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Discussion Starter · #4 ·
From most efficient to least, here’s how the five motor technologies stack up: salient-pole PM, nonsalient PM, synchronous-reluctance, switched-reluctance and, last but not least, induction motors. Regarding power and torque density, as may be expected, the rankings mirror those for efficiency, with the PM designs having the highest torque density and induction designs the least.

 

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Discussion Starter · #15 · (Edited)
PMSM has distributed windings but Synchronous Reluctance motors have a different rotor which can substitute the permanent magnets for iron, and some including the model 3 have embedded magnets (hallbach arrays) in the iron.



synchronous reluctance iron rotor:



bldc permanent magnet rotor:



model 3 rotor with internal halbach arrays:
 

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Discussion Starter · #19 · (Edited)
exterior rotor (outrunner) motors have higher torque density and efficiency compared to interior rotor (inrunner) motors...


139089
 

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Discussion Starter · #21 · (Edited)
So, as the man says, they are better at powering robots.

Not much relevance to EVs there.
well, the implication is an outrunner style surface permanent magnet motor can have better performance and efficiency than a interior permanent magnet synchronous reluctance inrunner style motor of the same mass - presumably since you’d be replacing the iron in the IpmSynRM rotor with more copper in the windings and more permanent magnets, and the rotor will have a larger outer diameter (without increasing the overall motor diameter) for more leverage...
 

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Discussion Starter · #22 ·
there seems to be considerable room for improvement, likely not only in motor efficiency but also torque density...
139111

139112


^the tesla seems to be doing more poorly efficiency wise with high torque at low speed...
 
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