larsb
1 MW
The figures you have are unrealistic. 50turns in a winding with 200A capability won’t be likely to happen in a motor size that is found here on ES. More like 10 turns 400A max
This paper is a good read, 100deg C, all d-axis current: https://www.researchgate.net/profile/Yuriy_Zhilichev2/publication/224360700_Analysis_of_Permanent_Magnet_Demagnetization_Accounting_for_Minor_B-H_Curves/links/56ed554608ae4b8b5e73fe5b/Analysis-of-Permanent-Magnet-Demagnetization-Accounting-for-Minor-B-H-Curves.pdf
2% is lost in this example but at a really high temperature, 100 degrees in the magnets could damage them without outside field and the glue on surface mount magnets would be so soft that they might fly :wink:
Interesting that the d-axis is considered to be worst case as that is the field weakening axis so field weakening makes a difference, not only due to lower efficiency/higher temperature.
This paper is a good read, 100deg C, all d-axis current: https://www.researchgate.net/profile/Yuriy_Zhilichev2/publication/224360700_Analysis_of_Permanent_Magnet_Demagnetization_Accounting_for_Minor_B-H_Curves/links/56ed554608ae4b8b5e73fe5b/Analysis-of-Permanent-Magnet-Demagnetization-Accounting-for-Minor-B-H-Curves.pdf
2% is lost in this example but at a really high temperature, 100 degrees in the magnets could damage them without outside field and the glue on surface mount magnets would be so soft that they might fly :wink:
Interesting that the d-axis is considered to be worst case as that is the field weakening axis so field weakening makes a difference, not only due to lower efficiency/higher temperature.