Tier One automotive supplier Mahle has developed an electric motor for EVs that uses no permanent magnets. It is not the first to do so, but it is the first to create a motor that is scalable to fit the needs of many sizes of vehicles, from subcompact cars to medium duty trucks. Mahle says the ability to tune and change the parameters of the rotor’s magnetism instead of being stuck with what a permanent magnet offers has allowed its engineers to achieve efficiencies above 95% right through the range of operating speeds. Only the motors used in Formula E cars offer such efficiency, according to New Atlas.
As a result, there’s practically nothing to wear out, says IEEE Spectrum. “There are no contacts to transmit electricity, no abrasion, no dust formation, no mechanical wear,” Berger, said Wednesday during an online press conference. He adds that the new motor combines the best points of several motor designs by offering good efficiency at both low and high torque.
See https://cleantechnica.com/2021/05/17/mahle-develops-magnet-free-motor-for-electric-vehicles/
#technology #environment #EV
That’s honestly surprising, since the three phase induction motor (the one I mentioned) was one of the first mass market electric motors, invented independently by Nikola Tesla and Galileo Ferraris. All that’s needed to run them is for an inverter to generate 3-phase power, and the speed is controlled by varying the frequency.
IIRC they’re pretty standard on electric trains.
OK but what exactly is unbelievable as they never claimed to invent this - they have developed the first one in electric cars where everyone else has been using magnets? Something was not obvious though otherwise everyone would have done it without the rare earth magnets.