April 2020 Newsletter

EMWorks Newsletter 2020

Announcement COVID-19

WEBINARS

Powerful Tools for Modeling Electromechanical Actuators for SOLIDWORKS Users

Thursday, April 2, 2020
02:00 PM EST

Modeling of Magnetic Gear inside SOLIDWORKS

Thursday, April 23, 2020
02:00 PM EST

APPLICATION NOTE
LOSS ANALYSIS OF A DOUBLE-SIDED PERMANENT MAGNET (DSPM) RADIAL-FLUX EDDY CURRENT COUPLER
Eddy current coupler is a non-contact coupling system that works on the Eddy current principle, where a circular electrical current is induced within a conductor by a nearby varying magnetic field. This induced current creates a magnetic field that opposes the magnetic field source (created by winding or PM). Those forces ensure torque transmission between two rotating mechanical systems without any concrete contact. The current study is investigating the radial type of Eddy current coupler for a Double-Sided Permanent Magnet (DSPM) configuration. Figures 1a) and 1b) show respectively real and 3D CAD SOLIDWORKS models of the studied eddy current coupler.
(a) (b) Figure 1 - Eddy current coupler, a) real model, b) 3D CAD model
EMS transient magnetic solver was coupled to SOLIDWORKS Motion and this simulation was used to predict the torque and the eddy losses quantities when an angular speed of 800 rpm is applied to the PM rotors for a simulation time of 75 ms. The transient magnetic simulation with eddy current analysis is shown next. Figure 2 illustrates the magnetic flux in the studied coupler.
Figure 2 - Magnetic flux density
The first 2D plot (Figure 3a) shows the constant angular velocity of the PM rotors which has a value of 4800 Deg/s. Eddy currents generated in the metallic tube will create an electromagnetic torque acting in the reverse direction of the moving PM. The next 2D plot (Figure 3b) contains the induced torque results versus time which has an average value around 58.5E-3 N.m.
(a)	(b)
Figure 3 - Electromechanical results, a) angular velocity of the rotor, b) torque results of the conductor

SCIENCE NEWS
Electric cars should be the norm in the post-coronavirus world
According to Jonathan & Ilona Jaspers (2007) (Air Pollution and Respiratory Viral Infection, Inhalation Toxicology) there is a very clear link between those pollutants and the increase of contagion and infection by more than 200 types of viruses, including coronaviruses. As about 65% of the world’s population live in cities and a major contributor to the outdoor air pollution in urban areas are trucks and cars with internal combustion engines (ICE). One solution is electric mobility. Electric cars produce zero local emissions. The total greenhouse effect (global warming gases) varies depending of the mixture of the power grid of each country and are very debatable depending the metric used, but emissions are not. Even biofuels or e-fuels produce a similar amount of pollutants. Internal combustion engines in cities cannot coexist with clean air.	By Lucas Di Grassi
The coronavirus is showing us how clean the air can be if electric cars were the norm
With all the loss of lives and financial destruction that the coronavirus has brought us, it’s hard to look at silver linings from this crisis, but there’s one that’s becoming obvious: cleaner air. It might not last for long, but it’s giving us a glimpse at what we could experience if the world was to rapidly transition to electric transportation. With shelter-in-place and stay-at-home orders all over the world, passenger car traffic has been way down and people have been burning way less petrol. A map of nitrogen dioxide captured from satellite images. it shows a massive reduction compared to just two months ago: Source (Earther)