17-Year-Old Designed Electric Motor Without Rare-Earth Magnets
Excuse another little tangent away from the core discussion.... BUT, this is damned interesting!
"A 17-year-old [named Robert Sansone] created a prototype of a novel synchronous reluctance motor that has greater rotational force -- or torque -- and efficiency than existing ones," report via Smithsonian Magazine. "The prototype was made from 3-D printed plastic, copper wires and a steel rotor and tested using a variety of meters to measure power and a laser tachometer to determine the motor's rotational speed. His work earned him first prize, and $75,000 in winnings, at this year's Regeneron International Science and Engineering Fair (ISEF), the largest international high school STEM competition." From the report:
Quote:
The less sustainable permanent magnet motors use materials such as neodymium, samarium and dysprosium, which are in high demand because they're used in many different products, including headphones and earbuds, explains Heath Hofmann, a professor of electrical and computer engineering at the University of Michigan. Hofmann has worked extensively on electric vehicles, including consulting with Tesla to develop the control algorithms for its propulsion drive. [...] Synchronous reluctance motors don't use magnets. Instead, a steel rotor with air gaps cut into it aligns itself with the rotating magnetic field. Reluctance, or the magnetism of a material, is key to this process. As the rotor spins along with the rotating magnetic field, torque is produced. More torque is produced when the saliency ratio, or difference in magnetism between materials (in this case, the steel and the non-magnetic air gaps), is greater.
Instead of using air gaps, Sansone thought he could incorporate another magnetic field into a motor. This would increase this saliency ratio and, in turn, produce more torque. His design has other components, but he can't disclose any more details because he hopes to patent the technology in the future. [...] It took several prototypes before he could test his design. [...] Sansone tested his motor for torque and efficiency, and then reconfigured it to run as a more traditional synchronous reluctance motor for comparison. He found that his novel design exhibited 39 percent greater torque and 31 percent greater efficiency at 300 revolutions per minute (RPM). At 750 RPM, it performed at 37 percent greater efficiency. He couldn't test his prototype at higher revolutions per minute because the plastic pieces would overheat -- a lesson he learned the hard way when one of the prototypes melted on his desk, he tells Top of the Class, a podcast produced by Crimson Education. In comparison, Tesla's Model S motor can reach up to 18,000 RPM, explained the company's principal motor designer Konstantinos Laskaris in a 2016 interview with Christian Ruoff of the electric vehicles magazine Charged.
Sansone validated his results in a second experiment, in which he "isolated the theoretical principle under which the novel design creates magnetic saliency," per his project presentation. Essentially, this experiment eliminated all other variables, and confirmed that the improvements in torque and efficiency were correlated with the greater saliency ratio of his design. [...] Sansone is now working on calculations and 3-D modeling for version 16 of his motor, which he plans to build out of sturdier materials so he can test it at higher revolutions per minute. If his motor continues to perform with high speed and efficiency, he says he'll move forward with the patenting process.
and this : ETSD014 - Investigating a Novel Electric Motor Design | ISEF
These are 17 year olds. It BOGGLES my mind. Such genius.
Electricity from Solar is greater than that from coal
This is a very, very bad sign for the future availability, supply and cost of electricity in Australia Solar briefly overtakes coal in Australia as number one source of power nationally - ABC News
Until we have heaps and heaps of electricity storage -- remember that battery backup is really mostly about stabilizing the grid, Snowy 2 won't come on-line before 2027 (if that early), and the second link across Bass Strait will be even further in the future -- these sorts of relative costs imply that in a year or so most of Australia's electricity will be generated by super expensive gas
Are Electric Cars a Problem ????
I am trying to be very cautious with how I word this as I do not wish to inflame things.
I never listen to the radio - there is not one in the house and I never turn on the car radio. But a couple of weeks ago I was in a friends car and he is addicted to talk back radio (Yuk). So I was an unwilling but captive audience.
Some one was having a rant about the problems of electric cars. Most of it was the usual "we'll all be doomed" extremism, but a small part was fairly cogent, and suggested that while electric car owner's had the best motives in their choice of vehicle, that they could actually and inadvertently be exacerbating the electricity supply problems. His argument was quite simple:
- Electricity demand follows four fairly consistent bands during the day; low demand overnight, moderate demand during the day, high demand at breakfast time and peak demand at dinner time. (AEMO website verifies this.)
- Absolute peak demand occurs between 5.00 and 7.00 pm each night.
- Electric car owners leave work at 5.00 pm and drive home and immediately plug in their cars to recharge, right at the peak of the demand cycle.
- Thus they exacerbated a major existing problem.
- And those cars are fully charged well before midnight when there is excess supply.
- Only a small percentage of electric cars are charged on off-peak supplies. (I have not been able to verify this.)
He offered two solutions
- Only allow electric cars at home to recharge on off-peak tariffs so they do not exacerbate the problem. Even if you replaced his compulsion with encourage this would be beneficial.
His second solution was even better but required fairly sophisticated technology:
- Install a "super smart"(*) electricity metering system.
- At 5.00 pm he knocks off work, drives home and plugs in the car,
- The super smart meter knoows that there is high demand for electricity so it draws from the car battery into the grid - the car becomes part of the solution.
- Then, when the grid moves into a low demand period the super smart meter reverses the current flow and charges the battery - again the car is evening demand through the day.
- If he has an early start or a very high demand day ahead, then he presses the over-ride button and the super smart meter ensures the car is fully charged by, say, 6.00 am next day.
- (*) He used another phrase for "super smart" but I cannot remember it. I only half listened until I realised he was talking sense.
He also irritated the bejusus out of me because every step he was advocating he was also saying should make compulsory. Most people want to do the right thing and if that option is available and they know about it then they will adopt it. Especially with anything involving renewables - it is the driving force. Compulsion would probably be counterproductive with many people, like me.
something we could learn from
Here is a project in China that generates 910kw of solar in the desert.
Its obvious to see the difference its having on the soil and remediation.
We have a fair bit of sun and desert here.... 1+1?
https://youtu.be/qR9MLlQakK8