[lj516]

I bet they are switched reluctance. They haven't been possible until recently because of the switching and calcs needed for the micro. Alts use a field with a claw tooth rotor to provide an alternating field and are VERY rpm limited, let alone 70% efficient...

 

[lj516]

The simplest reason from a DIY perspective is that magnet motors are virtually impossible to disassemble safely without a very strong jig

Not true