That is comparing apples and pears. Yes they are a electrical motor. The stepping motor in your hard drive is a PMM that has iron in its core so it steps. The motor in a wind turbine is a PMM with out the iron. So the last two if you compare on same scale will have a other weight and power.
a induction motor has a coil on the rotor that makes its magnetic field based on that it needs more energy. A PMM can easy be used as a generator or as a brake.
The different technology has different applications.
