ASEE Annual Conference Quebec, Canada Booth #720 June 20-24, 2020
APPLICATION NOTE
3D SIMULATION OF AXIAL FIELD PERMANENT MAGNET COUPLING SYSTEM USING EMS AND SOLIDWORKS MOTION COUPLING
Permanent Magnet couplings (or couplers) are used to transmit torque from a primary driver to a secondary follower without any mechanical contact. Many industrial applications are based on such transmission system that doesn`t need any external electrical circuit for motors and propellers. They are especially used for high security applications and in sealed equipment for transmissions through walls.
EMS magnetostatic module is used to predict the field distribution and torque behavior versus geometrical criteria using the parametric study sweep analysis of a magnetic coupling system (Figure 1). This analysis allows to predict the effect of some of those criteria on the magnetic performance of the coupling through the run of different scenarios in a single study by varying both mechanical angle and air gap distance between the rotors.
Figure 1 - 3D design of the Axial flux magnetic coupling and schematic illustration of the alternative magnetization of PM poles.
Figures 2 and 3 display different plot types of the magnetic flux density at various mechanical angles.
Figure 2 - Vector plot of the magnetic flux density at the angles 0 and 15 degrees.
Figure 3 - Fringe plot of the magnetic flux density at the angles 0 and 15 degrees.
Figures 4 and 5 show a comparison of experimental, analytical and EMS results of z-component of the magnetic field in the air gap and the rotor torque, respectively.
Figure 4 - Flux density Bz versus radial coordinate
Figure 5 - Torque results versus angular .
EMS couples both electromagnetic fields and mechanical analysis. Using SOLIDWORKS motion and EMS, angular speed and displacement are computed and illustrated in Figure 6a). The oscillations waveform of the rotating torque is shown in Figure 6b).
Figure 6 - a)- Angular speed and displacement versus time b)-Torques results versus time
SCIENCE NEWS
People can sense Earth’s magnetic field, brain waves suggest
A new study hints that humans have magnetoreception abilities, similar to some other animals
A new analysis of people’s brain waves when surrounded by different magnetic fields suggests that people have a “sixth sense” for magnetism.
Birds, fish and some other creatures can sense Earth’s magnetic field and use it for navigation (SN: 6/14/14, p. 10). Scientists have long wondered whether humans, too, boast this kind of magnetoreception. Now, by exposing people to an Earth-strength magnetic field pointed in different directions in the lab, researchers from the United States and Japan have discovered distinct brain wave patterns that occur in response to rotating the field in a certain way.
