How can cogging torque be reduced in permanent magnet synchronous motors?

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In summary, a Tesla Model S owner named Greg Furstenwerth took on the repairs of his car himself after the warranty period expired. He found it surprisingly easy, comparing it to putting together Legos. When considering buying an electric vehicle, like a Tesla Model S or Lucid Air, it is important to consider the technology used. Lucid Motors uses a permanent magnet synchronous motor, which is different from the more conventional induction motor used by Tesla. Some innovative technology is used in the Lucid Air to reduce torque cogging. The CEO and CTO of Lucid Motors, Peter Rawlinson, is known for his work on the Tesla Model S and the Lucid Air. However, car parts, especially for electric vehicles, can
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This Tesla Model S Owner Repairs His Own Car, because after the warranty period expires, you're on your own.

Greg Furstenwerth was an early adopter of the Tesla Model S, but once the car was out of warranty he had a hard time getting the parts and service he needed. So he took on the repairs himself, and found it surprisingly easy. “If you can put together Legos you can put together a Tesla.”

When considering buying an electric vehicle, like a Tesla Model S or Lucid Air, consider the technology. Lucid uses a permanent magnet synchronous motor as compared to a more conventional induction motor. Some innovative technology reduces torque cogging


https://www.forbes.com/sites/samabu...air-will-have-517-mile-range/?sh=6740de4e4b37
https://spectrum.ieee.org/cars-that...ars/lucid-air-ev-500-miles-on-a-single-charge
https://www.motioncontroltips.com/whats-the-difference-between-cogging-torque-and-torque-ripple/

Lucid Motors CEO and CTO is Peter Rawlinson, who is known for his work as Chief Engineer on the Tesla Model S and the Lucid Air.
 
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Astronuc said:
This Tesla Model S Owner Repairs His Own Car, because after the warranty period expires, you're on your own.
Car parts are expensive. $1500 for a Tesla headlight ?:)
 
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As someone who works with vibrations in PMSMs, I was hoping for a looser-lipped explanation of their cogging torque reduction techniques...

For a given slot/pole combination, it's mostly geometric considerations.
Cogging can be reduced by:
increasing air gap
doming the poles
skewing the slots or poles
changing the slot tooth depth or opening...

All of these have their own drawbacks in efficiency and overall torque production. But none of this is proprietary information.
 

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