Optimization of electric motor for a solar airplane application
This paper presents a method to model and optimize brushless dc motor for a solar airplane. In order to obtain the optimal solution for the given specifications, all free parameters are analyzed globally in one go. For this, the commercial optimization software Pro@Design is used. The method is fully analytical and deterministic. The actual multiphysic model comprises electromagnetic, thermal, and propeller models. Different results of the design of solar airplane motor using this method are presented
Modélisation de moteurs pas à pas hybrides
These Ecole polytechnique federale de Lausanne EPFL, n° 2323 (2000)Faculte des sciences et techniques de l'ingenieurLaboratoire d'actionneurs integresJury: Hannes Bleuler, Eric Favre, Bernard Multon, Philippe Robert Public defense: 2001-2-16 Reference doi:10.5075/epfl-thesis-2323Print copy in library catalog Record created on 2005-03-16, modified on 2017-05-10
Modification of brushless DC motor back-EMF shape-application to noise reduction
The brushless DC motors are normally built with rotor mounted PMs, which create the necessary back EMF voltage to produce a mechanical power. The shape of this back-EMF voltage is very important compared to the phase voltage supply one. Indeed, the electromechanical power is obtained by the product of the back-EMF and the phase current. Two possibilities are normally used to make the choice of the electronic supply. If the back-EMF is trapezoidal, the supply will be "block" (120 degrees, two-phase one mode) in order to produce a constant torque. If the back-EMF has a sinusoidal shape, the current must also be sinusoidal. Some companies are working on new electronic drivers in order to minimise the noise created by the electronic commutation in the winding. Indeed, with the "block" current, the whole harmonic spectrum is exited and generates audible noise unsuitable for the customers. The new generation of electronic drivers uses sinusoidal shape current in order to suppress the harmonics. With trapezoidal back-EMF shape motor, the noise cannot be totally avoided. This paper presents solutions to transform the back-EMF shape in order to minimise the harmonics only by changing the PM width. The stator is not concerned