safe
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Where did you pull up the field weakining idea on the hallbach? They are synchronous motors.
This was answered once already a few posts back...
http://www.motoredbikes.com/showpost.php?p=242423&postcount=12
Yes, from a "peak efficiency" and "peak power" perspective the Halbach does NOT offer much. I've seen all the disappointment on the RC forums about the Halbach not delivering any "more" than before.
The big advantage is the powerband width. (and that's my goal... not "peak" which is limited by the law)
So for ebikes that are "legal" this is of value, but for RC motors it's not.
This is actually an area where what is good for RC is bad for ebikes.
But don't take my word for it... this is the actual torque curve of a Halbach motor:
...while the Halbach is in fact synchronous it demonstrates "AC Induction motor-like" behavior.
The Halbach is everything you would want in an AC Induction motor, but without the "slip".
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