ◽  
B. Vijayakrishna ◽  
Monalisa Mohanty ◽  
M. Siva Ramkumar ◽  
...  
Keyword(s):  
Electric Vehicles ◽  
Electrical Energy ◽  
Operating Conditions ◽  
Prototype Model ◽  
Bldc Motor ◽  
Mechanical Structure ◽  
Design Computation ◽  
Electric Bike ◽  
Electronic Commutator ◽  
Design Estimate

The aim of this paper is to investigate the design computation and prototype model implementation of a Modified Mechanical Structure (MMS) Electric Bike (E-Bike). It is the technology that allows the vehicle to operate with the assistance of electrical energy. All conventional cars will be converted to electric vehicles (EVs) in the future. EVs will be affordable to all types of people, allowing them to fly comfortably and safely. As a result, this paper proposes a design estimate and model implementation of the MMS E-Bike with the smallest number of parts, lowest expense, and lightest weight possible. The most important parts of the designed MMS E-Bike are the battery, MMS, BLDC motor, and electronic commutator with their controller. Because of its adapted mechanical frame nature, the designed E-Bike is low in cost and weight, and it can also go up to 25 kmph. Furthermore, the rider will be able to ride the built MMS E-Bike without any pain to their bodies and should be able to sit comfortably during their journey. In comparison to the Ampere Angel and DMW Electra 20 E-Bikes, the performance of the developed model is tested under various operating conditions, as well as their battery backup.

Spectroscopic Diagnostics of Tokamaks

1988 ◽  
Vol 102 ◽  
pp. 165-174
Author(s):  
C. de Michelis
Keyword(s):  
Transport Properties ◽  
Power Losses ◽  
Spectroscopic Diagnostics ◽  
Important Concern

AbstractImpurities being an important concern in tokamaks, spectroscopy plays a key role in their understanding. Techniques for the evaluation of concentrations, power losses and transport properties are surveyed, and a few developments are outlined.

Power Losses in RF Inductor of Ferrite-Free Closed-Loop Inductively-Coupled Low Pressure Mercury Lamps

2020 ◽  
pp. 89-94 ◽  
Author(s):  
Ekaterina V. Lovlya ◽  
Oleg A. Popov
Keyword(s):  
Closed Loop ◽  
Low Pressure ◽  
Mercury Vapour ◽  
Plasma Power ◽  
Power Losses ◽  
Inductive Discharge ◽  
Inductively Coupled ◽  
Radial Inhomogeneity ◽  
Transformer Model ◽  
Rf Inductor

RF inductor power losses of ferrite-free electrode-less low pressure mercury inductively-coupled discharges excited in closed-loop dielectric tube were studied. The modelling was made within the framework of low pressure inductive discharge transformer model for discharge lamps with tubes of 16, 25 and 38 mm inner diam. filled with the mixture of mercury vapour (7.5×10–3 mm Hg) and argon (0.1, 0.3 and 1.0 mm Hg) at RF frequencies of 1, 7; 3.4 and 5.1 MHz and plasma power of (25–500) W. Discharges were excited with the help of the induction coil of 3, 4 and 6 turns placed along the inner perimeter of the closed-loop tube. It was found that the dependence of coil power losses, Pcoil, on the discharge plasma power, Ppl, had the minimum while Pcoil decreased with RF frequency, tube diameter and coil number of turns. The modelling results were found in good qualitative agreement with the experimental data; quantitative discrepancies are believed to be due skin-effect and RF electric field radial inhomogeneity that were not included in discharge modelling.

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