Electronic Commutator Method for Determining E° of Formation of Fused Halides

1961 ◽  
Vol 108 (11) ◽  
pp. 1059 ◽  
Author(s):  
Anthony F. Wilde ◽  
Ralph L. Seifert
Keyword(s):  
Electronic Commutator ◽  
Commutator Method

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

scholarly journals Mourre theory for time-periodic systems

1998 ◽  
Vol 149 ◽  
pp. 193-210 ◽  
Author(s):  
Koichiro Yokoyama
Keyword(s):  
Asymptotic Behavior ◽  
Adjoint Operator ◽  
The Self ◽  
Periodic Systems ◽  
Great Progress ◽  
Time Periodic ◽  
Commutator Method

Abstract.Studies for A.C. Stark Hamiltonian are closely related to that for the self-adjoint operator on torus. In this paper we use Mourre’s commutator method, which makes great progress for the study of time-independent Hamiltonian. By use of it we show the asymptotic behavior of the unitary propagator as σ → ± ∞.

Application of the commutator method for boson mapping

1989 ◽  
Vol 221 (2) ◽  
pp. 103-108 ◽  
Author(s):  
Débora Peres Menezes ◽  
Naotaka Yoshinaga ◽  
Dennis Bonatsos
Keyword(s):  
Commutator Method

Calculated self-energy contributions for annsvalence electron using the multiple-commutator method

1999 ◽  
Vol 59 (4) ◽  
pp. 2707-2711 ◽  
Author(s):  
Leonti Labzowsky ◽  
Igor Goidenko ◽  
Maria Tokman ◽  
Pekka Pyykkö
Keyword(s):  
Self Energy ◽  
Commutator Method

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.

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