An interior permanent magnet synchronous reluctance motor is more efficient than an induction motor but is it also more efficient than BLDC permanent magnet motors (of similar size)?
A quick Google returns:
"There is no major difference in motor
control systems of BLDC and PMSM Motors
; except the nature of the Drive Current and
the detection of the Rotor Position. One of the advantages of PMSM motor
is the absence of Torque ripple, which makes these motors
more efficient than BLDC
"In a PMSM
, the windings are distributed over several poles, so producing a voltage waveform that's more more sinusoidal. These differences mean that BLDC motors
are slightly cheaper to produce, but may be slightly less efficient, noisier and
have more cogging
, than PMSMs."